1. A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

the method comprises the steps of putting gold copper concentrate containing 1.5% -2.0% of arsenic into a side-blown smelting furnace, blowing oxygen-enriched air into the furnace to perform a physical and chemical reaction with mixed furnace materials at a high temperature of 1200-1300 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, sending the arsenic into the flue gas in a arsenic trioxide gaseous state, and sending the flue gas into a quenching arsenic-collecting system after waste heat recovery and electric dust recovery of the flue gas; spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, wherein the oxygen absorbent is added according to 0.3-1.0 time of the residual oxygen content of the flue gas;

the method is characterized in that: the oxygen absorbent is prepared by the following method:

according to the mass portion, uniformly mixing 120 portions of red mud of 100-35 portions, coal powder of 20-35 portions, sulfide of 2-6 portions and limestone of 10-18 portions, then projecting into a smelting furnace, making the smelted sulfur-containing molten iron contact with carbon monoxide gas in a countercurrent manner at 1250 ℃ with the carbon monoxide gas pressure of 14-18MPa to prepare the mixed gas of carbonyl iron and carbon monoxide, cooling to 70-120 ℃ after the completion, separating out the carbonyl iron, separating the carbon monoxide gas, adding the obtained carbonyl iron into 1500 portions of 0.5-5% by mass of methanol solution of sulfhydryl modifier of 1000-containing materials, then adding 4.5-9.5 portions of copper acrylate and 2.2-3.6 portions of sodium methoxide, slowly adding into a reaction kettle, heating to 48-55 ℃, stirring for reaction for 300min, then filtering, drying to obtain the oxygen absorbent;

a quenching arsenic-collecting system:

the effective height of the quenching tower is 20-25m, the absorption liquid adopts water, the water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, the water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to below 170 ℃, arsenic trioxide is separated out from a gaseous state to be changed into a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

2. The method for cleaning, smelting and controlling arsenic of the arsenic-containing gold-copper concentrate according to claim 1, wherein the method comprises the following steps: the residual oxygen content of the flue gas is 1.5-3.5%.

3. The method for cleaning, smelting and controlling arsenic of the arsenic-containing gold-copper concentrate according to claim 1, wherein the method comprises the following steps: and the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

4. The method for cleaning, smelting and controlling arsenic of the arsenic-containing gold-copper concentrate according to claim 1, wherein the method comprises the following steps: the sulfide is sodium sulfide or ammonium sulfide.

5. The method for cleaning, smelting and controlling arsenic of the arsenic-containing gold-copper concentrate according to claim 1, wherein the method comprises the following steps: the sulfur content in the sulfur-containing molten iron is 1-5%.

6. The method for cleaning, smelting and controlling arsenic of the arsenic-containing gold-copper concentrate according to claim 1, wherein the method comprises the following steps: the concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system is 0.05-0.1%.

Background

At present, most of arsenic-containing gold copper concentrates are treated by adopting a roasting furnace or an oxygen-enriched bottom blowing furnace, roasting slag obtained by treating the arsenic-containing gold copper concentrates by using the roasting furnace needs cyaniding leaching, a large amount of cyaniding tailings are generated, and the subsequent treatment is difficult and seriously pollutes the environment. The oxygen-enriched bottom blowing furnace is used for treating arsenic-containing gold-copper concentrate, gold, silver and copper are fully recovered, arsenic enters flue gas in an As2O3 gaseous form, and the arsenic can be discharged only when proper treatment is required.

CN201511006863.0 discloses an arsenic recovery process for sulfur trioxide-containing smelting flue gas, wherein an alkaline absorbent (sodium hydroxide, sodium carbonate and sodium bisulfite) is adopted to cool the flue gas, and the use of the alkaline absorbent causes the collected arsenic ash to contain sodium salt, thereby reducing the grade of arsenic trioxide and ensuring lower purity.

CN104451167A relates to a method for treating arsenic in high-arsenic material smelting flue gas, which comprises the following steps: (1) cooling high-arsenic material smelting smoke to be lower than 380 ℃, collecting dust, quenching and cooling the smoke to 125-145 ℃ to obtain low-grade arsenic-containing smoke dust, collecting the dust of the cooled smoke to obtain low-grade arsenic dust, and mixing the low-grade arsenic-containing smoke dust and the low-grade arsenic dust to obtain coarse arsenic dust; (2) re-heating the crude arsenic dust to 600-700 ℃, so that arsenic in the crude arsenic dust is converted from a solid state to a gaseous state, and high-grade arsenic flue gas is generated; (3) cooling the high-grade arsenic flue gas to below 120 ℃ to obtain solid arsenic dust, and collecting the cooled flue gas to obtain the high-grade arsenic dust. The process can improve the recovery amount of arsenic to the maximum extent, improve the grade of arsenic dust, recover residual valuable metals after dearsenization from high-arsenic polymetallic materials and improve the hidden danger of environmental pollution caused by slag material stockpiling or abandoning.

CN110433607A provides a device capable of removing dust and collecting arsenic from nonferrous smelting flue gas, the device comprises a fan, a dust-removing and arsenic-separating integrated device and a quenching and arsenic-collecting device which are sequentially communicated, wherein a rotary table connected with a driving device through a transmission shaft is arranged in the dust-removing and arsenic-separating integrated device, the rotary table is provided with a through hole used for passing through smoke, the rotary table is provided with an intercepting pipe used for adsorbing smoke dust and a partition plate used for dividing the arsenic-separating and arsenic-separating device into a dust-separating area, an arsenic-separating area and a blowing area, the upper end and the lower end of the dust-separating area, the upper end and the lower end of the arsenic-separating area and the blowing area are respectively provided with a through hole, the lower end through hole of the dust-separating area is connected with the fan, the upper end through hole of the dust-separating area is connected with an upper communication hole of the arsenic-separating area, the lower end through hole of the arsenic-separating area is connected with a smoke outlet, the arsenic-separating area is also connected with a cooling device, and the upper end through hole of the arsenic-separating area is connected with the quenching and arsenic-collecting device. The invention can realize the operation of dust removal and arsenic separation on one device, not only simplifies the flue gas treatment process, but also improves the purity of the recovered finished arsenic.

In the prior art and the treatment process of the patents, because a large amount of SO3 gas is generated under the oxygen-enriched condition, the existing quenching arsenic-recovering process is adopted, the smoke gas contains high sulfur trioxide in the quenching process, the SO3 dew point temperature in the smoke gas is low, and the condensation generates dilute acid, SO that the smoke gas and the dilute acid are bonded in subsequent equipment, and the As2O3 in the smoke gas cannot be effectively recovered. In addition, sodium salt is introduced into the adopted absorbent, and the obtained arsenic trioxide has low purity.

Disclosure of Invention

In order to solve the problems, the invention provides a method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate.

A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

the method comprises the steps of putting gold copper concentrate containing 1.5% -2.0% of arsenic into a side-blown smelting furnace, blowing oxygen-enriched air into the furnace to perform a physical and chemical reaction with mixed furnace materials at a high temperature of 1200-1300 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, sending the arsenic into the flue gas in a arsenic trioxide gaseous state, and sending the flue gas into a quenching arsenic-collecting system after waste heat recovery and electric dust recovery of the flue gas; spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, wherein the oxygen absorbent is added according to 0.3-1.0 time of the residual oxygen content of the flue gas; the oxygen absorbent is prepared by the following method:

according to the mass portion, uniformly mixing 120 portions of red mud of 100-35 portions, coal powder of 20-35 portions, sulfide of 2-6 portions and limestone of 10-18 portions, then projecting into a smelting furnace, making the smelted sulfur-containing molten iron contact with carbon monoxide gas in a countercurrent manner at 1250 ℃ with the carbon monoxide gas pressure of 14-18MPa to prepare the mixed gas of carbonyl iron and carbon monoxide, cooling to 70-120 ℃ after the completion, separating out the carbonyl iron, separating the carbon monoxide gas, adding the obtained carbonyl iron into 1500 portions of 0.5-5% by mass of methanol solution of sulfhydryl modifier of 1000-containing materials, then adding 4.5-9.5 portions of copper acrylate and 2.2-3.6 portions of sodium methoxide, slowly adding into a reaction kettle, heating to 48-55 ℃, stirring for reaction for 300min, then filtering, drying to obtain the oxygen absorbent.

A quenching arsenic-collecting system:

the effective height of the quenching tower is 20-25m, the absorption liquid adopts water, the water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, the water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to below 170 ℃, arsenic trioxide is separated out from a gaseous state to be changed into a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

The reaction mechanism of the oxygen absorbent is as follows: carbonyl iron and mercaptosilane generate hydroxyl iron with mercapto, and the hydroxyl iron and copper acrylate generate Michael addition reaction,

the residual oxygen content of the flue gas is 1.5-3.5%.

And the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

The sulfide is sodium sulfide or ammonium sulfide.

The sulfur content in the sulfur-containing molten iron is 1-5%.

The concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system is 0.05-0.1%.

The invention discloses a method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate, which has the following beneficial effects:

1. carbonyl iron is prepared by using cheap raw materials such as red mud, the carbonyl iron and mercaptosilane generate hydroxyl iron with mercapto, and the hydroxyl iron and copper acrylate generate Michael addition reaction to generate an oxygen absorbent; the use of the oxygen absorbent reduces the residual oxygen content in the flue gas from 1.5-3.5% to 0.5-1.5%;

2. spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, further reducing the content of sulfur trioxide in the flue gas from 0.2-0.3% to 0.05-0.1%, increasing the dew point of SO3 in the flue gas and preventing equipment corrosion;

3. the absorbent of the quenching arsenic-collecting system adopts water, so that the grade of the arsenic trioxide is improved, and the purity of the arsenic trioxide reaches more than 95 percent;

4. after the crude arsenic is processed by a steel belt furnace, more than 99.5 percent of refined arsenic trioxide is obtained.

Detailed Description

The invention is further illustrated by the following specific examples:

example 1

A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

putting gold copper concentrate containing 1.5% of arsenic into a side-blown smelting furnace, performing a physical and chemical reaction on oxygen-enriched air blown into the furnace and mixed furnace materials at a high temperature of 1200 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, enabling the arsenic to enter the flue gas in a gaseous state of arsenic trioxide, and enabling the flue gas to enter a quenching arsenic collecting system after waste heat recovery and electric dust recovery of the flue gas; spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, wherein the oxygen absorbent is added according to 0.3 time of the residual oxygen content of the flue gas; the oxygen absorbent is prepared by the following method:

uniformly mixing 100 parts of red mud, 20 parts of coal powder, 2 parts of sulfide and 10 parts of limestone in parts by mass, then extruding into a smelting furnace, carrying out countercurrent contact on molten iron containing sulfur obtained after smelting at 1150 ℃ with carbon monoxide gas under the pressure of 14MPa to prepare mixed gas of carbonyl iron and carbon monoxide, cooling to 70 ℃ after the completion, precipitating the carbonyl iron, separating the carbon monoxide gas, adding the obtained carbonyl iron into 1000 parts of 0.5% by mass methanol solution of a mercapto modifier, then adding 4.5 parts of copper acrylate and 2.2 parts of sodium methoxide, slowly adding the mixture into a reaction kettle, heating to 48 ℃, stirring for reaction for 100min, filtering, and drying to obtain the oxygen absorbent.

A quenching arsenic-collecting system:

the effective height of the quenching tower is 20m, water is adopted as absorption liquid, water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to be below 170 ℃, arsenic trioxide is separated out from a gaseous state to be a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

The residual oxygen content of the flue gas is 1.5 percent.

And the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

The sulfide is sodium sulfide.

The sulfur content in the sulfur-containing molten iron is 1 percent.

The concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system is 0.05%.

Example 2

A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

putting gold copper concentrate containing 1.8% of arsenic into a side-blown smelting furnace, performing a physical and chemical reaction on oxygen-enriched air blown into the furnace and mixed furnace charge at the high temperature of 1250 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, enabling the arsenic to enter the flue gas in a gaseous state of arsenic trioxide, and enabling the flue gas to enter a quenching arsenic collecting system after waste heat recovery and electric dust recovery of the flue gas; spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, wherein the oxygen absorbent is added according to 0.6 time of the residual oxygen content of the flue gas; the oxygen absorbent is prepared by the following method:

according to the mass portion, 110 portions of red mud, 25 portions of coal powder, 5 portions of sulfide and 12 portions of limestone are uniformly mixed and then are put into a smelting furnace, molten iron containing sulfur obtained after smelting is in countercurrent contact with carbon monoxide gas at 1180 ℃, the pressure of the carbon monoxide gas is 16MPa, mixed gas of carbonyl iron and carbon monoxide is prepared, after the mixed gas is finished, the temperature is reduced to 90 ℃, carbonyl iron is separated out, the carbon monoxide gas is separated, the obtained carbonyl iron is added into 1200 portions of 3% by mass of methanol solution of a mercapto modifier, 6.5 portions of copper acrylate and 2.9 portions of sodium methoxide are added into a reaction kettle slowly, the temperature is raised to 51 ℃, and after stirring reaction is carried out for 200min, filtration and drying are carried out, thus obtaining the oxygen absorbent.

A quenching arsenic-collecting system:

the effective height of the quenching tower is 22m, water is adopted as absorption liquid, water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to be below 170 ℃, arsenic trioxide is separated out from a gaseous state to be a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

The residual oxygen content of the flue gas is 2.5 percent.

And the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

The sulfide is ammonium sulfide.

The sulfur content in the sulfur-containing molten iron is 2.5 percent.

The concentration of sulfur trioxide in the flue gas entering the quick cooling arsenic collecting system is 0.08%.

Example 3

A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

putting gold copper concentrate containing 2.0% of arsenic into a side-blown smelting furnace, performing a physical and chemical reaction on oxygen-enriched air blown into the furnace and mixed furnace materials at the high temperature of 1300 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, enabling the arsenic to enter the flue gas in a gaseous state of arsenic trioxide, and enabling the flue gas to enter a quenching arsenic collecting system after waste heat recovery and electric dust recovery of the flue gas; spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, wherein the oxygen absorbent is added according to 1.0 time of the residual oxygen content of the flue gas; the oxygen absorbent is prepared by the following method:

uniformly mixing 120 parts of red mud, 35 parts of coal powder, 6 parts of sulfide and 18 parts of limestone in parts by mass, then extruding into a smelting furnace, carrying out countercurrent contact on molten iron containing sulfur obtained after smelting at 1250 ℃ and carbon monoxide gas under the pressure of 18MPa to prepare mixed gas of carbonyl iron and carbon monoxide, cooling to 120 ℃ after finishing the reaction, separating out the carbonyl iron, separating the carbon monoxide gas, adding the obtained carbonyl iron into 1500 parts of 5% methanol solution of a mercapto modifier in parts by mass, then adding 9.5 parts of copper acrylate and 3.6 parts of sodium methoxide, slowly adding the mixture into a reaction kettle, heating to 55 ℃, stirring for reaction for 300min, filtering, and drying to obtain the oxygen absorbent.

A quenching arsenic-collecting system:

the effective height of the quenching tower is 25m, water is adopted as absorption liquid, water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to be below 170 ℃, arsenic trioxide is separated out from a gaseous state to be a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

The residual oxygen content of the flue gas is 3.5 percent.

And the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

The sulfide is sodium sulfide.

The sulfur content in the sulfur-containing molten iron is 5 percent.

The concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system is 0.1%.

The method for measuring the concentration of SO3 in the flue gas is adopted in GB/T21508-2008 appendix C to measure the concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system, and the purity of arsenic trioxide is measured according to the method of SN/T0837.1-1999.

The results of the sulfur trioxide concentration and arsenic trioxide purity tests in the flue gas of the above examples are shown in the following table:

	concentration of Sulfur trioxide (%)	Purity of arsenic trioxide (%)
			Example 1	0.1	99.58
Example 2	0.07	99.63
			Example 3	0.05	99.69

Comparative example 1

A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

putting gold copper concentrate containing 1.5% of arsenic into a side-blown smelting furnace, performing a physical and chemical reaction on oxygen-enriched air blown into the furnace and mixed furnace materials at a high temperature of 1200 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, enabling the arsenic to enter the flue gas in a gaseous state of arsenic trioxide, and enabling the flue gas to enter a quenching arsenic collecting system after waste heat recovery and electric dust recovery of the flue gas; spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, wherein the oxygen absorbent is added according to 0.3 time of the residual oxygen content of the flue gas; the oxygen absorbent is pyrite powder;

a quenching arsenic-collecting system:

the effective height of the quenching tower is 20m, water is adopted as absorption liquid, water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to be below 170 ℃, arsenic trioxide is separated out from a gaseous state to be a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

The residual oxygen content of the flue gas is 1.5 percent.

And the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

The sulfide is sodium sulfide.

The sulfur content in the sulfur-containing molten iron is 1 percent.

The concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system is 0.05%.

Comparative example 2

A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

putting gold copper concentrate containing 1.5% of arsenic into a side-blown smelting furnace, performing a physical and chemical reaction on oxygen-enriched air blown into the furnace and mixed furnace materials at a high temperature of 1200 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, enabling the arsenic to enter the flue gas in a gaseous state of arsenic trioxide, and enabling the flue gas to enter a quenching arsenic collecting system after waste heat recovery and electric dust recovery of the flue gas;

a quenching arsenic-collecting system:

the effective height of the quenching tower is 20m, water is adopted as absorption liquid, water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to be below 170 ℃, arsenic trioxide is separated out from a gaseous state to be a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

The residual oxygen content of the flue gas is 1.5 percent.

And the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

The sulfide is sodium sulfide.

The sulfur content in the sulfur-containing molten iron is 1 percent.

The concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system is 0.05%.

Comparative example 3

A method for controlling arsenic in clean smelting of arsenic-containing gold copper concentrate comprises the following steps: the system comprises a side-blown smelting system, a side-blown arsenic collecting system and a steel strip furnace refining system;

side-blown smelting system:

putting gold copper concentrate containing 1.5% of arsenic into a side-blown smelting furnace, performing a physical and chemical reaction on oxygen-enriched air blown into the furnace and mixed furnace materials at a high temperature of 1200 ℃ to generate liquid copper matte, furnace slag and flue gas, sending the copper matte into a converting furnace, sending the furnace slag into a slag slow cooling field for cooling, then sending the furnace slag for ore dressing, enabling the arsenic to enter the flue gas in a gaseous state of arsenic trioxide, and enabling the flue gas to enter a quenching arsenic collecting system after waste heat recovery and electric dust recovery of the flue gas; spraying an oxygen absorbent into an ascending flue of the side-blown converter to reduce the content of oxygen in the flue gas, wherein the oxygen absorbent is added according to 0.3 time of the residual oxygen content of the flue gas; the oxygen absorbent is prepared by the following method:

uniformly mixing 100kg of red mud, 20kg of coal powder and 10kg of limestone, then, extruding the mixture into a smelting furnace, carrying out countercurrent contact on molten iron obtained after smelting and carbon monoxide gas at 1150 ℃, wherein the pressure of the carbon monoxide gas is 14MPa, preparing and obtaining mixed gas of carbonyl iron and carbon monoxide, cooling to 70 ℃ after the completion, separating out the carbonyl iron, separating the carbon monoxide gas, and uniformly mixing the obtained carbonyl iron and 500kg of pyrite powder to obtain the oxygen absorbent;

a quenching arsenic-collecting system:

the effective height of the quenching tower is 20m, water is adopted as absorption liquid, water and compressed air are atomized and sprayed into the tower through a spray head at the top of the quenching tower, the absorption liquid is fully contacted with smelting flue gas entering from the bottom of the quenching tower in the tower, water is evaporated, a large amount of heat is taken away, the temperature of the flue gas is suddenly reduced to be below 170 ℃, arsenic trioxide is separated out from a gaseous state to be a solid state and is taken to a settling chamber and a bag-type dust collector along with the flue gas, and the arsenic trioxide with the purity of more than 95 percent is obtained;

steel band stove refining system:

the crude arsenic containing 95 percent of arsenic trioxide continuously enters a steel strip furnace from a steel strip, and sequentially passes through a heating zone, an evaporation zone and an air extraction zone, the arsenic trioxide is pumped into a cooling settling tank in the air extraction zone in a gaseous form, and is cooled and settled in the settling tank, so that more than 99.5 percent of arsenic trioxide is obtained.

The residual oxygen content of the flue gas is 1.5 percent.

And the flue gas enters an acid making system after coming out of the quick-cooling arsenic-collecting system.

The sulfide is sodium sulfide.

The sulfur content in the sulfur-containing molten iron is 1 percent.

The concentration of sulfur trioxide in the flue gas entering the quick-cooling arsenic-collecting system is 0.05%.

The results of the sulfur trioxide concentration and arsenic trioxide purity tests in the flue gas of the above comparative examples are shown in the following table:

	concentration of Sulfur trioxide (%)	Purity of arsenic trioxide (%)
			Comparative example 1	0.19	99.08
Comparative example 2	0.28	98.67
			Comparative example 3	0.14	99.24