1. The utility model provides a rotary kiln is smelted in laterite-nickel ore reduction of foldable hookup, includes the rotary kiln body (1), its characterized in that, the rotary kiln body (1) has the multistage, and first section rotary kiln body (1) head end is provided with kiln hood cover (2), be provided with kiln hood combustor (3) on kiln hood cover (2), the end of last section rotary kiln body (1) is provided with kiln tail exhaust petticoat pipe (4), be provided with material charge door (5) on kiln tail exhaust petticoat pipe (4), link together through hookup room (6) between the head and the tail of two sections adjacent rotary kiln bodies (1), all be provided with rotary kiln riding wheel (8) and rotary kiln on every section rotary kiln body (1) and rotate power system (7).

2. The folding type connected laterite-nickel ore reduction smelting rotary kiln according to claim 1, is characterized in that: the rotary kiln is in a U-shaped structure formed by connecting two sections of rotary kiln bodies (1) end to end.

3. The folding type connected laterite-nickel ore reduction smelting rotary kiln according to claim 1, is characterized in that: the rotary kiln is in an S-shaped structure formed by connecting three sections of rotary kiln bodies (1) end to end.

4. The folding type connected laterite-nickel ore reduction smelting rotary kiln according to claim 1, is characterized in that: and a negative pressure smoke dust returning system (9) is communicated between the rotary kiln body (1) and the connecting chamber (6).

5. The folding type connected laterite-nickel ore reduction smelting rotary kiln according to claim 1, is characterized in that: and a connecting chamber auxiliary interface (10) is arranged on the connecting chamber (6).

6. The folding type connected laterite-nickel ore reduction smelting rotary kiln according to claim 1, is characterized in that: and a material chute and an anti-blocking device are arranged in the connecting chamber (6).

7. The folding type connected laterite-nickel ore reduction smelting rotary kiln according to claim 1, is characterized in that: the rotary kiln body (1) comprises a steel shell, and refractory materials are built in the steel shell.

Background

The rotary kiln is a thermal equipment for heating and treating bulk or slurry materials, and is widely applied to industrial departments of nonferrous metallurgy, ferrous metallurgy, refractory materials, cement, chemical industry and the like. The cylinder is internally provided with a refractory brick lining and a heat exchange device which rotate at a low speed. The material and hot flue gas are generally subjected to countercurrent heat exchange, and the material is added from the high end of the kiln (also called the cold end or the tail end of the kiln). Because the cylinder is installed obliquely, when the kiln rotates, the materials in the kiln roll along the circumferential direction and move along the axial direction. The burner injects fuel at the low end (also called hot end or kiln head end) for combustion, and the flue gas is discharged from the high end. The material is heated in the moving process and becomes qualified material through physical and chemical changes, and the qualified material is discharged from the low end. The whole process is that the material ore sand is from top to bottom, and the heat of the flue gas is from bottom to top, so that heat exchange is formed.

In recent years, the application of rotary kilns is gradually extended to the fields of metallurgy, solid waste treatment and the like besides the traditional cement industry. The metallurgy field mainly uses a rotary kiln as three fields of drying wet ores, pre-reducing and roasting ore sands and directly reducing and smelting ore sands. The temperature of the kiln head of the rotary kiln for drying is generally 500-600 ℃, the temperature of the kiln head of the rotary kiln for pre-reduction roasting is generally 800-1000 ℃, and the temperature of the kiln head of the direct reduction smelting rotary kiln is generally 1000-1200 ℃. Particularly, in the technical field of RKEF (rotary kiln electric furnace) in the metallurgical industry, the rotary kiln is gradually enlarged in the original field of pre-reduction roasting of laterite-nickel ore, for example, the diameter of the rotary kiln exceeds 5 meters, the length of the rotary kiln exceeds 100 meters in the newly built RKEF project, and the rotary kiln has a larger and longer possibility in the future.

Because the rotary kiln for pre-reduction roasting and direct reduction smelting of the laterite-nickel ore is too long in length, the following 3 main problems can be caused: 1. the single kiln head burner has high power, which causes the difficulty in manufacturing the burner, low combustion efficiency and overlarge investment of a combustion system; 2. the kiln body is too long, the floor area is too large, and a plurality of factories are arranged to form a long and thin cloth belt, so that land acquisition, planning, operation and the like are inconvenient; 3. the kiln body is too long, so that the heat at the tail of the kiln is insufficient, the temperature of the kiln head is too high, and the material is stuck and hung on the refractory material at the kiln head of the rotary kiln at the bottom after being melted, thereby greatly reducing the operating rate of the rotary kiln.

Disclosure of Invention

The invention aims to provide a folding type connected laterite-nickel ore reduction smelting rotary kiln, which solves the problems in the background technology.

The technical scheme adopted by the invention is as follows:

the utility model provides a rotary kiln is smelted in laterite-nickel ore deposit reduction of foldable hookup, includes the rotary kiln body 1, the rotary kiln body 1 has the multistage, and first section rotary kiln body 1 head end is provided with kiln hood cover 2, be provided with kiln head combustor 3 on the kiln hood cover 2, the end of last section rotary kiln body 1 is provided with kiln tail exhaust petticoat pipe 4, be provided with material charge door 5 on the kiln tail exhaust petticoat pipe 4, link together through hookup room 6 between the head and the tail of two sections adjacent rotary kiln bodies 1, all be provided with rotary kiln riding wheel 8 and rotary kiln on every section rotary kiln body 1 and rotate power system 7.

The rotary kiln is in a U-shaped structure formed by connecting two sections of rotary kiln bodies 1 end to end.

The rotary kiln is in an S-shaped structure formed by connecting three sections of rotary kiln bodies 1 end to end.

And a negative pressure smoke dust returning system 9 is communicated between the rotary kiln body 1 and the connecting chamber 6.

The connection chamber 6 is provided with a connection chamber auxiliary interface 10.

And a material chute and an anti-blocking device are arranged in the connecting chamber 6.

The rotary kiln body 1 comprises a steel shell, and refractory materials are built in the steel shell.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

the folding type connected laterite-nickel ore reduction smelting rotary kiln and the connection chamber thereof disclosed by the invention have the advantages of reasonable structural design, small occupied area, less investment and high heat energy utilization rate, and compared with the traditional integrated rotary kiln smelting process, the folding type connected laterite-nickel ore reduction smelting rotary kiln effectively solves the problems that the rotary kiln body is too long and the occupied area is too large, a single burner combustion system has more problems, and the front section temperature is too high, so that the refractory material of the rotary kiln body is stuck and hung on the material, and meanwhile, the whole roasting or metallurgy process is better regulated and controlled, the production efficiency is improved, the economic benefit is better, the large-scale production can be realized, and the folding type connected laterite-nickel ore reduction smelting rotary kiln and the connection chamber thereof are a breakthrough design scheme in the field of rotary kiln metallurgy at present.

The method promotes the development of more derivative technologies in the field of laterite-nickel ore reduction smelting, for example, the problems of kiln head overburning and kiln sticking in the direct reduction technology and the waste heat utilization of the RKEF process can be well solved, and the method has good market prospect in the field of laterite-nickel ore reduction smelting.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

shown in the figure: a rotary kiln body 1; a kiln head cover 2; a kiln head burner 3; a kiln tail exhaust hood 4; a material feeding port 5; a coupling chamber 6; a rotary power system 7 of the rotary kiln; a rotary kiln riding wheel 8; the negative pressure smoke dust returns to the kiln system 9; a coupling chamber auxiliary interface 10.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments and accompanying drawings further illustrate the present invention in detail.

Example 1

As shown in fig. 1, the embodiment provides a folding-type connected laterite-nickel ore reduction smelting rotary kiln, which comprises two sections of rotary kiln bodies 1, wherein the rotary kiln is formed by connecting the two sections of rotary kiln bodies 1 end to form a U-shaped structure, a kiln head cover 2 is arranged at the head end of the first section of rotary kiln body 1, a kiln head burner 3 is arranged on the kiln head cover 2, a kiln tail exhaust hood 4 is arranged at the tail end of the last section of rotary kiln body 1, a material charging opening 5 is arranged on the kiln tail exhaust hood 4, the ends and the tails of two adjacent rotary kiln bodies 1 are connected together through a connecting chamber 6, and a rotary kiln riding wheel 8 and a rotary kiln rotation power system 7 are arranged on each section of rotary kiln body 1.

A negative pressure smoke dust returning system 9 is connected between the rotary kiln body 1 and the connecting chamber 6, and the negative pressure smoke dust returning system 9 is a negative pressure fan. A connection chamber auxiliary connection 10 is provided on the connection chamber 6. A material chute and an anti-blocking device are arranged in the connecting chamber 6. The rotary kiln body 1 comprises a steel shell, and refractory materials are built in the steel shell.

In the embodiment, the rotary kiln bodies connected together through the connecting chamber can rotate, the connecting chamber is fixed and rectangular in structure, and the connected rotary kiln barrel extends into the connecting chamber by 10-20 cm. Because the negative pressure fan is arranged at the tail of the uppermost rotary kiln to achieve the purpose of heat exchange, all the rotary kiln bodies and the connecting chambers which are connected are in a negative pressure environment, smoke cannot emerge from the joint of the rotary kiln and the connecting chamber under the general condition, but in order to reduce the air leakage, a small negative pressure fan is arranged in the embodiment to collect smoke and dust in the protective cover between the rotary cylinder and the gap of the connecting chamber and circulate to the connecting chamber for utilization.

In the embodiment, the ore sand material slides into the rotary kiln from top to bottom by the gravity in the connecting chamber through a special wear-resistant and high-temperature-resistant chute.

In the embodiment, when the rotary kiln is used, the burner at the kiln head of the lowest rotary kiln provides main heat, and the kiln tail of the uppermost rotary kiln provides ore sand and semi-coke reducing agent, but if the temperature of the kiln tail is insufficient, a small burner can be arranged at the connecting chamber to provide heat required by the rear-section rotary kiln.

In the embodiment, under the condition that the lowest burner has too high temperature, so that the ore sand has too high melting degree and is stuck on nearby refractory materials to cause blocking accidents, the heat supply of the lowest kiln head burner is reduced in advance, and the small burner arranged at the connecting chamber supplies heat to provide heat required by the rear-section rotary kiln.

In this embodiment, when the temperature of the rotary kiln above the connection chamber is too high, the tuyere connection is opened, and cold air is added in a natural air suction or blowing manner to reduce the temperature in the rotary kiln above.

In the embodiment, under the condition that the rotary kiln reducing agent below the connecting chamber is insufficient, the semi-coke or anthracite reducing agent is added from the interface, so that the requirements of the rotary kiln below are met. And adding other auxiliary materials required by roasting or smelting, such as a small amount of limestone, magnesia and high-temperature anticoagulant, at the joint of the coupling chamber.

In this embodiment, the diameter and length of each section of kiln body are adjusted correspondingly, taking ferronickel smelting in the RKEF rotary kiln-submerged arc furnace as an example. The phenomenon of insufficient pre-reduction of the mineral aggregate occurs in the production process, so that more electric energy is consumed in the later smelting process of the electric furnace. The rotary kiln at the bottom designed by the embodiment is properly increased in cylinder diameter and made of special refractory materials, so that the heating area and the heating time of internal materials in a high-temperature section are increased, the reduction is more sufficient, and better economic benefit is brought to the whole smelting process.

The invention is different from ore sand which separately works by using a plurality of rotary kilns, and can ensure that the waste heat of the lower rotary kiln enters the upper rotary kiln to continuously exchange heat with cold materials, thereby achieving the purpose of directly utilizing the waste heat; meanwhile, the thermal material enters the lower rotary kiln from the upper rotary kiln in a thermal mode, and is further heated in a state of no heat loss, so that the aims of energy conservation and high efficiency are fulfilled.

Example 2

Referring to fig. 2, the difference between the present embodiment and embodiment 1 is that the present embodiment includes three sections of rotary kiln bodies 1, and the rotary kiln is formed in an S-shaped structure by connecting the three sections of rotary kiln bodies 1 end to end.

The above description is only exemplary of the invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.