1. A production method for accelerating the capture of carbon dioxide products by nanofiltration seawater is characterized by comprising the following steps:

step one, settling the product wastewater containing the carbon dioxide captured by the nanofiltration seawater, and specifically comprising the following steps: adding sodium carbonate or potassium carbonate to adjust the pH value of the wastewater to 7-9, continuously adding 0.05-2% of basic polyaluminum chloride by mass fraction, 0.5-100 ppm of Anionic Polyacrylamide (APAM) by mass fraction and 0.05-0.1% of sodium methylenedinaphthalene sulfonate (NNO) by mass fraction based on the treated product wastewater until large flocculent calcium carbonate and magnesium carbonate are formed in the product wastewater containing the carbon dioxide captured by the nanofiltration seawater, reducing the temperature of the product wastewater to 5-10 ℃, accelerating the sedimentation of the calcium carbonate and the magnesium carbonate, discharging the waste water of the precipitated calcium carbonate and the magnesium carbonate into a concentration tank through a pipeline, and drying the calcium carbonate and the magnesium carbonate by a filter press to obtain blocky calcium carbonate and magnesium carbonate;

step two, dicing: mechanically cutting the blocky calcium carbonate and magnesium carbonate obtained in the step one, and crushing the blocky calcium carbonate and magnesium carbonate into small blocky magnesium carbonate and calcium carbonate by adopting a crusher;

step three, drying: and (4) conveying the small blocky magnesium carbonate and calcium carbonate obtained in the step two to a thermal infrared drying heating cavity through a material conveying system for thermal infrared drying and drying treatment, so as to obtain nanofiltration seawater capture carbon dioxide products calcium carbonate and magnesium carbonate.

2. The method for accelerating the production of carbon dioxide product captured by nanofiltration seawater according to claim 1, wherein the molecular weight of the Anionic Polyacrylamide (APAM) in the first step is 1000-1800 ten thousand.

3. The production method for accelerating the capture of the carbon dioxide product by the nanofiltration seawater as claimed in claim 1, wherein the retention time of the small-sized magnesium carbonate and the calcium carbonate in the third step in the thermal infrared drying and heating chamber is 0.1h-0.5h, and the water content of the magnesium carbonate and the calcium carbonate obtained by drying is 0.5% -5%.

Background

Coal is the main reason for carbon dioxide emission in China, and the contribution rate reaches 73%. Data in 2018: china discharges 100 million tons of carbon dioxide, coal contributes 73 million tons, petroleum contributes 15 million tons, cement contributes 7 million tons, and natural gas contributes 5 million tons.

The control of greenhouse gases is the key development and development direction of future Chinese development, the novel CCUS (carbon capture, utilization and sequestration) technology can effectively solve the problem, high-concentration calcium and magnesium ions in seawater are utilized to capture carbon dioxide in flue gas, calcium carbonate, magnesium carbonate and the like are obtained, and the recovered calcium carbonate and magnesium carbonate are used as important components of recovered resources to realize carbon dioxide capture and resource utilization.

How to realize the recycling of carbon dioxide recovery products is urgently needed to solve the problems that the dry water content of the products for capturing carbon dioxide by the traditional treatment process is too high, so that the transportation is difficult and the transportation cost is high; and the technical has more difficulty in practical application because the cement cake is difficult to disperse and the field operation is supported by mechanical equipment. In order to reduce the stacking area and facilitate transportation, products for capturing carbon dioxide are often required to be dried before leaving a factory, conventional drying equipment is a hollow blade drying machine, stirring paddles are usually arranged in the drying equipment, wet materials are in contact with a heat carrier to remove free water in the wet materials under the stirring of the blades, the drying method has two defects, the first defect is that the materials often have a large amount of dust under the stirring of the blades, the operation environment is relatively severe, and the second defect is that the moisture content of the dried materials is still high and is between 20% and 40%.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a production method for accelerating the capture of a carbon dioxide product by nanofiltration seawater.

A production method for accelerating the capture of carbon dioxide products by nanofiltration seawater is characterized by comprising the following steps:

step one, settling the product wastewater containing the carbon dioxide captured by the nanofiltration seawater, and specifically comprising the following steps: adding sodium carbonate or potassium carbonate to adjust the pH value of the wastewater to 7-9, continuously adding 0.05-2% of basic polyaluminum chloride by mass fraction, 0.5-100 ppm of Anionic Polyacrylamide (APAM) by mass fraction and 0.05-0.1% of sodium methylenedinaphthalene sulfonate (NNO) by mass fraction based on the treated product wastewater until large flocculent calcium carbonate and magnesium carbonate are formed in the product wastewater containing the carbon dioxide captured by the nanofiltration seawater, reducing the temperature of the product wastewater to 5-10 ℃, accelerating the sedimentation of the calcium carbonate and the magnesium carbonate, discharging the waste water of the precipitated calcium carbonate and the magnesium carbonate into a concentration tank through a pipeline, and drying the calcium carbonate and the magnesium carbonate by a filter press to obtain blocky calcium carbonate and magnesium carbonate;

step two, dicing: mechanically cutting the blocky calcium carbonate and magnesium carbonate obtained in the step one, and crushing the blocky calcium carbonate and magnesium carbonate into small blocky magnesium carbonate and calcium carbonate by adopting a crusher;

step three, drying: and (4) conveying the small blocky magnesium carbonate and calcium carbonate obtained in the step two to a thermal infrared drying heating cavity through a material conveying system for thermal infrared drying and drying treatment, so as to obtain nanofiltration seawater capture carbon dioxide products calcium carbonate and magnesium carbonate.

The molecular weight of the Anionic Polyacrylamide (APAM) in the first step is 1000-1800 ten thousand.

In the third step, the small-sized magnesium carbonate and calcium carbonate blocks stay in the thermal infrared drying heating cavity for 0.1-0.5 h, and the water content of the magnesium carbonate and the calcium carbonate obtained by drying is 0.5-5%.

Due to the adoption of the technical scheme, the invention has the following advantages:

1. the nanofiltration seawater obtained by the invention collects the products of carbon dioxide, namely calcium carbonate and magnesium carbonate, and the detection and analysis show that the water content of the products is low, and the continuous production is realized, so that the drying energy consumption of the products is low;

2. due to the introduction of the organic high-molecular polyacrylamide, a net structure is formed, and the particle dust is fixed, so that no dust is generated in the drying process. Meanwhile, the NNO porous auxiliary agent is added in the sedimentation process, so that the product is fluffy and has more gaps, if calcium carbonate and magnesium carbonate are further utilized subsequently, the grinding strength is not high, the use is convenient, and the method is suitable for large-scale technological application.

3. The invention provides a production method for accelerating the capture of carbon dioxide products by nanofiltration seawater, which has the advantages of high efficiency, low cost, convenient use and environmental friendliness.

Detailed Description

The present invention will be described in further detail with reference to specific examples. The raw materials of the embodiments of the invention are all purchased directly.

Example 1

Firstly, settling: adding sodium carbonate into waste water containing calcium carbonate and magnesium carbonate which are products of the nanofiltration seawater for capturing carbon dioxide, and adjusting the pH value to 8.5; then, on the basis of the treated product wastewater, continuously adding 1% by mass of basic polyaluminium chloride, 0.5ppm of Anionic Polyacrylamide (APAM), 0.05% by mass of NNO, wherein the molecular weight of the Anionic Polyacrylamide (APAM) is 1000 ten thousand until large flocculent calcium carbonate and magnesium carbonate are formed in the product wastewater containing the nanofiltration seawater for trapping carbon dioxide, controlling the temperature of the product wastewater at 6.5 ℃, and accelerating the sedimentation of the calcium carbonate and the magnesium carbonate; discharging the wastewater of the precipitated calcium carbonate and magnesium carbonate into a concentration tank through a pipeline, and pressing the calcium carbonate and the magnesium carbonate to dry by using a filter press to obtain blocky calcium carbonate and magnesium carbonate;

then, dicing: mechanically cutting the obtained blocky calcium carbonate and magnesium carbonate into blocks, and crushing the blocky calcium carbonate and magnesium carbonate into small blocky magnesium carbonate and calcium carbonate by adopting a crusher;

and finally, drying: and conveying the obtained small-block magnesium carbonate and calcium carbonate into a thermal infrared drying and heating cavity through a material conveying system for thermal infrared drying and drying treatment, wherein the retention time is 20 min. The water content was found to be 0.57%.

Example 2

Firstly, settling: adding potassium carbonate into the calcium carbonate and magnesium carbonate wastewater containing the products of the nanofiltration seawater capture carbon dioxide, and adjusting the pH value to 8.5; then, on the basis of the treated product wastewater, continuously adding 1% by mass of basic polyaluminium chloride, 10ppm of Anionic Polyacrylamide (APAM), 0.05% by mass of NNO, wherein the molecular weight of the Anionic Polyacrylamide (APAM) is 1800 ten thousand until large flakes of flocculent calcium carbonate and magnesium carbonate are formed in the product wastewater containing the nanofiltration seawater for trapping carbon dioxide, controlling the temperature of the product wastewater at 6.5 ℃, and accelerating the sedimentation of the calcium carbonate and the magnesium carbonate; discharging the wastewater of the precipitated calcium carbonate and magnesium carbonate into a concentration tank through a pipeline, and pressing the calcium carbonate and the magnesium carbonate to dry by using a filter press to obtain blocky calcium carbonate and magnesium carbonate;

then, dicing: mechanically cutting the obtained blocky calcium carbonate and magnesium carbonate into blocks, and crushing the blocky calcium carbonate and magnesium carbonate into small blocky magnesium carbonate and calcium carbonate by adopting a crusher;

and finally, drying: and conveying the obtained small-block magnesium carbonate and calcium carbonate into a thermal infrared drying and heating cavity through a material conveying system for thermal infrared drying and drying treatment, wherein the retention time is 20 min. The water content was found to be 0.42%.

Example 3

Firstly, settling: adding sodium carbonate into the waste water containing the product calcium carbonate and magnesium carbonate of the carbon dioxide trapped by the nanofiltration seawater, and adjusting the pH value to 7; then, on the basis of the treated product wastewater, continuously adding 2% by mass of basic polyaluminium chloride, 100ppm of Anionic Polyacrylamide (APAM) and 0.08% by mass of NNO, wherein the molecular weight of the Anionic Polyacrylamide (APAM) is 1500 ten thousand until large flakes of flocculent calcium carbonate and magnesium carbonate are formed in the product wastewater containing the nanofiltration seawater for capturing carbon dioxide, controlling the temperature of the product wastewater at 5 ℃, and accelerating the sedimentation of the calcium carbonate and the magnesium carbonate; discharging the wastewater of the precipitated calcium carbonate and magnesium carbonate into a concentration tank through a pipeline, and pressing the calcium carbonate and the magnesium carbonate to dry by using a filter press to obtain blocky calcium carbonate and magnesium carbonate;

then, dicing: mechanically cutting the obtained blocky calcium carbonate and magnesium carbonate into blocks, and crushing the blocky calcium carbonate and magnesium carbonate into small blocky magnesium carbonate and calcium carbonate by adopting a crusher;

and finally, drying: and conveying the obtained small-block magnesium carbonate and calcium carbonate into a thermal infrared drying and heating cavity through a material conveying system for thermal infrared drying and drying treatment, wherein the retention time is 6 min. The water content was found to be 1.3%.

Example 4

Firstly, settling: adding potassium carbonate into the calcium carbonate and magnesium carbonate wastewater containing the products of the nanofiltration seawater capture carbon dioxide, and adjusting the pH value to 9; then, on the basis of the treated product wastewater, continuously adding 0.05% by mass of basic polyaluminium chloride, 0.5ppm by mass of Anionic Polyacrylamide (APAM), 0.1% by mass of NNO, wherein the molecular weight of the Anionic Polyacrylamide (APAM) is 1200 ten thousand until large flocculent calcium carbonate and magnesium carbonate are formed in the product wastewater containing the carbon dioxide trapped by the nanofiltration seawater, controlling the temperature of the product wastewater at 10 ℃, and accelerating the sedimentation of the calcium carbonate and the magnesium carbonate; discharging the wastewater of the precipitated calcium carbonate and magnesium carbonate into a concentration tank through a pipeline, and pressing the calcium carbonate and the magnesium carbonate to dry by using a filter press to obtain blocky calcium carbonate and magnesium carbonate;

then, dicing: mechanically cutting the obtained blocky calcium carbonate and magnesium carbonate into blocks, and crushing the blocky calcium carbonate and magnesium carbonate into small blocky magnesium carbonate and calcium carbonate by adopting a crusher;

and finally, drying: and conveying the obtained small-block magnesium carbonate and calcium carbonate into a thermal infrared drying and heating cavity through a material conveying system for thermal infrared drying and drying treatment, wherein the retention time is 30 min. The water content was 1.1% by detection.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.