Device for coupling and recycling sodium sulfate and carbide slag in coal chemical industry

Abstract

The utility model belongs to the technical field of coupling and recycling of sodium sulfate and carbide slag, and particularly relates to a coupling and recycling device for sodium sulfate and carbide slag in the coal chemical industry, which couples sodium sulfate and carbide slag generated by a coal chemical industry wastewater treatment device and simultaneously produces sodium hydroxide, sodium chloride and calcium sulfate. The produced sodium hydroxide is used for adjusting the PH of the coal chemical wastewater treatment device, and the produced sodium chloride clear liquid is fed into the coal chemical wastewater treatment device to be evaporated and crystallized to produce high-purity sodium chloride salt; or the produced sodium chloride clear liquid is fed into a nanofiltration device of the coal chemical industry wastewater treatment device for concentration and purification, and then is fed into evaporative crystallization to produce high-purity sodium chloride salt; calcium sulfate is used for building, papermaking, chemical industry, agriculture and the like, the sodium sulfate waste salt and the carbide slag solid waste generated by the coal chemical industry wastewater treatment device are effectively recycled, and the production cost of an enterprise for treating the sodium sulfate waste salt and the carbide slag is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sodium sulfate and calcium carbide slag coupling recycling technical field, specifically a kind of coal chemical industry sodium sulfate salt and calcium carbide slag coupling recycling device. BACKGROUND

[0002] The rapid development of coal industry not only plays the advantage of China's coal resources, but also supplements a large amount of oil and natural gas resources, ensuring China's energy security.

[0003] The sodium sulfate salt generated by wastewater treatment is temporarily managed as solid waste and sent to a qualified solid waste disposal center for treatment or landfill. However, the number of qualified treatment centers is small, the treatment capacity is limited, and the treatment cost is high, with a treatment cost of about 500-1000 yuan per ton of sodium sulfate salt. Due to the protection of the traditional salt industry, it is difficult to find a suitable way to resource utilization of the by-product sodium sulfate salt.

[0004] In addition, the production of acetylene from coal to calcium carbide and then to PVC, BDO and other downstream products is an important part of the comprehensive utilization of coal resources. The calcium carbide acetylene method accounts for about 80% of the total PVC production capacity and more than 90% of the total BDO production capacity. The solid waste calcium carbide slag (mainly calcium hydroxide) generated during the production of calcium carbide is increasingly prominent. For example, for every ton of PVC produced, about 1.2 tons of calcium carbide slag is produced as a by-product. The huge amount of calcium carbide slag has seriously restricted the sustainable development of the industry. UTILITY MODEL CONTENT

[0005] Based on the problems of the prior art, the utility model provides a device for coupling and recycling of coal chemical industry sodium sulfate salt and calcium carbide slag. The device couples the sodium sulfate salt generated by the wastewater treatment device of a coal chemical enterprise with the calcium carbide slag generated by an acetylene production enterprise using the calcium carbide method, and simultaneously produces sodium hydroxide, sodium chloride and calcium sulfate. The sodium sulfate waste salt and calcium carbide slag are effectively resource utilized, the calcium sulfate can be used in the building industry for building materials, thermal insulation materials, coatings, reinforcing materials, etc. It can also be used in the paper industry to replace part or most of the pulp, which can greatly reduce wood consumption, protect the environment and reduce wastewater pollution. It can also be used in the chemical industry as a reinforcing material, and in agriculture as a fertilizer to reduce soil alkalinity and improve soil performance. Sodium hydroxide can be used for coal chemical wastewater treatment, and sodium chloride can be further sent to a coal chemical wastewater treatment device to prepare high-purity sodium chloride salt.

[0006] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0007] The utility model provides a kind of coal chemical industry sodium sulfate salt and calcium carbide slag coupling recycling device, including calcium carbide slag reaction pool, liquid removal device, the calcium carbide slag reaction pool includes calcium carbide slag reaction pool a and calcium carbide slag reaction pool b, the liquid removal device includes liquid removal device a, liquid removal device b, liquid removal device c, the calcium carbide slag reaction pool a, sodium hydroxide clarification tank, sodium hydroxide clear liquid tank are sequentially smoothly connected;Sodium hydroxide clear liquid tank is connected with coal chemical industry wastewater treatment device;The calcium carbide slag reaction pool b, calcium chloride clarification tank, calcium chloride reaction tank, sodium chloride clarification tank, sodium chloride clear liquid tank, the evaporation crystallization device or nanofiltration device of coal chemical industry wastewater treatment device are sequentially connected in proper order, the calcium carbide slag reaction pool a is connected with liquid removal device a by pipeline, the liquid outlet of liquid removal device a is connected to sodium hydroxide buffer tank import by pipeline, and sodium hydroxide buffer tank export is connected to sodium hydroxide clarification tank by pipeline and sodium hydroxide pump;The calcium carbide slag reaction pool b is connected with liquid removal device b by pipeline, and the liquid outlet of liquid removal device b is connected to calcium chloride buffer tank import by pipeline, and calcium chloride buffer tank export is connected to calcium chloride clarification tank by pipeline and calcium chloride pump;The calcium chloride reaction tank is connected with liquid removal device c by pipeline, and the liquid outlet of liquid removal device c is connected to sodium chloride buffer tank import by pipeline, and sodium chloride buffer tank export is connected to sodium chloride clarification tank by pipeline and sodium chloride pump.

[0008] The calcium carbide slag reaction pool a and calcium chloride reaction tank are provided with sodium sulfate adding device, and the calcium carbide slag reaction pool b is provided with hydrochloric acid adding pipeline.

[0009] Further, the calcium carbide slag reaction pool a, the calcium carbide slag reaction pool b and the calcium chloride reaction tank are provided with stirring devices.

[0010] Further, the liquid removal device is a plate-and-frame filter press, a chamber filter press, a vertical filter press or a belt filter press.

[0011] Further, the bottoms of the sodium hydroxide clarification tank, the calcium chloride clarification tank and the sodium chloride clarification tank are conical structures, and are connected to the liquid removal device a, the liquid removal device b and the liquid removal device c by pipelines respectively.

[0012] Further, the sodium sulfate adding devices are connected to the nanofiltration device of the coal chemical industry wastewater treatment device, and the nanofiltration device provides sodium sulfate solution for the calcium carbide slag reaction pool a and the calcium chloride reaction tank.

[0013] Further, the sodium sulfate adding devices are connected to the sodium sulfate refrigeration crystallization device of the coal chemical industry wastewater treatment device, and the sodium sulfate refrigeration crystallization device provides solid sodium sulfate for the calcium carbide slag reaction pool a and the calcium chloride reaction tank. Beneficial effects

[0014] 1. The utility model discloses a sodium sulfate salt produced by coal chemical industry wastewater treatment device and calcium carbide slag are coupled and sodium hydroxide, sodium chloride, calcium sulfate are produced simultaneously, the sodium hydroxide produced is used for adjusting PH of coal chemical industry wastewater treatment device, the sodium chloride clear solution produced is sent into the evaporation crystallization of coal chemical industry wastewater treatment device to produce high-purity sodium chloride salt, or the sodium chloride clear solution produced is sent into the nanofiltration device of coal chemical industry wastewater treatment device and is sent evaporation crystallization after concentration purification to produce high-purity sodium chloride salt, and the calcium sulfate is used for building, papermaking, chemical industry and agriculture etc.

[0015] 2. The utility model discloses that calcium carbide slag reacts with hydrochloric acid, and the calcium chloride turbid solution obtained by reaction is clarified and then reacts with sodium sulfate to produce calcium sulfate precipitate and sodium chloride solution, most of the impurities in calcium carbide slag are separated from calcium, and high-purity calcium sulfate is obtained, which can be used in chemical industry or papermaking industry.

[0016] 3. The utility model discloses that calcium carbide slag directly reacts with sodium sulfate, and calcium sulfate and calcium carbide residue are mixed together while producing sodium hydroxide, and low-purity calcium sulfate is obtained, which can be used in building industry and agriculture.

[0017] 4. The utility model discloses that the purity of calcium hydroxide in calcium carbide slag can be flexibly adjusted, when the purity of calcium hydroxide is high, it can be used to prepare calcium sulfate and sodium chloride, and when the purity of calcium hydroxide is low, it can be used to prepare calcium sulfate and sodium hydroxide. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is structure schematic drawing a of the utility model;

[0019] Figure 2 It is structure schematic drawing b of the utility model;

[0020] In the figure: 1-carbide slag reaction tank a; 2-sodium hydroxide clarification tank; 3-sodium hydroxide clear liquid tank; 4-coal chemical wastewater treatment device; 5-liquid removal device a; 6-sodium hydroxide buffer tank; 7-sodium hydroxide pump; 8-carbide slag reaction tank b; 9-calcium chloride clarification tank; 10-carbide slag reaction tank; 11-sodium chloride clarification tank; 12-sodium chloride clear liquid tank; 13-evaporative crystallization device; 14-liquid removal device b; 15-calcium chloride buffer tank; 16-calcium chloride pump; 17-liquid removal device c; 18-sodium chloride buffer tank; 19-sodium chloride pump; 20-hydrochloric acid adding pipeline; 21-sodium sulfate adding device; 22-nanofiltration device. DETAILED DESCRIPTION Example 1

[0021] Reference Figure 1 In order to make the sodium sulfate solid waste resources generated by the coal chemical wastewater treatment device and the carbide slag solid waste resources be effectively utilized, the two are coupled, while outputting sodium hydroxide, sodium chloride and calcium sulfate, so as to reduce the cost of the enterprise for treating sodium sulfate solid waste and carbide slag solid waste. The utility model provides a kind of coal chemical sodium sulfate salt and carbide slag coupling reuse's device, including carbide slag reaction tank, liquid removal device, the carbide slag reaction tank includes carbide slag reaction tank a1 and carbide slag reaction tank b8, the carbide slag reaction tank also has the effect of pulping, and make carbide slag into slurry;The liquid removal device includes liquid removal device a5, liquid removal device b14, liquid removal device c17, and the liquid removal device is plate-frame filter press, so that solid and liquid are separated after reaction;Carbide slag reaction tank a1, sodium hydroxide clarification tank 2, sodium hydroxide clear liquid tank 3 are sequentially smoothly connected;Sodium hydroxide clear liquid tank 3 is connected with coal chemical wastewater treatment device 4, so that sodium hydroxide clear liquid is used for coal chemical wastewater treatment device 4, and PH is adjusted;Carbide slag reaction tank b8, calcium chloride clarification tank 9, calcium chloride reaction tank 10, sodium chloride clarification tank 11, sodium chloride clear liquid tank 12, the evaporative crystallization device 13 of coal chemical wastewater treatment device 4 are sequentially connected in order, and the liquid outlet of liquid removal device a5 is connected to the inlet of sodium hydroxide buffer tank 6 by pipeline, and the outlet of sodium hydroxide buffer tank 6 is connected to sodium hydroxide clarification tank 2 by pipeline and sodium hydroxide pump 7;Carbide slag reaction tank b8 is connected with liquid removal device b14 by pipeline, and the liquid outlet of liquid removal device b14 is connected to the inlet of calcium chloride buffer tank 15 by pipeline, and the outlet of calcium chloride buffer tank 15 is connected to calcium chloride clarification tank 9 by pipeline and calcium chloride pump 16;Carbide slag reaction tank b8 is connected with liquid removal device b14 by pipeline, and the liquid outlet of liquid removal device b14 is connected to the inlet of calcium chloride buffer tank 15 by pipeline, and the outlet of calcium chloride buffer tank 15 is connected to calcium chloride clarification tank 9 by pipeline and calcium chloride pump 16;The liquid outlet of liquid removal device c17 is connected to the inlet of sodium chloride buffer tank 18 by pipeline, and the outlet of sodium chloride buffer tank 18 is connected to sodium chloride clarification tank 11 by pipeline and sodium chloride pump 19.

[0022] The carbide slag reaction tank a1 and the calcium chloride reaction tank 10 are communicated with the sodium sulfate adding device 21, so that the sodium sulfate salt produced by the coal chemical wastewater treatment device 4 can be added into the carbide slag reaction tank a1 and the calcium chloride reaction tank 10, and the hydrochloric acid adding pipeline 20 is arranged on the carbide slag reaction tank b8.

[0023] The stirring devices are arranged in the carbide slag reaction tank a1, the carbide slag reaction tank b8 and the calcium chloride reaction tank 10, so that the reaction can be fully carried out.

[0024] The bottom of the sodium hydroxide clarification tank 2, the bottom of the calcium chloride clarification tank 9 and the bottom of the sodium chloride clarification tank 11 are arranged in a conical structure and are connected to the liquid removal devices a5, b14 and c17 respectively by pipelines, so that the calcium sulfate mud at the bottom of the sodium hydroxide clarification tank 2, the carbide residue mud at the bottom of the calcium chloride clarification tank 9 and the calcium sulfate mud at the bottom of the sodium chloride clarification tank 11 can be removed.

[0025] The sodium sulfate adding device 21 is connected with the nanofiltration device 22 of the coal chemical wastewater treatment device 4, and the nanofiltration device 22 provides the sodium sulfate solution for the carbide slag reaction tank a1 and the calcium chloride reaction tank 10. Example 2

[0026] Reference Figure 2, in order to make the coal chemical industry wastewater treatment device produced sodium sulfate solid waste resources and calcium carbide slag solid waste resources can be effectively utilized, both are coupled, while output sodium hydroxide, sodium chloride and calcium sulfate, so as to reduce the cost of enterprise processing sodium sulfate solid waste and calcium carbide slag solid waste. The utility model provides a kind of coal chemical industry sodium sulfate salt and calcium carbide slag coupling reuse's device, including calcium carbide slag reaction pool, liquid removal device, the calcium carbide slag reaction pool includes calcium carbide slag reaction pool a1 and calcium carbide slag reaction pool b8, the calcium carbide slag reaction pool also has the effect of pulping, and make calcium carbide slag into slurry;The liquid removal device includes liquid removal device a5, liquid removal device b14, liquid removal device c17, the liquid removal device is chamber filter press, and solid and liquid are separated after reaction;Calcium carbide slag reaction pool a1, sodium hydroxide clarification tank 2, sodium hydroxide clear liquid pool 3 are sequentially smoothly connected;Sodium hydroxide clear liquid pool 3 is connected with coal chemical industry wastewater treatment device 4, so that sodium hydroxide clear liquid is used for coal chemical industry wastewater treatment device 4, and PH is adjusted;Calcium carbide slag reaction pool b8, calcium chloride clarification tank 9, calcium chloride reaction tank 10, sodium chloride clarification tank 11, sodium chloride clear liquid pool 12, the nanofiltration device 22 of coal chemical industry wastewater treatment device 4 are sequentially connected in proper order, and nanofiltration device 22 is communicated with evaporation crystallization device 13 by pipeline;Sodium chloride clear liquid is sent evaporation crystallization device 13 after being concentrated and purified in nanofiltration device 22, and sodium chloride is produced;The liquid outlet of liquid removal device a5 is connected to sodium hydroxide buffer tank 6 inlet by pipeline, and the outlet of sodium hydroxide buffer tank 6 is connected to sodium hydroxide clarification tank 2 by pipeline and sodium hydroxide pump 7;The liquid outlet of liquid removal device b14 is connected to calcium chloride buffer tank 15 inlet by pipeline, and the outlet of calcium chloride buffer tank 15 is connected to calcium chloride clarification tank 9 by pipeline and calcium chloride pump 16;The liquid outlet of liquid removal device c17 is connected to sodium chloride buffer tank 18 inlet by pipeline, and the outlet of sodium chloride buffer tank 18 is connected to sodium chloride clarification tank 11 by pipeline and sodium chloride pump 19.

[0027] The calcium carbide slag reaction pool a1 and calcium chloride reaction tank 10 are communicated with sodium sulfate adding device 21, so that sodium sulfate salt produced by coal chemical industry wastewater treatment device 4 can be added to calcium carbide slag reaction pool a1 and calcium chloride reaction tank 10, and hydrochloric acid adding pipeline 20 is arranged on calcium carbide slag reaction pool b8.

[0028] Stirring devices are arranged in calcium carbide slag reaction pool a1, calcium carbide slag reaction pool b8 and calcium chloride reaction tank 10, so that reaction can be fully carried out.

[0029] The bottom of the sodium hydroxide clarifying tank 2, the bottom of the calcium chloride clarifying tank 9 and the bottom of the sodium chloride clarifying tank 11 are provided with a conical structure and are connected to the liquid removal devices a5, b14 and c17 respectively by pipelines, so that the calcium sulfate mud at the bottom of the sodium hydroxide clarifying tank 2, the calcium chloride mud at the bottom of the calcium chloride clarifying tank 9 and the calcium sulfate mud at the bottom of the sodium chloride clarifying tank 11 can be discharged from the liquid.

[0030] The sodium sulfate adding device 21 is connected to the sodium sulfate freezing crystallization device of the coal chemical industry wastewater treatment device 4, and the sodium sulfate freezing crystallization device provides solid sodium sulfate for the calcium carbide slag reaction tank a1 and the calcium chloride reaction tank 10.

[0031] Another embodiment is different from the embodiment 1 in that the liquid removal device is a vertical filter press.

[0032] Another embodiment is different from the embodiment 1 in that the liquid removal device is a belt filter press.

[0033] The working principle of the utility model is: the utility model couples the sodium sulfate salt generated by the coal chemical industry wastewater treatment device 4 with the calcium carbide slag to simultaneously produce sodium hydroxide, sodium chloride and calcium sulfate, the produced sodium hydroxide is used for adjusting the PH of the coal chemical industry wastewater treatment device 4, the produced sodium chloride clear liquid is sent to the coal chemical industry wastewater treatment device 4 to produce high-purity sodium chloride salt through evaporation crystallization, or the produced sodium chloride clear liquid is sent to the nanofiltration device 22 of the coal chemical industry wastewater treatment device 4 to carry out concentration and purification and then sent to the evaporation crystallization to produce high-purity sodium chloride salt, the calcium sulfate is used for building, papermaking, chemical industry and agriculture, etc., the utility model makes the sodium sulfate waste salt and calcium carbide slag solid waste generated by the coal chemical industry wastewater treatment device 4 effectively resource utilization, greatly reduces the production cost of enterprises for treating sodium sulfate waste salt and calcium carbide slag.

[0034] The modification and change of the utility model by those skilled in the art belong to the patent range of the utility model, and are not limited to the embodiment.

Claims

1. A device for coupling and recycling of coal chemical sodium sulfate salt and carbide slag, characterized in that: The application relates to a coal chemical industry wastewater treatment device, which comprises a carbide slag reaction tank, a liquid removal device, wherein the carbide slag reaction tank comprises a carbide slag reaction tank a and a carbide slag reaction tank b, the liquid removal device comprises a liquid removal device a, a liquid removal device b and a liquid removal device c, the carbide slag reaction tank a, a sodium hydroxide clarification tank and a sodium hydroxide clear liquid tank are sequentially and smoothly connected; the sodium hydroxide clear liquid tank is connected with a coal chemical industry wastewater treatment device; the carbide slag reaction tank b, a calcium chloride clarification tank, a calcium chloride reaction tank, a sodium chloride clarification tank, a sodium chloride clear liquid tank and an evaporation crystallization device or a nanofiltration device of the coal chemical industry wastewater treatment device are sequentially and smoothly connected, the carbide slag reaction tank a is connected with the liquid removal device a through a pipeline, a liquid outlet of the liquid removal device a is connected with an inlet of a sodium hydroxide buffer tank through a pipeline, an outlet of the sodium hydroxide buffer tank is connected with the sodium hydroxide clarification tank through a pipeline and a sodium hydroxide pump; the carbide slag reaction tank b is connected with the liquid removal device b through a pipeline, a liquid outlet of the liquid removal device b is connected with an inlet of a calcium chloride buffer tank through a pipeline, an outlet of the calcium chloride buffer tank is connected with the calcium chloride clarification tank through a pipeline and a calcium chloride pump; the calcium chloride reaction tank is connected with the liquid removal device c through a pipeline, a liquid outlet of the liquid removal device c is connected with an inlet of a sodium chloride buffer tank through a pipeline, an outlet of the sodium chloride buffer tank is connected with the sodium chloride clarification tank through a pipeline and a sodium chloride pump. ​ The carbide slag reaction tank a and the calcium chloride reaction tank are both provided with sodium sulfate adding devices, and the carbide slag reaction tank b is provided with a hydrochloric acid adding pipeline.

2. The device for coupling and recycling of sodium sulfate salt of coal chemical industry and carbide slag according to claim 1, characterized in that: Stirring devices are arranged in the carbide slag reaction tank a, the carbide slag reaction tank b and the calcium chloride reaction tank.

3. The device for coupling and recycling sodium sulfate salt of coal chemical industry with carbide slag according to claim 1, characterized in that: The liquid removal device is a plate-and-frame filter press, a chamber filter press, a vertical filter press or a belt filter press.

4. The device for coupling and recycling sodium sulfate salt of coal chemical industry with carbide slag according to claim 1, characterized in that: The bottom of the sodium hydroxide clarification tank, the bottom of the calcium chloride clarification tank and the bottom of the sodium chloride clarification tank are provided with a conical structure and are connected with the liquid removal device a, the liquid removal device b and the liquid removal device c through pipelines respectively.

5. The device for coupling and recycling of sodium sulfate salt of coal chemical industry and carbide slag according to any one of claims 1-4, characterized in that: The sodium sulfate adding devices are connected with a nanofiltration device of the coal chemical industry wastewater treatment device, and the nanofiltration device provides sodium sulfate solution for the carbide slag reaction tank a and the calcium chloride reaction tank.

6. The device for coupling and recycling of sodium sulfate salt of coal chemical industry and carbide slag according to any one of claims 1-4, characterized in that: The sodium sulfate adding devices are connected with a sodium sulfate refrigeration crystallization device of the coal chemical industry wastewater treatment device, and the sodium sulfate refrigeration crystallization device provides solid sodium sulfate for the carbide slag reaction tank a and the calcium chloride reaction tank.

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