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Treatment method of salt mud wastes produced in chlor-alkali industry and application thereof

A treatment method and technology of the chlor-alkali industry, applied in the fields of environmental protection and solid waste resource utilization, can solve the problems of polluting the environment, increasing the operating cost of the enterprise, wasting resources, etc., achieving a short treatment process, increasing desulfurization benefits, and reducing desulfurization costs. Effect

Inactive Publication Date: 2018-06-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main domestic disposal method for salt mud slurry is injection into wells or landfill as solid waste. This method not only wastes resources, but also pollutes the environment. At the same time, it requires investment and increases the operating cost of the enterprise.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The salt mud slurry discharged from the three-layer mud washing tank in the raw salt refining unit of an electrolysis device in an enterprise is mixed with water at a volume ratio of 1:1 and washed twice. The Na in the salt mud slurry + The content is 0.03%, K + The content is 0.01%, Cl - The content of the salt is 0.03%. The supernatant after washing the precipitate is returned to the salt tank for the dissolution of the original salt, and the salt in it is recovered. The washed salt mud slurry is transported to the plate and frame filter press, and after pressure filtration and dehydration for 15 minutes under the pressure of 0.4MPa, the CaCO in the salt mud 3 The content is 49.8%, Mg(OH) 2 The content of water is 25.9%, the moisture content is 12%, the content of insoluble matter is 10.6%, and the content of dissolved salts is 1.5%. After the dehydrated salt mud is ground and screened, the particle size of all the salt mud is 0.5-0.9 mm.

[0037] The salt mud treat...

Embodiment 2

[0039] The salt mud slurry discharged from the three-layer mud washing tank in the raw salt refining unit of an electrolysis device in an enterprise is stirred and washed once with water at a volume ratio of 1:1. The Na in the salt mud slurry + The content is 0.04%, K + The content is 0.01%, Cl - The content is 0.04%, and the supernatant after washing the precipitate is returned to the salt tank for the dissolution of the original salt, and the salt in it is recovered. Transport the washed salt mud slurry to a plate-and-frame filter press, press filter and dehydrate for 18 minutes under a pressure of 0.4 MPa, the CaCO in the salt mud 3 The content is 50.8%, Mg(OH) 2 The content of water is 26.3%, the water content is 10.5%, the content of insoluble matter is 10.7%, and the content of dissolved salts is 1.5%. After the dehydrated salt mud is ground and screened, the particle size of all the salt mud is 0.5-0.9 mm.

[0040] The salt mud treated by the above method is evenly ...

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Abstract

The invention relates to a treatment method of salt mud wastes generated in chlor-alkali industry. The treatment method comprises the following steps: washing salt mud liquid with water to obtain supernatant liquid and concentrated salt mud liquid; performing pressure filtration dehydration on the concentrated salt mud liquid to obtain filtrate and dehydrated salt mud; grinding and sieving the dehydrated salt mud to obtain powder salt mud. After the salt mud liquid is treated according to the method provided by the invention, the salt mud liquid can replace part of commercial desulfurizing agent quicklime powder and be used for semi-dry desulfurization of boiler flue gas. The treatment process of the salt mud liquid in the method provided by the invention is short, the method is simple andeasy to operate, the treatment cost is low, and no 'three wastes' are discharged in a treatment process, so that the problem of treating the salt mud liquid in the chlor-alkali industry is solved, and treatment of wastes with processes of wastes against one another is realized; by using the desulfurizing agent, the original desulfurization process does not need to be changed and the desulfurization cost of the boiler flue gas is reduced.

Description

technical field [0001] The present invention relates to the application of salt mud, a solid waste in the chlor-alkali industry, in boiler flue gas desulfurization, and specifically relates to the semi-dry desulfurization of boiler flue gas by replacing part of the commercial desulfurizer quicklime powder with effectively treated salt mud. It belongs to the field of resource utilization of solid waste and the field of environmental protection. Background technique [0002] The chlor-alkali industry prepares NaOH and Cl by electrolysis of saturated NaCl solution 2 and H 2 , and use them as raw materials to produce a series of chemical products. The chlor-alkali industry uses raw salt as raw material, and the saturated NaCl solution obtained by turning the raw salt into salt contains not only NaCl but also a small amount of Ca 2+ and Mg 2+ If they are not removed, they will form precipitates in the process of making alkali, adhere to the equipment or pipe wall or remain in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 饶辉凯蒲文晶王俊杨晓明钟大辉盛光刘成刚李一明
Owner PETROCHINA CO LTD
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