Industrial salt slag pyrolysis method

A technology of industrial salt and salt slag, applied in the purification of alkali metal sulfite/sulfate, alkali metal chloride, alkali metal halide, etc., can solve the problems of unsatisfactory requirements and high organic content, and reduce the supply of heat energy , high removal rate and low cost

Inactive Publication Date: 2020-04-10
汪瑜
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AI Technical Summary

Problems solved by technology

Incineration and high-temperature pyrolysis can remove most of the organic matter in the salt residue, but the content of organic matter in the salt is still high, which cannot meet the requirements of the soda ash and chlor-alkali industries for raw salt

Method used

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  • Industrial salt slag pyrolysis method

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Embodiment Construction

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0033] The industrial salt residue pyrolysis method is characterized in that it comprises the following steps:

[0034] (1) Pretreatment of salt residue:

[0035] 1). Salt residue crushing: The salt residue is sent to the crusher for crushing treatment, so that the particle size of the salt residue ≦10mm;

[0036] 2). Salt residue pulping: After the system debugging is completed, the centrifugal liquid produced by the centrifuge, the brine or condensate produced by the organic matter adj...

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Abstract

The invention discloses an industrial salt residue pyrolysis method. The method comprises a salt residue pretreatment process and a salt residue pyrolysis process, and the salt residue pretreatment process is completed through the steps of salt residue crushing, salt residue pulping, homogenization, salt slurry storage, salt residue dehydration, salt residue drying and the like; and the pretreatedsalt slag passes through an automatic feeding system, a feed pyrolysis heater, a pyrolysis tower and a salt slag discharging heat exchanger, and the pyrolyzed salt slag is cooled, and then is fed into a follow-up brine making, brine refining and brine salt making system to complete the whole salt slag pyrolysis process. After the salt slag enters the pyrolysis tower, the salt slag is finally recovered to an original crystalline state, the temperature of the pyrolysis system is stable, the removal rate of organic matters in the salt slag is high, and the product can be regenerated and recycledand is green and environment-friendly.

Description

Technical field: [0001] The invention relates to the technical field of resource utilization of industrial salt slag, in particular to a pyrolysis method of industrial salt slag. Background technique: [0002] Industrial salt residues are mainly derived from pesticides, pharmaceuticals, fine chemicals (intermediates), coal chemicals, printing and dyeing and other industrial industries. They are mainly chemical reactions under acid and alkali conditions, salting out, color fixation and other chemical reactions. The produced high-salt wastewater is treated by evaporation and crystallization process to obtain NaCl, Na 2 SO 4 A mixture of one or more inorganic salts and organic pollutants, other salts and mechanical impurities, is classified as hazardous waste. [0003] National industrial production produces a large amount of by-product salt slag each year. In 2017, the country produced 200,000 tons of coal chemical salt slag, 2.73 million tons of pesticide salt slag, 400,000 tons of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01D3/14C01D5/16
CPCC01D3/04C01D3/14C01D5/16
Inventor 汪瑜
Owner 汪瑜
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