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Method for refining industrial waste salt

A technology for industrial waste salt and refining treatment, which is applied in the preparation of alkali metal halide shape, alkali metal sulfite/sulfate purification, alkali metal halide purification, etc. Block, high processing cost, low product purity and other problems, to achieve the effect of low cost, simple process and low energy consumption

Inactive Publication Date: 2020-01-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In CN104344407A, the method of high-temperature cracking is adopted to remove organic matter in industrial waste salt slag, but it is difficult to solve the problem of ringing and agglomeration of by-product salt in thermal equipment at high temperature, and the processing cost is relatively high
However, there are still problems such as poor universality, complicated process and low product purity.

Method used

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  • Method for refining industrial waste salt
  • Method for refining industrial waste salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] (1) Mix industrial waste salt and salt washing agent and perform pretreatment at 60° C. for 6 hours, and then separate solid and liquid to obtain pretreatment salt and filtrate; the industrial waste salt is sodium chloride waste salt; the The content of salt in the industrial waste salt is 80%; the salt washing agent is ethanol; the volume to mass ratio of the salt washing agent and industrial waste salt is 6:1; the pretreatment is rinsing; the rinsing method is Stir and rinse;

[0088] (2) The pretreatment salt obtained in step (1) is subjected to chemical salts, followed by oxidation treatment to obtain a primary treatment solution; the mass concentration of the salt solution after chemical salts in the chemical salts is 20wt%; the oxidation treatment method adopts Stepwise oxidation; the stepwise oxidation includes preliminary oxidation and deep oxidation; the oxidant used in the preliminary oxidation is sodium peroxide; the oxidant used in the deep oxidation is sodi...

Embodiment 2

[0093] (1) Mix industrial waste salt and washing salt agent and perform pretreatment at 20°C for 1 hour, and then separate solid and liquid to obtain pretreatment salt and filtrate; the industrial waste salt is sodium sulfate waste salt; the industrial waste salt is The content of salt in the waste salt is 97%; the salt washing agent is methanol; the volume to mass ratio of the salt washing agent and industrial waste salt is 1:1; the pretreatment is rinsing; the rinsing method is stirring rinsing;

[0094] (2) The pretreatment salt obtained in step (1) is subjected to chemical salting, followed by oxidation treatment to obtain a primary treatment solution; the mass concentration of the salt solution after chemical salting in the chemical salt is 30wt%; the oxidation treatment method adopts Stepwise oxidation; the stepwise oxidation includes preliminary oxidation and deep oxidation; the oxidant used in the preliminary oxidation is hydrogen peroxide and ozone; the oxidant used i...

Embodiment 3

[0099] (1) Mix industrial waste salt and salt washing agent and perform pretreatment at 10°C for 12 hours, and then separate solid and liquid to obtain pretreatment salt and filtrate; the industrial waste salt is sodium chloride waste salt; the The content of salt in the industrial waste salt is 50%; the salt washing agent is petroleum ether; the volume to mass ratio of the salt washing agent and industrial waste salt is 10:1; the pretreatment is rinsing; the rinsing method It is one of suspension rinsing;

[0100] (2) carry out the pretreatment salt that step (1) obtains to salt, carry out oxidation treatment afterwards, obtain primary treatment liquid; In described salt, the mass concentration of salt solution after salt is 25wt%; Described oxidation treatment mode adopts Step-by-step oxidation; said step-by-step oxidation includes preliminary oxidation and deep oxidation; said preliminary oxidation used oxidant is peracetic acid and oxygen; said deep oxidation used oxidant ...

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Abstract

The invention relates to a method for refining an industrial waste salt. The method comprises the following steps: the industrial waste salt is mixed and preprocessed with a salt leaching agent, and then solid-liquid separation is carried out to obtain a preprocessed salt and a filtrate; the preprocessed salt is subjected to salt dissolving, and then is oxidized to obtain a primary treatment liquid; and the primary treatment liquid is adsorbed and finely filtered, and then is crystallized to obtain a refined crystallized salt. The method realizes effective separation of organic matters and salt in the waste salt, ensures effective separation and removal of the organic matters in the industrial waste salt and adsorption and fine filtration removal of other impurities in the industrial wastesalt, and realizes the refining of the high-quality crystallized salt. The method has the advantages of simple process, low energy consumption, low cost and mild conditions, does not produce industrial three wastes in the treatment process, and is an environmentally-friendly salt refining technology.

Description

technical field [0001] The invention relates to the technical field of industrial waste salt recovery, in particular to a refining treatment method for industrial waste salt. Background technique [0002] Waste salt mainly comes from the chemical industry. It has the characteristics of various types, complex components, multiple sources, high content of toxic and harmful substances, high treatment costs, and great environmental hazards. It has attracted widespread attention from the public and managers. At the same time, as people's desire for a green environment becomes stronger, and with the gradual improvement of environmental protection requirements, industrial waste salt must be disposed of reasonably in order to realize its harmlessness to the environment and realize the effective and comprehensive recovery of waste resources. use. [0003] Industrial salt is not only an important chemical raw material, but also a national strategic resource. Recycling industrial by-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/16C01D3/24C01D5/16
CPCC01D3/16C01D3/24C01D5/16C01P2006/80
Inventor 徐红彬唐海燕陈辉霞张笛孙晓岩孙继远
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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