Treatment method of industrial waste sodium acetate slag

Abstract

A treatment method for industrial waste sodium acetate slag belongs to the technical field of environmental protection and industrial waste treatment. The method is to mix the microwave absorbing medium particles and the industrial waste sodium acetate slag particles. As for the microwave processor, the solvent and the volatile solvent in the waste sodium acetate slag are removed by using microwave energy under vacuum, low temperature and constant stirring and mixing. The substance is extracted, and part of the solvent can be recovered after the extracted gas is condensed, and then microwave energy is used to degrade the remaining sodium acetate slag at high temperature under air atmosphere and constant stirring, and the generated gas containing waste is discharged after gas purification, microwave absorption medium particles The addition of the waste sodium acetate slag ensures that the waste sodium acetate slag is effectively and uniformly heated in a short time, and the pollutants are fully thermally decomposed and converted into sodium carbonate, which can be dissolved in water, and the microwave absorbing medium particles are recycled for reuse.

Description

technical field [0001] The invention relates to a treatment method for industrial waste sodium acetate slag, belonging to the technical fields of environmental protection and industrial waste treatment. Background technique [0002] 5,10-dihydroxy-(2,3-dicyano)-1,4-dithiothia is a pesticide intermediate with a huge market, and its product is in short supply, and the production process of this product requires the use of dimethyl Sulfoxide (DMSO) is the solvent, and after the product is purified, a large amount of DMSO solution containing sodium acetate, 2,3-dimercaptomaleonitrile sodium salt, and naphthoquinone has been reacted intermediates will be produced. At present, the solution can be evaporated by raking Most of the DMSO is recovered by the method, but the generated waste residue cannot be further processed because of the foul smell and high toxicity. The accumulation of such waste residue has become an important environmental protection hazard for related enterprises...

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Problems solved by technology

[0002] 5,10-dihydroxy-(2,3-dicyano)-1,4-dithiothia is a pesticide intermediate with a huge market, and its product is in short supply, and the production process of this product requires the use of dimethyl Sulfoxide (DMSO) is the solvent, and after the product is purified, a large amount of DMSO solution containing sodium acetate, 2,3-dimercaptomaleonitrile sodium salt, and naphthoquinone has been reacted intermediates will be produced. At present, the solution can be evaporated by raking Most of the DMSO is recovered by the method, but the generated waste residue cannot be further processed because of the foul smell and high toxicity. The accumulation of such waste residue has become an important environmental protection hazard for related enterprises

[0003] This kind of waste residue with sodium acetate as the main component is very difficult to be processed by incinerators. There are three reasons. First, sodium acetate, the main component of waste residue, is only converted into sodium carbonate after burning, and its burning weight loss is very small. The unloading load is heavy; second, the sodium carbonate produced by the burning of waste slag has a considerable corrosion and damage effect on the furnace of the incinerator; third, a small amount of DMSO and cyanide-containing organic salts and other components coexisting in the waste slag produce a large amount of stench after burning gas, SO 2 and NOx, overwhelming the gas treatment unit of the post-incinerator system

[0004] Technical solution CN104344407A proposes a method for decomposing organic matter and decomposable inorganic salt in waste salt by microwave heating. harmless of salt, but there are three obvious technical defects in this technical scheme: 1) sodium acetate is a weak microwave absorption medium, and it is difficult to achieve efficient heating of it by microwave treatment; 2) under nitrogen atmosphere, long carbon chain organic matter and Aromatic rings, condensed rings, and heterocyclic organics often undergo polymerization and coking reactions, but cannot oxidatively decompose, which leads to microwave treatment under nitrogen, which instead increases the content of organic polymers similar to tar in waste salt, and the color is darker, and its toxicity did not decrease significantly, and even increased

3) Microwave treatment is prone to uneven heating and local overheating. When waste salt contains DMSO, DMF and organic cyanide compounds, local overheating is likely to cause explosion accidents

[0005] In summary, there is still no effective method that can successfully process polluted industrial waste sodium acetate

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