High-organic-matter sodium sulfate hazardous waste simple recycling process and system

Abstract

The invention discloses a high-organic-matter sodium sulfate concentrated solution simple recycling process and system. The method comprises the steps: determining according to hazardous waste total organic carbon, and adding a proper amount of a reducing agent into a material; and drying the mixture with system waste heat, allowing the mixture to enter a rotary reduction furnace, producing a sodium sulfide product, absorbing tail gas with an alkali, and producing anhydrous sodium sulfite. According to the process, wastewater COD oxygen consumption characteristics and the self heat value are creatively utilized, heat producing from organic matter decomposition is used, sodium sulfate is reduced to produce sodium sulfide while organic matters are degraded, high-cost treatment of sulfate hazardous waste is changed into benefit production, and the process is an ideal path for recycling the high-organic-matter sodium sulfate hazardous waste, and has huge economic value and social benefits.

Description

technical field [0001] The invention relates to a simple recycling process and device system for the production of sodium sulfide and sodium sulfite from high-organic sodium sulfate hazardous waste, which is suitable for recycling various sulfate and sulfite solutions or solid hazardous waste containing organic matter, and belongs to the resource environment field. Background technique [0002] Over 10 million tons of sulfuric acid are used for organic synthesis in the chemical industry at home and abroad, and a large part of it is converted into sulfate solution containing organic matter. Concentrating these solutions is one of the mainstream processes, and a large amount of sulfate containing organic matter is inevitably produced. It is estimated that there are more than 10 million tons of concentrated liquids or solids per year, which are typical hazardous wastes. The components of these hazardous wastes are extremely complex. Most of the existing advanced oxidation, extr...

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Problems solved by technology

[0002] Over 10 million tons of sulfuric acid are used for organic synthesis in the chemical industry at home and abroad, and a large part of it is converted into sulfate solution containing organic matter. Concentrating these solutions is one of the mainstream processes, and a large amount of sulfate containing organic matter is inevitably produced. It is estimated that there are more than 10 million tons of concentrated liquids or solids per year, which are typical hazardous wastes. The components of these hazardous wastes are extremely complex. Most of the existing advanced oxidation, extraction and other processes, as well as stacking or incineration, are not completely treated. Moreover, the cost is huge and consumes a lot of social resources; the annual by-product of sodium sulfate and sodium sulfite mixture in the alkaline desulfurization industry is also one million tons, and there is no reasonable utilization process for the mixture, which has caused huge environmental pressure.

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