Method for treating heavy-nitrogen mother solution generated from production of dinitrodiazophenol

Abstract

The invention relates to a method for treating the heavy-nitrogen mother solution generated from production of dinitrodiazophenol, comprising the following steps of: collecting the heavy-nitrogen mother solution into a primary acid-base regulation pool, mixing, adjusting the pH value to 3, lifting onto an iron-carbon bed, making the effluent flow into a secondary acid-base regulation pool, adjusting the pH value to 3-4, feeding into a Fenton-like reaction pool for reaction, making the mother solution flow into a neutralization pool, adding carbide slag to adjust the pH to 7-8, filing nitrogen in the mother solution at the same time, making the mother solution flow into a flocculation and sedimentation pool, feeding the supernatant obtained by settling into a subsequent biological treatment unit, treating until the supernatant reaches the standard, discharging or recycling, lifting the sludge obtained by precipitating into a sludge concentration pool, making the supernatant obtained by concentrating reflow into the primary acid-base regulation pool, feeding the concentrated sludge into a horizontal helical centrifuge for centrifugal dehydrating, mixing the dehydrated sludge into steam coal for combustion and utilization, and making a centrifugal separation solution reflow into the primary acid-base regulation pool. The method provided by the invention has the advantages of low investment and stable effect, adopts the carbide slag and waste the scrap iron as the materials for treatment and achieves the purpose of treating the wastes by the wastes.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for treating diazo mother liquor in the production process of priming agent dinitrodiazonium phenol. Background technique [0002] As a primary explosive, dinitrodiazophenol has been widely used in various domestic explosives because of its good explosive performance, safe production process, wide source of raw materials, and low purchase cost. At present, the production method of dinitrodiazophenol commonly used in China is the sodium salt method, which produces about 200kg-300kg of mother liquor for every 1kg of dinitrodiazophenol produced, and the mother liquor production is very high. Dinitrodiazophenol production mother liquor has complex components, which are derived from the diazo mother liquor in the diazotization process of sodium aminopicrate in the second-stage production process, and contain a large amount of toxic and harm...

AI Technical Summary

Problems solved by technology

Dinitrodiazophenol production mother liquor has complex components, which are derived from the diazo mother liquor in the diazotization process of sodium aminopicrate in the second-stage production process, and contain a large amount of toxic and harmful pollutants such as diazo, nitro, and nitroso , COD up to 1.0×10 4 -1.5×10 4 mg / L, poor biodegradability, coupled with the strong acidity of the mother liquor itself, the chroma can reach 3.0×10 4 -4.0×10 4 Times, if not effectively treated, it will be more harmful to the environment

Most of these treatment methods have disadvantages such as relatively complicated process, poor treatment effect, difficulty in meeting discharge standards, high investment costs, and large treatment costs, which make it difficult for production enterprises to bear.

At the same time, during the process of processing, the dinitrodiazonium phenol in the mother liquor often has explosive properties due to deposition and crystallization (dinitrodiazophenol is very easy to explode even in water), causing many companies to deal with such An accidental explosion occurred in the process of mother liquor, causing certain casualties and economic losses

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