Comprehensive treatment and reutilization method for industrial inorganic waste salt containing organic pollutants

Abstract

The invention belongs to the field of environmental protection, and discloses a comprehensive treatment and reutilization method of industrial inorganic waste salt containing organic pollutants, whichcomprises the following steps of: dissolving, layering and separating the industrial waste salt to obtain an oil phase and a waste salt solution; enabling the waste salt solution to enter an adsorption unit for adsorption treatment, adsorbing organic matters by an adsorbent, and purifying to obtain an industrial salt solution; enabling the saturated adsorbent to enter a microwave regeneration device, performing microwave pyrolysis regeneration in a nitrogen atmosphere, enabling generated gas containing organic matters and an oil phase obtained by liquid separation to enter an oxygen crackingdevice, and performing catalytic oxidative cracking treatment in an air atmosphere under the action of a catalyst to realize deep purification. According to the method, various sodium chloride industrial waste salts can be systematically and efficiently treated, the TOC removal rate reaches 98% or above, and the final recovery rate of sodium chloride reaches 99%. By adopting the method to treat the industrial waste salt, purification treatment and resource reutilization of the waste salt can be realized, and the method has very high social and economic benefits.

Description

technical field [0001] The invention belongs to the field of comprehensive treatment and utilization of environmental protection and chemical waste, and in particular relates to a method for comprehensive treatment and reuse of industrial inorganic waste salt containing organic pollutants. Background technique [0002] Waste salt and residues mainly come from the chemical industry, which have the characteristics of various types, complex components, multiple sources, high content of toxic and harmful substances, high treatment costs, and great environmental hazards. The treatment and disposal of waste salt and residues has become an urgent problem to be solved. . [0003] Chemical products, especially pesticides, will produce a large amount of by-product salt slag. The annual by-product salt slag in the country is more than 8 million tons of sodium chloride salt slag. The pollutants are mainly organic matter with complex components and poisonous Large, highly accumulative, ...

AI Technical Summary

Problems solved by technology

However, sodium chloride absorbs microwave weakly and it is difficult to achieve high temperature. Under nitrogen atmosphere, long carbon chain organic matter and aromatic ring, condensed ring and heterocyclic organic matter cannot be oxidized and decomposed, and microwave treatment is prone to defects such as uneven heating and local overheating.

CN205659976U discloses a process for treating waste salt, adopts the method of "melting impurity removal-condensation" to remove organic matter, and obtains high-quality salt, but its energy consumption is too high, and the requirements for equipment are relatively high

In addition to the above methods, there are also high-temperature oxidation methods, graded critical carbonization methods, etc., but they also have the disadvantages of immature technology and high energy consumption.

Images