Device and technology for industrial waste salt multi-level harmless treatment

Abstract

The invention discloses a device and technology for industrial waste salt multi-level harmless treatment. A first inlet is formed in a rotary kiln drying desorption device, the desorption device is connected with a mixing device, and an outlet of the mixing device is connected with a microwave splitting decomposition device; the microwave splitting decomposition device is connected with a refiningdevice, a second output of the refining device is connected with the microwave splitting decomposition device, and after waste salt enters the rotary kiln drying desorption device and the microwave splitting decomposition device, a large amount of organic matter is removed, and the waste salt flows into the refining device; an inlet of a tail gas treatment device is connected with an outlet of asecond-level incineration device, and a second outlet of the refining device is connected with a second inlet of the microwave splitting decomposition device. The technology comprises the processes offirst-level thermal desorption, second-level splitting decomposition, third-level salt refining, tail gas treatment and the like. According to the device and technology for industrial waste salt multi-level harmless treatment, refined salt is obtained after treated by the refining device, the device is simple in structure, residual microwave dielectric property substances can be recycled, the treatment cost is lowered, the waste salt is subjected to second-level harmless treatment, and the organic matter and water in the waste salt can be removed.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment and recycling, in particular to a device and process for multi-stage harmless disposal of industrial waste salt. Background technique [0002] Pesticides, medicines, dyes and other fine chemical industries produce a large amount of waste salt every year. Taking the pesticide industry as an example, the country discharges 300 million tons of wastewater every year, of which 8% is salty wastewater, and about 1 million tons of by-product salt are produced every year. With the promulgation of the Solid Law, the state has become more and more strict in the management of solid hazardous waste in the chemical industry, and has strengthened the supervision of saline wastewater in pesticide production and the recovery of solid salt. The main component of waste salt is inorganic salt, there is also a small amount of water and uncertain toxic organic substances, which cannot be directly used as ...

AI Technical Summary

Problems solved by technology

However, microwaves have the characteristic of selective heating. For substances with low dielectric constants, such as ceramics, polyethylene, polypropylene, etc., it is not easy to absorb microwaves.

The dielectric constant of organic matter in waste salt is low, and it is not easy to be heated, while the dielectric constant of sodium chloride is 8, which is relatively low, resulting in long heating time and large energy loss, which is not conducive to the cracking reaction of organic matter

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