Industrial waste salt resourceful treatment method

A technology for industrial waste salt and treatment methods, which is applied in the direction of chemical instruments and methods, solid waste removal, energy input, etc., can solve the problems of large amount of industrial waste salt, waste of resources, occupying large landfill resources, etc., and achieve product quality Excellent, reduced energy consumption, the effect of reducing energy consumption
CN114535264APending Publication Date: 2022-05-27SHANGYU ZHONGLIAN ENVIRONMENTAL PROTECTION CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
SHANGYU ZHONGLIAN ENVIRONMENTAL PROTECTION CO LTD
Publication Date
2022-05-27

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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to an industrial waste salt resourceful treatment method, which comprises the following steps: sequentially carrying out crushing, mixing and compounding, anaerobic pyrolysis, aerobic pyrolysis, high-temperature crushing, replacement reaction, dissolution and impurity removal, MVR (Mechanical Vapor Recompression) evaporation, centrifugal separation and pneumatic drying on industrial waste salt from top to bottom to finally obtain sodium sulfate crystals, the anaerobic pyrolysis adopts a rotary kiln baking type or spiral tube baking type heating mode, the pyrolysis time is 30-120 minutes, and the pyrolysis temperature is 400-650 DEG C; the aerobic pyrolysis adopts a chain plate type reactor, ceramic fiber cloth is attached to the upper part of a chain plate of the chain plate type reactor, a heating device is arranged at the lower part of the chain plate, the aerobic pyrolysis time is 10-60 minutes, and the pyrolysis temperature is 500-700 DEG C; the TOC of the waste salt after aerobic pyrolysis is 50 to 800 ppm, and the TOC of the waste salt after anaerobic pyrolysis is 200 to 5000 ppm. The application and treatment range of the waste salt is wide, and after the industrial waste salt is subjected to resource treatment, the product is the industrial II-class first-grade sodium sulfate salt, and the product quality is excellent.
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Description

technical field

[0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for recycling industrial waste salt. Background technique

[0002] Industrial waste salt refers to the by-product crystalline salt produced in the industrial production process, mainly produced in pesticides, fine chemicals, medicine, printing and dyeing, coal chemical industries and other industries. There are two main ways of producing industrial waste salt: one is the evaporation and crystallization of high-salt wastewater in the process of water treatment (pure water preparation, reclaimed water reuse, wastewater concentration), and the other is precipitation due to chemical reactions in the production process. Due to the different production methods and processes of industrial waste salt, it will produce mixtures containing different salt components, which are of various types, complex components, and organic matter. They have the charac...

Claims

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