Treatment method for aluminum-containing waste salt

Abstract

The invention discloses a treatment method for aluminum-containing waste salt, and relates to the technical field of sewage treatment. The treatment method comprises the steps that the aluminum-containing waste salt is added into a warm aqueous solution to be fully mixed or dissolved, and a solid-liquid mixed solution is obtained; solid-liquid separation is carried out on the solid-liquid mixed solution, and insoluble solid and an aluminum-containing waste salt solution are obtained; the aluminum-containing waste salt solution is placed in an electrolytic cell for performing electrolysis, different corresponding electrolysis parameters are selected according to different pHs of cathode liquor and anode liquor, pure aluminum ions are electrodeposited on the anode and the cathode, and residual liquid is left; an electrodeposited pure aluminum ion product is recovered; and at least a part of residual liquid is recycled into the aluminum-containing waste salt solution. The treatment methodhas the advantage of high deposition efficiency, and realizes effective treatment of recycling of the aluminum-containing waste salt.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for aluminum-containing waste salt. Background technique [0002] With the development of the economy and the deterioration of the water environment, the environmental protection department has formulated stricter sewage discharge standards and stepped up enforcement efforts. In addition to stricter standards for organic matter, increase the standard for salt discharge in wastewater. For example, the total dissolved solids (TDS) discharge limit in the "Beijing Water Pollutant Comprehensive Discharge Standard (DB11 / 307-2013)" category A standard is 1000 mg / Lift. [0003] Currently, the existing disposal technologies are: [0004] 1. The direct thermal combustion method is adopted, that is, the waste salt powder is sprayed into the incinerator, and the organic matter is decomposed and destroyed at a high temperature. However, the melting point of the ...

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Problems solved by technology

[0004] 1. The direct thermal combustion method is adopted, that is, the waste salt powder is sprayed into the incinerator, and the organic matter is decomposed and destroyed at a high temperature. However, the melting point of the general inorganic salt is above 800 degrees Celsius. Melting at a high temperature will cause the incinerator to stick to the wall, Refractory material damage, equipment corrosion, flue blockage and other problems, there is no equipment in normal use at present

[0005] 2. Considering the high-temperature melting of inorganic salts for process improvement, the thermal cracking carbonization process is generally adopted, that is, the waste salt powder is continuously put into the thermal cracking carbonization kiln, and the organic matter in it is lower than the melting point of inorganic salts (below 700 degrees Celsius) and controlled Decomposition and gasification occurs under the condition of oxygen atmosphere, but although this process solves the problem of inorganic salt melting, the organic matter cannot be completely destroyed due to the low thermal cracking temperature, and even due to the uncertainty of the type and content of organic matter in the waste salt, the decomposition gas Changes in concentration are prone to explosion and other safety issues

This method is technically difficult (seepage-proof, waterproof, leak-proof, etc.), occupies a large area, and has high investment costs. There is a risk of secondary environmental hazards caused by geological disasters and other factors.

[0007] To sum up, there is not yet an effective method that can successfully process industrial waste salt, so that it can be processed as a resource

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