Process for treating aluminum substrate acid cleaning and alkaline cleaning waste liquid

Abstract

The invention relates to a treatment method of industrial waste liquid and discloses a process for treating aluminum substrate acid cleaning and alkaline cleaning waste liquid. The process is mainly characterized by comprising the following steps of: firstly, adding a proper amount of carbonate mineral powder into aluminum-containing acid cleaning waste liquid to perform a replacement reaction, secondly, adding aluminum-containing alkaline cleaning waste liquid into the mixture for neutralization, and finally, separating the mixture to ensure that the waste liquid is discharged after reaching standards, wherein the waste residues are discharged as environment-friendly inorganic insoluble matters or serve as raw materials for producing aluminum. Therefore, the method has the characteristics of using cheap and easily-obtained carbonate ores and all the processed alkaline cleaning waste liquid, normally treating and separating the formed matters, greatly reducing treating cost and solving the technical problem of treating the aluminum-containing acid cleaning and alkaline cleaning waste liquid of small enterprises in the field, and has the advantages of scientific and rational process design, advancement and practicality, economy, obvious social effect and the like.

Description

technical field [0001] The invention belongs to a method for treating industrial waste liquid, and relates to a process for treating aluminum substrate pickling and alkali cleaning waste liquid. Background technique [0002] When the surface treatment of aluminum substrates is carried out, processes such as alkaline cleaning, degreasing, electrolytic roughening, and anodic oxidation are required, resulting in a large amount of aluminum-containing alkaline cleaning waste liquid with a pH of 12.5-13.0 and several times the volume of pH 1.0 -1.6 Aluminium-containing pickling waste liquid must be treated according to environmental protection laws. [0003] The current treatment methods mainly include: (1) mix the aluminum-containing pickling and alkali washing waste liquid, then add liquid caustic soda or other alkaline substances, and add quicklime etc. as filter aids if necessary, adjust to pH 6-9, Separation, waste water discharge, and the resulting filter cake is treated as...

AI Technical Summary

Problems solved by technology

[0004] The main defect of above-mentioned treatment method (1) is: the treatment cost is high, and produces a large amount of new sludge garbage

[0006] The above two treatment methods are not suitable for small-scale production enterprises due to the large treatment costs, high investment, and very little recyclable aluminum hydroxide, which has no recovery value.

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