Treatment technology of acid washing and alkaline washing waste liquid of aluminum substrate
A technology of pickling waste liquid and treatment process, which is applied in the direction of metallurgical wastewater treatment, neutralized water/sewage treatment, reduced water/sewage treatment, etc., to achieve significant social benefits, significant economic benefits, and improve the filtering effect
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[0013] In conjunction with the accompanying drawings and embodiments, the specific process steps of the process of the present invention are further described.
[0014] The treatment process of aluminum substrate pickling and alkali cleaning waste liquid of the present invention, see figure 1 , the following process steps are adopted: pretreatment of aluminum substrate pickling waste liquid and alkaline washing waste liquid respectively - mixing - neutralization - separation - filter cake recycling, and discharge of waste water up to standard.
[0015] In the above steps, the iron removal pretreatment of the pickling waste liquid is carried out by adding reducing agents such as sulfite, sulfur dioxide, hydroxylamine hydrochloride or ascorbic acid to the pickling waste liquid. 0.5~10h, so that the harmful impurity Fe 3+ Convert to Fe 2+ , and then finely filtered to remove dust particles in the pickling waste liquid to obtain refined pickling waste liquid. Among them, degrea...
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