Zero sludge and resource handling arrangement and recovery method of heavy metal waste water

Abstract

The invention relates to a treatment device and a recovery method for zero sludge resource recovery of heavy metal wastewater, the heavy metal wastewater which mainly contains copper is coagulated and sedimented chemically, after that, sludge with high-concentration copper ions is formed by concentration, the heavy metal sludge is dipped in mixed liquid of sulfuric acid and hydrogen peroxide, thereby obtaining impregnation liquid with the high-concentration copper ions; ammonia water is further used for adjusting the pH value of the impregnation liquid, the selective impregnation is carried out, ammonia copper solution and residues which are rich in iron or aluminium can be obtained after the solid-liquid separation, the ammonia copper solution is done with the procedure of heating and ammonia distillation, then copper oxide and ammonia with very high utilization values can be obtained by recovery, wherein, the generated residues are recovered to be directly added in a rapid mixing tank during the wastewater treatment process as a coagulating agent, the harmless treatment is carried out by wet treatment, or the resource recovery is carried out by using the dry smelting method to recover the iron or the aluminium, and the generated ammonia during the procedure of heating and ammonia distillation can be recovered and reused. The purposes of zero sludge, zero waste and zero emission output can be achieved.

Description

Technical field [0001] The present invention relates to a zero-sludge resource treatment device and recovery method for heavy metal wastewater, especially in the printed circuit board industry and electroplating industry, providing copper-based heavy metal wastewater through chemical coagulation precipitation, concentration formation After the copper-containing heavy metal sludge is immersed and recovered, the copper-containing sludge is immersed and extracted with a mixture of dilute sulfuric acid and hydrogen peroxide, and selectively impregnated with ammonia to separate valuable metals from iron or aluminum. , And then use the heating method to recover ammonia water and produce high-purity copper oxide; the residue produced at the same time can replace the coagulant added in the original wastewater treatment process or undergo hydrometallurgical treatment, or recycle iron or aluminum by smelting. To achieve the goal of zero sludge, zero waste, and zero pollution, taking into ac...

AI Technical Summary

Problems solved by technology

Among the current copper metal recovery and treatment technologies, high-temperature melting and other technologies waste a lot of electricity and heat, and the residues produced are still hazardous wastes; acid liquid (ammonia, sulfuric acid) impregnation, extraction and other technologies are aimed at the impregnation rate of copper-containing sludge. Only reach 60~70%, still produce a large amount of harmful waste residues; Though immobilization technology can turn harmful sludge into harmless and then bury or make floor tiles, but cause the valuable metals (such as copper, copper, etc.) Nickel, zinc, etc.) resource waste

[0012] Therefore, the traditional treatment technology not only cannot improve the recovery rate of copper-containing sludge, but also cannot effectively solve the problem of environmental pollution, and at the same time causes a relatively large burden on the environment and treatment costs

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