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Fractional precipitation treatment method of wastewater containing nonferrous metal of nickel, lead and cadmium

A non-ferrous metal, graded precipitation technology, used in flocculation/sedimentation water/sewage treatment, water/sewage multi-stage treatment, chemical instruments and methods, etc. , the effect of protecting the environment

Inactive Publication Date: 2010-03-10
CHANGCHUN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All the non-ferrous metal ions in the wastewater are removed from the water at one time, so that the treated wastewater meets the environmental protection requirements, but the separated non-ferrous metals are a mixture of various metals, which is not easy to recycle.

Method used

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  • Fractional precipitation treatment method of wastewater containing nonferrous metal of nickel, lead and cadmium

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Embodiment Construction

[0021] The waste water is sent to the adjustment tank to balance the water quality and water quantity; the waste water is then lifted to the flocculation sedimentation tank by the lift pump for flocculation and sedimentation. The flocculant is PAM, the mixing time is 3 minutes, the reaction time is 30 minutes, and the surface load of the flocculation sedimentation is 1m 3 / (m 2 h); add lime milk to the waste water in the reaction tank, fully stir, and automatically control the pH value at 8.0 through the pH meter, and then deposit the hydroxide of nickel in the primary sedimentation tank; the primary precipitation Finally, the waste water enters the next reaction tank, and lime milk is added, and the pH value is automatically controlled by a pH meter to control the pH value at 11, and FeSO is added 4 , FeSO 4 The dosage is 15mg / L, and polysilicate iron sulfate is added at the same time. It can remove the remaining nickel ions, lead and cadmium ions in the wastewater.

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Abstract

The invention relates to a fractional precipitation treatment method of wastewater containing nonferrous metal of nickel, lead and cadmium, in particular to a method for treating industrial wastewatercontaining nonferrous metal, comprising the following steps: balancing water quality and water quantity after wastewater enters in a balance tank; raising the wastewater to a coagulation sedimentation tank for coagulation sedimentation; adding limemilk in the wastewater in a reactive tank, controlling the pH value to be 8.0, then settling hydroxide of the nickel in a primary sedimentation tank; adding limemilk into a settlement, controlling the pH value to be 11 and adding FeSO4 and polymeric ferric silicate sulfate, and then settling metal hydroxides in a secondary sedimentation tank. The invention can effectively separate almost all nickel metal from the wastewater to facilitate recycling, and then remove the residual metal ions in the wastewater by adopting a compulsory measure, thereby not only protecting the environment, but also realizing production saving.

Description

technical field [0001] The invention relates to a treatment method for nonferrous metal industrial wastewater, in particular to a treatment method for nickel smelting wastewater containing nickel, lead and cadmium ions. Background technique [0002] my country's non-ferrous metal minerals contain a variety of metals, and most of them are associated ores. The wastewater produced by the non-ferrous metal smelting industry in the production process contains several or more non-ferrous metals. At present, the treatment methods of non-ferrous metal industrial wastewater include electrodialysis, ion exchange, chemical precipitation and so on. All the nonferrous metal ions in the wastewater are removed from the water at one time, so that the treated wastewater meets the environmental protection requirements, but the separated nonferrous metals are mixtures of various metals, which is not easy to recycle. Contents of the invention [0003] The technical problem to be solved by t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/66C02F101/20
Inventor 边德军霍明昕谢忠岩任庆凯田曦李广柱
Owner CHANGCHUN INST OF TECH
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