Waste water processing method during heavy metal compound production process

A production process and wastewater treatment technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, heating water/sewage treatment, etc., can solve problems such as high energy consumption of evaporation process and surface water pollution in the research and development stage, To achieve the effect of simple and easy method

Inactive Publication Date: 2012-02-01
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the ion exchange method is that the one-time investment is relatively large, and the regeneration cost is high; the membrane separation method cannot completely remove the salt component; the electrolysis method is currently difficult to treat wastewater containing heavy metals and is still in the research and development stage; the ordinary evaporation process consumes a lot of energy
Most enterprises generally only use simple sedimentation tanks to treat heavy metal ions in wastewater, adjust the pH value, and then discharge them after mixing with domestic sewage. The salt concentration exceeds the standard, which will pollute surface water bodies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add ammonium sulfide and ammonium bicarbonate to the cobalt carbonate wastewater as precipitant, polyacrylamide as flocculant, and filter and separate the wastewater into cobalt precipitate and ammonium chloride solution containing ammonium bicarbonate. Sales; ammonium chloride solution containing ammonium bicarbonate is almost completely converted into ammonium chloride solution without introducing other impurities. The ammonium chloride solution is concentrated by multi-effect evaporation to obtain evaporative condensate and ammonium chloride concentrate, and the condensate is cooled and crystallized and centrifuged to obtain crystallized ammonium chloride that can be sold outside; the evaporative condensate is relatively pure and can be used for cobalt carbonate of wash water.

Embodiment 2

[0021] When preparing the precursor of multi-element materials for the positive electrode of lithium batteries, the heavy metal compound is a mixture of cobalt, nickel and manganese compounds and a small amount of compounds such as iron, zinc, copper, vanadium, chromium, etc., sodium hydroxide is added to the wastewater as a precipitant, polyacrylamide The mixture with polyaluminum chloride is used as a flocculant, and after filtration and separation, the wastewater is divided into heavy metal precipitation such as cobalt, nickel, manganese, iron, copper, and a solution containing sodium salts such as sodium chloride or sodium sulfate and a small amount of free ammonia. Evaporate the free ammonia in the solution, and finally carry out multi-effect forced circulation evaporation concentration and separation.

Embodiment 3

[0023] When the heavy metal compound is cobalt oxide, sodium sulfide is added to the wastewater as a precipitant, and polyacrylic acid, sodium polyacrylate and calcium polyacrylate are used as flocculants. After filtering and separating into cobalt precipitates, the wastewater containing sodium chloride or sodium sulfate and other sodium salts is obtained. solution, the latter is directly concentrated and separated by multi-effect forced circulation evaporation.

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PUM

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Abstract

The invention discloses a waste water processing method during a heavy metal compound production process, and specifically relates to a waste water processing method during a lithium ion battery cathode material producing process. According to the invention, a precipitating agent and a flocculating agent are added into heavy metal compound production waste water; the mixture is filtered and separated, such that heavy metal precipitate and a high-concentration salt solution are obtained; the high-concentration salt solution is processed through multiple-effect evaporation, condensation, and separation, such that inorganic salt crystals can be obtained; and residue waste water can be discharged into a city sewage processing system. With the method, heavy metal ions can be effectively precipitated and recovered, and ammonia nitrogen and other high-concentration salt ions can be removed and recovered. The method is simple, and the cost is low. With the method, waste water can satisfy a standard for being discharged into the city sewage processing system.

Description

technical field [0001] The invention relates to a method for treating waste water in the production process of heavy metal compounds, in particular to a method for treating heavy metal waste water produced in the process of preparing positive electrode materials for lithium ion batteries. Background technique [0002] During the preparation of the precursor of the cathode material for lithium-ion batteries, wastewater containing heavy metal ions and NH 4 + 、Na + 、K + , SO 4 2- , Cl - , NO 3 - high-concentration saline solution. Excessive salt concentration in the water body after wastewater discharge will lead to eutrophication of the water body, deterioration of water resources, salinization of the land, etc., and will also have a certain impact on human health. [0003] The above-mentioned wastewater generally needs to be discharged into urban sewage treatment plants for treatment. According to regulations, wastewater discharged into urban sewage treatment plants...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/52C02F1/04C02F101/20
Inventor 刘亚飞李凤娟陈彦彬邰万兵
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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