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Treatment process for recycling chromate waste water in producing electrolytic manganese metal

A technology of electrolytic manganese metal and waste water circulation, which is applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of large alkali consumption and high treatment costs, and achieve a solution to discharge problems, reduction of pollution discharge, saving of construction funds and treatment costs

Active Publication Date: 2013-07-10
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large consumption of activated carbon, acid and alkali, the treatment cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The total chromium concentration from the passivation tank is that 7g / L chromium-containing wastewater is added to the potassium dichromate solution that the total chromium concentration is 32g / L, after mixing, it is a mixed solution A of 15g / L to obtain the total chromium concentration, and the mixed solution A, re-sent to the passivation tank for recycling;

[0013] When there are many impurities in the chromium-containing wastewater from the passivation tank, the chromium-containing wastewater needs to be filtered through a filter press to remove most of the impurities, and then the electrolytic catholyte is added to remove the Cr 6+ reduced to Cr 3+ , after the reaction is complete, the mixed solution B is obtained, and the mixed solution B is sent to the manganese sulfate leaching tank with a pump. The manganese sulfate leaching tank is used to prepare the electrolyte manganese sulfate, and will contain Cr 3+ The manganese solution is sent there and used for catho...

Embodiment 2

[0015] The total chromium concentration from the passivation tank is that 5g / L chromium-containing wastewater is added to the potassium dichromate solution that the total chromium concentration is 30g / L, after mixing, it is a mixed solution A of 13g / L that the total chromium concentration is obtained, and the mixed solution A, re-sent to the passivation tank for recycling;

[0016] When there are many impurities in the chromium-containing wastewater from the passivation tank, the chromium-containing wastewater needs to be filtered through a filter press to remove most of the impurities, and then the electrolytic catholyte is added to remove the Cr 6+ reduced to Cr 3+ , after the reaction is complete, the mixed solution B is obtained, and the mixed solution B is sent to the manganese sulfate leaching tank with a pump. The manganese sulfate leaching tank is used to prepare the electrolyte manganese sulfate, and will contain Cr 3+ The manganese solution is sent there and used fo...

Embodiment 3

[0018] The total chromium concentration from the passivation tank is that 9g / L chromium-containing wastewater is added to the potassium dichromate solution that the total chromium concentration is 35g / L, after mixing, it is a mixed solution A of 17g / L to obtain the total chromium concentration, and the mixed solution A, re-sent to the passivation tank for recycling;

[0019] When there are many impurities in the chromium-containing wastewater from the passivation tank, the chromium-containing wastewater needs to be filtered through a filter press to remove most of the impurities, and then the electrolytic catholyte is added to remove the Cr 6+ reduced to Cr 3+ , after the reaction is complete, the mixed solution B is obtained, and the mixed solution B is sent to the manganese sulfate leaching tank with a pump. The manganese sulfate leaching tank is used to prepare the electrolyte manganese sulfate, and will contain Cr 3+ The manganese solution is sent there and used for catho...

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PUM

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Abstract

The invention discloses a treatment process for recycling chromate waste water in producing electrolytic manganese metal, comprising the following steps: adding a potassium dichromate solution in chromate waste water from a passivation tank to obtain a mixed solution A after mixing, and reputting the mixed solution A into the passivation tank for recycling; when impurity content in the chromate waste water is high, filtering the chromate waste water through a filter press for removing impurities, then adding an electrolytic catholyte and reducing Cr<6+> to Cr<3+> to obtain a mixed solution B after the reaction, and sending the mixed solution B into a manganese sulfate lixiviating tank through a pump for recycling. The concentration of the chromate waste water from the passivation tank is 5-9 g / L, the concentration of the potassium dichromate solution is 30-35 g / L, and the concentration of chromium in the mixed solution A is 13-17 g / L. According to the invention, the chromate waste water is recycled, the discharge problem of the chromate waste water is solved, the construction fund and processing cost are saved, and the pollution discharge capacity to the environment is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment process in chemical production, and in particular relates to a treatment process for recycling chromium-containing waste water in electrolytic manganese metal production. Background technique [0002] In the production process of electrolytic manganese metal, from the manganese sulfate electrolyte, the electrolytically produced manganese metal is attached to the cathode, which is easily oxidized when exposed to the air, so first soak the cathode with manganese metal in the passivation tank for 3 minutes, A dense manganese dioxide film is formed on the outer surface to prevent further oxidation, and the passivation is to convert Mn into MnO 2 oxidation process. The wastewater discharged from the passivation tank contains a large amount of hexavalent chromium, etc., which is the most difficult part of the electrolytic manganese production wastewater. There are three traditional treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C25C1/10
Inventor 卢立祥魏建民王吉刚林韬王志远周明生林彬彬
Owner CHINA TIANCHEN ENG
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