Method for treating manganese-containing wastewater

A treatment method and wastewater technology, which is applied in metallurgical wastewater treatment, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of non-direct discharge, increased operating cost, high cost, etc., and achieve less raw material consumption and manganese removal The effect of high efficiency and low cost

Inactive Publication Date: 2016-09-28
贵州金瑞新材料有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and easy to implement, but the excessive lime and other alkaline substances added make the solution after manganese removal alkaline and cannot be discharged directly, and the product after manganese removal contains more unreacted lime, which requires excessive acid consumption. , so that the method cannot be used economically
The carbonate manganese removal method needs to be carried out at a temperature greater than 20°C, and the pH needs to be controlled at 8.8-9, and the amount of carbonate used is more than 200% of the theoretical amount. Consumption of a large amount of reagents, high operating costs
Ion exchange method for manganese removal or membrane treatment of manganese-containing wastewater requires the use of a large number of ion exchange resins or ultrafiltration membranes, reverse osmosis membranes, etc. The cost of ion exchange resins, ultrafiltration membranes, and reverse osmosis membranes is relatively high, which makes the operating costs of these methods Increased height, limited application

Method used

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  • Method for treating manganese-containing wastewater

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Effect test

Embodiment 1

[0028] A kind of processing method of manganese-containing waste water of the present invention, process flow chart is as figure 1 shown, including the following steps:

[0029] (1) Determination of Mn in the manganese-containing waste water to be treated (washing water produced in the electrolytic manganese process) 2+ The concentration is 200mg / L;

[0030] (2) Get 200L of manganese-containing wastewater to be treated and put it into the reactor, then add 360mL of ammoniacal liquor with a concentration of 17%, and adjust the pH value of the manganese-containing wastewater to 6.5;

[0031] (3) Under the condition of stirring, in the manganese-containing waste water after step (2) process, pass into the electrolytic manganese production process and adopt the sulfuric acid leaching to produce containing CO 2 exhaust gas (CO in the exhaust gas 2 Concentration is 10%), the flow velocity of feeding waste gas is 20L / min, the time of feeding gas is 85min (the feeding amount of car...

Embodiment 2

[0033] A treatment method for manganese-containing wastewater of the present invention, comprising the following steps:

[0034] (1) Determination of Mn in the manganese-containing waste water to be treated (washing water produced in the electrolytic manganese process) 2+ The concentration is 4200mg / L;

[0035] (2) Get 200L of manganese-containing wastewater to be treated and add it to the reactor, then add 1709g quicklime to adjust the pH value of the manganese-containing wastewater to 7.5;

[0036] (3) Under the condition of stirring, in the manganese-containing waste water after the step (2) is processed, pass into the CO containing CO produced by the boiler combustion 2 exhaust gas (CO in the exhaust gas 2 Concentration is 8%), the flow velocity of passing into waste gas is 100L / min, the time of passing into gas is 214min (the feeding amount of carbon dioxide is 5 times of theoretical amount), after the reaction is finished, the solution is carried out using vacuum sucti...

Embodiment 3

[0038] A treatment method for manganese-containing wastewater of the present invention, comprising the following steps:

[0039] (1) Determination of Mn in the manganese-containing waste water to be treated (slag field permeate in the electrolytic manganese process) 2+ The concentration is 25000mg / L;

[0040] (2) Get 200L of manganese-containing wastewater to be treated and add it to the reactor, add 10L of ammonia water with a concentration of 17%, and then add 7462g of quicklime in batches to adjust the pH value of the manganese-containing wastewater to 7.8;

[0041] (3) Under the condition of stirring, in the manganese-containing waste water after the step (2) is processed, pass into the CO containing CO produced by the boiler combustion 2 waste gas (the feed rate of carbon dioxide is 1.5 times of theoretical amount), after the reaction finishes, the solution is carried out solid-liquid separation using a thickener to obtain manganese carbonate solid and manganese removal so...

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Abstract

The invention discloses a method for treating manganese-containing wastewater, which comprises the following steps: (1) adding alkaline substances into the manganese-containing wastewater; (2) stirring the manganese-containing wastewater into 2 The gas is passed into manganese-containing waste water for reaction; (3) after the reaction is completed, solid-liquid separation is carried out to obtain manganese carbonate solid and manganese removal solution. The treatment method of the manganese-containing wastewater of the present invention is to treat waste by using waste, adopting sulfuric acid leaching in the production process of electrolytic manganese or the waste gas containing carbon dioxide produced by boiler combustion in the production process of electrolytic manganese, and adding a small amount of alkaline substances, the waste gas containing The effective recovery of manganese resources in manganese wastewater has a certain economic value; at the same time, the manganese removal solution produced can be returned to the production of electrolytic manganese, electrolytic manganese dioxide or electrolytic manganese tetraoxide for reuse, and no waste is generated in the whole process, protecting the environment.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a treatment process for manganese-containing waste water produced in the production process of hydrometallurgy (such as electrolytic manganese and electrolytic manganese dioxide). Background technique [0002] In recent years, my country's electrolytic manganese industry has developed rapidly and its production capacity has expanded rapidly, making my country the world's largest producer, exporter and consumer of electrolytic manganese. At present, electrolytic manganese is mainly produced by leaching manganese carbonate ore with sulfuric acid. During the leaching process, a large amount of carbon dioxide-containing gas is produced, which is directly discharged into the air. In the process of electrolytic manganese production, a large amount of manganese-containing wastewater such as plate washing wastewater, flushing tank surface wastewater, ground flushing water, plate and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/20
CPCC02F9/00C02F1/5236C02F1/66C02F2101/206C02F2103/16
Inventor 赵荣波石邦海唐三川黄军武梁幼平吕志伟冉景波李德勇叶万奇宁孝生
Owner 贵州金瑞新材料有限责任公司
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