Zero-emission production process of electrolytic manganese wastewater

A production process and zero-emission technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as environmental hazards, waste of valuable resources, and environmental pollution, and achieve Environmentally friendly effect

Active Publication Date: 2013-09-18
湖南鼎中环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current situation of direct discharge of ammonia nitrogen without treatment, on the one hand, causes serious pollution of surface water and groundwater; on the other hand, ammonia nitrogen is a useful raw material in the production process of electrolytic manganese, and direct discharge leads to waste of valuable resources, which is not compatible with clean production, Contradictory expectations for improved resource utilization
[0003] In addition, manganese and chromium in electrolytic manganese wastewater form hazardous solid waste landfill, which not only has potential harm to the environment, but also is a huge waste of resources
According to statistics, 1 ton of electrolytic manganese products produces at least 14kg of manganese into wastewater or solid waste, polluting the environment

Method used

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  • Zero-emission production process of electrolytic manganese wastewater

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with embodiment.

[0030] This embodiment includes grinding, pulping, compounding, transfer, pressure filtration, electrolysis, passivation, and rinsing processes, and is characterized in that the following steps are also provided:

[0031] (1) Recycling of filter cloth washing water: After the filter cloth washing water generated in the filter press process is filtered through the pipeline filter, it is returned to the cloth washing water pool for recycling;

[0032] When the free manganese concentration of the filter cloth washing water in the cloth washing water pool is 12g / L, pump it into the pulping tank as slurry preparation water for recycling; and add a corresponding amount of clear water to the cloth washing water pool;

[0033] (2) Recycling of rinsing water for plate flushing: the rinsing water (containing [Cr 2 O 7 2- ]50~120mg / L, [NH 3 -N]900~1800mg / L, [Mn 2+ ]900~3000mg / L, SS50~300mg...

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Abstract

The invention provides a zero-emission production process of electrolytic manganese wastewater. The process comprises processes such as grinding, slurrying, chemically combining, transferring, filter pressing, electrolyzing, passivating and rinsing and comprises the following steps of: (1) circularly utilizing filter cloth washing water; (2) circularly utilizing impact plate rinsing water; (3) circularly using polishing liquid washing water of a negative plate; and (4) carrying out other wastewater treatment processes: feeding filter reverse washing water and test water into a slag pool leachate treatment system for centralized treatment. According to the invention, manganese is produced by utilizing the process, no wastewater is emitted, no environment pollution is generated, and clean production can be realized and resource utilization rate is improved.

Description

technical field [0001] The invention relates to a zero-discharge production process of electrolytic manganese wastewater, in particular to a zero-discharge production process of electrolytic manganese wastewater used in a chromium-containing passivation process. Background technique [0002] Electrolytic manganese wastewater has high pollutant concentration and complex composition. At present, electrolytic manganese enterprises generally use the "reduction-neutralization precipitation" method to treat electrolytic manganese wastewater. This method mainly targets manganese and chromium in wastewater, and has almost no treatment effect on ammonia nitrogen in wastewater. In the production process of electrolytic manganese, 1 ton of electrolytic manganese product consumes about 83kg of ammonia, of which about 43kg enters waste water, 37kg enters waste residue, and a total of 96% of the total ammonia nitrogen enters the environment. According to the on-site measurement data of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 钟文毅
Owner 湖南鼎中环保科技有限公司
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