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Method for recovering heavy metal in electrolytic manganese passivating wastewater

A technology of electrolytic manganese and heavy metals, applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of waste of useful resources, polluting solid waste, etc., and achieve low production costs, continuous operation, easy-to-handle effects

Inactive Publication Date: 2011-03-30
CHONGQING UNIV
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Problems solved by technology

As for these sludges, they have to be cleaned up every 1 to 2 days, and they can only be piled up after being filtered by a filter press.
In this way, not only new solid wastes that still pollute the environment are produced, but also the useful resources in them are wasted.

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  • Method for recovering heavy metal in electrolytic manganese passivating wastewater
  • Method for recovering heavy metal in electrolytic manganese passivating wastewater

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Embodiment Construction

[0013] The invention discloses a method for recovering heavy metals in electrolytic manganese passivation wastewater, wherein the electrolytic manganese passivation wastewater is electrolytic manganese passivation wastewater containing divalent manganese ions and hexavalent chromium ions. Processing method of the present invention comprises the following steps:

[0014] (1) Add alkali to the electrolytic manganese passivation wastewater to adjust its pH value to 8-12;

[0015] (2) Add soluble carbonate to the electrolytic manganese passivation wastewater that has adjusted the pH value, and stir for 60 to 120 minutes at normal temperature; wherein, the carbonate ion in the soluble carbonate and the electrolytic manganese passivation wastewater The mol ratio of divalent manganese ion is 1.2: 1; Obtain the mixed solution containing manganese carbonate; The chemical equation of this step is: Mn 2+ +CO 3 2- =MnCO 3 ↓

[0016] (3) In the mixed solution containing manganese carb...

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Abstract

The invention relates to a method for recovering heavy metal in electrolytic manganese passivating wastewater. The method mainly comprises the following processes: firstly, regulating the pH value of the electrolytic manganese passivating wastewater by alkali, then adding carbonate into the electrolytic manganese passivating wastewater, filtering after finishing the reaction, regulating the pH value of the solution to 8-12, then adding peroxide and filtering after finishing the reaction; afterwards, regulating the pH value of the solution to 2.0-7.0 and adding quinary-sulfocarbonate to process sexavalent chromium. The invention can recover and utilize manganese and chromium ions in the electrolytic manganese passivating wastewater in a resource way and also can eliminate the generation ofdangerous solid wastes. Compared with the prior art, the invention also has the advantages of low production cost, easy operation, continuous operation and convenient realization of industrialized production.

Description

technical field [0001] The invention relates to a method for harmless treatment and resource utilization of electrolytic manganese passivation wastewater. Background technique [0002] Electrolytic metal manganese contains less impurities and has high purity (more than 99.7% manganese), and is widely used in stainless steel, non-ferrous metal smelting and chemical production processes, and is welcomed by domestic and foreign markets. However, since the electrolytic metal manganese is extremely easy to oxidize, after obtaining the electrolytic metal manganese, it is necessary to add a process step of passivation treatment. In this way, a large amount of electrolytic manganese passivation wastewater is produced, and there are a large amount of water-soluble heavy metal ions such as divalent manganese and hexavalent chromium in the electrolytic manganese passivation wastewater. If the electrolytic manganese passivation wastewater is directly discharged without treatment, it wi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62C02F1/64C02F103/16
Inventor 刘作华孙大贵陶长元杜军刘仁龙曹洪斌
Owner CHONGQING UNIV
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