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Method for recycling manganese ion in electrolytic manganese production tail end wastewater

A recovery method and electrolytic manganese technology, applied in metallurgical wastewater treatment, chemical instruments and methods, ion-exchanged water/sewage treatment, etc., can solve problems such as waste, and achieve the effects of improving stability, reducing operators, and reducing labor intensity

Inactive Publication Date: 2010-09-22
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for recovering manganese ions in electrolytic manganese production terminal waste water. Utilizing the method of the present invention can separate and reclaim most of the manganese ions from electrolytic manganese waste water, and can overcome the accumulation of waste residue and the waste residue generated by the existing treatment technology. To solve the problem of resource waste, realize the organic combination of wastewater treatment and resource recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Put 100mL of sodium-type carboxylic acid structure macroporous weakly acidic cation exchange resin with a cross-linking degree of 4 and a particle size of about 100 μm into a glass exchange column (Φ28×350mm), and pass it through the sedimentation-treated mn 2+ The electrolytic manganese wastewater with a concentration of 149.83mg / L is adjusted to a pH of 4, and the flow rate of 3BV / h passes through the cation exchange column. The single column can treat 170BV (bed volume), Mn 2+ The dynamic working exchange capacity is 25.44mg / mL, and the removal rate can reach 99.89%. The treated effluent is colorless and transparent, Mn 2+ The concentration is lower than 0.5mg / L. After the adsorption and saturation of the cation exchange column, use 0.5mol / L H 2 SO 4 Rapidly pass through the resin bed for iterative regeneration at a flow rate of 24BV / h. After 6 iterations, the Mn in the regeneration solution 2+ The concentration can be increased to 31.00g / L, in line w...

Embodiment 2

[0020] Example 2: According to the operation steps in Example 1, the 100mL sodium-type cation exchange resin in Example 1 was changed to another 100ml sodium-type carboxylic acid macroporous structure with a cross-linking degree of 7 and a particle size of about 500 μm type weakly acidic cation exchange resin, and at the same time adjust the pH of the influent water to the cation exchange column to 6.5, and the influent Mn 2+ The concentration is 500.00mg / L, in Mg 2+ Content is lower than under the condition of 100mg / L (resin has stronger selectivity to manganese in embodiment 1, the adsorption of resin to manganese in this embodiment 2 can follow the Mg of high concentration in waste water 2+ Competitive adsorption), the single-column treatment water volume can reach 80BV, Mn 2+ The dynamic working exchange capacity is 39.92mg / mL, and the removal rate can reach 99.79%. The treated effluent is colorless and transparent, Mn 2+ The concentration is lower than 0.5mg / L. After ...

Embodiment 3

[0021] Embodiment 3: the concentration in embodiment 2 is the H of 1.0mol / L 2 SO 4 The regeneration agent was changed to 1.5mol / L, and the Mn in the regeneration solution 2+ The concentration of the manganese can be concentrated to 48.5g / L, which can be reused in the electrolysis process as the electrolyte to realize the recycling of manganese. The recovery rate can reach 92.8%, and the recovery rate can be increased to 99.5% after one iteration.

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Abstract

The invention provides a method for automatically recycling manganese ions in electrolytic manganese production tail end wastewater, which comprises the following steps of: pretreating stabilized production wastewater and carrying out ion exchange with cation exchange resin; adsorbing till the cation exchange resin is saturated and then adopting H2SO4 with the concentration of 0.5-1.5mol / L as a regenerant; and carrying out desorbing regeneration on the ion exchange resin adsorbed with Mn<2+>. The regenerated regenerating liquid forms MnSO4 with high concentration and meets the requirement of being recycled to the liquid preparation working section of electrolytic manganese production, and regenerating liquid with low concentration is recycled for regenerating operation in next batch. By utilizing the method, after the electrolytic manganese production tail end wastewater is processed, the discharge water is colorless and transparent and the manganese ion concentration approaches zero and is far lower than a discharge threshold value specified by the nation. Meanwhile, manganese ions in the wastewater can be separated and recycled, thereby realizing effective control of the wastewater and recycling of resources and having obvious environmental, economic and social benefits.

Description

technical field [0001] The invention relates to the resource recovery technology of manganese ions in the waste water at the end of electrolytic manganese production. Specifically, it relates to the selective recycling of manganese ions in wastewater using ion exchange resins. Background technique [0002] Electrolytic manganese is an important industrial raw material, widely used in metallurgy, chemical industry, light industry, electronic materials and other sectors, especially in the iron and steel industry - the amount of electrolytic manganese is second only to iron. At present, the production of electrolytic manganese in my country is mainly to prepare manganese sulfate by adding sulfuric acid to manganese carbonate ore, and then obtain it by electrolysis. For every ton of electrolytic manganese produced, about 4 to 5 tons of wastewater are discharged. These production wastewater mainly come from the wastewater generated by the passivation process for cleaning the pla...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/52C02F1/42C02F1/64C02F1/28C02F103/16C02F101/20
Inventor 段宁王璠潘涔轩周长波彭晓成魏健马聪
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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