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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 electrol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1: 100mL of sodium carboxylic acid structure macroporous weakly acidic cation exchange resin with a cross-linking degree of 4 and a particle size of about 100 μm was loaded into a glass exchange column (Φ28×350mm), and the sedimentation treated Mn 2+ The electrolytic manganese wastewater with a concentration of 149.83mg / L, adjust the pH to 4, and pass through the cation exchange column at a flow rate of 3BV / h. The treated water volume of a single column can reach 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 less than 0.5mg / L. After the cation exchange column is saturated with adsorption, use 0.5mol / L of H 2 SO 4 The flow rate of 24BV / h quickly passes through the resin bed for iterative regeneration. After 6 iterations, the Mn in the regeneration solution 2+ The concentration can be increased to 31.00g / L, which is in...

Example Embodiment

[0020] Example 2: According to the operation steps in Example 1, the 100ml sodium cation exchange resin in Example 1 was changed to another 100ml sodium carboxylic acid structure macroporous with a crosslinking degree of 7 and a particle size of about 500μm Type weakly acidic cation exchange resin, at the same time adjust the pH of the inlet water of the cation exchange column to 6.5, and the inlet water Mn 2+ The concentration is 500.00mg / L, in Mg 2+ When the content is less than 100mg / L (the resin in Example 1 has strong selectivity to manganese, the adsorption of manganese by the resin in Example 2 will be similar to the high concentration of Mg in the wastewater. 2+ Produce competitive adsorption), the water treatment capacity of a single column 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 less than 0.5mg / L. After the cation excha...

Example Embodiment

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

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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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