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Method for recycling hexavalent chromium in electrolytic manganese production tail end wastewater

A recycling method and electrolytic manganese technology, applied in chemical instruments and methods, chromium compounds, neutralized water/sewage treatment, etc., can solve problems such as waste, achieve recycling, reduce labor intensity, and reduce operators.

Inactive Publication Date: 2012-06-27
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a method for recovering chromium ions from electrolytic manganese production terminal wastewater. The method of the present invention can separate and recover most of the chromium ions from electrolytic manganese wastewater, and at the same time, it can overcome the accumulation of waste slag and resources generated by the existing treatment technology. Waste problem, realize the organic combination of waste water treatment and resource recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 100mL (dry weight 37.67g) SO 4 2- The type anion exchange resin is loaded into a glass exchange column (Φ28×350mm). The electrolytic manganese wastewater was treated with H 2 SO 4 Adjust the pH to 3, pass through the anion exchange column at a flow rate of 6BV / h, the water volume treated by a single column can reach 210BV, and the Cr in the raw wastewater 6+ The concentration of Cr is 209.7mg / L, after treatment with anion exchange resin, Cr 6+ The concentration is much lower than 0.05mg / L, Cr 6+ The dynamic working exchange capacity is 116.85mg / g, and the removal rate can reach 99.95%. After the anion exchange column is adsorbed and saturated, use 1mol / L NaOH to regenerate through the resin bed at a flow rate of 3BV / h. In the 3BV regeneration solution, Cr 6+ The maximum concentration is 28.62g / L, and its average concentration can reach 19.37g / L, converted into K 2 Cr 2 o 7 It is 54.76g / L, and after simple treatment, it can meet the requirements of the passivati...

Embodiment 2

[0027] According to the operating steps in Example 1, Cr in the original wastewater 6+ The concentration of the water is 206.8mg / L, adjust the pH of the influent water to 4, and pass through the anion exchange column at a flow rate of 6BV / h. The water volume treated by a single column can reach 212BV. After being treated with anion exchange resin, Cr 6+ The concentration is much lower than 0.05mg / L, and the effluent can be stably discharged up to the standard. Then Cr 6+ The dynamic working exchange capacity is 115.98mg / g, and the removal rate can reach 99.65%.

Embodiment 3

[0029] According to the operating steps in Example 1, the 1.0 mol / L NaOH used as the regenerant in the chromium regeneration process in Example 1 was changed to 1.5 mol / L NaOH used as the regenerated agent. Cr in the 2.5BV regeneration solution 6+ The maximum concentration is 35.82g / L, and the average concentration can reach 24.24g / L. After simple treatment, it can be reused as a passivation solution. After the 3rd BV, the regeneration solution starts to contain a large amount of NaOH and a small amount of Cr 6+ , which can be applied to the next batch of regeneration operations. After the above-mentioned resin regeneration operation, the regeneration rate, that is, the recovery rate of chromium was 99.2%.

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Abstract

The invention provides a method for recycling hexavalent chromium in electrolytic manganese production tail end wastewater, which comprises the following steps of: filtering electrolytic manganese production tail end wastewater and adjusting pH to be between 3 and 4; enabling anion exchange resin to adsorb Cr<6+> in the wastewater by an exchange column filled with the anion exchange resin under the conditions of the temperature of 10-50 DEG C and the flow rate of 3-6BV / h; when the anion exchange resin is saturated after adsorbing Cr<6+>, using NaOH as a regenerant and regenerating the anion exchange resin by the exchange column under the condition of the flow rate of 3-4BV / h. By utilizing the method of the invention, after the electrolytic manganese production tail end wastewater is processed, the discharge water is colorless and transparent and the chromium ion concentration approaches zero and is far lower than a discharge threshold value specified by the nation. Meanwhile, chromiumions in the wastewater can be separated and recycled, and the recovery rate is not less than 99 percent, 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 a resource recycling technology of chromium ions in the waste water at the end of electrolytic manganese production, in particular, selectively recycles and utilizes the chromium ions in the waste water by using an ion exchange resin. Background technique [0002] Electrolytic manganese is an important industrial raw material, widely used in metallurgy, chemical industry, light industry, electronic materials and other departments, 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. The sources of these production wastewater are mainly the wastewater generated by the passivation process for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G37/00C02F1/66C02F1/42
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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