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Method for treating pentavalent vanadium in wastewater by using ferrophosphorus slag

A technology for treating wastewater and pentavalent vanadium, applied in chemical instruments and methods, multi-stage water/sewage treatment, reduced water/sewage treatment, etc., can solve problems such as high cost and unfriendly environment, and achieve low cost and reduced treatment High cost and comprehensive benefits

Pending Publication Date: 2022-08-02
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the shortcomings of traditional vanadium wastewater treatment methods such as high cost and unfriendly environment, and proposes a method of using phosphorus iron slag as a reducing agent to treat pentavalent vanadium wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] There is a certain pentavalent vanadium electroplating waste liquid, and the content of pentavalent vanadium in the analysis of pentavalent vanadium-containing wastewater is 2 g / L. Sulfuric acid (mass fraction of 98%) was added to the feed solution, and the amount was 2 times of the vanadium content. The ground ferrophosphorus slag is added to the above-mentioned feed solution, and the dosage of the ferrophosphorus slag is 0.5 times of the vanadium content. After stirring the reaction at 50° C. for 1 hour, sodium hydroxide was added to adjust the pH value of the feed solution to 8. The obtained feed liquid was aged for 24 hours, and filtered to obtain the processed feed liquid and filter residue. The analysis found that the reduction rate of pentavalent vanadium in the waste liquid was over 99%.

Embodiment 2

[0022] There is a certain pentavalent vanadium waste liquid, and the content of pentavalent vanadium in the analysis of pentavalent vanadium-containing waste water is 1 g / L. Sulfuric acid (mass fraction of 98%) was added to the feed liquid, and the amount was 8 times of the vanadium content. The ground ferrophosphorus slag is added to the above-mentioned feed solution, and the dosage of the ferrophosphorus slag is 1 times that of vanadium. After stirring and reacting at room temperature for 2 hours, sodium hydroxide was added to adjust the pH value of the feed solution to 12. The obtained feed liquid was aged for 24 hours, and filtered to obtain the processed feed liquid and filter residue. The analysis found that the reduction rate of pentavalent vanadium in the waste liquid was over 99%.

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PUM

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Abstract

The invention belongs to the field of industrial wastewater treatment, and particularly relates to a method for treating pentavalent vanadium in wastewater. The method comprises the following steps: adding a by-product ferrophosphorus slag in an electrothermal reduction step of yellow phosphorus industry into acidified pentavalent vanadium wastewater, reducing pentavalent vanadium through chemical reaction, and then adding alkali to precipitate vanadium so as to achieve the purpose of removing pentavalent vanadium in the wastewater. Aiming at the problems of high cost and low comprehensive benefit of the traditional reduction method, the invention provides a thought of adopting an industrial byproduct as a reducing agent. And meanwhile, conversion and resource utilization of the ferrophosphorus slag can be realized. The method has the characteristics of low cost, simplicity in operation, low equipment requirement, high comprehensive benefit and the like.

Description

technical field [0001] The invention discloses a method for treating pentavalent vanadium in waste water by ferrophosphorus slag, relates to a method for treating pentavalent vanadium in waste water, and belongs to the technical field of industrial waste water treatment. Background technique [0002] Vanadium mainly comes from vanadium-related minerals, such as vanadium magnetite, vanadium-bearing slag, stone coal and vanadium-bearing catalysts. Regardless of the method used to extract vanadium, it is the process of leaching, washing and slagging that produces large amounts of vanadium wastewater. Most of the vanadium compounds in vanadium-containing wastewater are highly toxic high vanadium ions. In addition, the mass fraction of vanadium, residues and other substances extracted from vanadium extraction can reach 13-15%. Improper disposal of solid waste can re-infiltrate the natural environment, resulting in vanadium contamination. The Industrial Vanadium Pollutant Disch...

Claims

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Application Information

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IPC IPC(8): C01B25/37C01G31/00C01G49/02C02F1/70C02F9/04C02F101/20
CPCC01B25/375C01G31/00C01G49/02C02F1/70C02F9/00C02F2101/20C02F2209/06C02F2209/02C02F1/66Y02P10/20
Inventor 赵强罗春晖杨柏斌
Owner SICHUAN UNIV