A method for reducing fluoride content in copper concentrate using particle size classification and pulsed voltage

CN116479257BActive Publication Date: 2026-06-30CENT SOUTH UNIV
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Patent Information

Application Number
CN202310457126.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-26
Publication Date
2026-06-30
Estimated Expiration
2043-04-26

AI Technical Summary

Technical Problem

Existing technologies for processing high-fluoride copper concentrate suffer from high costs, significant loss of valuable metals, and low efficiency in removing fluoride ions, especially in the flotation process where it is difficult to effectively reduce the fluoride content in copper concentrate.

Method used

A method combining particle size classification and pulsed voltage was used to separate high-fluoride copper concentrate using a hydrocyclone. A pulsed electric field was applied in the electrolytic cell using a pulsed power supply and an enhancer to drive the removal of fluoride ions. In addition, enhancers such as sodium hydroxide, potassium hydroxide, and ammonia were used to accelerate the electromigration and electrodialysis of fluoride ions, thereby reducing the fluoride content in the copper concentrate.

Benefits of technology

This method achieves low-cost and efficient reduction of fluoride content in copper concentrate, avoids the loss of valuable metals, improves the removal efficiency of fluoride ions, meets the production requirements of downstream smelting industries, and reduces environmental impact.

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Abstract

This invention discloses a method for reducing the fluoride content in copper concentrate using particle size classification and pulsed voltage. The process involves adding high-fluoride copper concentrate to a hydrocyclone for classification, obtaining low-fluoride settling liquid and high-fluoride overflow. The high-fluoride overflow enters the concentrate chamber of an electrolytic cell, where an intensifier is added. Anode liquid is added to the anode chamber, cathode liquid to the cathode chamber, and intermediate liquid to the intermediate chamber. A pulsed power supply is used to apply a DC electric field between the anode and cathode for defluorination. Under the influence of the electric field, negatively charged fluoride ions migrate towards the anode chamber via electromigration, while fluoride, as fluoride or other soluble ions, migrates towards the cathode chamber via electrodialysis, ultimately reducing the fluoride ion concentration in the high-fluoride overflow. After sedimentation and filtration, the defluorinated overflow and low-fluoride settling liquid yield low-fluoride copper concentrate. The advantages of this invention are that it avoids the loss of valuable metals caused by inhibitors inhibiting copper and gold during traditional flotation defluorination of copper concentrate, while also reducing the environmental impact of fluoride ions.
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Citation Information

Patent Citations

  • Method for high-efficiently enriching gold and platinum metal from complex low-grade chlorine soaked slag

    CN103352125A

  • Novel graded preliminary dressing-mixing and grinding-flotation process for improving quality of copper concentrates

    CN110560252A