Method for removing organic matter in zinc hydrometallurgy raffinate

A technology for hydrometallurgy zinc and raffinate, applied in the field of hydrometallurgy, can solve the problems of inability to completely decompose or completely remove organic substances, ineffective removal, zinc electroplating hazards, etc., and achieve complete removal of organic substances and simple operation. , Efficient removal effect

Active Publication Date: 2015-11-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above methods can partially remove the organic matter in the zinc hydrometallurgy raffinate, each has its own advantages, but the common disadvantage is that it cannot completely decompose or completely remove the organic matter remaining in the raffinate
Although this method can remove kerosene in the raffinate and remove harmful arsenic ions and cadmium ions, it cannot effectively remove extractants such as di(2-ethylhexyl) phosphoric acid and tributyl phosphate and ethyl phosphate remaining in the solution. base xanthate, fatty acid, hydroxamic acid and other beneficiation agents, and the accumulation of these residual organic substances will bring serious harm to zinc electrowinning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method for removing organic matter from the zinc wet smelting raffinate, its specific steps are as follows: first, 40L of the zinc wet smelting raffinate (after air flotation and active carbon adsorption, P204 content is 35ppm, ethyl xanthate content is 10ppm , fatty acid is 5ppm, Fe 3+ 0.2g / L, Fe 2+ 15g / L, Zn76g / L) into the reactor, adding ferric sulfate to the zinc hydrometallurgy raffinate to make Fe 3+ The concentration is 5g / L~8g / L, and then the temperature of the reactor is controlled at 160°C, and the oxygen partial pressure is maintained at 0.8MPa to react for 4 hours, and then the wet zinc smelting raffinate with organic matter removed can be obtained. After the reaction, the content of P204 in the zinc hydrometallurgy raffinate is 4.0ppm, the content of ethyl xanthate is 0.5ppm, and the fatty acid is less than 0.5ppm.

Embodiment 2

[0024] The method for removing organic matter from the zinc wet smelting raffinate, its specific steps are as follows: first 40L of the zinc wet smelting raffinate (after air flotation P204 content is 60ppm, ethyl xanthate content is 15ppm, Fe 3+ 0.1g / L, Fe 2+ 6g / L, Zn16.5g / L) into the reactor, adding ferric sulfate to the zinc hydrometallurgy raffinate to make Fe 3+ The concentration is 1g / L~3g / L, and then the temperature of the reactor is controlled at 185°C, and the oxygen partial pressure is maintained at 0.15MPa to react for 4 hours, and then the wet zinc smelting raffinate with organic matter removed can be obtained. After the reaction, the P204 content in the zinc hydrometallurgy raffinate was 3.0 ppm, and the ethyl xanthate content was 1.2 ppm.

Embodiment 3

[0026] The method for removing organic matter from the wet zinc smelting raffinate, its specific steps are as follows: first, 40L of the wet zinc smelting raffinate (after air flotation P204 content is 37ppm, hydroxamic acid content is 25ppm, Fe 3+ 0.08g / L, Fe 2+ 12.7g / L, Zn65.9g / L) into the reactor, adding ferric sulfate to the zinc hydrometallurgy raffinate to make Fe 3+ The concentration is 3g / L~6g / L, and then the temperature of the reactor is controlled at 205°C, and the oxygen partial pressure is maintained at 0.4MPa to react for 3 hours, and then the wet zinc smelting raffinate with organic matter removed can be obtained. After the reaction, the content of P204 in the zinc hydrometallurgy raffinate is 4.0ppm, and the hydroxamic acid is less than 1ppm.

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Abstract

The invention relates to a method for removing organic matter in zinc hydrometallurgy raffinate and belongs to the technical field of hydrometallurgy. The method includes the steps that firstly, the zinc hydrometallurgy raffinate is added to a reaction still; ferric salt is added to the zinc hydrometallurgy raffinate to make the concentration of Fe3+ greater than 1g / L; and the reaction still is controlled to perform a reaction for 2-4 h at the temperature of 160-220 DEG C and with the oxygen partial pressure of 0.15-0.8 MPa, and then zinc hydrometallurgy raffinate with organic matter removed can be obtained. According to the method, O2 is adopted as an oxidizing agent, Fe3+ is adopted as a catalyst, and residual organic matter in the raffinate is subjected to oxidative decomposition at a high temperature, and is removed under the adsorption effect of ferric hydroxide and iron trioxide generated by oxidization of iron ions, so that the purpose of removing an extraction agent is achieved, and the potential hazard of organic matter to zinc electrowinning is avoided fundamentally.

Description

technical field [0001] The invention relates to a method for removing organic matter from zinc hydrometallurgy raffinate, belonging to the technical field of hydrometallurgy. Background technique [0002] In the zinc hydrometallurgy process, the comprehensive recovery process of valuable metals such as zinc, indium, gallium and germanium produces raffinate. The residual extraction agent and mineral processing agent in the raffinate will cause the burning phenomenon of the electrowinning process and affect the zinc production process. Electrowinning current efficiency seriously endangers production. Therefore, it is very important to efficiently remove residual organic matter in the raffinate. [0003] The current methods for removing organic matter in the raffinate are: [0004] (1) Air flotation method [0005] The air flotation method uses the hydrophobicity of the organic matter in the solution to introduce bubbles of a certain size into the solution, so that the organ...

Claims

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Application Information

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IPC IPC(8): C22B19/20C22B3/44
CPCY02P10/20
Inventor 魏昶李兴彬邓志敢李存兄樊刚李旻廷
Owner KUNMING UNIV OF SCI & TECH
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