Processing method of zinc sulfide concentrate

A technology of zinc sulfide concentrate and acid leaching, which is used in one-stage pressurized acid leaching and two-stage pressurized neutralization to process zinc sulfide concentrate. In order to achieve the effect of large production processing capacity, less loss of zinc metal, and high metal recovery rate

Active Publication Date: 2012-04-18
YUNNAN METALLURGICAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Finally, the amount of slag is large, the l...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The zinc sulfide concentrate with a particle size of 400 mesh was pressurized for a period of time under the conditions of a purity of 99.5% oxygen and a concentration of 130g / l acid, a controlled temperature of 145 degrees Celsius, a pressure of 0.5 MPa and a leaching time of 120 minutes In acid leaching, the zinc leaching rate is 98% and the iron leaching rate is 10%. Then, the one-stage leaching solution is sent to the second-stage autoclave and injected with 99.5% pure oxygen. The temperature is controlled at 140 degrees Celsius, the pressure is 0.8MPa, and the leaching time is 120 minutes. The particle size is 400 mesh vulcanization. The free acid in the zinc concentrate neutralization solution will oxidize and remove the iron as the acidity decreases, resulting in a leachate with a final acid concentration of 4g / L and an iron content of 0.8g / L. At the same time, the leaching residue from the first stage of pressurized acid leaching is sent to sulfur flotation to re...

Embodiment 2

[0054] The zinc sulfide concentrate with a particle size of 420 mesh is pressurized for a period of time under the conditions of a purity of 99.5% oxygen and a concentration of 190g / l acid, a temperature of 150 degrees Celsius, a pressure of 1.5 MPa and a leaching time of 45 minutes. In acid leaching, the zinc leaching rate is 99.5% and the iron leaching rate is 6%. Then, the first stage of the leaching solution is sent to the second stage of the autoclave and injected with 99.5% purity oxygen. The temperature is controlled at 145 degrees Celsius, the pressure is 1.2MPa and the leaching time is 45 minutes. The particle size is 420 mesh. The free acid in the zinc concentrate neutralization solution will oxidize and remove the iron as the acidity decreases, resulting in a leachate with a final acid concentration of 5g / L and an iron content of 0.4g / L. At the same time, the leaching residue from the first stage of pressurized acid leaching is sent to sulfur flotation to recover ele...

Embodiment 3

[0056] The zinc sulfide concentrate with a particle size of -320 mesh is fed with oxygen-enriched air with an oxygen concentration of 90% and an acid with a concentration of 150g / l. The temperature is controlled at 145 degrees Celsius, the pressure is 1.2MPa and the leaching time is 60 minutes. Carry out a stage of pressurized acid leaching, the leaching rate of zinc is 99% and that of iron is 9%. Then, the first stage of the leaching solution is sent to the second stage of the autoclave and oxygen-enriched air with an oxygen concentration of 90% is introduced. The temperature is controlled at 145 degrees Celsius, the pressure is 1.2MPa and the leaching time is 60 minutes. The free acid in the neutralization solution of the 320 mesh zinc sulfide concentrate will oxidize and remove the iron as the acidity decreases, yielding a leachate with a final acid concentration of 4g / L and an iron content of 0.8g / L. At the same time, the leaching residue from the first stage of pressurized...

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Abstract

The invention provides a method used for processing a zinc sulfide concentrate through a first stage pressure acid leaching process and a second stage pressure neutralizing step. The method comprises steps that: (1) oxygen and an acid with a concentration of 110-190g/L are delivered into a zinc sulfide concentrate with a preset particle size; the first stage pressure acid leaching process is carried out, wherein the leaching rate of zinc is no less than 98% and the leaching rate of iron is no more than 10%; (2) an obtained first-stage leaching solution is delivered into a second-stage pressure reactor; oxygen is delivered into the reactor; the zinc sulfide concentrate with a preset particle size is subject to a neutralization reaction, such that free acid in the solution is consumed; with the reduced acidity, iron is oxidized and removed, such that a leaching solution with an acid concentration no more than 5g/L and an iron content no more than 1g/L is obtained. The method provided by the invention is advantaged in simple technology, short technological process, high raw material adaptability, good production capacity, high metal recovery rate, low neutralizer consumption, low production cost, and long machine time. The leaching rate of zinc is no less than 98% and the leaching rate of iron is no more than 10%. 90% of iron is removed with a first-stage leaching slag. A final acid concentration of the leaching solution is no more than 5g/L, and a final iron content is no more than 1g/L.

Description

Technical field [0001] The invention belongs to the field of non-ferrous metallurgy. Specifically, it relates to an improved method for treating zinc sulfide concentrates with one-stage pressure acid leaching and two-stage pressure neutralization. Background technique [0002] In the current zinc sulfide concentrate production process, the traditional two-stage oxygen pressure leaching process of one-stage low-acid leaching and two-stage high-acid leaching is usually adopted. That is, low acid leaching is used in the first stage, the initial acid concentration is 70-80g / L, the zinc leaching rate is 50-70%, the leaching solution is sent to pre-neutralization, iron removal, purification, electrowinning, and the leaching residue enters the second stage High acid leaching. High acid leaching is used in the second stage, the initial acid concentration is about 150g / L, the leaching residue is sent for sulfur selection, and the leaching liquid is returned to the first stage for acid le...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C22B19/20C01B17/06
CPCY02P10/20
Inventor 董英王吉坤毕红兴余继勇毕红林朱绍菊闫江峰张红耀王伟王世宇
Owner YUNNAN METALLURGICAL GROUP
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