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Process for efficiently and selectively separating copper in lead copper matte

A selective and lead-separating technology, applied in photography technology, photography auxiliary technology, process efficiency improvement, etc., can solve the problems of high temperature and high pressure in process conditions, inconvenient operation, etc., achieve low environmental pollution, low production cost, and short process flow Effect

Inactive Publication Date: 2014-09-03
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can realize the selective leaching of metals and the recovery rate of metals is high, the process conditions require high temperature and high pressure, which brings great inconvenience to the operation.

Method used

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  • Process for efficiently and selectively separating copper in lead copper matte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 500 g of lead matte (Pb 26.58%; Cu 30.94%; S 9.88%; Ag 0.4684%; Fe 12.53%) was crushed, ball milled to a particle size of 70 mesh, and then moved into the leaching tank for leaching with sulfuric acid solution. Sodium chlorate, oxidation leaching copper, control conditions: oxidation potential 500mV, sulfuric acid concentration 1.0 mol / L, sodium chlorate concentration 300 g / L, liquid-solid ratio 6:1, temperature 70 ℃, stirring speed 300 r / min reaction time 3 h, normal pressure. After the leaching is completed, the liquid-solid separation is carried out, and Cu is divided into Cu 2+ After entering the leaching solution, the leaching rate of copper was found to be 93.43% through laboratory analysis, and the leaching slag tempering lead smelting system recovered valuable elements such as Ag and Pb. The silver recovery rate is 99.8%, and the lead recovery rate is >99.6%.

Embodiment 2

[0023] 500 g of lead matte (Pb 25.76%; Cu 29.99%; S 10.28%; Ag 0.5108%; Fe 13.66%) was crushed, ball milled to a particle size of 60 mesh, and then moved into a leaching tank for leaching with sulfuric acid solution. NaClO 3 , oxidative leaching of copper, control conditions: oxidation potential 600mV, sulfuric acid concentration 1.5 mol / L, sodium chlorate concentration 400 g / L, liquid-solid ratio 8:1, temperature 85 ℃, stirring speed 300 r / min, reaction time 5 h, Atmospheric pressure. After the leaching is completed, the liquid-solid separation is carried out, and Cu is divided into Cu 2+ After entering the leaching solution, the leaching rate of copper was found to be 97.88% through laboratory analysis, and the leaching slag tempering lead smelting system recovered valuable elements such as Ag and Pb. The recovery rate of lead and silver is more than 99.5%.

Embodiment 3

[0025] 500 g of lead matte (Pb 27.21%; Cu 30.88%; S 10.15%; Ag 0.4224%; Fe 14.10%) was crushed, ball milled to a particle size of 50 mesh, and then moved into a leaching tank for leaching with sulfuric acid solution. NaClO 3 , oxidative leaching of copper, control conditions: oxidation potential 700mV, sulfuric acid concentration 2.0 mol / L, sodium chlorate concentration 500 g / L, liquid-solid ratio 10:1, temperature 95 ℃, stirring speed 400 r / min, reaction time 5 h, Atmospheric pressure. After the leaching is completed, the liquid-solid separation is carried out, and Cu is divided into Cu 2+ After entering the leaching solution, the leaching rate of copper was found to be 97.65% through laboratory analysis, and the leaching slag tempering lead smelting system recovered valuable elements such as Ag and Pb. Among them, the lead recovery rate is 99.6%, and the silver recovery rate is 99.9%.

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Abstract

The invention discloses a process for efficiently and selectively separating copper in lead copper matte. The process comprises the following steps: smashing and grinding the lead copper matte taken as a raw material and screening to reach below 80 meshes; sending the lead copper matte which is ground and screened into a leaching tank and leaching by using a sulfuric acid; reacting for 3 to 5 hours at a normal pressure under the conditions that the oxidation potential of the solution is controlled within 450mV to 800mV, the concentration of sodium chlorate is controlled within 200g / L to 500g / L, the liquid-solid ratio is controlled within (5-15):1, the temperature is controlled within 70 DEG C to 100 DEG C and the concentration of the sulfuric acid is controlled within 1.0mol / L to 1.5mol / L; and leaching the copper under an acid condition by taking the sodium chlorate as an oxidizing agent. During the oxidizing and leaching process, sulfur in the lead copper matte is oxidized into elemental sulfur which is transferred into slags, wherein copper which is oxidized enters the solution in a form of copper ions while lead remains in the slags in a form of lead sulfate together with gold and silver. After the leaching process is finished, the solid-liquid separation is carried out, so that the primary separation of the copper and other valuable elements is realized; a certain amount of scrap iron is added into the leaching solution rich in the copper so as to replace the deposited copper, so that the spongy copper, which is a primary product, can be obtained; the leaching slags are sent into a pyrogenic lead smelting system, so that the valuable elements such as Pb and Ag are comprehensively recycled.

Description

[0001] technical field [0002] The invention relates to a wet process for efficiently and selectively separating copper from lead matte, belonging to the field of nonferrous metal hydrometallurgy. Background technique [0003] In the smelting process of lead sulfide concentrate, lead matte is produced. It is PbS, Cu 2 The eutectic of sulfides such as S, FeS and ZnS, in addition, it still contains a small amount of Ag 2 S and other metal sulfides also melt part of the metal lead at high temperature. It generally contains 8-45% copper, 5-20% sulfur, 0.1-0.6% silver, 5-50% lead, and 3.0-18% iron. [0004] The composition of lead matte is complex, and the grade of copper is low. Domestically, the fire method is used for processing. Blister copper is obtained by blowing in a copper smelting converter, and then further refined to obtain electric copper. The use of pyrotechnics to treat lead matte has problems such as high energy consumption, low metal recovery rate, seriou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B15/00C25C1/12
CPCY02P10/20
Inventor 蒋朝金谢兆凤黄海飞刘万里谭霖覃小龙
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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