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Method for separating copper from lead matte and comprehensively utilizing lead matte

A lead matte and copper-rich technology, applied in the field of lead matte, can solve the problems of long process flow, inconvenient operation, high temperature and high pressure, etc.

Inactive Publication Date: 2014-08-27
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can realize the one-step separation of copper in lead matte, but it needs high temperature and high pressure, which brings inconvenience to the operation, and the process is long

Method used

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  • Method for separating copper from lead matte and comprehensively utilizing lead matte

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Break 1kg of lead matte material (Pb 16.58%, Cu 31.94%, S 19.88%, Ag 0.7253%, Fe 18.53%), ball mill to a particle size below 100 mesh, send the ball milled lead matte to the leaching tank, add hydrochloric acid successively Leaching with hydrogen peroxide, the leaching conditions: HCl concentration 3 mol / L, hydrogen peroxide concentration 1.5 mol / L, liquid-solid ratio 3:1, temperature 60°C, stirring speed 300 r / min, reaction time 1h. The leaching rate of copper is 98.5%, while the lead remains in the slag in the form of lead sulfate and lead chloride; the leaching solution is reduced with iron filings, and the reduction conditions are: pH=1, temperature 25°C, and the amount of added iron filings is 2% of the theoretical amount. times, time 1h. The copper reduction rate is 97%, and the purity of sponge copper is 95%.

Embodiment 2

[0014] Break 1kg of lead matte material (Pb 18.82%, Cu 29.09%, S 18.28%, Ag 0.8823%, Fe 20.53%), ball mill to a particle size below 80 mesh, send the ball milled lead matte to the leaching tank, add hydrochloric acid successively Leaching with hydrogen peroxide, the leaching conditions: HCl concentration 4 mol / L, hydrogen peroxide concentration 2 mol / L, liquid-solid ratio 4:1, temperature 80°C, stirring speed 500 r / min, reaction time 2h. The leaching rate of copper is 98%, while the lead remains in the slag in the form of lead sulfate and lead chloride; the leaching solution is reduced with iron filings, and the reduction conditions are: pH=1.5, temperature 25°C, and the amount of iron filings added is 1.5 of the theoretical amount times, time 2h. The copper reduction rate is 97.5%, and the purity of sponge copper is 92.5%.

Embodiment 3

[0016] 1kg of lead matte material (Pb 19..12%, Cu 34.96%, S 17.68%, Ag 0.9614%, Fe 17.53%) is crushed and ball milled to a particle size below 100 mesh, and the ball milled lead matte is sent to the leaching tank. Add hydrochloric acid and hydrogen peroxide successively for leaching, the leaching conditions: HCl concentration 3 mol / L, hydrogen peroxide concentration 2.5 mol / L, liquid-solid ratio 8:1, temperature 70°C, stirring speed 500 r / min, reaction time 2h. The leaching rate of copper is 95.5%, while the lead remains in the slag in the form of lead sulfate and lead chloride; the leaching solution is reduced with iron filings, and the reduction conditions are: pH=1, temperature 25°C, and the amount of added iron filings is 2% of the theoretical amount. times, time 2h. The copper reduction rate is 97%, and the purity of sponge copper is 94.5%.

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Abstract

The invention relates to a method for separating copper from lead matte and comprehensively utilizing lead matte, and belongs to the field of wet metallurgy of non-ferrous metals. The process is characterized by adding hydrogen peroxide under a hydrochloric acid system for oxidization leaching. The method is as follows: ball-milling lead matte blocks until grain size is lower than 100 meshes, and feeding the ball-milled lead matte into a leaching slot for carrying out oxidization leaching, wherein HCl concentration is controlled to 1mol / L-6mol / L, concentration of hydrogen peroxide is controlled to 0.5mol / L-3.5mol / L, a liquid-solid ratio is controlled to (3-10):1, a temperature is controlled to 60-90 DEG C and reaction time is controlled to 1-2 hours. Under a hydrochloric acid condition, hydrogen peroxide is utilized and used as an oxidant for leaching sulfide; in the oxidization leaching process, sulfur in the lead matte is oxidized into elemental sulfur or sulfate radical, copper is oxidized to enter liquor in the form of ion, and lead is left in slag with gold and sliver in the form of lead chloride or lead sulfate. After the leaching process is completed, solid-liquid separation is carried out to realize preliminary separation of copper and lead. Copper-rich leachate can replace deposited copper by adding scrap iron, and leaching residue is returned to a pyrogenic process lead refining system for recycling valuable elements such as lead, sliver, elemental sulfur, and the like.

Description

technical field [0001] The invention relates to a hydrometallurgical process for processing lead matte produced from a lead fire system, and belongs to the field of nonferrous metal hydrometallurgy. Background technique [0002] Lead matte is a co-melt containing lead sulfide, cuprous sulfide, ferrous sulfide and other sulfides in the bottom blowing furnace, reverberatory furnace, blast furnace and enrichment furnace in the lead smelting system. The typical composition is Pb: 10-20 %, Cu: 25-35%, Fe: 15-20%, S: 15-20%. At present, there are two processes for the recovery of valuable elements in lead matte, the fire method and the wet method. Most of the fire methods use the blast furnace method and the reverberatory furnace method to deplete the lead matte to obtain blister copper, which is further refined to obtain However, this method has disadvantages such as incomplete separation of lead and copper, low metal recovery rate, high energy consumption, serious environmental...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B3/46C22B15/00
CPCY02P10/20
Inventor 黄海飞蒋朝金谢兆凤刘万里柴承平谭霖
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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