Method for separating copper from lead through vacuum distillation of copper scum

A technology of distillation separation and copper scum, applied in the direction of improving process efficiency, etc., can solve the problems of incomplete separation of copper and lead, few types and quantities, and small environmental pollution, etc., and achieve flexible adjustment of production scale, less types and quantities , the effect of little environmental pollution

Inactive Publication Date: 2012-09-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for separating copper and lead by vacuum distillation of copper scum for the problems of high energy consumption, heavy environmental pollution, incomplete separation of copper and lead in the current copper scum treatment process and method. The method has the advantages of few types and quantities of auxiliary materials added, simple process, short process, complete separation of copper and lead, low energy consumption, and a treatment method for copper dross with little environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put 1.52kg of copper scum (main chemical composition: Pb 65.17%, Cu 17.82%, S 5.82%, As 3.84%, Sb 2.65%) in a vacuum environment, press it into a block, and then press it at a pressure of 20Pa and a temperature of Distilled and separated at 900°C for 180 minutes, Pb and PbS in the copper scum enter the gas phase under distillation, and crude lead is obtained after condensation; Cu in the copper scum 2 S and Cu remain in the distillation residue matte, thereby realizing the separation of copper and lead in copper dross. The composition of product crude lead and matte is shown in Table 1:

[0024] Table 1 Chemical composition of copper dross vacuum distillation products

[0025] project Pb, % Cu,% crude lead 90.33 0.16 Matte 0.48 77.71

Embodiment 2

[0027] Put 1.54kg of copper scum (main chemical composition: Pb 74.81%, Cu 13.43%, S 5.47%, As 1.38%, Sb 0.57%) in a vacuum environment, and add 4% of the mass of copper scum with a particle size of Reductant coke powder below 150 mesh, and distilled and separated for 160 minutes under the conditions of pressure of 5 Pa and temperature of 1000 ° C, Pb and PbS in copper scum enter the gas phase under distillation, and crude lead can be obtained after condensation; Cu in copper dross 2 S and Cu remain in the distillation residue matte, thereby realizing the separation of copper and lead in copper dross. The composition of product crude lead and matte is shown in Table 2:

[0028] Table 2 Chemical composition of vacuum distillation products of copper dross

[0029] project Pb, % Cu,% crude lead 93.48 0.27 Matte 0.36 70.32

Embodiment 3

[0031] Put 1.49kg of copper scum (main chemical composition: Pb 72.42%, Cu 12.16%, S 3.53%, As 2.46%, Sb 3.48%) in a vacuum environment, and add 2% of the mass of copper scum with a particle size of 140-mesh reducing agent coke powder, and distilled and separated for 75 minutes under the conditions of pressure 200Pa and temperature 1200°C, Pb and PbS in copper scum enter the gas phase under distillation, and crude lead can be obtained after condensation; copper scum Cu in slag 2 S and Cu remain in the distillation residue matte, thereby realizing the separation of copper and lead in copper dross. The composition of product crude lead and matte is shown in Table 3:

[0032] Table 3 Chemical composition of vacuum distillation products of copper dross

[0033] project Pb, % Cu,% crude lead 95.77 0.31 Matte 0.31 72.81

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Abstract

The invention provides a method for separating copper from lead through vacuum distillation of copper scum. The method comprises the following steps of: holding the copper scum in a vacuum environment; performing distillation separation under the conditions of pressure intensity of 5-200 Pa and temperature of 900-1,300 DEG C for 30-180 minutes; getting Pb and PbS in the copper scum in a gas phase under distillation and condensing to obtain lead bullion; and remaining Cu2S and Cu in the copper scum in distillation residue copper matte, thereby realizing separation of copper and lead in the copper scum. The method has the advantages of less types and number of added auxiliary materials, simple process, short flow, complete separation of copper and lead, low energy consumption, low environmental pollution and capabilities of flexibly adjusting production scale and easily realizing industrial production.

Description

technical field [0001] The invention belongs to the technical fields of nonferrous metal metallurgy and vacuum metallurgy, and relates to a method for separating copper and lead in copper dross by vacuum distillation. Background technique [0002] Copper scum is a by-product of the copper removal process of crude lead pyro-refining. The output is about 2% of the crude lead, which contains 5-25% Cu, 55-80% Pb and a small amount of Fe, S, Sn, Bi, As, Sb, Au, Ag and other elements. At present, most factories use the soda-iron filing method to process copper scum to recover copper, lead and precious metals. They can also use wet processes such as acid leaching, ammonia leaching, and alkali leaching to treat copper scum. scum. [0003] When the soda-iron filings smelting method is used to process copper dross, soda ash, iron filings, coke powder or pyrite and other raw materials need to be added for smelting. The problem of incomplete separation of copper and lead and lead poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B5/16C22B13/00C22B15/00
CPCY02P10/20
Inventor 陈为亮王成旭宋宁王迎爽张殿彬戴永年邓勇刘永成
Owner KUNMING UNIV OF SCI & TECH
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