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Method for comprehensively recovering bismuth, silver and copper metal by taking bullion lead as raw material

A technology of copper metal and lead-bismuth alloy, applied in the direction of non-metal elements, chemical instruments and methods, selenium/tellurium compounds, etc., can solve the problems of high environmental pressure, long process and complicated process, so as to improve the recovery cycle and shorten the recovery The effect of shortening the cycle and shortening the smelting process

Active Publication Date: 2020-12-11
HENAN YUGUANG GOLD & LEAD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The whole process is complex, long process, high cost, low metal recovery rate
At the same time, the treatment of smoke and waste residue in the pyrotechnic process is the most critical. Smoke and waste residue contain a large amount of heavy metals and toxic substances. Pollution is a potential major safety hazard; although wet treatment can avoid the pollution of smoke and dust to the environment, the wet leaching process will produce a large amount of waste acid and waste water that needs to be treated, and it also faces the problem of high environmental pressure

Method used

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  • Method for comprehensively recovering bismuth, silver and copper metal by taking bullion lead as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: described noble lead composition comprises following mass percent: Ag10~65%, Cu8~20%, Bi20~60%, Te4~8%, Pb<10%, Sb<10%; Copper-silver alloy 1: Ag45 ~85%, Cu10~40%, Bi<5%, Te3~10%, Pb<5%, Sb<10%; copper-silver alloy II: Ag45~85%, Cu4~20%, Bi<10%, Te <1%, Pb<10%, Sb<5%; lead-bismuth alloy Ⅰ: Bi50-90%, Te1-8%, Ag0.5-5%, Cu0.1-1%; lead-bismuth alloy Ⅱ: Bi50- 90%, Te<0.3%, Ag0.5~5%, Cu0.5~1%; lead-bismuth alloy III: Bi50-90%, Ag<20g / t, Cu<10g / t. The process is as follows:

[0025] Step 1: First place the precious lead in a discontinuous vacuum furnace, vacuum separate lead, bismuth, gold, silver and copper under the conditions of controlling the vacuum degree of 10-100Pa, the temperature of 1000-1300℃, and the distillation time of 7-9 hours , tellurium, through zonal condensation, the volatile lead-bismuth alloy I and high-tellurium alloy I are produced; the residue copper-silver alloy I;

[0026] Step 2: Put the lead-bismuth alloy I obtained in step 1 in a ...

Embodiment 2

[0033] Embodiment 2: steps and process are identical with embodiment 1, no longer repeat;

[0034] Composition (%) Ag Cu Bi Te Pb Sb precious lead 14.5 11.20 61.50 4.60 5.56 2.50 Copper Silver Alloy I 54.51 30.60 2.00 3.5 0.68 4.80 Copper Silver Alloy II 56.5 8.50 7.55 0.4 3.0 2.10 Lead Bismuth Alloy Ⅰ 2.00 0.3 83.80 4.8 6.90 Lead Bismuth Alloy II 2.50 0.50 85.50 0.05 Lead Bismuth Alloy III <20g / t

Embodiment 3

[0035] Embodiment 3: steps and process are identical with embodiment 1, no longer repeat;

[0036] Composition (%) Ag Cu Bi Te Pb Sb precious lead 63.00 8.20 20.5 4.00 1.10 1.9 Copper Silver Alloy I 78.65 10.20 1.00 3.6 0.02 0.56 Copper Silver Alloy II Lead Bismuth Alloy Ⅰ 2.00 0.2 82.80 2.76 1.33 Lead Bismuth Alloy II 2.8 0.5 83.55 0.1 Lead Bismuth Alloy III <20g / t

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Abstract

The invention relates to a method for comprehensively recovering bismuth, silver and copper metal by taking bullion lead as a raw material. The method is characterized by comprising the following steps of: firstly, selecting an intermittent vacuum furnace for vacuum distillation, separating most copper and silver from lead and bismuth, and simultaneously collecting part of tellurium elements through fractional condensation; removing tellurium from a lead-bismuth alloy through an impurity removal pot, distilling the lead-bismuth alloy through a continuous vacuum furnace to obtain a lead-bismuthalloy with Ag less than 20 g / ton and Cu less than 10 g / ton, and performing fire refining to obtain national standard 4N refined bismuth; performing oxidation refining on a copper-silver alloy generated by the intermittent furnace and a copper-silver alloy generated by the continuous furnace to remove copper, tellurium and the like to obtain a crude silver alloy, and performing electrolytic refining on the crude silver alloy to obtain refined silver; adding an oxidant into copper slag obtained by fire refining for oxidation, converting Cu and Cu2O into CuO, and performing wet leaching to finally recover copper; and performing wet treatment on tellurium slag generated by the intermittent furnace, the impurity removal pot and a fire refining furnace to recover tellurium. The method has the advantages of short process flow and high recovery rate of bismuth and tellurium. The direct recovery rate of bismuth is improved from 60.87% to 74.53%, the recovery rate of tellurium is improved from30% to 50%, and the production cost of each ton of bullion lead is reduced by about 1,100 yuan.

Description

technical field [0001] The invention relates to a method for comprehensively recovering bismuth, silver and copper metals by using precious lead as a raw material, belonging to the field of solid waste recovery and reuse. Background technique [0002] The lead-copper anode slime in the non-ferrous smelting industry is the main raw material for the recovery of rare and precious metals such as gold and silver. In China, the pyroprocessing process is usually adopted. First, the precious lead furnace is reduced and smelted to produce precious lead. The main chemical composition of precious lead is in the metallic state. , Gold, silver, copper, bismuth, antimony and tellurium in the alloy phase. [0003] The domestic and foreign processes for the recovery of precious metals from precious lead mainly include: precious lead oxidation and refining—(gold-silver alloy plate) silver electrolysis—ingot casting, and then gold refining after silver electrolysis anode slime treatment. The...

Claims

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Application Information

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IPC IPC(8): C22B13/06C22B15/00C22B30/06C25C1/20C01B19/00C22B9/02C22B11/00
CPCC22B13/06C22B11/00C25C1/20C22B15/006C22B15/0065C22B30/06C22B9/02C01B19/00Y02P10/20
Inventor 李卫锋杨斌赵振波汤文通李利丽吕进赵红浩速斌秦兴宇戴卫平刘向波简爱华
Owner HENAN YUGUANG GOLD & LEAD
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