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Bullion lead treatment method

A treatment method and precious lead technology, applied in the field of metallurgy, can solve problems such as harsh working environment, high labor cost per ton of silver, and low production efficiency

Active Publication Date: 2019-08-27
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned method has the following disadvantages: ① high production cost; ② large amount of dust generation and high content of arsenic and antimony, harsh working environment, and high pressure on environmental protection; ③ long process flow, low production efficiency, and long backlog of precious metals in the process; ④Due to physical entrainment in the oxidation decopper slag, a large amount of gold and silver is carried out, resulting in a low direct recovery rate of precious metals; ⑤The labor intensity is high, and the labor cost per ton of silver is high; High arsenic content in lead

Method used

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  • Bullion lead treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] according to figure 1 The schematic diagram of the flow chart shows the comprehensive treatment of precious lead:

[0081] (1) 1000kg of precious lead material (Ag 11.8%, Cu 9.81%, Sb17.18%, As 16.14%, Pb 34.3%, Bi9.61%, Au 10.7g / t) is placed in a stationary vacuum distillation furnace, At a temperature of 850°C and a vacuum of 10Pa, vacuum distillation was carried out for 6 hours, and elemental arsenic (Ag 0.03%, Cu 0.02%, As97%, Pb+Bi+Sb 2%) 155kg, the primary condensing pan (500-300°C) to obtain 520kg of lead-bismuth-antimony alloy (Ag 2000g / t, Cu0.04%, Sb 3%, Pb+Bi95%, As 1%), and the bottom of the crucible to obtain residual Material (As 0.8%, Ag 36%, Cu30%, Sb31%, Pb+Bi 0.1%) 320kg;

[0082] (2) The lead-bismuth-antimony alloy that described step (1) obtains is carried out converter oxidation refining, obtains antimony white powder 18.7kg and lead-bismuth alloy (Pb 76%, Bi 23.2%) 494kg; Wherein the warm temperature of converter oxidation refining is 950 ℃, the ...

Embodiment 2

[0095] according to figure 1 The schematic diagram of the flow chart shows the comprehensive treatment of precious lead:

[0096] (1) 1000kg of precious lead material (Ag 11.8%, Cu 9.81%, Sb17.18%, As 16.14%, Pb 34.3%, Bi9.61%, Au 10.7g / t) is placed in a stationary vacuum distillation furnace, At a temperature of 950°C and a vacuum of 20Pa, vacuum distillation was carried out for 5 hours, and elemental arsenic (Ag 0.02%, Cu 0.03%, As97.6%, Pb+Bi +Sb1.8%) 154.6kg, the primary condensation pan (500~300℃) to obtain lead-bismuth-antimony alloy (Ag 2000g / t, Cu 0.03%, Sb 2.7%, Pb+Bi 95.8%, As 0.76%) 518.9kg , the bottom of the crucible obtained residue (As 0.78%, Ag 36.2%, Cu 30.1%, Sb 30.6%, Pb+Bi 0.1%) 318.9kg;

[0097] (2) The lead-bismuth-antimony alloy that described step (1) obtains is carried out converter oxidation refining, obtains antimony white powder 18.8kg and lead-bismuth alloy (Pb 75.8%, Bi 24%) 493kg; Wherein the warm temperature of converter oxidation refining is ...

Embodiment 3

[0110] according to figure 1 The schematic diagram of the flow chart shows the comprehensive treatment of precious lead:

[0111] (1) 1000kg of precious lead material (Ag 11.8%, Cu 9.81%, Sb17.18%, As 16.14%, Pb 34.3%, Bi9.61%, Au 10.7g / t) is placed in a stationary vacuum distillation furnace, At a temperature of 1000°C and a vacuum of 30Pa, vacuum distillation was carried out for 6 hours, and elemental arsenic (Ag 0.021%, Cu0.02%, As 96%, Pb+Bi +Sb 2.2%) 154.5kg, a lead-bismuth-antimony alloy (Ag2200g / t, Cu 0.03%, Sb 3.2%, Pb+Bi 95.1%, As 1%) 521kg, crucible bottom The residue (As0.78%, Ag 36.5%, Cu 29.8%, Sb 30.7%, Pb+Bi 0.1%) 320.2kg was obtained;

[0112] (2) the lead-bismuth-antimony alloy that described step (1) obtains is carried out converter oxidation refining, obtains antimony white powder 17.9kg and lead-bismuth alloy (Pb 76.1%, Bi 22.9%) 494.5kg; Wherein the temperature temperature of converter oxidation refining is 1000°C for 15 minutes, top blowing oxygen to p...

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Abstract

The invention provides a bullion lead treatment method. The bullion lead treatment method comprises the steps of obtaining elemental arsenic, a lead-bismuth-stibonium alloy and residues through primary vacuum distillation; conducting converter oxidation treatment, electrolysis, reduction smelting, continuous vacuum distillation and chlorination refining on the lead-bismuth-stibonium alloy to obtain white powdery antimony, electric lead, silver, high-purity bismuth and lead chloride; conducting secondary vacuum distillation on the residues to obtain a silver alloy and a copper alloy; conductingconverter oxidizing refining, electrolysis and oxygen pressure acid leaching decoppering on the silver alloy and the copper alloy to obtain white powdery antimony, electric silver and copper sulfate.According to the bullion lead treatment method, four kinds of target materials can be obtained through twice vacuum distillation; the treatment flow is short; high-efficiency recovery on lead, copper, silver, gold, stibonium, bismuth and arsenic can be realized; and the production environment is good, the manual labor intensity is low, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a treatment method for noble lead. Background technique [0002] my country is a major producer of refined lead, with a total output of 4.716 million tons in 2017, a record high since 2012. Crude lead is usually produced by fire refining and then electrolytic refining to produce refined lead. The process of electrolytic refining of crude lead produces lead anode slime (the output of anode slime is 1-2% of the mass of crude lead). Most of the metals in lead anode slime exist in the form of oxides, which is not conducive to the direct extraction of metals. Therefore, before extracting precious metals, the anode slime needs to be reduced and smelted to reduce the metal oxides to metals, and the alloy produced in this process is noble lead. In addition to lead, the main chemical composition of noble lead also contains a large number of rare and precious metals that exist in the ...

Claims

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Application Information

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IPC IPC(8): C22B1/11C22B7/00C22B13/02C25C1/18C22B5/02C22B30/06C22B11/02C25C1/20C22B15/14C22B30/04C01G21/16C01G3/10C01G30/00
CPCC22B1/11C22B7/001C22B13/025C25C1/18C22B5/02C22B30/06C22B11/021C25C1/20C22B15/006C22B15/0071C22B7/007C22B30/04C01G21/16C01G3/10C01G30/00Y02P10/20
Inventor 杨斌刘大春蒋文龙黄大鑫徐宝强戴卫平李一夫郁青春陈秀敏杨红卫田阳邓勇王飞熊恒杨佳曲涛孔令鑫
Owner KUNMING UNIV OF SCI & TECH