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Method for removing arsenic from lead anode mud

A lead anode slime and removal technology, which is applied in chemical instruments and methods, arsenic compounds, and process efficiency improvement, can solve the problems of low production cost, large arsenic-containing wastewater, etc. Harmful effect

Active Publication Date: 2019-05-21
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a good arsenic removal effect, the highest can reach about 90%, and the production cost is low, but it will produce a large amount of arsenic-containing wastewater

Method used

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  • Method for removing arsenic from lead anode mud
  • Method for removing arsenic from lead anode mud
  • Method for removing arsenic from lead anode mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 200g of lead anode slime and put it into an electric blast drying oven, dry it at 105°C for 5 hours, and the weight loss is 25.05%; take 30g of dried lead anode slime and grind it evenly, put it into a crucible, and put it into a tubular resistance furnace; vacuumize , when the pressure in the furnace is stabilized at 5Pa, control the resistance furnace to heat up to 600°C at a heating rate of 17°C / min, and keep it warm for 3 hours. During the heat preservation process, the pressure in the reactor fluctuates within the range of 1-500Pa; product and condensate, the obtained residue contains 3.83% arsenic, the arsenic removal rate is 98.04%, and the condensate is diarsenic trioxide (such as figure 2 shown), the direct recovery rate of silver and copper is >99%, the direct recovery rate of antimony is 55.66%, and the direct recovery rate of lead is 98.22%.

Embodiment 2

[0018] Take 500g of lead anode slime and put it into an electric blast drying oven, dry it at 120°C for 20 hours, and the weight loss is 28.18%; take 30g of dried lead anode slime and grind it evenly, put it into a crucible, and put it into a tubular resistance furnace; vacuumize , when the pressure in the furnace is stabilized at 10000Pa, control the resistance furnace to raise the temperature to 800℃ at 22℃ / min, and keep it warm for 2h. , the obtained residue contains 8.16% arsenic, and the arsenic removal rate is 91.81%. 91.21%.

Embodiment 3

[0020] Put 500g of lead anode slime into an electric blast drying oven, dry at 150°C for 10h, and lose 27.43% of its weight; take 30g of dried lead anode slime and grind it evenly, put it into a crucible, place a wood carbon layer on the upper 8cm of the crucible, and put Put it into a tubular resistance furnace; pump vacuum, and when the pressure in the furnace is stable at 100Pa, control the temperature of the resistance furnace to rise to 700°C at 18°C / min and keep it warm for 4 hours. During the heat preservation process, the pressure in the reactor fluctuates within the range of 1~500Pa; After the reaction, the residue and condensate were collected, and the residue contained 8.52% arsenic, and the arsenic removal rate was 92.80%. The condensate was mainly elemental arsenic (such as image 3 shown), the direct recovery rate of copper and silver is >99%, the direct recovery rate of antimony is 57.86%, and the direct recovery rate of lead is 93.35%.

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Abstract

The invention discloses a method for removing arsenic from lead anode mud and belongs to the technical field of thermometallurgy. According to the method, at first, the lead anode mud is dried and dehydrated, the lead anode mud is roasted and treated on the vacuum condition, arsenic oxide and simple substance arsenic in the lead anode mud are volatilized at a high temperature, and the purpose of arsenic removing is achieved; and by adding a carbon layer on the upper portion of a lead anode mud raw material, volatile toxic arsenic oxide is reduced into low-toxicity single-substance arsenic. According to the method, the flow is simple, the arsenic removing effect is remarkable, only by means of vacuum volatility, arsenic in the lead anode mud can be removed by over 90%, the direct recovery rate of other valuable metal Ag and Cu is 99%, and the direct recovery rate of Pb is 95%. The method is low in investment cost and high in economic benefit, and has a very good industrialized prospect.

Description

technical field [0001] The invention discloses a method for removing arsenic from lead anode slime, which belongs to the field of pyrometallurgy. Background technique [0002] Lead anode slime mainly comes from the slime attached to the surface of the anode substrate or deposited on the bottom of the electrolytic tank or suspended in the electrolyte during the electrolytic refining of crude lead. Due to the complex composition of lead anode slime, it usually contains a large amount of antimony, lead, bismuth, arsenic, silver and a small amount of gold, copper and other elements, and exists in various phases. Arsenic compounds are highly toxic, and the arsenic content in lead anode slime is as high as 40%, so a large amount of lead anode slime cannot be recycled. The content of precious metals in lead anode slime is generally much higher than that of mined precious metal ores, and it is an important raw material for extracting precious metals Au, Ag and other valuable metals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/04C01G28/00
CPCY02P10/20
Inventor 徐宝强史腾腾杨斌蒋文龙杨佳刘大春李一夫戴永年李家辉赵晋阳郁青春田阳王飞曲涛熊恒孔令鑫
Owner KUNMING UNIV OF SCI & TECH
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