Method for efficiently separating arsenic from lead anode slime through low-pressure oxidation

A lead anode slime and low pressure technology is applied in the field of high-efficiency separation of arsenic by low-pressure oxidation of lead anode slime. Effect

Pending Publication Date: 2022-06-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing arsenic removal treatment technologies for lead anode slime include three typical processes: fire method, wet method and fire-wet method, but all three treatment processes have their own limitations
The pyrotechnic process has a low arsenic removal rate and is difficult to separate arsenic from intermetallic compounds, and also produces a large amount of secondary arsenic-containing fumes; Arsenic wastewater; fire-wet combined process has problems such as long process flow, complicated process, high one-time investment cost, and large amount of equipment maintenance
In addition, the process consumes a lot of chemical reagents; in the stage of electric control chlorination operation, chlorine gas often overflows, which deteriorates the operating environment

Method used

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  • Method for efficiently separating arsenic from lead anode slime through low-pressure oxidation
  • Method for efficiently separating arsenic from lead anode slime through low-pressure oxidation
  • Method for efficiently separating arsenic from lead anode slime through low-pressure oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 200g of lead anode slime and put it in a drying box and dry it at 120°C for 4 hours; take 50g of dried lead anode slime, add oxidant Pb 3 O 4 Grind together and put them into the crucible evenly, and put the crucible into the vertical resistance furnace; extract the air in the furnace until the pressure is stable at 10Pa, heat up to 698K, and keep the temperature for 3h. After the low-pressure gasification is completed, the first volatiles are collected at the condensing end and weighed for chemical analysis. The removal rate of arsenic was 96.84%.

[0027] Please refer to figure 2 and Figure 5 , grind the first volatile matter into a crucible, put it into a vertical resistance furnace, draw out the air in the furnace until the pressure is stable at 10Pa, heat up to 1173K, and keep the temperature for 4h. After the low-pressure gasification is completed, the second volatiles are collected at the condensing end and weighed for chemical analysis. The removal r...

Embodiment 2

[0050] Take 50g of dried lead anode slime, add oxidant Pb 3 O 4 Grind together and put them into the crucible evenly, and put the crucible into the vertical resistance furnace; extract the air in the furnace until the pressure is stable at 20Pa, heat up to 823K, and keep the temperature for 3h. After the low-pressure gasification is completed, the first volatiles are collected at the condensing end and weighed for chemical analysis. The removal rate of arsenic was 96.72%.

[0051] Grind the first volatile matter and put it into a crucible, put it into a vertical resistance furnace, extract the air in the furnace until the pressure is stable at 20Pa, heat up to 1173K, and keep the temperature for 4h. After the low-pressure gasification is completed, the second volatiles are collected at the condensing end and weighed for chemical analysis. The removal rate of arsenic was 98.77%, and the direct yields of gold and silver obtained in the residual area were 96.21% and 97.83%, re...

Embodiment 3

[0053] Take 50g of dried lead anode slime, add oxidant Pb 3 O 4 Grind together and put them into the crucible evenly, put the crucible into the vertical resistance furnace; extract the air in the furnace until the pressure is stable at 10Pa, heat up to 798K, and keep the temperature for 3h. After the low-pressure gasification is completed, the first volatiles are collected at the condensing end and weighed for chemical analysis. The removal rate of arsenic was 96.91%.

[0054] Grind the first volatile matter and put it into a crucible, put it into a vertical resistance furnace, draw out the air in the furnace until the pressure is stable at 10Pa, heat up to 1273K, and keep the temperature for 4h. After the low-pressure gasification is completed, the second volatiles are collected at the condensing end and weighed for chemical analysis. The removal rate of arsenic was 99.11%, and the direct yields of gold and silver obtained in the residual area were 97.77% and 98.52%, respe...

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Abstract

The invention discloses a method for efficiently separating arsenic through low-pressure oxidation of lead anode slime in the field of metal smelting. The method comprises the following steps that S1, the lead anode slime is dried and dehydrated, an oxidizing agent is added, and the lead anode slime is ground into powder after being fully mixed; s2, performing first low-pressure gasification on the mixture of the powder and the oxidizing agent, and collecting a first volatile matter at a condensation end; s3, after the first volatile matter collected at the condensation end is dried and ground, secondary low-pressure gasification is conducted on the first volatile matter again, and a second volatile matter is collected at the condensation end. According to the scheme, the difference between vapor pressure of arsenic and compounds thereof and vapor pressure of other metals is utilized, the arsenic is directionally oxidized in a low-pressure environment, so that arsenic-containing substances are fully oxidized and preferentially volatilized to achieve the purpose of arsenic removal, and compared with an existing pyrogenic arsenic removal process, the scheme avoids generation of secondary arsenic-containing waste gas and improves the removal rate of arsenic.

Description

technical field [0001] The invention belongs to the field of metal smelting, in particular to a method for efficiently separating arsenic by low-pressure oxidation of lead anode slime. Background technique [0002] Lead anode slime is an insoluble slime that adheres to the surface of the residual anode or precipitates at the bottom of the electrolytic cell during the lead electrolysis process, and is rich in precious metals such as gold, silver and tellurium. As the grade of lead ore continues to decrease and the complex arsenic-containing lead ore is put into use, the content of toxic element arsenic in lead anode slime continues to increase. Efficient arsenic removal is the premise for the subsequent extraction of gold, silver and other precious metals from lead anode slime. The existing arsenic removal treatment technologies for lead anode slime include three typical processes: fire method, wet method and fire-wet method, but all three treatment methods have their own lim...

Claims

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Application Information

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IPC IPC(8): C22B1/11C22B30/04C22B7/00C22B11/02
CPCC22B1/11C22B30/04C22B7/001C22B11/021Y02P10/20
Inventor 孔祥峰范凯杨斌戴永年伊家飞程珂珂高哲散同玉刘大春徐宝强熊恒吴鉴曲涛蒋文龙孔令鑫
Owner KUNMING UNIV OF SCI & TECH
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