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Method for dearsenicating fresh high-arsenium lead anode slime under oxygen pressure

A lead anode slime and anode slime technology, applied in the direction of improving process efficiency, to achieve the effect of strong selectivity, less impurities and good quality

Inactive Publication Date: 2012-08-15
HULUDAO ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lead anode slime is pretreated by hot-dipping, filtering, roasting and ball milling. After the pretreatment, the lead anode slime is subjected to high temperature and high pressure alkaline leaching and oxygen pressure leaching. ,

Method used

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  • Method for dearsenicating fresh high-arsenium lead anode slime under oxygen pressure
  • Method for dearsenicating fresh high-arsenium lead anode slime under oxygen pressure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 300g of fresh high-arsenic lead anode slime and wash it with hot water at 90°C according to the solid-to-liquid ratio of 1:3 for 0.5-1.0h, and put the washed lead anode slime in an oven at 220°C for 1.0h. After the sample is cooled, the sample is prepared by ball milling, and the particle size of the ball mill is 100-120 mesh. The composition of the lead anode slime sample is Pb: 7.89; Bi: 6.62; Cu: 0.55; Sb: 38.25; As: 11.44; Ag: 6.7522; Au: 0.0062;

[0030]Take 200g of the pretreated lead anode slime sample, add tap water to make slurry according to the solid-to-liquid ratio of 1:6, and add NaOH which is 1.8 times the theoretical consumption of arsenic-antimony reaction, stir well and put it into a 2L high-pressure reactor. After confirming that the high-pressure reactor equipment is operating normally, adjust the stirring speed to 700r / min, control the reaction temperature to 180°C, the reaction oxygen pressure to 1.0MPa, and the reaction time to 2h according to...

Embodiment 2

[0034] Take 100Kg of fresh high-arsenic lead anode slime with hot water at 90°C for sizing and washing for 1.5 hours at a solid-to-liquid ratio of 1:2, and put the washed lead anode slime in an oven at 200°C for 1.5 hours. After cooling, the samples were prepared by ball milling, and the particle size of the ball mill was 100-120 mesh. The composition of the lead anode slime sample by mass percentage is: Pb: 14.33; Bi: 10.38; Cu: 0.38; Sb: 37.45; As: 12.62; Ag: 6.6559;

[0035] Take 70Kg of the pretreated lead anode slime sample, add tap water to slurry according to the solid-to-liquid ratio of 10:1, and add NaOH that is 1.6 times the theoretical consumption of arsenic-antimony reaction, and place it in 1.0m after fully stirring 3 In the high-pressure reactor, after confirming that the high-pressure reactor equipment is operating normally, adjust the stirring speed to 500r / min, control the reaction temperature to 200°C, the reaction oxygen pressure to 1.2MPa, and the reaction ...

Embodiment 3

[0039] Take 150Kg of fresh high-arsenic lead anode slime with hot water at 90°C for sizing and washing for 1.0h at a solid-to-liquid ratio of 1:4, and put the washed lead anode slime in an oven at 180°C for 1.0h. After cooling, the samples were prepared by ball milling, and the particle size of the ball mill was 100-120 mesh. The composition of the lead anode slime sample by mass percentage is: Pb: 13.2; Bi: 18.99; Cu: 0.41; Sb: 30.51; As: 12.06; Ag: 6.6676;

[0040] Take 100Kg of the pretreated lead anode slime sample, add tap water to make slurry according to the solid-to-liquid ratio of 1:7, and add NaOH which is 2.0 times the theoretical consumption of arsenic-antimony reaction, and put it into 1.0m 3 In the high-pressure reactor, after confirming that the high-pressure reactor equipment is operating normally, adjust the stirring speed to 500r / min, control the reaction temperature to 190°C, the reaction oxygen pressure to 0.8MPa, and the reaction time to 4h according to th...

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Abstract

The invention provides a method dearsenicating fresh high-arsenium lead anode slime under oxygen pressure, which comprises the following steps: pretreating lead anode slime, adding alkali, introducing oxygen, carrying out alkali dip under oxygen pressure, and carrying out hot filtration to form a filtrate and dearsenicated anode slime; after separating metals from the dearsenicated anode slime, smelting to acquire silver; and cooling to crystallize the filtrate, and separating sodium arsenate crystals and crystallization mother liquor, wherein the crystallization mother liquor is subjected toarsenium fixation to form arsenium fixed residues which are stored, and the filtration after arsenium fixation is subjected to environment-friendly emission. The method provided by the invention has the characteristics of strong selectivity in the reaction process, favorable dearsenication effect, high recovery rate of noble metals (gold and silver), low oxygen consumption and low energy consumption, and is simple to operate. The invention is suitable for dearsenicating lead anode slime in the hydrometallurgical process.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of non-ferrous metals, and relates to a wet pretreatment process in the metallurgy process of precious metals, in particular to a method for removing arsenic under oxygen pressure from fresh high-arsenic lead anode slime. Background technique [0002] In the metallurgical process of precious metals, in addition to ore sources, most of its raw materials come from the by-products produced in the metallurgical process of heavy metals, especially the anode slime in the smelting process of copper and lead has become the main source of gold and silver recovery. With the rapid development of the non-ferrous metallurgy industry, the shortage of ore resources has become increasingly severe. Resources rich in various impurities have become a hot spot for competition, especially in the lead metallurgy industry. Lead concentrates with high arsenic and many impurities have been gradually used in The producti...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B3/12A62D3/00
CPCY02P10/20
Inventor 杨尚锋王铁成刘贵德赵丹
Owner HULUDAO ZINC IND CO LTD
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