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Method for removing and recovering arsenic from lead anode slime

A lead anode slime and arsenic recovery technology, applied in the direction of improving process efficiency, etc., can solve the problems of poor metal separation effect, difficult stable operation of the production process, low arsenic precipitation rate, etc., achieve low equipment material requirements, and prevent secondary pollution , The effect of stable process operation

Active Publication Date: 2011-12-07
YONGZHOU FUJIA NON FERROUS METALS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The traditional pyrotechnic process has the characteristics of strong adaptability to raw materials, simple equipment, and large processing capacity, but it also has obvious disadvantages: high energy consumption, poor metal separation effect, serious secondary pollution of arsenic, poor comprehensive recovery efficiency and serious environmental pollution
[0006] (1) Although lead anode slime is easy to oxidize, the degree of oxidation of different batches of anode slime is completely different, and the degree of oxidation is difficult to visualize, so the removal rate of arsenic in lead anode slime is low, and the production process is difficult to run stably
[0007] (2) During the hydrochloric acid leaching process of lead anode slime, arsenic and other valuable metals enter the hydrochloric acid leaching solution at the same time, making it difficult to separate valuable metals and easily causing safety accidents
[0008] (3) The traditional method of precipitating arsenic in the form of calcium arsenate or iron arsenate not only has a low rate of arsenic precipitation, but also makes it difficult to effectively utilize arsenic precipitates, which easily causes secondary pollution of arsenic

Method used

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  • Method for removing and recovering arsenic from lead anode slime

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Effect test

Embodiment 1

[0031] Take 500g of lead anode slime and wash it with hot water at 80°C for 1~2h under the condition that the liquid-solid ratio L / kg is 4:1, use a sieve with a pore size of 500um to screen out large particle inclusions, and then filter. After washing, the lead anode The slime was baked at 180°C for 36 hours, and the weight of the anode slime was 385g. Its main components were (%) by weight percentage: Pb 11.80, Bi 36.03, Cu 0.66, As 6.25, Sb 13.74 and Ag 4.11; industrial grade hydroxide Sodium, in which the content of NaOH is ≥96%; industrial grade hydrogen peroxide, in which H 2 o 2 content ≥ 30%.

[0032]Add 750ml of water into a 1500ml reactor, then add 65.0g of industrial sodium hydroxide of the above-mentioned ingredients, install the potential measuring device, adjust the stirring speed to 400r / min, heat the solution until the reaction temperature is 80°C, add the lead of the above-mentioned ingredients The anode slime powder is 150g, and the potential displayed by th...

Embodiment 2

[0035] Take 600g of lead anode slime and wash it with hot water at 80°C for 1~2h under the condition that the liquid-solid ratio L / kg is 4:1, use a sieve with a pore size of 500um to screen out large particle inclusions, and then filter. After washing, the lead anode The slime was baked at 180°C for 36 hours, the weight of the anode slime was 490g, and its main components were (%) by weight percentage: Pb 11.15, Bi 32.17, Cu 1.59, As 7.52, Sb 25.73 and Ag 7.42; industrial grade hydrogen oxide Sodium, in which the content of NaOH is ≥96%; industrial grade hydrogen peroxide, in which H 2 o 2 content ≥ 30%.

[0036] Add 750ml of water into a 1500ml reactor, then add 70.0g of industrial sodium hydroxide of the above ingredients, install the potential measuring device, adjust the stirring speed to 450r / min, heat the solution until the reaction temperature is 80°C, add the lead of the above ingredients The anode slime powder is 150g, and the potential displayed by the potentiomete...

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Abstract

The invention discloses a method for removing and recovering arsenic from lead anode slime, which comprises the following steps of: performing screening, hot water washing and baking on the lead anode slime, performing oxidation leaching by controlling potential in sodium hydroxide solution, oxidizing the arsenic by using compressed air and hydrogen peroxide as oxidants respectively, adding the oxidized arsenic into alkaline leachate, and ensuring metals such as bismuth, lead, stibium and copper are oxidized and then enter alkaline leaching residue together with noble metals; and after alkaline oxidization leaching process is finished, filtering while hot, performing cooling crystallization on the leachate to generate sodium arsenate crystals, supplementing certain sodium hydroxide to crystallization mother liquor, returning the crystallization mother liquor to the leaching process, and separating and recovering the arsenic and other valuable metals from the lead anode slime. The arsenic leaching rate is over 98.0 percent and the secondary arsenic pollution is free; and the method has the advantages of low requirement on equipment materials, safe operation, low labor intensity, short treatment time and good operating environment.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of metallurgy, in particular to a hydrometallurgical method for effectively removing and recovering arsenic from lead anode slime. Background technique [0002] Lead anode slime is composed of various components that are insoluble in the electrolyte during the electrolytic refining process of crude lead. Its composition and yield mainly depend on factors such as anode composition, casting quality and electrolysis technical conditions. The yield of lead electrolytic anode slime fluctuates 0.9~1.8%, moisture content about 35~40%, anode slime mainly contains arsenic, lead, antimony, bismuth, copper, gold, silver and scattered metals, etc. Therefore, lead anode slime is used to extract antimony, bismuth and rare precious metals, etc. important raw materials. Due to the depletion of mineral resources, high-arsenic lead ores are widely used in the smelting process of lead, which makes the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/00C22B3/12C22B30/04
CPCY02P10/20
Inventor 杨天足王安刘伟锋蔡练兵文剑锋张杜超窦爱春李家元杨际幸
Owner YONGZHOU FUJIA NON FERROUS METALS
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