Method for comprehensively recycling valuable metals from lead anode slime by oxygen pressure treatment
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A technology of lead anode slime and valuable metals, which is applied in the direction of improving process efficiency, etc.
Active Publication Date: 2012-09-26
CHENZHOU CITY JINGUI SILVER IND CO LTD
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[0004] In order to solve or improve the deficiencies of the existing lead anode slime fire method or wet process, the present invention proposes a kind of wet method oxygen pressure treatment lead anode slime comprehensive recovery effective Valuable metal method, this method adopts advanced oxygen pressure technology and controlled potential chlorination leaching process to extract and recover valuable metals in lead anode slime step by step, and after enriching precious metals such as gold and silver, use fire method to purify. It not only makes the treatment process simple, efficient, clean and practical, but also solves the poor effect and complicated control of continuous extraction of polymetallics in the wet process, and also minimizes the pollution and harm of the process to the environment. The purpose of comprehensive recycling of resources and green metallurgy
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Embodiment 1
[0041] It will be stored for more than 15 days, dried and crushed to a particle size of 80-120 mesh lead anode slime 100Kg (composition: Pb: 13.31%, Bi: 19.77%, Cu: 1.66%, Sb: 30.27%, As: 12.31%, Ag: 6.5800%, Au: 0.0088%, Se: 0.051%, Te: 0.743%), according to the liquid-solid ratio of 7:1, the amount of NaOH added is 1.6 times the theoretical consumption, after using tap water for pulping, put in 1.0 m 3 In a high-pressure reactor, the process reaction temperature is controlled at 200°C, the oxygen pressure is 1.2MPa, and the reaction time is 3h. After the reaction, cool the slurry to 85°C, open the autoclave safely after the pressure is released, and separate the liquid and solid while it is hot. The filter residue is washed with hot water for 2 to 3 times and then sent to the controlled potential for leaching. The filtrate recovers arsenic and regenerates it. . Filter residue As: 0.28%, filtrate: As 13.26g / L, Pb 0.32g / L, process arsenic removal rate > 99.2%, Pb direct reco...
Embodiment 2
[0046] 100Kg of fresh lead anode slime will be stored for more than 15 days, dried and crushed to a particle size of 80-100 mesh, (composition: Pb: 7.89%, Bi: 11.62%, Cu: 0.55%, Sb: 38.25%, As: 11.44 %, Ag: 6.7522%, Au: 0.0062%, Se: 0.17%, Te: 0.47%), according to the liquid-solid ratio of 10:1, the amount of NaOH added is 1.8 times of the theoretical consumption. Into 1.0m 3 In the high-pressure reactor, the process reaction temperature is controlled at 180°C, the oxygen pressure is 1.6MPa, and the reaction time is 3h. After the reaction, cool the slurry to 85°C, open the autoclave safely after the pressure is released, and separate the liquid and solid while it is hot. The filter residue is washed with hot water for 2 to 3 times and then sent to the controlled potential for leaching. The filtrate recovers arsenic and regenerates it. . Filter residue As: 0.21%, filtrate: As 14.35g / L, Pb 0.25g / L, process arsenic removal rate > 99.3%, Pb direct recovery rate > 99.1%. Cool an...
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Abstract
The invention provides a method for comprehensively recycling valuable metals from lead anode slime by oxygen pressure treatment, which is characterized in that oxygen pressure alkali dip, potential-controlled chlorination leaching, fractional hydrolysis and other techniques are utilized to efficiently separate and recycle As, Sb, Bi, Cu and other valuable metals from lead anode slime, and gold, silver and lead enriched residues are transformed and subjected to fire smelting-electrolytic refining to recycle gold, silver and lead. By combining wet-process pretreatment for separating base metals with the pyrogenic process, the technique provided by the invention can efficiently remove arsenium contained in the fresh complex lead anode slime without losing lead, fundamentally solves the problem of lead and arsenium hazards and reduces the loss of valuable metals in the process; and the invention has the characteristics of strong adaptability to raw materials, high efficiency, high cleanness, low comprehensive energy consumption, high gold and silver yields, high enrichment ratio of valuable metals, high industrialization degree and the like, is simple to operate, and simultaneously implements closed-loop regenerative cycle and no pollutant waste discharge in the process. The gold yield is higher than 99.5%, the silver recycling rate is higher than 99%, the lead yield is higher than 98%, and the yield of other valuable metals is higher than 98%. The invention can independently form a system, and can also be used for improving and perfecting the pyrogenic process, thereby having high popularization value.
Description
technical field [0001] The invention belongs to the field of hydrometallurgy of nonferrous metals, and relates to a method for comprehensively recovering valuable metals from lead anode slime treated by wet oxygen pressure. Background technique [0002] The anode slime produced in the process of lead electrolysis is one of the main sources for extracting gold, silver and other precious metals. Especially in the silver production process in my country, more than 90% of the raw materials come from lead anode slime. In addition to silver, lead anode slime is also enriched with many valuable metals such as lead, arsenic, antimony, bismuth, copper, gold, etc. The traditional treatment method of lead anode slime is mainly pyrotechnics, which has the adaptability of raw materials Strong, large processing capacity, simple operation process, etc., but there are also disadvantages such as long cycle, high energy consumption, relatively large lead and arsenic hazards, particularly ...
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