Method for recovering gold, silver, bismuth, stibium and copper from lead anode mud
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A technology for lead anode slime and gold recovery, applied in the field of bismuth, recovery of gold, antimony and copper, metal recovery, silver, to achieve the effect of low pollution, low energy consumption and continuous process
Inactive Publication Date: 2010-09-15
HULUDAO ZINC IND CO LTD
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[0028] Take 1500kg of pretreated lead anode slime, which has a water content of 10%, main components: Au 0.008%, Ag 10.7%, Sb 33.06%, Bi 22.03%, Cu 9.88%, at an initial hydrochloric acid concentration of 4mol / L, the solid-liquid ratio 1:4, at room temperature, stirring and leaching for 4h. Add 45 kg of sodium sulfide to the resulting leachate at room temperature, stir for 20 minutes, add water to dilute the volume to 8 times, adjust the pH value of the solution to 1.0, and hydrolyze and precipitate antimony until the precipitation of antimony oxychloride is complete, and the solid and liquid are separated. Add industrial sodium carbonate to the antimony-precipitated solution at room temperature under stirring conditions, adjust the pH value of the solution to 3.0 to neutralize the deposited bismuth, until the bismuth oxychloride is completely precipitated, and the solid and liquid are separated. The temperature of the bismuth-precipitated liquid is 80°C, under the condition of...
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Abstract
The invention relates to a method for recovering gold, silver, bismuth, stibium and copper from lead anode mud. The method is carried out through the following working procedures of: (1) leaching by using hydrochloric acid; (2) smelting leached residues; (3) electrolyzing silver; (4) chloridizing to extract gold; (5) precipitating the silver by using sodium sulfide; (6) hydrolyzing to precipitate the stibium; (7) neutralizing to precipitate the bismuth; and (8) displacing copper by using iron. In the invention, through the steps of pre-oxidizing before wet-process leaching of the lead anode mud, leaching by using hydrochloric acid at normal temperature, precipitating the silver by using the sodium sulfide, hydrolyzing to precipitate the stibium, neutralizing to precipitate the bismuth, displacing to precipitate the copper, smelting the leached residues, electrolyzing the silver and chloridizing to extract the gold, the purpose of comprehensively extracting the valuable metals of the gold, the silver, the bismuth, the stibium and the copper from the lead anode mud is achieved. The method has continuous process, low energy consumption, low pollution, easy operation and high extraction rate and is suitable for extracting the valuable metals from the lead anode mud in the field of metal smelting.
Description
technical field [0001] The invention relates to a metal recovery method in the field of metallurgical industry, in particular to a method for recovery of gold, silver, bismuth, antimony and copper from lead anode slime. Background technique [0002] Lead anode slime is the main raw material for silver production, and the silver produced therefrom accounts for more than 90% of the national silver output. In addition to silver, lead anode slime also contains valuable metals such as antimony, bismuth, copper, lead, arsenic, and gold. Variation range of main components of lead anode slime: Au 0.002-0.8%, Ag0.1-25%, Sb 1-43%, Bi 1-25%, Cu 0.5-10%, Pb 1-20%. The traditional treatment method of lead anode slime is pyrotechnics, which has the characteristics of large processing capacity and strong adaptability of raw materials, but also has long production cycle, high energy consumption, serious environmental pollution, and valuable bismuth, antimony, copper, etc. Metals cannot be...
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