Method for gathering and recycling gold, platinum, palladium, selenium, tellurium and bismuto through reduction, hydrolysis and coprecipitation
A technology for recovering gold and co-precipitation, applied in the direction of element selenium/tellurium, improvement of process efficiency, etc., can solve the problems of low grade of platinum and palladium in platinum and palladium concentrate, incomplete reduction of platinum and palladium, and inability to realize bismuth recovery, etc. High leaching rate, easy separation and recovery, and the effect of improving equipment utilization
Inactive Publication Date: 2017-08-11
CENT SOUTH UNIV
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Abstract
The invention discloses a method for gathering and recycling gold, platinum, palladium, selenium, tellurium and bismuto through reduction, hydrolysis and coprecipitation. Firstly, SO2 is introduced into a solution, after a reduction reaction is completed, sodium hydroxide is added for hydrolytic precipitation, reduction precipitation sludge is obtained through filtration, the reduction precipitation sludge is subjected to acid leaching, pickle liquor rich in tellurium and bismuth and concentrate rich in gold, platinum and palladium are obtained through filtration, the concentration of tellurium and the concentration of bismuth in the pickle liquor are compared with the concentration of tellurium and the concentration of bismuth in a solution precipitated gold, the tellurium is gathered by 6.7 times, and the bismuth is gathered by 11.2 times; and the contents of gold, platinum and palladium in the gold, platinum and palladium concentrate reach to 3.34%, 0.42% and 1.4%, and compared with the content of gold, the content of platinum and the content of palladium in the reduction precipitation sludge, the gold is gathered by 10 times, the platinum is gather by 10 times, and the palladium is gathered by 10 times. After the pickle liquor rich in tellurium and bismuth is reduced by SO2, tellurium powder and a tellurium reduced solution are obtained, the sodium hydroxide is added into the tellurium reduced solution for hydrolysis, and bismoclite is obtained through filtration. The reduction precipitation efficiency of all kinds of metal is high, the recovery rate of valuable metal is high, the equipment utilization rate is increased, and the equipment investment is reduced.
Application Domain
Process efficiency improvementElemental selenium/tellurium
Technology Topic
Environmental chemistryCoprecipitation +10
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- Experimental program(3)
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