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
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Embodiment 1
[0013] Take the copper anode slime, divide it into gold by chlorination, and reduce the gold after 3.0L of the gold-immersion liquid, and pass it into SO 2 After reacting for 2 hours at a reduction temperature of 85°C, stop feeding SO 2 Immediately add 5 mol / L NaOH solution to adjust the pH to 5, continue to stir and react for 1 hour, and then filter to obtain the reduction precipitate and filtrate.
[0014] Weigh 44.60g (by dry weight) of the above-mentioned reduced precipitation residue, put it into a three-necked bottle, measure 270mL of 3 mol / L hydrochloric acid according to the liquid-solid ratio (mL:g) of 6:1, pour Stirring was started in the three-necked flask, the reaction temperature was 50° C., and the reaction time was 1 h. After filtering, washing and drying, 6.35 g of gold-platinum-palladium-enriched concentrate and 260 mL of tellurium-bismuth-enriched acid leaching solution were obtained. The pickling solution is passed into SO 2 After reacting for 2 hours at a...
Embodiment 2
[0022] Take the copper anode slime, divide it into gold by chlorination, and reduce the gold after 5.0L of the gold-immersion liquid, and pass it into SO 2 After reacting for 2 hours at a reduction temperature of 85°C, stop feeding SO 2 Immediately add 5 mol / L NaOH solution to adjust the pH to 4, continue to stir and react for 1 hour, and then filter to obtain the reduction precipitate and filtrate.
[0023] Weigh 74.50g (by dry weight) of the above-mentioned reduced precipitation residue, put it into a three-necked bottle, and measure 446mL of 3 mol / L hydrochloric acid and 1.5 The mixed acid solution prepared by mol / L sulfuric acid according to its volume ratio of 2:1 was poured into a three-neck flask to start stirring, the reaction temperature was 50°C, and the reaction time was 1h. After filtering, washing and drying, 10.55g of rich Collect the concentrate of gold, platinum and palladium and 430mL acid leaching solution enriched in tellurium and bismuth. The pickling sol...
Embodiment 3
[0031] Take the copper anode slime, divide it into gold by chlorination, and reduce the gold after 50L of the gold-immersion liquid, and pass it into SO 2 After reacting for 4 hours at a reduction temperature of 85°C, stop feeding SO 2 Immediately add 5 mol / L NaOH solution to adjust the pH to 4, continue to stir and react for 2 hours, and then filter to obtain the reduction precipitate and filtrate.
[0032] Weigh 733.9g (by dry weight) of the above-mentioned reduced precipitation residue, put it into a three-necked bottle, and measure 4465mL of 3 mol / L hydrochloric acid and 1.5 The mixed acid solution prepared by mol / L sulfuric acid according to its volume ratio of 2:1 was poured into a three-neck flask to start stirring, the reaction temperature was 50°C, and the reaction time was 1h. After filtering, washing and drying, 105g of enriched Concentrate of gold, platinum and palladium and 4320mL acid leaching solution rich in tellurium and bismuth. The pickling solution is pas...
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