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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the industry, zinc powder is generally added to replace platinum and palladium to obtain platinum palladium concentrate. However, when zinc powder is used for replacement, the reduction of platinum and palladium is not complete. The grade of platinum and palladium in the obtained platinum palladium concentrate is low, and the loss of platinum and palladium is large. Causes the loss of selenium and tellurium, and a large amount of zinc powder is easy to remain
Bismuth cannot be recovered when sulfur dioxide or sodium sulfite is used for reduction, and selenium, tellurium, gold, platinum, and palladium can be completely reduced under the action of a composite catalyst, and the reduction cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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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.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy of rare and precious metals, and specifically relates to the enrichment, separation and recovery technology of gold, platinum and palladium in the gold-precipitated liquid after copper anode slime is wet-processed, so as to realize the comprehensive recovery of resources. Background technique [0002] With the continuous development and utilization of human beings, there are fewer and fewer minerals containing rare and precious metals, and their grades are gradually depleted. At present, we are facing a severe situation of resource shortage. Copper anode slime is a high-value secondary resource containing a large amount of valuable metal elements. The efficient recycling of valuable elements is of great significance to promote the utilization of renewable resources in the non-ferrous metal industry. In the process of copper anode slime treatment, selenium distillation slag, gold precipitation soluti...

Claims

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Application Information

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IPC IPC(8): C22B7/00C01B19/02C22B30/06C22B11/00
CPCC01B19/02C22B7/007C22B11/042C22B30/06Y02P10/20
Inventor 郑雅杰张林宝
Owner CENT SOUTH UNIV
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