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
5 Cites 5 Cited by

AI-Extracted 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 pa...
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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

Examples

  • Experimental program(3)

Example Embodiment

[0012] Example 1
[0013] Take the copper anode slime, separate the gold by chlorination, and reduce the gold to obtain 3.0L of the gold immersion liquid, then pass in SO 2 After reacting for 2h at a reduction temperature of 85℃, stop the introduction of SO 2 And immediately add 5mol/L NaOH solution to adjust the pH to 5, continue to stir and react for 1h, and then filter to obtain reduced precipitation residue and filtrate.
[0014] Weigh 44.60g (by dry weight) of the above-mentioned reduced precipitation residue, put it into a three-necked flask, measure 270mL of 3 mol/L hydrochloric acid according to the liquid-solid ratio (mL:g) of 6:1, and pour The stirring was started in a three-necked flask, the reaction temperature was 50° C., the reaction time was 1 h, and after filtering, washing and drying, 6.35 g of gold-platinum-palladium-enriched concentrate and 260 mL of acid leaching solution enriched in bismuth tellurium were obtained. The acid leaching solution is passed into SO 2 Reacted for 2h at a reduction temperature of 85℃, filtered, washed and dried to obtain 5.92g of tellurium powder and 261mL of reduced tellurium solution. NaOH solution was added to the reduced tellurium solution to adjust pH=2, the reaction time was 2h, and the reaction temperature Precipitate bismuth at 50°C, filter, wash and dry to obtain 14.63g bismuth oxychloride and 255 mL of precipitated bismuth solution. The composition of the gold immersion solution, filtrate, acid leaching solution, tellurium reduction solution, and bismuth precipitation solution are shown in Table 1-1. The reduction precipitation rate and acid leaching rate of each element are shown in Table 1-2, reduction precipitation The composition of the slag and concentrate enriched with gold, platinum and palladium is shown in Table 1-3.
[0015] Table 1-1 Composition of gold immersion liquid, filtrate, acid leaching solution, tellurium reduction solution, and bismuth precipitation solution /mgL -1
[0016] element Au Pt Pd Se Te Bi Immersion gold liquid 70.25 2.54 12.72 306 3533 4067 filtrate 0.7 0 0.26 65.2 45.3 5.44 Acid leaching 0 0 0 96.33 22351 45113 After tellurium reduction 0 0 0 0.03 103 44859 After precipitation of bismuth liquid 0 0 0 0 2.3 2.54
[0017] Table 1-2 Reduction precipitation rate and acid leaching rate of each element /%
[0018] element Au Pt Pd Se Te Bi Reduction precipitation rate 98.77 100 97.48 73.72 98.41 99.84 Acid leaching rate 0 0 0 3.84 61.34 99.87
[0019] Table 1-3 Composition of reduced precipitation slag and gold, platinum and palladium concentrate /%
[0020] element Au Pt Pd Se Te Bi other Reduced precipitation 0.37 0.03 0.09 1.41 23.40 26.6 48.1 Gold platinum palladium concentrate 3.31 0.47 1.42 10.24 70.08 0 14.48

Example Embodiment

[0021] Example 2
[0022] Take the copper anode slime, separate the gold by chlorination, and reduce the gold to obtain 5.0L of the gold immersion liquid, then pass in SO 2 After reacting for 2h at a reduction temperature of 85℃, stop the introduction of SO 2 And immediately add 5mol/L NaOH solution to adjust the pH to 4, continue to stir and react for 1h, then filter to obtain reduced precipitation residue and filtrate.
[0023] Weigh 74.50g of the above-mentioned reduced precipitation residue (by dry weight), put it into a three-necked flask, and measure 446 mL of 3 mol/L hydrochloric acid and 1.5 at a liquid-solid ratio (mL:g) of 6:1. The mixed acid solution prepared by mol/L sulfuric acid at a volume ratio of 2:1 was poured into a three-necked flask to start stirring. The reaction temperature was 50°C, and the reaction time was 1h. After filtration, washing and drying, 10.55g of rich Collect gold, platinum, palladium concentrate and 430 mL of acid leaching solution enriched with bismuth tellurium. The acid leaching solution is passed into SO 2 After reacting for 3h at the reduction temperature of 85℃, it was filtered. After washing and drying, 9.84g of tellurium powder and 426mL of reduced tellurium were obtained. NaOH solution was added to the reduced tellurium to adjust pH=2. The reaction time was 2h, and the reaction temperature Precipitation of bismuth was performed at 50°C, filtered, washed and dried to obtain 24.11 g of bismuth oxychloride and 415 mL of precipitated bismuth solution. The composition of the gold immersion solution, filtrate, acid leaching solution, tellurium reduction solution, and bismuth precipitation solution are shown in Table 2-1. The reduction precipitation rate and acid leaching rate of each element are shown in Table 2-2. The composition of the concentrate of slag and enriched gold, platinum and palladium is shown in Table 2-3.
[0024] Table 2-1 Composition of gold immersion liquid, filtrate, acid leaching solution, tellurium reduction solution, and bismuth precipitation solution /mgL -1
[0025] element Au Pt Pd Se Te Bi Immersion gold liquid 70.25 2.54 12.72 306 3533 4067 filtrate 0.51 0.01 0.02 49.10 30.06 21.41 Acid leaching 0 0 0 152 22680 44739 After tellurium reduction 0 0 0 0.5 53 44703 After precipitation of bismuth liquid 0 0 0 0 0.13 3.18
[0026] Table 2-2 Reduction precipitation rate and acid leaching rate of each element /%
[0027] element Au Pt Pd Se Te Bi Reduction precipitation rate 99.12 99.5 99.83 80.2 98.95 99.35 Acid leaching rate 0 0 0 5.63 58.39 99.65
[0028] Table 2-3 Reduced precipitation slag, gold platinum palladium concentrate composition /%
[0029] element Au Pt Pd Se Te Bi other Reduced precipitation 0.37 0.03 0.09 1.41 25.40 26.4 46.30 Gold platinum palladium concentrate 3.34 0.42 1.42 10.03 69.58 0 15.21

Example Embodiment

[0030] Example 3
[0031] Take the copper anode slime, separate the gold by chlorination, and reduce the gold to obtain 50L of the gold immersion liquid, then pass in SO 2 After reacting for 4h at a reduction temperature of 85℃, stop the introduction of SO 2 And immediately add 5mol/L NaOH solution to adjust the pH to 4, continue to stir and react for 2h, then filter to obtain reduced precipitation residue and filtrate.
[0032] Weigh 733.9g of the above-mentioned reduced precipitation residue (by dry weight), put it into a three-necked flask, measure 4465mL of 3 mol/L hydrochloric acid and 1.5 according to the liquid-solid ratio (mL:g) of 6:1 A mixed acid solution prepared with mol/L sulfuric acid in a volume ratio of 2:1, pour it into a three-necked flask and start stirring. The reaction temperature is 50°C, the reaction time is 1h, and 105g of enrichment is obtained after filtration, washing and drying. Gold, platinum, palladium concentrate and 4320mL of acid leaching solution enriched with bismuth tellurium. The acid leaching solution is passed into SO 2 After reacting for 4h at a reduction temperature of 85℃, it was filtered, washed and dried to obtain 98.5g of tellurium powder and 4250mL of reduced tellurium solution. NaOH solution was added to the reduced tellurium solution to adjust pH=2, the reaction time was 2h, and the reaction temperature Precipitation of bismuth was performed at 50°C, filtered, washed and dried to obtain 245.2g of bismuth oxychloride and 4135mL of precipitated bismuth solution. The composition of the gold immersion solution, filtrate, acid leaching solution, tellurium reduction solution, and bismuth precipitation solution are shown in Table 3-1. The reduction precipitation rate and acid leaching rate of each element are shown in Table 3-2. The composition of slag and concentrate enriched with gold, platinum and palladium are shown in Table 3-3.
[0033] Table 3-1 Composition of gold immersion liquid, filtrate, acid leaching solution, tellurium reduction solution, and bismuth precipitation solution /mgL -1
[0034] element Au Pt Pd Se Te Bi Immersion gold liquid 70.25 2.54 12.72 306 3533 4067 filtrate 0.05 0.01 0.01 48.38 12.03 10.55 Acid leaching 0 0 0 154 23630 44982 After tellurium reduction 0 0 0 1.5 83 44229 After precipitation of bismuth liquid 0 0 0 0 0.03 2.68
[0035] Table 3-2 Reduction precipitation rate and acid leaching rate of each element /%
[0036] element Au Pt Pd Se Te Bi Reduction precipitation rate 99.92 99.65 99.83 80.5 99.58 99.68 Acid leaching rate 0 0 0 5.63 60.45 99.86
[0037] Table 3-3 Composition of reduced precipitation slag and gold, platinum and palladium concentrate /%
[0038] element Au Pt Pd Se Te Bi other Reduced precipitation 0.37 0.03 0.09 1.21 25.40 26.7 45.20 Gold platinum palladium concentrate 3.34 0.42 1.42 10.24 68.38 0 15.12

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