Method for separating and purifying gold from noble metal solution
A precious metal and solution technology, applied in the direction of improving process efficiency, etc., can solve problems such as being easily affected by temperature, and achieve a high recovery rate
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Embodiment 1
[0023] Precious metal solution 1000 ml, Au 2.51g / L, Pd 15.33g / L, Cu 18.15g / L, Fe 6.32g / L, Pb 1.29g / L, Al 3.88g / L, hydrochloric acid concentration is 4 mol / L, put Put it into a 2000 ml three-necked flask, heat it to 80°C with an electric heating mantle, add 2.5 grams of 99.95% palladium sponge while stirring, react for 1 hour, cool, filter, and reduce the obtained sponge gold with 6 mol / L and 4 mol / L respectively The nitric acid solution was boiled and washed twice at 95°C for 30 minutes to obtain 2.506 grams of sponge gold with a purity of 99.95%. The gold content in the reduction mother liquor was less than 0.0001 g / L, and the gold recovery rate was 99.84%.
Embodiment 2
[0025] Precious metal solution 1200ml, Au 3.55g / L, Pd 9.74g / L, Pt 6.83g / L, Rh 1.45 g / L, Zn 8.22g / L, Cu 5.78g / L, Fe 2.37g / L, Pb 2.19g / L L, the concentration of hydrochloric acid is 6 mol / L, put it into a 2000ml three-necked flask, heat it to 90°C with an electric heating mantle, add 4.0 grams of 99.95% palladium sponge while stirring, and the reaction time is 1 hour, cool, filter, and reduce the sponge gold obtained respectively Boil and wash twice with 6 mol / L and 4 mol / L nitric acid solutions at a temperature of 95°C for 30 minutes to obtain a sponge gold mass of 4.254 g with a purity of 99.95%, and the gold content in the reduced mother liquor is less than 0.0001 g / L, gold recovery rate 99.86%.
Embodiment 3
[0027] Precious metal solution 1500ml, Au 3.08g / L, Pt 5.58g / L, Pd 10.27g / L, Rh 4.49g / L, Ir 1.24g / L, Ru 2.55g / L, Al 5.44g / L, Cu 2.90g / L L, Fe 7.01g / L, Sn 1.66g / L, Pb1.67g / L, the concentration of hydrochloric acid is 5 mol / L, put it into a 2000ml three-neck flask, heat it to 90℃ with the electric heating mantle, add 5.0g 99.95% Sponge palladium, the reaction time is 1.2 hours, cooling, filtering, and the sponge gold obtained by reduction is boiled and washed twice with 6 mol / L and 4 mol / L nitric acid solution respectively, at a temperature of 95°C for 30 minutes, and the quality of the sponge gold is obtained. It is 4.615 grams, the purity reaches 99.95%, the gold content in the reduction mother liquor is less than 0.0001 g / L, and the gold recovery rate is 99.89%.
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