APPLICATION OF CUPROUS SULFIDE IN RECOVERY OF AU (III) FROM AQUEOUS SOLUTIONS

Abstract

The present disclosure discloses an application of cuprous sulfide in a recovery of Au (III) from aqueous solutions, which relates to the fields of hydrometallurgy and precious metal recovery. The method of the present disclosure uses cuprous sulfide nanoparticles to recover Au (III) from aquesous solution, and undergoes gold adsorption under mechanical stirring. The method described in the present disclosure can efficiently recover Au (III) from aqueous solutions, has good recovery effects on Au (III) from acidic waste liquid, and has the advantages of energy conservation, environmental protection, and low cost.

Claims

1. The application of cuprous sulfide in a recovery of Au (III) from aqueous solutions, comprising: adding cuprous sulfide to aqueous solutions containing Au (III) to adsorb gold, wherein a pH value of the aqueous solutions containing Au (III) is 1-5; a preparation method of cuprous sulfide is as follows: mixing and reacting copper salt solution and thiosulfate solution in a concentration ratio of 1:2-1:10 of copper salt to thiosulfate, then performing centrifugation, and then drying to obtain the cuprous sulfide required, wherein the copper salt solution is a copper sulfate solution or a copper chloride solution, a concentration of the copper salt solution is 1-15 mmol/L, and a concentration of thiosulfate is 2-120 mmol/L.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The present disclosure will be further illustrated in detail in conjunction with specific embodiments, but the scope of the present disclosure is not limited to the description.

Embodiment 1

[0016] This embodiment uses a certain concentration of copper sulfate solution and sodium thiosulfate solution to prepare cuprous sulfide nanoparticles under mechanical stirring, which are used to adsorb Au (III) in aqueous solutions, including the following steps: [0017] (1) Weigh 0.025 g (1 mmol/L) of granular copper sulfate, add 80 mL of deionized water to dissolve, and set aside. [0018] (2) Weigh 0.05 g (2 mmol/L) of sodium thiosulfate, add 20 mL of deionized water to dissolve, and set aside. [0019] (3) Add the sodium thiosulfate solution in step (2) to the copper sulfate solution in step (1) (with a total volume of 100 mL), and mechanically stir at a speed of 200 rpm for 24 hours; After stirring, the solid particles obtained through centrifugal filtration are dried in a 60? C. oven for 12 hours before being taken out for later use. [0020] (4) Add the cuprous sulfide (Cu.sub.2S) dried in step (3) to a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 5 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 1, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 100%, and the loading capacity is 33.33 kg/t.

Embodiment 2

[0021] (1) Weigh 0.050 g (2 mmol/L) of granular copper sulfate, add 80 mL of deionized water to dissolve, and set aside.

[0022] (2) Weigh 0.496 g (20 mmol/L) of sodium thiosulfate, add 20 mL of deionized water to dissolve, and set aside.

[0023] (3) Add the sodium thiosulfate solution in step (2) to the copper sulfate solution in step (1) (with a total volume of 100 mL), and mechanically stir at a speed of 200 rpm for 24 hours; After stirring, the solid particles obtained through centrifugal filtration are dried in a 60? C. oven for 12 hours before being taken out for later use.

[0024] (4) Add the cuprous sulfide (Cu.sub.2S) dried in step (3) into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 10 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 2, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 100%, and the loading capacity is 50 kg/t.

Embodiment 3

[0025] (1) Weigh 0.125 g (5 mmol/L) of granular copper sulfate, add 80 mL of deionized water to dissolve, and set aside.

[0026] (2) Weigh 0.372 g (15 mmol/L) of sodium thiosulfate, add 20 mL of deionized water to dissolve, and set aside.

[0027] (3) Add the sodium thiosulfate solution in step (2) to the copper sulfate solution in step (1) (with a total volume of 100 mL), and mechanically stir at a speed of 200 rpm for 24 hours; After stirring, the solid particles obtained through centrifugal filtration are dried in a 60? C. oven for 12 hours before being taken out for later use.

[0028] (4) Weigh 0.01 g of the cuprous sulfide (Cu.sub.2S) dried in step (3), add them into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 20 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 5, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 100%, and the loading capacity is 200 kg/t.

Embodiment 4

[0029] (1) Weigh 0.136 g (8 mmol/L) of granular copper chloride, add 80 mL of deionized water to dissolve, and set aside.

[0030] (2) Weigh 0.620 g (25 mmol/L) of sodium thiosulfate, add 20 mL of deionized water to dissolve, and set aside.

[0031] (3) Add the sodium thiosulfate solution in step (2) to the copper chloride solution in step (1) (with a total volume of 100 mL), and mechanically stir at a speed of 200 rpm for 24 hours; After stirring, the solid particles obtained through centrifugal filtration are dried in a 60? C. oven for 12 hours before being taken out for later use.

[0032] (4) Weigh 0.01 g of the cuprous sulfide (Cu.sub.2S) dried in step (3), add them into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 50 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 4, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 100%, and the loading capacity is 500 kg/t.

Embodiment 5

[0033] (1) Weigh 0.250 g (10 mmol/L) of granular copper sulfate, add 80 mL of deionized water to dissolve, and set aside.

[0034] (2) Weigh 1.000 g (40 mmol/L) of sodium thiosulfate, add 20 mL of deionized water to dissolve, and set aside.

[0035] (3) Add the sodium thiosulfate solution in step (2) to the copper sulfate solution in step (1) (with a total volume of 100 mL), and mechanically stir at a speed of 200 rpm for 24 hours; After stirring, the solid particles obtained through centrifugal filtration are dried in a 60? C. oven for 12 hours before being taken out for later use.

[0036] (4) Weigh 0.01 g of the cuprous sulfide (Cu.sub.2S) dried in step (3), add them into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 100 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 3, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 100%, and the loading capacity is 1000 kg/t.

Embodiment 6

[0037] (1) Weigh 0.375 g (15 mmol/L) of granular copper sulfate, add 80 mL of deionized water to dissolve, and set aside.

[0038] (2) Weigh 2.98 g (120 mmol/L) of sodium thiosulfate, add 20 mL of deionized water to dissolve, and set aside.

[0039] (3) Add the sodium thiosulfate solution in step (2) to the copper sulfate solution in step (1) (with a total volume of 100 mL), and mechanically stir at a speed of 200 rpm for 24 hours; After stirring, the solid particles obtained through centrifugal filtration are dried in a 60? C. oven for 12 hours before being taken out for later use.

[0040] (4) Weigh 0.01 g of the cuprous sulfide (Cu.sub.2S) dried in step (3), add them into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 200 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 4, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 100%, and the loading capacity is 2000 kg/t.

Embodiment 7

[0041] Study on the adsorption performance of commercially available cuprous sulfide for Au (III)

[0042] (1) Weigh 0.01 g of commercially available cuprous sulfide (Cu 2 S) (purchased from RHAWN reagent with a purity of 99%).

[0043] (2) Add the cuprous sulfide in step (1) to a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 200 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 4, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 78%, and the loading capacity is 1560 kg/t.

Embodiment 8

[0044] (1) Add 0.170 g (10 mmol/L) of granular copper chloride to 30 mL of EDA (ethylenediamine), dissolve under magnetic stirring, and set aside.

[0045] (2) Weigh 0.23 g (0.03 mol/L) of thiourea, add it to the mixed solution in step (1), and continue stirring for 2 hours.

[0046] (3) Pour the mixed solution in step (2) into a 50 mL polytetrafluoroethylene reactor and maintain the temperature at 60? C. for 8 hours; after cooling, wash the solid particles 5-8 times with distilled water and ethanol, and dry them in a 60? C. oven for 10 hours to obtain cuprous sulfide.

[0047] (4) Weigh 0.01 g of the cuprous sulfide (Cu.sub.2S) dried in step (3), add them into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 200 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 4, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 80%, and the loading capacity is 1600 kg/t.

Embodiment 9

[0048] (1) Add 0.170 g (10 mmol/L) of granular copper chloride to 30 mL of EDA (ethylenediamine), dissolve under magnetic stirring, and set aside.

[0049] (2) Weigh 0.23 g (0.03 mol/L) of thiourea, add it to the mixed solution in step (1), and continue stirring for 2 hours.

[0050] (3) Pour the mixed solution in step (2) into a 50 mL polytetrafluoroethylene reactor and maintain the temperature at 80? C. for 8 hours; after cooling, wash the solid particles 5-8 times with distilled water and ethanol, and dry them in a 60? C. oven for 10 hours to obtain cuprous sulfide.

[0051] (4) Weigh 0.01 g of the cuprous sulfide (Cu.sub.2S) dried in step (3), add them into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 200 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 4, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 87%, and the loading capacity is 1740 kg/t.

Embodiment 10

[0052] (1) Add 0.170 g (10 mmol/L) of granular copper chloride to 30 mL of EDA (ethylenediamine), dissolve under magnetic stirring, and set aside.

[0053] (2) Weigh 0.23 g (0.03 mol/L) of thiourea, add it to the mixed solution in step (1), and continue stirring for 2 hours.

[0054] (3) Pour the mixed solution in step (2) into a 50 mL polytetrafluoroethylene reactor and maintain the temperature at 100? C. for 8 hours; after cooling, wash the solid particles 5-8 times with distilled water and ethanol, and dry them in a 60? C. oven for 10 hours to obtain cuprous sulfide.

[0055] (4) Weigh 0.01 g of the cuprous sulfide (Cu.sub.2S) dried in step (3), add them into a solution of chloroauric acid (HAuCl.sub.4) with a concentration of 200 mg/L for stirring adsorption; after adsorption for 24 hours with the pH value of 4, samples are taken and the gold concentration is analyzed by atomic absorption spectrometry. The recovery rate reached 84%, and the loading capacity is 1680 kg/t.

[0056] The specific embodiments of the present disclosure have been described in detail above, but the present disclosure is not limited to the above embodiments. Within the scope of knowledge possessed by ordinary skilled person in the art, various changes can be made without departing from the principle of the present disclosure.