Method for continuously recovering gold
A technology for recovering gold and simple gold, which is applied in the field of gold resource recovery, can solve problems such as low efficiency, and achieve the effects of low energy consumption, efficient recovery, and simple operation
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Embodiment 1
[0070] Graphene oxide was reduced to graphene by chemical reduction method, and dispersed in water by ultrasonic to obtain graphene-based dispersion.
[0071] Graphene-based film preparation method:
[0072] Get 3mL graphene-based dispersion liquid (graphene concentration is 0.5mg / mL), adopt vacuum filtration method to form graphene-based thin film on the mixed cellulose membrane, obtain composite membrane, in this composite membrane, graphene-based thin film thickness is 800nm.
[0073] Gold recovery application: use the composite membrane to filter 7L of potassium chloroaurate solution with a gold concentration of 100ppb, the effective area of the membrane is 3 square centimeters, the suction filtration pressure is 1bar, and the filtrate is collected for gold concentration test. The gold adsorption efficiency was above 50% in the first 6.4L, and then dropped to below 50%.
[0074] After the graphene-based film adsorbs and reduces gold ions to gold, the film is dried, and...
Embodiment 2
[0077] Using water as a solvent, using graphene oxide to disperse graphene, and ultrasonically preparing a graphene-based dispersion.
[0078] Graphene-based film preparation method:
[0079] Get 0.05ml graphene-based dispersion liquid (graphene concentration is 0.5mg / mL), adopt pressure-assisted filtration method to form graphene-based thin film on nylon membrane, obtain composite membrane, in this composite membrane, graphene-based thin film thickness is 10nm .
[0080] Gold recovery application: Use this composite membrane to filter 60L of gold chloride solution with a gold concentration of 1ppb, the effective area of the membrane is 3 square centimeters, the suction filtration pressure is 2bar, and the filtrate is collected for gold concentration test. The gold adsorption efficiency was above 50% in the first 50L, and then dropped to below 50%.
[0081] After the graphene-based film adsorbs and reduces gold ions to gold, the film is dried, and then calcined at a high t...
Embodiment 3
[0083] The graphene-based dispersion was prepared by adding commercial graphene nanosheets into N,N-dimethylformamide and ultrasonically.
[0084] Graphene-based film preparation method:
[0085] Take 45 mL of graphene-based dispersion (with a graphene concentration of 0.5 mg / mL), and form a graphene-based thin film on a polyethersulfone membrane by spraying to obtain a composite membrane. In the composite membrane, the graphene-based thin film has a thickness of 10,000 nm.
[0086]Gold recovery application: Use this composite membrane to filter 100L of potassium bromoaurate solution with a gold concentration of 1ppb, the effective area of the membrane is 3 square centimeters, the suction filtration pressure is 1bar, and the filtrate is collected for gold concentration test. The gold adsorption efficiency was above 50% in the first 90L, and then dropped to below 50%.
[0087] After the graphene-based film adsorbs and reduces gold ions, the film is dried, and then calcined a...
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