Recovery of natural nanoclusters and the nanoclusters isolated thereby
a nanocluster and nanocluster technology, applied in nanotechnology, nanotechnology, process efficiency improvement, etc., can solve the problems of inability to accurately determine the concentration of precious metals in these rocks, inaccessible to the action of conventional recovery agents, and inability to analyze conventional techniques
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example 1
Recovery of Copper Nanoclusters
[0095] A bright pink solution indicative of the presence of copper nanocluster colloids was produced in this example; the presence of natural nanoclusters was confirmed by TEM examination shown in FIG. 6, which is a TEM image of floc particles from a nanocluster colloid solution produced from sample BJ908-008. Pretreatment of the sample involved the preparation of an aqueous nanocluster slurry by crushing and milling as described above, then mixing with water to form a slurry. The aqueous slurry was prepared by measuring a 30.0 g portion of bulk sample BJ98-008 into a 400 ml beaker and adding 70 ml of distilled water. Prior SEM examination of this sample yielded only one nanocluster gel particle and therefore the sample was not subjected to gel hydration or peptization.
[0096] A total of 14.0 g of potassium hydroxide was added to the solution to condition the aqueous nanocluster slurry and 10.0 g of ammonium peroxydisulphate was added to stabilize the...
example 2
Gold Recovery in Copper Nanoclusters
[0098] To determine the gold content of solid copper nanocluster-bearing source material a variation of the previous experiment was carried out. The objective was to produce a pink coloured, copper nanocluster colloid solution which could then be diluted and analyzed for gold by GTA-AA. A 30.0 g crushed and milled portion of sample BJ98-008 was weighed into a 400 ml beaker and 100 ml of distilled water made up to 20% by weight potassium hydroxide was added to form the conditioned aqueous nanocluster slurry. A 10.0 g portion of ammonium peroxydisulphate was added to the aqueous slurry and the sample was placed on a stirred hotplate with a magnetic stirrer. The sample was heated to 80° C. for two hours, then removed from heat and allowed to stand for another hour. A pink coloured, colloidal solution appeared over the residue and the aqueous nanocluster solution was centrifuged for 20 minutes at 2000 rpm. The pink coloured, aqueous copper nanocluste...
example 3
Extraction of Gold, Platinum and Palladium
[0101] Further experiments were conducted under conditions of elevated dilution to ascertain the recovery of precious metals via the nanocluster colloid solution. The extraction procedure used relied solely on desorption of discrete nanoclusters. Three different samples, BJ98-008, HAR98-001 and GDP99-005, were used. Pretreatment of these solid nanocluster-bearing source materials involved crushing to −10 mesh, dry milling to particle sizes of 100% less than 100 mesh and 80% less than 250 mesh. An aqueous nanocluster slurry was prepared by measuring 0.5 g of each sample into a 150 ml beaker and adding 100 ml of distilled water and stirring with a magnetic stirrer for 1 minute. Granulated potassium hydroxide was added to the aqueous nanocluster slurry in a quantity sufficient to bring the pH of the slurry into the range pH 11.7-11.9.
[0102] The aqueous nanocluster slurry,'was processed at ambient temperature (approximately 20° C.) for a perio...
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Abstract
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