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INVENTION
Patent of the Russian Federation RU2138567
METHOD OF REMOVING GOLD FROM GOLDEN DETAILS CONTAINING MOLYBDENES
The name of the inventor: Loleit SI; Kalmykov Yu.M .; Davydov V.Ya.; Agafonov O.V.
The name of the patent holder: Shchelkovo Plant of Secondary Precious Metals
Address for correspondence: 141511, Moscow region, Solnechnogorsk district, Kryukovo, AOOT "NPO Stekloplastik"
Date of commencement of the patent: 1998.05.25
The method of extracting gold , in particular from gold-plated parts containing molybdenum, refers to metallurgy and can be used in the extraction of precious metals from waste gold-plated parts, which are based on molybdenum, including processing of feedstock and gold deposition, with gold- containing material as the starting material Raw materials on a molybdenum basis, the treatment of which is carried out with a solution of tsar's vodka, followed by carbamide, after which the resulting solution is processed with copper powder followed by the precipitation of gold, and an insoluble precipitate is filtered from the resulting pulp, mainly gold slime with molybdic acid, then the precipitate is treated with water and 10% Solution of caustic sodium, with molybdenic acid dissolved and transferred to the solution in the form of sodium molybdate, and the gold sludge on the filter is washed with water, dehydrated and melted. The method makes it possible to obtain gold by a cheaper method and a high degree of recovery.
DESCRIPTION OF THE INVENTION
The invention relates to the treatment of precious metals from waste, in particular from gold-plated parts containing molybdenum.
Gold-plated details, based on molybdenum, are various products-bolts, wires, glasses, mesh, etc. The content of gold in them is from 1.5-5.0% .
A metal recovery method is known that includes a charge containing gold, molybdenum and other metals of the platinum group and combinations thereof, which is treated with a mixture of ammonium nitrate and sulfuric acid at a temperature of 105 ° C or higher ( PCT application No. 92/15713, cl. C 22 B 3/08, 1992 - analogue .
A disadvantage of this method is that the obtained insoluble precipitate is an enriched product in precious metals containing hardly soluble metals, including molybdenum, the negative influence of which will affect the extraction of precious metals from insoluble precipitate.
The closest in technical essence to the invention is a method for extracting gold from a material containing molybdenum, comprising treating the feedstock with a solution containing hydrogen iodide, iodine and water, and gold deposition ( U.S. Patent No. 4,397,690, cl. C 22 B 11/00, 1983 - prototype /.
The disadvantage of this method is the high cost of iodine and potassium iodide reagents, the incomplete recovery of gold in solution, the long process of dissolution and the difficulty of extracting gold from the solutions obtained, and then affixing it.
The technical result of the invention is the production of gold in a cheaper way and with a high degree of recovery.
The technical result is achieved due to the fact that the method of gold extraction, including the processing of the starting material and the deposition of gold , with the gold- containing raw material on a molybdenum basis treated with a solution of royal vodka, the resulting gold-containing solution is treated with urea, followed by separation of the precipitate by filtration and Washing it, then the washing water is combined with the gold- containing solution, the resulting solution is treated with copper powder with further gold precipitation, an insoluble precipitate is collected from the resulting pulp containing gold and molybdic acid, mainly gold slurry with molybdic acid, then the precipitate is washed with water and 10% Solution of caustic sodium, while molybdic acid dissolves and passes into the solution in the form of sodium molybdate, and the gold sludge on the filter is washed with water, dehydrated and melted.
EXAMPLE OF IMPLEMENTATION OF THE METHOD
The raw materials are loaded into the reactor, royal vodka is also fed there and the dissolution process is carried out until the reaction ceases completely, the following reactions occur:
Gold and other metals dissolve , while silver in the form of AgCl and ceramics form an insoluble residue, and molybdenum in the form of molybdic acid is in solution in a gel-like state.
To a gold-containing solution, a solution of urea / urea / for nitric acid binding is added in small portions with stirring.
Co (NH2) 2 + HNO3 → Co (NH2) 2 + HNO3.
The gold-containing solution is separated from the insoluble residue, which is washed with water, and the washings are combined with a gold- containing solution which is poured into a gold deposition vessel.
Gold is precipitated from a solution containing molybdenic acid H 2 MoO 4 , a copper powder:
2HAuCl 4 + 3Cu → 2CuCl 2 + 2HCl.
The pulp containing gold and molybdic acid is poured onto the nutch filter, the filtrate is separated and the gold sludge with molybdic acid is washed until a neutral reaction, and then washed with a further 10% sodium hydroxide solution, while the molybdic acid dissolves and passes into the solution as molybdate Sodium,
H 2 [MoO 4 ] + 2 NaOH ---> Na 2 MoO 4 + 2H 2 O,
And the gold sludge is washed with water until neutral reaction, dehydrates it, unloaded onto the nutch filter and melted.
CLAIM
A method for recovering gold, comprising treating the original gold-containing material on a molybdenum basis with a reagent solution and precipitating gold from the solution, characterized in that the treatment is carried out with a solution of royal vodka, the resulting gold-containing solution is treated with urea, followed by separating the precipitate by filtration and washing it, then combining the washings with gold-containing Solution, the obtained solution is treated with copper powder with further precipitation of gold from the resulting pulp containing gold and molybdic acid, an insoluble precipitate is filtered out, mainly gold slime with molybdic acid, washed with water and 10% sodium hydroxide solution, while molybdic acid dissolves And passes into the solution in the form of sodium molybdate, and the gold sludge on the filter is washed with water, dehydrated and melted.
print version
Date of publication 05.12.2006гг
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