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INVENTION
Patent of the Russian Federation RU1616159
METHOD OF EXTRACTION OF GOLD FROM CLAY ORE
The name of the inventor: Chernov V.K . ; Khomutov VV; Petukhova SN; Chervonin V.M.
The name of the patent holder: Irkutsk State Research Institute of Rare and Non-Ferrous Metals
Address for correspondence:
The effective date of the patent: 1989.01.12
The invention relates to the hydrometallurgy of noble metals, in particular to methods for extracting gold by cyanidation from clay ores. The purpose of the invention is to intensify the process and reduce losses of gold with the tails of the crystalline fraction. For this purpose, the ore containing 3.8 g / l gold and 35% clay is subjected to wet grinding and classified. Alloy and sands of the classifier are processed separately. From the sink, a fraction of 0.071 mm is isolated by hydrocycloning and screening, which is directed to sorption of gold, and saturated resin to electrolysis. Gold is recovering 49.8%. Sands of the classifier are re-grinded and reclassified from the classifier sink after hydrocycloning and screening. A fraction of 0.16 + 0.071 mm is isolated, which is subjected to sorption cyanidation followed by electrolytic gold recovery. Gold recovery from the crystalline phase is 37.7%. The total gold recovery is 86.6%, which is 1.6% higher than the prototype. The number of stages in the sorption cyanidation stage is reduced from 9 to 6.
DESCRIPTION OF THE INVENTION
The invention relates to the hydrometallurgy of noble metals, in particular to methods for extracting gold by cyanidation from clay ores.
The purpose of the invention is to intensify the process and reduce losses of gold with tails of the crystalline fraction.
Example
The initial ore containing 3.8 g / t gold, 35% clay, is subjected to crushing and subsequent grinding in the alkaline cyanide solution in the first stage in wet self-grinding mills. The resulting pulp, containing 30-35% of the sludge fraction with a dispersion of 0.071 mm and 15-20% of the fraction, 0.16 + 0.071 mm, is classified in a spiral classifier. The discharge of classifier 5 mm in size, containing 45-50% of the fraction - 0.71 mm and 10-15% of the fraction - 0.16 + 0.071 mm, is subjected to hydrocycloning in paired hydrocyclones 500 and 300 mm to obtain a sludge fraction and sands. Sands of hydrocyclones containing 20-30% of the fraction - 0.071 mm and 25-30% of the fraction - 0.16-0.071 mm, are returned to the first stage of grinding. The discharge of hydrocyclones containing 80-85% of the fraction - 0.071 mm and 10-15% of the fraction - 0.16 + 0.071 mm, is screened for separating the silt fraction with a dispersion of 0.071 mm with a gold content of 3.8 g / l. The drainage fraction - 0.071 mm thickens and the thickened product is directed to sorption with AM-2B resin. Sorption is carried out for 6 hours in six pachuks with 3-5% loading of resin. The saturated resin is then isolated and regenerated in a known manner. The commodity regenerate is directed to electrolysis to produce a cathode metal. The extraction of gold was 49.8%. Sands of the classifier with a size of 20 mm, content of 1-2% of the fraction - 0.071 mm and 2-3% of the fraction - 0.16 + 0.071 mm, are re-milled in the second and then in the third ball mill. The pulp of the second and third mill, containing 1-2% of the fraction is 0.071 mm and 30-35% of the fraction is 0.16 + 0.071 mm, up to 1% of the fraction is 0.071 mm and 20-25% of the fraction is 0.16 + 0.071 mm, respectively , Classify. The second step of the second stage coassicizers, containing up to 1% of the fraction - 0.071 mm and 30-35% of the fraction - 0.16 + 0.071 mm, and the third stage containing 1% fractions - 0.071 mm and 20-25% hydrocyclone in paired hydrocyclones. The discharge of hydrocyclones containing 1-2% of the fraction - 0.071 mm and 90-95% of the fraction - 0.16 + 0.071 mm, is screened with a crystal fraction of 0.16 + 0.071 mm with a content of 1.5 mg / l in the liquid phase Of gold. The drain is condensed and the condensed product is sent to the sorption leaching with AM-2B resin in a separate cycle from the sludge fraction. Sorption leaching is carried out in six flours for 6 hours when the resin is loaded 3-5% of the pulp. The saturated resin is recovered from the pulp, regenerated, the commodity regenerate is sent to electrolysis to produce a cathode metal. The recovery of gold from the crystalline fraction is 37.7%. The total extraction of gold in a commodity product is 86.6%. The sands of the product classification from the second and third mill, containing up to 1% of the fraction - 0.071 mm and up to 6% of the fraction - 0.16 + 0.071 mm, are cyanidized with a solution of 0.2 g / l, NaCN, washed of dissolved gold. The solution after cyanidation, containing 0.8 mg / l gold, is fed to the first mill to grind the starting product, from which it enters the sorption with silt (slurry), the cyanidation tailings into the dump. The essentiality of carrying out ore enrichment according to the proposed scheme to achieve the goal follows from the data of Table. 1, 2. Thus, the method of extracting gold from clay ores makes it possible, thanks to the separation of the silt fraction and its sorption in a separate cycle, to increase gold recovery by 1.6%. In addition, the process of gold extraction is intensified by facilitating the access of cyanide solution to gold minerals, the number of steps of sorption has been reduced from 9 to 6.
CLAIM
Method for extracting gold from clay ore, including grinding, hydraulic classification to obtain a sludge fraction and sands, re-grinding the sands to obtain a crystalline fraction, and sorption cyanidation to obtain tails, characterized in that, in order to intensify the process and reduce losses of gold with tails of crystalline Fractions, the classification is carried out with the separation of the silt fraction with a dispersion of 0.071 mm, followed by its sorption cyanidation.
print version
Date of publication 14.12.2006гг
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