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Verkhnyaya Pyshma, Russia

Novokshanova V.N.,Uralelektromed JSC | Lebed A.B.,Ural Mining and Metallurgical Company | Vasilev E.A.,Ural Mining and Metallurgical Company | Naboychenko S.S.,Ural Federal University
Tsvetnye Metally | Year: 2013

There was carried out the research of a heap leaching of copper from oxidized ore of Volkovskoe deposit with the height of a material layer of 2 and 4 m. There were defined the basic technological parameters of process with application of preliminary grinding stage. For 160 days of the process, there have been extracted 66.8% of copper from the material composition. With increasing of the layer height from 2 to 4 m without the preliminary granulation and decreasing of initial coarseness to -10+0 mm, there is observed the worsening of layer filtration ability. There is also proved the low application efficiency of ore granulation. For the purpose of copper release from the product leaching solutions, there are considered the methods of liquid extraction and cementation on the clinker of zinc production. After the extraction processing with application of extracting agent LIX 984N, the residual content of copper in solutions with sedimentation balance of 95-99%, was 3-5 mg/dm3. During the research of copper cementation sedimentation process, there was established the dependence of reagent waste from the coarseness of its grinding both on the initial clinker, and on the magnetic fraction after the dry separation. There was defined, that the usage of separated product makes it possible to obtain the sediments with bigger content of copper (to 18.7-19.4%). There were defined the parameters of clarification of suspension after the cementation sedimentation of copper with usage of flocculants, which make it possible to decrease the process durability to 10 minutes. The carried out testings have shown the adaptability of a heap leaching method to the processing of poor oxidized ores of Volkovskoe deposit, which makes it possible to increase the raw materials base of non-ferrous metallurgy and decrease the adverse environmental impact. Source

Mastyugin S.A.,Uralelektromed JSC | Mamyachenkov S.V.,Ural Federal University | Anisimova O.S.,Ural Federal University | Voinkov R.S.,Uralelektromed JSC
Tsvetnye Metally | Year: 2013

Technology of processing of slimes of Uralelectromed JSC includes a low-temperature sulphatization, drying of copper-less slime and its melting on a silver-gold alloy. Rather low extraction of precious metals, selenium and tellurium and considerable negative impact on environment are the disadvantages of existing flowsheet. In 2010, Institute Gipronikel JSC, together with Uralelectromed JSC, developed a new way of copper slime processing, including an autoclave oxidizing sulfuric-acid leaching with the subsequent flotation. This method makes it possible to obtain the following substances after the operational development:-flotation concentrate, containing not less than 90% of the total amount of precious metals, selenium and tellurium;-flotation tails, containing a lead-antimony concentrate, which includes tin, bismuth and contains a minimum quantity of noble metals. For the purpose of completion of this process flowsheet (in particular, extraction of earlier lost lead and antimony from flotation tails), there was offered and developed the way of processing of tails of anode slime flotation with obtaining of marketable products of lead and antimony, which extraction will be profitable, according to this technology. Laboratory researches on two-phase hydrometallurgical processing of tails of copper-electrolytic slimes flotation were carried out for extraction of non-ferrous metals in corresponding solutions and concentration of precious metals in cake. At the first stage, flotation tails were leached by the solution of complexing agent (Ethylenediaminetetraacetic acid-EDTA) for the purpose of extraction of lead in solution. As a result, there was a success in reaching of selective extraction of lead in solution at the level of 80-88%. At the second stage of flotation tails processing, the concentrated hydrochloric acid was used for lead antimonate opening. Extraction of lead, antimony and arsenic made up 92%, 87% and 99%, respectively. Obtained cake is concentrated by 8 times (according to the content of precious metals) and can be directed on further processing for extraction of these metals. Source

Selivanov E.N.,RAS Institute of Metallurgy | Popov A.I.,Uralelektromed JSC | Selmenskikh N.I.,RAS Institute of Metallurgy | Lebed A.B.,Uralelektromed JSC
Tsvetnye Metally | Year: 2013

Composition of non-metallic inclusions in blister copper in the process of fire refining has been evaluated by optical microscopy and X-ray spectrum microanalysis. Based on data of refining interface (slag/metal) impurities distribution their oxidation sequence has been determined under conditions of Uralelektromed JSC. Virgin samples have been selected in the process of copper oxidation, their oxygen content made up 0.47-0.64%. Two oxide inclusions types have been detected-Cu2O and PbO-Sb2O5-As2O5 as well as selenide-tellurides Cu?SeTeS in the form of copper-suspended particles. Major impurities portion are Cu2O particles the size of which increases in the process of oxidation from 0.5-4 nm to 10-40 nm. At the same time inclusions containing lead, arsenic, antimony, selenium, tellurium impurities decrease in size from 1-5 to 1-3 nm. In oxide particles PbO-Sb2O5-As2O5 lead content reaches 55.3%, antimony 24.8-35.2%, nickel 0.4-1%, arsenic 2.7-9.3% and sulfur 1.1-4.1%. It is assumed that impurities oxidation occurs due to copperdiluted oxygen. Copper selenium-telluride contains, % (mas.): 12.6-18.3 Se, 5.6-11.1 Te, 1.2-4.5 Pb, 0.9-1.5 Sb, 1.0-9.2 S. Based on composition and size of non-metallic inclusions oxides rise rate has been evaluated (?.) by Stokes and Rybchinsky-Adamar equations. Calculations demonstrated that rise rate of inclusions with the size 2-40 nm changes for Cu2O from 1.3.10-6 to 520.10-6 m/s, and rate of inclusions (?) Cu2O-PbO-Sb2O5-As2O5 is three times less. Low values of copper oxide particles rise rate are conditioned by high oxide density. Thus for rise of 4 nm PbO-Sb2O5-As2O5 particles from 0.5 m high copper melt two days are needed. Since stirring occurs in the process of oxidation, the rate of convection flows is on the level of 0.5 m/s, transition of oxide phases on the melt surface is practically impossible. Refining process intensification is possible by melt stirring and filtration as well as fusible slag forming. Source

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