16 research outputs found

    Oxidized Nickel Ore and Galvanic Sludge Combined Treatment Investigation

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    Galvanic sludges have been accumulated in large quantities in Ural region. These materials contain low concentration of non-ferrous metals (nickel, zinc, chromium) and iron, and are not being processed. Another difficult for treatment nickel containing materials are oxidized nickel ores, deposits of which are located in Ural. However, the nickel ores aren't processed due to low economic efficiency. In this article simultaneous treatment of oxidized nickel ore and galvanic sludge was investigated. The proposed technology includes nickel ore sulfatization at high temperature in presence of sulfuric acid and further water leaching. Therefore, maximum nickel extraction in solution at leaching of oxidized nickel ore after sulfatization was 82 %. Solutions after leaching are neutralized by nickel containing galvanic sludge. Due to partial nickel chromite dissolution in sulfuric acid a total nickel concentration has been substantially increased. Selective nickel extraction from such solutions is possible by sorption methods, and further metal nickel obtaining - by electrowinning. © Published under licence by IOP Publishing Ltd

    Research of the Technology of Joint Processing of Stale Copper-Smelting Slags and Pyrite Cinders with the Extraction of Non-Ferrous Metals into a Commercial Product

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    The article deals with the problems of slags processing from copper-smelting production, both current production and those which had been accumulating over many years of enterprises' activity in heaps (stale). There are data about possible methods of slag processing. It is proposed a technology for the joint processing of stale copper-smelting slags of the Urals and pyrite cinders (waste from the production of sulfuric acid) - smelting with obtain a poor matte, into which copper and precious metals will be transferred. The results of scientific research on matte melting are presented. It is shown that when the ratio in the furnace charge "stale slag: pyrite cinder"at the level of 2.5, the extraction of non-ferrous metals into the matte is at the level of 90%. © Published under licence by IOP Publishing Ltd

    Research of Possibility of Processing of Oxidized Nickel Ore by Chloride Sublimation Roasting Technology

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    Oxidized nickel ores (ONO) contain most of the world's nickel reserves. However, choice of a cost-effe nickel ore processing technology is difficult due to the dispersed distribution of nickel compounds in refractory minerals, low nickel content, presence of a large amounts of consuming host rocks, and impossibility of beneficiation by conventional physicochemical methods. The paper presents studies on the ONO processing technology by means of chloride sublimation roasting. Sodium and calcium chlorides were used as chlorinating agents both individually and in various ratios. It has been shown that roasting allows for nickel and cobalt conversion into chloride form followed by selective distillation of the resulting compounds into the gas phase by 89 - 90% at a roasting temperature of 1100 C. © Published under licence by IOP Publishing Ltd

    Nickel sorption from solutions with high salt concentration

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    The object of the study is salt concentrates formed as a result of treatment of concentrated acidic and alkaline wastewater of galvanic processes, realized on Ural Optical & Mechanical Plant (Russia). Salt concentrates are to be disposed of as low-hazard substances, but periodically the presence of nickel ions in them was detected. Concentration of nickel ions reaches up to 0.3 g/L, the total salt content reaches 200 g/L. The possibility of sorption purification of salt concentrates from nickel on the aminocarboxylicionite Lewatit TP 207 was studied, and the capacitance characteristics of the ionite were determined. It is shown that a high salt background does not reduce the ion exchange capacity of ionite for nickel. The dynamic capacity of Lewatit TP 207 before the breakthrough was 0.155 g/g. Nickel desorption is carried out with 20% sulfuric acid. The maximum concentration of nickel in the eluates was 25.484 g/L. Such eluates can be returned to the nickel-plating bath. The technology of periodic ion-exchange purification of salt concentrates is proposed. © Published under licence by IOP Publishing Ltd

    Method for Extracting Gold from Gold-Containing Raw Materials

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    FIELD: hydrometallurgy. SUBSTANCE: invention relates to hydrometallurgy and can be used in the extraction of gold from gold-containing raw materials. The extraction of gold from gold-containing raw materials includes the treatment of raw materials with a leaching solution containing acid, sodium chloride and a chlorine-containing oxidizer, which is used as chloroisocyanurates. The leaching solution has a pH of 4-6. During the processing of raw materials, the oxidative potential of the leaching solution is controlled and maintained in the range of + 0.7-1.3 V by introducing hydrogen peroxide into the leaching solution. EFFECT: method makes it possible to improve environmental performance in the processing of gold-containing raw materials while reducing the consumption of chlorine-containing reagents by 1.5-2 times. 1 cl, 1 dwg, 1 ex.Изобретение относится к гидрометаллургии и может быть использовано при извлечении золота из золотосодержащего сырья. Извлечение золота из золотосодержащего сырья включает обработку сырья выщелачивающим раствором, содержащим кислоту, хлорид натрия и хлорсодержащий окислитель, в качестве которого используют хлоризоцианураты. Выщелачивающий раствор имеет рН 4-6. В ходе обработки сырья контролируют и поддерживают окислительный потенциал выщелачивающего раствора в диапазоне + 0,7-1,3 В путем введения в выщелачивающий раствор пероксида водорода. Способ позволяет улучшить экологические показатели при переработке золотосодержащего сырья при сокращении расхода хлорсодержащих реагентов в 1,5-2 раза. 1 ил., 1 пр

    Двухстадийное солянокислое выщелачивание окисленной никелевой руды Серовского месторождения

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    Significant reserves of oxidized nickel ores are concentrated in the Ural region, in the deposits of various sizes that are mined by open-pit method. Ore is rather loose, which makes the cost of production relatively low. At the same time, the technologies employed at Ural nickel plants fail to meet the energy conservation requirements, and they are environmentally unfriendly and unprofitable. The paper proposes a two-stage hydrometallurgical technology for processing oxidized nickel ores from the Serovsky deposit. The composition of investigated ore is, wt.%: 1.01 Ni, 0.031 Co, 15.32 Fetotal, 8.51 Al2O3, 21.76 MgO, 43.97 SiO2. The phase composition of the sample was determined by powder diffraction on the XRD-7000 X-ray diffractometer (Shimadzu, Japan). Serpentine Mg6[Ni, Si4O10](OH)8 and nimite (Ni, Mg, Al)6(Si, Al)4О10(OH)8 were identified as the main nickel-containing minerals. Nickel enters the crystal lattice of silicates and replaces magnesium and iron isomorphically, which significantly complicates the disintegration of such minerals by the hydrometallurgical method. The paper provides the results of laboratory studies into atmospheric ore leaching with hydrochloric acid at the first stage and autoclave leaching of the obtained slurry at the second stage depending on temperature, leaching time and acid consumption. The total (in two stages) extraction into the solution was, wt.%: 82 Ni, 73.6 Co, 22 Fe, 22 Mg, 50.4 Al. Hydrochloric acid is almost completely consumed under these conditions with residual acid concentration of about 3 g/dm3. The autoclave slurry has good filterability. Cake composition after autoclave leaching is as follows, wt.%: 0.35 Ni, 0.01 Co, 12 Fetotal, 10.63 Mg, 1.2 Al, 55 SiO2.В Уральском регионе сосредоточены значительные запасы окисленных никелевых руд как в крупных, так и в небольших месторождениях, которые разрабатываются открытым способом. Руда достаточно рыхлая, что делает стоимость добычи относительно невысокой. В то же время технологии, используемые на уральских никелевых заводах, не удовлетворяют требованиям энергосбережения и экологии и являются убыточными. В работе предложена двухстадийная гидрометаллургическая технология переработки окисленных никелевых руд Серовского месторождения. Исследована руда следующего состава, мас.%: 1,01 Ni, 0,031 Co, 15,32 Feобщ, 8,51 Al2O3, 21,76 MgO, 43,97 SiO2. Фазовый состав пробы установлен методом порошковой дифракции на рентгеновском дифрактометре XRD-7000 («Shimadzu», Япония). Основными никельсодержащими минералами идентифицированы серпентин Mg6[Ni, Si4O10](OH)8 и нимит (Ni, Mg, Al)6(Si, Al)4О10(OH)8. Никель входит в кристаллическую решетку силикатов, изоморфно замещая магний и железо, что существенно затрудняет вскрытие таких минералов гидрометаллургическим способом. Приведены результаты лабораторных исследований атмосферного выщелачивания руды соляной кислотой (на первой стадии) и автоклавного выщелачивания полученной пульпы (на второй) в зависимости от температуры, продолжительности выщелачивания и расхода кислоты. Суммарное (по двум стадиям) извлечение в раствор составило, мас.%: 82 Ni, 73,6 Co, 22 Fe, 22 Mg, 50,4 Al. Соляная кислота в данных условиях расходуется практически полностью – ее остаточная концентрация составила около 3 г/дм3 . Автоклавная пульпа обладает хорошей фильтруемостью. Состав кека после автоклавного выщелачивания, следующий, мас.%: 0,35 Ni, 0,01 Co, 12 Feобщ, 10,63 Mg, 1,2 Al, 55 SiО2

    Study of slimes of galvanic production as a promising secondary technogenic material

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    In this work, we were studied sludge galvanic production. Completed phase and chemical analysis of raw materials. An assessment of the possibility of galvanic processing.В работе были изучены шламы гальванического производства. Выполнен фазовый и химический анализ сырья. Проведена оценка возможности переработки гальваношламов

    Method for Processing Zinc Cakes

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    Изобретение относится к цветной металлургии и может быть использовано при переработке кеков, образующихся при извлечении цинка из сульфидных концентратов. Цинковые кеки выщелачивают с наложением СВЧ энергии при температуре 75°С раствором, содержащим 100 г/л серной кислоты в присутствии восстановителя, в качестве которого используют формиат натрия, и хлорид натрия с концентрацией 5-20 г/л. Способ позволяет интенсифицировать процесс выщелачивания. 2 табл., 1 пр.FIELD: non-ferrous metallurgy. SUBSTANCE: invention relates to non-ferrous metallurgy and can be used in the processing of cakes formed during the extraction of zinc from sulfide concentrates. Zinc cakes are leached with the application of microwave energy at a temperature of 75°C using a solution containing 100 g/l of sulfuric acid in the presence of a reducing agent, as which sodium formiate is used, and sodium chloride with a concentration of 5-20 g/l. EFFECT: method makes it possible to intensify the leaching process. 1 cl, 2 tbl, 1 ex

    Method for Processing Oxidized Nickel-Cobalt Ore

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    FIELD: metallurgy. SUBSTANCE: invention relates to non-ferrous metallurgy and can be used in the extraction of nickel and cobalt from oxidized nickel-cobalt ores. The ore is mixed with sulfuric acid, the mixture is heat treated, nickel and cobalt are leached from the heat treatment product with water, and nickel and cobalt are separated from the productive solutions. Heat treatment of a mixture of ore and sulfuric acid is carried out in a microwave oven at a temperature of 200-250°C for 10-15 minutes in an atmosphere of water vapor. EFFECT: method reduces the duration of sulfatization 10-15 times, and energy consumption 5-10 times. 1 cl, 1 dwg.Изобретение относится к металлургии цветных металлов и может быть использовано при извлечении никеля и кобальта из окисленных никель-кобальтовых руд. Проводят смешение руды с серной кислотой, термическую обработку смеси, выщелачивание водой никеля и кобальта из продукта термической обработки и выделение никеля и кобальта из продуктивных растворов. Термическую обработку смеси руды и серной кислоты проводят в СВЧ-печи при температуре 200-250 °С в течение 10-15 мин в атмосфере водяного пара. Способ позволяет сократить продолжительность сульфатизации в 10-15 раз, а энергозатраты в 5-10 раз. 1 ил

    Method for Extraction of Platinum Metals from Catalysts

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    Изобретение относится к области металлургии вторичного сырья благородных металлов, в частности к способу переработки использованных катализаторов на керамической основе, состоящих из оксидов алюминия, кремния, циркония, других металлов и содержащих металлы платиновой группы. Способ включает измельчение катализаторов, перемешивание с флюсами и дисперсной медью, плавку с коллектированием платиновых металлов медью, разделение медного сплава и шлака, выделение платиновых металлов из медного сплава. Медный сплав отливают в форме анодов и подвергают анодному растворению в сернокислом электролите. При этом платиновые металлы образуют шлам, а медь восстанавливается на катоде в виде порошка. Порошок отделяют от электролита и возвращают на плавку новой порции катализаторов. Обеспечивается сокращение расхода меди при переработке катализаторов в 3-4 раза. 1 з.п. ф-лы, 1 табл.FIELD: metallurgy. SUBSTANCE: invention relates to the field of metallurgy of secondary raw materials of noble metals, in particular to a method for processing used ceramic-based catalysts consisting of oxides of aluminum, silicon, zirconium, other metals and containing platinum group metals. The method includes grinding catalysts, mixing with fluxes and dispersed copper, melting with collecting platinum metals with copper, separating the copper alloy and slag, separating platinum metals from the copper alloy. The copper alloy is cast in the form of anodes and subjected to anodic dissolution in a sulfuric acid electrolyte. In this case, platinum metals form a sludge, and copper is reduced at the cathode in the form of a powder. The powder is separated from the electrolyte and returned to the smelting of a new portion of the catalysts. EFFECT: invention provides a reduction in copper consumption during the processing of catalysts by 3-4 times. 2 cl, 1 tbl
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