autoclave leaching
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Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 84
Author(s):  
Claudio A. Leiva ◽  
María E. Gálvez ◽  
Gerardo E. Fuentes ◽  
Claudio A. Acuña ◽  
Jannan A. Alcota

Autoclave leaching of zinc concentrate (Sphalerite) is an environmentally friendly process compared to roasting, which discharges pollutants into the atmosphere. Due to the amount of iron in the final product, a study is proposed to evaluate different reagents for eliminating iron from the autoclave outcome, minimizing Zn losses. The colloid formation, zinc losses, iron removal, phase separation stage characteristics (sedimentation and filtering), and reagent costs were used to evaluate six-iron precipitating reagents: CaO, Na2CO3, CaCO3, NaOH, MgO, and Ca(OH)2. CaO shows 99.5% iron removal and 87% zinc recovery. Although CaO was one of the reagents with significant zinc recovery, it presented operational difficulties in the filtration stage due to the high viscosity of the mixtures. Finally, Ca(OH)2 is the reagent recommended due to its ease of use, zinc yield recovery, electrowinning efficiency, and iron precipitate filtration rate. Zinc recovery was above 80%, while the iron concentration in the solution was below 50 ppm.


Author(s):  
Светлана Александровна Бибанаева ◽  
Владимир Михайлович Скачков

Работа посвящена изучению влияния моно- и сложносоставных металлических добавок на процесс переработки бокситов гидрощелочным способом. Изучен химический качественный и количественный состав, морфология красных шламов (КШ) полученных в условиях автоклавного высокотемпературного выщелачивания. Проведены рентгенофазовые исследования, направленные на определение состава и структуры соединений в красном шламе. Показана перспективность метода автоклавного выщелачивания трудновскрываемых бокситов с одновременным извлечением глинозема и конверсии гематита в магнетит газообразным водородом. Установлено, что способ позволяет переработку бокситов с высокой степенью извлечения глинозема и позволяет получать красные шламы с различным содержанием магнитной фракции и низким содержанием натрия. Полученный магнетизированный красный шлам пригоден для переработки с помощью магнитной сепарации и делает перспективным сырьем для черной металлургии. Определена зависимость степени конверсии гематита в магнетит от вида восстанавливающего агента. По результатам исследований был получен патент на изобретение. The work is devoted to the study of the influence of mono - and composite metal additives on the process of processing bauxite by the hydro-alkaline method. The chemical qualitative and quantitative composition, morphology of red mud (RM) obtained under conditions of autoclave high-temperature leaching were studied. X-ray phase studies aimed at determining the composition and structure of compounds in red mud were carried out. The prospects of the method of autoclave leaching of hard-to-open bauxites with simultaneous extraction of alumina and conversion of hematite to magnetite by hydrogen gas are shown. It was found that the method allows the processing of bauxite with a high degree of alumina extraction and allows to obtain red mud with different magnetic fraction content and low sodium content. The resulting magnetized red mud is suitable for processing by magnetic separation and makes it a promising raw material for the ferrous metallurgy. The dependence of the degree of conversion of hematite to magnetite on the type of reducing agent is determined. According to the results of the research, a patent for the invention was obtained.


2021 ◽  
pp. 86-91
Author(s):  
V. V. Golovko ◽  
E. Yu. Meshkov ◽  
V. G. Litvinenko

Priargun Mining and Chemical Association has been producing uranium in the Streltsov ore field for more than 50 years. The main ore bodies with high content of uranium have been mined out during this period of time, and the uranium content has dropped in ore which is currently extracted. In connection with this, appraisal of the mineral resources and mineral reserves of Priargun MCA has been accomplished. The Argun ore is composed of a few process types—iron silicate and uranium, silicate–uranium–molybdenum, carbonate and uranium, carbonate and molybdenum, carbonate–uranium–molybdenum and rebellious ore (contains zirconium and brannerite). It is required to undertake technology-based rating and certification of the Argun ore. The autoclave leaching technology is found to be higher economically efficient as against the atmospheric leaching technology due to lower operating expenses. From the preliminary studies, four samples of anion-exchange resins are recommended for further testing: A500Y, BM77-14, D299 and Ambersep 920UXL SO4. These ion-exchangers were used to analyze their influence on sorption–desorption of uranium and molybdenum. All these ion exchangers had preserved their sorption capacity in 10 sorption–desorption cycles. Based on the studies into adsorption of uranium and molybdenum from leached slurry at the Argun deposit, the optimal sorbent for extraction and separation of uranium and molybdenum is Ambersep 920UXL SO4. Producibility of natural uranium to meet ASTM C 967-13 standards is analyzed on a laboratory scale. The produced uranium concentrate contains much less impurities than it is stipulated by International Standard Specification ASTM С 967-13. The action chart of processing of carbonate ore from the Argun and Zherlovoe deposits is developed and economically justified.


Author(s):  
O. B. Kolmachikhina ◽  
O. Yu. Makovskaya ◽  
V. G. Lobanov ◽  
S. E. Polygalov

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.


Author(s):  
Yelena Panova ◽  
Yenlik Abzhan ◽  
Aisulu Zhussupova

Molybdenum is one of the most important uranium-related metals. In the ores of many deposits, the molybdenum content is comparable to the uranium content. The processing of complex uranium-molybdenum ores is based on the methods of acid and soda autoclave leaching, in which uranium and molybdenum pass into solution. At the present time, the associated extraction of molybdenum by the sorption method has been developed and introduced. In this case, the capacity of ion exchangers with respect to uranium and molybdenum substantially depends on the salt composition of the medium. The aim of this work is to study the sorption of molybdenum from a carbonate leach solution on BD-301G-I anion exchange resin in the presence of the most common anionic impurities in industrial solutions. Studies of the sorption capacity of anion exchange resin with respect to molybdenum were carried out under static conditions with stirring of the solution with the sorbent during eight hours. Sorption of molybdenum was carried out from carbonate solutions with the corresponding given concentrations of impurity components. According to the results of studies, it was found that, according to the strength of the depressing effect, the considered anions arranged in the following row: S2O32- > NO3- > Cl- > SO42- > HCO3- > CO32- > PO43-. The results of this study can be used to further study the sorption of molybdenum from real industrial solutions of carbonate leaching.


2020 ◽  
Vol 989 ◽  
pp. 537-542
Author(s):  
Kirill A. Karimov ◽  
Aleksei V. Kritskii ◽  
Sergey E. Polygalov

Monometallic ore that is mostly lead found in nature is extremely rare. The main natural raw material for the lead production is sulfide polymetallic ores. In this study the filter cake processing after the low-temperature autoclave leaching of the lead concentrate to produce a sulphide concentrate and lead tailings was investigated The study of component separation was carried out using the methods of mathematical planning of the second order experiment. The following optimal costs of reagents, g/t: 140-200 potassium xanthate, 70-100 foaming agent, 100 copper sulfate; the concentrate yield is 41-43 %; it is extracted to, %: 95 Fe, 49 Cu, 96 Zn, 98 S0, 18-19 Pb. At flotation 18,7% of lead goes into flotation concentrate and 80.5% is lead sulfate. The rectification of the obtained concentrate by flotation did not give acceptable results, since the yield of the foam product in all experiments was 93-96%. For the separation of lead sulphate from sulphur-sulfide concentrate was used in the granulation of sulfur in the following conditions: t = 145 °C, Po2 = 0,0-0,5 MPa, τ = 60 to 120 min. In the granulation process of the flotation concentrate is a division of lead sulfate and elemental sulfur, the sulfate lead content in sulphur-sulfide phase is decreased from 28.44 % to 3.5 %, its recovery in a sulfate filter cake has reached 90.6 %


Metallurgist ◽  
2019 ◽  
Vol 62 (11-12) ◽  
pp. 1244-1249 ◽  
Author(s):  
K. A. Karimov ◽  
S. S. Naboichenko ◽  
A. V. Kritskii ◽  
M. A. Tret’yak ◽  
A. A. Kovyazin

2019 ◽  
Vol 946 ◽  
pp. 615-620 ◽  
Author(s):  
Anton Kovyazin ◽  
Konstantin L. Timofeev ◽  
Sergey Krauhin

At present, arsenic content in copper concentrates is increasing, which leads to an increase in its content in all smelting products, the largest amount of arsenic is transferred in fine dust (dust composition,%: 10-12 Zn, 11-13 Pb, 8-15 Cu , 12-14 Fe, 5-10 As). Autoclaved leaching of dusts (temperature 160-200 °C, oxygen pressure 0.4-0.8 MPa, molar ratio H2SO4 /(Cu + Zn) = 0.75-2.25) to obtain a copper-zinc solution and a cake containing arsenic, iron and lead was studied. Copper extraction in the solution reaches 92%, zinc 95%. Lead, arsenic and iron are concentrated in the cake. Lead from cake is extracted by leaching in sodium chloride solution (temperature 60-70 ° C, NaCl concentration 300 g / dm3). The extraction of lead into the solution is 95%, subsequently lead is precipitated as lead carbonate.


2018 ◽  
Vol 10 (2) ◽  
pp. 270-280
Author(s):  
Andrei SOLODENKO ◽  
◽  
Vladimir VASILIEV ◽  
Alexander SOLODENKO ◽  
Maxim SEREBRYAKOV ◽  
...  
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