scholarly journals Processing of Sulfide Copper-Nickel Ores from the Deposits in Murmansk Region by Heap Leaching

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 820
Author(s):  
Elena Yanishevskya ◽  
Nadezhda Fokina ◽  
Ekaterina Selivanova ◽  
Alena Kompanchenko ◽  
Dmitriy Makarov ◽  
...  
Keyword(s):  
Solid Phase ◽  
Copper Ions ◽  
Low Grade ◽  
Sulfide Ores ◽  
Acidophilic Microorganisms ◽  
X Ray ◽  
Copper Nickel ◽  
Murmansk Region ◽  
Nickel Ores ◽  
Iron Nickel

The feasibility of processing low-grade copper-nickel ores by heap bioleaching was investigated. It was found that an iron-oxidizing strain of acidophilic microorganisms, Acidithiobacillus ferrivorans, is effective in the leaching of sulfide ores from the deposits in Russia’s Murmansk region. Sulfide mineralization of the studied mineral feeds was described using the methods of X-ray phase analysis and optical microscopy. In the process of leaching, the pH and Eh values and the concentrations of ferric and ferrous iron, nickel, and copper ions were monitored. By the end of the experiment, 16.5% of nickel and 7.5% of copper was recovered from the ore of the Allarechensk technogenic deposit, while 22.5% of nickel and 12.7% copper were recovered from the ore of the Nud II deposit. By silicate analysis of the solid phase, patterns of ore chemistry change were described during the process of bioleaching.

scholarly journals Behavior of platinum in the system of the matte-slag in the processing of copper-nickel ores

2021 ◽  
pp. 16-16
Author(s):  
A. Amdur ◽  
E. Selivanov ◽  
S. Fedorov ◽  
V. Pavlov ◽  
S. Krasikov
Keyword(s):  
Size Effect ◽  
Buoyancy Force ◽  
Nickel Sulfide ◽  
Precious Metals ◽  
Adhesive Force ◽  
Thermodynamic Activity ◽  
Sulfide Ores ◽  
Copper Nickel ◽  
Nickel Ores ◽  
Iron Nickel

Copper-nickel sulfide ores are one of the main sources of platinum. One of the ways to extract precious metals from such ores involves melting of a concentrate in electric ore smelting furnaces, where the melt is divided into matte and slag. Platinum is generally concentrated in matte; however, some its part remains in the slag, thus leading to metal losses. In order to reduce platinum losses, the forms of platinum in these phases should be studied. It was found that during the melting of this ore, iron, nickel, and copper are reduced. The mineral composition of matte has been studied. Platinum in matte is present in the form of intermetallics with Fe and Ni. The PtFe intermetallic is a dispersed needle formation with a length of 20 to 500 ?m and a thickness of up to 10 ?m. The size effect is revealed: the content of platinum in the PtFe intermetallic decreases with decreasing the thickness of needle formations. The decreases in the content of platinum in dispersed needle formations can be explained by an increase in the thermodynamic activity and changing properties of the dispersed substance and a corresponding increase in solubility. It was found that matte drops, together with their associated platinum-containing particles of no more than 5-7 ?m in size, were carried into the slag by gas bubbles using flotation. The conditions for the rise of a matte drop, together with a bubble in the slag, consist in the fact that the adhesive force of the drop with the bubble and the buoyancy force acting on the bubble must be greater than the gravity of the drop.

scholarly journals Palladium tellurides and bismuthtellurides in sulfide copper-nickel ores of the Savabeisky ore occurrence (Nenets Autonomous District, Russsia)

LITOSFERA ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 574-594
Author(s):  
R. I. Shaybekov ◽  
B. A. Makeev ◽  
N. N. Kononkova ◽  
S. I. Isaenko ◽  
E. M. Tropnikov
Keyword(s):  
Raman Spectroscopy ◽  
Noble Metals ◽  
Electron Backscatter Diffraction ◽  
Integrated Approach ◽  
Analysis Data ◽  
X Ray ◽  
Copper Nickel ◽  
North East ◽  
Nickel Ores ◽  
First Time

Research subject. The Savabeisky sulfide copper-nickel ore occurrence, located in the central part of the Khengur (Central Pay-Khoy) gabbro-dolerite complex of the Pay-Khoy, within the Yugorsky Peninsula, located in the Far North-East of the European part of Russia, in the Arkhangelsk region, between the Barents and Kara Seas.Materials and methods. Samples of copper-nickel ores with noble metal mineralization were studied. Palladium tellurides and bismuthtellurides were characterized using optical and scanning electron microscopy, electron backscatter diffraction (EBSD), X-ray structural analysis and Raman spectroscopy.Results. Bismuthtellurides in the Paykhoysko-Vaigach-Yuzhnonovozemelskiy region – michenerite, merenskyite and unidentified palladium telluride of the kotulskite–merenskyite series with crystal formula Pd2(TeSbBi)3 – were found for the first time. The unit cell parameter of Pay-Khoy michenerite was calculated using X-ray diffraction analysis data: a = 6.638(2) Å. According to Raman spectroscopy, the palladium tellurides and bismuthtellurides of the Savabeisky ore occurrence were distinguished into 4 groups: Sb-kotulskite (does not contain Raman-active modes), unnamed PGM Pd2(TeSbBi)3 (bands in the range 95–103, 121–126 cm–1, obtained for the first time), Sb-merenskyite (band 126–135 cm–1), michenerite (bands with maxima 100 and 116 cm–1, obtained for the first time). The Kikuchi lines for michenerite and the mineral of the kotulskite–merenskyite series were obtained by the EBSD method.Conclusions. The diagnosis of palladium tellurides and bismuthtellurides is a rather complicated problem (wide variations in compositions, low hardness, small size, thin intergrowths of several individuals, the presence of impurities, etc.) affecting the determination of their mineral form and requiring an integrated approach. The Raman spectra of michenerite and unnamed PGM can be used as standards for the rapid identification of their natural forms, in contrast to EBSD, which requires improved sample preparation. The relatively high content of antimony in the ore minerals and noble metals minerals at the Savabeisky ore occurrence is the antimony metallogenic specificity characteristic of the entire Uralsko-Novozemelskiy province.

scholarly journals A Study of the Feasibility of Using Ammonium Sulfate in Copper—Nickel Ore Processing

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 422
Author(s):  
Andrey A. Goryachev ◽  
Elena V. Chernousenko ◽  
Sergey S. Potapov ◽  
Nikita S. Tsvetov ◽  
Dmitriy V. Makarov
Keyword(s):  
Ammonium Sulfate ◽  
Cost Effective ◽  
Process Conditions ◽  
Low Grade ◽  
Flotation Concentrate ◽  
Copper Nickel ◽  
Ore Processing ◽  
Nickel Ores ◽  
Roasting Temperature ◽  
Pregnant Solution

The possibility of applying a combined concentration and metallurgical method for processing low-grade and refractory copper–nickel ores was considered. The resulting rougher and scavenger flotation concentrate contained 2.07% nickel and 0.881% copper at a recovery of 85.44% and 89.91%, respectively. The concentrate was then roasted with ammonium sulfate, followed by aqueous leaching of clinker to dissolve nickel and copper. The roasting temperature, the ratio of concentrate to (NH4)2SO4 in the mixture, and the temperature were varied. Based on the study findings, the following process conditions were found to be optimal: roasting temperature 400 °C, rougher concentrate to ammonium sulfate ratio 1:7, and grinding size −40 μm. A roasting temperature of 400 °C is significantly lower than the temperature applied in conventional pyrometallurgical processes. The possibility of collecting off-gases allows the reagent to be regenerated and makes the process even more cost-effective. End-to-end recovery into pregnant solution was 81.42% for nickel and 82.81% for copper. The resulting solutions can be processed by known hydrometallurgical methods.

scholarly journals Determination of adhesion stages of the Fe-Ni ore at the Ferronikeli plant in Drenas

2020 ◽  
pp. 37-42
Author(s):  
Zarife Bajraktari-Gashi ◽  
Muharrem Zabeli ◽  
Erard Morina
Keyword(s):  
Point Of View ◽  
High Moisture Content ◽  
High Moisture ◽  
Economic Point ◽  
X Ray ◽  
Nickel Ores ◽  
Iron Nickel ◽  
Rotary Kilns ◽  
The University

Abstract: Purpose. The process of calcine production in rotary kilns at the Ferronikeli plant in Drenas is realized with great difficulties as a result of the formation of large adhesions in the areas of rotary kilns. So far, the removal of load adhesions during the work process inside the rotary kilns is achieved only by their physical removal. The purpose of the paper is to determine the factors in reducing adhesions in the process of calcine production in the areas of rotary kilns, in the Ferronikeli plant in Drenas. Methodology. Chemical analysis of iron-nickel ore. The determination of the composition of the adhesives was performed with the X-RAY device, in the laboratory of the Ferronikeli plant. Method with the software Calphad 2020, at the University of Ljubljana. Findings. From the composition of iron-nickel ore, the composition of adhesives in rotary kilns, we manage to determine the thermodynamic phases and exothermic and endothermic processes that take place in the process of rotary kilns. From the determinations of the composition of the adhesives in the software alphad 2020, we manage to determine one of the factors that affect the formation of adhesives based on the stages during the process, which do not have a stability, as a result of high moisture content of iron-nickel ores. Originality. Based on the study at the Ferronikeli plant, shovels were placed on the walls of the rotary kilns in the three areas, the removal of fireclay bricks, the placement of anchored concrete and the project for the placement of two kilns for kiln ore were started. Practical value.The placement of the shovels has increased the temperature inside the rotary kilns. While the placement of dryers will have an impact on reducing the adhesions inside the rotary kilns and from the economic point of view, we will have a reduction of fuels in the load of the rotary kilns.

Pentlandite phase relations in the Fe–Ni–S system and notes on the monosulfide solid solution

1970 ◽  
Vol 7 (1) ◽  
pp. 67-85 ◽  
Author(s):  
R. W. Shewman ◽  
L. A. Clark
Keyword(s):  
Solid Solution ◽  
Interplanar Spacing ◽  
Weight Ratio ◽  
Solid State Reactions ◽  
Monosulfide Solid Solution ◽  
Modulated Structure ◽  
X Ray ◽  
Nickel Ores ◽  
Iron Nickel ◽  
Approximate Composition

A curve relating composition of synthetic pentlandite with interplanar spacing was determined experimentally as follows: d115 = 1.9407 – 0.0023x + 0.0077x2, where x represents the iron to nickel weight ratio with d115 measured in Å and the sulfur content is fixed at 33.05 wt %. The following iron, nickel, and sulfur solid solubility limits of pentlandite were determined:[Formula: see text]X-ray powder patterns of monosulfide solid solution heated at 500 and 400 °C with a composition (wt %) of 18.8 Fe, 43.8 Ni and 37.4 S showed a modulated structure. A solvus interrupts the monosulfide solid solution at 275 ± 10 °C and the approximate composition in wt %: Fe = 22.5, Ni = 40, and S = 37.5.The relatively common occurrence of the pyrite–pentlandite assemblage in nickel ores shows that the solid state reactions attendant upon cooling of these ores, proceed to temperatures at least below 200 °C.

scholarly journals Functional activity of microorganisms in mining and processing of copper-nickel ores in the Murmansk Region

Vestnik MGTU ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 109-116
Author(s):  
N. V. Fokina ◽  
◽  
E. S. Yanishevskaya ◽  
A. V. Svetlov ◽  
A. A. Goryachev ◽  
...  
Keyword(s):  
Functional Activity ◽  
Copper Nickel ◽  
Murmansk Region ◽  
Nickel Ores

Direct Observation of Crystalline Ordering In Naturally Graphitized Carbon Produced by Low Grade Metamorphism

1977 ◽  
Vol 35 ◽  
pp. 162-163
Author(s):  
Thomas R. McKee ◽  
Peter R. Buseck
Keyword(s):  
Crystallite Size ◽  
Sedimentary Rocks ◽  
Carbonaceous Material ◽  
Low Grade ◽  
X Ray ◽  
Graphitized Carbon ◽  
Transmission Electron ◽  
Heat Treated ◽  
Commercial Carbon ◽  
Metamorphic Zone

Sediments commonly contain organic material which appears as refractory carbonaceous material in metamorphosed sedimentary rocks. Grew and others have shown that relative carbon content, crystallite size, X-ray crystallinity and development of well-ordered graphite crystal structure of the carbonaceous material increases with increasing metamorphic grade. The graphitization process is irreversible and appears to be continous from the amorphous to the completely graphitized stage. The most dramatic chemical and crystallographic changes take place within the chlorite metamorphic zone.The detailed X-ray investigation of crystallite size and crystalline ordering is complex and can best be investigated by other means such as high resolution transmission electron microscopy (HRTEM). The natural graphitization series is similar to that for heat-treated commercial carbon blacks, which have been successfully studied by HRTEM (Ban and others).

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