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pentlandite in the ore occurs as exsolutions in the pyrrhotite and the grain sizes ranges from 8 to 38µm. about 25% of the nickel bearing pentlandite is medium grained and subhedral.
The ore sample investigated was the Ni-Cu sulphide ore from Voisey's Bay, which indicated an excellent pentlandite-pyrrhotite selectivity with the combined use of SMBS and TETA. However, under the conditions of highly efficient pentlandite-pyrrhotite separation, the flotation of chalcopyrite was noted to be slowed down.
The extraction of nickel (Ni) from sulfide resources commences with flotation to produce a concentrate which is then smelted to produce a nickel-enriched phase called matte, and further refined to …
Nickel mined in the world include sulfide ore and oxide ore. Nickel also occurs in seabed manganese nodules. Secondary nickel resources play an increasingly …
The aim of the study was to investigate whether there is any compositional variation of pentlandite particles from the flotation concentrate samples and selected …
The sulfide-rich BIC and MSZ mostly have underground mines that produce ore that is treated by conventional ... Numerous accounts exist on the alteration mechanisms of the main PGM host base metal sulfides which are pentlandite ... An overview of Southern African PGM smelting. In: Donald J, Schonewille R (eds) Nickel …
Nickel ore refers to the naturally occurring rocks or minerals that contain significant amounts of nickel. Nickel is a chemical element with the symbol Ni and atomic number 28. It is a silvery-white metal with a relatively high melting point and excellent corrosion resistance. Nickel is commonly found in the Earth's crust, but it is typically …
The most important nickel minerals in sulfide ore are pentlandite [(Ni, Fe) 9 S 8] and nickel-containing pyrrhotite [(Ni, Fe) ... In smelting, add the roasted ore and flux into the low-shaft electric furnace for heating and smelting, remove the slagging of iron oxide and quartz flux in the roasted ore, and remove some other impurities. ...
The majority of the platinum-group elements in the Merensky ore are associated with pentlandite [(Fe,Ni) 9 S 8], occurring either in pentlandite grains or at the pentlandite–gangue grain boundaries (Peyerl, 1983, Jones, 1999). Palladium and rhodium are the PGEs contained mostly in pentlandite (Peyerl, 1983, Cabri, 1992, Godel et al., …
Raw pentlandite-bearing ore from the Levack mine (Ontario, Canada) was subjected to oxidative roasting in the air atmosphere. A chemical analysis of the initial sample was conducted according to ...
Currently, the main smelting processes of nickel sulfide ore involve flash smelting and pool smelting [19] [20] [21][22]. Spraying the deeply dehydrated powder concentrate from the top into the ...
Other important classes of ore are the laterites, which are the result of long weathering of peridotite initially containing a small percentage of nickel. Weathering in subtropical climates removes a major portion of the host rock, but the contained nickel dissolves and percolates downward and may reach a concentration sufficiently high to make mining economical.
The ore body is continuous for about 24 miles. The horizon exposed in the Johns-Manville West Fork exploration adit has an average grade of 0.47 oz Pt-Pd per ton with a Pd-to-Pt ratio of about 3.5:1. The mineralization occurs in sulfide-rich anorthositic rocks. Accessory minerals include pyrrhotite, pentlandite, pyrite, chalcopyrite, and …
In 90% of all copper-nickel ores mined for nickel smelting, pentlandite is present, they also contain a lot of copper, cobalt, platinum, and other valuable metals. Chalcopyrite or copper pyrite The mineral of a fine crystalline form of golden yellow color was named "golden blende" for its similarity to scarlet gold, has a bright metallic luster ...
16.2. Separation of Chalcopyrite and Pentlandite 16.3. Industrial Practice 16.4. Grinding 16.5. Summary 17. Smelting of Nickel Sulfide Concentrates by Roasting and Electric Furnace Smelting 17.1. Principles of Roasting and Smelting 17.2. Chemistry of Roasting 17.3. Electric Furnace Smelting 17.4. Industrial Electric Furnaces 17.5. Summary 18.
The effect of high intensity conditioning before flotation on hydrophobic flocculation of sulfide minerals and its relationship with flotation of low-grade copper-nickel sulfide ore were ...
In batch tests on an ore containing pentlandite, pyrrhotite, pyrite and talc the procedure rejected 57% of the iron sulphides and 98% of the talc and recovered 81% of the nickel in a concentrate assaying 16.5% Ni. ... ores frequently contain high levels of pyrrhotite which if concentrated with pentlandite raise SO2 emissions during smelting ...
We study the mechanism and kinetics of pentlandite oxidation in nickel pyrometallugy. Pentlandite oxidation follows a four-step reaction sequence. Reaction …
P entlandite (Ni,Fe) 9 S 8 is the major ore source of the world's nickel supply.[] During the past decades, pentlandite and the alteration of the mineral have been well studied.[2–11] The structure of pentlandite is based on the pseudo cubic-closest-packing of sulfur atoms with cations occupying ( frac{1}{8} ) of the available octahedral …
violarite, while nickel recovery may be improved if it is possible to transform violarite back to pentlandite. Figure 1: Occurrences of violarite in ore deposits. (a) Violarite forming as exsolution from pentlandite. Mt Keith Nickel Mine, WA. (b) Violarite forming during the weathering of pentlandite along rims and cracks of pentlandite crystals.
In flash smelting, nickel ore concentrate containing less than 1% moisture is fed to the furnace along with preheated air, oxygen-enriched air (30–40% oxygen), or pure …
In some nickel ore smelting, slag formation is complex because of the presence of MgO in various silicate minerals. The slag is typically iron and silicarich, but with elevated MgO levels. ... A mixture of four acidophilic thermophiles was used to bioleach a low-grade nickel–copper sulfide ore containing pentlandite, chalcopyrite, and ...
Nickel sul Rde minerals such as pentlandite can, in general, be separated from their gangue by Sotation using a thiol group of collectors like xanthates and alkyl …
2 ROASTING OF SULFIDE MINERALS In addition to common metals like copper, lead, zinc, and nickel a number of other metals such as antimony, bismuth, cadmium, cobalt, mercury, and molybdenum
The influence of ore mineralogy and ore texture on flotation response was studied for 29 samples from the main mineralised zone at Pit 3 of the Nkomati Ni mine, through laboratory scale flotation ...
Mineable platinum group metal (PGM) deposits are rare and found in relatively few areas of the world. At the same time, the use of PGM is predicted to expand in green technology and energy applications, and PGMs are consequently currently listed as European Union critical metals. Increased mineralogical complexity, lower grade ores, …
An ore is a mineral which has a valuable metal inside it. Ores are usually extracted by being mined.They can sometimes be found on the Earth's surface. Most ores are chemical compounds such as oxides or sulfides.There are different ways to get the metal out of the ore, which is called smelting. Iron ore, for example, is smelted in a blast furnace
In nature, violarite forms either by exsolution during the cooling of pentlandite ((Fe,Ni)9S8; Figure 1a) or, more commonly, by the oxidation of pentlandite in the supergene zone (Figure 1b).
The roasting of sulfide ores and concentrates is one of the most important steps in pyrometallurgical metal production from primary raw materials, due to the necessity of excess sulfur removal, present in the material. Pentlandite is one of the main sources for nickel pyrometallurgical production. The knowledge of its reaction …
"A new hydrometallurgical process for nickel extraction from a low grade laterite ore such as limonite has been developed by RIST and POSCO. This POSCO Nickel Extraction Process (PosNEP) consists of five main processes: ore reduction using hydrogen as a reductant; acid leaching at atmospheric pressure and temperature; …