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selective reduction of nickel laterite ores

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Carbonylation of Nickel and Iron from Reduced Oxides and ...

The PhD project was undertaken within the ARC (Australian Research Council) Discovery Grant (Project No. DP1094880) which examined a novel approach to processing of laterite ores based on the selective reduction of the ore and extraction of nickel by carbonylation of the selectively reduced ore. Selective reduction of the laterite ore was ...

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Mechanism of sodium sulfate in promoting selective ...

A high nickel grade ferronickel was produced from laterite ore using the selective reduction-wet magnetic separation process, with the addition of sodium sulfate (Na 2 SO 4).The ferronickel concentrate assaying 9.87% Ni, with a nickel recovery of 90.90% can be obtained, when laterite ore was reduced at 1200 °C for 50 min with the addition of 10 wt.% Na 2 SO 4 and 2 wt.% coal.

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US4195986A - Selective reduction of nickel laterite ores ...

To prepare nickel laterite ore for selective reduction of its nonferrous metal oxides, it is comminuted (preferably to 85% minus 200 mesh) and is mixed with comminuted (preferably minus 65 mesh) high volatile, high ash waste coal and a non-gaseous sulfur material. Carbon content of the coal is 50% to 150% of the amount of carbon needed for stoichiometric complete reduction of nonferrous ...

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Research on Selective Reduction of Laterite Nickel Ore by ...

In this paper, thermodynamic analysis on reduction of lateritic nickel ore by CO2/H2 mixed gas was performed based on activity theory. Effects of CO2/H2 ratio and temperature on selective reduction of laterite ore were investigated. The calculation result shows that the metallization of Fe and Ni could be promoted by each other because of the variation of the Fe and Ni activity, which accounts ...

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Factors Affecting the Upgrading of a Nickeliferous ...

Zevgolis et al. [13] reviewed the physicochemical properties of the reduction roasting of Greek laterite ores. The researchers concluded that the reduction degrees of the iron and nickel oxides in Greek laterites between 700 to 900 C could not exceed 33% and 76%, respectively, even though adequate amounts of carbon remained in the calcine.

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(PDF) Mechanism of sodium sulfate in promoting selective ...

A high nickel grade ferronickel was produced from laterite ore using the selective reduction-wet magnetic separation process, with the addition of sodium sulfate (Na2SO4).

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Separation of iron-nickel alloy nugget from limonitic ...

nickel from the nickel laterite ores. The widely used method of concentrating the nickel content of these laterite ores is the selective reduction of the contained metal oxides at moderate temperature to form a metallic phase, which may then be separated from the gangue by .

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Thermodynamic of selective reduction of laterite ore by ...

the nickel oxides in the ore are reduced to metallic state, while the reduction of iron oxides is minimized. Selective reduction of laterite ore, as explained before, plays an important role in the treatment process of laterite ore [3−6]. Reduction temperature and gas composition are two main factors which significantly affect the efficiency ...

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Selective Reduction of High Alumina-Lateritic Nickel Ore ...

Selective Reduction of High Alumina-Lateritic Nickel Ore (0.5 Ni-44Fe-16Al2O3) In this present study, the effect of reductant dosage, temperature and holding time on selective reduction process of high alumina-lateritic nickel ore have been investigated clearly.

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Recovery of Nickel from Selectively Reduced Laterite Ore ...

the Indonesian high-grade Fe laterite ore as an iron re-source.12) Figure 1shows the flow diagram of laterite pro-cessing. The purpose of the process is to separate the impu-rities of laterite ore by a combination process of selective reduction, leaching and magnetic separation. The selective reduction of the laterite ore by CO/CO 2 (30/70vol ...

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Thermodynamic Analysis of the Selective Reduction of a ...

Nickeliferous limonitic laterite ores are becoming increasingly attractive as a source of metallic nickel as the costs associated with recovering nickel from the sulphide ores increase. Unlike the sulphide ores, however, the laterite ores are not amenable to concentration by conventional mineral processing techniques such as froth flotation.

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How nickel ore is separated - beckers-muehle.de

Preparation Of Ferronickel From Nickel Laterite Via Coal. Jul 11 2018Preparation of ferronickel from nickel laterite via coalbased reduction followed by magnetic separation J Kou N Liu and SY Zhang Mechanism of sodium sulfate in promoting selective reduction of nickel laterite ore during reduction roasting process Int J Miner Process 1232013 p 32 CrossRef Google Scholar

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Recovery of Nickel from Selectively Reduced Laterite Ore ...

In the sulphuric acid leaching of metallic nickel from roast-reduced lateritic ore, leaching rate of nickel is also found chemically controlled by reactions on the solid surface ( Purwanto et al ...

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DIRECT REDUCTION OF NICKEL LATERITE LIMONITIC ORE USING .

the results obtained with those of studying the selective reduction of the laterite nickel ore by a carbothermic reduction process, the so-called selectivity equation is used. It is connected with the evaluation of the selectiv - ity factor by Eq. 8: (8) where X and Y are the grades of Ni and Fe in the unreduced and the reduced ore, respectively.

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Optimal conditions for selective reduction process of ...

A low-grade nickel laterite ore from Indonesia was selected to investigate the effect of temperature and time of reduction upon the extraction of nickel through the selective reduction-magnetic separation process to produce the ferronickel. The nickel ore was mixed with5 wt.% of anthracite coal and 10 wt.% of sodium sulfate additive.

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Thermodynamics of the Reduction Roasting of Nickeliferous ...

ferous laterite (oxide) ores. Global nickel resources averaging a minimum nickel grade of about 1% contain about 130 million tons of nickel, and the distribution between the nickel sulphides and nickel laterites is estimated to be approximately 40% and 60%, re-spectively [1]. Nickeliferous laterite ores may be divided into two types: limonite and

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Thermodynamic Analysis of the Selective Reduction of a ...

Nickeliferous limonitic laterite ores are becoming increasingly attractive as a source of metallic nickel as the costs associated with recovering nickel from the sulphide ores increase. Unlike the sulphide ores, however, the laterite ores are not amenable to concentration by conventional mineral processing techniques such as froth flotation.

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Thermodynamic analysis of selective reduction of ...

Mar 22, 2016 · The nickel sulphide ore deposits are becoming more expensive to mine, and increasing attention is being paid to the recovery of the nickel from the nickeliferous laterite ore deposits. In contrast to the sulphide ores, these oxide ores cannot be beneficiated by flotation or other conventional mineral processing techniques. One potential concentrating method would be the solid state ...

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Reducibility of Low Nickel Lateritic ores with Presence of ...

different types of reductor and various nickel ores. But only a few are using low grade nickel lateritic and microstructure investigate areas of reduction nickel lateritic which has the highest levels of metallization and growth the metal particle with selective reduction using any type coal.

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THE SELECTIVE SULPHIDATION AND PHYSICAL UPGRADING .

The processing of nickeliferous laterites to produce nickel metal is both complex and energy intensive. Since most laterites are found in remote regions, the capital costs for the infrastructure can exceed those for the process itself. The low temperature sulphidation of lateritic ores to produce an intermediate nickel

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Phase transformation of nickel laterite ores in the ...

Abstract. Since it is difficult to extract nickel from laterite ores with low nickel grade by traditional beneficiating methods, the microstructure and phase transformation of a nickel laterite ore with the nickel grade of 1.49% were investigated by using a selective reduction roasting method at different roasting temperatures and time.

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