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In laterite nickel processing by direct reduction, the challenges are to conduct selective reduction of nickel and to let iron unreduced. The addition of additive in the direct reduction process is needed to achieve this selective reduction. Additives used for the selective reduction includes Na 2SO 4, MgCl 2, CaSO 4, NaCl and CaCl 2H 2O ...
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In laterite nickel processing by direct reduction, the challenges are to conduct selective reduction of nickel and to let iron unreduced. The addition of additive in the direct reduction process is needed to achieve this selective reduction. Additives used for the selective reduction includes Na 2 SO 4, MgCl 2, CaSO 4, NaCl and CaCl 2 H 2 O ...
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Selective reduction of nickel laterite ores . United States Patent 4195986 . Abstract: 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 100% minus 65 mesh) high volatile, high ash waste coal and a non-gaseous sulfur ...
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Request PDF Selective Reduction of Laterite Nickel Ore Nickel is an important metal in the industry. To obtain nickel metal, the extraction process from nickel ore should be conducted ...
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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 100% 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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2020-4-1 Due to limited reserves of nickel sulphide, which has been dominating the world's nickel production and the increasing of nickel metal demand, further development related to the production of nickel from nickel oxide or lateritic ores should have been a new concern. Selective reduction of saprolitic laterite ore types have been carried out with nickel and iron content in the ore, respectively ...
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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 100% 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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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 ...
Read Morenickel laterite ores these years, accounting for some 60 per cent of total nickel metal production. An effective process of selective reduction roasting-wet magnetic separation was studied to ...
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2012-5-20 Highlights Selective reduction and magnetic separation was conducted on low grade nickel laterite ore. High grade nickeliferous concentrate could be produced from these laterite ores. The addition of calcium sulphate promoted nickel concentration. Nickel was mainly concentrated into a γ Fe–Ni phase in the reduced ore. Calcium sulphate improved the growth of γ Fe–Ni phase.
Read MoreIn 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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Due to limited reserves of nickel sulphide, which has been dominating the world’s nickel production and the increasing of nickel metal demand, further development related to the production of nickel from nickel oxide or lateritic ores should have been a new concern. Selective reduction of saprolitic laterite ore types have been carried out with nickel and iron content in the ore ...
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2020-4-22 Selective reduction of saprolitic laterite ore types have been carried out with nickel and iron content in the ore, respectively 1.71 % and 18.93 %. Research had been done by selective reduction using lignite and sub-bituminous coal as reductant at temperatures of 900 °C, 1000 °C, and 1100 °C with the addition of sulfur and sodium hydroxide ...
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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.
Read MoreA series of selective reduction processes were carried out into the pellet ores at various temperatures of 950-1150 C for 60-120 minutes. The optimal selective reduction parameters of nickel laterite ore were observed clearly. The experimental results indicated that the reduction reactions proceed more completely at a higher temperature and ...
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2019-5-9 extraction of nickel from laterite ore by selective reduction followed by carbonylation. 1.+!1,/0' Carbonylation of pure nickel and nickel in selectively reduced laterite ore was studied at temperatures of 80-100°C and CO gauge pressures of 0-56 atm. Nickel was produced by reduction of NiO by hydrogen at 500°C. Laterite ore was selectively ...
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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. The mixed ore was pelletized into 10-15 mm of diameter.
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【DOI】 10.1016/j.minpro.2012.01.003 【摘要】 The processing of nickel laterite ore to produce ferronickel is energy intensive, especially when low nickel content ores are processed. The selective reduction–beneficiation of laterite ore to produc...
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We claim: 1. A process for the selective reduction of nickel and magnesia-containing laterite ores which comprises: contacting said ore with a reducing gas consisting essentially of carbon monoxide at a temperature in the range of 300° to 450° C for a time sufficient to reduce substantially all of the nickel contained in the ore to the elemental state, said contacting being performed in the ...
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2016-11-4 Limonite, Saprolite, Nickel, Thermodynamics, Reduction 1. Introduction Metallic nickel is primarily obtained from two ore types: nickel sulphide and nickeli-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
Read More2015-7-23 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.
Read MoreNickeliferous 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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2015-9-21 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 ...
Read MoreDue to limited reserves of nickel sulphide, which has been dominating the world’s nickel production and the increasing of nickel metal demand, further development related to the production of nickel from nickel oxide or lateritic ores should have been a new concern. Selective reduction of saprolitic laterite ore types have been carried out with nickel and iron content in the ore ...
Read More2019-5-9 extraction of nickel from laterite ore by selective reduction followed by carbonylation. 1.+!1,/0' Carbonylation of pure nickel and nickel in selectively reduced laterite ore was studied at temperatures of 80-100°C and CO gauge pressures of 0-56 atm. Nickel was produced by reduction of NiO by hydrogen at 500°C. Laterite ore was selectively ...
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Corpus ID: 139473766. Study on selective reduction and magnetic separation of low-grade nickel laterite ore to produce high nickel concentrate @inproceedings{Li2010StudyOS, title={Study on selective reduction and magnetic separation of low-grade nickel laterite ore to produce high nickel concentrate}, author={Q. Li and Yu.
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2020-6-11 However, miners of nickel sulfide ores are now confronted with increasing challenges due to much deeper drilling requirements, higher production costs and depleting reserves. Moreover, only 30% of the land nickel reserves now exist as sulfide ores with the balance comprised of nickel laterite ores ( Agatzini-Leonardou et al., 2009, Mudd, 2009 ).
Read More【DOI】 10.1016/j.minpro.2012.01.003 【摘要】 The processing of nickel laterite ore to produce ferronickel is energy intensive, especially when low nickel content ores are processed. The selective reduction–beneficiation of laterite ore to produc...
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Carbothermic Selective Reduction of Laterite Nickel Ore by Addition of Sulfur and Sodium Hydroxide to Produce Ferronickel. Proceedings of the 3rd International Seminar on Metallurgy and Materials, AIP Conf. Proc. 2232, 060006-1 – 060006-9.
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2016-11-4 Limonite, Saprolite, Nickel, Thermodynamics, Reduction 1. Introduction Metallic nickel is primarily obtained from two ore types: nickel sulphide and nickeli-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
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