selective reduction of nickel laterite ores

selective reduction of nickel laterite ores

Selective reduction of nickel laterite ores - Allis ...

There are also several prior patents which suggest that selective reduction of a bed of nickel laterite ore be accomplished by passing over the bed gases obtained from the heating of high sulfur low grade coal. Althouth it is known that sulfur should be present during selective reduction, the role that it

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Selective Reduction of Laterite Nickel Ore

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. This article will further review the role of additive used in selective reduction of laterite nickel ore

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Selective Reduction of Laterite Nickel Ore

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. This article will further review the role of additive used in selective reduction of laterite nickel ore and the current trends on selective reduction ...

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Selective reduction of nickel laterite ores

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US4195986A - Selective reduction of nickel laterite

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...

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Carbothermic selective reduction of laterite nickel ore

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

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Upgrading low nickel content laterite ores using

2012-5-20  Selective reduction and magnetic separation of laterite ore. According to previous research, nickeliferous concentrates with nickel content of 5.1% and a nickel recovery of 98.8% could be produced from LN laterite ore by selective reduction and magnetic separation process when the reduction was conducted at 1250 °C for 60 min (Li et al., 2010). During the calcination, reduction of wustite was

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Selective Reduction of Laterite Nickel Ore

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 2 SO 4

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Research on Selective Reduction of Laterite Nickel Ore

When laterite nickel ore was reduced by mixed gas with a CO 2 /H 2 ratio of 9/1 and a gas flow of 100mL/min at 800°C for 1h, a product with a Ni metallization rate over 95% and a Ni/Fe ratio as much as 2.6 was prepared.

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Thermodynamic of selective reduction of laterite ore

2015-9-1  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 of the selective reduction of laterite ore [7]. And the metal Fe in the reduction production of laterite ore tends to combine with metal Ni, which is the reduction production of NiO in laterite ore,

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US Patent for 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 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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Research on Selective Reduction of Laterite Nickel Ore

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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Thermodynamic Analysis of the Selective Reduction of

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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Optimal conditions for selective reduction process of ...

A 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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Reduction of laterite ores - The United States of

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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Thermodynamic analysis of selective reduction of ...

2015-7-23  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.

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v118n6a5 Carbonylation of nickel and selectively reduced ...

2018-7-10  reduction of NiO and nickel from selectively reduced laterite ore. The aim is to examine the feasibility of the alternative technology for the 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

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Phase transformation of nickel laterite ores in the ...

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

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Direct Reduction of Limonitic Laterite Nickel Ore with ...

The increasing demand for stainless steel and the scarcity of sulfide nickel ore affect the increase of laterite nickel ore processing. One of the processes that has been proven can be applied to process laterite nickel ore is direct reduction. In the direct reduction, the reduction atmosphere was adjusted by controlling the volume of CO and CO2 from carbon source materials, such as coal ...

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Thermodynamics of the Reduction Roasting of

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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Carbothermic selective reduction of laterite nickel ore

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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Optimal conditions for selective reduction process of ...

A 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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Upgrading low nickel content laterite ores using selective ...

【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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Thermodynamic of selective reduction of laterite ore by ...

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 ...

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Thermodynamic analysis of selective reduction of ...

2015-7-23  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 More
Reduction of laterite ores - The United States of

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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Utilization of nickel slag using selective reduction ...

2013-12-3  Key words: nickel slag; selective reduction; magnetic separation 1 Introduction Nickel can be produced from laterite ores by reduction−smelting process [1] or from sulfide ores by roasting−smelting process [2], and both of these processes generate slags, which will not only take up a lot of land, bring pollution to the environment, but will

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Phase transformation of nickel laterite ores in the ...

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.X-ray diffraction (XRD),scanning electron microscopy(SEM) and energy ...

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Phase transformation of nickel laterite ores in the ...

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

Read More
Direct Reduction of Limonitic Laterite Nickel Ore with ...

The increasing demand for stainless steel and the scarcity of sulfide nickel ore affect the increase of laterite nickel ore processing. One of the processes that has been proven can be applied to process laterite nickel ore is direct reduction. In the direct reduction, the reduction atmosphere was adjusted by controlling the volume of CO and CO2 from carbon source materials, such as coal ...

Read More