selective reduction of nickel laterite ores

Selective Reduction Of Nickel Laterite Ores

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 100% minus 65 mesh) high volatile, high ash waste coal and a non-gaseous sulfur material.

Upgrading low nickel content laterite ores using selective ...

In this work, the authors conducted selective reduction of nickel laterite ores at 1100 °C for 60 min with addition of 6% calcium sulfate and 5% reductant coal. The reduced ore …

Selective reduction of an Australian garnieritic laterite ore

Jan 15, 2019 · The actual conditions of selective reduction of nickel and cobalt against iron is complicated by two factors: (1) in the laterite ore, nickel and cobalt oxides form solid solutions with other metal oxides including formation of solid solution of silicates; (2) the reaction products nickel and cobalt also form solid solution or alloy particles with metallic iron distributed in the solid ore particles.

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

Sep 01, 2014 · 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 ...

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.

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 ...

(PDF) Optimal conditions for selective reduction process ...

The selective reduction of nickel and adequate growth of ferronickel grains are imperative for efficient preparation of ferronickel from nickeliferous laterite ore via the process of direct ...

Thermodynamic of selective reduction of laterite ore by ...

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…

Utilization of limonitic nickel laterite to produce ...

The limonitic nickel laterite ore is beneficiated by the selective reduction roasting-magnetic separation process. The mechanism of calcium sulfate and silica in promoting selective reduction of limonitic nickel laterite ore was revealed.

Upgrading low nickel content laterite ores using selective ...

In this work, the authors conducted selective reduction of nickel laterite ores at 1100 °C for 60 min with addition of 6% calcium sulfate and 5% reductant coal.

Mechanism of sodium sulfate in promoting selective ...

(2012) obtained a ferronickel concentrate with a nickel grade of 9.52% and a recovery of 84.04% from high iron grade laterite ore (Ni 1.49%, TFe 34.69%) using selective reduction and magnetic separation process, with the addition of 7% Na 2SO 4 at 1200 °C for 50 min.

Enhanced methods for nickel recovery from low-grade ores ...

Ores with high levels of magnesium are treated by the Caron process: using selective reduction of the ore, and ammonia leaching. This method is more energy intensive, and produces lower metal recovery.

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.

v118n6a5 Carbonylation of nickel and selectively reduced ...

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 temperatures ...

Selective reduction of nickel laterite ores - Allis ...

Apr 01, 1980 · 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.

Thermodynamic Analysis of the Selective Reduction of a ...

Sep 01, 2017 · 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.

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

Mechanism of sodium sulfate in promoting selective ... - CORE

AbstractA high nickel grade ferronickel was produced from laterite ore using the selective reduction-wet magnetic separation process, with the addition of sodium sulfate (Na2SO4). 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 50min with the addition ...

Thermodynamic analysis of selective reduction of ...

Laterite ores especially the saprolitic laterite ore are one refractory nickel resource, the nickel and iron of which can be effectively recovered by direct reduction and magnetic separation.

International Journal of Mineral Processing

Mechanism of sodium sulfate in promoting selective reduction of nickel laterite ore during reduction roasting process Man Jiang a,b, Tichang Sun a,⁎, Zhiguo Liu a, Jue Kou a, Na Liu a, Shiyuan Zhang a a School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China b School of Resources and Environmental Engineering, Shandong ...

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