Nickel Ore Reduction by Hydrogen and Carbon Monoxide Containing Gases

Antola, Olli; Holappa, Lauri; Paschen, Peter

doi:10.1080/08827509508914195

Cited by 28 publications

(14 citation statements)

References 5 publications

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“…In fact, limonitic laterite ore consists of various components such as NiO, Fe 2 O 3 , Fe 3 O 4 , etc. Therefore, other reactions simultaneously take place in reduction process [15].…”

Section: Thermodynamic Basismentioning

confidence: 99%

Separation of iron-nickel alloy nugget from limonitic laterite ore using self-reduction

Ju¹,

Ryom²,

Hong³

2018

J min metall B Metall

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To efficiently extract nickel from low grade limonitic laterite ore, a separation method of iron-nickel alloy nugget by selfreduction of coal composite limonitic laterite ore briquette was investigated. In this investigation, in order to decrease the separation temperature of iron-nickel alloy nugget, the selective reduction by control of C/O ratio was introduced and reductant added in the briquette was inadequate for the reduction of nickel and iron. Nickel was preferentially reduced in the reduction process, while iron was partially reduced due to the lack of reductant. After reduction, a certain amount of FeO existed in the reduced product. This residual FeO had a great role in the formation of low melting point slag, which could promote the formation and the separation of iron-nickel alloy nugget at relatively low temperature. In this investigation, the reduction experiments were all conducted at 1300°C. To evaluate the formation and the separation of iron-nickel alloy nugget in the reduction process, we observed the patterns of reduced products under different C/O ratio, CaO addition ratio and holding time conditions. And then the effect of C/O ratio and CaO addition ratio on nickel content of nugget and nickel recovery ratio were investigated. The results showed that 0.7 of C/O ratio, 8% of CaO addition ratio and 40min of holding time were suitable for the separation of iron-nickel alloy nugget from limonitic laterite ore. Nickel and iron content of the nugget and the nickel recovery ratio were 4.75%, 89.51% and 85%, respectively. Nuggets were easily separated from slag by crushing and screening. This separation method could be applied to any limonitic laterite ore by adjusting C/O ratio and CaO addition ratio.

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“…In fact, limonitic laterite ore consists of various components such as NiO, Fe 2 O 3 , Fe 3 O 4 , etc. Therefore, other reactions simultaneously take place in reduction process [15].…”

Section: Thermodynamic Basismentioning

confidence: 99%

Separation of iron-nickel alloy nugget from limonitic laterite ore using self-reduction

Ju¹,

Ryom²,

Hong³

2018

J min metall B Metall

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“…6 Although coal is industrially the most commonly used reductant, most studies have focused on the gaseous reduction of laterites. 9,[12][13][14][15] In the current study, the mineralogy of Sivrihisar limonitic ore as well as its reduction behaviour has been investigated. Reduction experiments were carried out under an inert atmosphere using coal as a reductant.…”

Section: Introductionmentioning

confidence: 99%

Reducibility of nickeliferous limonitic laterite ore from Central Anatolia

Pournaderi

Keskinkilic

Geveci

et al. 2013

Canadian Metallurgical Quarterly

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Limonitic nickel laterite from Sivrihisar reserve in Turkey was reduced at 700-1100uC by the addition of 5?74, 8?61 and 11?48 wt-% coal under an argon atmosphere. The run-of-mine ore and the reduced samples were studied using X-ray diffraction. The metallisation of Fe was found to be limited up to 900uC, but increased rapidly at higher temperatures. The metallisation of Ni and Co increased when the temperature was increased from 700 to 800uC, almost levelled off up to 900uC and then increased up to 1100uC. The results also showed that increased coal additions did not affect Fe metallisation up to 900uC. At 1000uC the metallisation of Fe became slightly better, but its effect was more pronounced at 1100uC. The increased coal addition affected the nickel reduction equally at all temperatures, while it had no effect on the metallisation of Co.

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“…The reduction rate of the laterite ore increased as the reduction temperature increased. Olli et al 14) studied the reduction of nickel ore under gases with various H 2 and CO contents. The results showed that pure nickel could not be obtained via selective reduction; however, ferronickel was obtained.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Nickel and Iron from Low-Grade Nickel Laterite Ore via a Solid-State Deoxidization Method Using Methane

Zhang

Wei

et al. 2018

Mater. Trans.

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This work focuses on the solid-state deoxidization of low-grade nickel laterite ore under various conditions using methane. The effects of the reduction temperature, reduction time, and methane concentration on the metallization rates of nickel and iron were investigated. The nickel metallization rate increased as the temperature increased to 600°C; it then decreased as the temperature was further increased. The iron metallization rate increased gradually as the temperature increased. The nickel metallization rate sharply increased to over 90% when the CH 4 concentration was increased to 20 vol%. The reduction time, which ranged from 3090 min, had a negligible effect on the reduction of nickel and iron. In the case of the reduced product, the nickel and iron metallization rates were 91.17% and 23.67%, respectively. The optimal conditions were determined to be a reduction temperature of 700°C, a reaction time of 60 min, and a CH 4 concentration of 20 vol%. The nickel oxide was almost completely reduced to metallic nickel, and the majority of the iron was reduced to low-valence iron oxide. During the reduction process, a magnesium olivine phase (Mg 2 SiO 4) was produced by the recrystallization of amorphous silicate in the reduction process, and hindered the reduction of nickel and iron.

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Nickel Ore Reduction by Hydrogen and Carbon Monoxide Containing Gases

Cited by 28 publications

References 5 publications

Separation of iron-nickel alloy nugget from limonitic laterite ore using self-reduction

Separation of iron-nickel alloy nugget from limonitic laterite ore using self-reduction

Reducibility of nickeliferous limonitic laterite ore from Central Anatolia

Reduction of Nickel and Iron from Low-Grade Nickel Laterite Ore via a Solid-State Deoxidization Method Using Methane

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