Method for smelting nickel-iron alloy from laterite nickel oxide ore

A technology of nickel oxide ore and nickel-iron alloy, which is applied in the field of nickel-iron alloy smelting, can solve the problems of high energy consumption and large amount of slag, and achieve the effect of energy saving

Active Publication Date: 2009-07-15
SHOUGANG CORPORATION
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for smelting ferronickel from laterite nickel oxide ore, so that the iron oxide and nickel oxide in the laterite nickel oxide ore are effectively reduced in the reduction section of the rotary hearth furnace, so as to overcome the large amount of slag

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  • Method for smelting nickel-iron alloy from laterite nickel oxide ore

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Embodiment

[0023] Mix 80% by weight of lateritic nickel oxide ore powder, 5% by weight of coal powder, and 15% by weight of flux to uniformly press the ball. Most of the pellets obtained after reduction, melting and cooling are slag phase, while the granular nickel-iron alloy is embedded in the slag, and its particle size is about 0.5mm~5mm. After water quenching and crushing, magnetic separation, Most of the slag phase is removed, and the obtained magnetic substance is a coarse nickel-iron alloy containing a small amount of slag. Since the ferronickel content in the lateritic nickel oxide ore is only 10% in total and the ratio of metal to slag is low, the liquid ferronickel contained in the slag bears high pressure, and their dispersion degree in the slag is also large, so mutual aggregation is achieved. The distance of diffusion is long, and the chance of collision and contact with each other is small, so smaller granular nickel-iron is often formed according to the principle of proxim...

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Abstract

A method for smelting ferronickel alloy from laterite nickel oxide ore belongs to the ferronickel alloy smelting technical field. A direct reduction technique of carbon-bearing pellets in a rotary hearth furnace is adopted to reduce the nickel oxide in nickel ores to iron and nickel; then iron and nickel are smelted; the solid solutions of nickel and iron are agglomerated, cooled, shattered and subjected to magnetic selection, so that the granular ferronickel alloy with high sulfur content is obtained; and the ferronickel alloy is melted and desulphurized, so that the purified ferronickel alloy is obtained. The invention has the advantages that compared with the traditional process without separation in advance, the follow-up smelting process of the method can save a great amount of energy source for the greatly reduced quantity of slag; and the crude ferronickel obtained through smelting contains relatively low Si content.

Description

technical field [0001] The invention relates to the technical field of nickel-iron alloy smelting, and in particular provides a method for smelting nickel-iron alloy from laterite nickel oxide ore. The comprehensive extraction of nickel and iron from laterite nickel oxide ore is carried out by pyrometallurgy, especially involving the use of rotary hearth furnaces, using composite carbon-containing pellets made of laterite nickel oxide ore, flux and coal powder as raw materials, and subjected to high temperature Reduction and melting, the liquid ferronickel is aggregated into small particles in the viscous slag, then quenched and crushed, and the crude nickel-iron alloy with high sulfur content is obtained after magnetic separation, and then melted and refined in an electric furnace or an induction melting furnace for desulfurization. Cast into alloy ingots as raw materials for smelting stainless steel. Background technique [0002] Lateritic nickel oxide ore has not been wi...

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Application Information

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IPC IPC(8): C22B1/14C22B23/00C21B11/00B03C1/02
CPCY02P10/20
Inventor 徐萌赵志星
Owner SHOUGANG CORPORATION
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