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

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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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 in the above method A new process for smelting ferronickel based on the disadvantages of high energy consumption and high energy consumption. In particular, the rotary hearth furnace is applied to process lateritic nickel oxide ore, and finally ferronickel is obtained as a raw material for smelting stainless steel.

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