Iron-making method by performing coal-based direct reduction in rotary hearth furnace and melting in gas melting furnace on lateritic-nickel ore

Abstract

The invention discloses an iron-making method by performing coal-based direct reduction in a rotary hearth furnace and melting in a gas melting furnace on lateritic-nickel ore. The method comprises the following steps: firstly mixing a certain quantity of coal, lateritic-nickel ore and a fluxing agent and then pelletizing, spreading green pellets in a rotary hearth furnace after the pellets are dried, and heating to the temperature of 1200-1300 DEG C and maintaining the temperature for 30-40 minutes to obtain high-temperature metallized pellets; hot-packing the high-temperature metallized pellets at 600-1100 DEG C from the rotary hearth furnace, and then transferring the packed pellets into a heat-accumulating gas melting furnace for melting at the temperature of 1420-1500 DEG C for 30 minutes, wherein the heat-accumulating gas melting furnace utilizes coal gas as fuel; and removing slag to finally obtain high-nickel ferronickel alloy. The iron-making method has the advantages of simple process, short flow, high efficiency, high nickel recovery rate and no need of coking coal and is applicable to the treatment of lateritic-nickel ore.

Description

technical field [0001] The invention relates to a direct reduction ironmaking method of iron and steel smelting technology, in particular to a laterite nickel ore rotary hearth furnace coal-based direct reduction-gas melting furnace melting ironmaking method. Background technique [0002] With the rapid development of the stainless steel industry, the demand for nickel, the raw material for producing stainless steel, is increasing. At present, the sintered blast furnace method has many disadvantages in the laterite nickel ore fire treatment process, such as low blast furnace utilization coefficient, low nickel recovery rate, which can only reach 80%, large coke consumption, and serious sintering pollution; sintered submerged arc furnace The disadvantages of this method are that sintering only acts as agglomerates, and the power consumption of submerged arc furnaces is high; the disadvantages of the rotary kiln pre-reduction, which is adopted by most enterprises--gas melting ...

AI Technical Summary

Problems solved by technology

At present, the sintered blast furnace method has many disadvantages in the laterite nickel ore fire treatment process, such as low blast furnace utilization coefficient, low nickel recovery rate, which can only reach 80%, large coke consumption, and serious sintering pollution; sintered submerged arc furnace The disadvantages of this method are that sintering only acts as agglomerates, and the power consumption of submerged arc furnaces is high; the disadvantages of the rotary kiln pre-reduction, which is adopted by most enterprises--gas melting furnace melting technology, are also obvious, which is manifested in the reduction temperature. High, only 800 ~ 900 ℃, even if the temperature is raised, the energy consumption is high, and it is easy to form rings, so it is forced to stop production and clean up

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