Method for Smelting Laterite Nickel Ore in Blast Furnace for Reducing Magnesium Oxide Content in Slag

Abstract

The invention discloses a method for smelting laterite nickel ore in a blast furnace which can reduce the content of magnesia in slag. The method is to sieve the raw laterite nickel ore with a 25mm sieve first, and then crush and sieve the oversize material with a 25mm sieve. The sintered ore is sent to the blast furnace for smelting; in the blast furnace slag removal process, the steelmaking converter refining reduced slag is sprayed into the blast furnace slag for secondary slagging, and the injection amount of the steelmaking converter refining reducing slag is less than 1% of the mass of the blast furnace slag / 12. The invention effectively reduces the MgO content of the blast furnace slag from the original 16-20% to below 10%, can reduce the content of Cr2O3 and FeO, improves the desulfurization effect of the blast furnace, saves lime for steelmaking production, and reduces the production cost of the metallurgical process , to ensure the quality of molten steel, and at the same time, the blast furnace slag can be used in a large amount in the cement industry, with remarkable economic and social benefits.

Description

technical field [0001] The invention belongs to the field of smelting stainless steel with laterite nickel ore, and in particular relates to a method for smelting laterite nickel ore in a blast furnace for reducing the content of magnesium oxide in slag. Background technique [0002] With the rapid development of my country's economy, the demand for stainless steel, which accounts for 65% of nickel use, continues to grow. Due to the lack of nickel resources in my country, domestic iron and steel enterprises import a large amount of low-grade laterite nickel ore from abroad to smelt ferronickel for stainless steel production. The blast furnace smelting of laterite nickel ore is composed of crushing, sintering and smelting of raw materials. Since the composition and physical characteristics of laterite ore are different from ordinary iron ore, the sintering and blast furnace smelting ingredients of laterite ore have their own characteristics, mainly in Sinter basicity, blast ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to reduce the magnesium oxide content of the slag in blast furnace smelting laterite nickel ore, so as to avoid problems such as unstable furnace conditions, serious metal loss, and high production costs caused by high magnesium oxide content, and improve the use of blast furnace slag in the cement industry. reduce the environmental pressure caused by blast furnace slag

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