A kind of method of utilizing laterite nickel ore to produce nickel-containing molten iron

Abstract

The invention provides a method for producing nickel-contained molten iron by using a laterite nickel ore. The method comprises the following steps: the laterite nickel ore is sintered, and is smelted in a blast furnace to obtain the nickel-contained molten iron; the binary alkalinity of the sintered ore is 0.5-1; and by 100% of the total weight of the blast furnace smelting slag system, the blast furnace smelting slag system contains 20-35 wt% of CaO, 35-50 wt% of SiO2, 14-25 wt% of MgO, and 2-20 wt% of Al2O3. The method for producing the nickel-contained molten iron by using the laterite nickel ore can reduce the smelting slag quantity and the coke ratio, decreases the energy consumption, improves the fluidity of the blast furnace smelting slag system, and reduces the smelting difficulty and cost.

Description

technical field [0001] The invention relates to a method for producing molten iron containing nickel by using laterite nickel ore, in particular to a method for producing molten iron containing nickel by using laterite nickel ore by adopting a "sintering-blast furnace method", which belongs to the field of metallurgy and mining technology. Background technique [0002] About 70wt% of nickel is currently used in stainless steel production globally. There are two main types of nickel ore resources in the world, one is nickel sulfide ore, and the other is laterite nickel ore. Nickel sulfide ore resources are increasingly depleted. Laterite nickel ore is the main source of nickel resources in the future, and laterite nickel ore contains some chromium, which is also the main element used in the production of stainless steel. [0003] The process of using "sintering-blast furnace method" to smelt laterite nickel ore to produce nickel-containing molten iron has the characteristics...

AI Technical Summary

Problems solved by technology

The first two methods of use can make a certain profit when the price of iron ore powder is high, but they obviously lose their competitive advantage when the price of high-quality iron ore drops sharply today, which also leads to the abandonment and stockpiling of a large amount of surface laterite ore in the mine

Although the third method can produce 10-15wt% nickel-containing molten iron when dealing with serpentine-type lateritic nickel ore, the high MgO and high SiO in the slag system are generally ignored when the blast furnace is used to produce nickel-containing molten iron. 2 Due to the characteristics of the slag system, the structure of the slag system was not adjusted, resulting in too high melting temperature of the slag system, which further led to excessive slag volume in the smelting process, high coke ratio, poor fluidity of molten iron and slag, and very difficult operation of the blast furnace. Finally, it had to be added Fluorite is used to increase fluidity, but adding fluorite will erode the refractory material in the furnace and reduce the service life of the blast furnace