Ferronickel smelting process of nickel oxide ore free of crystal water in blast furnace

Abstract

The invention provides a smelting ferro nickel technique with nickel oxide without crystal water by blast furnace, which comprises mainly: breaking and sieving the material, sintering the mineral powder, and matching and mixing the sintered block, coke, 4~35% lime/calcium lime to provide basicity and balance the additive, 0~8% dolomite with magnesium to overcome poor iron fluid property, and 0.3~8% fluorite. Compared with existing technique, this invention can reduce the effect to furnace temperature from chrome, avoids accidents from high fluorin content, and has high yield radio.

Description

Technical field: [0001] The invention relates to a blast furnace smelting process, in particular to a blast furnace smelting nickel-iron ore without crystal water. Background technique: [0002] With the wide application of stainless steel and special steel around the world, the most important element for smelting stainless steel and special steel - nickel metal is in short supply, causing the price to soar. Traditional nickel metal production is mainly extracted from nickel sulfide ore, which accounts for 30% of the earth's nickel resources, and its production process is mature. However, after nearly a hundred years of continuous mining, the current reserves are insufficient and the resources are in crisis. Force people to pay more attention to extracting nickel metal from laterite nickel ore (nickel oxide ore), which accounts for 70% of the earth's nickel resources. The main reason why laterite nickel ore has not been developed on a large scale for a long time is that th...

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Problems solved by technology

The one-time investment of this process equipment is large, the process is complicated, the cycle is long, and the environmental pollution is serious

The use of blast furnace smelting is undoubtedly a more economical choice, but since laterite nickel ore is often associated with Cr 2 o 3 composition, and the melting point of chromium is very high, which makes the molten iron viscosity high after melting, and the molten iron containing nickel and chromium cannot flow out smoothly, resulting in serious consequences of freezing and destroying the furnace

Many enterprises and research institutes at home and abroad have conducted research on the process of smelting laterite nickel ore into ferronickel (ferronickel) by one-step blast furnace for a long time, but there has been no successful report so far.

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