Smelting technique for processing nickel ore by rotary kiln

Abstract

The invention relates to a smelting technology of nickel ore, in particular to a smelting technology for processing the nickel ore in a rotary kiln. The technology comprises the following steps: the nickel ore is prepared, mixed and stirred with lime; the mixture obtained is sieved, powder blocks enter a material bin of the rotary kiln, and ore blocks are crushed into powder blocks and put into the material bin of the rotary kiln; cokes are crushed and put into the material bin of the rotary kiln; the powder blocks and coke powder are transmitted; then the powder blocks and the coke powder are put into a first-class mixing drum to carry out material mixing; after the first-class material mixing, the second-class material mixing is carried out in a second mixing drum and simultaneously, water is added for moistening; the material after material mixing is transmitted into the rotary kiln; simultaneously, thermal gas is fed in to carry out reduction and roasting in the rotary kiln; and the obtained thermal calcine enters a heat furnace for smelting. The smelting technology reduces water content of the nickel ore, and decomposes carbonate in the nickel ore; further, mineral powder of fine grains grows into nickel clinker of bigger grains, thereby improving the property of electric furnace smelting, improving economic benefits of a company and having great promotion and application values.

Description

technical field [0001] The invention relates to a nickel ore smelting process. Background technique [0002] At present, the smelting of nickel ore adopts the direct smelting of primary nickel ore. Since the water content in primary nickel ore is as high as 30%, this brings great disadvantages to normal smelting, mainly reflected in the following aspects: [0003] 1. Nickel ore with a water content of more than 20% has a certain viscosity, which brings great difficulty to feeding. [0004] 2. High-moisture nickel ore is used for smelting in the furnace. Due to the evaporation of water, water vapor condenses in the material layer in the furnace. When the pressure exceeds a certain level, it will cause serious material spraying to release its own energy. The phenomenon of material spraying causes two adverse consequences. One is that it is easy to cause safety problems such as burns, and the other is that the material loss is large and the recovery rate of materials is reduce...

AI Technical Summary

Problems solved by technology

The phenomenon of material spraying causes two adverse consequences. One is that it is easy to cause safety problems such as burns, and the other is that the loss of materials is large and the recovery rate of materials is reduced.

[0005] 3. Using high-moisture nickel ore for smelting, high energy consumption and low output

[0007] 5. The use of high-moisture nickel ore for smelting in the furnace results in high moisture content in the flue gas, which brings greater difficulty to the normal operation of the bag dust collector, because the flue gas with high humidity can easily cause the bag to be bonded by dust. Greatly reduces the dust removal effect

[0008] Because primary nickel ore is smelted directly into the furnace, it brings many disadvantages and also affects the economic benefits of the enterprise, so it is urgent to roast primary nickel ore

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