Pyrolysis and reduction reaction system and method for recycling type laterite-nickel ore wet pellets in flue gas waste heat furnace body
A technology of laterite nickel ore and waste heat of flue gas, which is applied in the field of chemical industry and metallurgy, can solve the problems that oil and gas resources cannot be realized, and recovery of reduced coal has not been considered, so as to reduce energy consumption, reduce process energy consumption and cost, and increase by-products.
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Embodiment 1
[0060] The lateritic nickel ore (containing Ni 1.85%), bituminous coal (25% volatile matter) and sodium carbonate are batched and mixed in the batching device at a mass ratio of 100:10:5 to obtain a mixed material, and the mixed material is formed Wet pellets (water content 14.6%) are obtained by forming in the device, and then the wet pellets are pyrolyzed and reduced in a rotary hearth furnace with pyrolysis and reduction functions, and the pyrolysis zone and low-temperature reduction zone of the rotary hearth furnace are heated The heat of the tube comes from the heat exchange of the high-temperature dedusting flue gas of the rotary hearth furnace. The included angle of the ring in the dry pyrolysis zone is 60º, the temperature in the dry pyrolysis zone is 900°C, and the residence time is 10min; The temperature is 1100°C, and the residence time is 10 minutes; the included angle of the ring in the high-temperature reduction zone is 180º, and the temperature in the high-temper...
Embodiment 2
[0062] Three kinds of raw materials below 100 mesh: laterite nickel ore (containing Ni 2.45%), lignite (40% volatile matter) and limestone are batched and mixed in the batching and batching device at a mass ratio of 100:20:15 to obtain a mixture The mixed material is molded in a molding device to obtain wet pellets (water content 18.6%), and then the wet pellets are pyrolyzed and reduced in a rotary hearth furnace with pyrolysis and reduction functions. The heat of the heating tubes in the decomposition zone and the low-temperature reduction zone comes from the heat exchange of the high-temperature dedusting flue gas of the rotary hearth furnace. The included angle is 110º, the temperature in the low-temperature reduction zone is 1150°C, and the residence time is 20 minutes; the included angle of the ring in the high-temperature reduction zone is 140º, the temperature in the high-temperature reduction zone is 1400°C, and the residence time is 10 minutes. The pyrolysis oil and ...
Embodiment 3
[0064] The laterite nickel ore (containing Ni 1.12%), sub-bituminous coal (35% volatile matter) and lime are mixed and mixed in the batching device according to the mass ratio of 100:30:9 to obtain the mixed material, and the mixed material is molded Wet pellets (water content 25%) are obtained by forming in the device, and then the wet pellets are pyrolyzed and reduced in a rotary hearth furnace with pyrolysis and reduction functions, and the pyrolysis zone and low-temperature reduction zone of the rotary hearth furnace are heated The heat of the tube comes from the heat exchange of the high-temperature dedusting flue gas of the rotary hearth furnace. The included angle of the ring in the dry pyrolysis zone is 150º, the temperature in the dry pyrolysis zone is 750°C, and the residence time is 30 minutes; The temperature is 1000°C, and the residence time is 10 minutes; the included angle of the ring in the high-temperature reduction zone is 120º, and the temperature in the high...
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