Method for carbon dioxide suspension dealkalization of red mud for alumina plant
A technology of alumina and red mud, which is applied in cement production, solid waste removal, etc., can solve the problems that restrict the comprehensive utilization of resources, and achieve the effects of simple operation, high dealkalization rate and high alkali purity
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Embodiment 1
[0018] The red mud produced by the sintering method is used as the raw material. The chemical composition and phase composition of the red mud are shown in Table 1.
[0019] Table 1 Chemical composition and phase composition (%) of red mud
[0020] Alumina production method
[0021] First, the red mud was calcined in a muffle furnace at 600° C. for 5 hours, and then crushed and ground through an 80-mesh sieve. Put the pretreated red mud in the dealkalization reactor, add water quantitatively according to the liquid-solid ratio of 10:1, fully stir and mix to form a slurry, and at a temperature of 60°C, pass CO2 at a gas rate of 4m / s 2 The gas-liquid-solid three-phase dealkalization reaction was carried out for 1.5 hours, and the clarified liquid and solid residue were centrifuged. After dealkalization, the dealkalization rate of red mud can reach 85%, and the alkali content in red mud (as Na 2 O meter) is reduced to below 0.3%, fully meets the requirement as the bas...
Embodiment 2
[0023] The red mud produced by the combined method is used as the raw material. The chemical composition and phase composition of the red mud are shown in Table 1.
[0024] Table 2 Chemical composition and phase composition (%) of red mud
[0025] Alumina production method
[0026] First, the red mud was calcined in a muffle furnace at 400° C. for 5 hours, and then crushed and ground through a 150-mesh sieve. Put the pretreated red mud in the dealkalization reactor, add water quantitatively according to the liquid-solid ratio of 5:1, fully stir and mix to form a slurry, and at a temperature of 40°C, pass CO2 at a gas rate of 3m / s 2 The gas-liquid-solid three-phase dealkalization reaction was carried out for 1 hour, and the clarified liquid and solid residue were centrifuged. After dealkalization, the dealkalization rate of red mud can reach 75%, and the alkali content in red mud (as Na 2 O meter) is reduced to below 0.75%, fully meets the requirement as the base ma...
Embodiment 3
[0028] The red mud produced by the Bayer process was used as the raw material. The chemical composition and phase composition of the red mud are shown in Table 1.
[0029] Table 3 Chemical composition and phase composition (%) of red mud
[0030] Alumina production method
[0031] First, the red mud was calcined in a muffle furnace at 700° C. for 3 hours, and then crushed and ground through a 70-mesh sieve. Put the pretreated red mud in the dealkalization reactor, add water quantitatively according to the liquid-solid ratio of 5:1, fully stir and mix to form a slurry, and at a temperature of 40°C, pass CO2 at a gas velocity of 3.5m / s 2 The gas-liquid-solid three-phase dealkalization reaction was carried out for 2 hours, and the clarified liquid and solid residue were centrifuged. After dealkalization, the dealkalization rate of red mud can reach 93%, and the alkali content in red mud (as Na 2 O meter) is reduced to below 0.4%, fully meets the requirement as the bas...
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