a use of co 2 Method for dealing with bayer process red mud dealkalization in combination with waste acid
A Bayer process red mud and combined treatment technology is applied in the treatment field of Bayer process red mud dealkalization, which can solve the problems of low absorption rate and long time, and achieve the effect of great economic value.
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example 1
[0019] The first step is to crush the red mud. After grinding, the particle size of the red mud is 160 mesh, and mix it with water. The weight ratio of Bayer red mud to water is 1:10; CO2 is introduced into the Bayer red mud 2 Carry out acidification reaction to obtain solid-liquid mixture (1); Pass into CO 2 The flow rate is 1L / min, the reaction temperature is 80°C, and the time is 0.5h; the second step is to add waste hydrochloric acid with a mass concentration of 20% to the solid-liquid mixture (1) obtained in the first step of acidification reaction, Bayer method The mass ratio of red mud to the added waste hydrochloric acid is 4:1, the reaction temperature is 80°C, and the time is 2 hours to obtain a solid-liquid mixture (2); in the third step, the solid-liquid mixture (2) obtained after the second step is pumped Separation by filtration and separation of treated residues for recovery of aluminum and iron. The alkali content in the low-alkali red mud was detected by conv...
example 2
[0021] The first step is to crush the red mud. After grinding, the particle size of the red mud is 160 mesh, and mix it with water. The weight ratio of Bayer red mud to water is 1:9; CO2 is introduced into the Bayer red mud 2 Carry out acidification reaction to obtain solid-liquid mixture (1); Pass into CO 2 The flow rate is 1L / min, the reaction temperature is 60°C, and the time is 1h; the second step is to add waste hydrochloric acid with a mass concentration of 20% to the solid-liquid mixture (1) obtained in the first step of acidification reaction, and the Bayer process The mass ratio of mud to the added waste hydrochloric acid is 3:1, the reaction temperature is 60°C, and the time is 1h to obtain a solid-liquid mixture (2); in the third step, the solid-liquid mixture (2) obtained after the second step is suction filtered Separation, the residue after separation is used for recycling aluminum and iron. The alkali content in the low-alkali red mud was detected by convention...
example 3
[0023] The first step is to crush the red mud. After grinding, the particle size of the red mud is 180 mesh, and mix it with water. The weight ratio of the Bayer process red mud to water is 1:8; CO2 is introduced into the Bayer process red mud 2 Carry out acidification reaction to obtain solid-liquid mixture (1); Pass into CO 2 The flow rate is 0.8L / min, the reaction temperature is 70°C, and the time is 1.5h; the second step is to add waste hydrochloric acid with a mass concentration of 20% to the solid-liquid mixture (1) obtained in the first step acidification reaction, Bayer The mass ratio of French red mud to the added waste hydrochloric acid is 3:1, the reaction temperature is 60°C, and the time is 1h to obtain a solid-liquid mixture (2); the third step, the solid-liquid mixture (2) obtained after the second step treatment Separation by suction filtration, the residue after separation and treatment is used for recovery of aluminum and iron. The alkali content in the low-...
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