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Gallium Recovery from Alumina Red Mud with Hydrochloric Acid Leaching

Gao Yan

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Abstract

The hydrochloric acid leaching process of gallium from Bayer red mud was studied.The effects of leaching temperature,time,ratio of liquid to solid(L/S) and concentration of hydrochloric acid on the leaching rate of gallium were investigated with orthogonal test.The results show that the leaching rate of gallium is 95.4% under the optimum conditions including hydrochloric acid concentration of 8 mol/L,L/S=4.0,5 hours leaching at 109 ℃.The extraction rate of gallium reaches 98% with 50% TBP+50% kerosene,the stripping rate of gallium is 96.8% with 0.5% salt solution.The stripping solution is neutralized with 0.5mol/L NaOH solution and then filtrated and dried.The gallium mass percentage is 4.32% in solid and is enriched 136-fold from the red mud.The total gallium recovery is above 85%.

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What this paper is about

The hydrochloric acid leaching process of gallium from Bayer red mud was studied.The effects of leaching temperature,time,ratio of liquid to solid(L/S) and concentration of hydrochloric acid on the leaching rate of gallium were investigated with orthogonal test.The results show that the leaching rate of gallium is 95.4% under the optimum conditions including hydrochloric acid concentration of 8 mol/L,L/S=4.0,5 hours leaching at 109 ℃.The extraction rate of gallium reaches 98% with 50% TBP+50% kerosene,the stripping rate of gallium is 96.8% with 0.5% salt solution.The stripping solution is neutralized with 0.5mol/L NaOH solution and then filtrated and dried.The gallium mass percentage is 4.32% in solid and is enriched 136-fold from the red mud.The total gallium recovery is above 85%.

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Available abstract

The hydrochloric acid leaching process of gallium from Bayer red mud was studied.The effects of leaching temperature,time,ratio of liquid to solid(L/S) and concentration of hydrochloric acid on the leaching rate of gallium were investigated with orthogonal test.The results show that the leaching rate of gallium is 95.4% under the optimum conditions including hydrochloric acid concentration of 8 mol/L,L/S=4.0,5 hours leaching at 109 ℃.The extraction rate of gallium reaches 98% with 50% TBP+50% kerosene,the stripping rate of gallium is 96.8% with 0.5% salt solution.The stripping solution is neutralized with 0.5mol/L NaOH solution and then filtrated and dried.The gallium mass percentage is 4.32% in solid and is enriched 136-fold from the red mud.The total gallium recovery is above 85%.

Key concepts: Gallium, Hydrochloric acid, Leaching (pedology), Kerosene, Chemistry, Nuclear chemistry, Red mud, Hydrometallurgy

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