RECOVERY OF IRON AND ALUMINUM FROM RED MUD BY OXALIC ACID LEACHING AND SOLAR PHOTOCATALYSIS

HUANG Quan-li; HUANG Kui; LU Yuan-huan; LIU Yu-ling; XIONG Hao; DONG Hai-li

doi:10.13205/j.hjgc.202112030

Volume 39 Issue 12

Mar. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(12): 199-205

HUANG Quan-li, HUANG Kui, LU Yuan-huan, LIU Yu-ling, XIONG Hao, DONG Hai-li. RECOVERY OF IRON AND ALUMINUM FROM RED MUD BY OXALIC ACID LEACHING AND SOLAR PHOTOCATALYSIS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 199-205. doi: 10.13205/j.hjgc.202112030

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HUANG Quan-li, HUANG Kui, LU Yuan-huan, LIU Yu-ling, XIONG Hao, DONG Hai-li. RECOVERY OF IRON AND ALUMINUM FROM RED MUD BY OXALIC ACID LEACHING AND SOLAR PHOTOCATALYSIS[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(12): 199-205. doi: 10.13205/j.hjgc.202112030

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RECOVERY OF IRON AND ALUMINUM FROM RED MUD BY OXALIC ACID LEACHING AND SOLAR PHOTOCATALYSIS

doi: 10.13205/j.hjgc.202112030

School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China

Received Date: 2020-11-10
Available Online: 2022-03-30
Publish Date: 2022-03-30

Abstract

Abstract

The process of extraction of iron and aluminum from red mud by using oxalic acid leaching was investigated systematically. The effect of oxalic acid addition, leaching time, leaching temperature and liquid to solid ratio on the leaching efficiency were investigated respectively, and the response surface method was used to the optimize the preparation process based on the single-factor experiment results. The Fe(Ⅲ) oxalate in the leaching solution was reduced to Fe(Ⅱ) oxalate by using sunlight irradiation. The experiment results showed that the regression equation model was of great significant. The optimized processing conditions for leaching rate were as follows: the oxalic acid concentration of 0.30 g/mL, the liquid-solid ratio of 14∶1, reaction temperature of 95 ℃, reaction time of 150 min. Under the optimal conditions, the leaching rates of iron and aluminum were up to 87.76% and 74.60%, respectively. The total iron concentration decreased from 1.152 g/L to 0.173 g/L in the extracted solution, and more than 85% Fe(Ⅲ) oxalate was transformed into the Fe(Ⅱ) oxalate crystallite within 420 min by using sunlight irradiation. The aluminum and oxalic acid in the filtrate could be recovered by means of adjusting pH value, filtration, and evaporation crystallization successively. The study provides new technical routine for the recovery of iron and aluminum from red mud.
- red mud,
- oxalic acid leaching,
- response surface,
- valuable metals

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References(24)

References

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