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| Study on Leaching of Bauxite with Hydrochloric Acid |
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Received:March 19, 2011
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| DOI：DOI：10.3969/j.issn.1007-7545.2011.09.003 |
| KeyWord:Gibbsite; Acid leaching; Alumina |
| Author | Institution |
| ZHAO Ai-chun, ZHANG Ting-an, LV Guo-zhi, QV Hai-cui, MU Wang-zhong |
东北大学 材料与冶金学院，多金属共生矿生态化利用教育部重点试验室 |
| ZHAO Ai-chun, ZHANG Ting-an, LV Guo-zhi, QV Hai-cui, MU Wang-zhong |
东北大学 材料与冶金学院，多金属共生矿生态化利用教育部重点试验室 |
| ZHAO Ai-chun, ZHANG Ting-an, LV Guo-zhi, QV Hai-cui, MU Wang-zhong |
东北大学 材料与冶金学院，多金属共生矿生态化利用教育部重点试验室 |
| ZHAO Ai-chun, ZHANG Ting-an, LV Guo-zhi, QV Hai-cui, MU Wang-zhong |
东北大学 材料与冶金学院，多金属共生矿生态化利用教育部重点试验室 |
| ZHAO Ai-chun, ZHANG Ting-an, LV Guo-zhi, QV Hai-cui, MU Wang-zhong |
东北大学 材料与冶金学院，多金属共生矿生态化利用教育部重点试验室 |
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| Abstract: |
| The leaching experiments without roasting process were carried out with Australia gibbsite as material and hydrochloric acid as leaching reagent. Effects of temperature, granularity and time on leaching performance of bauxite were studied. The results show that the optimum leaching conditions are as follows. Granularity is -55 μm, leaching temperature is 100~110 ℃, and leaching time is 120 min when the concentration of HCl is 10% and L/S is 100:7. Under these conditions, the leaching rate of Al2O3 and Fe2O3 is 95.49% and 96.72%, respectively. In the single stage separation experiments of iron and aluminum by using tributyl-phosphate-benzol as extraction system, under the conditions of phase ratio of O/A of 1:1, concentration of hydrochloric acid of 1.5 mol/L and extraction time of 10 min, the extraction rate of iron is over 95%, loss rate of aluminum is 6% and βFe/Al can reach 408 with the above leaching solution as raw materials. βFe/Al is up to over 800 via three stages reflux extraction. When O/A equals to 1:1 and reacting time is 5-minute, the stripping ratio reaches 95% with pure water as stripping agent via single stage extraction at room temperature. |
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