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| Dissolution Kinetics of High Iron Gibbsitic Bauxite |
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Received:August 27, 2015
Revised:August 31, 2015
Accepted:September 06, 2015
Published Online:January 21, 2016
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| DOI：doi：10.3969/j.issn.1007-7545.2016.02.005 |
| KeyWord:gibbsite; dissolution; kinetics; iron oxide |
| Author | Institution |
| Yang Hui-bin |
东北大学 |
| Tu gan-feng |
东北大学 |
| Pan xiao-lin |
东北大学 |
| Yu hai-yan |
东北大学 |
| Hu jian |
大唐国际高铝煤炭研发中心,国家能源高铝煤炭资源开发利用重点实验室 |
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| Abstract: |
| The leaching kinetics of high iron gibbsite bauxite were studied. The effects of bauxite particle size, caustic soda concentration in solution, digestion temperature, and stirring speed on digestion were investigated. The results show that dissolution rate of bauxite is 90% above at atmospheric pressure. Dissolution speeds by either raising dissolution temperature or concentration of caustic soda or decreasing bauxite particle size. With effect of particle size, sodium hydroxide concentration and stirring speed into consideration, the kinetics equation can be deduced and shown as:1-2/3 α-(1-α)^(2/3)=1.28×〖10〗^15×(c_NaOH )^1.70×d^(-0.36)×r^0.74×e^(-117402/RT)×t。The solid layer reduces dissolution speed of gibbsite and the limiting step is diffusion. |
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