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投稿时间:2015-08-27 修订日期:2015-08-31 录用日期:2015-09-06 网络发布日期:2016-01-21
投稿时间:2015-08-27 修订日期:2015-08-31 录用日期:2015-09-06 网络发布日期:2016-01-21
中文摘要: 研究了高铁三水铝石矿常压条件下的溶出动力学。分别考察了矿石粒度、氢氧化钠浓度、溶出温度、搅拌速度对溶出性能的影响。研究发现,常压条件下矿石溶出率大于90%。提高溶出温度或氢氧化钠浓度、减小矿石粒度均可加快矿石的溶出速度。综合考虑矿石粒度、氢氧化钠浓度和搅拌速度的影响,推导出高铁三水铝石矿溶出动力学经验方程为: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。该方程与内扩散控制的动力学模型吻合较好,反应速率受包覆在晶体表面的针铁矿和赤铁矿固体膜层所控制。
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.
keywords: gibbsite dissolution kinetics iron oxide
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基金项目:国家自然科学基金资助项目(51104041)
引用文本:
杨会宾,涂赣峰,潘晓林,于海燕,胡剑.高铁三水铝石矿溶出动力学[J].有色金属(冶炼部分),2016(2):18-22.
Yang Hui-bin,Tu gan-feng,Pan xiao-lin,Yu hai-yan,Hu jian.Dissolution Kinetics of High Iron Gibbsitic Bauxite[J].Nonferrous Metals (Extractive Metallurgy),2016(2):18-22.
杨会宾,涂赣峰,潘晓林,于海燕,胡剑.高铁三水铝石矿溶出动力学[J].有色金属(冶炼部分),2016(2):18-22.
Yang Hui-bin,Tu gan-feng,Pan xiao-lin,Yu hai-yan,Hu jian.Dissolution Kinetics of High Iron Gibbsitic Bauxite[J].Nonferrous Metals (Extractive Metallurgy),2016(2):18-22.

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