Kinetics of roasting potash feldspar in presence of sodium carbonate  

作　　者：LIU Jia-nan ZHAI Yu-chun WU Yan ZHANG Jun SHEN Xiao-yi 刘佳囡;翟玉春;吴艳;张俊;申晓毅

机构地区：[1]School of Metallurgy,Northeastern University,Shenyang 110819,China [2]School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China

出　　处：《Journal of Central South University》2017年第7期1544-1550,共7页中南大学学报（英文版）

基　　金：Project(51204054)supported by the National Natural Science Foundation of China;Project(2007CB613603)supported by the National Basic Research Program of China;Project(N140204011)supported by the Ministry of Education Basic Scientific Research Business Expenses,China

摘　　要：A novel process was proposed for the utilization of potash feldspar by roasting in the presence of sodium carbonate. The effects of roasting temperature, granularity, molar ratio of sodium carbonate to potash feldspar and roasting time on the silica extraction rate were investigated. Under the optimal roasting conditions, the silica extraction rate was 98%. The optimal conditions, determined using an orthogonal experiment, were found to be roasting temperature of 875 A degrees C, potash feldspar granularity of 74-89 mu m, molar ratio of sodium carbonate to potash feldspar of 1.2:1, and roasting time of 80 min. The kinetics of potash feldspar roasting in the presence of sodium carbonate was described by the shrinking core model and the reaction rate was found to be controlled by the chemical reaction at the particle surface. According to the Arrhenius expression, the activation energy was 164.99 kJ/mol, and the process could be expressed as [1-(1-alpha)(1/3)]=2.66x10(5) exp[-164990/(RT)] t.A novel process was proposed for the utilization of potash feldspar by roasting in the presence of sodium carbonate.The effects of roasting temperature,granularity,molar ratio of sodium carbonate to potash feldspar and roasting time on the silica extraction rate were investigated.Under the optimal roasting conditions,the silica extraction rate was 98%.The optimal conditions,determined using an orthogonal experiment,were found to be roasting temperature of 875 °C,potash feldspar granularity of 74– 89 μm,molar ratio of sodium carbonate to potash feldspar of 1.2:1,and roasting time of 80 min.The kinetics of potash feldspar roasting in the presence of sodium carbonate was described by the shrinking core model and the reaction rate was found to be controlled by the chemical reaction at the particle surface.According to the Arrhenius expression,the activation energy was 164.99 k J/mol,and the process could be expressed as [1-(1-α)1/3]=2.66×105 exp[-164990/(RT)] t.

关 键 词：POTASH FELDSPAR SODIUM CARBONATE ROASTING KINETICS silica 

分 类 号：TF046.2[冶金工程—冶金物理化学]