钠化焙烧钛渣的酸浸动力学研究
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摘要
研究了钠化焙烧—酸浸工艺制备高钛渣过程中酸浸动力学、酸浸溶出规律和溶出反应的控制步骤,探讨了反应温度、盐酸浓度、搅拌速度对钛转化率的影响。结果表明,在下述最优工艺条件下,钛转化率达93%,TiO2品位达98.68%:搅拌速度400r/min、液固比10∶1、酸浓度20%、110℃酸浸90min。钛渣焙烧产物酸浸过程受固体产物层的内扩散控制,钛渣酸浸过程符合收缩未反应核模型,表观活化能为11.37kJ/mol,浸出钛渣动力学方程为1+2(1-x)-3(1-x)~(2/3)=0.244exp[-11370/(RT)]t。
Acid leaching kinetics,acid leaching dissolution rule,and control steps of dissolution reaction of high titanium slag prepared by sodium salt roasting and acid leaching were analyzed.The effects of reaction temperature,hydrochloric acid concentration,and stirring speed on titanium conversion rate were investigated.The results show that titanium conversion rate is 93%above,and TiO_2 content in product is98.68% under the optimum conditions including stirring speed of 400r/min,L/S of 10∶1,hydrochloric acid concentration of 20%,leaching temperature of 110℃,and leaching time of 90 min.Decomposition of titanium slag is controlled by mass diffusion in residual layer with apparent activation energy of 11.37kJ/mol,which is in accordance with unreacted shrinking core mode.Leaching dynamics equation of titanium slag can be described as 1+2(1-x)-3(1-x)~(2/3)=0.244exp[-11370/(RT)]t.
Acid leaching kinetics,acid leaching dissolution rule,and control steps of dissolution reaction of high titanium slag prepared by sodium salt roasting and acid leaching were analyzed.The effects of reaction temperature,hydrochloric acid concentration,and stirring speed on titanium conversion rate were investigated.The results show that titanium conversion rate is 93%above,and TiO_2 content in product is98.68% under the optimum conditions including stirring speed of 400r/min,L/S of 10∶1,hydrochloric acid concentration of 20%,leaching temperature of 110℃,and leaching time of 90 min.Decomposition of titanium slag is controlled by mass diffusion in residual layer with apparent activation energy of 11.37kJ/mol,which is in accordance with unreacted shrinking core mode.Leaching dynamics equation of titanium slag can be described as 1+2(1-x)-3(1-x)~(2/3)=0.244exp[-11370/(RT)]t.
引文
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[3]周林,徐涛,方树铭,等.一种降低高钙镁钛渣中含钙镁含量的方法:201310015661.7[P].2013-04-03.
[4]刘娟.UGS渣生产工艺研究[D].昆明:昆明理工大学,2013.
[5]陈朝轶,张曼,李军旗,等.升温速率对钛渣赤泥粉煤灰微晶玻璃析晶的影响[J].有色金属(冶炼部分),2015(10):67-70.
[6]BASLL JARISH,ST LAMBERT.Upgrading ore slag for production of synthetic rutile:US4083363[P].1977-07-16.
[7]隋丽丽,翟玉春.硫酸氢铵焙烧高钛渣的溶出动力学研究[J].材料导报,2013,27(9):137-141.
[8]SUI Lili,ZHAI Yuchun.Reaction kinetics of roasting high-titanium slag with concentrated sulfuric acid[J].Trans.Nonferrous Met.Soc.China,2014,24(3):848-853.
[9]WANG Dong,CHU Jinglong,LIU Yahui.Novel Process for Titanium Dioxide Production from Titanium Slag:NaOH-KOH Binary Molten Salt Roasting and Water Leaching[J].Industrial&Engineering Chemistry Research,2013,52:15756-15762.
[10]ZHAO Longsheng,LIU Yahui,WANG Lina.Production of Rutile TiO2 Pigment from Titanium Slag Obtained by Hydrochloric Acid Leaching of Vanadium-Bearing Titanomagnetite[J].Industrial&Engineering Chemistry Research,2014,53:70-77.
[11]XUE Tianyan,WANG Lina,QI Tao.Decomposition kinetics of titanium slag in sodium hydroxide system[J].Hydrometallurgy,2009,95:22-27.
[12]华一新.冶金过程动力学导论[M].北京:冶金工业出版社,2004:28.
[13]ZHANG S C,MICHAEL J NICOL.Kinetics of the dissolution of ilmenite in sulfuric acid solutions under reducing conditions[J].Hydrometallurgy,2010,103(1/2/3/4):196-204.
[14]吴玉林,徐志峰,郝士涛.炼铜烟灰碱浸脱砷的热力学及动力学[J].有色金属(冶炼部分),2013(4):3-7.