文献类型：期刊文献

中文题名：活化煤气化粗渣盐酸浸取机理研究

英文题名：Hydrochloric acid leaching mechanism of activated coarse coal gasification slag

作者：马小路[1];袁梦霞[1];乔秀臣[1]

机构：[1]华东理工大学资源与环境工程学院,上海200237

年份：2016

卷号：48

期号：12

起止页码：64

中文期刊名：无机盐工业

外文期刊名：Inorganic Chemicals Industry

收录：CSTPCD;;北大核心:【北大核心2014】；

基金：国家"863"计划项目(2011AA06A102);博士点基金项目(20110074110002)

语种：中文

中文关键词：煤气化粗渣;浸取机理;Avrami模型;缩芯模型

外文关键词：coarse coal gasification slag ;leaching mechanism ; Avrami model ; shrinking core model

摘要：考察了颗粒粒径、盐酸浓度和浸取温度3个条件对活化煤气化粗渣(简称活化渣)中铝、铁、钙离子浸取率的影响,并对浸取机理进行了研究。实验结果表明,活化渣为钙铝黄长石(2CaO·Al_2O_3·SiO_2)与三氧化二铁(Fe_2O_3)的固溶体,与盐酸反应后颗粒粒径不断减小,钙离子较铝、铁离子优先浸出,其浸取过程符合化学反应控制的缩芯模型,相应的表观活化能为71.3 k J/mol;钙离子浸出后活化渣颗粒成为疏松多孔材料,铝、铁离子的浸取过程则符合Avrami模型,二者的浸取反应均受内扩散控制,表观活化能分别为24.7 k J/mol和22.5 k J/mol。
The effects of particle size, hydrochloric acid concentration, and leaching temperature on the leaching ratios of alu- minum, iron, and calcium ions from activated coarse coal gasification slag were investigated.The leaching mechanism of each ion was also discussed.Results showed that the activated coarse coal gasification slag was a solid solution of gehlenite （2CaO. Al2O3· SiO2） and Fe2O3, which decreased in particle size after the hydrochloric acid leaching.The calcium cation was easier to be leached than aluminum and iron ions and its leaching process fitted the shrinking core model controlled by the chemical reaction.The apparent activation energy of calcium cation was 71.3 kJ/mol.The leaching processes of aluminum and iron ions fitted the Avrami model controlled by the internal diffusion.The apparent activation energy of aluminum and iron ions were 24.7 kJ/mol and 22.5 kJ/mol, respectively.