活化煤气化粗渣盐酸浸取机理研究

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·Al2O3·SiO2）与三氧化二铁（Fe2O3）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 kJ/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 kJ/mol和22.5 kJ/mol。

Hydrochloric acid leaching mechanism of activated coarse coal gasification slag

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.