(1. 河南師范大學 化學與環(huán)境科學學院，新鄉(xiāng) 453007；
2. 中國科學院 過程工程研究所，北京 100080)
摘 要: 對鈦鐵礦在氫氧化鉀亞熔鹽體系中的分解動力學進行研究，考察反應溫度及礦粒粒徑對鈦鐵礦分解率的影響。結果表明：鈦鐵礦在氫氧化鉀亞熔鹽體系中的分解符合未反應收縮核模型，受界面化學反應控制；提高反應溫度或減小礦粒粒徑均能提高鈦鐵礦的分解率。在一定的操作條件下，根據Arrherius方程得到鈦鐵礦在氫氧化鉀亞熔鹽體系中的分解活化能，且活化能隨礦粒粒徑的減小而減小；當礦粒粒徑為58~180 µm時，鈦鐵礦的分解活化能為54.78~46.82 kJ/mol。
關鍵字: 鈦鐵礦；亞熔鹽法；KOH；分解
KOH sub-molten salt method
（1. College of Chemistry and Environmental Science, Henan Normal University, Xinxiang 453007, China;
2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China）
Abstract:The decomposing kinetics of ilmenite in KOH sub-molten salt was investigated. The effects of factors, such as reaction temperature and particle size of the ore, on the decomposition rate of ilmenite were also studied. The results show that the decomposing process of ilmenite in KOH sub-molten salt is well interpreted with the unreacted shrinking core model under chemical reaction control. The decomposition rate of ilmenite increases with increasing the reaction temperature and decreasing the particle size. Under the specific operating conditions, the activation energy for the decomposition of ilmenite is calculated according to Arrhenius expression, and its values decrease with decreasing the particle size of the ore. When the particle size of the ore varies from 58 µm to 180 µm, the activation energy varies from 46.82 kJ/mol to 54.78 kJ/mol.
Key words: ilmenite; sub-molten salt method; KOH; decomposition
