(1. 沈阳理工大学 材料科学与工程学院，沈阳 110159；2. 东北大学 材料与冶金学院，沈阳 110004；
3. 东北大学 资源与土木工程学院，沈阳 110004)
摘 要: 对铁尾矿在NaOH-NaNO3熔盐体系中的分解动力学进行研究，考察了反应温度、反应时间及碱渣比对铁尾矿中SiO2浸出率的影响。结果表明：铁尾矿在NaOH-NaNO3熔盐体系中的分解符合未反应收缩核模型，受固体产物层内扩散控制，提高反应温度、延长反应时间或增加碱渣比均能提高铁尾矿的分解率；在一定的操作条件下，根据Arrherius方程得到铁尾矿在NaOH-NaNO3亚熔盐体系中的反应活化能为17.43 kJ/mol。
关键字: 铁尾矿；熔盐法；NaOH-NaNO3；动力学
NaOH-NaNO3 molten salt method
（1. School of Material Science and Engineering, Shenyang Ligong University, Shenyang 110159, China;
2. School of Material and Metallurgy, Northeastern University, Shenyang 110004, China;
3. School of Resource and Civil Engineering, Northeastern University, Shenyang 110004, China）
Abstract:The decomposing kinetics of iron ore tailings in NaOH-NaNO3 molten salt was investigated. The effects of reaction temperature, reaction time and NaOH-to-SiO2 ratio on leaching rate of SiO2 in iron ore tailing were also studied. The results show that the decomposing process of iron ore tailings in NaOH-NaNO3 is well interpreted with the unreacted shrinking core model under diffusion reaction control. The decomposition rate of iron ore tailings increases with increasing the reaction temperature, reaction time and NaOH-to-SiO2 ratio. Under the specific operating conditions, the activation energy for the decomposition of iron ore tailings is calculated according to Arrhenius expression. The apparent activation energy is 17.43 kJ/mol as calculated from the experimental data.
Key words: iron ore tailings; molten salt method; NaOH-NaNO3; kinetics
