Abstract: Potassium nitrate was added to intensify the chromite decomposition process by KOH sub-molten salt. The effects of the mass ratio of alkali-to-ore，the mass ratio of KNO3-to-ore，oxygen partial pressure，gas flow rate and reaction temperature on the decomposition of chromite ore were experimentally studied to determine the chromite decomposition parameters by KOH-KNO3 binary sub-molten salt. The results showed that reaction temperature and the ratio of alkali-to-ore were most significant factors on the chromium conversion efficiency. The effects of oxygen partial pressure and flow rate were less significant. The ratio of KOH-to-ore decreased from 4∶1 to 2∶1 after adding KNO3 to KOH sub-molten salt. The kinetics equation of chromite decomposition was“1+2(1－x)－3(1－x)2/3=kt”，and the apparent activation energy was 55.63 kJ/mol，which agreed with the inner-diffusion control model. KNO3 played a significant role in oxygen transfer，which obviously promoted the decomposition of chromate ore.

摘要： 通过采用添加硝酸钾的方法以强化铬铁矿的KOH亚熔盐氧化分解过程。实验考察了碱矿比、盐矿比、氧分压、气体流量以及反应温度等工艺参数对铬铁矿分解过程的影响，以明确KOH-KNO3二元亚熔盐分解铬铁矿的分解条件。结果表明，反应温度与碱矿比对铬转化率影响显著，氧气分压与气体流量的影响次之。在KOH亚熔盐体系中加入KNO3后，碱矿比可由4∶1降到2∶1；铬铁矿分解过程的动力学方程符合1+2(1－x)－3(1－x)2/3=kt，表观活化能为55.63 kJ/mol，为内扩散控制过程。KNO3通过强化氧传递过程而明显促进了铬铁矿的分解。