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以难选冶金精矿为原料,三相流化床中硝酸氧化金精矿反应过程中铁的转化率为实验指标,考察了气速、硝酸浓度、温度和粒径等因素对铁转化率的影响,研究了三相流化床中硝酸氧化金精矿的反应动力学。结果表明:在三相流化床中,铁的转化率受气速、硝酸浓度、温度和粒径等因素的影响。随着气速、硝酸浓度及反应温度的增加,转化率均有所提高,而随着金精矿粒径的增加,转化率降低。三相流化床中硝酸氧化难选冶金精矿符合颗粒缩小的缩核模型,反应活化能为43.2 kJ/mol,属于化学控制。
Taking refractory metallurgical concentrate as raw material, the conversion rate of iron in the process of reaction of gold nitrate oxidation in three-phase fluidized bed was taken as the experimental index. The effects of gas velocity, nitric acid concentration, temperature and particle size on iron conversion were investigated , Studied the reaction kinetics of nitric acid oxidation of gold concentrate in a three-phase fluidized bed. The results show that in the three-phase fluidized bed, the iron conversion rate is affected by gas velocity, nitric acid concentration, temperature and particle size. With the increase of gas velocity, nitric acid concentration and reaction temperature, the conversion rate increased, while with the increase of particle size of gold concentrate, the conversion rate decreased. The three-phase fluidized bed nitric acid oxidation of refractory metallurgical concentrate in line with particle shrinkage reduction model, the reaction activation energy of 43.2 kJ / mol, are chemical control.