(1. 昆明冶金研究院 冶金研究所，昆明 6500931；
2. 昆明理工大學 真空冶金國家工程實驗室，昆明 650093；
3. 湖南武岡市第二中學，武岡 422400)
摘 要: 研究加壓浸出過程中鹽酸溶液提純冶金級硅過程的動力學特征以及去除雜質(zhì)Al時顆粒粒度、反應溫度、總壓強、鹽酸初始濃度等因素對動力學的影響。結(jié)果表明：反應過程符合核收縮模型的固態(tài)產(chǎn)物層擴散方程；反應過程中，表觀反應活化能為34.067 kJ/mol，表觀反應級數(shù)為0.346。硅粉粒度、溫度、壓強和鹽酸濃度共同對Al去除率的影響的動力學數(shù)學模型經(jīng)過不同條件下實驗結(jié)果與計算結(jié)果進行對比驗證，使用該模型計算所得結(jié)果與實驗結(jié)果吻合較好。
關(guān)鍵字: 冶金級硅；高壓浸出；動力學；雜質(zhì)；Al去除
（1. Department of Metallurgy Research, Kunming Metallurgy Research Institute, Kunming 650031, China;
2. National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology,
Kunming 650093, China;
3. The Second Middle School of Wugang City, Wugang 422400, China）
Abstract:The kinetics of pressure leaching of purification of metallurgical grade silicon with hydrochloric acid was investigated. The effects of particle size, temperature, total pressure and acid concentration on the kinetics and mechanism of aluminum removal were studied. The results show that the reaction kinetic model follows the shrinking core model and the apparent activation energy (Ea) of the leaching reaction is 34.067 kJ/mol, and the apparent reaction order of aluminum removal with pressure leaching is 0.346. The kinetic equations for the effect of particle size, temperature, total pressure and acid concentration are obtained and a mathematical model of aluminum removal rate from metallurgical grade Si (MG-Si) is developed. The equation estimates the aluminum removal with very good agreement between experimental and calculated values.
Key words: metallurgical grade silicon; pressure leaching; kinetics; purity; aluminum removal
