(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083； 2. 中南大學(xué) 有色金屬資源循環(huán)利用湖南省重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083； 3. 中南大學(xué) 有色金屬資源循環(huán)利用湖南省工程研究中心，長(zhǎng)沙 410083)
摘 要: 采用動(dòng)力學(xué)研究的方法對(duì)鹽酸體系中輝銻礦的臭氧協(xié)同氧化浸出過(guò)程進(jìn)行了研究，分別探索了溫度、鹽酸濃度、氣體流量和攪拌速度等因素對(duì)該過(guò)程中銻浸出率的影響；在此基礎(chǔ)上，對(duì)該浸出過(guò)程進(jìn)行動(dòng)力學(xué)計(jì)算。結(jié)果表明：在溫度75 ℃、鹽酸濃度4.50 mol/L、氣體流量2.0 L/min和攪拌速度500 r/min的條件下浸出50 min后，銻浸出率可以達(dá)到59.13 %。輝銻礦的臭氧協(xié)同氧化浸出符合收縮核模型，過(guò)程反應(yīng)速率受混合過(guò)程控制，計(jì)算得到表觀活化能為15.98 kJ/mol，并最終建立了該浸出過(guò)程的動(dòng)力學(xué)總方程式。
關(guān)鍵字: 鹽酸；輝銻礦；臭氧；浸出；動(dòng)力學(xué)
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China; 2. Hunan Key Laboratory of Nonferrous Metal Resources Recycling, Central South University, Changsha 410083, China; 3. Hunan Engineering Research Center of Nonferrous Metal Resources Recycling, Central South University, Changsha 410083, China）
Abstract:A kinetic study method was used to study the synergistic oxidation and leaching of lanthanide with ozone in the hydrochloric acid system. The factors affecting the leaching rate such as temperature, concentration of hydrochloric acid, gas flow rate and stirring speed were investigated. On this basis, the kinetics of the leaching process was calculated. The results show that the antimony extraction is 59.13% after leaching for 50min at the conditions of temperature 75 ℃, hydrochloric acid concentration 4.50 mol/L, gas flow rate 2.0 L/min, and stirring speed 500 r/min. The process is consistent with the shrinkage model, the process reaction rate is controlled by the mixing process, the apparent activation energy calculated is 15.98 kJ/mol, and the general equation of dynamics of the leaching process is finally established.
Key words: hydrochloric acid; stibnite; ozone; leaching; kinetics
