(1. 江西理工大學(xué) 綠色冶金與過程強化研究所，贛州 341000；
2. 東北大學(xué) 多金屬共生礦生態(tài)化冶金教育部重點實驗室，沈陽 110819)
摘 要: 研究了閃鋅礦加壓攪拌浸出體系下Mn2+催化機理與動力學(xué)。將ZnS和FeS燒結(jié)制備人造閃鋅礦，并用于加壓酸浸實驗。通過使用自行設(shè)計的電位高壓釜研究壓力浸出系統(tǒng)的電位變化。結(jié)果表明：隨著浸出時間的推移直到浸出結(jié)束，體系電位持續(xù)升高，故Mn2+在多大程度上能夠?qū)崿F(xiàn)催化作用，取決于Mn2+氧化為MnO2的反應(yīng)速度和控制條件。隨著溫度、硫酸濃度、氧分壓的增大，相應(yīng)的氧壓浸出速率及浸出率均有較大的提高，最終，通過閃鋅礦氧壓酸浸動力學(xué)模型的分析得出，在Mn2+催化浸出體系下，反應(yīng)活化能為27.34 kJ/mol，硫酸濃度、氧分壓及Mn2+用量的反應(yīng)級數(shù)分別為1.23、1.64和0.36，表明其應(yīng)遵循化學(xué)反應(yīng)及表面擴散混合控制的收縮核模型，并建立了相應(yīng)的動力學(xué)方程。
關(guān)鍵字: Mn2+催化機理；人造閃鋅礦；浸出動力學(xué)；加壓浸出；體系電位
（1. Institute of Green Metallurgy and Process Intensification, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China）
Abstract:The catalytic mechanism and kinetics of Mn2+ under the sphalerite pressurized agitation leaching system were studied. Artificial sphalerite was prepared by sintering ZnS and FeS and used in pressure acid leaching experiment. The potential changes of pressure leaching system were studied by using the autoclave designed by ourselves. The results show that as the leaching time goes on until the end of leaching, the system potential continues to increase, so the extent to which Mn2+ can achieve catalytic action depended on the reaction conditions of oxidation of Mn2+ into MnO2. With the increases of temperature, acidity and oxygen partial pressure, the corresponding oxygen pressure leaching speed and leaching rate all have large increase at the end, through the analysis of sphalerite oxygen pressure acid leaching kinetics model, in manganese ion catalyzed leaching system, the activation energy is 27.34 kJ/mol, the dosage of sulfuric acid, oxygen partial pressure and Mn2+ reaction series are 1.23, 1.64 and 0.36, respectively, showing that it should follow and surface chemical reaction diffusion retract model of hybrid control, and the corresponding dynamic equation is established.
Key words: Mn2+ catalytic mechanism; artificial sphalerite; leaching kinetics; pressure leaching; system potential
