(東北大學(xué)多金屬共生礦生態(tài)化冶金教育部重點(diǎn)實(shí)驗(yàn)室，沈陽 110819)
摘 要: 研究機(jī)械活化對閃鋅礦的物化性質(zhì)以及焙燒宏觀動力學(xué)的影響，采用X射線衍射儀、掃描電鏡、激光粒度分析儀、比表面積測試儀、熱重分析，分析活化前后閃鋅礦的晶體結(jié)構(gòu)、表觀形貌、粒度和比表面積的變化規(guī)律。使用MDTA分析法研究未活化與機(jī)械活化閃鋅礦在空氣氣氛下的氧化焙燒宏觀動力學(xué)。結(jié)果表明：機(jī)械活化使閃鋅礦的物化性質(zhì)發(fā)生明顯改變。在焙燒過程中，經(jīng)過機(jī)械活化的閃鋅礦氧化速率遠(yuǎn)大于未活化閃鋅礦的。機(jī)械活化可顯著提高閃鋅礦的反應(yīng)活性。經(jīng)機(jī)械活化30、120 min后，閃鋅礦在焙燒過程中的表觀活化能由未活化時(shí)的239.78 kJ/mol分別降至171.25和57.17 kJ/mol。并計(jì)算出其相應(yīng)的非等溫氧化動力學(xué)方程。
關(guān)鍵字: 閃鋅礦；焙燒宏觀動力學(xué)；機(jī)械活化；表觀活化能；非等溫動力學(xué)方程
（Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education,
Northeastern University, Shenyang 110819, China）
Abstract:The sphalerite was mechanically activated by a high performance ball, and the physical and chemical properties and roasting kinetics were studied. The effects of the variation in crystalline structure, morphology, panicle size and specific surface area of the non-activated and mechanically activated sphalerite concentrates were characterized by X-ray diffractometry, scanning electron microscopy, thermal analysis, particle size analyzer and volumetric adsorption analyzer, respectively. The roasting macrokinetics of unactivated and mechanically activated were investigated using differential thermal analysis (DTA) in oxygen. The results show that the physicochemical properties of sphalerite are changed obviously by mechanically activation. In the roasting process, the oxidation rate of sphalerite activated sphalerite is much faster than that of non-activated sphalerite. Reaction activity of sphalerite is significantly improved by mechanical activation. When sphalerite is mechanically activated for 30 min and 120 min, the apparent activation energy decreases from 239.78 kJ/mol of non-activated sphalerite to 171.25 and 57.17 kJ/mol, respectively. The corresponding non-isothermal oxidation kinetics equations were calculated.
Key words: sphalerite; roasting macro kinetics; mechanical activation; physicochemical property; apparent activation energy; non-isothermal kinetics equation
