CO 矿化反应基础研究.PDF

第39卷 第9期 燃摇 料摇 化摇 学摇 学摇 报 Vol.39 No.9 2011年9月 Journal of Fuel Chemistry and Technology Sep. 2011 文章编号:0253鄄2409(2011)09鄄0706鄄06 CO 矿化反应基础研究2 I.镁橄榄石和蛇纹石盐酸浸出动力学研究 1,2 1 1 张建树 ,张摇 荣 ,毕继诚 (1.中国科学院山西煤炭化学研究所 煤转化国家重点实验室,山西 太原摇 030001;2.中国科学院研究生院,北京摇 100049) 摘摇 要:对盐酸浸取镁橄榄石和蛇纹石的过程进行了研究,考察了酸浓度、浸取温度对镁浸出率的影响。 结果表明,提高酸浓 度和浸取反应温度能够提高镁橄榄石和蛇纹石中镁的浸出率。 采用单粒级矿物原料浸出实验获得的动力学数据,利用收缩 核模型分析了橄榄石和蛇纹石的镁浸出过程动力学,镁橄榄石浸出动力学属表面化学反应控制,而蛇纹石浸出反应为产物层 扩散控制。 两种矿物结构的差异影响镁浸出的难易程度,也决定了不同的浸出动力学行为。 关键词:CO 矿化;橄榄石;蛇纹石;浸出;动力学2 中图分类号:TF111.31;X701.7摇 摇 文献标识码:A Fundamental research on CO mineralization: 2 I. Leaching kinetics of forsterite and serpentine with hydrochloric acid 1,2 1 1 ZHANGJian鄄shu ,ZHANG Rong ,BI Ji鄄cheng (1.StateKey Laboratory of Coal Conversion,Institute of Coal Chemistry,ChineseAcademy of Sciences,Taiyuan摇 030001,China; 2.Graduate University of ChineseAcademy of Sciences,Beijing摇 100049,China) Abstract:The leaching of forsterite and serpentine was investigated and the effects of hydrochloric acid concentration and temperature were examined. Magnesium dissolution extent increases with the increase of hydrochloric acid concentration and temperature. The reactivity of forsterite is relative higher than that of serpentine. Furthermore,amodifiedunreacted shrinkingcoremodelwasusedtodeterminethedissolutionkinetic parameters. The dissolution of forsterite is controlled by the surface reaction control. However,the serpentine dissolution is controlled by the product layer diffusion. The difference of dissolution extent and kinetics of two mi