二价锰盐还原KMnO_4合成锰矿物及其影响因素研究  

The process and influence factors of the synthesis of manganese minerals by the reactions between KMnO_4 and bivalent manganese salts

作　　者：马格[1] 刘凡[1] 黄丽[1] 孙萌萌[2] 

机构地区：[1]华中农业大学农业部长江中下游耕地保育重点实验室,湖北武汉430070 [2]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《岩石矿物学杂志》2013年第3期393-400,共8页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金(40971143);教育部博士点基金(20110146110027)

摘　　要：以二价锰盐还原KMnO4的方法合成锰矿物,运用X射线衍射(XRD)和扫描电镜(SEM)等手段对矿物的结构进行表征,探讨合成体系中锰摩尔比R(Mn2+:Mn7+)(分别为1:1、1:2、1:3、1:4)、合成温度(分别为30℃、50℃、70℃、90℃、110℃)以及阴离子类型(分别为Cl-、SO42-、NO3-)等条件对锰矿物形成的影响。研究表明:随着R从1:1到1:4逐渐减小,形成的锰矿物由锰钾矿向水钠锰矿转变,锰氧化度也相应的增加;阴离子类型的不同会影响反应所得矿物的种类和结晶度;随着合成温度的升高,锰矿物的结晶度增大,锰氧化度略有升高。Manganese minerals were synthesized by the reaction between KMnO4 and bivalent manganese salts. Crystal structure characteristics of the synthetic minerals were investigated by means of X-Ray Diffraction （XRD） and Scanning Electron Microscope （SEM）. The effects of mole ratio R of Mn^2＋ to Mn^7＋ （1：1, 1：2, 1：3 and 1：4 respectively）, synthetic temperature （30℃, 50℃, 70℃, 90℃ and 110℃ respectively）, and anionic species （Cl^- , SO4^2-, and NO3^- respectively） on the formation of the minerals were discussed. The results showd that the synthetic minerals were transformed from cryptomelane to birnessite with the decrease of R from 1：1 to 1：4, and the average oxidation state of manganese （AOSMn） increased correspondingly. Anionic species of the reactants affected the type and crystalline of the synthetic minerals. Within the experimental synthetic temperature （30-110℃ ）, the crystallinity and AOSMn of the synthetic minerals rose slightly as the temperature increased.

关 键 词：二价锰盐 高锰酸钾 水钠锰矿 锰摩尔比 阴离子类型 合成温度 

分 类 号：P579[天文地球—矿物学]