二价锰盐还原KMnO4合成锰矿物及其影响因素研究
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国家自然科学基金(40971143); 教育部博士点基金(20110146110027)


The process and influence factors of the synthesis of manganese minerals by the reactions between KMnO4 and bivalent manganese salts
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    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。

    Abstract:

    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 Mn2+ to Mn7+(1:1, 1:2, 1:3 and 1:4 respectively), synthetic temperature (30℃, 50℃, 70℃, 90℃ and 110℃ respectively), and anionic species (Cl-, SO42-, 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.

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马格,刘凡,黄丽,孙萌萌,2013,二价锰盐还原KMnO4合成锰矿物及其影响因素研究[J].岩石矿物学杂志,32(3):393~400. MA Ge, LIU Fan, HUANG Li, SUN Meng-meng,2013,The process and influence factors of the synthesis of manganese minerals by the reactions between KMnO4 and bivalent manganese salts[J]. Acta Petrologica et Mineralogica,32(3):393~400.

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  • 收稿日期:2013-01-22
  • 最后修改日期:2013-03-19
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