石英砂表面锰胶膜的合成及其影响因素研究  

A study of the synthesis of manganese cutans on the surface of quartz sand and its influencing factors

作　　者：谢坤[1] 马格[1] 黄丽[1] XIE Kun;MA Ge;HUANG Li(Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River),Ministry of Agriculture and Rural Areas,Huazhong Agricultural University,Wuhan 430070.China)

机构地区：[1]华中农业大学农业农村部长江中下游耕地保育重点实验室,湖北武汉430070

出　　处：《岩石矿物学杂志》2020年第4期495-503,共9页Acta Petrologica et Mineralogica

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

摘　　要：以石英砂为载体在其颗粒表面合成锰胶膜运用X射线衍射(XRD)和扫描电镜(SEM)等手段对胶膜中矿物的结构进行表征,探讨体系中不同锰摩尔比R(Mn2+、Mn7+摩尔比分别为1:1、1:2、1:3、1:4)、合成温度(30、50、70、90、110℃)、搅拌时间(48、72、96 h)和石英砂添加量(5、10、20、30、40 g)等因素对锰胶膜合成的影响。研究结果表明,随着R的减小,锰胶膜中的锰钾矿向水钠锰矿转化且矿物的结晶度增大,锰含量减小,晶体颗粒逐渐增大;随着温度的升高,胶膜中矿物的结晶度增大,锰含量下降,但矿物类型没有变化;搅拌不会影响胶膜的矿物类型,但搅拌时间越长胶膜中锰矿物含量越高;随石英砂添加量的增大胶膜中锰矿物类型不变,但其结晶度减弱,锰含量先降低但在石英砂添加量为10 g时开始升高。In this study,manganese cutans were synthesized on the surface of quartz sand particles.Crystal structure characteristics of the minerals in the cutans were investigated by means of X-ray diffraction(XRD)and scanning electron microscopy(SEM).The effects of mole ratio R of Mn2+:Mn7+(1:1,1:2,1:3 and 1:4 respectively),synthetic temperature(30,50,70,90 and 110℃respectively),standing and churning time(48,72 and 96 h respectively),and quartz sand amount(5,10,20,30 and 40 g respectively)on the formation of manganese oxides in the cutans were discussed.The obtained results showed that,with the decrease of R(Mn2+:Mn7+),the minerals in the manganese cutans were transformed from cryptomelane to birnessite.Moreover,the crystallinity of minerals increased,the manganese content decreased,and the granular structure increased.With the rising of synthesis temperature,the crystallinity of the mineral in the cutans increased,and the manganese content in the cutans decreased,but there was no variation of the type of the mineral.The churning did not affect the mineral type of the cutans,but the longer the stirring time,the higher the mineral content in the cutans.As the quartz added amount increased,the crystallization of the minerals was declined,and the mineral content on the surface of the cutans was reduced first and then rose when the content of quartz sand was 10 g,but the mineral type did not change.

关 键 词：锰胶膜 锰摩尔比 合成温度 搅拌时间 石英砂添加量 

分 类 号：P579[天文地球—矿物学]