六偏磷酸钠对碳酸钙矿化的影响  

Research on crystal morphology and shape of CaCO_3 adjusted by sodium hexametaphosphate

作　　者：吴刚[1] 章守权[1] 葛秀涛[1] 吴霖生[1] 

机构地区：[1]滁州学院材料与化学工程学院,安徽滁州239012

出　　处：《化学研究与应用》2012年第12期1853-1856,共4页Chemical Research and Application

基　　金：安徽省应用化学重点建设学科(教高200802187C);安徽省化学工程与工艺教学团队(教高20101035)

摘　　要：常温下,在CaCl2与NaCO3反应体系中加入一定量的六偏磷酸钠调控合成CaCO3晶体,用粉末XRD衍射仪、FT-IR对合成的晶体进行了表征,用扫描电子显微镜观察分析了生成的CaCO3晶体的形貌,研究了六偏磷酸钠浓度对CaCO3晶型和形状的影响。研究表明:在水体系中,CaCl2与NaCO3反应生成CaCO3晶体,当加入六偏磷酸钠的量小于50mg时,得到的是纯的方解石晶型,当加入六偏磷酸钠的量大于80mg时,得到的是方解石和球霰石的混合体,随着六偏磷酸钠量的增加,生成的球霰石晶体增多,实验结果说明六偏磷酸钠对球霰石晶体有一定的稳定作用。Under atmospheric temperature and room temperature,a certain amount of sodium hexametaphosphate was added into the solution of 0. 5 mol/L sodium carbonate, then 0. 5 mol/L calcium chloride was added into the mixture solution with stirring. The products were characterized by X-ray diffraction and FT-IR spectroscopy. The shape was observed by scanning electron microsco- py. The results indicated that sodium hexametaphosphate played important roles in the morphology and polymorph of calcium carbonate. With the concentration increasing of sodium hexametaphosphate, mixture crystals with globule-like shape of vaterite were ob- tained in addition to cube-like calcite. This result suggests that sodium hexametaphosphate can stabilize vaterite crystals.

关 键 词：六偏磷酸钠 方解石 球霰石 碳酸钙 

分 类 号：O611.4[理学—无机化学]