-1-第45卷第6期非金属矿Vol.45No.62022年11月Non-MetallicMinesNovember,2022稀土石膏制备硫酸钙晶须及晶须形成机理吴锦绣*秦思成牛小超齐源昊柳召刚胡艳宏冯福山李健飞(内蒙古科技大学材料与冶金学院，内蒙古自治区高校稀土现代冶金新技术与应用重点实验室，内蒙古包头014010)摘要为解决稀土冶金过程中产生的废渣回收利用问题，以稀土石膏为原料制备硫酸钙晶须(CSW)。通过扫描电镜（SEM）、X射线衍射（XRD）和热重-差示扫描量热（TG-DSC）等对样品进表征，研究晶须生长时间和钙离子浓度对CSW形貌的影响。结果表明，CSW的生长基本经历成核-轴向生长-溶解-纵向生长。其生长机理主要是轴向螺旋位错和层-层自组装生长方式。陈化时间为1.5h，晶须生长完全。钙离子浓度越高越有助于晶核形成，从而对CSW的形成过程起到强化作用，促进其快速生长。关键词稀土石膏；微波法；硫酸钙晶须；长径比；生长机理中图分类号：TF845；X75文献标志码：A文章编号：1000-8098(2022)06-0001-05PreparationofCalciumSulfateWhiskersfromRareEarthGypsumandFormationMechanismofWhiskersWuJinxiu*QinSichenNiuXiaochaoQiYuanhaoLiuZhaogangHuYanhongFengFushanLiJianfei（KeyLaboratoryofInnerMongoliaAutonomousUniversityonNewTechnologiesofModernMetallurgyandApplicationofRareEarth,MinistryofEducation,SchoolofMaterialsandMetallurgy,InnerMongoliaUniversityofScienceandTechnology,Baotou,InnerMongolia014010）AbstractForthepurposeofsolvingtheproblemofwasteresiduerecyclinginrareearthmetallurgyprocess,calciumsulfatewhisker(CSW)waspreparedwithrareearthgypsumasrawmaterial.TheeffectsofwhiskergrowthtimeandcalciumionconcentrationonthemorphologyofCSWwerestudiedbymeansofSEM,XRDandTG-DSC.TheresultsshowthatthegrowthofCSWbasicallyundergoesnucleation-axialgrowth-dissolu-tion-longitudinalgrowth.Thegrowthmechanismismainlyaxialspiraldislocationandlayer-layerself-assembly.Whentheagingtimeis1.5h,thewhiskersgrowcompletely.Thehighertheconcentrationofcalciumions,themoreconducivetotheformationofcrystalnucleus,thusstrengthenstheformationprocessofCSWandpromotesitsrapidgrowth.Keywordsrareearthgypsum;microwavemethod;calciumsulfatewhiskers;lengthtodiameterratio;formationmechanism收稿日期：2022-10-02基金项目：国...
