典型文献
Defluorination of bastnaesite by steam roasting process
文献摘要：
The bastnaesite was defluorinated by steam roasting process,and fluorine was removed in the form of hydrogen fluoride to realize the separation from rare earth.The effects of particle size of raw material,roasting temperature and time on defluorination rate of bastnaesite were studied.The suitable condi-tions of steam roasting process are that the particle size of raw material is less than 74 pm,the roasting temperature is 1000℃and the roasting time is 4 h.The defluorination rate of bastnaesite is close to 100％under above these conditions.When the temperature rises to 1000℃,the voids on the surface of the particles increase obviously,and there is a developed network of voids,which indicates that the fluorine oxides in bastnaesite react fully with the saturated water vapor at this stage,and a large amount of fluorine escapes in the form of hydrogen fluoride from the surface and inside of the mineral.X-ray diffraction results show that there are only rare-earth oxides in the form of Ce0.33La0.33Ca0.33O15 and Ce7O12 in the slag.The results of energy spectra and chemical analysis show that the fluorine in the baking sand was basically completely removed.
文献关键词：
中图分类号：
作者姓名：
Shuchen Sun;Ying Yang;Ganfeng Tu;Faxin Xiao
作者机构：
School of Metallurgy,Northeastern University,Shenyang 110819,China;College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China
文献出处：
引用格式：
[1]Shuchen Sun;Ying Yang;Ganfeng Tu;Faxin Xiao-.Defluorination of bastnaesite by steam roasting process)[J].稀土学报（英文版）,2022(12):1963-1968
A类：
Defluorination,defluorinated,33Ca0,33O15,Ce7O12
B类：
bastnaesite,by,steam,roasting,process,was,fluorine,removed,form,hydrogen,fluoride,realize,separation,from,rare,earth,effects,size,raw,material,temperature,defluorination,were,studied,suitable,that,less,than,pm,close,under,above,these,conditions,When,rises,voids,surface,particles,increase,obviously,there,developed,network,which,indicates,oxides,react,fully,saturated,water,vapor,this,stage,large,amount,escapes,inside,mineral,ray,diffraction,results,show,only,Ce0,33La0,slag,energy,spectra,chemical,analysis,baking,sand,basically,completely
AB值：
0.443698
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