真空铝热还原法制备金属锶工艺研究

Study on Preparation’Technology of Strontium by Vacuum Aluminothermy Reduction

中文关键词:  真空铝热  金属锶  工艺

英文关键词:Vacuum aluminothermy reduction  Metal strontium  Process

中文摘要:

      采用真空铝热还原法制备了金属锶,金属锶纯度可达98％～99％.通过XRD和XRFF分析渣相,其主要成分为SrO·Al2O3.研究了还原温度、保温时间、制团压力、铝粉过量系数、CaF2加入量对锶还原率的影响,获得最佳工艺参数,即真空度0～100 Pa,铝粉过量20％,制团压力20 MPa,还原温度1200～1250℃,保温3h,CaF2加入量3％.在最佳工艺条件下锶还原率可达80％左右.

英文摘要:

      Prepared metal strontium by vacuum alnminothermy reduction,the purity of the metal strontium can be 98~99%.Through a nalysis residue phase by XRD and XRF,the main components of residue phase are SrO Al2O3.Studied the impact of reduction temperature,holding time,briquetting pressure,aluminum excess coefficient,reaction calcium fluoride dosage and strontium reduction rate of SrO,we got the optimum process parameters,namely vacuum 0~100 Pa,the aluminum excess 20%,briquetting pressure 20 MPa,the reduction temperature of 1 200 to 1 250 ℃,insulation 3 hours,CaF2 amount of 3%.In optimum conditions,the strontium reduction rate of SrO can be up to 80%.