Purification of refractory rare metals

难熔稀有金属的提纯

基本信息

批准号：
05650726
负责人：
TSUKIHASHI Fumitaka
金额：
$ 1.47万
依托单位：
THE UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

The thermodynamic properties of calcium-calcium halide fluxes were measured. The removal behavior of tramp elements from molten metals were discussed based on the observed results.The activities of calcium in the CaO_<satd>. -Ca-MF_2 (M : Ca, Ba, Mg) and CaO_<satd>. -Ca-NaF systems were measured as a function of calcium composition between 1373 and 1573K by equilibrating these fluxes with solid zirconium plate in a CaO crucible.The CaO_<satd>. -Ca-CaF_2 is saturated with CaF_2 at X_<Ca>/ [X_<Ca>+X_<CaF2>] =0.80 and the activity of Ca is 0.77. The activity of Ca in the CaO_<satd>. -Ca-CaCl_2 flux is smaller than that in the CaO_<satd>. -Ca-CaF_2 flux. The CaO_<satd>. -Ca-BaF_2 is saturated with BaF_2 at X_<Ca>/ [X_<Ca>+X_<BaF2>] =0.66. The activity of Ca in the CaO_<satd>. -Ca-MgF_2 is 0.14 at X_<Ca>/ [X_<Ca>+X_<MgF2>] =0.50. The CaO_<satd>. -Ca-SrF_2 is saturated with SrF_2 at X_<Ca>/ [X_<Ca>+X_<BaF2>] =0.15 and the activity of Ca is 0.04. The activity of Ca in the CaO_<satd>. -Ca-NaF is 0.48 at X_<Ca>/ [X_<Ca>+X_<NaF>] =0.60.The contents of tramp elements such as antimony, arsenic, bismuth, lead and tin of molten carbon saturated iron were estimated by using the observed data of calcium activity in these fluxes. Content of each tramp element was estimated to be smaller than 10^<-4> mass%. Therefore, the removal of tramp elements such as tin, arsenic, antimony, bismuth and lead from molten rare metals by using calcium-metal fluoride fluxes may be possible.

测量了卤化钙通量的热力学特性。根据观察到的结果讨论了熔融金属中流浪元素的去除行为。 -ca-mf_2（M：CA，BA，MG）和CAO_ <ASTD>。通过用固体锆板在CAO坩埚中平衡这些通量，通过在1373至1573K之间测量-CA-NAF系统作为钙组成的函数。 -ca-caf_2在x_ <ca>/ [x_ <ca>+x_ <caf2>] = 0.80的Caf_2中饱和，CA的活动为0.77。 CA <SATD>中CA的活动。 -ca-cacl_2通量小于cao_ <ASTD>中的通量。 -ca-caf_2通量。 CAO_ <SATD>。 -ca-baf_2在x_ <ca>/ [x_ <ca>+x_ <baf2>] = 0.66的baf_2中饱和。 CA <SATD>中CA的活动。 -ca-mgf_2在x_ <ca>/ [x_ <ca>+x_ <mgf2>] = 0.50处为0.14。 CAO_ <SATD>。 -ca-srf_2在x_ <ca>/ [x_ <ca>+x_ <baf2>] = 0.15时用SRF_2饱和，CA的活动为0.04。 CA <SATD>中CA的活动。 -ca-naf在x_ <ca>/ [x_ <ca>+x_ <naf>] = 0.60时为0.48。通过锑，砷，砷，鞭毛，二氧化碳，铅，铅，铅和锡的含量估算了流浪元素的内容。使用这些通量中观察到的钙活性数据。估计每个流浪汉元素的含量小于10^<-4>质量％。因此，可以通过使用金属氟化物通量去除锡，砷，锑，二氧化碳，以及从熔融稀有金属中去除流浪汉元素。