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叙述复矿中U的快速测定法,这些复矿在HCl和HNO_3的存在下生成水解产物,粘着在Pt容器上。称取含U_3O_8约0.01克的矿样,置Pt碟中,在水浴上用10毫升40％-HF使其崩解。若不能完全崩解,加入3—4毫升HCl,蒸发内容物至干,然后注加10毫升40％-HF再行蒸发。于干燥的残渣上注加10毫升40％-HF并加入2克SnCl_2。将溶液在水浴上加热15分钟,并在室温静置18小时。U即析成UF_4沉淀,其中杂有稀土金属和碱土金属的氟化物,但并不干扰以后的滴定。将沉淀滤在塑料漏斗上,用稀HF
Describe the rapid determination of U in the complex ore, which produces hydrolysates in the presence of HCl and HNO 3, adhering to the Pt vessel. Weigh about 0.01 g containing U_3O_8 mineral sample placed Pt dish, in a water bath with 10 ml of 40% -HF make it disintegrate. If it does not disintegrate completely, add 3-4 ml of HCl, evaporate the contents to dry, then add 10 ml of 40% -HF and evaporate again. To the dried residue was added 10 mL of 40% -HF and 2 g of SnCl 2 was added. The solution was heated in a water bath for 15 minutes and left to stand at room temperature for 18 hours. U that is precipitated UF4 precipitation, which is mixed with rare earth metals and alkaline earth metal fluoride, but does not interfere with the subsequent titration. The precipitate was filtered on a plastic funnel and diluted with HF