PRODUCTION OF LOW ALPHA RAY LEAD

摘要

PROBLEM TO BE SOLVED: To provide a process for producing lowαray lead havingαray quantity of 0.1cph/cm<2> or below. SOLUTION: An a ray quantify by<210> Po collapse in lead concentrate is measured and the lead concentrate of which theαray quantity by the<210> Po collapse is smaller than a reference value 380(dpm/1kg lead content) is selected. The lead concentrate of which theαray quantity is smaller than the reference value 380(dpm/1kg lead content) is heated and melted together with an alkaline metal salt and a reducing agent in a nonoxidative atmosphere to cause the reduction decomposition of the alkaline metal salt, by which the desulfurization reduction of the lead concentrate is executed and the lead is produced. The resulted lead is used as anode and is subjected to electrolytic refining by using an electrolyte contg. aulfamic acid.