PRODUCTION OF LOW ALPHA-RAY BARIUM HYDROXIDE AND BARIUM CARBONATE

摘要

PROBLEM TO BE SOLVED: To produce low α-ray barium hydroxide and barium carbonate having ≤0.01 cph/cm²α-dose. ;SOLUTION: Barite as a raw ore is crushed in a lump shape and pulverized. The resultant fine ore is subjected to flotation to remove the country rock and gangue. The resultant concentrate is reduced with carbon to produce barium sulfide. This barium sulfide is converted into barium chloride by dissolution in hydrochloric acid and recrystallization is carried out. Dissolution and recrystallization are repeated and strontium and calcium are deposited and removed by utilizing the fact that barium chloride, strontium chloride and calcium chloride are different from one another in solubility to water. Barium chloride purified by the removal is caustified to produce barium hydroxide and barium carbonate. In this case, the α-dose of the crushed ore is measured and the low α-dose part of the ore emitting ≤1 cph/cm²α-rays is selected and pulverized.;COPYRIGHT: (C)1999,JPO