| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of regenerating an arsenic-containing mineral acid by which arsenic is efficiently removed from the mineral acid containing poor arsenic of≤1,000 ppm and the mineral acid is regenerated and effectively recycled. SOLUTION: In the method of regenerating the mineral acid by removing arsenic from the mineral acid containing poor arsenic, the regenerated mineral acid is obtained by bringing the arsenic-containing mineral acid into contact with hydrogen sulfide gas in the presence of a solid sulfide and/or sulfur to convert arsenic to solid arsenic sulfide and removing the solid arsenic sulfide by a solid-liquid separation means. COPYRIGHT: (C)2005,JPO&NCIPI
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