| 摘要 |
PURPOSE:To produce a purified iodine product of high purity by economically separating, recovering and purifying expensive iodine from various waste liquors from production processes containing iodine and/or an inorganic iodine compound in high yield. CONSTITUTION:A waste liquor containing iodine and/or an inorganic iodine compound is oxidized or reduced and the produced free iodine molecules are then adsorbed on a strong basic anion exchange resin adsorbing iodide ions under acidic conditions to separate the iodine from inorganic salts or organic substances such as organic solvents, etc., contained in the waste liquor. The resin is then sufficiently washed with tap water, etc., then made to react with the iodine molecules adsorbed on at least one of a sodium bisulfite, a sodium sulfite and a sodium hydroxide solutions, eluted and separated as a solution of hydriodic acid. The oxidized and liberated iodine is subsequently purified by a well-known pressuring melting method to produce the purified iodine product. |
