| 摘要 |
PROBLEM TO BE SOLVED: To deposit metals contained in tuff or the like on the surface of the stone by using an acid to obtain deposits, the depositing solution, and the stone to which deposits stick as a purifying agent for a heavy metal-containing solution. SOLUTION: (1) Green tuff, the acid, and water are mixed in the mixing process. The green tuff is desirably a fine particle having a particle size of 3 mm or less. A weak acid or a strong acid is used as the acid. The water infiltrates the porous parts of the stone to play a role in carrying the acid into the stone and a role in moving iron and other metal ions eluted from the inside of the stone to the surface thereof, (2) The mixed sample is sufficiently reacted in the standing process. (3) Unreacted remaining acid is removed in the washing process. (4) Compounds containing metals, mainly iron, deposited on the surface of the green tuff are removed efficiently, and collected efficiently in the ultrasonic treatment process. COPYRIGHT: (C)2009,JPO&INPIT
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