MATERIAL FOR DISPOSING OF HEAVY METAL

PROBLEM TO BE SOLVED: To solve the problems aeration for a long time and a large amount of calcium carbonate are required for oxidizing trivalent arsenic to pentavalent arsenic and a material capable of adsorbing or ion-exchanging trivalent arsenic and hexavalent chromium is not abundant and the amount of the material to be added is in an increasing tendency, in a hydroxide-iron coprecipitation method which is inexpensive and mostly used for disposing of trivalent arsenic typically contained in mining wastewater. SOLUTION: A material for disposing of heavy metal is made by using a product made by carbonizing paper sludge generated in recycling waste paper, in which a coating material of the waste paper contained in the sludge such as kaolin clay, calcium carbonate and talc are activated in a carbonizing process. Iron oxide, titanium oxide and a functional group of a non-carbonized compound that are trapped in a pore adsorb the heavy metal including trivalent arsenic. A material for disposing of heavy metal is made by further adding/mixing fine apatite to/with the above material for disposing of heavy metal, and because the apatite also has an adsorption effect for the trivalent arsenic, 99% of the trivalent arsenic can be added by an addition of 3% (by weight) by the stepwise addition of the material. COPYRIGHT: (C)2006,JPO&NCIPI