Abstract
Abstract Porous pellets for immobilizing heavy metals were manufactured from coal tailings and iron oxide powder. Coal tailings waspulverized and mixed with iron oxide powder. The mixed powder was granulated into spherical pellets and roasted. Over 1100 o C,residual coal in coal tailings reduced iron oxide to ZVI(Zero-Valent Iron). The pellets have 34.63% of porosity, 1.31 g/mL ofbulk density, and 9.82 µ m median pore diameter. The pellets were reacted with synthetic solutions containing each heavy metals:arsenic(V), copper(II), chrome(VI), and cadmium(II), respectively. On the test of immobilizing heavy metal, the pellets madeat 1100 o C were superior to the other pellets made under 1000C. Immobilizing over 99.9% of 10ppm heavy metal solutionsrequired 1 hour for arsenic, 2 hours for chrome, and 4 hours for copper. However, immobilizing capacity of cadmium was infe-rior to that of the other metals and it was decreased in reversely proportion to initial concentration of the solutions. Key words: Coal tailings, Iron oxide, Immobilization, Heavy metals
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