Elution property of arsenic and lead from copper slag was investigated. The results obtained are follows. 1. Elution concentration of arsenic from copper slag decreased with increasing silica content in the slag, even though, it increased with increasing lime content in the slag. Elution of arsenic from the slag may be attributed to the network structure of silica. 2. Heat treatment of the slag at 500〜700℃ in the air atmosphere decreased elution concentration of arsenic. Although, elution concentration of arsenic increased extremely by heat treatment over 900℃. 3. Melting treatment of the slag with additional silica decreased elution concentration of lead as well as arsenic, even though, melting treatment with additional lime increased elution concentration of lead. 4. Heat treatment of the slag in the air atmosphere decreased elution amount of arsenic and lead in the elution test by 1N HCl solution. Decreasing in the elution amount of these heavy metals by heat treatment may be attributed to change of micro structure of the slag surface.
