Elution property of lead from granulated copper slag and synthesized slag was investigated. The conditions obtained from slag test were applied to the fly ash from waste incinerator in order to minimize the elution of lead. The results obtained are follows.
1. Elution concentration of lead from copper slag has no relation with lead content in the slag, and it has strong relation with silica content in the slag. Elution concentration of lead decreased with increasing silica content in the slag, even though, elution concentration of lead was relatively high from the slag containing lime in high concentration.
2. Elution concentration of lead from synthesized slag also has strong relation with silica content in the slag. Elution concentration of lead decreased with increasing silica content in the slag, and it clear the Japanese environment standard (0.01 ppm) at the silica content over 40 wt%. Elution of lead from slag may be attributed to the network structure of silica. Heat treatment of slag decreased elution of lead extremely attributed to crystallization.
3. Melting treatment of incinerator fly ash is not always decreasing elution of lead from the material. Although, melting incinerator fly ash with additional silica decreased elution of lead. Elution of lead from incinerator fly ash slag decreased extremely by heat treatment.
