The long-term acid neutralizing capacity of steel slag

• The long-term acid neutralizing capacity (ANC) of the electric are furnace slag investigated by batch pH titration, and the neutralizing processes of the slag were evaluated by reaction path modeling. Reaction time plays an important role for the determination of the ANC for the steel slag. The relatively slow reactions may give large contributions to the ANC for a long-term leaching process, pH-dependent reactivities of the steel slag were found in the high pH range. The neutralizing rates at high pH were much slower than that at relatively low pH. Below pH 9, the reaction rates became less pH-dependent and usually fast. The features of neutralizing reactions of the slag may be explained by its mineralogical composition and dissolution kinetics in the neutralizing processes.

Nyckelord

leaching processes

acid neutralization

steel slag

geochemical simulation

incinerator bottom ash

solid-waste

behavior

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)