Abstract: A process for treating electric furnace dust comprising mixing electric furnace dust and a reducing agent with a material for reducing the slag melting point, preheating the mixture, adding the preheated mixture to molten slag which is being subjected to bubbling using oxygen-containing gas, heating the whole mixture, collecting volatilized material, and cooling the remainder.

Abstract: A process for making a binder from steelmaking slag. About 5-30 wt. % of a reforming agent selected from the group consisting of silicate rock, mineral, calamine, glass waste, foundry waste sand, waste brick, red mud, volcanic spouting matter, blast furnace slag, desilica slag, iron oxide and mixtures thereof is added to a molten steelmaking slag, causing a molten reaction forming a reacted steelmaking slag. The reacted steelmaking slag is rapidly cooled to form a powder. Iron is removed from the powder and the powder is then mixed with from about 3-5 wt. % of a powder selected from the group consisting of lime, plaster, cement and mixtures thereof, which can then be used as a binder for pellets or briquettes.

Abstract: A process for making a hardening agent for weak soil or sludge from steelmaking slag. About 5-30 wt. % of specified reforming agent selected from the group consisting of one or more of silicate rock, mineral, calamine, glass waste, foundry waste sand, waste brick, red mud, volcanic slag, iron oxide and mixtures thereof is added to a molten steelmaking slag, causing a reaction forming a reacted steelmaking slag. The reacted steelmaking slag is then rapidly cooled to form a powder. Iron is then removed from the powder and the powder is then mixed with from about 3-5% of a powder selected from the group consisting of one or more of lime, plaster and cement to form a hardening agent for weak soil or sludge.