Process for using steelmaking slag
AssigneeNippon Magnetic Dressing Co., Ltd.
InventorsMasao Tomari, Jutaro Yoshimori
Life of this patent
Estimating the term…
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.
Claims14
A process for making a binder from steelmaking slag, comprising:
- adding a reforming agent selected from the group consisting of silicate rock, calamine, glass waste, foundry waste sand, waste brick, red mud, volcanic spouting matter, blast furnace slag, desilica slag, iron oxide and mixtures thereof to a molten steelmaking slag in an amount ranging from about 5 to about 30% by weight of the molten steelmaking slag to lower the melting point and viscosity of the steelmaking slag and to produce a molten reaction forming a reacted steelmaking slag;
- rapidly cooling the reacted steelmaking slag to form a powder composed mainly of glass comprising 2CaO.SiO.sub.2 and 2CaO.MgO.2SiO.sub.2,
- removing iron from the powder;
- finely grinding the powder to a brain value greater than 3200 cm.sup.2 /g;
- and then
- mixing the finely-ground powder with from about 3 to about 5% by weight of the powder of an agent selected from the group consisting of lime, plaster, cement and mixtures thereof as a binder to form pellets or briquettes.
A binder composition for pellets or briquettes, comprising
- a powder ground to a brain value of greater than 3200 cm.sup.2 /g, said powder comprising glass formed by rapidly cooling the reaction product of molten steelmaking slag and about 5 to about 30% by weight of the steelmaking slag of a reforming agent selected from the group consisting of silicate rock, calamine, glass waste, foundry waste sand, waste brick, red mud, volcanic spouting matter, blast furnace slag, desilica slag, iron oxide and mixtures thereof, from which iron has been removed, said reaction product comprising 2CaO.SiO.sub.2 and 2CaO.MgO.2SiO.sub.2, and about 3 to about 5% by weight of the powder of an agent selected from the group consisting of lime, plaster, cement and mixtures thereof.
Dependencies are inferred from the claim text.