Thermal stabilization of steelmaking slag

Details Thermal stabilization of steelmaking slag Thermal stabilization of steelmaking slag

C - Chemistry, Metallurgy

01

F

C01F 11/18 (2006.01) C04B 5/00 (2006.01) C04B 7/147 (2006.01) C21C 5/36 (2006.01) C21C 5/54 (2006.01) C22B 7/04 (2006.01)

Patent

CA 2167334

A thermally stable steelmaking slag is produced which is suitable for use in applications requiring dimensional stability, e.g. as aggregate in road construction. Fine particles of slag obtained from a basic oxygen furnace operation or from an arc furnace operation is firstly subjected to a thermal hydration at a temperature in the range of about 100 to 400°C. Thereafter, the hydrated slag particles are carbonated in the presence of carbon dioxide at a temperature in the range of about 500 to 900°C, whereby substantially all free calcium oxide in the slag particles is converted to calcium carbonate. The product obtained is well suited for road construction and cementitious applications.

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