C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 5/06 (2006.01) C21B 3/06 (2006.01) C21B 5/02 (2006.01) C21B 5/04 (2006.01) C21C 5/36 (2006.01)
Patent
CA 2398341
In a method for producing puzzolanic or hydraulic grinding additives for the cement industry from basic oxidic slags, in particular steel slags, using a metal bath for the reduction of metal oxides contained in the slags, the basicities of the liquid slags are adjusted to values lying 0.1 to 0.5 below the basicity value (CaO/SiO2) of the target slag prior to the reduction by adding acidic corrective substances such as, e.g., quartz sand and/or blast furnace slag and/or SiO2- containing corrective substances.
La présente invention concerne un procédé de production de matières de broyage puzzolaniques ou hydrauliques, destinées à l'industrie du ciment, à partir de scories oxydiques basiques, notamment de scories d'acier, par utilisation d'un bain métallique qui permet de réduire les oxydes métalliques des scories. Selon ce procédé, la basicité des scories fluides est ajustée à une certaine valeur, avant la réduction, par addition de matières de correction acides, telles que du sable siliceux et/ou une scorie du haut fourneau et/ou une matière contenant SiO2. Cette valeur se situe de 0,1 à 0,5 en-dessous de la valeur de basicité (CaO/SiO2) de la scorie cible.
Holcim Ltd.
Holcim Technology Ltd.
Marks & Clerk
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