C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 38/02 (2006.01) C04B 14/30 (2006.01) C04B 18/14 (2006.01) C04B 22/04 (2006.01)
Patent
CA 2354967
The invention relates to a porosifying, solidification-accelerating additive for binding agent building materials, consisting of Al2O3 50 - 90 % MgO 4 - 20 % SiO2 0.5 - 15 % AlN 0.1 - 5 % Fe2O3 0.1 - 5 % CaO 0.1 - 5 % F 0.1 - 5 % Na2O 0.1 - 5 % K2O 0.1 - 2 % as well as in the form of metallic particles A1 0.1 - 10 % Si 0.1 - 3 % Fe 0.1 - 3 % balance in total up to 5 % annealing losses 0.1 - 15 % and of mineral main constituents in the form of corumdum (.alpha.-Al2O3) and spinel (MgO × Al2O3) , wherein the metallic aluminium particles are enveloped by mineral transition modifications from aluminium hydroxide (Al2O3 × 3H2O) to .alpha.-aluminium oxide, wherein the powder comprises a particle size of at least 90% smaller than 500 µm and wherein the BET surface of the powder amounts to at least 10 m2/g. Furthermore, the invention relates to a process of producing a porosifying, solidification-accelerating additive for a binding agent building material by thermally treating the powder in a flue gas flow down to a residual moisture of 2 % maximum by shock drying at flue gas temperatures of 400 to 500 °C in a drying time of less than 10 seconds, and by thermally activating the powder by partially calcinating same within a temperature range of 400 to 1,000 °C, wherein the holding time is calculated in such a way that there is obtained a BET surface of the activated powder of at least 10 m2/g, and wherein the metallic aluminium particles are enveloped by mineral transition modifications from aluminium hydroxide (Al2O3 × 3H2) to .alpha.-aluminium oxide.
Feige Reinhard
Merker Gerhard
Aluminium-Salzschlacke Aufbereitungs Gmbh
Fetherstonhaugh & Co.
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