Glass forming compound and brick made therewith
AssigneeRefratechnik GmbH
InventorsPeter Bartha, Alexander Tutsek
Life of this patent
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Abstract
A glass forming compound having in its melted glass phase the formula Si.sub.2 AlO (PO.sub.4).sub.3 or 4 SiO.sub.2.Al.sub.2 O.sub.3.3P.sub.2 O.sub.5 is provided together with grain mixtures for producing refractory thermally insulating bricks adapted for use in the preheating zone of a rotary cement kiln operating in an atmosphere containing alkali chlorides, particularly KCl. The bricks develop a glass layer on the kiln exposed face thereof which resists penetration by alkalis, particularly KCl.
Claims5
A grain mixture for producing refractory thermally insulating bricks, adapted for the preheating zone of a rotary cement kiln operating in an atmosphere containing KCl, characterized in that the fine portion thereof has a grain size of not greater than about 0.09 mm and consists of at least about 10 percent by weight of a grain mixture, the individual components of which lie within a region defined by a triangle A-B-C with the following boundary compositions:
- A=10.5 percent by weight of Al.sub.2 O.sub.3, 84.5 percent by weight of SiO.sub.2, 5 percent by weight of P.sub.2 O.sub.5 ;
- B=28.6 percent by weight of Al.sub.2 O.sub.3, 66.4 percent by weight of SiO.sub.2, 5 percent by weight of P.sub.2 O.sub.5 ;
- C=14.00 percent by weight of Al.sub.2 O.sub.3, 32.93 percent by weight of SiO.sub.2, 53.02 percent by weight of P.sub.2 O.sub.5 (corresponding to Si.sub.2 AlO (PO.sub.4).sub.3), and in the remaining portion of fire clay and bonding clay;
- and that the medium and coarse grain portions thereof each consist of composition of the SiO.sub.2 -Al.sub.2 O.sub.3 system and said medium and said coarse grain portions have an Al.sub.2 O.sub.3 content which ranges from about 10 to 30 weight percent.
Dependencies are inferred from the claim text.