GB307391A - Improvements in or relating to refractory building material - Google Patents

Abstract

307,391. Knudsen, G., Goldschmidt, V. M., and Knudsen, R. Sept. 3, 1927. Divided on 301,547, and addition to 260,298. Refractory substances; stone, artificial.-The process for the manufacture of refractory building material &c. consisting substantially of magnesium orthosilicate described in the parent Specification is modified by substituting for or adding to the talc, other magnesium hydrosilicates, such as serpentine, or substances containing such. These hydrosilicates or the equivalent are heated with magnesia or other substances of high magnesia content or capable of forming the same, with or without suitable reaction accelerators, to temperatures below the melting point of magnesium orthosilicate. The serpentine or the like may be first dehydrated, preferably at low temperatures. Other substances, binding agents and filling materials may be added such as granulated olevine, clay, kaolin, bauxite, and other aluminium compounds, iron ores, oxides, or other compounds such as magnetite and compounds of trivalent or tetravalent elements of high atomic weight such as titanium, chromium, manganese, vanadium, zirconium, yttrium, lanthanium, and cerium. The composition before being heated may be moulded under high pressure, rammed, cast, or applied by spraying or painting. In an example a composition comprising 100 parts of serpentine and 90 parts of impure magnesite is heated for several hours at 1300‹ C.