Building elements, esp. bricks - are made from waste obtd. in burning coal and in roasting materials contg. magnesium carbonate

摘要

A mixt. is made contg. by wt. at least 20% of decarbonised MgCO3; and at least 50% of a raw material in which the silica and alumina total at least 50%. The mixt. is pressed into bricks, which are exposed to superheated steam. The pref. mixt. contains waste prods. obtd. by the thermal treatment of raw material contg. MgCO3, and by the combustion of coal. Inexpensive waste prods. can be used instead of high grade lime, sand and dolomite. Bricks are obtd. witb similar properties to those of sand-lime bricks.