GB190124683A - Improvements in or relating to Cements or Plasters, and in the Manufacture of Bricks, Tiles, Slabs, Artificial Stone, Electric Insulating Compositions, and the like. - Google Patents

Abstract

24,683. Berry, G. F., and Lawes & Co., J. B. Dec. 4. Bricks, slabs, tiles, &c.-Relates to improvements in cements, mortars, or plasters, and in the adaptation of the same in the manufacture of bricks, tiles, slabs, artificial stone, &c. and as electric insulating-compositions. In the manufacture of cements &c., the crude calcium sulphate precipitated during the manufacture of tartaric, citric, carbonic, and other acids is employed, and also the clinker and ashes resulting from combustion in gas generators or producers, or forced draught, reverberatory, and other furnaces. The calcium sulphate is dried by means of waste heat from the open kilns in which it is subsequently dehydrated. The kilns are heated by the products of combustion from gas producers or furnaces, the temperature not exceeding 340‹ F. To produce Keene's cement, the dehydrated gypsum is steeped in, or sprinkled with, a 6 to 10 per cent solution of alum or borax, and is then re-calcined, cooled, and ground. To produce hydraulic lime, it is ground together with blast-furnace clinkers or ashes, calcined limestone, and quicklime. To produce Portland cement, the aforesaid hydraulic lime is mixed with cement clinker, and is re-calcined, cooled, and ground. The Portland cement so prepared may be mixed with sand and moulded into bricks, tiles, slabs, or artificial stone ornaments or decorations, which are dried slowly in the air. Resin or pitch may be added to the mixture of Portland cement and sand, the mixture being rendered plastic, either by heat, or by means of a volatile solvent. This composition is suitable for switchboard bases, and for other electric insulating purposes.