GB190205710A - Improvements in the Manufacture of Artificial Stone or Brick and the Preparation of Lime therefor - Google Patents

Abstract

5710. Anderson, O. H. March 7. Bricks.-Relates to the manufacture of artificial stone or brick, and to the slaking of lime therefor. To a dry mixture of about 95 per cent. of sand and 5 per cent. of slaked and dried lime is added a sufficient quantity of water to enable the mass to be moulded into bricks or blocks. The blocks are hardened in a suitable chamber by the action of steam at about 100 lb. pressure, excessive humidity being thus avoided. A sufficient quantity of lime for preparing a fresh batch of blocks is slaked in the chamber simultaneously with the hardening- process ; the slaking taking place entirely through the action of the steam and of the moisture which it absorbs or removes from the blocks. Dry pul- verulent slaked lime is thus produced, which may be sifted or passed through a pulverizer before use. Superheated steam may be introduced into the chamber after the action of the high-pressure steam is complete. Blocks may also be produced from sand mixed with lime which has been slaked, mixed with nearly twice its weight of sand, and heated to redness ; diluted hydrochloric acid is substituted for the water employed in the moulding-process.