Extraction of Potash from Felspar, Part V: Bricks from Felspar Sludge

Abstract

AbstractThe paper deals with the utilization of the sludge left after the recovery of potash from felspar for the purpose of making good quality bricks. The sludge from the dry method of the potash recovery contains inert silicates produced at high temperature and gypsum, which adversely affect the bonds in the bricks, and yields bricks of comparatively low strength. The sludge of the digestion process is suitable for making bricks having high compressive strength, nearly ten times that of ordinary clay bricks. Purer the lime used greater is the strength of the bricks. The process provides a method for utilizing felspar cheaply and extensively available in the country for producing potash, a valuable chemical and fertilizer, and bricks of high compressive strength. Preliminary cost estimate indicates, that the process is commercially feasible.