Methods for Producing Alumina from Clay. Evaluation of Two Lime Sinter Processes

摘要

Two lime sinter processes for recovering alumina from clay, the double-leach process and the single-leach process, were evaluated. In both processes, clay and limestone are mixed and sintered to form calcium aluminate from which alumina is extracted as sodium aluminate by leaching with a dilute of sodium carbonate. The pregnant liquor is desilicated, then carbonated to precipitate alumina trihydrate which is recovered and calcined to alpha-alumina. (Author)