Improvements of hydrometallurgical flowsheet in soda-lime sintering process

This paper proposes that pregnant liquor from sinter leaching in soda-lime sintering process is subjected to carbonization and thus obtained raw Al(OH)(3)(high silica content) is processed with very simple Bayer process. With this new technology, sandy alumina with high quality is produced in sintering process; the amount of recycling alumina in process decreases by about 180kg/t-Al2O3; the amount of sinter decreases by about 0.5t/t- Al2O3;process control is easier than before;the consumption of CO2 gas for carbonization increases by 3.65% only; the operation cost of inserted simple Bayer process is compensated completely by the cost of current desilication operation which is canceled in new technology. New technology can decrease production cost by 82.87yuan/t- Al2O3 and increase output of alumina by 75Kt/year.