PROCEDEU PENTRU REDUCEREA SI INLOCUIREA PIERDERILOR DE HIDROXID DE SODIU, LAFABRICAREA ALUMINEI PRIN PROCEDEUL BAYER

摘要

1436261 Reducing NaOH loss in Bayer process ALUTERY ALUMIMUMIPARI TERVEZO VALLALAT and FEMIPARI KUTATO INTEZET 18 May 1973 23900/73 Heading C1A A method of reducing the loss of NaOH during alumina production according to the Bayer process wherein NaCl is added to the digestion liquor such that a concentration of 1-40 g./l., preferably 5-20 g./l. is maintained therein. The addition of NaCl is preferably continuous NaCl may also be added to recycling digestion liquor after addition of NaOH to bring NaOH concentration to 250-500 g./l. to NaCl concentration of 20-80 g./l. to salt out Na 2 .CO 3 .