| 摘要 |
<p>The invention discloses a process for the treatment of run-of-mine kaolin feed material. The kaolin feed material is subjected to a de-gritting step whereby quartz grit and any other solid aggregates are removed from the kaolin feed material to produce kaolin. Thereafter, in a leaching step, the kaolin is leached with hydrochloric acid to produce a residue, which contains silica, and a leachate, which contains aluminium chloride salt. Subsequently the aluminium chloride salt is precipitated from the leachate and subjected to a calcination step wherein the aluminium chloride salt is formed into alumina. Figure 1 12 14 16 2610 I > IAZ N 32 30< W~s' ~Pxt&34 ---- ------ - rA~ ga -J8 rcc i1 .s-C4 Figure 2 12 14 16 26 100 !: Itlenite 18 Cr0 ~removal Omf oC ---- --- -- ------ 52 , F Gr, Zrd rrdrct -- --- ---- 22... -~ .. -) 32 2 2 c kj Pre heated J 40 -1advro 50 tPrier ----oio -~ . - v T--------- 38 - - - - - - -- - --- - - -(Fitter' ------ 44taatv for------- Aerd Recory 36 . ----- reevahrrtro ard T4- ----- t- rR~crer46 .. ...- ------ 'Alvrrr'a rovey 48 Aluminra wavi~er . Alrrrva dryer - -*cl 1 -t~n -------------</p> |
