B - Operations – Transporting – 09 – B
Patent
B - Operations, Transporting
09
B
B09B 3/00 (2006.01) C01D 7/00 (2006.01) C01F 11/22 (2006.01) C22B 7/00 (2006.01) C22B 21/00 (2006.01) C25C 3/08 (2006.01) A62D 3/00 (2006.01)
Patent
CA 2118943
A process for treatment of a solid material containing fluoride and sodium, such as spent pot-lining from aluminium reduction cells, comprising the following steps: I) contacting the solid material (10) with recycled caustic liquor (14) and source of calcium (12) is a digestor (1); 2) passing the mixture to a separating device (2) to separate into liquid (18) and solid fraction (16); 3) recycling part of the liquid fraction (20, 14) containing caustic concentration of 75-200 g/l, calculated as Na2 CO3 to step (1)and 4) recovering concentrated caustic liquor (22) of concentration 180-300 g/l from liquid fraction (18). The product of the process is a solid residue having low levels of leachable fluoride and a concentrated caustic liquor.
Kidd Ian Lewis
Rodda Darren Paul
Wellwood Grant Ashley
Comalco Aluminium Limited
Oyen Wiggs Green & Mutala Llp
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