Process for treating spent potlining containing inorganic matter

摘要

PCT No. PCT/AU95/00671 Sec. 371 Date Jun. 4, 1997 Sec. 102(e) Date Jun. 4, 1997 PCT Filed Oct. 12, 1995 PCT Pub. No. WO96/11756 PCT Pub. Date Apr. 25, 1996The present invention relates to a process for reducing and/or removing inorganic matter from a material containing inorganic matter which comprises the steps of: (i) (a) treating the material with a source of hydrogen fluoride so as to form a first residue and a first solution containing inorganic matter; (b) separating the first residue from the first solution containing the inorganic matter; (c) treating the first residue with an acid so as to form a second residue and a second solution containing further inorganic matter; and (d) separating the second residue from the second solution containing the further inorganic matter; or (ii) (a) treating the material with an acid so as to form a first residue and a first solution containing inorganic matter; (b) separating the first residue from the first solution containing the inorganic matter; (c) treating the first residue with a source of hydrogen fluoride so as to form a second residue and a second solution containing further inorganic matter; and (d) separating the second residue from the second solution containing the further inorganic matter.