C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
C09C 3/00 (2006.01) C09C 1/00 (2006.01) C09D 5/08 (2006.01) C09D 7/12 (2006.01) C22B 7/00 (2006.01) C22B 7/02 (2006.01) C22B 19/30 (2006.01)
Patent
CA 2228562
A method for preparing inorganic pigments from steel mill dust, particularly electric steel mill dust, wherein (a) the dust is separated into a magnetic fraction and a non-magnetic fraction; (b) the non-magnetic fraction is subjected to a basic leaching reaction; (c) the resulting solid batch is rinsed until neutralised and then separated; (d) the resulting batch is calcined at 450-650 ~C; (e) the calcined batch is treated with sulphuric acid in the presence of a catalyst; (f) the inorganic pigments are recovered; and (g) the solutions from (c) and (e) are used to precipitate other pigments.
L'invention concerne un procédé de préparation de pigments minéraux à partir de poussières d'aciéries, notamment électriques, caractérisé en ce qu'il comprend les étapes selon lesquelles: a) on sépare les poussières en deux fractions magnétique et non magnétique; b) on soumet ladite fraction non magnétique à une réaction de lixiviation basique; c) on rince jusqu'à la neutralisation et on sépare la charge solide ainsi obtenue; d) on calcine à une température comprise entre 450 et 650 ·C la charge ainsi obtenue; e) on traite la charge calcinée à l'acide sulfurique en présence d'un catalyseur; f) on recueille les pigments minéraux; g) on utilise les solutions issues de c) et e) pour précipiter d'autres pigments.
Roux Gilles
Tedjar Farouk
Bereskin & Parr
Recupac
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