Classifying – separating – and assorting solids – Fluid suspension – Liquid
Reexamination Certificate
2007-12-25
2007-12-25
Lithgow, Thomas M. (Department: 1724)
Classifying, separating, and assorting solids
Fluid suspension
Liquid
C252S061000
Reexamination Certificate
active
09959038
ABSTRACT:
The present invention relates to a froth flotation process in which silicates are separated from an iron ore in the presence of a collector containing a quaternary ammonium compound having the formula R1R1N+R3R41/z Xz−(I), in which the groups R1independently are hydrocarbon groups, preferably aliphatic groups containing 6-14 carbon atoms and/or the group R2—(OR7)m—OR8—, where the groups R2independently are acyl groups containing 6-14 carbon atoms, the groups R7independently are alkylene groups containing 2-4 carbon atoms, the groups R8independently are alkylene groups containing 2-3 carbon atoms and m is a number from 0-5, R3and R4independently are alkyl groups containing 1-4 carbon atoms or groups (R5O)pH, where the groups R5independently are alkylene groups having 2-4 carbon atoms and p is a number from 1-4, X is an anionic group, and z is the charge of the anion X. This collector has a high selectivity to concentrate silicates in the froth product, while a high yield of iron minerals is maintained in the bottom concentrate or concentrates.
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Gustafsson Jan Olof
Klingberg Anders
Svensson Magnus
Akzo Nobel N.V.
Burke Michelle J.
Lithgow Thomas M.
Mancini Ralph J.
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