Classifying – separating – and assorting solids – Fluid suspension – Liquid
Reexamination Certificate
2011-06-07
2011-06-07
Lithgow, Thomas M (Department: 1776)
Classifying, separating, and assorting solids
Fluid suspension
Liquid
Reexamination Certificate
active
07954643
ABSTRACT:
A derivative of aspartic acid is used as a collector for a phosphate containing mineral, such as apatite, in a froth flotation process. According to the invention the collector has a high selectivity for phosphate containing minerals even in the presence of carbonate minerals, such as calcite. The derivative has the formula (I) where RIis a hydrophobic group containing a hydrocarbon group of 6-24 carbon atoms; RIIis an alkyl group with 1-7 carbon atoms or a group of the formula (B)yH, in which B is an alkyleneoxy group with 2-4 carbon atoms and y is a number from 1 to 10; and M is a group selected from the group consisting of a cation or hydrogen. Methods for producing the derivative are also described.
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Eisenhuth Ludwig
Henriksson Elisabeth
Klingberg Anders
Akzo Nobel N.V.
Lithgow Thomas M
Mancini Ralph J.
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