B - Operations – Transporting – 03 – D
Patent
B - Operations, Transporting
03
D
B03D 1/01 (2006.01) C07C 259/06 (2006.01) C22B 3/16 (2006.01)
Patent
CA 2333377
Collector compositions of a mixture of a C6 to C22 fatty hydroxamic acid and an oil for use in the removal of impurities from mineral ores by the froth flotation method. The collectors are prepared by reacting an ester of a C6 to C22 fatty acid with a hydroxylamine salt and a base in the presence of an oil and water to produce an alkyl hydroxamate salt; acidifying the alkyl hydroxamate salt, forming an organic layer and an aqueous layer, wherein the organic layer contains a C6 to C22 fatty hydroxamic acid substantially free of starting esters and hydrolysis and transesterification products of the ester, and separating the organic layer from the aqueous layer to provide a collector composition of the C6 to C22 fatty hydroxamic acid and the oil.
L'invention concerne des compositions collectrices à base d'un mélange qui comprend un acide hydroxamique gras de C6 à C22 et une huile, destinées à l'évacuation des impuretés de minerais minéraux au moyen du procédé de flottation par mousse. On prépare les compositions collectrices en faisant ce qui suit: on fait réagir un ester d'un acide gras de C6 à C22 avec un sel d'hydroxylamine et une base en présence d'une huile et de l'eau afin de produire un sel hydroxamate d'alkyle; on acidifie le sel hydroxamate d'alkyle en formant une couche organique et une couche aqueuse, la couche organique contenant un acide hydroxamique gras de C6 à C22 sensiblement exempt d'esters de départ et des produits d'hydrolyse et de transestérification de l'ester; et l'on sépare la couche organique et la couche aqueuse pour fournir une composition collectrice comprenant l'acide hydroxamique gras de C6 à C22 et de l'huile.
Magliocco Lino Giovanni
Rothenberg Alan S.
Cytec Technology Corp.
Smart & Biggar
LandOfFree
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