PROCESS FOR OBTAINING APATITE CONCENTRATES BY FROTH FLOTATION
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United States of America Patent
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app pub date -
Mar 15, 2013
filing date -
Jun 9, 2010
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Abstract
A process applicable to different lithologies of phosphate ore with siliceous-carbonated matrix from igneous or sedimentary origin rocks includes ore preparation by comminution through crushing, grinding, and de-sliming, prior to apatite flotation. During flotation, ground and de-slimed ore pulp with high concentration of solids, above 40%, is initially conditioned with depressant reagent, e.g., a vegetable starch gelatinized with sodium hydroxide solution, and conditioning with collector reagent (sulphosuccinate or sulphosuccinamate). This conditioned pulp floats apatite in a circuit with rougher, scavenger, cleaner and recleaner flotation steps. CO2 gas can be added in all or some flotation steps to a bubble generation system. The synthetic apatite collector provides selective flotation of apatite and carbonates from silicates and other gangue minerals in the rougher and scavenger flotation steps, while the combination of effects of the synthetic collector with CO2 gas provides selective apatite flotation from the carbonates in the cleaner and recleaner steps.
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