Phosphate flotation
AssigneeW. R. Grace & Co.
InventorHoward L. Allen
Life of this patent
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Abstract
Use of reverse flotation for phosphate rock ore treatment, wherein starch is added first to depress phosphate rock particles, followed by addition of cationic reagent, e.g., amine to float the silica. Phosphate rock is recovered as sink concentrate and silica is recovered as float tailings.
Claims13
The method of reverse flotation for silica-containing phosphate rock ore, comprising adding potato or corn starch to the ore to depress phosphate rock particles, followed by adding cationic reagent to float the silica, and recovering phosphate rock as sink concentrate and silica as float tailings.
In the flotation separation of phosphate values from silica gangue in crude phosphate ore pulps where a cationic collector reagent is used for the silica and the ore pulp is subjected to flotation to provide a phosphate concentrate and silica tailings, the improvement comprising first treating the ore pulp with potato or corn starch, then treating the ore pulp with the cationic collector, whereby phosphate concentrate is obtained as underflow and silica tailings are obtained as overflow.
In the method of recovering phosphate ore by flotation of a crude phosphate ore containing phosphate rock particles and silica, the improvement comprising conditioning the ore as a slurry with potato or corn starch followed by treatment of the ore pulp with an amine collector for silica, followed by flotation whereby the phosphate rock particles sink and are recovered as concentrate, and the silica floats and is recovered as tailings.
Dependencies are inferred from the claim text.