Abstract: A phosphate ore flotation process for subjecting a phosphate ore containing dolomitic impurities to beneficiation as follows: The flotation feed is first conditioned with fatty acid and fuel oil as collectors and then reconditioned with humic acid as a modifier; subjecting the reconditioned flotation feed to rougher phosphate flotation to collect the rougher phosphate concentrate from the overflow; subjecting said rougher phosphate concentrate to at least one cleaner phosphate flotation; and recovering the phosphate product in the overflow from said cleaner phosphate flotation step.

Abstract: An improved phosphate ore beneficiation process wherein phosphate ore containing coarse, weathered dolomite in the flotation feed thereof is subjected to beneficiation as follows: The flotation feed is subjected to a rougher phosphate flotation step wherein it is treated with fatty acid and fuel oil and wherefrom is removed the coarse, weathered dolomite in one or more subsequent cleaner phosphate flotation steps without the use of additional flotation reagents added thereto; subjecting the float from said cleaner phosphate flotation step(s) to a sulfuric acid based partial deoiling step and then to a phosphate-carbonate flotation step wherefrom is collected a first fraction of the phosphate flotation feed values as underflow subjecting the overflow from said phosphate-carbonate flotation step to a sulfuric acid based total deoiling step wherefrom the resulting deoiled material from said total deoiling step is subsequently introduced and subjected to carbonate flotation step(s) using alkyl diphosphonic acid a