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- W2003258518 abstract "Abstract Anionic flotation of salt-type minerals is governed by many surface and bulk reactions between the collector and the dissolved mineral species. An extremely high consumption of the collector CHEMIPHOS-O, which is a commercial blend of fatty acids (7 kg/t), was required for stepwise flotation of a siliceous sedimentary phosphate at pH 9.5. Two main alternatives were suggested to counteract the effect of dissolved Ca++ and Mg++ on collector precipitation in the flotation pulp. By changing the addition sequence, where the ore was added to the collector solution instead of water to avoid direct contact with water, a remarkable drop in the collector consumption to 4.5 kg/t was achieved. Similarly, the use of a modifying or chelating agent e.g. NaF or Na2CO3 led to a further decrease in the collector consumption. Fluoride ions having a strong preference for Ca++ ions both chelate its effect in the pulp and activate phosphate flotation as well. Soda ash, as a conventional chelating agent for Ca++ and Mg++ ions as well as a pH regulator gave better results. A phospho-concentrate assaying about 31.8% P2O5, 4.61% SiO2 and 1.64% Fe2O3 was obtained, from a feed having 25% P2O5, 13.8% SiO2 and 2.24% Fe2O3, using this latter reagent at a collector consumption of 3 kg/t. A relative improvement in the P2O5 recovery from 78.6% to 84.5% was achieved by optimizing the mode of adding collector in two steps instead of one." @default.
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- W2003258518 date "1990-01-01" @default.
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- W2003258518 title "Different alternatives for minimizing the collector consumption in phosphate fatty acid flotation" @default.
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- W2003258518 doi "https://doi.org/10.1016/0892-6875(90)90122-r" @default.
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