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Calcium carbonates beneficiation

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Calcium carbonate (calcite) is found in limestone rock along with various mineral impurities, particularly silicates such as, quartz, mica, feldspar, etc. The most common known methods for separating the calcite from the mineral impurities involve physical separations whereby the limestone rock is first ground and slurried and the ground material is subject to flotation by employing some means which selectively imparts hydrophobicity to certain of the components of the rock to enable such components to be floated away. In the reverse flotation process it is the impurities which are floated away from the calcite. Documents download

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The most important criteria in evaluating the performance of a calcium carbonate ore collector are: (1) effective dosage level required;

(2) Yield, which is defined as the percent of calcium carbonate which does not float away during the reverse flotation; and

(3) Acid Insoluble, a measurement of silicate impurities in the beneficiated ore (the percent of the calcium carbonate product which remains following reaction with hydrochloric acid). Commercial goals for such criteria are a dosage level of from about 0.1 to about 0.5 pounds of collector per ton of ore, a Yield at least about 90% and an Acid Insoluble of less than about 0.5%. Of course, as discussed above, other considerations such as whether the collector comprises a single liquid system, its effect on product properties and its comparative cost can also be very important.