Talc is an aqueous silicate layered mineral with ionic bonds in the layer. Therefore, the surface is non-polar and highly hydrophobic. Talc hardness is small, there is slippery, density (2.7 ~ 2.8g / cm 3) ., Shiny glass block substantially dense oil sheen, often coexist with magnesite, hematite. Talc has a flaky shape, a block shape, a mixed shape, etc., and different structures have different properties and uses. Because talc has the characteristics of smoothness, flexibility, fire resistance, insulation, chemical stability and strong adsorption to oil, it is widely used in paper, ceramics, rubber, paint, medicine, casting and other industrial sectors.
Fine grinding is an important task for talc flotation. The talc product has a particle size of -74 μm, 98%, -44 μm, 98.5%, and -44/μm, 99.5%, and each contains a considerable amount of fine powder of 15 to 35 μm. The talc has good floatability and simple process structure, and generally can be selected by one rough selection, three to four times selection, and one sweep. Flotation can be carried out in a pH=13 to neutral medium. The collector may be a short-chain cationic amine, a petroleum sulfonate, a sulfate ester of a higher alcohol, a non-polar hydrocarbon oil or the like. The blade-like talc only requires a foaming agent. Fibrous talc requires the addition of an amine collector to float. When the ore contains iron oxide and the talc particles are wrapped by it, flotation is difficult. It has been reported that lowering the pH to 6 increases the selectivity of flotation. Adding an appropriate amount of sodium silicate during flotation can disperse the clay and iron oxide and improve the separation effect.
Fine grinding is an important task for talc flotation. The talc product has a particle size of -74 μm, 98%, -44 μm, 98.5%, and -44/μm, 99.5%, and each contains a considerable amount of fine powder of 15 to 35 μm. The talc has good floatability and simple process structure, and generally can be selected by one rough selection, three to four times selection, and one sweep. Flotation can be carried out in a pH=13 to neutral medium. The collector may be a short-chain cationic amine, a petroleum sulfonate, a sulfate ester of a higher alcohol, a non-polar hydrocarbon oil or the like. The blade-like talc only requires a foaming agent. Fibrous talc requires the addition of an amine collector to float. When the ore contains iron oxide and the talc particles are wrapped by it, flotation is difficult. It has been reported that lowering the pH to 6 increases the selectivity of flotation. Adding an appropriate amount of sodium silicate during flotation can disperse the clay and iron oxide and improve the separation effect.
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