What effect does sodium silicate have on bauxite flotation protection?
Sodium silicate types adversely charged silicic acid colloidal fragments and matching hydrolyzed components with hydrolysis and polymerization in aqueous service. Since they have the exact same acid radicals as silicate minerals, they are much easier to adsorb externally of silicon-containing minerals, and the adsorption is relatively strong. On the one hand, as a result of the solid hydrophilicity of the silicic acid part, it boosts the repressive effect on minerals; on the other hand, as a result of its adsorption, the minerals have a higher adverse possibility, which boosts the repulsive force between minerals and raises the silicon web content. The dispersion of minerals impacts the floatability of minerals, and because the adverse fee of minerals is improved, the adsorption of anionic enthusiasts is compromised, or the adsorption of cationic enthusiasts is boosted, thereby causing restraint or activation. For that reason, the above two aspects figure out whether salt silicate turns on or prevents minerals.
In the dodecyl amine flotation system, salt silicate has little effect on the flowability of diaspore; salt silicate can slightly trigger the flotation of kaolinite and pyrophyllite under acidic problems, while in antacids Under acidic problems, it hinders the flotation protection of kaolinite and pyrophyllite; for illite, salt silicate plays a repressive function, and only reveals a slight activation impact under really solid acidic conditions. Salt silicate is conveniently adsorbed on the surface of silicon-containing minerals to minimize their negative cost. The acidic problems contribute to the cationization of the dodecylamine enthusiast and improve the electrostatic communication between the collector and silicate minerals, hence triggering the silicate minerals flotation. Under alkaline conditions, because of the reduction of dodecylamine ions, the electrostatic communication is weakened, and the adsorption of the enthusiast is minimized. At the exact same time, the strong hydrophilicity of salt silicate inhibits the flotation of silicate minerals.
In the quaternary ammonium salt DTAL enthusiast system, salt silicate triggers the flotation protection of diaspore and kaolinite. Near the neutral pH worth, the activation result of sodium silicate on diaspore and kaolinite weakens., the flotation protection recuperation rate gets to a nadir; for the flotation of illite and pyrophyllite, salt silicate shows a small inhibitory impact. The localized ions on the mineral surface are H+ and OH-. Under acidic conditions, the mineral surface area is favorably charged through protonation, and silicate anions are conveniently adsorbed; under alkaline problems, silicate anions are conveniently adsorbed on the mineral surface area with oxygenation, and Under neutral problems, mineral surface sites primarily exist in the kind of hydroxyl groups on the mineral surface, which is not conducive to the adsorption of silicate ions. The quaternary ammonium salt is completely ionized in the liquid remedy and connects with the mineral surface area via electrostatic communication. The greater the adverse fee, the more powerful the electrostatic interaction and the less complicated it is for the collector to adsorb. For that reason, under acidic or alkaline problems, salt silicate is most likely to activate the flotation protection of kaolinite and diaspore, while under neutral conditions, the activation impact of sodium silicate is lowered. As for illite and pyrophyllite, the (001) aircraft and the (001) aircraft in their crystal structures are both silicon-oxygen tetrahedral layers. Considering that they have the same anions as silicate radicals, silicate radicals can easily create in illite and pyrophyllite. Strong adsorption happens on the stone surface area, and the hydrophilicity of silicate ions dominates; that is, the inhibitory impact is more than the activation result. Therefore, salt silicate shows a mild repressive impact in the flotation protection of illite and pyrophyllite.
Sodium silicate reduces the favorable capacity of each single mineral surface area under acidic problems. It minimizes the outright worth of the Zeta possibility of diaspore, illite, and pyrophyllite under alkaline problems, while the Zeta possibility of kaolinite. It better reduces as the pH value boosts. Under acidic problems, sodium silicate adsorbs silicate anions on the mineral surface area, decreasing the favorable potential of the mineral surface; while under alkaline problems, as a result of the adsorption cover of silicate ions on the mineral surface area and the oxygen condensation polymerization of silicate ions, thus lowering the hydroxyl websites on the mineral surface. As the pH value increases, the negative possibility on the mineral surface area decreases.
Therefore, under acidic conditions, salt silicate lowers the electropositivity of the mineral surface area, therefore decreasing the undesirable effect of the mineral surface on the cationic enthusiast and enhancing the adsorption of the collector on the mineral surface area. Considering that the degree of cationization of dodecyl amine is related to the pH worth, compared to the totally cationized quaternary ammonium salt DTAL, the electrostatic result of the mineral surface on dodecyl amine is weak than the electrostatic effect on DTAL. As a result, the activation effect of sodium silicate on minerals in the DTAL system is stronger than that in the dodecylamine system.
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