What result does salt silicate carry bauxite flotation protection?
Salt silicate types adversely billed silicic acid colloidal particles and equivalent hydrolyzed parts through hydrolysis and polymerization in liquid option. Considering that they have the exact same acid radicals as silicate minerals, they are simpler to adsorb externally of silicon-containing minerals, and the adsorption is relatively strong. On the one hand, because of the solid hydrophilicity of the silicic acid component, it improves the repressive impact on minerals; on the various other hand, because of its adsorption, the minerals have a greater negative potential, which enhances the repulsive force between minerals and increases the silicon material. The dispersion of minerals impacts the floatability of minerals, and since the negative fee of minerals is boosted, the adsorption of anionic collection agencies is compromised, or the adsorption of cationic collectors is boosted, therefore creating inhibition or activation. As a result, the above 2 variables determine whether salt silicate triggers or inhibits minerals.
In the dodecyl amine flotation system, salt silicate has little effect on the flowability of diaspore; sodium silicate can somewhat trigger the flotation protection of kaolinite and pyrophyllite under acidic conditions, while in alkali Under acidic problems, it prevents the flotation of kaolinite and pyrophyllite; for illite, salt silicate plays an inhibitory role, and only shows a small activation result under extremely solid acidic conditions. Salt silicate is quickly adsorbed externally of silicon-containing minerals to minimize their adverse fee. The acidic problems contribute to the cationization of the dodecylamine collector and improve the electrostatic interaction between the collection agency and silicate minerals, therefore turning on the silicate minerals flotation. Under alkaline problems, because of the decrease of dodecylamine ions, the electrostatic interaction is damaged, and the adsorption of the enthusiast is reduced. At the very same time, the solid hydrophilicity of salt silicate inhibits the flotation of silicate minerals.
In the quaternary ammonium salt DTAL collection agency system, salt silicate activates the flotation protection of diaspore and kaolinite. Near the neutral pH worth, the activation impact of sodium silicate on diaspore and kaolinite weakens., the flotation recovery rate gets to a low point; for the flotation protection of illite and pyrophyllite, sodium silicate reveals a minor inhibitory effect. The local ions on the mineral surface are H+ and OH-. Under acidic problems, the mineral surface area is favorably billed with protonation, and silicate anions are easily adsorbed; under alkaline conditions, silicate anions are quickly adsorbed on the mineral surface area via oxygenation, and Under neutral problems, mineral surface websites primarily exist in the form of hydroxyl groups on the mineral surface area, which is not conducive to the adsorption of silicate ions. The quaternary ammonium salt is entirely ionized in the aqueous solution and communicates with the mineral surface with electrostatic interaction. The higher the negative fee, the stronger the electrostatic interaction and the much easier it is for the collection agency to adsorb. As a result, under acidic or alkaline conditions, sodium silicate is more probable to turn on the flotation protection of kaolinite and diaspore, while under neutral problems, the activation result of sodium silicate is reduced. When it comes to illite and pyrophyllite, the (001) aircraft and the (001) aircraft in their crystal structures are both silicon-oxygen tetrahedral layers. Given that they have the very same anions as silicate radicals, silicate radicals can quickly form in illite and pyrophyllite. Solid adsorption occurs on the rock surface area, and the hydrophilicity of silicate ions dominates; that is, the repressive effect is greater than the activation result. For that reason, salt silicate reveals a mild repressive effect in the flotation protection of illite and pyrophyllite.
Sodium silicate lowers the favorable possibility of each single mineral surface under acidic conditions. It lowers the absolute value of the Zeta possibility of diaspore, illite, and pyrophyllite under alkaline problems, while the Zeta potential of kaolinite. It even more decreases as the pH worth rises. Under acidic problems, sodium silicate adsorbs silicate anions on the mineral surface, decreasing the favorable capacity of the mineral surface; while under alkaline problems, because of the adsorption cover of silicate ions on the mineral surface area and the oxygen condensation polymerization of silicate ions, consequently reducing the hydroxyl websites on the mineral surface. As the pH worth rises, the negative possibility on the mineral surface area decreases.
As a result, under acidic conditions, salt silicate lowers the electropositivity of the mineral surface area, therefore reducing the repulsive result of the mineral surface on the cationic collection agency and improving the adsorption of the collector on the mineral surface area. Considering that the level of cationization of dodecyl amine is related to the pH worth, compared to the fully cationized quaternary ammonium salt DTAL, the electrostatic impact of the mineral surface area on dodecyl amine is weak than the electrostatic result on DTAL. Consequently, the activation impact of sodium silicate on minerals in the DTAL system is more powerful than that in the dodecylamine system.
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