What impact does salt silicate carry bauxite flotation protection?
Sodium silicate types negatively charged silicic acid colloidal fragments and corresponding hydrolyzed parts with hydrolysis and polymerization in liquid remedy. Since they have the same acid radicals as silicate minerals, they are less complicated to adsorb on the surface of silicon-containing minerals, and the adsorption is relatively strong. On the one hand, as a result of the strong hydrophilicity of the silicic acid part, it boosts the repressive effect on minerals; on the various other hand, due to its adsorption, the minerals have a greater unfavorable capacity, which improves the repulsive pressure in between minerals and raises the silicon content. The diffusion of minerals influences the floatability of minerals, and due to the fact that the unfavorable charge of minerals is boosted, the adsorption of anionic collectors is weakened, or the adsorption of cationic collectors is boosted, therefore triggering restraint or activation. For that reason, the above 2 variables identify whether sodium silicate activates or inhibits minerals.
In the dodecyl amine flotation protection system, salt silicate has little effect on the flowability of diaspore; salt silicate can slightly turn on the flotation protection of kaolinite and pyrophyllite under acidic problems, while in alkali Under acidic conditions, it hinders the flotation of kaolinite and pyrophyllite; for illite, sodium silicate plays an inhibitory duty, and just reveals a small activation impact under very solid acidic conditions. Salt silicate is easily adsorbed on the surface of silicon-containing minerals to reduce their negative fee. The acidic conditions contribute to the cationization of the dodecylamine collector and enhance the electrostatic communication in between the collector and silicate minerals, hence turning on the silicate minerals flotation protection. Under alkaline conditions, as a result of the decrease of dodecylamine ions, the electrostatic communication is weakened, and the adsorption of the enthusiast is lowered. At the exact same time, the solid hydrophilicity of salt silicate inhibits the flotation protection of silicate minerals.
In the quaternary ammonium salt DTAL collector system, sodium silicate activates the flotation of diaspore and kaolinite. Near the neutral pH worth, the activation result of salt silicate on diaspore and kaolinite weakens., the flotation protection recovery rate reaches a nadir; for the flotation of illite and pyrophyllite, sodium silicate reveals a minor repressive effect. The local ions on the mineral surface are H+ and OH-. Under acidic conditions, the mineral surface is positively billed with protonation, and silicate anions are easily adsorbed; under alkaline conditions, silicate anions are conveniently adsorbed on the mineral surface via oxygenation, and Under neutral problems, mineral surface area sites mainly exist in the form of hydroxyl groups on the mineral surface area, which is not for the adsorption of silicate ions. The quaternary ammonium salt is entirely ionized in the aqueous remedy and communicates with the mineral surface area with electrostatic communication. The higher the adverse charge, the stronger the electrostatic communication and the less complicated it is for the enthusiast to adsorb. For that reason, under acidic or alkaline problems, salt silicate is more likely to trigger the flotation of kaolinite and diaspore, while under neutral conditions, the activation effect of sodium silicate is decreased. When it comes to illite and pyrophyllite, the (001) plane and the (001) airplane in their crystal structures are both silicon-oxygen tetrahedral layers. Considering that they have the same anions as silicate radicals, silicate radicals can quickly develop in illite and pyrophyllite. Solid adsorption happens on the stone surface area, and the hydrophilicity of silicate ions controls; that is, the repressive impact is higher than the activation effect. For that reason, salt silicate shows a small repressive impact in the flotation of illite and pyrophyllite.
Sodium silicate lowers the favorable potential of each single mineral surface under acidic conditions. It lowers the absolute value of the Zeta potential of diaspore, illite, and pyrophyllite under alkaline problems, while the Zeta potential of kaolinite. It even more reduces as the pH value increases. Under acidic problems, sodium silicate adsorbs silicate anions on the mineral surface area, reducing the positive capacity of the mineral surface area; while under alkaline problems, as a result of the adsorption cover of silicate ions on the mineral surface and the oxygen condensation polymerization of silicate ions, therefore reducing the hydroxyl sites on the mineral surface area. As the pH worth boosts, the negative potential on the mineral surface reduces.
As a result, under acidic problems, sodium silicate reduces the electropositivity of the mineral surface, thus lowering the undesirable effect of the mineral surface on the cationic enthusiast and boosting the adsorption of the collection agency on the mineral surface area. Because the level of cationization of dodecyl amine is related to the pH worth, compared with the fully cationized quaternary ammonium salt DTAL, the electrostatic effect of the mineral surface area on dodecyl amine is weak than the electrostatic result on DTAL. Therefore, the activation result of salt silicate on minerals in the DTAL system is stronger than that in the dodecylamine system.
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