ろう石の粉砕過程における金属アルコキシドの助剤効果

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The functions as grinding aid of the liquid metal alkoxides such as silicon alkoxides and titanium tetranormal butoxide on the dry grinding of pyrophyllitic Roseki were elucidated. The alkoxides having low surface tension spread smoothly over the surface of the feed grains and simultaneously penetrate into their narrow cracks, leading to lower the surface energy of newly formed surface and to induce the so-called Rehbinder's effects. In addition, the alkoxides act the important role effectively to remove the moisture contained in the grinding system by the hydrolylic reaction, since the adsorbed water is a factor causing strong agglomeration. The low energy surface resulting from the formation of adsorbed layers of the alkoxides and those substances hydrolyzed partially contributes to decrease the cohesive forces among the particles. A phenomenon in which the sign of electrostatic charge of the particles was reversed from negative to positive due to the formation of adsorbed layer was obserbed. As a result of the improvement of the dispersibility of particles owing to the formation of the water repellent layers on the particle surface, the coating of the fines produced during the grinding onto thesurface pf coarse particles is prevented, namely the so-called cussion effect wasting the impact energy is released. Consequently, the size reduction of the Roseki proved to be accelerated and the selective grinding between hard quartz and soft pyrophyllite which are the main mineral constituents was controlled in the presence of the metal alkoxides. The effectiveness as grinding aid seems to be increased as the stability of the alkoxides against hydrolysis is higher. Excess addition of the alkoxides cause liquid bridging, resulting in the agglomeration of particles and the decrease of efficiency of grinding aid.
日本粘土学会の論文
1991-11-20

ろう石の粉砕過程における金属アルコキシドの助剤効果

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