Grinding of MICA application of ultrafine grinding
MICA is an important non-metallic minerals, with a wide range of uses in industry. It is the alkali metal and metal water cut aluminum silicates of Kiss soil, chemical structural formula is: KAl2[AlSi30lo] (oH) 2, mica is a layered silicate mineral, and a good split, along the cleavage surface peeled into very thin slices. Muscovite MICA itself in addition to having excellent characteristics, it also has good sliding properties, coverage, such as adhesion characteristics. MICA crushed to what extent, flake, excellent flexibility, toughness. Superfine Muscovite luxury ideal filler for paints, coatings, cosmetics. More fine MICA powder, RADIUS-thickness ratio of the larger, stronger as a filling material their enhancement. As we all know maximum energy consumption, the least efficient at smashing jobs is concentrator unit process, enter the ultrafine grinding when grinding range, their energy consumption more efficient, less efficient. Therefore, how to improve grinding efficiency, improve grinding means more and more attention, I used in the grinding process of grinding AIDS and have access to good effect, has practical significance.
As more in-depth study of the mechanical milling, there is a growing discovery mechanical milling process is not just a mechanical process, and it's a mechanical chemical process, the material in the grinding process, their crystal structure, and chemical properties of a series of changes have taken place. Studies have shown that, in the process of grinding add some chemicals, can significantly improve grinding conditions to improve grinding efficiency. This fully shows the grinding in the important position of ultrafine grinding. Research can be seen from the above, grinding a very significant effect on Superfine grinding process. For grinding mechanism of grinding, at present there are liebinjieer and weisitewude "put forward by adsorption of lower hardness" and Krippahl "put forward by slurry rheology adjustments" two doctrines, this study combined with sodium hexametaphosphate, sodium tripolyphosphate on stirring mill grinding effect of Superfine grinding process of mica, analysis and discussion on its mechanism of grinding from different angles.
Grinding aid agent sodium hexametaphosphate, sodium tripolyphosphate on ultrafine grinding of MICA has a significant role in grinding, grinding a certain amount of scope when too much or too little will reduce the amount of grinding. Sodium hexametaphosphate optimum dosage for 2kg/t, the optimum dosage of sodium tripolyphosphate to 1. 5kg/t (C=60%), sodium tripolyphosphate grinding-aid effect of sodium hexametaphosphate well.
Grinding AIDS only when the concentration reaches a certain value in order to reflect the significant role in grinding, the optimum concentration of the test for c=60%.
Sodium hexametaphosphate, grinding-aid effect of sodium tripolyphosphate mainly reduce pulp viscosity, improve the rheological properties of slurry, and improving grinding efficiency grinding surface adsorbed on MICA minerals, MICA electric potential of the larger, increasing the electrostatic repulsion between particles, making it possible to stably dispersed particles, improving grinding efficiency.