Background and overview of properties and preparation methods of synthetic fluorphlogopite
Synthetic fluorphlogopite flakes KMg3(A1Si3O10)F2 (also known as synthetic mica) is a layered silicate compound formed by high-temperature reaction, melting, cooling, crystallization and growth of chemical raw materials and mineral raw materials. It does not contain hydroxyl groups, so it has good temperature resistance and good insulation; it is directly fired from compounds, so it has high purity and whiteness. The prepared synthetic fluorphlogopite powder is widely used in mica titanium pearlescent pigments, cosmetic powders, plastics and ceramic fillers. At the same time, the synthetic fluorphlogopite is widely used in the electronics industry due to its excellent electrical insulation properties. At present, the internal heating method is commonly used to bake artificially synthesized fluorphlogopite. Basically, quartz sand, alumina powder, fused magnesite, potassium fluorosilicate, potassium carbonate and other materials are used for high-temperature reaction to crystallize out high-purity, Stable synthetic fluorphlogopite flakes. However, after years of extensive use, high-quality quartz sand, alumina powder, potassium carbonate and other raw materials have become increasingly scarce, and their prices are also high. This not only leads to an increase in the production cost of artificially synthesized fluorphlogopite, but is also detrimental to ensuring the artificial synthesis of fluorphlogopite. The quality is difficult to meet the strong market demand for high-quality synthetic fluorophlogopite flakes.
Properties and preparation methods of synthetic fluorphlogopite
A preparation method for artificially synthesizing fluorphlogopite, which is characterized by including the following steps:
(1) Equipped raw materials: The molar ratio of SiO2, MgO, Al2O3, calcium carbonate K2CO3 and K2SiF6 contained in the equipped raw materials is: SiO2:MgO:Al2O3:K2CO3:K2SiF6=(16-a):18 :3: (1-a): (2+a), 0.1≤a≤0.5;
(2) Build the furnace body and install electrodes in the furnace body;
(3) Mix the raw materials prepared in step (1) evenly and then fill the raw materials into the furnace body;
(4) Apply electricity to melt the raw materials in the furnace body;
(5) Power outage, allowing the materials inside the furnace to naturally cool and crystallize;
(6) Open the furnace and take out the synthetic mica.
The chemical reaction formula for artificially synthesizing fluorphlogopite is: 16SiO2+18MgO+3Al2O3+K2CO3 +2K2SiF6=6KMg3(AlSi3O10 sub>)F2+CO2↑
