Sodium feldspar powder produced grinding mill is applied to glass ceramics

2019-04-28

Online Consultation

There are many kinds ofsodium feldspar grinding mills, such as: Raymond mill, high pressure mill, high pressure suspension roller mill, vertical mill, three-ring medium speed micro powder grinding mill, etc., sodium feldspar milling The machine is mainly suitable for the ultra-fine powder processing of non-inflammable and explosive brittle materials with medium and low hardness and Mohs hardness ≤6, such as wollastonite, chalk, albite, dolomite, carbon black, kaolin, Bentonite, talc, mica, magnesite, illite, pyrophyllite, vermiculite, sepiolite, attapulgite, rectorite, diatomaceous earth, wollastonite, gypsum, alumite, graphite, fluorite, phosphate rock More than 100 kinds of materials such as stone, potassium ore and pumice, the fine powder finished product can be arbitrarily adjusted between 0-3000 mesh, and the output can reach 0.5-12 tons per hour.

sodium feldspar grinding mill
 
Glass ceramic is a new type of building decoration material popular in the world. It is a polycrystalline solid material obtained by high-tech glass controlled crystallization. This material has excellent physical and chemical properties and is considered as an ideal substitute for medium and high grade natural stone. In China, the production of glass-ceramics for architectural decoration has begun to take shape and mass production has been realized. At present, the production of glass-ceramics uses a large number of chemical raw materials, especially some chemical raw materials such as alumina, soda ash and so on, which leads to high raw material costs, which will affect the sales of products to a certain extent. Experts and professors of Hunan Building Materials College have studied the use of albite from Hengshan Hengshan in Hunan Province as the main raw material, replacing alumina and soda ash, adding other raw materials as appropriate, and preparing glass-ceramics by sintering method to determine the basis of glass-ceramics. Formulation and introduction of albite. It is estimated that the cost can be reduced by 15 yuan per square meter, which broadens the application field of albite.
 
1. Effect of albite on the melting process of glass
After repeated tests, after using albite, the melting temperature of the glass is significantly reduced by 5-15 ° C. This is because albite itself has the following advantages: 1 sodium albite has a low melting point, low temperature viscosity, and can improve glass. Melting speed; 2 sodium feldspar has strong dissolving ability for minerals such as quartz.
 
2. Effect of glass composition on crystallization process
According to the special requirements of the sintering process, the composition of the glass should be easy to devitrify, and it must have fluidity in the crystallization treatment to facilitate the adhesion sintering between the particles. The crystallization of glass is distinguished from the case where nucleation is induced by the nucleating agent to uniformly crystallize the inside of the glass. The surface nucleation of the glass particles is nucleated, and the composition of the glass must satisfy the requirements of the process.
The results show that when the content of CaO is high, the glass is easy to crystallize, and the viscosity at high temperature is lowered, but the material property is short; the content of CaO is too low, which is not conducive to the precipitation of β-wollastonite. As a network regulator, Na2O and K2O can significantly reduce the melting temperature of glass, but when the content is too high, it will lead to the precipitation of a large number of heterogeneous crystals, thus destroying the physical and chemical properties of the product; ZnO and BaO are beneficial to the crystallization of glass, but ZnO The content is not too high, BaO is also beneficial to improve the optical properties of the product; when SiO2 is used as a network forming body to take a higher value, it can enhance the network structure, slow down the high temperature crystallization and ensure the formation of glass. Too high will make the glass difficult to melt.
 
3. Effect of heat treatment process
After the chemical composition of the glass ceramics is determined, the heat treatment system determines the microstructure of the glass after crystallization, thereby affecting the physical and chemical properties of the glass ceramics. The dominant factors in the heat treatment system include nucleation temperature, crystallization temperature, nucleation time, crystallization time and heating rate. If the nucleation temperature is too low and the nucleation time is too short, the nucleation amount is small, and it takes a long time to reach a large nucleation amount, and a coarse crystal structure is easily formed after crystallization, resulting in a decrease in mechanical properties of the material. On the other hand, if the nucleation temperature is too high, a part of the crystal grows to cause an increase in the viscosity of the glass, which is disadvantageous for sintering between the particles. On the other hand, if the crystallization temperature is too low, the crystallization is insufficient, but the crystallization temperature is too high, and the crystallization time is too long, which also forms a coarse crystal structure, affects mechanical properties, and even causes a large number of clustered bubbles on the surface of the product. , affecting product quality and decorative effects.