Research on the application of soda feldspar in architectural decorative glass-ceramics

December 19 , 2023

Glass-ceramics (also known as crystallized glass) is a new type of architectural decoration material that is popular in the world. It is a polycrystalline solid material obtained by using high-tech glass controlled crystallization. The material has excellent physical and chemical properties, is considered to be an ideal substitute for high-grade natural stone products, in the domestic building decoration with micro glass production has begun to take shape, to achieve mass production.

At present, a large number of chemical raw materials are used in the production of microglass, especially some chemical raw materials such as chemical errors, soda ash and other high prices, resulting in high raw material costs, which affect the sales of products to a certain extent.

LS soda feldspar  is used as the main raw material, instead of alumina and soda ash, and other raw materials are added appropriately, and glass-ceramics are prepared by sintering method. The basic formula of glass-ceramics and the amount of soda feldspar introduced were determined.

General situation of LS soda feldspar

Soda feldspar is a collection of mining, processing, production, sales as one of the enterprises. High quality albite powder can reach more than 100,000 tons. The fineness of the processed albite meets the standard, the composition is stable, the color is uniform and the grade is high. Has been widely used in glass factory, ceramics factory, coating factory, etc., products have been exported to South Korea, Japan and Southeast Asia and other countries.

Specification of Sodium Feldspar

Al2O3 19-22% Al2O3 is generally 15-18%, ours is 19-22%, high aluminum can burn quickly at low temperatures
SiO2 65%min
Fe2O3 0.1%±0.05 Fe2O3  less than 0.1%, low iron can increase whiteness
Na2O 11%±0.5 Na2O with a content of more than 10% is high sodium, and sodium improves the gloss and light transmittance of the product
CaO 0.6%max
Whiteness 55° Low iron content will lead to high whiteness, which belongs to high-quality soda feldspar
Sodium feldspar powder from Anyang Lishi Industrial has the advantages of fast burning at low temperatures, increasing whiteness and gloss

Parameter of Sodium Feldspar

Chemical Analysis Other Properties
Product Code SiO2 Al2O3 Fe2O3 TiO2 CaO MgO Na2O K2O L.O.I. Particle Size Distribution Oil Absorption Density  Mohs Hardness
% % % % % % % % % D10 D50 D97 g/100g g/cm³



65.04 21.28 0.52 0.14 0.22 0.13 10.48 1.08 0.8 0-10mm, 95% pass 22.41g/100g 2.6 6


(100 Mesh)

66.75 19.81 0.13 0.03 0.54 0.18 11.2 0.41 0.65 25μm 58μm 145μm 22.41g/100g 2.6 6


(200 Mesh)

66.63 19.84 0.13 0.03 0.67 0.07 11.11 0.4 0.81 25μm 40μm 65μm 22.41g/100g 2.6 6


(325 Mesh)

66.35 19.81 0.17 0.03 0.84 0.07 11.14 0.39 0.9 23μm 30μm 37μm 22.41g/100g 2.6 6


(600 Mesh)

62.6 21.83 1.1 0.26 1.16 0.38 8.36 1.91 2.2 10μm 14μm 20μm 22.41g/100g 2.6 6

Effect of feldspar on glass manufacturing process

After using soda feldspar, the melting temperature of the glass is significantly reduced by 5~15C. This is because soda feldspar has the following advantages:

• The low melting point and the low high-temperature viscosity of soda feldspar can improve the melting speed of glass.

• Soda feldspar has a strong ability to dissolve quartz and other minerals.

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