What are the properties and main uses of sodium feldspar?

Sodium feldspar is a common sodium-containing aluminosilicate rock-forming mineral. Sodium feldspar composition: Sodium feldspar is an aluminosilicate mineral containing potassium and sodium with a frame-like crystal structure composed of silicon-oxygen tetrahedrons. The main components are Na2O, Fe2O3, etc.

Sodium feldspar properties:

Sodium feldspar is generally gray-white, or colorless, or white, yellow, red, green or black; it is generally a glassy crystal, with a specific gravity of 2.605g/cm3 and a Mohs hardness of 6. Sodium feldspar The theoretical melting point is 1100°C, but the melting point of natural sodium feldspar ore varies with the chemical composition, it is brittle and the fracture is rough.

Sodium feldspar uses:

Sodium feldspar is mainly used in the manufacture of ceramic body ingredients and glazes; it is one of the main components of glass mixtures, feldspar contains high alumina and low iron content, which can reduce the amount of alkali; It can also be used as a raw material for enamel, mainly using feldspar and other mineral raw materials to blend into enamel. In addition, Sodium feldspar is also used in soap, tiles, floor tiles, abrasives and other industries.

1. Glass solvent

Sodium feldspar is one of the main components of glass mixture. Feldspar contains high alumina and low iron content, which can reduce the amount of alkali. In addition, the process of sodium feldspar melting into glass is relatively slow, and the crystallization ability is small, which can prevent crystals from being precipitated during the glass formation process and damage the product. Sodium feldspar can also be used to adjust the viscosity of the glass.

2. Ceramics

The sodium feldspar can act as a barren raw material before the ceramic body is fired, reduce the drying shrinkage and deformation of the body, improve the drying performance, and shorten the drying time. It can be used as a flux filling in the body during firing to make the body Dense and reduce voids, but also improve the light transmittance of green body. The use of Sodium feldspar rock in ceramic production can save electricity, coal and raw materials, and reduce production costs to a certain extent.

At present, my country has not formulated a unified quality standard for feldspar mineral products, and its general quality requirements are: Fe2O3<0.3%~1%; Sodium feldspar can be used to produce polished bricks, exterior wall tiles, floor tiles, etc.

3. Ceramic fiber

Ceramic fibers are industrially used as filter materials for severely corrosive gases or liquids, and can also be used as thermal insulation, electrical insulation and sound insulation materials. When manufacturing ceramic fibers, adding albite feldspar can reduce production energy consumption by 2.5%.

4. Enamel glaze

As enamel glaze, Sodium feldspar is mainly used to blend other mineral raw materials into enamel. The dosage of feldspar is generally 20%~30%. The quality requirement for feldspar is similar to glass grade, but it should be ground finer, Na2O>4%.

5. Chemical raw materials and fillers

As a filler, Sodium feldspar is widely used in coatings, papermaking, rubber, refractory materials, plastics and other industries. Filler grade Sodium feldspar (such as used in foam rubber products) is similar to "ceramic grade" in fineness and chemical composition, but a higher free quartz content is allowed. In chemical engineering, Sodium feldspar powder is added to polyolefin film-forming components to increase film-forming uniformity and transparency.

6. Sodium feldspar jade (water foam jade)

Sodium feldspar jade, commonly known as "Shuimozi (Shuimo jade)" in business and trade. It is a type of jade that is associated (symbiotic) with jadeite. Sodium feldspar is called "water foam" because white "cotton" or "white brain" is often distributed on its white or gray transparent base, which looks like foam in water. Most of the water foam jade is fully transparent and translucent, and less transparent. Common textures are glass, ice, and waxy.

7. Other applications

Sodium feldspar is also used in soap, abrasives, abrasive tools, welding rods and other industries. The Sodium feldspar in the electrode coating can act as an arc stabilizer and a weld pool protectant.

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