Know "Wollastonite"

Wollastonite component Ca3[Si3O9]. Triclinic system. Usually in sheet, radial or fibrous aggregates. White microstrip gray. Glass luster, cleavage surface pearl luster. Hardness 4.5 to 5.0. The cleaved parallel {100} is complete, parallel {001} medium, and the cleaved facet angle is 74°. Density 2.78 to 2.91 g/cc. The contact metamorphic zone, which is mainly produced in acidic intrusive rocks and limestone, constitutes the main mineral component of skarn. In addition, it is also found in some deep metamorphic rocks. Used as: raw materials or fillers for papermaking, ceramics, cement, rubber, plastics, etc.; gas filter materials and heat insulation materials; and metallurgical fluxing agents.

composition

CaSiO3 or CaOSiO2, containing SiO251.75%, CaO48.25%. Often contains iron, manganese, magnesium.

nature

Wollastonite is a triclinic, thin plate-like crystal, aggregates are radial or fibrous. The color is white, sometimes with light gray, light red tone. Glossy glass, cleaved surface with pearl luster. The hardness is 4.5 to 5.5 and the density is 2.75 to 3.10 g/cm3. Completely soluble in **. In general, it is resistant to acids, alkalis and chemicals. Hygroscopicity is less than 4%. Low oil absorption, low electrical conductivity, good insulation. Wollastonite is a typical metamorphic mineral, which is mainly produced in the contact zone between acidic rock and limestone, and is symbiotic with Fushan stone and garnet. Also seen in deep metamorphic calcitic crystalline schist, volcanic eruptions, and certain alkaline rocks. Wollastonite is an inorganic acicular mineral, its characteristics are non-toxic, chemical resistance, thermal stability and dimensional stability is good, there are glass and pearl luster, low water absorption and oil absorption value, mechanical properties and electrical properties are excellent and have a certain Reinforcement effect. The company's wollastonite products are long and easy to separate, have low iron content and high whiteness. This product is mainly used as a reinforcing filler for polymer-based composite materials. Such as plastics, rubber, ceramics, coatings, building materials and other industries.

Basic Features

Wollastonite belongs to a kind of chain metasilicate, which is also a kind of fibrous and acicular. Due to its special crystalline morphology, the crystal structure determines

Its nature, wollastonite has a good insulation, while having a high degree of whiteness, good dielectric properties and high heat and weather resistance. Wollastonite is widely used in ceramics, chemicals, metallurgy, paper, plastics, coatings and other fields.

Basic classification

Coating grade wollastonite powder

With a good reinforcement, it can not only improve the toughness and durability of the coating, but also keep the coating surface smooth and with good gloss. It also improves anti-scrubbing and anti-weathering properties, reduces oil absorption of paints and inks, maintains alkalinity, and is resistant to corrosion. A high-quality, bright-colored coating can be obtained with good leveling and anti-aging properties. The paint can get better mechanical strength, increase durability, enhance adhesion and corrosion resistance. There is also good coverage and adhesion.

Plastic and rubber grade wollastonite

Has a unique needle fiber, has good insulation, abrasion resistance, and high refractive index. It is a good filling material for plastics and rubber products. Features and Performance: Wollastonite powder can improve impact strength, enhance fluidity and improve tensile strength, impact strength, linear stretching and mold shrinkage.

Friction level wollastonite powder

It is a special needle structure with the unique physical and mechanical properties of wollastonite. The friction and heat resistance of the finished product are greatly enhanced. When the product is filled inside, it can improve the friction flexibility and stability

Paper grade wollastonite powder

After a special processing process, it can still maintain its unique needle-like structure, so that the whiteboard paper added with silica fume powder can improve its whiteness, opacity (surface coverage), flatness, smoothness, adaptability, and reduction. Quantitative transverse displacement and cardboard wet deformation, improve printing adaptability, and can significantly reduce the use of other raw materials, reducing the overall cost of paper products.

Building material grade wollastonite powder

It is a kind of non-toxic, odorless, non-radioactive, etc. It has gradually replaced asbestos that is harmful to human health and has become a new raw material for environmental protection building materials in the new century. After a special processing process, it can still maintain its unique needle-like structure, so that the impact resistance, bending strength and abrasion resistance of materials such as calcium silicate board and fireproof board with wollastonite needle powder added are greatly improved. In the field of building materials, wollastonite will be more widely used!

Ceramic grade wollastonite powder

Adding a suitable amount of wollastonite powder to the ceramic raw material can greatly reduce the firing temperature, shorten the firing time, and achieve a low-temperature rapid firing. Save a lot of fuel, significantly reduce product costs; At the same time improve the product's mechanical properties, reduce product cracks and warpage, increase glaze gloss, improve the strength of the embryo body, and then improve the product pass rate.

Wollastonite application

Wollastonite can make brake pads, ceramic glazes, etc., and is widely used in automobile, metallurgy, ceramics, plastics and other industrial production. Among them, the most promising field for wollastonite consumption in the world currently is the engineering plastics industry. Wollastonite is used as a filler and reinforcing agent for the plastics and rubber industry. It is increasingly replacing metal components in industrial products and the market Demand has grown rapidly.

Thanks to the improvement of processing methods and the acquisition of ultra-fine particles, potential new uses are being discovered one after another, making the use of wollastonite increasingly widespread. According to foreign experts' predictions, the proportion of wollastonite applications in the future is as follows: 6% for the ceramics industry and related departments; 22% for paints, plastics and decorative materials; 5% for asbestos substitutes; 12% for insulating ceramic foams for El everyday living insulation articles Insulation ceramic foam for construction 6%; fire-resistant insulating ceramic foam 2%; casting production of ceramic foam 4%; slag concrete block coating 3%; paper production 40%.