Wollastonite

Wollastonite is a calcium inosilicate mineral (CaSiO3) that may contain small amounts of iron, magnesium, and manganese substituting for calcium. It is usually white. It forms when impure limestone or dolomite is subjected to high temperature and pressure, which sometimes occurs in the presence of silica-bearing fluids as in skarns or in contact with metamorphic rocks.

Wollastonite is a natural mineral with many unique characteristics. Through advanced processing technology, it has become one of the most widely used functional fillers on the market. Wollastonite improves the performance of many products, including plastics, paints and coatings, building materials, friction, ceramics, and metallurgical applications.

Wollastonite Powder Chemical Analysis

Packing: 50kg, 1000kg, 1100kg bags.

Quantity: 20/20'GP.

Wollastonite Powder Uses

Some of the characteristics that make wollastonite so useful are its high brightness and whiteness, low moisture and oil absorption, and low volatility content. Wollastonite is mainly used in ceramics, friction products (brakes and clutches), metal manufacturing, paint fillers and plastics

Ceramics: Wollastonite can be used in a variety of ceramic applications, including ceramic glazes and porcelain, enamels, glass frits, fluxes and sanitary ware. This industrial mineral is the source of CaO in alkaline glaze formulations, which can increase the strength of the glaze. The LOI of wollastonite is also very low (<1%), and the gas generated during the firing process is the least, thus forming a smooth surface and reducing pinholes. Due to its needle-like structure, wollastonite improves green strength and reduces cracks and cracks.

Plastics: Among plastics, wollastonite improves the durability of composite materials due to its needle-like or needle-like structure. It also enhances electrical insulation, increases fire resistance, and improves dimensional stability. Compared with other materials, finer particle size can improve scratch resistance and impact resistance. In plastics, wollastonite improves tensile strength and flexural strength, reduces resin consumption, and improves thermal stability and thermal stability at high temperatures. Dimensional stability.

Construction: Wollastonite has been found to replace asbestos and is used in refractory construction products used in the construction industry. As a functional additive, wollastonite improves flexural strength and impact strength. Its low thermal conductivity and high aspect ratio structure also make wollastonite an attractive additive for applications requiring fire resistance. Wollastonite can be used for interior and exterior building panels, roof tiles, shaped insulation products, plates, panels and siding. Wollastonite can replace asbestos in floor tiles, friction products, insulation boards and panels, paints, plastics and roofing products. It has chemical resistance, inertness, stability at high temperatures, and improves flexibility and tensile strength

Paints and coatings: In coatings, fine needle-like particles can be used as a good leveling agent and settle the coating after application to form a dry film with uniform thickness, while interlocking particles can improve the toughness and durability of the coating , And has excellent color retention, frosting, and weather resistance. High brightness and whiteness reduce the pigment load, usually very low oil absorption, reduce the amount of binder required, and help reduce the cost of pigments. As mentioned earlier, wollastonite can also act as a pH buffer to improve the stability of the paint in the tank over a long period of time. The needle-like structure and alkalinity of wollastonite also make it an ideal auxiliary pigment in industrial coatings and primers to improve corrosion resistance. As an additive in paint, it can improve the durability of the paint film, and be used as a pH buffer, improve its weather resistance, reduce gloss, reduce pigment consumption, and be used as a matting agent and suspending agent.

Metallurgy: In metallurgical applications, the reasons for using wollastonite are low water solubility, low ignition loss, and high Ca-Si ratio. Wollastonite is usually added to formula powders for steel casting and welding. When the ratio of CaO/SiO2 is 1, it is easy to absorb Al2O3 which is harmful to the finished steel. Adding wollastonite to metallurgical flux can provide fusibility, good insulation properties and low viscosity. Because wollastonite is a natural low-temperature flux, it has been accepted by the flux formulation used in continuous casting of steel. When molten steel is continuously poured from a ladle or tundish, casting powder is used to maintain surface defects, prevent steel from oxidizing, lubricate the mold wall and absorb harmful inclusions. In metallurgical applications, wollastonite is used as a welding flux, a source of calcium oxide, a slag regulator, and protects the surface of molten metal during the continuous casting of steel

Friction: Wollastonite is used as a reinforcing additive in many friction applications due to its physical structure and non-hazardous properties. It is also a partial/full substitute for asbestos, ground fiber, chopped glass and synthetic materials. Its main applications are semi-metallic and non-asbestos formulations for truck blocks, drum liners, disc pads and friction paper.