Huayuan Wollastonite, Xinyu Wollastonite, Jiangxi Wollastonite
Wollastonite is widely used in ceramics, plastics, asbestos substitutes, metallurgy, coatings and other sectors due to its low water absorption, thermal stability and conductivity, and chemical inertness. At present, the annual consumption of wollastonite in the world is about 600,000 tons, ceramics accounts for 40% to 50%, plastics 20% to 25%, asbestos substitutes 20% to 25%, metallurgy accounts for 10%, pigments and others account for 5 %. High aspect ratio wollastonite (15: 1 ～ 20: 1) It is mainly used as a functional filler in coatings, plastics and rubber to improve hardness, bending strength and impact resistance. It can also improve the electrical properties of plastics and its Thermal stability, enhanced corrosion resistance and abrasion resistance; it can also replace asbestos in the manufacture of friction materials, insulation materials and flame retardants. Milled wollastonite (low aspect ratio wollastonite 3: 1 to 5: 1) is mainly used as a raw material for CaO and SiO2 in ceramic and glass manufacturing processes, and as a low temperature flux for the metallurgical industry.
As can be seen from the above table, the main uses of wollastonite in the world today are the ceramic industry and functional fillers in plastic, rubber, and paint coatings. Ceramics is the largest consumption field of wollastonite, and about half of the world's output is consumed in this field every year. Wollastonite as a ceramic raw material can increase the strength of the ceramic body and ceramic products, reduce the chipping and glaze spots of the ceramic, increase the surface gloss of the glaze, and reduce the fuel consumption (saving fuel by 60%). Therefore, wollastonite is a very promising energy-saving ceramic raw material. Some experts predict that the demand for wollastonite for the ceramic industry will increase year by year at a rate of about 5%. Acicular wollastonite powder is used in special ceramics.
Needle-shaped wollastonite powder has a needle-like structure and is non-toxic and harmless. It can partially replace asbestos, fiberglass, and pulp, and the price is relatively cheap. Due to the long-term exposure of asbestos to the air, which can cause environmental pollution, many countries around the world have established laws and regulations to restrict or prohibit the use of asbestos. Wollastonite is naturally the best substitute for asbestos due to its thermal stability, various enhancement properties, and its non-toxicity and harmlessness. In recent years, the use of wollastonite as a substitute for short-fiber asbestos has grown rapidly, with 35,000 to 40,000 t of wollastonite being consumed each year in industries such as construction materials and insulators. It is mainly used in fire wall panels, cement materials and friction materials. Other applications include interior wall panels, roof tiles, high-temperature insulation bricks and panels. The asbestos-based friction material was changed to needle-shaped wollastonite with high friction level, which mainly includes brake pads, valve plugs, and automotive clutches. At present, this market is steadily growing in many regions around the world.
Wollastonite's fastest growing consumer sector is the plastics industry. Adding wollastonite powder to plastic can improve the tensile strength and flexural strength of plastic products, reduce the amount of resin, and improve the thermal stability and shape stability of plastics at high temperatures. The surface treatment of acicular wollastonite powder can improve The adsorption strength of wollastonite and organic polymers improves the properties of molded products and is widely used in automotive plastics, PP, PV, PVC and other plastic products. At present, the automotive plastics market has become the fastest growing consumer field of wollastonite.
High-purity wollastonite powder, as an inorganic white pigment, is widely used in coatings and can replace expensive titanium dioxide; it can also replace part of anatase titanium dioxide in light-colored rubber products at a price only ten times that of titanium dioxide One-third.
The world's major consumers of wollastonite are: Europe, the United States, Japan, India, Mexico, and China. Wollastonite is mainly consumed in the ceramics industry in North America, but per capita tile consumption is lower than in Asia and Europe. Wollastonite consumption in Europe is mainly used in the ceramics and metallurgical industries, while Indian wollastonite consumption is mainly used in the ceramics and coatings industries. Wollastonite in China is mainly consumed in glazed tiles and ceramic ingots, accounting for more than 50% of the total consumption of wollastonite; other consumer fields include plastics, rubber, coatings, metallurgy, construction and asbestos substitutes. At present, the annual consumption of wollastonite in China is about 100,000 tons. The main consumer areas are ceramics, accounting for approximately 55%; metallurgy, accounting for approximately 30%; and other (plastics, rubber, paper, coatings, welding electrodes, etc.) account for approximately 15%.
The United States is an important consumer of wollastonite in the world. The domestic sales volume of wollastonite in 2002 was basically the same as that in 2001. Sales in the plastic consumer sector increased, while sales in other consumer sectors remained largely unchanged or declined slightly. From the perspective of product types, due to the slowdown of the US economic growth and the competition of foreign wollastonite prices, the sales of low-value wollastonite products in the United States fell in 2002, although the sales of high-value wollastonite products increased. However, the total amount is small, which has little effect on the total domestic wollastonite sales. U.S. wollastonite consumption is mainly in the industrial sectors such as ceramics, metallurgy, coatings and plastics. In recent years, the main consumption structure of wollastonite is roughly as follows: plastic 37%, ceramic 28%, metallurgy 10%, paint 10%, friction products 9% and other 6%.