Wollastonite is a triclinic, thin plate-like crystal, aggregates are radial or fibrous. China's wollastonite resources are abundant. So what are the major wollastonite producing areas in China? The following Xiao Bian introduced the origin of wollastonite and other related knowledge.
Wollastonite origin:
China's wollastonite production areas are widely distributed and have large reserves. The wollastonite mines in some producing areas are of good quality and have good development potential. At present, China has discovered more than a hundred wollastonite producing sites in 17 provinces and autonomous regions, with an estimated resource of nearly 200 million tons. As of the end of 1996, there were 31 proven mineral deposits in 14 provinces and autonomous regions and retained ore reserves of 132.65 million tons, ranking among the top in the world.
The province with the largest reserves is Jilin Province, which accounts for 40% of the country's total ore reserves; the rest are Yunnan, Jiangxi, Qinghai, and Liaoning provinces, accounting for 49% of the country’s total ore reserves; Zhejiang, Hunan, Anhui, Inner Mongolia, and Guangdong. 5 provinces and regions together account for 10% of the country's total reserves; Jiangsu, Guangxi, Hubei, and Heilongjiang provinces and regions account for 1% of the country's total ore reserves. Among them, Jilin Lishu Wollastonite Mining Co., Ltd. is the largest wollastonite producer in China. It owns 10 mines and processing plants and has an annual production capacity of 80,000 tons of wollastonite. Other large wollastonite production companies in China are: Dadingshan Wollastonite Mining Company of Lishu County, Jilin Province, Jiangxi Province Xinyu City Southern Wollastonite Industrial Company, Zhejiang Changxing Wollastonite Mining Co., Ltd. and Anhui Guangde The county is under the temple west wollastonite mining company.
In the past two years, the company’s scientific research capabilities, mining equipment, processing technologies, and inspection levels have greatly improved over the past few years. New products have continuously increased, and processing technologies for needle-shaped powders, ultra-fine powders, and modified powders continue to innovate. It has reached the international advanced level, and the deep processing capability has soared. It has completely changed the business model of selling raw ore, and the vitality of enterprises has been greatly enhanced. Not only old companies like Lishu Wollastonite Mining Co., Ltd. and Changxing Wollastonite Co., Ltd. have made significant progress, but also some emerging companies such as Yunnan Superfine New Materials Co., Ltd., Liaoning Jingang Wollastonite Co., Ltd., Jiangxi Xinyu Southern Wollastonite Co., Ltd., and Jiangxi Province. The development momentum of Huajietai Company, Lanshi Huanyu Wollastonite Company, Huangshi Xinyi Minerals Production Company, Dalian Global Minerals Company, etc. is also very strong, and the competitiveness in the domestic and foreign markets is continuously improving. Domestic wollastonite production continues to grow. At present, China has become a major producer of powdered wollastonite in the world.
Wollastonite is currently mainly used in the ceramic industry, accounting for about 50% of the total amount. This is due to the fact that wollastonite glazed tiles have the characteristics of low firing temperature, short time, high whiteness, and low cost. And many domestic ceramic factories have built a line of wollastonite as a base for the production of glazed tiles. It can be said that as a raw material for glazed tiles, wollastonite has found a shortcut for many, fast, good, and provincial industries for China's building ceramics industry.
The use of wollastonite:
Wollastonite belongs to a type of chain metasilicate and is also a fibrous, acicular. Because of its special crystalline morphology, its crystalline structure determines its properties. Wollastonite has good insulation properties, high whiteness, good dielectric properties, and high heat and weather resistance. Wollastonite is widely used in ceramics, chemicals, metallurgy, paper, plastics, coatings and other fields.
1 Paint industry
Excellent wollastonite powder is used in some products of paint and coating, instead of lithopone and some titanium dioxide, imported P820 as filler, can improve the leveling of the coating. The wollastonite particle shape is a very good suspending agent for the paint, and its precipitate is soft and dispersed, and can be used as a reinforcing agent for cleaning paints. Because of its low oil absorption. There is a high amount of filling and the consumption of adhesive substances is reduced, so the cost of the coating is greatly reduced. Wollastonite is alkaline, it is very suitable for polyvinyl acetate paint, so that the color material is evenly dispersed. It can connect pigments suitable for acidic media, and can also be made into bright colored paints. The surface has evenly distributed properties. Good performance. It is filled with filler and can improve the corrosion resistance of the steel coating. In addition to water-based coatings, polyvinyl formal, can also be used for primers, intermediate coatings, oil paints, road marking coatings, sound-insulating coatings, fire-resistant coatings, and so on. It can replace asbestos in bituminous paints, and wollastonite can be used as a reinforcing agent in self-cleaning paints. Wollastonite powder is used in the ink industry to replace some of titanium dioxide and lithopone, and has also achieved ideal results.
2 in the application of rubber and plastic
Wollastonite powder has been used in vulcanized rubber, paving bitumen vinyl tile, vinyl resin, poly ether epoxy resin vinyl plastic board, phenol model. 50% wollastonite powder is used as a filling agent in the production of epoxy resin, and has a low water absorption rate in the non-solidified state. Wollastonite can improve the properties of polymer materials and make elastic material fillers, which can reduce the price. This synthetic material has high thermal stability, low dielectric constant and water absorption, and stable mechanical properties.
Wollastonite is widely used as a filler in polypropylene, polystyrene, polyvinyl chloride, and polyethylene. Compared with other fillers, wollastonite has excellent electrical, mechanical, and thermodynamic properties. The addition of wollastonite to the polystyrene resin composition can reduce the amount of expensive pigment without affecting the quality. The use of wollastonite in polypropylene compounds also saves money. Since wollastonite has a low moisture content, a light and glossy color, a stable shape, and a reinforced nature, it is often used in nylon molding materials. Wollastonite powder is used in the soles of rubber shoes industry to replace some of the titanium dioxide, white carbon, clay, etc., with good results. For hoses and tapes, the product quality is improved, and the cost is significantly reduced.
3 Application in metallurgy and refractory industry
Wollastonite has a stable chemical composition and its alkalinity value is close to 1. It is an ideal raw material for metallurgical mold dregs. In the early 1980s, China began to use wollastonite to produce metallurgical protective slag, and gradually expanded its varieties. It is now widely used in many types such as die casting, continuous casting (slab, billet), synthetic slag, and stainless steel continuous casting. The low-grade wollastonite can be used as the mold powder, so the cost is low. In recent years, there have been new developments in the application of wollastonite in the metallurgical industry. Wollastonite has been widely used in metal mold coatings, sprayed molten steel, refractory bricks, fire-resistant insulators, ceramic insulating foams, etc. Some experts believe that wollastonite should be a refractory material.
4 Application in Ceramic Industry
Adding appropriate amount of wollastonite to the ceramic raw material (medium and low grades only) can greatly reduce the firing temperature, shorten the firing time of the product, achieve a rapid firing at a low temperature, save a lot of fuel, and significantly reduce the product cost. Since wollastonite products do not contain alkali metal, so it has good electrical insulation properties, and both high impact strength and shape stability, this feature makes wollastonite in the precision ceramics, process ceramics industry has been applied. In the glaze and mud raw materials, using wollastonite instead of white pigments can increase the gloss of the glaze, reduce the viscosity of the glaze, and greatly reduce the cost. Wollastonite in ceramics can prevent porcelain from cracking, microcracks, breakage, and enamel defects. Wollastonite has linear thermal expansion properties. Therefore, the degree of product deflection can be reduced. Adding 1% wollastonite to the glaze reduces the thermal expansion enough to prevent the glaze from cracking when exposed to air.
5 in the application of electrical insulation materials
When wollastonite forms a non-conductive crystal, it has a high insulation rate, and this property is a valuable material in high-quality electrical equipment. U.S. companies add 20% wollastonite in the manufacture of electrical ceramics, making the price of such products fall by 20 times. Insulating materials allow extremely small amounts of electricity to be passed. Therefore, wollastonite is used in industries such as radio ceramics, low-dielectric-consumption insulators, ceramic insulating foams for day-use insulators, and building-insulating ceramics. Wollastonite is also particularly useful for UHF specialized electronic devices such as high temperature ceramic components, high voltage circuit breakers, phenolic adhesive resistors, and inorganic insulating materials at temperatures above 500°C.
6 in the welding electrode industry
Wollastonite is used for the coating of electrodes, accelerating the melting speed and has been applied in foreign countries for many years. Wollastonite is used for the coating of electrodes, which has the advantages of energy saving, anti-cavitation, enhanced weld strength, smooth surface of the weld, improved droplet transfer, and accelerated coating melt speed. In particular, our company's wollastonite has a low impurity content and excellent quality, and it is suitable for special welding and buried flux.
7 Wollastonite instead of short fiber asbestos and fiber talc
Since asbestos products can easily cause people to develop cancer, this has formed a consensus in industrialized countries such as the United States and Japan. So now they have begun to eliminate the use of asbestos and its products, and instead use asbestos wollastonite instead of short fiber asbestos and glass. Fiber, put into industrial production. The acicular wollastonite produced by our company is the ideal raw material for the processing of acicular wollastonite powder, and has a broad development prospect.
8 other uses
a, wollastonite is used in papermaking, is a very promising industry, according to foreign experts' predictions, the long-term demand for wollastonite 750,000 tons, of which papermaking accounted for 40%.
b. Due to the low loss of wollastonite, it becomes a natural glass raw material with almost no bubbles, and it can reduce the melting temperature, shorten the melting time, and save a lot of energy.
c. Wollastonite will greatly increase melting speed and high temperature shockproof performance in the production of porcelain bonded abrasives and grinding wheels. Some are also used in fine grinding wheel binder material fillers.
d. In the FRP industry, the use of wollastonite instead of fillers in resins can significantly reduce product costs.
e. Wollastonite powder can be used as slag cement block coating.
f, wollastonite can be asbestos - cement matrix products.
g, wollastonite is also used in bonded ceramic products, laminated plastics, marking materials, matches, oil-impact paper, plywood, artificial rubber, siding and so on.
h. Abrasive tools, casting products, electrical equipment, shipboard walls, metal products, enamel coating, coating of reinforced concrete blocks, white cement, padding of brake structures, pressure vessels, used for ceramic bonding in foreign countries, Oil fillers, battery separators, etc., are all applications for wollastonite.
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