Pyrophyllite is a layered aluminum-containing silicate mineral, its physical and chemical properties:
- 1) Mohs hardness of pyrophyllite is 1-2, with good machining performance, easy to break, easy to grind. The hardness increases with increasing SiO2 content.
- 2) Pyrophyllite powder are generally white, and the whiteness is generally 80, up to 93. The whiteness of pyrophyllite after calcination can reach 96.
- 3) High temperature stability, pyrophyllite refractoriness ≥1710 ℃. As the content of aluminum oxide increases, the refractoriness increases; as the ignition loss increases, the refractoriness increases; as the Fe content increases, the refractoriness decreases.
- 4) Good chemical stability of pyrophyllite, does not react with strong acids and bases.
In addition to the above characteristics, pyrophyllite also has excellent characteristics such as good lubricity, low thermal expansion, and low electrical and thermal conductivity.
Application of Pyrophyllite powder in Glass Fibre Industry
Glass fiber thermoplastic materials have developed rapidly over the past few years. Glass-reinforced materials, glass-reinforced building materials and other emerging products have become the new focus of the industry. The application areas of glass fiber have also been widely expanded, from automobile manufacturing, petrochemicals, electrical and electronic, rail transit, and construction. Building materials have expanded into emerging fields such as wind power generation, marine engineering, environmental engineering, aerospace, and filter dust removal. At present, construction, electrical and electronic and transportation are the three main areas of glass fiber application, accounting for more than 70%.
The upstream raw materials of glass fiber are mainly limestone, quartz sand, pyrophyllite, boronite, boehmite, dolomite and other ore raw materials, as well as chemical raw materials such as infiltrant, soda ash and boric acid. At the same time, they also need to consume energy such as electricity and natural gas , Energy costs and material costs each account for one-third.
In terms of raw materials, pyrophyllite accounts for more than half of the total cost of all raw materials, and it is the most important raw material. China‘s pyrophyllite resources are rich in reserves. At present, its proven reserves are 55 million tons, accounting for about 30% of the world’s total reserves, while quartz sand reserves It is 1.35 billion tons, so the glass fiber raw material supply has a greater resource advantage.