Basalt fiber: a continuous fiber drawn from natural basalt, which is a continuous fiber drawn at high speed through a platinum-rhodium alloy wire drawing bushing after the basalt material is melted at 1450℃～1500℃. The color of pure natural basalt fiber is generally brown. Basalt fiber is a new type of inorganic environmentally friendly green high-performance fiber material, which is composed of oxides such as silica, alumina, calcium oxide, magnesium oxide, iron oxide and titanium dioxide.

Preparation method of basalt fiber:

  Compared with the melting of general glass fiber, the basalt melt has poor heat permeability and small wetting angle, so it is more difficult to control than other glass fibers during wire drawing.

The technical points mainly include three aspects:

  ① Basalt raw material formulation technology: The particle size of basalt raw materials and the defined range of components have a huge impact on the production of basalt fibers. It is necessary to control the raw material components within a certain range to meet the production requirements of basalt fiber.

  ②Production kiln design technology: There are two types of kilns for basalt fiber production, one is a flame furnace with gas as fuel, and the other is an electric melting furnace. The design technology of the kiln is directly related to the quality and productivity of basalt fiber production.

  ③Sizing formulation technology: The content of sizing agent is an important physical and chemical index of basalt fiber, which affects the appearance and performance quality of the product. At the same time, sizing agent is also one of the main raw materials with high price.

  Basalt fiber properties

  Basalt fiber is recognized at home and abroad as the fourth largest high-tech fiber after carbon fiber, aramid fiber and polyethylene fiber, and is known as "green and environmental protection new material in the 21st century".

It has good tensile strength, high corrosion resistance and chemical stability, good insulation, high temperature and low temperature thermal stability, high elastic modulus, good thermal insulation and sound insulation properties, etc.