Basalt is prone to forming hexagonal columnar joints and is brittle, so the stone blocks are generally small and lack large materials, making it difficult to produce large-sized slabs. Among them, the porous basalt, also known as pumice, has many pores and a hard texture. It can be mixed into concrete to reduce the weight of the concrete. It is not only strong and durable, but also has the characteristics of sound insulation and thermal insulation. It is a good aggregate for lightweight concrete in high-rise buildings. Floating stone is still a good grinding material, which can be used to grind metals and stone materials; In industry, it can also be used as a filter, dryer, catalyst, etc. It is also widely used in garden landscapes, mainly for rockeries, bonsai, etc. It is also used in home decoration. The use of basalt is very extensive, and its application is not limited to the construction industry. For example, basalt is a good raw material for producing "cast stone". After melting casting, crystallization treatment, annealing and other processes, it can form a new type of material that is hard and wear-resistant alloy steel, and more corrosion-resistant than lead and rubber; Basalt can also serve as a "lubricant" in an advanced steel casting process, extending the lifespan of the casting film; And basalt can also be extracted into glass fibers, making basalt glass fiber cloth stronger in alkali resistance and better in high temperature resistance than ordinary glass fiber cloth. Physical and technical properties of basalt:

Due to the variety of basalt types, here we take Fuding Black (G684) as the data prototype for reference: Fuding Black Basalt (G684) has a bulk density of 2.9m3, compressive strength of 215.6MPa, and flexural strength of 26.3MPa. Its chemical composition includes 45.2% silicon dioxide, 2.31% titanium, 14.02% aluminum, 5.59% ferrous oxide, 6.67% magnesium oxide, 8.64% calcium oxide, 9.43% sodium oxide, and 1.77% aggregate. The main data for aggregate inspection is aggregate crushing (%), 8.9% water absorption rate (%), 0.6% adhesion to asphalt, 2.0 wear value, Los Angeles (%), and 8.2% basalt continuous fiber short cut yarn, which is a product made by cutting basalt continuous fiber strands. Fibers are coated with wetting agents such as silane as needed. Adding concrete or mortar can effectively control micro cracks caused by factors such as plastic shrinkage, dry shrinkage, and temperature changes in concrete (mortar), prevent and suppress the formation and development of cracks, greatly improve the crack resistance, impermeability, impact resistance, and seismic resistance of concrete. Currently, it is widely used in fields such as highways, airports, ports, tunnels, bridges, reservoirs, water tanks, basement engineering, concrete pavement, subways, civil defense engineering, etc. Basalt continuous fiber is a high-performance fiber produced from pure natural volcanic rock raw materials, without any artificially formulated or synthesized additives or auxiliary materials, after high-temperature melting. Basalt is a high-performance volcanic rock component, and this special silicate gives basalt continuous fibers excellent chemical resistance, especially alkali resistance. Basalt continuous fiber is a pure natural and environmentally friendly product with excellent thermal stability (high and ultra-low temperature resistance); Excellent chemical stability (acid and alkali resistance, waterproof, low temperature absorption, radiation resistance), excellent physical properties (high strength, electrical insulation); Due to the above characteristics of basalt fiber, it is widely used in fiberglass reinforced plastic (FRP) reinforcement, fire and insulation fields, infrastructure fields, environmental protection fields, etc., and can replace carbon fiber in a considerable number of fields. Therefore, basalt continuous fiber is an excellent material to replace polypropylene fiber (PP), polyacrylonitrile (PAN) and other materials used to enhance cement concrete; It is also a competitive product that replaces polyester fibers, lignin fibers, and other materials used in asphalt concrete, which can improve the high-temperature stability, low-temperature crack resistance, and fatigue resistance of asphalt concrete. The relevant procedures for basalt mining projects need to be handled by the local land department, and do not need to go to the higher-level land and resources department. There is no limit to the mining area of basalt.