Tourmaline is the general name of tourmaline group minerals. Its chemical composition is complex. It is a cyclic silicate mineral of aluminum, sodium, iron, magnesium and lithium characterized by boron. [1] The hardness of tourmaline is usually 7 ~ 7.5, and its density is slightly different according to different types. Tourmaline is also called tourmaline, tourmaline, etc.

Application fields:

1. Water treatment

Because tourmaline has a permanent spontaneous electrode, the generated electrostatic field can adsorb heavy metal ions (Cu2 +, Pb2 +, Zn2 +, Cd2 +) and impurities in water, so it can be used in sewage treatment.

2. Jewelry raw materials

As a gem material. Tourmaline (tourmaline) is the most abundant mineral in color and tone in nature. Tourmaline is a crystal structure with unique cubic polar axis. Many isomorphic images appear in different crystallographic positions of tourmaline, resulting in extremely complex composition. Along the polar axis, with the change of chemical composition and the adjustment of crystal structure, the color of tourmaline crystal changes infinitely. There are 11 colors, including red, pink, yellow, blue, green, purple, Tan, colorless, coffee, red and black. The transitional sense of hue is strong.

3. Electromagnetic shielding material

Electricite can form anions with water molecules in the air and neutralize the cations emitted by radiation to prevent the propagation of electromagnetic waves. The shell is made of materials containing tourmaline powder, which has the function of electromagnetic shielding and eliminating static electricity.

4. Other

For the characteristic that tourmaline can produce negative ions, many people have used tourmaline for interior decoration and other building materials in recent years. Some scholars use tourmaline powder to make negative ion finishing agent, mix it evenly with kenaf and low melting point polyester, and melt blend to prepare automotive interior materials. Some scholars also add tourmaline to building materials, such as heat insulation board, brick and so on.