High whiteness negative ion powder preparation technology

Tourmaline is a silicate mineral with a cyclic structure of sodium, magnesium, iron, aluminum, and lithium characterized by containing boron. It not only has good thermoelectric and piezoelectric effects, but also releases negative ions, radiates far-infrared rays, and is antibacterial. , deodorization and other functions, which are beneficial to humans and the environment. Among them, negative ions can adjust the body’s ion balance, activate cells, inhibit fungal infections, and improve the body’s self-healing ability; it can also absorb dust in the air and purify the air. Therefore, tourmaline has been widely used in many fields such as building materials, textile products and environment as a healthy and environmentally friendly negative ion releasing material, making great contributions to improving the quality of human life.

However, the whiteness of raw tourmaline ore is very low, which seriously restricts its application in the fields of building materials and environmental materials. Therefore, it is of great significance to improve its whiteness without affecting its negative ion release.

A research team has developed a method for preparing high-whiteness negative ion powder. This preparation method can convert low-whiteness tourmaline into high-whiteness, efficient negative-ion release, and non-radiation negative-ion powder, thereby improving the utilization value of tourmaline.

The preparation method includes the following steps:

(1) Ball-grind the tourmaline raw ore into tourmaline powder, mix the tourmaline powder, dispersant and water in a mass ratio of 1: (0.01~0.1): (0.8~1.5), and add an average particle size of 0.2mm~ 0.4mm grinding media, the mass ratio of the grinding media to tourmaline powder is (3~10):1, the grinding time is 150min~300min, and the grinding speed is 2000~3000 rpm;

(2) Add a surface modifier to the system. The mass ratio of the surface modifier to the tourmaline powder is (1~8):1. Continue grinding for 1~2 hours at a grinding speed of 2000~3000 rpm. After the reaction is completed, a high-whiteness negative ion powder slurry is obtained, and the high-whiteness negative ion powder is obtained by drying. The test results are that the whiteness is 65.63 and the negative oxygen ion release value is 779.

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