Whiteness of kaolin quality identification

PTMS magnetic separation

What jobs use magnetic drum separator work?

The whiteness of kaolin is one of the quality standards of finished products and the largest reference for process performance. The kaolin with high purity is white. Kaolin whiteness is divided into natural whiteness and whiteness after calcination. For ceramic raw materials, the whiteness after calcination is more important, and the higher the whiteness of calcination, the better the quality.

There are two understandings of kaolin whiteness values:
1, natural whiteness value (heated to 105 degrees to maintain 30-120MIN and then compared with standard whiteness)
2, calcination whiteness value (heated to 1300 degrees to maintain 30-120MIN and then compared with the standard whiteness)

The ceramic process stipulates that the drying temperature of 105 ° C is the classification standard of natural whiteness, and the calcination of 1300 ° C is the classification standard of the whiteness of calcination. The whiteness can be measured by a whiteness meter. A whiteness meter is a device that measures the reflectivity of light at a wavelength of 3800-7000 Å (ie, angstroms, 1 angstrom = 0.1 nm). In the whiteness meter, the reflectance of the sample to be tested is compared with the reflectance of the standard sample (such as BaSO4, MgO, etc.), that is, the whiteness value (for example, the whiteness of 90 means 90% of the reflectance of the standard sample).

What is the way to improve whiteness?

The kaolin itself is white, and the iron impurities show rose red, brownish yellow, iron and titanium impurities will affect the whiteness of calcination.

The method of increasing the whiteness is obviously complicated.

High territory is mined and stirred into magnetic separation to remove iron impurities, thereby increasing whiteness