Difference between Dry Ground Mica Powder and Dry Mica Powder

Dec. 05, 2019

Mica powder is a non-metallic mineral, which contains a variety of ingredients, including SiO2, which is generally about 49% and Al2O3 content about 30%. Mica powder has good elasticity and toughness. Insulation, high-temperature resistance, acid and alkali resistance, corrosion resistance, strong adhesion and other characteristics, is an excellent additive. It is widely used in electrical appliances, welding electrodes, rubber, plastics, papermaking, paints, coatings, pigments, ceramics, cosmetics, new building materials and other industries. With the continuous development of science and technology, people have opened up new application fields.

Identification of Wet Ground Mica Powder and Dry Ground Mica Powder In order to properly use mica powder, the industry often needs to identify the intrinsic quality of mica powder. Although the particle size, whiteness and moisture of mica powder are easy to determine, the identification of morphological characteristics and mica purity of mica powder has become a headache for manufacturers. Qualified enterprises can use elemental analysis (such as X-ray fluorescence analysis) to determine the content of various elements and determine the purity of mica; use a particle size analyzer (such as Coulter particle size analyzer) to measure important data such as particle size distribution and specific surface area, and determine the form学 traits. However, it is difficult for general factories to meet these requirements.

The morphology of dry method and Wet Ground Mica Powder is very different. Based on their morphological differences, several methods for simple identification of dry and wet mica powder are introduced:

1. Settling method: Take a 10ml graduated cylinder, add 1g of mica powder, add 5ml of water, shake well, then add water to the 10ml mark and shake well. Observe the sedimentation speed at rest. Dry mica powder usually settles to the bottom in about 60 minutes, forming about 7ml of the upper layer in the night. In contrast, wet mica powder usually only forms about 1.5-3ml upper clearing night, and it takes several hours to form about 7ml upper clearing night. The principle is that the wafer of the wet process mica powder is very thin and has good suspension characteristics, while the wafer of the dry process product is thick and contains more quartz powder, which has poor suspension characteristics.

Sericite Mica

Sericite Mica

2. Density method: The principle is that the wafer of the wet mica powder is very thin, and it is difficult to form a tight pile.

a. Bulk density method: fully disperse the powder, pour it into a graduated cylinder to a certain scale, weigh it, and calculate the density. The bulk density of wet mica powder is usually around 0.25g / ml, while the dry mica powder usually reaches 0.5g / ml.

b. Solid density method: Pour the powder into a weighing cylinder that has been weighed, weigh, and vibrate (such as tapping lightly on a table) to reduce the volume of the powder until the volume of the powder no longer decreases (usually about 10-15 minutes). Calculate the density. The solid density of wet mica powder is usually about 0.50g / ml, and the dry mica powder is 0.70-0.80g / ml.

3. Pearlescent effect: Take about 0.1-0.2g of powder, put it in colorless transparent glass, add about 60-80ml of water, and stir. Wet-processed mica powders can form noticeable pearlescence, while dry-processed mica powders have poorer pearlescence. Our company also has Sericite Mica on sale, welcome to consult.