High-purity silicon powder has good insulation, low thermal expansion coefficient, and chemical stability. It is widely used in semiconductor raw materials, silicon resin raw materials, solar cell substrates, optical glass electronic packaging materials, etc. Using quartz sandstone as raw material, the preparation of high-purity silica powder through ball milling, wiping, magnetic separation and other beneficiation and purification processes is of great significance to the development and utilization of quartz sandstone.

Mineral composition: The volume fraction of single crystal quartz in the quartz sandstone is above 95%, the sorting and rounding degree is good, the quartz is in the shape of other shapes, and the particle size is mainly concentrated in the range of 0.05-0.2mm. There are gangues in the cracks. The mineral deposit is filled with a small amount of clay matrix between the particles.

Chemical composition: The purity of SiO2 in this quartz sandstone is 99.47%. The main impurities with higher content are Al2O3, Fe2O3, TiO2, K2O, CaO, MgO, and the sum of the six main impurities reaches 0.0603%.

If the quartz sandstone is directly ground and used, the SiO2 content of the product can only reach the level of ordinary silica powder. It is necessary to reduce the content of other impurity elements through related processes before it can be used for insulation casting of electrical components and high voltage appliances, epoxy resin potting, etc. Occupation.

Quartz sandstone micro-domain composition analysis: Quartz sandstone is mainly composed of fine quartz crystal grains with a particle size of 20-30μm. The ore contains impurities such as Al, K, P, Ca and Ce, which may occur in phosphate deposits or clay In the mineral deposit, it can be dissociated from the quartz crystal grains through the ball milling and wiping process.

The above is how to prepare high-purity silica powder from quartz sandstone described by the editor? A brief description is expected to help everyone understand the silica powder, the content is available for reference, and those who need inquiries and understanding can contact our manufacturer.