Let's talk about the raw material processing and purification of silicon powder:

my country is rich in siliceous raw material resources, including crystal, translucent and milky veined quartz, metamorphic quartzite, sedimentary quartz sandstone, marine sedimentary quartz sand, river-lake sedimentary quartz sand, silt quartz and other types. With the large-scale development and utilization of siliceous raw materials, high-quality siliceous raw materials are gradually reduced; in order to meet the requirements of raw materials for silicon micropowder whose output is increasing year by year, some siliceous raw materials must be purified to meet quality standards before they are used to process silicon. Micropowder.

Mineral beneficiation and purification generally involves crushing, sieving, and grinding siliceous raw materials with high impurity content to fully dissociate silicon dioxide from impurities, and then removing impurities through magnetic separation and flotation; then pickling is used to make impurities further Then use clean water to wash away the acid solution, and then use deionized water to wash away the residual impurity ions adsorbed on the surface of the particles, so that the raw material meets or exceeds the chemical index of the silicon powder; after drying, it becomes the raw material for processing the silicon powder.

The high-quality fine powder produced by the processing of silica sand for glass in my country and the southern powder quartz can be used as raw materials for silica powder. In actual production, it is purified according to the required quality. Either through flotation, magnetic separation to remove impurities, or through water washing and classification to remove impurities, or through acid washing to remove impurities, and after drying, it is used as the raw material of silicon powder. For example, powder quartz with better quality, after being mined, is washed with water and classified to remove coarse particles and impurities, and dried at the fine particle level, it can be used as a raw material for the production of alkali-free glass fiber.

Fused silicon powder is also called amorphous silicon powder or amorphous silicon powder. The raw material of fused silica powder produced by crushing, grinding and classification methods is fused quartz. The production process of smelting quartz: first crush the siliceous raw material into small pieces of 10-20mm, adopt the accumulation acid leaching method to remove the surface impurities, and then rinse with water and dry. Put the clean and dry small material into the smelting quartz furnace, turn on the silicon carbide rod power supply; after smelting at high temperature (1 800-2 000 ℃) for about 10 hours, it will be quenched and broken out of the furnace, selected by hand, and then purified, pickled and removed. It is washed with acid and deionized water, and then becomes the raw material of amorphous silicon powder after drying. It is worth noting that if the siliceous raw material contains high liquid or gas inclusions, it is not suitable to be used as the raw material for smelting quartz.

The above is a brief introduction to the raw material processing and purification of silicon micropowder. You can simply understand it. The content is for reference only, you can contact us if you need to know about it.