May 22, 2021

How to prepare high purity silica micro powder from quartz sandstone?

High purity silicon powder has the characteristics of good insulation, low thermal expansion coefficient and high chemical stability. It is widely used in semiconductor raw materials, silicon resin materials, solar cell substrates, optical glass electronic packaging materials, etc. Silicon powder is usually made of natural quartz or fused quartz by crushing, purification, grinding, grading and other processes. It is of great significance to develop and utilize quartz sandstone to prepare high purity silica micro powder by ball milling, scrubbing and magnetic separation.
silica micro powder
Analysis of quartz sandstone
The mineral composition and chemical composition of quartz sandstone were analyzed from a place.
Mineral composition
The volume fraction of single crystal quartz in the quartz sandstone is more than 95%, the sorting roundness is good, the quartz is heteromorphic granular, the particle size is mainly concentrated in the range of 0.05-0.2mm, the fracture is filled with gangue minerals, and there is a small amount of clay matrix between the particles.
quartz sandstone
Chemical composition
The purity of SiO2 in the quartz sandstone is 99.47%, and the impurities with high content are Al2O3, Fe2O3, TiO2, K2O, Cao and MgO, and the sum of these six impurities reaches 0.0603%.
If the quartz sandstone is used directly, the SiO2 content of the product only reaches the ordinary silicon powder level. Only by reducing the content of other impurities through relevant processes can it be applied to the insulation pouring of electrical components and high voltage electrical appliances, epoxy resin sealing and other industries.
Analysis of micro composition of quartz sandstone
Quartz sandstone is mainly composed of fine quartz grains with the size of 20-30 μ m. The ore contains Al, K, P, CA, CE and other impurity elements, which may occur in phosphate minerals or clay minerals, and can be dissociated from quartz grains by ball milling and scrubbing process.
quartz sandstone
Preparation of high purity silica powder from quartz sandstone
Process conditions
silica micro powder processing
The - 0.212mm quartz sand was obtained by jaw crusher crushing and screening, and the magnetic minerals and impurities in the quartz sand were preliminarily removed by dry high intensity magnetic separator (1.0T).
After ball mill scrubbing and grinding, the quartz sand is ground to a reasonable size, and the iron film and clay minerals on the quartz surface are removed by scrubbing. The ball mill speed is 600r / min, pulp concentration is 50%, grinding time is 80 minutes. The content of SiO2 in fine sand increased to 99.76%, the whiteness increased from 52.7% to 86%, and the content of impurities decreased.

 After ball milling and scrubbing, the residual impurities in silica powder need to be treated by acid leaching. The acid content is 12%, the mass ratio of oxalic acid, sulfuric acid and hydrochloric acid is 2.5:3.75:3.75, the liquid-solid ratio is 3ml / g, the temperature is 50 ℃, the ultrasonic acid leaching treatment is 2h, drying and dispersing to obtain high-purity silica powder.

Composition analysis of high purity silicon powder
After crushing, screening, magnetic separation, ball milling, scrubbing and pickling, the high purity silica powder is obtained: SiO2 99.95%, Al2O3 0.0038%, Fe2O3 0.0019%, K2O 0.0008%, TiO2 0.0054%, CaO 0.0024%, MgO 0.0009%, whiteness 87.5%, which can fully meet the requirements of electrical grade silica powder.
There are few raw materials that can directly produce high-purity silica powder, so it is very important to prepare high-purity silica powder from quartz sandstone for the development and utilization of quartz sandstone resources.

For information about high purity silica sand and silica micro powder processing, please visit Sinonine Website , or directly us directly by +86-18118821087(Whatsapp).

Lasted news & technology
Jul 09 2021

In this paper, the processing of photovoltaic glass ultra silica sand is introduced in detail. The Fe2O3 in silica sand is reduced to less than 90ppm by flotation with common quartz sand as raw material to meet the quality requirements of ph

Jun 26 2021

This article describes a sand washing plant for low expansion foundry sand.

Jun 24 2021

The sinonine team has invented sand washing plant of removing iron from quartz sand through continuous exploration.

Jun 15 2021

The season of continuous spring rain will still have a serious impact on the production of quartz sand.

Jun 10 2021

In the sand washing plant, if we want to produce high-purity quartz sand, we need to choose the right raw materials, so how to determine the raw materials of high-purity quartz sand?

Jun 07 2021

Due to its superior properties, spherical quartz powder is widely used in high-tech fields such as integrated circuit copper clad laminate, epoxy plastic sealant, aerospace, fine chemical industry and daily cosmetics.

Jun 05 2021

Therefore, most of the colored quartz sands we see on the market are artificially dyed.

Jun 03 2021

ICP detection technology is an important support and component of high purity quartz technology, which has not only practical significance but also theoretical significance to promote the development of high purity quartz technology in China

Contact us

Thank you for your interests in Sinonine, Please feel free to submit your inquiry information to us, our expert will contact with you as soon as possible.