Silica sand purification removes small or trace impurities to produce refined, high-purity, or ultra-high-purity silica sand.
Main purification methods include washing, classification desliming, scrubbing, magnetic separation, flotation, acid leaching, microbial leaching, and other deep purification processes.
Washing and classification desliming remove clay minerals, fine mud, iron-bearing impurities, and aluminum-bearing impurities before deeper purification
Scrubbing removes film iron, clay-bonded impurities, muddy minerals, and unliberated mineral aggregates from the quartz particle surface.
Magnetic separation, flotation, acid leaching, and microbial leaching further remove weak magnetic minerals, mica, feldspar, Fe, Al, Ti, Cr, and trace impurities.
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Quartzite Mining
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Silica Sand Processing
The process removes clay minerals, film iron, aluminum-bearing impurities, weak magnetic minerals, mica, feldspar, titanium, chromium, and other trace impurities to produce refined, high-purity, or ultra-high-purity silica sand.
The beneficiation route can be selected according to raw sand impurity type, product quality requirement, and purification cost, helping reduce unnecessary processing steps.
The line can be configured with automatic washing, classification, desliming, scrubbing, magnetic separation, flotation, acid leaching, microbial leaching, dewatering, and product collection systems.
The process can be customized for ordinary industrial silica sand, refined silica sand, high-purity quartz, optical glass sand, or ultra-high-purity silica applications.
Raw quartzite or silica sand enters the beneficiation process.
Scrubbing removes clay, surface impurities, and attached mud from the sand particles.
Hydrocyclone separates fine slime from the usable sand slurry.
Fine slime and unwanted mud are removed from the process.
The usable slurry is classified by particle size and density.
Slurry concentration is adjusted before flotation separation.
Iron-bearing impurity minerals are removed from the silica sand stream.
Heavy minerals are separated for independent treatment.
Remaining heavy mineral fractions are further classified.
Additional heavy minerals are removed for separate treatment.
The quartz slurry is prepared for the final flotation stage.
Quartz sand flotation separates feldspar from purified quartz sand.
Feldspar concentrate is collected as a separate product.
Purified quartz sand concentrate is obtained as the main final product.
Feldspar concentrate and quartz sand concentrate are discharged separately for downstream industrial use.
Get detailed flow diagrams, equipment specifications, and design guidelines
Scrubbing, desliming, magnetic separation, and flotation can improve quartz purity to 99.3%–99.9% for industrial silica sand applications.
Acid leaching supports deep purification and can produce high-purity quartz with purity up to 99.99% for strict quality requirements.
Rod-mill scrubbing can reduce Fe₂O₃ from 0.19% to 0.10%, achieving an iron removal rate of about 47.4%.
Chemical-assisted high-efficiency scrubbing can improve refined sand yield up to 73%, compared with lower yield from conventional rod-mill scrubbing.
Our experienced engineers can design a custom solution to increase your processing capacity and reduce operational costs
