1results about How to "Shorten pickling time" patented technology

This invention discloses a method and product for purifying low-impurity quartz sand, relating to the field of quartz sand purification technology. The method includes: Step 1: Crushing and screening to obtain pretreated pure quartz sand; Step 2: Calcination-water quenching to obtain lattice-activated quartz sand; Step 3: Magnetic separation to obtain deeply purified quartz sand; Step 4: Ultrasonic-flotation synergistic treatment to obtain purified quartz sand; Step 5: Pressure acid leaching to obtain deeply purified quartz sand; Step 6: High-temperature chlorination and inert atmosphere cooling to obtain chlorinated purified quartz sand; Step 7: Dehydroxylation treatment to obtain dehydroxylated quartz sand; Step 8: Plasma purification to obtain a low-impurity quartz sand product with a purity ≥99.9999%. In this invention, pressure acid leaching directly acts on the surface and inside microcracks, allowing for faster acid penetration and more thorough dissolution. This synergistic effect of flotation and acid leaching increases the product purity from 99.78% to over 99.9999% with the same acid consumption.