Quartz stone beneficiation and purification process

The quartz stone beneficiation process is mainly purification, removing small amounts of or trace impurities in quartz sand, and obtaining refined quartz sand or high-purity quartz sand, which is a highly difficult separation technology. Today, the editor will share with you the quartz stone beneficiation and purification process.

1. Crusher: Use a jaw crusher to crush the quartz to 100-150 mm. Secondary Crushing: Use a cone crusher or impact crusher to further crush it to 20-50 mm.
2. Grinding: Use a rod mill or ball mill to grind the quartz to 1-5 mm. Fine Grinding: Grind it to 0.1-0.5 mm for subsequent sorting.
3. Ore Dressing
3.1 Jig Gravity Separation
Jig: Separates dense impurities such as feldspar and mica. Shaker: Further separates fine impurities.
3.2 Dry and Wet Magnetic Separation
Dry magnetic separation: Removes magnetic minerals such as iron. Wet magnetic separation: Used for fine-grained quartz to further remove magnetic impurities.
3.3 Flotation
Chemicals: Use collectors and frothers to separate quartz from feldspar, mica, etc. Equipment: Flotation machine. 3.4 Pickling
Acid: Use hydrochloric acid or sulfuric acid to remove metal oxides such as iron. Reaction:
Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O
Fe₂O₃ + 6HCl → 2FeCl₃ + 3H₂O
4. Purification
4.1 High-Temperature Calcination
Temperature: 800-1000°C. Purpose: Remove organic impurities and some volatile impurities.
4.2 Chlorination Roasting
Temperature: 1000-1200°C. Reaction:
SiO₂ + 2Cl₂ + 2C → SiCl₄ + 2CO
SiO₂ + 2Cl₂ + 2C → SiCl₄ + 2CO
Purpose: Remove impurities such as aluminum and iron.
5. Refining
5.1 Water Quenching
Process: Rapidly cool the high-temperature quartz to break it into small particles. Purpose: To facilitate subsequent processing.
5.2 Acid Leaching
Acid: Use hydrofluoric acid or a mixed acid. Reaction:
SiO2 + 6HF → H2SiF6 + 2H2O
SiO2 + 6HF → H2SiF6 + 2H2O
Purpose: Further remove impurities.
6. Product Processing
6.1 Drying
Equipment: Dryer. Purpose: Remove moisture.
6.2 Grading
Screening: Grading by particle size to meet different industrial needs.
6.3 Packaging
Method: Bags or bulk for easy transportation and storage.