Ultrafine quartz powder is a high-quality, neutral inorganic filler. Due to its strong acid resistance, stable physical and chemical properties, good light transmittance, high dielectric strength, moisture resistance, radiation resistance, excellent high-temperature performance, high purity with low ion content, low expansion, and low stress, it is widely used in plastics, coatings, paints, rubber, ceramics, inks, catalysts, and gas filtration materials. In high-tech industries, ultrafine quartz powders require very strict standards for purity, particle size, and particle size distribution. Currently, advanced grinding technologies for natural quartz include ball mills, stirred mills, jet mills, vibration mills, and various classifiers. Key methods for ultrafine quartz grinding are as follows:
1. Quartz Pretreatment (Calcination + Water Quenching)
Quartz has a hardness of 7. Direct grinding methods used for other minerals result in high energy consumption and low efficiency. Therefore, thermal pretreatment is recommended via calcination and water quenching:
- Calcination: Heat quartz to 900–1150℃ to expand its internal structure.
- Water Quenching: Rapidly cool with water, creating numerous microcracks from thermal expansion and contraction, reducing quartz strength and improving subsequent grinding efficiency.
Avoid water-pool quenching, as water vapor bubbles form on the quartz surface, reducing rapid cooling efficiency.
2. Ball Mill Production of Ultrafine Quartz Powder
Ball mill combined with classifier lines is suitable for ultrafine quartz processing, providing high whiteness, good luster, stable quality, and controllable particle size.
- Equipment Matching: Ball mills and classifiers often have different focuses and are produced by different manufacturers. Improper matching reduces efficiency and increases energy consumption. Proper configuration ensures complementary advantages and high efficiency.
- Wear Protection: Quartz is hard and highly abrasive. For electronic-grade high-purity quartz powder, all static parts and chambers should use ceramic or wear-resistant linings. Ball mills commonly use alumina liners or stone balls.
3. Vibration Mill for Ultrafine Quartz Powder
Vibration mills are low-noise, compact, lightweight, energy-efficient, high-yield, pollution-free, and produce concentrated particle sizes. They produce electronic-grade ultrafine quartz powder with near-spherical morphology.
- Lining & Media: Typically use alumina lining and alumina media balls.
- Key Parameters: Vibration frequency directly affects grinding efficiency, equipment wear, and energy consumption. Adjust classifier impeller blades, impeller speed, suction fan pressure, airflow, and secondary air grid size to control particle size distribution and yield.
4. Jet Mill for Ultrafine Quartz Powder
Jet milling is one of the most widely used ultrafine grinding techniques. Using fluidized-bed jet mills, d95=10μm and d97=6μm products can be obtained via cyclone separators and pulse bag filters.
- Critical Factors: Classification current, feed size, and classifier wheel speed affect grinding efficiency and particle size control.
5. Use of Grinding Aids in Quartz Ultrafine Milling
Proper grinding aids improve efficiency and act as dispersants to prevent agglomeration. Common aids include polyacrylamide, sodium chloride, silicates, triethanolamine, and sodium dodecyl sulfate.
- Usage Guidelines: Amount must be controlled; excessive addition can reduce grinding efficiency. Effectiveness increases with dosage until an optimum is reached, then further increase decreases performance.
Conclusion
Key to producing ultrafine quartz powder lies in material pretreatment, proper equipment selection and matching, process parameter control, and wear protection. By using calcination-water quenching pretreatment, ball mill or vibration mill grinding, jet mill refinement, and grinding aids, producers can achieve high yield, energy efficiency, high purity,
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— Posted by Emily Chen
