The "Purification Code" of High-Purity Quartz Sand: The Complete Process of Production Line Revealed

High - purity quartz sand, as a key basic material in high - tech industries such as electronic information and photovoltaic energy, has extremely high requirements for indicators like purity and particle size distribution in its production process. A complete high - purity quartz sand production line requires the collaborative operation of multiple precise processes to convert natural quartz raw materials into products that meet high - end application standards.

The starting point of the production line is raw material selection. Natural quartz mines are often mixed with impurities such as feldspar, mica, and iron oxides. Therefore, it is necessary to strictly screen quartz raw ores with a purity of more than 99%. The selected raw materials first enter the crushing process. Large pieces of quartz ore are crushed into particles with a diameter of about 50 millimeters by a jaw crusher, and then further refined to 5 - 10 millimeters by a cone crusher, laying the foundation for subsequent processing.

The crushed quartz particles then enter the scrubbing and desliming process. In a high - speed stirring scrubber, the mutual friction between particles combined with water flushing can effectively remove impurities such as clay and fine mud attached to the surface. After desliming, the materials are classified by a vibrating screen, and the particles with unqualified particle sizes are returned to the crushing process for reprocessing.

Next is magnetic separation for iron removal, which is one of the key steps to improve purity. When the materials pass through a high - magnetic field magnetic separator, iron - containing magnetic impurities will be adsorbed and separated. After multiple magnetic separations (usually 2 - 3 times), the iron content can be reduced to below 10ppm. For scenarios with higher requirements, a flotation process needs to be introduced. By adding specific collectors and adjusting the pH value of the pulp, non - quartz impurities are attached to the surface of bubbles and float out, thus achieving deep purification.

The purified quartz particles enter the acid pickling process, which is the core process for removing non - metallic impurities. The materials are placed in a mixed acid solution of hydrofluoric acid, hydrochloric acid, etc. Under heating and stirring conditions, the acid solution reacts with and dissolves metal oxides such as aluminum, calcium, magnesium, and silicate impurities. After multiple acid pickling and rinsing with clean water to neutral, the impurity content can be controlled within 5ppm.

The materials after acid pickling need to be dehydrated and dried. Most of the water is first removed by a vacuum filter, and then sent to a hot - air dryer to be dried at a temperature of 120 - 150℃ until the moisture content is less than 0.5%. The dried quartz sand enters the fine grinding stage. According to different application requirements, it is ground to a specific particle size (for example, electronic grade products often require a particle size of 1 - 5 microns) by a ball mill or an air flow mill, and at the same time, the particle size distribution is ensured to be uniform through classification equipment.

Finally, high - temperature calcination and cooling and packaging are carried out. In a high - temperature furnace (usually at a temperature of 1000 - 1200℃), trace organic impurities in the quartz sand are completely decomposed and removed, and the crystal structure is further stabilized. The calcined products are cooled by a cooler, then sealed and packaged by an aseptic packaging line, and finally form high - purity quartz sand products that can be directly used in high - end manufacturing fields.

The entire production line realizes precise control of each link through an automatic control system. From the entry of raw materials to the delivery of finished products, key indicators such as purity and particle size are monitored throughout the process to ensure that each batch of products meets strict quality standards, providing solid material support for the development of high - tech industries.