Applications of quartz sand dryer in photovoltaic industry

Under the background of global energy transition, the photovoltaic industry is experiencing rapid growth. Photovoltaic grade quartz sand is a key raw material for manufacturing solar panels, it is required that the SiO2 content greater than 99.9% and impurities such as iron, aluminum, and calcium content less than 0.1%. However, natural quartz sand has a high water content and many impurities, can't be used as photovoltaic grade quartz sand directly. Therefore, it must first be dehydrated and impurities removed. At this point, the quartz sand dryer is not just a drying machine, but also the "gatekeeper" to ensure the photoelectric conversion efficiency of photovoltaic panels.

Preparation of Photovoltaic Quartz Sand

Benefication: The photovoltaic industry has high requirements for the quality of quartz ore, it requires high silica content and low levels of impurities.

Crushing: Large pieces of quartz ore are crushed into smaller pieces using a crusher for later grinding.

Grinding: The crushed quartz ore is placed in a grinding mill and ground to a certain fineness(also called quartz sand).

Washing: The quartz sand is washed to remove surface impurities, this step ensures the purity and quality of the quartz sand.

Screening: The washed quartz sand is screened using a classifier to remove too large or small particles, thus obtaining quartz sand with uniform particle size.

Magnetic Separation: The screened quartz sand is then passed through a magnetic separator to remove impurities, meeting the requirements for photovoltaic quartz sand.

Drying: The qualified quartz sand is dried to reduce its moisture content. Industry data shows that when the moisture content of the finished product is below 0.3%, the yield of photovoltaic-grade quartz sand can typically be improved by about 0.5%–1.5% for every 0.1% reduction in moisture content.

The core function of quartz sand dryer

1. Controlling Moisture Content

Quartz sand dryers can control the moisture content of finished quartz sand to below 0.3%, meeting the moisture requirements of the photovoltaic industry.

2. Improving Finished Product Quality

The dried quartz sand particles remain loose, which helps improve grading accuracy and improves finished product quality. This is particularly important for the large-scale production of photovoltaic-grade quartz sand.

3. Ensuring Stability in Downstream Melting and Crystal Pulling Processes

During the melting of photovoltaic silicon materials and the manufacturing of quartz crucibles, residual moisture can cause bubbles, inclusions, and structural defects. Quartz sand dryers, through uniform dehydration, greatly reduce the quality risks caused by moisture, providing a stable raw material base for downstream high-temperature processes.

In the future, with the continuous development of the photovoltaic industry, the demand for quartz sand will continue to grow. Quartz sand dryer plays an important role in the photovoltaic industry and effectively controls product quality. For more detailed information about quartz sand dryer, please feel free to contact us.