The application of precoated vacuum drum filters in polysilicon production is primarily manifested in their high-efficiency solid-liquid separation capability and the enhancement of polysilicon product quality.

A precoated vacuum drum filter is an improved version of the traditional vacuum drum filter, where a thin layer (typically a filter media or chemical coating) is applied to the surface of the equipment before use to improve filtration efficiency and extend equipment lifespan. The precoat effectively captures smaller solid particles, enhancing the removal of impurities.

During the production of polysilicon, a significant amount of solid particles and suspensions are generated. The precoated vacuum drum filter efficiently separates these solids from the liquid, ensuring the cleanliness of the polysilicon slurry and improving product purity.

Improved Filtration Efficiency: The application of the precoat enhances the filtration performance of the filter medium's surface, enabling it to capture smaller particles, thereby reducing the difficulty and cost of subsequent processing.

Reduced Clogging: The precoat evenly distributes across the surface of the filter medium, minimizing direct contact between solid particles during filtration, reducing clogging of the filter medium, and improving equipment operating efficiency.

Extended Equipment Lifespan: The presence of the precoat reduces wear on the filter medium caused by solid particles, extending the equipment's lifespan and lowering maintenance frequency and costs.

Automation and Continuous Production: Precoated vacuum drum filters often feature automated control systems, allowing for continuous feeding and discharging, making them suitable for large-scale polysilicon production lines and improving overall production efficiency.

Washing and Regeneration Function: The equipment can optionally perform filter cake washing to remove residual impurities, ensuring the quality of the final product. Furthermore, the equipment design allows for filter media regeneration, reducing operating costs.