Optimization of Process Parameters for Silica Dioxide Rotary Flash Drying Equipment

Haomai Drying selected the XSG-800 type silica rotary flash drying equipment for the production of ordinary silica products. The product quality met the requirements and achieved good application results. However, when used for special silica products with a moisture content of ≤3.5%, the results were unsatisfactory, as the product moisture content failed to meet the requirements. Therefore, experiments were conducted to adjust the process operating conditions.

Import temperature of silica rotary flash drying equipment

To enhance the drying process and improve economic efficiency, the inlet temperature of the drying medium should be maintained at the **temperature** allowed by the material. The effect of inlet temperature on the moisture content of silica: as the temperature increases, the moisture content of silica decreases. Considering energy consumption and target requirements, the drying inlet temperature for ordinary silica products is selected to be 200–250°C. For the drying of specialty silica, increasing the inlet temperature results in a certain reduction in moisture content, but it fails to meet the moisture requirements. Moreover, in production, when the inlet temperature exceeds 250°C, the material is prone to overheating and agglomeration, and energy consumption increases. Therefore, the drying inlet temperature for specialty silica is selected as 250°C, with a product moisture content of approximately 5%.

The outlet temperature of the silica rotary flash drying equipment

The selection of the outlet temperature for a spin flash drying equipment entirely depends on the final moisture content requirement of the product. The outlet temperature of the drying medium is generally determined through actual measurement and is a critical parameter in the spin flash drying process, varying with changes in the inlet temperature and the drying process itself. The impact of outlet temperature on the moisture content of silica is such that as the temperature increases, the moisture content of silica decreases. For ordinary silica products, the drying outlet temperature is typically chosen between 100°C and 110°C. For the drying of specialty silica, increasing the outlet temperature results in a certain reduction in moisture content, but it still fails to meet the requirement of less than 3.5%. Moreover, during production, when the outlet temperature exceeds 140°C, the filter bags of the baghouse dust collector are prone to damage. Therefore, for the drying of specialty silica, the outlet temperature is selected at 110°C, resulting in a product moisture content of approximately 5%.

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