The factors affecting a precoating filtration process and its regulation are studied through lab scale and pilot scale tests combined with surface-enhanced Raman spectroscopy. In the classic filtration process, the diatomite filter aids are introduced for precoating to regulate the specific resistance of the filter cake during the filtration process. This approach solves the fast termination of filtration caused by the rapid increase of the specific resistance of filter cake in classic filtration process. Moreover, surface-enhanced Raman spectroscopy is introduced to detect the trajectory of the filter particles moving with the filtrate in different precoating. The key factors, such as median particle size, thickness, and suspension mass concentration of precoating in the filter aids, are determined using lab scale and pilot scale tests. This study provides a foundation for industrial application of precoating filtration processes.

通过实验室规模和中试规模测试以及表面增强拉曼光谱研究了影响预涂层过滤过程及其调节的因素。在经典的过滤过程中，硅藻土助滤剂用于预涂，以在过滤过程中调节滤饼的比电阻。该方法解决了传统过滤工艺中滤饼比电阻快速增加所引起的过滤快速终止的问题。此外，引入了表面增强拉曼光谱，以检测在不同的预涂层中随滤液移动的过滤器颗粒的轨迹。关键因素，例如中值粒径，厚度和助滤剂中预涂层的悬浮质量浓度，是使用实验室规模和中试规模测试确定的。