Abstract: In this paper，a study of precoat filtration with cellulose filter aid added to high viscosity materials is presented. Different precoat filtration conditions greatly affect the filtration performance of a precoat cake layer. Specific resistance，compressibility coefficient and porosity of cellulose cake layer were studied by changing precoat pressure and concentration. Experimental results show that the specific resistance of cellulose precoat layer increases as pressure drop increases and decreases as concentration increases；the porosity of cellulose precoat layer decreases as pressure drop increases and increases as concentration increases；the compressibility coefficient of cellulose precoat layer increases as concentration increases. Cellulose filter aid is moderately compressible material. The cellulose precoat layer has high porosity. The results provide a reference for engineering applications of precoat filtration with cellulose added to high viscosity materials.

Key words: cellulose, precoat filtration, porosity, specific resistance, compressibility coefficient

摘要： 对高黏度物料加入纤维素助滤剂的预敷过滤性能进行了研究，说明不同的预敷条件对预敷层的过滤性能会有很大影响。通过改变预敷压力和浓度，对纤维素滤饼层的过滤比阻、可压缩性系数和孔隙率进行了研究。实验表明，纤维素预敷层的比阻随压力增加而增加，随浓度增加而减小；孔隙率随压力增加而减小，随浓度增加而增加；可压缩性系数随浓度增加而增加。纤维素助滤剂为中等可压缩性物料，孔隙率大。研究结果可为高黏度物料用纤维素预敷过滤的工程应用提供参考。

关键词: 纤维素, 预敷过滤, 孔隙率, 比阻, 可压缩性系数