What is the core working principle of filter aids for candle filters?

The core principle of filter aids for candle filters is based on the unique physical morphology of the filter aid particles. They create a loose, porous support layer on the filter cartridge surface, altering the original filter cake's packing structure. Direct accumulation of fine solid particles easily forms a dense clogging layer with narrow pores that readily block the filter media channels. The introduction of filter aids reconstructs the pore system of the surface filtration structure.

Filter aid particles possess a stable skeletal structure. After adhering to the filter cartridge surface, they form a uniform porous support layer. Fine solid particles in the subsequent material are intercepted within the pores of the filter aid's skeletal structure, preventing them from directly adhering to the filter media surface. This layered interception mode avoids fine particles embedding into the filter media's internal pores, preventing deep clogging at the source and maintaining the filter media's permeability.

The loose filter layer created by the filter aid improves fluid permeability, slows the rate of flow resistance increase during filtration, and extends the effective filtration time. Meanwhile, this structure can uniformly accept the accumulation of solid impurities, making the filter cake layer loose and regular overall, and making it easier to detach the entire cake during the unloading stage, reducing residue residue. By reconstructing the filter layer structure, optimizing the pore distribution, and improving the filter cake characteristics, it is fully adaptable to solid-liquid separation conditions involving fine impurities.