Sil-Kleer filter aids are produced by subjecting a single ingredient, perlite rock (a naturally occurring volcanic glass), to a temperature in excess of 1500 F. Combined moisture within the rock vaporizes and the molten glass forms a multicelled bubble cluster, then it is milled to form amorphous-shaped particles.
Perlite filter-aids are used as a cost-effective replacement for other filter-aids, including diatomaceous earth, silica gels, and clays. They are used as both a precoat and body feed on pressure and vacuum filters of various designs, and also as a process aid for applications on pressure leaf filters, filter presses, pressure tube, pressure belt, vacuum belt, vacuum tube, and rotary vacuum filters.
Once the perlite is expanded at an extreme temperature, the relatively coarse aggregate is then milled and classified to strict specifications for particle size. The resulting particles are highly amorphous and exhibit a packing arrangement that is ideal for cake filtration. Our exfoliation process allows for separation and removal of other non-perlite volcanic glasses, i.e. obsidian, which lack the amorphous shape of the perlite and are non-filtering resulting in a superior perlite filter-aid.
Wine, beer, penicillins, cyclins, soy sauce, pickled fruits and vegetables
Enzymes/amino acids, bio-based chemicals, biological products, citric acid
Solvent recovery, waste water, cyclic crudes, dyes, pigments, disposal wells, completion fluids, inks
Sulfuric acid, inorganic and organic chemicals, chlorine, molten sulfur, gum and wood chemicals
Coolants and oils, plating baths, rolling mill lubricants, surface agent oils
Baghouse precoat for asphalt, cement kilns, foundries and steel mills, coke ovens
All analyses are shown in elemental form even though the actual forms present are mixed glassy silicates. Free Silica may be present in small amounts, characteristic of the particular ore body.
*By Food Chemicals Codex Method
|Fine/Slow Flow||Medium Flow||Coarse/Fast Flow||Air/Gas|
|Typical Filtration and Physical Characteristics||27-M||25-M||23-S||21-S||19-S||17-S||15-S||23-M||17-M|
|Flow Rate mL||300||550||750||950||1100||1300||1700||750||1300|
|Cake Density (lbs/ft3)||12.0||8.0||9.0||8.5||8.0||7.0||6.0||7.0||5.0|
|Mean Diameter (μ)||20 - 25||30 - 35||35 - 40||45 - 50||55 - 60||60 - 65||80 - 85||40 - 45||65 - 70|
|Size Range (μ)||5-120||5-140||5-150||5-180||5-200||5-300||5-300||5-200||5-300|
Due to the light weight, 20 to 50% density advantage, Sil-Kleer offers twice as much filtration, pound for pound, than diatomaceous earth. A Sil-Kleer filter cake density is only 7 to 12 lbs per cubic foot or a dry density range of 6 to 10 lbs per cubic foot. Sil-Kleer users can realize substantial savings in filtration operations with a better filter aid at less cost.