Common features of various filter aids, quality requirements and dosage

Commonly used filter aid charcoal powder, diatomaceous earth, chaff and pulp and so on.

Charcoal powder is made of wood fired charcoal and then processed by the black powder. Loose porous charcoal, particle approximation spherical, is conducive to filtration, a certain specific surface area, adsorption of colloidal impurities. The quality requirements of charcoal burning reduction should be> 90%, does not contain Fe2O3, MnO2, etc., so as not to reduce the trivalent titanium content of titanium liquid, the required fineness of 150 mesh sieve remnants of 2% per square meter filter area About 0. 5kg, filter press filter layer thickness of 1-2mm.

Diatomaceous earth is an ancient single-cell diatom microbial debris deposits, as a filter aid is a natural product or processed products, the main components of Si02, A12O3, Fe2O3, CaO, MgO, which Si02 content of about 80% -85%, good acid resistance, particle size of 20-150μm, the relative density of 2.1-2.5, a variety of colors, the most pure white, was opaque soil opaque luster, requiring fineness of 150 mesh, per square 0.5kg filter area, filter layer thickness of lmm.

Rice hull ash containing Si02 greater than 90%, active adsorption, composed of porous silicate material. The amount of use per square meter filter area using 1-2kg.