Oversized particles in silica flour result in lower product efficiencies. Particle size distribution was the top priority, with rigid quality assurance that required a consistent product quality by limiting oversize particles in spite of variations in the particle size distribution of the ball-milled silica. The chosen air classifier had to withstand demanding performance requirements, and had to be versatile enough to produce a wide range of products. A fineness range of 200 to 325 mesh required a unit with quick external adjustments for maximum uptime.
The silica operation consulted with Sturtevant, a family-owned manufacturer with more than 130 years of service in the powder processing industry. Sturtevant recommended the high-efficiency Side Draft Air Classifier. The unit uses a multi- pin rejecter cage instead of whizzer blades. This configuration would ensure better control of large particle sizes and more efficient particle classification. As a quality control check, the operation set up a procedure to calculate the air classifier’s efficiency with mass balance which accounts for specific particle sizes in the classifier feed from the ball mill, and the finished product and the coarse material that is returned to the ball mill. Tracking the location of particles before and after classification enables a quantifiable analysis of classifier performance.
The Side Draft Air Classifier proved to be versatile enough to handle various products and the silica operation was extremely pleased with the consistent particle size distribution; their customer feedback indicated the high quality of the finished products. Shortly after successfully installing their first classifier, the client ordered three additional air classifiers.Click here fore related articles and newsSearch for manufacturers of air classifiers in our equipment guide
Sign up for Screening & Separation E-Updates
Recent Screening and Separation e-newsletters
Read our last “Screening and Separation” e-newsletter campaigns here:
Sturtevant, Inc. is the leading family-owned manufacturer of material processing equipment including its patented Micronizer® jet mill which produces sub-micron sized particles, Powderizer®an air-swept impact mill with integral classifier, Simpactor® and Infestroyer, centrifugal, pin-type impact mills and three types of high performance air classifiers ...