- The Sturtevant Powderizer®, a “classifying impact mill” capable of reducing powders to less than ten microns, is fast becoming the workhorse in particle size reduction applications. Due to its independently driven impact milling and air classification technologies combined in one unit, it can produce a consistent product despite variable feed conditions. Further, it can produce several different products from the same feed with simple “dial in” adjustments. In addition, the Powderizer® is able to process heat sensitive materials making it ideal for chemical, food, pharmaceutical as well as mineral applications.
How it works: A feed tube conveys material into the grinding chamber, where it is pulverized by impactors that are fixed to a high-speed rotor disk. The pulverized product is then swept upward in a column or air and exposed to an independently driven classifying wheel.
The air flow, created by the system exhaust fan, pulls the fine particles through the rotating classifier, while rejecting oversize particles. The oversize particles are thrown to the inside of the zone divider and directed back into the path of the impactors for additional reduction.
Particle size is easily adjusted by increasing or decreasing the classifier speed, without mill shutdown. Other system parameters are easily adjusted to allow for tight control of product size on a variety of materials, for grinding and classifying to less than 10 microns.