History From a revolutionary idea proposed and developed by Dr. Andrew Szegvari in 1945, Attritor technology became the basis for Union Process, Inc. Today, Attritors are considered to be the most efficient grinding/dispersing systems and are used in hundreds of industries and research laboratories worldwide. How Attritors Work The Attritor is often referred to generically as an “internally agitated high energy media mill.” The operation of an Attritor is simple and effective. The material to be ground is placed in a stationary tank with the grinding media. The materials and media are then agitated by a shaft with arms, rotating at high speed. This causes the media to exert both shearing and impact forces on the material. The final result of this remarkably efficient process is extremely fine material, measured in microns or fractions of microns, distributed on a very narrow curve. The Continuous Attritor The continuous Attritor is a compact vertical design suitable for continuous production of large quantities of materials. Premixed slurry is pumped through the bottom and discharged at the top of a tall, narrow jacketed tank with internally agitated grinding media. The fineness of the processed material depends on the time the material stays in the grinding chamber (“dwell” time). Dwell time is controlled by the pumping rate. The slower the pumping rate, the longer the dwell time and the finer the grind. The grinding media used in continuous Attritors range in size from 2mm to 10mm in diameter. Carbon steel, stainless steel, chrome steel and ceramic balls are commonly used media. Continuous Attritors can also be set up in series. This can be accomplished by using larger media in the first unit which is equipped with grids having larger openings for accepting a coarse feed size. Subsequent units then utilize smaller media, resulting in a finer grind. The Union Process Advantage From years of experience in designing and building thousands of Attritors for use all over the world, Union Process people have developed the “know how” to custom design the Attritor to specifically meet your requirements — whether in the lab or in the field. Union Process maintains a very well equipped laboratory and pilot plant in order to simulate actual production conditions. Skilled technical service representatives are always available for consultation. When required, a representative will visit the customer’s facility. Advantages of Using a Continuous Attritor n Continuous large production n Fastest grinding and processing n Excellent temperature control n Simple and safe to operate n Low maintenance and power consumption Common Applications for Attritors n Minerals, ores, coal n Paints, toners, inks n Ceramics n Food products n Chocolate, confectionery n Paper coatings, calcium carbonate, clay n Ferrites n Metal oxides n Agricultural flowables n Chemicals Union Process C/H Attritors Produce Large Quantities of Material Quickly and Efficiently On Cover: Model C-40 Continuous Attritor with pivot head design and media charging port. © 2012, Union Process, Inc.
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