Union Process, Inc. has built two twin S-400 Attritors. The wet grinding batch attritors were built for a customer grinding alumina. The customer’s throughput requirements dictated the need for these two large production mills. The starting size of the customer’s material was around 300 microns. Union Process was able to reduce the size of the starting material to as small as one to two microns in a very short time (especially when compared to a ball mill). Attritors are simple to operate, ve...