Facts & Figures Book - KPI-JCI

COARSE MATERIAL WASHERSPurpose: The coarse material washer is used toremove a limited amount of deleterious material froma coarse aggregate. This deleterious material includesshale, wood, coal, dirt, trash and some very solubleclay. A coarse material washer is often used as finalwash for coarse material (typically -2 1 ⁄2” x + 3 ⁄8”) followinga wet screen. Both single and double spiral unitsare available depending on the capacity required.Design: The coarse material washer consists of along vertical sided trough or tank of all welded constructionset at a 15° incline. The shaft(s) or spiral(s) ofa coarse material washer begin with one double pitchspiral flight with replaceable ni-hard outer wear shoesand AR steel inner wear shoes. Following this singleflight is a variable number of bolt-on paddle assemblies.Standard units include four sets of paddle armswith ni-hard tips. Two sets of arms replace one fullspiral. The balance of the spiral(s) consists of doublepitch spiral flights with replaceable ni-hard outer wearshoes and AR steel inner wear shoes.Washin g/Classifyin g103