Document gajzRgBrDqx78Y0wneyo0vQzq

-24- agitated with air and steam. It is then dumped into thickeners, washed, and deliver ed to an Oliver filter. From there it goes in turn to a pug mill, drying tower, cage and imp mill, and classifier. The finished product is placed in a bin where it is put into fifty pound Bates Valve paper bags by means of a Bates Bag Packer. It is shipped in railroad box cars, each having a capaoity of from 1600 to 2000 bags. The three grades of "Filtrol" in greatest demand are* ; GRADE (Per cent, thru 200 mesh) 85 - 88 75 - 88 90 - 93 Per cent, of Total Production 80 15 5 Coarser Than 200 Mesh 14.0# 23.0# 8.0# 200 - 325 Mesh 16.0# 24. 0# 23. 0# Finer Than 325 Mesh 70.0# 53.0# 69.0# The only real dust producing operations in the production of Filtrol are the filling, stacking and handling of the fifty pound bags. Samples of dust taken during, these operations revealed the following* Operation Particles per cu ft. Average dust filling bags with 85-88 grade " " packing room while filling bags " 11 produced in handling of filled bags 10,416,096 9,572,180 5,845,248 An exhaust system has been installed to reduoe and control the dust produced during the packing of Filtrol. This consists of a metal hood above the filling tubes in front of the machine, with a basin below. A seven-inch duot leads from the basin and a six-inch duct to a canopy in back of the packer, both connecting with a teninch main duct vhioh runs to a Sturtevant Fan (1750 R.P.M. ) designed to handle 1,620 cubic feet of air per minute against four-inch water static pressure. A cyclone dust collector removes the larger particles from the air before delivering it to a tubular cloth dust collector. About sixty per cent, of the dust partioles of samples taken during the fil ling operation are slightly angular crystalline in appearance under the Konimeter mi croscope, and are about two microns or less in size; approximately twenty per cent, appear to be rounded orystalline, glaBS-like, but with rather smooth edges, and over ten microns in size. There are a large number of very small gray partioles (about twenty per cent.) too minute and too numerous to oount accurately. What is the Chemloal Composition of "Filtrol*1? Below is the result of an an alysis by a commercial chemical laboratory in Los Angeles, California, of a sample of Filtrol from the Jackson (Mississippi) plant-: Per Cent. Silica (Si02).................................................. Alumina (A1203).............................................. Ferric Oxide (Fe203)......... Titanium Oxide (Ti02)................................... Calcium Oxide (CaO).............................. Magnesium Oxide (MgO).............. Manganese Dioxide (MnOg)........................... .. Carbon Dioxide (C0;>)..................................... Potassium Oxide (K2O)................................... 56.90 13. 97 1.44 0.10 2.82 3.55 0.03 E PO 0151A