June, 1921] 



Steel Moldiu<^ Sand iu Ohio 



259 



which the sand falls, a distance of about 35 feet. From the 

 drier the sand is conveyed by an elevator to a screen, where it is 

 separated into three sizes. The finest passes through a 20 

 mesh, the medium through a 16 mesh, while the coarsest 

 passes from the end of the screen. 



The 20 mesh, or finest sand^ is raised by an elevator to a bin 

 above the tube mill into which it runs. This mill measures 20 

 by 5 feet and has a "silica" lining. It is filled half full with 

 flint pebbles and rotated. The sand remains in this mill 

 about 45 minutes and is from 140 to 200 mesh fineness when it 

 emerges, the difference being dependent on quanity of sand in 

 the mill. The main use of this material, known as Silica 

 Wash, is for painting molds for steel castings; minor uses are 

 for soap, paint, and in rubber works. The market for this 

 product at present extends from Ohio to California. 



The medium sand (16 mesh) is used in glass. making and on 

 tracks to prevent slipping. The market for this is restricted 

 to Ohio. The coarsest material, or that which does not pass 

 through the screen, is used as steel blast sand. 



The sand which collects in the settling tank is used for steel 

 moldings. The ganister is reduced in the dry pan without 

 water and is shipped in that condition. 



The plant reduces about 175 tons of rock per day, except in 

 very cold weather, and the product is about as follows : 



Silica Wash 15 tons. 



Glass sand 80 " 



Steel blasting 5 " 



Steel molding 23^" 



Furnace bottoms 47 " 



Waste 25 " 



When the stripping is removed in the quarry the quantity 

 of waste will be very greatly reduced. 



Four samples of sand from this plant were analyzed and 

 the results follow: 



