MANUFACTUEE OF SUPEEPHOSPHATE. 



95 



•separator, generally placed above the eqUI. In this air separator, 

 the fine flour is separated from the grains by means of a current 

 of air produced in the machine itself and circulating there. The 

 machine has only three orifices, the feed entrance, and the exits for 

 the granular material, and for the flour. It requires neither sieve, 

 dust chamber, nor auxiliary apparatus of any kind. The separator is 

 shown in section in Fig. 10. The machine is constructed of wrought- 

 steel, and consists of a cylindrical envelope with exterior cone and 



v;(.'.yi'*«iift;i- 



Fig. 11. — Perspective view of Pfeiffer's Crusher- Separator. 



an interior cone arranged at a certain distance from the other. 

 The ventilator g is driven by the shaft /. On the same shaft, 

 below the ventilator, are two plates, b and d, which receive the 

 material from the feed funnel a. In consequence of the rotation, 

 the distributors y project the substance in all directions, and the 

 current of air produced by the ventilator passes from below, up- 

 wards. The force of the current raises the fine particles and 

 carries them in its train through the ventilator, and projects them 

 against the exterior side, whence they fall into the exterior cone 



