

HYDRATED LIME: ITS PREPARATION AND PROPERTIES 125 



plant using the Dodge process, the quicklime passes first through a 

 small crusher, which reduces it to about ^ inch. The product is then 

 fed to Sturtevant rock-emery mills, which reduce it so that about 80 per 

 cent will pass a 50-mesh sieve. 



A new rotary fine crusher, devised by the Sturtevant Mill Company, 

 has also been used for crushing hydrated lime to ^ inch or so. The fol- 

 lowing details regarding this crusher are taken from a recent catalogue. 



TABLE 43. 

 SIZES, CAPACITY, ETC., OF STURTEVANT CRUSHER. 



Mixing with water. The next step is the actual slaking, and here 

 considerable differences of practice appear, depending partly on what 

 particular patented process is followed. The mixing is commonly 



Lime enters this floor" 



Grinder or .Boiling Heel 

 or.Air Separator 



CrusheT Bin and Tank 

 to be supported securely 



FIG. 24. Ellis lime-hydrating system. 



carried on in a pan with agitators, similar to a familiar form of con- 

 crete mixer, or in a horizontal cylinder. All the lime may be added 



