528 



CEMENTS, LIMES, AND PLASTERS. 



Pan conveyors, rolls, and sprinkling. At a number of plants the 

 hot clinker is caught, as it drops out of the kiln, in pan conveyors. As 

 it passes along in these it is sprinkled with fine jets of water, and at 

 some point of its progress is passed through a pair of rolls. This method 

 therefore, contains all the elements of any cooling system, and in a 

 very simple form. It is not adapted to utilize the heat of the clinker 

 however, and the product even after sprinkling and passing the rolls 

 is too hot to be sent immediately to the grinding-mills. The simplicity 

 of the method is therefore counterbalanced by a loss of heat and rela- 

 tively high amuont of hand-labor. 



Stationary tower coolers. Many plants use stationary coolers in 

 the form of towers. The Mosser cooler, shown in section in Fig. 131, 

 is a good example of this type. The cooling installation at the Buck- 

 horn plant is described as follows by Mr. Humphreys in Engineering 

 News : * 



Belt Conveyor' 



FIG. 131. Tower cooler, Buckhorn Portland Cement Co. .(Engineering News.) 



"Each pair of kilns discharges through a fire-brick-lined shute into 

 the boot of a single-chain open elevator. 



"As the clinker falls into the buckets of this elevator it is sprayed 



* Humphreys, R.L. The plant of the Buckhorn Portland Cement Co. Engi- 

 neering News, vol. 50, pp. 408-411. Nov. 5, 1903. 



