Mance: Quarry Industry of Southern Indiana 



159 



economy in collecting and utilizing the waste heat from the cooUng lime. 

 By the introduction of a small jet of steam underneath the grate bars in 

 connection with this hot air, there is an excellent force draught for coal." 



The Keystone Ume kiln made on the Broomell patents is another popular 

 steel-clad kiln built on a somewhat different plan from the Shoop kiln. The 

 supporting base of the kiln is heavy steel, reinforced by vertical, double- 

 angle iron posts. . . . The steel-cooling cone ^^ithin the supporting 

 basal cylinder is made of heaw boiler plate suspended from a heavy cast-iron 

 bed plate and can be readily removed for repairs. At the bottom of the 

 cooling cone are patented draw gates opened and closed by hand wheels 

 which project outside of the supporting base so that the workman can turn 

 the gates ^-ithout coming in direct contact with the hot lime and dust. 

 The heat for the kiln is generated in 4 independent furnaces, each 24 inches 

 ^^-ide, 30 inches high, and about 4 feet long. The furnaces can be used ^^^th 

 forced draught under the grate bars by forcing a mixture ot steam and hot 

 air through an inserted steam pipe. . . . Induced draught is obtained 

 by using an iron cover with a door and attaching a suction fan to the top of 

 the kiln. 



The shell of the kiln is composed of hea\n,' steel plates bolted together, 

 and the interior is lined with fire brick supported by common brick. Near 

 the top of the kiln ... is placed a heavy steel cone to protect the 

 brick, and above this cone is a large storage space, the full diameter of the 

 kiln. The rock is heated in this space by the heat passing through the l;iln, 

 and its temperature is gradually raised as the rock passes down to the burn- 

 ing zone. 



These kilns are usually placed in a row or battery \\ith 3 feet of space 

 between them, and any kind of fuel may be used. The most popular size 

 kiln is the No. 3 which is described as follows by the company: 



Diameter of shell outside 113/^ feet. 



Diameter of brick lining inside 63^ feet. 



Diameter of cooling cone at the top 7 feet. 



Diameter of cooling cone at the bottom 2 feet. 



Height of coohng cone 7 feet. 



Total height of kiln 48 Peet. 



Shipping weight of kiln 44,000 pounds. 



Weight of special brick 14,800 pounds. 



Fire brick required 8,463 pounds. 



Common red brick 15,700 pounds. 



Capacity 90 to 140 barrels (200 pounds) per 24 hours. 



The O'ConneU kiln patented in 1899 has boilers set in the arches of the 

 kiln, and the fire box of the furnace opening into the body of the kiln supplies 

 the necessary heat for the kiln and also provides a means whereby steam 

 generated in the boiler may be used to aid combustion. By this plan the 

 fuel used for burning lime produces also steam to run the blowers and con- 

 veyors, elevate the stone, and operate quarry pumps and other necessary 

 machinery. It is claimed to save 20 per cent of the fuel ordinarily used for 

 burning the lime. 



The horizontal circular kiln invented by Hoffman, used especially for the 

 manufacture of brick in Europe, is also used for biu-ning lime. 



