7 ae 
STATE GEOLOGIS?. 299 
angen <2 # SEE 
re 
Location. z a3 2 5 : cH o 
a eas | of a EE 
S S8e aS a | qs 
= > fy < D O 
Peacock Mine, Pomeroy.....| 4.75 | 39.15 | 50.85 | 5.75 | 0.77 
Mimrensivalleme www auc cecuce oe B50) |) 40.U7 | 4b7/.89) | SNe fF UO 
SWRAGURG>cocccc8uscocvecce| DsOZe | B70 || Oily |) Dogo | boayy) 
Mineral; Athens Co., No. 6..| 6.80 | 36.90 | 48.25 | 8.05 | 2.14 | 6,794 
Continental Coal Co., Bren- | 
lol's) IN@s @oocscedosesce ZoBS || 34.08 | 52.57 | 5.85 | O70 | OSC 
N. Pittsburg Coal Co., Buch- | 
(Ga Rar ae ee a ae ee C45 | Bd.Ol | B2.73 | 4.81 | O60 | 7057 
Sand Run, Hocking Co., 6.. | 7.40 | S407 | GB.49 | 5.004 1.08) e027 
Continental Coal Co.,Glous- 
ter, No. 6.. Wo | BA 22 | S1.92 | 6.72 || 1.65 | OSes 
Continental Coal Co, ‘No. 6) 
Jacksomvall lene er yee 0% | B2,.88 | SB.G1 | G78 | O.90 | Gewow 
Coming, IN@s B,sococccccocel O79 | BO.4 | lsd |) HOw | WOO | Gos: 
Bird’s Run,GuernseyCo.No.6; 10.93 | 34.00 | 48.48 | 6.64 | 2.03 | 6,133 
Upson’s Mine, Shawnee..... LAO | BS. BO | Gl Be 4b A oe | OT 
Luhrig Mine, Athens Co....|_ 6.17 | 36.40 | 49.61 | 7.82 | 0.90 | 6,868 
Mioigs Greeks GoBllicooocsneos| BallB || BIG | SOMO | Goze | ww 
Fuel Consumption in the Rotary Kiln.—This is a large item and it 
is in this respect that the rotary kiln shows to its poorest advantage. 
S. B. Newberry has calculated the amount of coal required under 
different conditions, burning wet and dry mixtures, assuming that the 
cement has an average composition and requires a burning temperature of 
2500° I. The coal assumed to be used is Pittsburg coal with a calorific 
power of 13,400 B. T. U., requiring 10.2 pounds of air per pound of 
coal. The calculation is based on the barrel as a unit. 
Burning a dry mixture, a rotary kiln with the waste gases escaping at 
1500° I., and with theoretical amount of air, requires per barrel 628,902 
B. T. U. or 66.9 pounds of Pittsburg coal; with 50 per cent. air excess 
82.2 pounds of coal are needed. The actual amount of coal required in 
practice is 110 to 120 pounds per barrel. 
The rotary kiln fed with slurry containing 50 per cent. of water with 
gases leaving at 700° J’. requires per barrel, with theoretical air supply, 
120 pounds; with 50 per cent air excess, 128.7 pounds of coal. The 
amount of coal actually used is 150 to 160 pounds per barrel. | 
In these calculations the heat liberated by the chemical combina- 
tion between the silica, alumina and lime has been neglected. 
