18 BULLETIN 1226, U. S. DEPARTMENT OF AGRICULTURE. 
Table 13. — Blast furnaces fitted with dry cleaning plants — Continued, 
UNITED STATES. 
Type of plant. 
American Manganese Manufacturing Co., Dunbar, Pa. 
Bethlehem Steel Co., South Bethlehem, Pa 
Brier Hill Steel Co., Youngstown, Ohio 
Cambria Steel Co., Johnstown, Pa. 
Carnegie Steel Co. (Ohio works), Youngstown, Ohio... 
Carnegie Steel Co. (New Castle works), New Castle, Pa . 
Colorado Fuel & Iron Co., Pueblo, Colo 
Crane Iron Works, Catasaqua, Pa 
The Ford Co. (Inc.), Dearborn, Mich 
Lavino Furnace Co., Sheridan, Pa 
Edward E. Marshall, Harrisburg, Pa 
Cottrell. 
Do. 
Kling-Weidlein. 
Do. 
Do. 
Do. 
Cottrell. 
Bag filter. 
Khng-Weidlein. 
Cottrell. 
Do. 
Tennessee Coal, Iron & Railroad Co., Birmingham, Ala I Kling-Weidlein. 
Owing to the low potash content of the materials used in some 
plants, it will no doubt be found that the dust from these plants, if 
collected, will be too low grade to be used as a source of potash, 
unless it is found to contain other products of value which will con- 
tribute to the cost of concentrating potash. It is also certain that 
the cost of installation excludes the possibility of recovery at most 
small furnaces. The situation with respect to plants operating on 
manganiferous, manganese, southern, or Marquette and Menominee 
ores should be entirely different. Owing to the relatively high potash 
content of these ores, it is possible that the dust from these plants 
will be found to be richer than the richest cement dust. 
It has been shown that the amount of potash volatilized in cement 
kilns may be considerably increased by such chemical means as the 
addition of ordinary salt to the raw mix or to the coal used for fuel. 
Similar results have been obtained in experiments at blast furnaces 
in the British Isles, in which it was found that the addition of salt 
to the charge doubles or even quadruples the quantity of potash 
in the gas. 7 
It may finally be emphasized that if dry systems eventually find 
general use for purifying blast furnace gases the collected dust, 
although possibly not extensively used as a source of potash under 
normal conditions may nevertheless serve as an important potential 
source of potash which would be immediately available in case of 
future emergency. 
SUMMARY. 
The weighted average of the potash in the ores, coke, and lime- 
stone used in the blast-furnace industry amounts to approximately 
0.2 per cent for each material, which is less than one-third as great 
as that found for the raw mix used in the cement industry. In the 
case of the ores, the potash ranges from 0.04 per cent for Mesaba 
ores to over 2 per cent for certain foreign ores. As the consumption 
of high-potash ores is relatively small as compared with low-potash 
ores, the weighted average of the potash in the ores consumed is less 
than the mean average found for different ore samples. The total 
potash in the ore, coke, and limestone used in blast furnaces amounts, 
respectively, to 7.3, 4.1, and 1.7 pounds per ton of pig iron, or to a 
'Chance, Kenneth M. The Prospects of Founding a Potash Industry in this Country. J. Soc. Chem. 
Ind. y. 37, p. 222-230 T. 1918. 
