18 BULLETIN 572, U. S. DEPARTMENT OF AGRICULTURE. 



Table V. — Comparison of the amounts of potash and soda lost in cement manufacture. 



Company. 



Plant. 



Raw 



mix. 



Cement. 



Loss from 

 kilns. 



Ra- 

 tio of 

 per- 

 cent- 

 age 

 losses. 



Loss per 

 barrel of 

 cement. 



Ra- 

 tio of 

 pol- 





Pot- 

 ash. 



Soda. 



Pot- 

 ash. 



Soda. 



Pot- 

 ash. 



Soda. 



Pot- 

 ash. 



Soda. 



soda 

 in flue 

 dust. 



Alpha Portland Cement 



v 0. 



Clinchfield Portland Ce- 



Martin's Creek 



P. ct. 

 0.92 



.77 



.59 



.69 



.77 



.58 



.81 



1.01 



.71 



.79 



.63 



1.00 



.70 



.84 

 1.08 



.50 



.94 



.90 



.58 



.77 



P. ct. 



0.4S 



.39 

 .43 

 .59 

 .52 



.54 



.50 



.53 



.45 



.61 

 .39 

 .50 



.58 



.61 

 .43 



.71 



.70 

 .37 

 .36 

 .58 



P. ct. 



0.77 



.63 



. 55 



.70 



.59 



.60 



.78 



.88 



.47 



.71 

 .38 

 .63 

 .63 



.64 

 .99 



.50 



.24 



.SI 



. .'58 



.58 



P. ct. 

 0.50 



.48 



.49 



.49 



. 57 



.61 



- .59 



.55 



.38 



.71 

 .52 

 .61 

 .66 



.60 

 .44 



.98 



.65 



.45 



.41 



.66 



P. ct. 

 49.1 



50.6 



41.7 



39.8 



54.5 



39.2 



38. 3 



45.7 



58.6 



43.8 

 62.2 

 61.5 



44.4 



53.3 

 41.9 



35.0 



84.9 

 43.9 

 40.6 

 50.6 



P. ct. 



36.7 



25.8 



28.8 



50.7 



34.9 



33.6 



24.4 



35.4 



47.2 



27.2 

 16.4 

 25.5 

 29.7 



39.7 

 38.3 



10.3 



45.2 



24.2 



32.4 



25.4 



1.34 



1.96 



1.45 



.78 



1.56 



1.17 



1.57 



1.29 



1.24 



1.61 

 3. 

 2.41 

 1.49 



1.34 



1.09 



3.40 

 1.88 

 1.81 

 1.25 

 1.99 



Lbs. 



2.82 



2.46 



1.50 



1.76 



2.69 



1.47 



1.S4 



2.82 



2.53 



2.11 

 2.37 

 3.82 

 1.91 



2.78 

 2.72 



1.03 



5.14 



2.41 



1.51 



2.20 



Lbs. 



1.10 



.63 

 .75 

 1.91 

 1.16 

 1.17 

 .72 

 1.14 

 1.29 



1.01 

 .39 

 .79 



1.06 



1.50 

 1.04 



.43 



2.04 

 .55 

 .75 

 .85 



2.56 



3 90 



ment Co. 

 Cowell Portland Ce- 





2 00 



ment Co. 

 Edi on Portland Ce- 





92 



ment Co. 

 Giant Fortland Cement 



'.'0. 



Iola Portland Cement 



Egypt 



2.32 

 1.26 



; 0. 



Knickerbocker Portland 





2.56 



Cement Co. 

 Lawrence Portland Ce- 





2.47 



meut Co. 

 Lehigh Portland Ce- 

 ment Co. 

 Do 



Fogelsville 



Mitchell 



Ormrod 



Mason City 



1.96 

 2.09 



Do 



6.07 



Do 



4 84 



Marquette Portland Ce- 



LSQ 



ment Co. 

 Nazareth Cement Co... 





1 85 







2.62 



Portland Cement Co. 

 Pacific Portland Cement 





2 40 



Co. 







of Utah. 

 Texas Portland Cement 





4.38 



Co. 



Vulcanite Portland Ce- 

 ment Co. 



Whitehall Portland Ce- 





2.00 



2. 66 



ment Co. 







Table V shows that for those cases examined the percentage of 

 potash in the raw mix with one exception is in excess of the per- 

 centage of soda. With one -exception, also, the percentages of potash 

 volatilized are considerably in excess of the corresponding values 

 found for soda. It consequently happens that the calculated excess 

 of potash over soda in the dust is in most cases quite marked, the ratio 

 of potash to soda varying in the case of the samples examined from 

 0.92 to 6.07, with an average of 2.66. 



POTASH-PRODUCING PLANTS IN THE UNITED STATES. 



The recovery of the potash which escapes from the stacks of 

 cement kilns was first made at the plant of the Riverside Portland 

 Cement Co., using the Cottrell process of electrical precipitation. 

 The first unit of this installation was completed in 1912, and has 

 been in continuous operation ever since. The following year the 

 installation was enlarged to take care of the gases from 10 kilns, 

 which comprised all the kilns in the plant at that time. This main 

 installation is built on the plate and wire principle, 1 wherein flat 



' Schmidt, W. A., loc. cit.; U. S. Patent No. 1,200,887. 



