18 BULLETIN 572, U. S. DEPARTMENT OF AGRICULTURE. 
TasLe V.—Comparison of the amounts of potash and soda lost in cement manufacture. 
Loss 
Raw mix. | Cement. pete Ra- | barrel of eras 
* | Hoof) cement. | pot- 
Company. Plant. psi __lash te 
mi soda 
Pot- Pot- Pot- age | Pot- in flue 
ash. | Soda. ash, | 5°48-| 5.p,. | Seda.|losses. ash, | Soda. dast. 
Deh e att we, ct. Fé. | Potts) Pct.| Ebs. | Lbs. 
_— Portland Cement | Martin’s Creek | 0.92 | 0.48 | 0.77 | 0.50 | 49.1 | 36.7 1.34} 2.82] 1.10] 2.56: 
Grmachtild ottiand 66-1!) 77| .39| .63] .48 25.8/ 1.96 | 2.46] .63| 3.90: 
ment Co. wn 
Cowell Portland Ce |........5..22.-- 59) .43 | .55 | .49 28.8 | 1.45; 1.50| .75.| 2.00 
ment Co. | 
Edison Portland Ce-|...............- 69] .59| .70] .49| 39.8] 50.7! .78/1.7%6! rok] 92 
ment Co. | | 
on Portland Cement | Egypt........ <4 4. .02| 2.004 Jot | Of.5 | 34.9 1 1-56 1 2-607 Bled te oe 
Iola “Portland Cement |................ 58} .54] .60] .61 | 39.2| 33.6 | 1.17] 1.47 | 1.17 | 1.26 
Oo. 
Knickerbocker Portland)......-.......... 81} .50) .78] .59 | 38.3 | 24.4] 1.57] 1.84} .72] 2.56 
Cement Co. 
pce PorulantdGe- sf 1.01 .o3 88 55 | 45.7 | 25.4 | 1.29 | 2.82] 1.14 | 2.47 
mer 
— (Portland Ce- | Fogelsville....| .71 45 47 38 | 58.6 | 47.2 | 1.24 | 2.53 | 1.29) 1.96 
ment Co 
gD th ee A fe Mitchell......: 7 61 ef 7 |} 43.8) 27.2 | 1.61 | 2.91} £6! | 2.09 
DDO toe a ie, ges Ormred .-5- 2 634. 6394 88. 52 | 62.2 | 16.4 | 3.80 | 2.37} .39) 6.07 
Bu) Pere, SE an Oa ete Mason City....| 1.00} .50] .63 61 | 61.5 | 25.5 | 2.41 | 3.82} .79 4.84 
Mamet Portland. Ce-4) 27 sefSees oe -70} .58| .63 66 | 44.4 | 29.7] 1.49 | 1.91 | 1.06) 1.80 
ment Co. 
Nazareth Cement Co.-.}.......:........ -84! .61| .64! .60 39.7 | 1.34 | 2.78 | 1.50:| 1.85 
Northwestern States |......22..02.2.. 1.08| .43| .99| .44 31 3 | 38.3 | 1.09 | 2.72] 1.04 2.62 
Portland Cement Co. | 
ae Portland Cement}................ | oo | LOU 98 | 35.0 | 10.3 | 3.40 | 1.03 | .438 | 2.46 
O. 
ieee Cement Gor | 22 -S22-- 0 - = 94] .70| .24 65 | 84.9 | 45.2 | 1.88 | 5.14 2.04 | 2.52 
oO 
ig Portland Cement |...............- | 90 37 81 45 | 43.9 | 24.2 | 1.81 | 2.41 .55 | 4.38 
Vulcanite Portland Ce- |................ -08 | .36 58 41 | 40.6 | 32.4 | 1.25 1.51 | 75 | 2.06 
ment Co. | i 
Whitehall Portland Ce- |...............- 77 58 | .58 66 | 50.6 | 25.4 | 1.99 | 2.26 85; 2.66: 
ment Co. 
! i 
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,’ wherein flat 
1 Schmidt, W. A., loc. cit.; U.S. Patent No. 1,200, 887, 
