4 BULLETIN" 144, U. S. DEPARTMENT OF AGRICULTURE. 



Table I. — Composition of phospha.tic materials used in the manufacture of acid phosphate . 



Phosphatic 

 material. 



Location. 



d 

 2 



a ^ 



hi 



m 



d-A'S 



2SO 



■"0S ■ 



O 



Calcium fluor- 

 ide 

 (CaF 2 .). 



o 



d ~o 

 -P Ho 

 c3'-3 

 o 



o ■ 



■a °: 



co-^Cl, 



2'3 — 

 ■d cs 



SdO 

 .2d c3 



u ftO 



EH 







P.ct. 

 4.06 

 4.14 



1.12 



P.ct. 

 3.01 

 3.60 



2.00 



3.67 

 8.92 

 3.62 



P.ct. 



P.ct. 



P.ct. 

 5.28 

 5.24 



8.00 



4.13 



8.05 



.29 



P.ct. 

 35.38 

 21.68 



31.99 



38.60 

 34.42 

 39.44 



7.57 

 24.36 

 39.70 



35.59 

 29.10 

 27.20 

 34.00 



23. 63 

 32.82 



25 to 28 

 36.39 



30 to 34 



30 to 38 



27 to 32 



32 to 38 



23 to 28 



30 to 35 



27 to 36. 5 



38.73 



P.ct. 

 76.65 











46.50 



bone. 





0.37 



.70 

 1.03 

 1.37 



1.59 

 5.88 

 1.14 



1.39 

 4.07 



2.39 



1.00 



3.10 

 3.04 

 2.62 



73.10 



charcoal. 

 Apatite: 

 High grade 





88.20 



do 



78.65 



Apatite (high 



grade). 

 Bat guano 







86.10 



Porto Rico 



West Indies .... 



8.35 

 .45 

 .40 



16.52 









53.18 



Phospho-guano . . 

 Phosphorite: 

 High grade 









86.66 





.79 

 8.55 

 16.14 

 9.00 



Not det. 

 Not det. 



4 to 12 



4.13 



5 to 10 

 2. 5 to 10 

 2. 5 to 70 



2 to 7. 5 



15 to 40 



2 to 5 



1.8 to 10 



Not det. 





9.17 

 6.95 

 7.07 

 2.30 



10.00 

 12.23 



11 to 25 

 3.63 



2 to 5 



OtolO 



0to2 



77.69 



do 





63.53 



Do 







5.00 



62.15 



Coprolites 



Do 



Cambridge, 



Eng. 

 Suffolk, Eng 





77.70 



9.00 

 5.00 



lto4 

 3.00 



lto4 



3 to 8 



2. 5 to 7 



1.5to3.5 



2.5 to 9.5 



2.5 to 5 



. 07 to 1. 6 



.42 



6.00 

 6.98 



2 to 8 

 4.40 



0to3 



0to5 



0to3 



54.00 



Phosphate nod- 

 ules. 

 Do 







75.00 







57 to 64 



Hard rock phos- 

 phate. 



Land pebble 

 phosphate. 







&3.14 



do 





69 to 78 







69 to 87 



phate. 



Blue rock phos- 

 phate. 



White rock phos- 

 phate. 



Black rock phos- 

 phate. 



Brown rock phos- 

 phate. 



do 



do 





62 to 73 



73 to 87 







53 to 64 











69 to 80 



Utah, Idaho, etc. 





. 8 to 1. 35 

 1.0 



3.8 to 13.6 



4.91 



62 to 83 



phosphate. 

 White phosphate 





84.65 









1 Known to the trade as bone phosphate of lime, t>. p. 1. 



The sulphuric acid used in the manufacture of acid phosphate is 

 the ordinary "chamber acid." It ranges in specific gravity from 

 1.5 to 1.6 at 60° F. and contains from 60 to 70 per cent of sulphuric 

 acid. The fertilizer trade, however, is accustomed to expressing 

 the strength of "chamber acid" in Baume degrees (°B). The 

 manufacturer should have conversion tables at hand showing the 

 specific gravity and percentage of acid corresponding to each degree 

 registered by the Baume hydrometer. Part of such a table approved 

 and adopted by the Manufacturing Chemists Association of the 

 United States is given in Table II. 



