MANUFACTURE OF SOLUBLE PHOSPHATES. 83 



T\BLE XLL— AMOUNT AND STRENGTH OF ACID REQUIRED TO 

 DISSOLVE VARIOUS PHOSPHATES.^ 



Ca3P208 



Per cent. 



Bone ash . 

 Maiden guano . 

 Aruba phosphate 

 Curasao phosphate 

 Podolia coprolites 

 Carolina phosphate 

 Canadian phosphate 

 Somme phosphate 

 Liege phosphate 

 Ciply phosphate 



Florida phosphate 

 Pebble phosphate 

 Peace River phosphate 

 Tennessee phosphate 



Algerian phosphate 



Gafsa phosphate 

 Clipperton guano 

 Peruvian guano . 

 Precipitated phosphate 

 Steamed bone dust 

 Degelatinized bone dust 



82-1 

 72-4 

 78-6 

 88-0 

 74-7 

 56-0 

 76-8 

 67-0 

 55 -5 

 40-7 

 48-2 

 53-8 

 57-4 

 78-0 

 .68-0 

 61-7 

 80-5 

 69-9 

 58-2 

 65-0 

 59-6 

 78-7 

 26-2 

 32-0 

 22-0 

 31-0 



Oxide of 

 Iron and 

 Alumina. 

 Per cent. 



Carbon- 

 ate of 

 Lime. 



Per cent. 



100 lb. of 

 Phos- 

 phate re- 

 quire lb. 

 of Acid. 



Degree 

 Baume.2 



0-3 

 0-3 



3-8 



0- 

 5- 

 2- 

 3 

 3 

 3 

 2 

 1 

 1 



0-8 

 2-0 

 1-8 

 2-9 

 3-4 

 2-3 

 0-5 

 0-6 

 1-7 

 0-1 

 0-5 



0-4 



4-4 

 12-5 

 4-2 

 7-0 

 4-7 

 12-0 

 6-6 

 10-2 

 16-8 

 41-8 

 35-6 

 34-2 

 29-1 

 4-4 

 6-3 

 8-4 

 5-2 

 6-0 

 20-8 

 16-0 

 9-7 

 6-7 

 1-8 



5-2 



95 

 82 

 100 

 105 

 120 

 100 

 110 

 105 

 105 

 131 

 125 

 130 

 125 

 110 

 100 

 95 

 110 

 105 

 110 

 100 

 100 

 100 

 25 

 55 

 70 

 74 



52 



60 



52-5 



50 



50 



50 



55 



51 



50 



49 



49 



49 



49 



50 



50 



50 



50 



50 



50 



52 



50 



52 



60 



60 



50 



55 



1 Such a table is of course very valuable, but it is better to calculate all 

 acid to B.O.V. whatever be the strength used. That keeps the acid account 

 correct. At stocktaking the manufacture then shows a gain in weight, but that 

 is all to the good, a sort of manufacturer's own private bonus. But if the 

 different strengths of acid used be all entered at the actual weight taken then 

 there can be no chemical control of the amount of acid used; nor if the 

 manure manufacturer makes his own acid of the amount of acid he has made. 

 The general rule is to take the stock of acid in hand, calculate it to B.O.V. , 

 add to it the amount used in mixing, and take that as the amount of acid made 

 in the season, which, checked against the pyrites burnt, say Rio Tinto, should 

 give a yield of 30 cwt. B.O.V. per ton of pyrites burnt.— Te. 



2 (1) 49° B = D = 1-515 = 103 Tw. (2) 50° B = D =1-530 - 106 Tw. (3) 51= 

 B = D L 1-546 = 109-2° Tw. (4) 52° B - D = 1-563 = 112-6 Tw. (f) -52-0° B 

 = D = 1-572 = 114-4° Tw. (6) 55° B = D = 1-615 = 123° Tw. (7) 60° B = D 

 = 1-710 = 142° Tw. (8) Acid in Great Britain is generally used as near D - 

 1-60= 120° Tw. as practicable. B.O.V. is acid of D = 1-700 or 140 Tw.— Ik. 



