260 SUPERPHOSPHATE OF LIME. 



Boiled or steam- 

 ed bones, 100 lbs. require 70.22 lbs. of oil of vitriol. 



Sugar house refuse or bone black varies much in its com- 

 position, containing from 65 to 75 per cent, of phosphate, 

 and from 10 to 12 per cent, of carbonate of lime ; its com- 

 position should be always ascertained before conversion into 

 superphosphate of lime. 



As a general rule, bone black will require about the same 

 weight of oil of vitriol as boiled bones. 



306. If it is intended to convert bone ash into superphos- 

 phate, 100 lbs., as has been shown (305), require 87| lbs. of 

 oil of vitriol for all purposes. The product when dried in 

 warm air, so as to crumble easily with slight crushing into 

 a coarse powder, will weigh about 183 pounds, constituted 

 as follows : 



183.22 



100 lbs. of this crude mass, commercially termed super- 

 phosphate, are composed as follows ; 



Superphosphate of lime of which are solu- 



(double), . . 26.04 ble in water, 26 04 lbs. 



Sulphate of lime, . 65.53 



" magnesia,. 1.38 . . , . 1.38 " 



" soda, . 2.69 .... 2.69 " 



