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•mod. The formation of these Baits, when mixed together, 

 •i insoluble Boap, which ia technically called rock, 

 and facilil subsequent separation of the solid and liquid 



stituents of the tallow. 



Tanning 

 In tanning lime is used to remove tlic hair from the hides, 

 this being done in what arc known as lime pits. 



Bone-ash 



Tn bone-ash manufacture the lime is employed to precipitate 

 the Bubstances dissolved out of the bones by hydrochloric acid, 



Fertilizer being obtained as a by-product and known as pre- 

 cipitated phosphate of lime. 



Gas manufacture 1 



Tamo is sometimes used in the purification of gas from hydrogen 

 sulfid and carbonic acid gas. It can also be used to remove the 

 disulfid when special methods arc employed. The lime 

 is prepared in the ordinary manner and converted into hydrate 

 Blaking. In order to get the lime in a fit condition for use 

 however, it should be slaked two or three days before its use, for, 

 it' used as soon as formed, it is liable to cake in the purifiers and 

 thus prevent the free passage of the gas through it. Before being 



ced in the purifiers, it. is moistened with water till it attains 

 Buch a consistency that, when pressed together in the hand, it 

 will pack like snow. It is placed in the purifiers in 4 to 6 inch 

 layers. The removal of C(> 2 involves the formation of CaC() 3 , 

 and when H,S is extracted, OaS, ff 8 8 is formed. Both reactions 

 may i:<> on at once, but the lime has stronger affinity for the C() 2 

 than the 11,8. 



manufacture lime may be also used to form ammonia 

 from ammonium chlorid or from ammonium carbonate contained 

 in the gas w;iier from the gas works, the reaction being AmOl 

 •|-r;,(i!l : 2ND • c ; ,n. : vll .<>. 



i Il«-i nbj •'. Gas manufad ure, p. 1 17. 



