Mr. Drown on the Products of the Soda Manufacture. 279 



able alkali, that is, alkali combined with carbonic acid and water, and 

 yielded on analysis, — 



Analysis of Ash 

 from Germany, 

 I. II. by Unger. 



Carbonate of soda, 71614 70461 62-13 



Hydrate of soda, 11-231 13132 17*20 



Sulphate of soda, 10*202 9*149 8*66 



Chloride of sodium, 3*051 4*279 3-41 



Sulphite of soda, 1*117 1*136 0*35 



Aluminate of soda, 0*923 0-734 1*11 



Silicate of soda, 1*042 0*986 2*56 



Sand, 0*316 0*464 0*62 



Water, — — 3*96 



99*496 100-341 100*00 



The next stage of the process which comes under our consideration 



is,- 



IV. The Carbonate of Soda process. 



The carbonate of soda balls are lixiviated with water in the same 

 way as in the manufacture of soda ash. The liquor from the settler 

 is pumped up into a pan, where it is evaporated till it becomes nearly 

 dry. It is then taken out of the pan in colanders, thrown up in a heap, 

 and allowed to drain. The sulphuret of sodium and caustic soda soon 

 deliquesce and drain out from the salt. 



This salt, after drying at 212°, gave, when analysed, — 



i. n. 



Carbonate of soda, 79641 80*918 



Hydrate of soda, 2*712 3-924 



Sulphate of soda, 8*641 7*431 



Sulphite of soda, 1*238 1*110 



Sulphuret of sodium, trace 0*230 



Hyposulphite of soda, trace trace 



Chloride of sodium, 4-128 3*142 



Aluminate of soda, 1*176 1014 



Silicate of soda, 1*234 1-317 



Insoluble matter, 0*972 0*768 



99*742 99*854 



This salt is then introduced into a reverberatory furnace and carbonated. 

 The last traces of sulphur are thus oxydized, and almost the whole of the 

 hydrate is converted into carbonate. 



Tins salt yielded, on analysis, — 



