34 Mr. J. Brown on the Products of the Soda Manufacture. 



Carbonate of soda 

 Hydrate of soda . . 

 Sulphate of soda . . 

 Sulphite of soda . . 

 Sulphuret of sodium 

 Hyposulphite of soda 

 Chloride of sodium . 

 Aluminate of soda . 

 Silicate of soda . . 

 Insoluble matter . . 



99-742 



99-854 



This salt is then introduced into a reverberatory furnace and 

 carbonated. The last traces of sulphur are thus oxidized, 

 and almost the whole of the hydrate is converted into carbo- 

 nate. 



This salt yielded on analysis, — 



Carbonate of soda 

 Hydrate of soda . 

 Sulphate of soda . 

 Sulphite of soda . 

 Chloride of sodium 

 Aluminate of soda 

 Silicate of soda 

 Insoluble matter . 



I. 



84-002 

 1-060 

 8-560 

 trace 

 3-222 

 1-013 

 0-984 

 0-716 



99-557 



II. 



83-761 

 0-734 

 9-495 

 0-386 

 3-287 

 0-620 

 0-780 

 0-846 



99-909 



A finer kind of soda-ash is frequently made from this salt by 

 dissolving it in water, evaporating to dryness, and carbonating. 

 It contains very little caustic soda, and should average about 

 50 per cent, of alkali. 



It yielded on analysis, — 



Carbonate of soda 

 Hydrate of soda . 

 Sulphate of soda . 

 Sulphite of soda . 

 Chloride of sodium 

 Aluminate of soda 

 Silicate of soda 

 Insoluble matter . 



99-350 99-437 



It is from this salt that the crystallized carbonate of soda is 



