Mr. Brown on the Produ<t> <,f t/„- Soda Manufacture. y/.i 



Sulphur, 

 Soda Bull. BaOS0 3 BaOS0 3 p.c. c.p. 



By ist (19-34 gave, 1790 92*554 — 1-872 = 90-682 12-507 



Method, J1953 _ 1820 93*189 — 1-872 = 91-317 12-595 



By 2d (28-90 — 27 00 93-425 — 1-872 = 91-553 12627 



Method 120-eO — 27^0 91-891 — 1-872 = 90019 12-416 



Average 12*536 



6. Magnesia. 



This was precipitated by ammonia and phosphate of soda : — 

 Ball Soda. 2 MgOP0 5 MgO p.c. 



100 gave, 0980 0-350 



7. Silica and sand. 



The soda ball was dissolved in muriatic acid, and the solution evapo- 

 rated to dryness. The residue was then digested with strong muriatic 

 acid, and the insoluble matter separated by filtration : — 



Ball Soda. Silica and Sand. Silica and Sand, p.c. 



56-00 gave, 430 7'679 



The silica was separated from the sand by strong caustic potash : — 



Ball Soda. Sand. Sand, p.c. Silica, p.c. 



5600 gave, 2-40 4*285 3*394 



8. Iron and alumina. 



A portion of the soda ball was dissolved in muriatic acid, and after 

 separating the insoluble matter, the iron and alumina were precipitated 

 by caustic ammonia : — 



Ball Soda. A10<fcFe 2 3 A10&Fe 2 3 p.c. 



61*20 gave, 3*45 5637 



19-53 — 1*15 5888 



2910 — 145 4982 



Average, 5*502 



The peroxide of iron was separated from the alumina by caustic 

 potash : — 



Ball Soda. Fe 2 3 Fe a 3 p.c. Fe p.c. AlO p.c. 



61*20 gave, 294 4*804 3*363 0833 



29*10 — 1*20 4*123 2886 0-859 



Average, 3-129 0-846 



9. Lime. 



From the solution filtered from the alumina and iron, the lime was 

 precipitated by oxalate of ammonia : — 



Ball Soda. I CO a CftO CaO p.c. 



61*20 gave, 3300 18*480 30194 



29*10 — 15*50 8*680 29-828 



21*80 — 1205 6*748 30-954 



Average, 30-325 



