ANALYSIS OF IRON ORES, &C. ^K 



brouglit together and hardened by tl)e heat, it had lost the 

 capacity of being soluble. 



The solution was void of colour; and oxalate of ammo- Lime. 

 nia threw down from it a gram|lous precipitate, which when 

 washed and dried weighed 2 decig. [3 gvs.], and was true 

 oxftlate of lime. 



The liquor from whicli the oxalate of lime had been pre- Phosphoiic 

 cipitated, as has just been mentioned, being evaporated to ^^^ ' 

 dryness, and the residuum calcined, yielded an acid, which 

 had all the properties of the phosphoric. 



The first liquor, to which the limewater had been added Chrome. 

 to precipitate the phosphoric acid, was mixed with nitrate 

 of mercury recently prepai-ed ; when a brown yellow preci- 

 pitate was formed, which assumed a green tinge by drying 

 in the air. The precipitate fused with borax gave it a very 

 fine green colour, which proved it to be a chromate of mer- 

 cury with excess of oxide. 



Thus the presence both of chrome ai\d phosphoric acid All these must 

 in the scoriae from the refining furnace is demonstrated, jiaveexistel 

 These matters, as well as those that will be mentioned be- aud iu the ore. 

 low, existed in the pig iron, and previously in the ore, for 

 nothing was added during the processes of v/orking them, 

 from which these could have been produced. 



After the chrome, phosphoric acid, manganese, and a Muriatic acid 



portion of the silex and alumine, had been separated, ^^''^^"'zeci br 

 ,. .. -Tin tneterruginuus 



Mr. Vauquelin dissolved m muriatic acid the ferruginous part. 



part, which had then a yellowish I'ed colour. He observed, 



that, notwithstanding the alkali had taken from it a great 



deal of oxide of manganese, a perceptible portion of oxi- 



genized muriatic acid was produced, as the dissolution went 



on. 



A white powder remained at the bottom of the liquor, Silex. 

 which when washed and dried weighed 88 cent. [13'6 gr,], or 

 about a fifth of the weight of the scoriae. During the evapo- 

 ration of the liquor, which was carried to dryness, a portion 

 of the f;ame substance was precipitated, which was freed by 

 means of muriatic acid from a little iron, that fell down with 

 it. This coiitained some traces of chrome, for it communi- 

 cated to borax a plain green colour. It was silex. 



JM- Vauquelin prgcipi^atgd the jr<?n frgui its solution by Lime- 

 15 2 ammonia. 



