The alumina may be separated from the ferric oxide by potash-lye.
If present, ferric ferrocyanide, a blue precipitate, will be formed.
From a mixture of muriate of iron (ferric chloride) and spirit of tar.
The liquors are previously mixed with a little milk of lime, which frees them from ferric oxide, alumina, and silica.
It has a bitter taste and acid reaction; its aqueous solution is unaffected by the ferric salts and tincture of galls.
The liquid is next pumped into the settlers, in which it deposits its ferric and aluminic oxides and sulphate of lime.
Ferric chloride can form no less than four stable hydrates, viz.
It represents, in other words, the lowering of the fusion point of ice by addition of ferric chloride.
Fig. 121 shows us, also, what are the conditions under which the reduction of ferric to ferrous oxide by carbon can occur.
The pressure, therefore, remains constant until all the ferric oxide has disappeared.