Heated in air it yields a mixture of ferric oxide and chloride, and in steam magnetic oxide, hydrochloric acid, and hydrogen.
The alumina may be separated from the ferric oxide by potash-lye.
The liquors are previously mixed with a little milk of lime, which frees them from ferric oxide, alumina, and silica.
Ferrous oxide is obtained when ferric oxide is reduced in hydrogen at 300 as a black pyrophoric powder.
The iron found is calculated to ferric oxide by dividing by .7.
The yellowish-green product consists essentially of neutral chromate of calcium, mixed with ferric oxide.
It is chiefly used as a test for ferric oxide, for which purpose it is preferable to all other substances.
On wool and silk Prussian blue is very fast to light, but alkalis turn it brown (ferric oxide).
Iron, in the state of ferric oxide is of less importance, but pyrites and all ferrous compounds are particularly objectionable.
Thus iron protoxide is now generally known as ferrous oxide, and iron peroxide as ferric oxide.
|ferric oxide |
A reddish-brown to silver or black compound which occurs naturally as the mineral hematite and as rust. It is often used as a pigment and a metal polish. Chemical formula: Fe2O3.