99
SULPHUR.
Sulphur is found in nature in combination with many other
dements, and also uncombined, as native sulphur.
Sulphur may be produced by the decomposition of iron
Pyrites or other sulphur minerals, but at present, practically
the world’s supply is obtained from deposits of native sulphur.
PREPARATION.
The deposits of sulphur contain many impurities from which
the sulphur must be extracted. This is accomplished in several
w ays. The “ore” may be heated to a temperature at which
the sulphur will melt and drain from the gangue, or if a somewhat
a'gher temperature is used the sulphur is volatilized and may be
recovered by condensation. The former method is that usually
ern pl°yed. The sulphur thus prepared is called brimstone,
0r if cast into cylindrical sticks, roll sulphur. When the second
Method is employed the sulphur is obtained in a fine powder,
called flowers of sulphur, or sublimed sulphur.
Another method of extracting the sulphur is to dissolve
. ° ut of the gangue by means of carbon disulphide, from which
1 m ay be recovered by distilling off the solvent.
fn some cases the sulphur is won from deep deposits by
tln g it with high pressure steam and forcing the molten
0 ? p kur to the surface through bore holes. The sulphur thus
fained is said to be almost pure.
USES.
Sulphur is used in Canada principally in the manufacturing
Su lphite pulp from wood. 1
^ ^clphuric acid is made by burning sulphur and converting
sulphur dioxide to sulphur trioxide, which unites with water
0r ming the acid- 2
Sulphur is used to a considerable extent in the manufacture
gOoci Uni,OWder ’ matc h es > pharmaceutical preparations, rubber
tan and lns ulated electric cables, and to a lesser extent in
atlt i n ' ng ’ bleaching of cotton goods, glue making, sugar refining,
bleaching evaporated apples.
1 S’* uS $ S v l;te. page 70.
uses of Pyrite, page 70.
Of