Improvements in the Manufacture of Mineral or Slag Wool.
Year: 1893

page_text: Date of Application, 25th May, 1893
Complete Specification Left, 1st June, 1893-Accepted, 1st July, 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by HENRY JOHN WHITE, of 69, Jefferson Buildings,
Court Square, Brooklyn, New York, U.S.A., Engineer.]
Improvements in the Manufacture of Mineral or Slag Wool.
I, THOMAS ERNEST HALFORD, of 33 Priory Road, Bedford Park, in the
County of Middlesex, Engineer, do hereby declare the nature of this invention to
be as follows:-
My invention relates to certain improvements in the manufacture of mineral or
slag wool and has for its object the elimination of the sulphuretted hydrogen which
is very deleterious at all times more especially when the wool is to be used in the
arts, the smell also of the said gas is most unpleasant.
My process also renders the mineral wool free from these fumes of sulphuretted
hydrogen when used in connection with steam or heated gases containing more or
less moisture or for insulating purposes in a humid atmosphere.
Now according to this invention I place a suitable quantity of blast furnace slag
in a reverberatory or other suitable furnace and heat the same till the material
fuses or liquifies.
When the mass is fused I add thereto a mixture of alumina (Al,O,) and black
oxide of manganese (MnO,) which combines with the sulphuretted hydrogen to form
sulphides of aluminium and manganese.
The resulting compound is heated for about thirty minutes and then treated in
the usual way by a jet of steam or air to form mineral wool.
Instead of using blast furnace slag, I may use a mixture of silica (flint or quartz)
chalk (or limestone) and felspar, the felspar being used to render the mass when
fused more fluid.
The ingredients are heated to fusion in a suitable furnace and when fused I add
thereto alumina and manganese as hereinbefore mentioned and treat the resulting
compound as hereinbefore described.
Dated this 05th day of Nov 1802
THOS. E. HALFORD.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Mineral or Slag Wool.
I THOMAS ERNEST HALFORD, of 33 Priory Road, Bedford Park, in the
County of Middlesex, Engineer, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
My invention relates to certain improvements in the manufacture of mineral or
slag wool and has for its object the elimination of the sulphuretted hydrogen which
is very deleterious at all times more especially when the wool is to be used in the
arts, the smell also of the said gas is most unpleasant.
My process also renders the mineral wool free from these fumes of sulphuretted
hydrogen when used in connection with steam or heated gases containing more or
less moisture or for insulating purposes in a humid atmosphere.
Now according to this invention I place a suitable quantity of blast furnace slag
in a reverberatory or other suitable furnace and heat the same till the material
fuses or liquifies.

page_text: oxide of manganese (MnU₂) in about the following proportions,
Alumina
Manganese
-
-
10 per cent.
-
12 to 15 per cent.
} by weight,
which combines with the sulphuretted hydrogen to form sulphides of aluminium and
manganese.
The resulting compound is heated for about thirty minutes and then treated in
the usual way by a jet of steam or air to form mineral wool.
Instead of using blast furnace slag, I may use a mixture of silica (flint or quartz)
chalk (or limestone) and felspar in about the following proportions
Silica
-
Limestone or chalk
Felspar
-
-
-
3 parts
2 parts
5 parts
by weight,
the felspar being used to render the mass when fused more fluid.
The ingredients are heated to fusion in a suitable furnace and when fused I add
thereto alumina and manganese in about the hereinbefore mentioned proportions
and treat the resulting compound as hereinbefore described.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is.
1st. In the manufacture of mineral wool from blast furnace slag the use of
alumina and black oxide of manganese substantially as and in about the proportions
described.
2nd. The manufacture of mineral wool by fusing together in a suitable furnace a
mixture of felspar, silica, and limestone or chalk adding thereto when fused alumina
and black oxide of manganese substantially in the proportions and as hereinbefore
described, and subsequently treating the resulting compound with a jet of air or
steam as described.
Da
T
1000
T. E. HALFORD.