A Process for the Production of Cement from Furnace Slag.
Year: 1894

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Date of Application, 31st May, 1894
Complete Specification Left. 1st Feb., 1895-Accepted, 23rd Mar., 1895
PROVISIONAL SPECIFICATION.
A Process for the Production of Cement from Furnace Slag.
We JEAN PIERRE BRASSEUR and NICOLAS LAMBERT, both of the Cement
Works, Luxembourg, do hereby declare the nature of this invention to be as
follows:-
In the processes hitherto used for the production of cement from furnace slag the
granulated and reduced slag has been dried in ovens and mixed with slaked lime.
For this purpose special apparatus or ovens were necessary to effect the drying thus
making expenses and difficulty in putting such manufacture into operation.
The object of the present invention is to remove these difficulties and facilitate
and cheapen the manufacture of cement from furnace slag besides improving its
quality, which objects are attained by putting the slag whilst still damp with burnt
lime in such manner that the moisture of the slag is taken up by the lime in slaking
and an entirely dry product results without having special drying apparatus.
This process, for the purpose intended, can be carried out in the following
manner.
The furnace slag flows directly from the furnace into a water container and
is transposed into horny masses which are made into heaps in the open. Here,
assisted by the action of the air it is further reduced and loses the superabundant
water. This slag whilst still moist is then mixed with burnt lime which has been.
ground and the mixture is made into heaps.
The lime takes up the moisture contained in the slag, is slaked and crumbles up.
An entirely dry mixture is thus produced which either at once or after previously
roasting is reduced to cement fit for use in a mill.
This process besides having the above mentioned advantage of being simple and
cheap to carry out, and the manufacture being easily introduced, has the further one
that the product, in consequence of the action of the unslaked lime, is of
extraordinary good quality and is specially suitable for works in sea water;
furthermore it is considerably cheaper in its manufacture.
Dated this 30th day of May 1894.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
We JEAN PIERRE BRASSEUR and NICOLAS LAMBERT, both of the Cement
Works, Luxembourg, 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 :—
In the processes hitherto used for the production of cement from furnace slag the
granulated and reduced slag has been dried in ovens and mixed with slaked lime.
For this purpose special apparatus or ovens were necessary to effect the drying,
thus making expenses and difficulty in putting such manufacture into operation.
Pric

page_text: The object of the present invention is to remove these difficulties and facilitate
and cheapen the manufacture of cement from furnace slag besides improving its
quality, which objects are attained by putting the slag, whilst still damp, with
burnt lime in such manner that the moisture of the slag is taken up by the lime in
slaking and an entirely dry product results without having special drying
apparatus.
This process for the purpose intended can be carried out in the following
manner.
The furnace slag flows directly from the furnace into a water container and is
transposed into horny masses which are made into heaps in the open. Here
assisted by the action of the air it is further reduced and loses the superabundant
water. This slag, whilst still moist, is then mixed with burnt lime which has been
ground in the proportion, approximately, of 75 per cent. of slag to 25 per cent. of
burnt lime, and the mixture is made into heaps.
The lime takes up the moisture contained in the slag, is slaked, and crumbles up.
An entirely dry mixture is thus produced which either at once or after previously
roasting is reduced to cement fit for use in a mill.
This process, besides having the above mentioned advantage of being simple and
cheap to carry out, and the manufacture being easily introduced, has the further
one that the product in consequence of the action of the unslaked lime is of
extraordinary good quality and is specially suitable for works in sea water;
furthermore it is considerably cheaper in its manufacture.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :
A process for the production of cement from furnace slag in which wet granulated
furnace slag mixed with unslaked lime, the slaking of which is effected by means
of the moisture in the furnace slag, substantially as described.
Dated this 31st day of January 1895.
WHEATLEY & MACKENZIE,
40, Chaucery Lane, London, W.C., Agents.