Improvements in and relating to the Calcining of Carbonates for Cements and other purposes.
Year: 1890

page_text: Date of Application, 5th July, 1890
Complete Specification Left, 4th Apr., 1891-Accepted, 20th Junė, 1891
PROVISIONAL SPECIFICATION.
Improvements in and relating to the Calcining of Carbonates for
Cements and other purposes.
I; WILLIAM DARLING, of Springhead, Shotts, Lanarkshire Mining Contractor,
do hereby declare the nature of my invention to be as follows:-
This invention has reference to and comprises a new or improved process of
calcining carbonates, and making same applicable for cements, manures or other
purposes, and which will utilize the heat and material of a waste product not hitherto
utilized for this purpose.
The improvements consist in taking hot or molten slag from cast-iron
blast, steel or other furnaces or cupolas, in open or close box bogies or carriages or
vessels to chambers or pits away from the furnaces and in utilizing the heat of
same for the calcining of carbonates in close crucibles, retorts, or other refractory
vessels immersed in the molten slag in said vessels or pits, or the carbonates may
be mixed with and calcined directly in and by the molten slag in open or close vessels.
This is effected under one arrangement by running the hot molten slag from the
furnaces into a bogie or vessel having a close crucible or retort mounted or placed
within it, in which is placed broken up limestone, cementstone, or other carbonate.
The molten slag will surround the lower part and sides of the close crucible or
retort and heat the limestone until calcined and the calcined compound in the
crucible, and the molten slag in the separate vessel can be removed and replaced
with fresh charges from time to time. The quick lime or calcined product removed
from the crucible can be used to mix with other materials to form limes and
cements, or be used for other purposes. Broken up limestone, cementstone, or
other carbonate can also be added to and mixed with the molten slag in an open or
close vessel and get calcined in proportions to form a compound very suitable as a
cement, mortar, or concrete, and be also applicable as a manure.
In this way to
form a cement the proportion of limestone or cementstone to the molten slag would
be about from 30 to 60 per centum according to the carbonaceous quality of the
mineral used, and the composition of the slag; and to form a manure the propor-
tion of limestone would vary from 10 to 30 per centum according to the quality of
the mineral used and the composition of the slag. This calcining of the carbonate
in admixture with the molten slag makes the compound more friable and easily
crushed or ground into a powdered material ready for making up into cements or
mortars and manures, and other materials might be incorporated to strengthen or
make this mixture more suitable for the said different purposes. The molten slag
might be conveniently conveyed in portable carriages, bogies, or ladles to be treated
as described some distance away from the furnaces in said vessels, or in special
chambers, pits or otherwise.
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1 1
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COMPLETE SPECIFICATION.
Improvements in and relating to the Caloining of Carbonates for
Cements and other purposes.
I, WILLIAM DARLING, of Springhead, Shotts, Lanarkshire, Mining Contractor,
do hereby declare the nature of my invention, and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement in writing, that is to say :-
This invention has reference to and comprises a new or improved process of
Die A

page_text: calcining carbonates, and making same applicable for cements, manures or other
purposes, and which will utilize the heat and material of a waste product not
hitherto utilized for this purpose.
The improvements consist in taking hot or molten slag from cast-iron blast, steel
or other furnaces or cupolas, in open or close box bogies or carriages or vessels to
chambers or pits away from the furnaces and in utilizing the heat of same for the
calcining of carbonates in close crucibles, retorts, or other refractory vessels
immersed in the molten slag in said vessels or pits, or the carbonates may be mixed
with and calcined directly in and by the molten slag in open or close vessels.
In carrying my invention into practice this is effected under one arrangement by
running the hot molten slag from the furnaces into a bogie or vessel having a close
crucible or retort mounted or placed within it, in which is placed broken up lime-
stone, cementstone, or other carbonate. The molten slag will surround the lower
part and sides of the close crucible or retort and heat the limestone until calcined
and the calcined compound in the crucible, and the molten slag in the separate
vessel can be removed and replaced with fresh charges from time to time. The
quicklime or calcined product removed from the crucible can be used to mix with
other materials to form limes and cements, or be used for other purposes. Broken
up limestone, cementstone or other carbonate can also be added to and mixed with
the molten slag in an open or close vessel and get calcined in proportions to form a
compound very suitable as a cement, mortar, or concrete, and be also applicable as
a manure. In this way to form a cement the proportion of limestone or cementstone
to the molten slag would be about from 30 to 60 per centum according to the
carbonaceous quality of the mineral used, and the composition of the slag; and to
form a manure the proportion of limestone would vary from 10 to 30
according to the quality of the mineral used and the composition of the slag. This
calcining of the carbonate in admixture with the molten slag makes the compound
more friable and easily crushed or ground into a powdered material ready for
making up into cements or mortars and manures, and other materials might be
incorporated to strengthen or make this mixture more suitable for the said different
purposes. The molten slag might be conveniently conveyed in portable carriages,
bogies, or ladles to be treated as described some distance away from the furnaces in
said vessels, or in special chambers, pits, or otherwise.
per
centum
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 :-
First. The herein described process of calcining limestone, cementstone, or other
carbonates and making same applicable for cements and other purposes, consisting
in taking hot or molten slag from blast or other furnaces or cupolas, and conveying
same to vessels, chambers, or pits, and utilizing the heat for the calcining of
carbonates in separate close crucibles, retorts, or vessels, substantially as set forth.
Second. The herein described process of calcining limestone, cementstone or
other carbonates and making same applicable for cements and other purposes,
consisting in taking hot or molten slag from blast or other furnaces or cupolas, and
conveying same to open or close vessels and mixing it with carbonates to directly
calcine these, substantially as set forth.
Dated the 3rd April 1891
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.