Improvements in Treating Impure Carbonate of Lime Produced in Making Alkali, and in Recovering Sulphur from Alkali Waste, in order to Utilise it for Making Cement and for other Purposes.
Year: 1888

page_text: Date of Application, 29th Sept., 1888
Complete Specification Left, 26th June, 1889-Accepted, 10th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Treating Impure Carbonate of Lime Produced in
Making Alkali, and in Recovering Sulphur from Alkali Waste,
in order to Utilise it for Making Cement and for other Purposes.
I, ROBERT HOWISON STEEDMAN, of Holly Villa, Dalmuir in the County of
Dumbarton, North Britain, Manufacturing Chemist, do hereby declare the nature of
this Invention to be as follows, that is to say :-
My said Invention has for its object, to utilise, for making cement and for other
purposes, impure carbonate of lime obtained in Chance's process for recovering
sulphur from alkali waste, and impure carbonate of lime produced in the causticising
process in the alkali manufacture. The impure carbonate of lime from both sources
is in the condition of a mud, and the impurities it contains consist principally of
small quantities of sulphur compounds which are considered to interfere with the
application of the material for making Portland or other cement or for other
purposes.
In carrying out my Invention I mix together the two kinds of impure carbonate
of lime herein before referred to, and I heat the mixture by means of steam or
otherwise to the boiling temperature. During the boiling operation the mixture is
well agitated by mechanical stirrers, or, as 1 prefer, by injecting air. The sulphur or
sulphur compounds in the mixture are acted on by free lime or alkali which is present
and are converted into soluble sulphides, which are subsequently removed by settling
or washing. The solutions or washings thereby obtained may be used instead of water
in preparing the cream of alkali waste for Chance's sulphur-recovery process, the
sulphur they contained being recovered in that process.
0
The mud from Chance's process may be mixed with milk of lime instead of the mud
from the causticising process; and the mud from the causticising process may be
treated by itself.
The treated material after being washed may be mixed with a proper proportion
of clay for making cement, and the mixture may be passed through a filter press.
The cakes obtained may be dried at once or the material may be moulded into bricks,
and be then dried, and so rendered suitable for calcination and subsequent operations.
Or the treated material may be filtered without admixture with clay, and if required
it may be dried or otherwise rendered suitable for sale or for being used over again
in the alkali causticising process.
When making Portland or similar cement the clay may be mixed with the treated
material in the same vessels in which the preparatory treatment is conducted.
Dated this Twenty-eighth day of September 1888.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Treating Impure Carbonate of Lime Produced in
Making Alkali, and in Recovering Sulphur from Alkali Waste,
in order to Utilise it for Making Cement and for other Purposes.
I, ROBERT HOWISON STEEDMAN, of Holly Villa, Dalmuir, in the County of
Dumbarton, North Britain, Manufacturing Chemist, do hereby declare the nature
Priced 1

page_text: .
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, that is to say :-
My said Invention has for its object to utilise, for making cement and for other
purposes, impure carbonate of lime obtained in Chance's process for recovering
sulphur from alkali waste, and impure carbonate of lime produced in the causticising
process in the alkali manufacture. The impure carbonate of lime from both sources
is in the condition of a mud, and the impurities it contains consist principally of
small quantities of sulphur compounds which are considered to interfere with
the application of the material for making Portland or other cement or for other
purposes.
In carrying out my Invention I mix together the two kinds of impure carbonate
of lime herein before referred to, and I heat the mixture by means of steam or other-
wise to the boiling temperature. During the boiling operation the mixture is well
agitated by mechanical stirrers, or, as I prefer, by injecting air. The sulphur or
sulphur compounds in the mixture are acted on by free lime or alkali which is present,
and are converted into soluble sulphides, which are subsequently removed by settling
or washing. The solutions or washings obtained may be used instead of water in
preparing the cream of alkali waste for Chance's sulphur-recovery process, the
sulphur they contain being recovered in that process.
The mud from Chance's process may be mixed with milk of lime instead of the
mud from the causticising process; and the mud from the causticising process may
be treated by itself. If in a mixture of the two kinds of mud there is not sufficient
free lime or alkali for the sulphur or sulphur compounds present, some milk of lime
may be added to the mixture. When mud from the causticising process is treated by.
itself air must be blown through it during the boiling operation.
The treated material after being washed may be mixed with a proper proportion of
clay for making cement, and the mixture may be passed through a filter press. The.
cakes obtained may be dried at once, or the material may be moulded into bricks, and
be then dried, and so rendered suitable for calcination, and subsequent operations.
Or the treated material may be filtered without previous admixture with clay, and
if required it may be dried or otherwise rendered suitable for sale, or for being used
over again in the alkali manufacture.
When making Portland or similar cement the clay may be mixed with the treated
material in the same vessels in which the preparatory treatment is conducted.
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 I am aware
of the Patent granted to J. S. Rigby 11274 of 1887 and I do not claim the process of
carbonating lime mud as there set forth and claimed but what I claim is :-
1. The treating of impure carbonate of lime or lime residues from the causticising
process of the alkali manufacture and from Chance's process for recovering sulphur
from alkali waste, by mixing heating and agitating the two residues and separating
soluble inatters from the resulting material; substantially as and for the purposes
hereinbefore described.
2. The treating of the lime residue from Chance's process with milk of lime,
heating and agitating the mixture, and separating soluble matter substantially as and
for the purposes hereinbefore described..
3. The using of the washings or solutions obtained in the processes herein before
described in making cream of alkali waste for Chance's process.
4. The treating of the lime residue of the causticising process of the alkali manu-
facture by heating it and blowing air through it substantially as and for the purposes
hereinbefore described.
Dated this Twenty-fifth day of June 1889:
EDMUND HUNT,
Applicant's Agent.

page_text: Date of Application, 29th Sept., 1888
Complete Specification Left, 26th June, 1889-Accepted, 10th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in Treating Impure Carbonate of Lime Produced in'
Making Alkali, and in Recovering Sulphur from Alkali Waste,
in order to Utilise it for Making Cement and for other Purposes.
I, ROBERT HOWISON STEEDMAN, of Holly Villa, Dalmuir, in the County of.
Dumbarton, North Britain, Manufacturing Chemist, do hereby declare the nature of
this Invention to be as follows, that is to say :—
;
My said Invention has for its object, to utilise, for making cement and for other
purposes, impure carbonate of lime obtained in Chance's process for recovering
sulphur from alkali waste, and impure carbonate of lime produced in the causticising
process in the alkali manufacture. The impure carbonate of lime from both sources
is in the condition of a mud, and the impurities it contains consist principally of
small quantities of sulphur compounds which are considered to interfere with the
application of the material for making Portland or other cement or for other
purposes.
In carrying out my Invention I mix together the two kinds of impure carbonate
of lime herein before referred to, and 1 heat the mixture by means of steam or
otherwise to the boiling temperature. During the boiling operation the mixture is
well agitated by mechanical stirrers, or, as I prefer, by injecting air. The sulphur or
sulphur compounds in the mixture are acted on by free lime or alkali which is present
and are converted into soluble sulphides, which are subsequently removed by settling
or washing. The solutions or washings thereby obtained may be used instead of water
in preparing the cream of alkali waste for Chance's sulphur-recovery process, the
sulphur they contained being recovered in that process.
The mud from Chance's process may be mixed with milk of lime instead of the mud
from the causticising process; and the mud from the causticising process may be
treated by itself.
The treated material after being washed may be mixed with a proper proportion
of clay for making cement, and the mixture may be passed through a filter press.
The cakes obtained may be dried at once or the material may be moulded into bricks,
and be then dried, and so rendered suitable for calcination and subsequent operations.
Or the treated material may be filtered without admixture with clay, and if required
it may be dried or otherwise rendered suitable for sale or for being used over again
in the alkali causticising process.
When making Portland or similar cement the clay may be mixed with the treated
material in the same vessels in which the preparatory treatment is conducted.
Dated this Twenty-eighth day of Sentember 1888.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Treating Impure Carbonate of Lime Produced in
Making Alkali, and in Recovering Sulphur from Alkali Waste,
in order to Utilise it for Making Cement and for other Purposes.
I, ROBERT HOWISON STEEDMAN, of Holly Villa, Dalmuir, in the County of
Dumbarton, North Britain, Manufacturing Chemist, 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, that is to say
My said Invention has for its object to utilise, for making cement and for other
purposes, impure carbonate of lime obtained in Chance's process for recovering

page_text: "
sulphur from alkali waste, and impure carbonate of lime produced in the causticising
process in the alkali manufacturo. The impure carbonato of lime from both sources
is in the condition of a mud, and the impurities it contains consist principally of
small quantities of sulphur compounds which are considered to interfere with
the application of the material for making Portland or other cement or for other
purposes.
In carrying out my Invention I mix together the two kinds of impure carbonate
of lime herein before referred to, and I heat the mixture by means of steam or other-
wise to the boiling temperature. During the boiling operation the mixture is well
agitated by mechanical stirrers, or, as I prefer, by injecting air. The sulphur or
sulphur compounds in the mixture are acted on by freo lime or alkali which is present,
and are converted into soluble sulphides, which are subsequently removed by settling
or washing. The solutions or washings obtained may be used instead of water in
preparing the cream of: alkali waste for Chance's sulphur-recovery process, the
sulphur they contain being recovered in that process.
.
The mud from Chance's process may be mixed with milk of lime instead of the
mud from the causticising process; and the mud from the causticising process may
be treated by itself. If in a mixture of the two kinds of inud there is not sufficient
free lime or alkali for the sulphur or sulphur compounds present, some milk of lime
may be added to the mixture. When mud from the causticising process is treated by
itself air must be blown through it during the boiling operation.
The treated material after being washed may be mixed with a proper proportion of
clay for making cement, and the mixture may be passed through a filter press. The
cakes obtained may be dried at once, or the material may be moulded into bricks, and
be then dried, and so rendered suitable for calcination, and subsequent operations.
Or the treated material may be filtered without previous admixture with clay, and
if required it may be dried or otherwise rendered suitable for sale, or for being used
over again in the alkali manufacture.
When making Portland or similar cement the clay may be mixed with the treated
material in the same vessels in which the preparatory treatment is conducted.
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
1. The treating of impure carbonate of lime or lime residues from the causticising
process of the alkali manufacture and from Chance's process for recovering sulphur
from alkali waste, by mixing beating and agitating the two residues and separating
soluble matters from the resulting material substantially as and for the purposes
herein before described.
2. The treating of the lime residue from Chance's process with milk of lime,
heating, and agitating the mixture, and separating soluble matter substantially as and
for the purposes hereinbefore described.
3. The using of the washings or solutions obtained in the processes hereinbefore
described in making cream of alkali waste for Chance's process.
4. The treating of the lime residue of the causticising process of the alkali manu-
facture by heating it and blowing air through it substantially as and for the purposes
hereinbefore described.
Dated this Twenty-fifth day of June 1880
EDMUND HUNT,
Applicant's Agent.