Improvements in or relating to the Utilization of the Lime-mud Refuse of Sugar and other Industries for Cement and other Púrposes.
Year: 1888

page_text: Date of Application, 19th May, 1888
Complete Specification Left, 28th Nov., 1888
Complete Specification Accepted, 6th Apr., 1889,
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Utilization of the Lime-mud
Refuse of Sugar and other Industries for Cement and other
Púrposes.
I, JOHN SAMUEL RIGBY, of 35, Bagot Street, Liverpool in the County of
Lancaster, Manufacturing Chemist, do hereby declare the nature of this invention to
be as follows:-
This invention has for its object the manufacture of cement from other limemuds
than those of the alkali manufacture for which I have applied for or already obtained
Letters Patent, namely lime mud obtained in the manufacture of sugar, borax, and any
other chemicals where line is precipitated by carbonic acid or is used to separate
carbonic acid from solutions.
To make cement from this mud I first analyse it and ascertain what deleterious salts,
sand, or other like material sufficient there are, likely to interfere with the cement
manufacture. If there be sulphides, alkaline earth chlorides, or caustic earths present
I separate the sulphides by means of carbonic acid, make the chlorides less deleterious
by adding silicate of soda so as to form alkaline chlorides instead of alkaline earth
chlorides; and if there be caustic alkali 1 well wash it; if there be caustic alkaline
earth in it I treat it with carbonic acid sufficient to neutralize the same.
The lime mud so purified is now mixed with clay or other earthy silicates in the right
proportion to form the cement when thoroughly mixed it is calcined in a kiln from
which the carbonic acid can be saved and this carbonic acid is used in forming
more line mud or decausticising. The cement is then ground and laid on floors in
the usual manner.
In this way the lime mud of the sugar works for instance which has hitherto been
a waste product difficult to get rid of is now made useful in the manufacture of the
sugar itself as by this means the expense of lime stone hitherto employed to make
carbonic acid is obviated.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant,

page_text: Improvements in or relating to the Utilization of the Lime-mud
Refuse of Sugar and other Industries for Cement and other
Purposes.
I, JOHN SAMUEL RIGBY of 35, Bagot Street, Liverpool in the County of
Lancaster, 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:-
This invention has for its object the manufacture of cement from lime muds
(mainly carbonate of lime) other than those of the alkali manufacture for which I
have applied for or already obtained Letters Patent, Nos. 10244 of 1887, 11274
of 1887, and 3148 of 1888, namely, lime mud obtained in the manufacture of sugar,
and any other chemicals where lime is precipitated by carbonic acid or is used to
separate carbonic acid from solutions.
To make cement from this mud I first analyse it and ascertain what deleterious
salts and mechanical impurities it contains. If there be sulphates, sulphides, alkaline
earth chlorides, or caustic earths present, I first treat with carbonic acid in a closed
chamber whereby the caustic alkaline earths are carbonated and any caustic alkali
or other salts held by them liberated; when the sulphur of the sulphur compounds
is driven off as sulphuretted hydrogen. If there be sulphate of lime present the
mass is also treated with monocarbonate of soda solution (vat liquor) to dissolve out
or decompose the sulphate. It is then well washed to remove all soluble matters,
if alkaline earth chlorides be present, an alkaline silicate is added in sufficient
quantities to convert the alkaline carth chlorides into alkalino earth silicates and
alkaline chlorides, which may then. be washed out at once or after mixing with the clay
and water. The lime mud so purified is now mixed with clay or other carthy
silicates in the right proportion to form the cement either in the wet or dry state
(the proportions in the wet state being about five lime mud to one clay) when
thoroughly mixed it is dried in the usual manner on beds, or the excess of water may
be separated by means of a filter press or filter bed, the comparatively dry slurry
may then he dried by suitable appliances and calcined in a kiln from which the
carbonic acid can be saved, and this carbonic acid is used in treating the crude
carbonate of lime containing sulphides. The cement is then ground and laid on
floors in the usual manner.
In this way the lime mud of the sugar works, for instance, which has hitherto been a
waste product difficult to get rid of, is now made useful in the manufacture of the sugar
itself, as by this means the expense of lime stone hitherto employed to make
carbonic acmay be obviated, the carbonic acid from the cement kiln being used for
this purpose.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
[ claim is :-
1. The elimination or making lime mud practically harmless of the ingredients
noxious for cement making in lime mud such as described, and the manufacture of
the treated lime mud into hydraulic cement, substantially as and for the purposes
herein described.
2. The utilization of the carbonic acid obtained by the cement manufacture for
decomposing saccharate of lime or for other industrial process in which lime mud
is formed or treated by means of carbonic acid-whereby the manufacture of
carbonic acid in a lime kiln specially for the purpose is obviated.
Dated th: 07:1
CAT
1000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool,
Patent Agents for the Applicant.