An Improved Magnesian Cement, applicable for the Manufacture of Artificial Stone, Emery Wheels, Billiard Ball Compositions, and for other purposes.
Year: 1898

page_text: Date of Application, 14th Sept., 1898
Complete Specification Left, 12th June, 1899-Accepted, 29th July, 1899
PROVISIONAL SPECIFICATION.
An Improved Magnesian Cement, applicable for the Manufacture of
Artificial Stone, Emery Wheels, Billiard Ball Compositions, and
for other purposes.
I, JAMES WILLIAM BUTLER, of Blyth House, Humber Road, Blackheath, in the
County of Kent, Manufacturer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to improvements in the manufacture of magnesian cement
whereby it is rendered capable of withstanding moisture.
In carrying out my invention I take magnesite preferably that found in
Euboea or Greece, or magnesian limestone preferably that from Mansfield Wood-
house, Bolsover or elsewhere and having calcined the same in a suitable kiln I
take the oxide and reduce it to a fine state of division and add to it about equal
quantities of chloride of magnesium and anthracite or bituminous coal-ash. The
mixture is treated in a steam heated pan provided with a mixer or stirrer until
it reaches a state of siccity. To the dry mixture I add about 2% of sulphate of
alumina or sulphate of potash and about 2% of the dry soap of commerce the
whole being thoroughly mixed together when it is ready for use.
I find the magnesian cement thus produced successfully resists damp, does not
contract or expand and is free from the deliquescence so often seen in the stone
made with oxide of magnesia and mixed with the chlorides.
My improved magnesian cement can be used for all purposes for which such
cements have hitherto been employed, such for example, as the manufacture of
artificial stone, emery wheels, mill stones, grindstones, hones and the like, for the
agglomeration of sawdust, peat or other materials, for the manufacture of billard
balls, etc., etc.
10 11 7
1
1040
G. F. REDFERN & Co.,
4, South Street, Finsbury, London.
Agents for the Applicant.
An Improved Magnesian Cement, applicable for the Manufacture of
Artificial Stone, Emery Wheels, Billiard Ball Compositions, and
for other purposes.
I, JAMES WILLIAM BUTLER, of Blyth House, Humber Road, Blackheath, in the
County of Kent, Manufacturer, do hereby declare the nature of this invention
011

page_text: and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement;-
-
This invention relates to improvements in the manufacture of magnesian
cement whereby it is rendered capable of withstanding moisture.
In carrying out the invention I take magnesite found in Euboea or Greece
and having calcined it in a suitable kiln I reduce it to a fine state of division and
add to it chloride of magnesium, which has been reduced to a state of siccity by
being boiled in a suitable steam jacketted receptacle with about the same bulk
of ashes of anthracite or bituminous coal, by preference the former. To the dry
mixture thus formed I add about 2% of sulphate of alumina or sulphate of potash
and about 2% of the dry soap of commerce. I find the magnesian cement thus
produced successfully resists damp, does not contract and is free from the deli-
quescence so often seen in the stone made with oxide of magnesium and mixed
with the chlorides.
I may use different proportions in the mixture of the various ingredients
but I find that the addition of from 25% to 33% of the dry chloride of magnesium
makes a good mixture with the oxide of magnesium and that the addition to
this mixture of 2% of sulphate of alumina or sulphate of potash and 2% of dry
soap gives good results.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what
I claim is
1. The described process for the manufacture of cement, such process consist-
ing in calcining magnesite of Euboea or Greece, in adding thereto chloride of
magnesium and ashes of anthracite or bituminous coal reduced to a state of siccity
and in adding to the dry mixture thus formed sulphate of alumina or potash
and dry soap, substantially in the manner and in the proportions herein before
described.
2. The use in the manufacture of magnesian cement of a mixture of chloride
of magnesium and ashes of anthracite or bituminous coal reduced to a state of
siccity, substantially as hereinbefore described.
3. In the manufacture of magnesian cement the employment of sulphate of
alumina or potash and dry soap, substantially as hereinbefore described.
4. Magnesian cement for the manufacture of artificial stone, emery wheels,
billiard ball compositions and for other purposes made substantially as herein-
before described."
Dated the 12th day of June 1899
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.