Improvements in Coating Iron, Steel, or other Metals or Materials with Portland or other Cement.
Year: 1890

page_text: Date of Application, 6th May, 1890
Complete Specification Left, 5th Feb., 1891-Accepted, 21st Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Coating Iron, Steel, or other Metals or Materials
with Portland or other Cement.
1, CARL KELLNER, of 8, Bartensteingasse, Vienna, in the Empire of Austria,
Chemist, do hereby declare the nature of this invention to be as follows:-
The principal object of this invention is so to cause a coating of Portland or
other cement to adhere firmly to the surface of iron steel or other metal that it will
form a protective coating thereto which will be both acid or alkali resisting as well
as fire-resisting.
It is applicable to a great variety of structural purposes where it is desirable to
render iron steel or other metals practically indestructible either by acid or alkaline
liquids or vapors or by the action of fire.
።
It may also be employed for lining vessels or tanks made of brickwork such for
example as stuff chests," and rag engines used in the manufacture of paper, and,
for other purposes where it is desirable to employ an internal or external coating of
Portland or similar cement without liability to crack or laminate off when exposed
to corrosive acids alkalies or heat.
For this purpose I first apply a coating of the following cement which has the
property of adhering tenaciously to the bare metal or other material and also of
forming a kind of flux or medium to cause the cement lining or coating to adhere
thereto.
This first coating is formed principally of silicate of alumina and find the
following to be a suitable composition for this purpose.
I take blue slate such as is obtained from Wales, and other places which I grind
up into a fine powder and then mix up into a paste with a suitable quantity of silicate
of soda or water-glass thus forming a double silicate.
I lay this coating on (say) about half an inch thick.
For a second coating I then take equal quantities of ground slate and Portland
or Roman cement (preferably the former) and mix these together into a paste
with water and I lay this over the first coating to a similar thickness.
I then mix Portland or Roman cement (preferably the former) alone with water
and I lay this on over the second coat and this forms the inner surface of the lining
or covering which thus consists of three coats.
66
First. Ground slate made into a paste with water-glass."
Second. Half ground slate and half Portland cement mixed with water.
Third. Portland cement only mixed with water.
This lining or conting will be found to resist the action of the corrosive acids, and
alkalies under great heat and to adhere to the surface of the iron or steel without
any liability to crack or become detached.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Coating Iron, Steel, or other Metals or Materials
with Portland or other Cement.
1, Carl KellsER. of 8, Bartensteingasse, Vienna, in the Empire of Austria,
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 :—
The principal object of this invention is so to cause a coating of Portland or other
cement to adhere firmly to the surface of iron steel or other metal that it will form
a protective coating thereto which will be both acid or alkali resisting as well as
fire resisting
It is applicable to a great variety of structural purposes where it is desirable to
render iron steel or other metals practically indestructible either by acid or alkaline
liquids or vapors or by the action of fire.
It may also be employed for lining vessels or tanks made of brickwork such for
example as "stuff-chiests "and rug engines used in the manufacture of paper and for
other purposes where it is desirable to employ an internal or external coating of
Portland or similar cement without liability to crack or laminate off when exposed
to corrosive acids alkalies or heat.
For this purpose I first apply a coating of the following cement which has the
property of adhering tenaciously to the bare metal or other material and also of
forming a kind of flux or medium to cause the cement lining or conting to adhere
thereto.
This first coating is formed principally of silicate of alumina, and I find the
following to be a suitable composition for this purpose.
I take blue slate such as is obtained from Wales, and other places which I grind
up into a fine powder, and then mix up into a paste with a suitable quantity of
solution of silicate of soda or "water-glass thus forming a double silicate.
"
The proportions used are the following: For every 100 pounds of ground slate,
I use about 30 or 40 pounds of a solution of silicate of soda, having a strength
100° Twaddel.
I lay this coating on (say) about half an inch thick.
For a second conting I then take equal quantities of ground slate, and l'ortland
cement (preferably the former) and mix these together into a paste with water
and lay this over the first coating to a similar thickness.
I then mix Portland or Roman cement (preferably the former) alone with water
and I lay this on over the second coat and this forms the inner surface of the lining
or covering which thus consists of three coats.
First. Ground slate made into a paste with water-glass.
Second. Half ground slate and half Portland cement mixed with water.
Third. Portland cement only mixed with water.
I find it better in some cases, more especially for acid resisting purposes to modify
the second coating by the addition of glass ground to a fine powder; that is to say
about one third ground glass, one third ground slate and one third Portland cement
mixed with water, and when this second conting is used in place of half ground
slate and half Portland cement the third coating may be dispensed with.
This lining or coating will be found to resist the action of the corrosive acids and
alkalies under great heat and to adhere to the surface of the iron or steel without
any liability to crack or become detached.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
First. The improvements in coating iron steel or other metals or materials with
Portland or other cement consisting in the combination with such metal or material

page_text: and cement, of an intervening layer of ground slate and water glass (or other
equivalent form of silicate of alumina) substantially as and for the purposes
specified.
Secondly. A compound cement coating composed of a preparatory layer con-
sisting mainly of silicate of alumina combined with a subsequent layer of ground
slate, ground glass, and Portland cement substantially as and for the purposes
described.
is 4th day of February 1891.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.