Improvements in Lining Boilers or Digesters used in the Manu- facture of Paper-pulp and for similar purposes.
Year: 1890

page_text: Date of Application, 6th May, 1893
Complete Specification Left, 22nd Dec., 1890-Accepted, 24th Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Lining Boilers or Digesters used in the Manu-
facture of Paper-pulp and for similar purposes.
I CARL KELLNER of 8 Bartensteingasse Vienna in the Empire of Austria Chemist
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements on an invention which formed the subject
matter of an application for Letters Patent No. 2061 dated February 8th 1890, the
object of the present invention being to prepare the surface of the iron or steel hoiler
or digester in such a manner that the lining of Portland or other cement shall adhere
thereto with an increased tenacity and generally to improve the acid-resisting qualities
of the lining.
For this purpose after cleaning the internal surface of the iron or steel boiler or
digester I first apply a coating of the following cement which has the property of
adhering tenaciously to the bare metal, and also of forming a kind of flux or medium
to cause the cement lining 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 silicate of
suda, 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 I 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
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.
This lining 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.
"
"
1000
COMPLETE SPECIFICATION.
Improvements in Lining Boilers or Digesters used in the Manu-
facture of Paper-pulp and for similar purposes.
I CARL KELLNER 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:
This invention relates to improvements on an invention which formed the subject
matter of an application for Letters Patent No. 2064 dated February 8th 1890, the
objects of the present invention being to prepare the surface of the iron or steel boiler
or digester, in such a manner that the lining of Portland or other cement shall adhere
thereto with an increased tenacity, and generally to improve the acid resisting qualities
of the lining.

page_text: For this purpose after cleaning the internal surface of the iron or steel boiler or
digestor I first apply a coating of the following cement which has the property of
adhering tenaciously to the bare metal and also of forming a kind of flux or inedinin
to cause the cement lining 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 tako 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 a
solution of silicate of soda (or "water-glass"). "I lay this preparatory coating (say)
about half an inch thick, and, it will be found to adharu tenaciously to the clean surface
of the bare metal.
For a second coating I thon take equal quantities of ground slate, and Portland or
Roman cement (preferably the former) and 1 mix these together into a paste or
cement with water, and I lay this over the first conting to a similar thickness."
I then mix Portland or Roman cement (preferably the former) alone with water
and lay this on over the second coating and thus form the inner surface of the lining
which thus consists of three coats, the two first cunts being preferably left rough to
facilitate the adhesion.
First. Ground slate made into a paste with "water glass."
Second. Half ground slate, and lalf Portland cement mixed with water.
Third. Portland cement only mixed with water, or with a weak solution of "water
glass" but in some cases the intermediate or second coating may be dispensed with.
This compound lining will be found to resist the action of the corrosive acids and
alkalies under great heat, and also to adhere tenaciously 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 inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
The herein described methods of forming the lining for boilers or digesters used
in the manufacture of paper pulp and for other similar purposes substantially as
hereinbefore particularly described.
Dated this 20th day of December 1890.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.