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

page_text: Date of Application, 8th Oct., 1890
Complete Specification Left, 8th July, 1891-Accepted, Eth Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Lining Boilers or Digesters used in the Manu-
facture of Paper Pulp and for other similar purposes.
I CARL KELLNER of 8 Bartensteinsgasse Vienna in the Empire of Austria
Chemist do hereby declare the nature of this invention to be as follows a
==
This invention relates to improvements upon an invention which formed the
subject matter of an application for Letters Patent No. 6951 dated May 6th 1890
the object of the present invention being to improve the acid resisting qualities of
the inner lining and to dispense with the intermediate coating mentioned and
described in the Specification of the Letters Patent above referred to.
After cleaning the internal surface of the metal boiler or digester I apply thereto
a first coating formed principally of silicate of alumina, and preferably made from
ground slate mixed into a paste with a solution of silicate of soda or water-glass as
previously described.
Upon this first coating or preparation I then apply a final coating or lining of
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Lining Boilers or Digesters used in the Manu-
facture of Paper Pulp and for other 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 upon an invention which formed
the subject matter of an application for Letters Patent No. 6951 dated
May 6th 1890 the object of the present invention being to improve the acid
resisting qualities of the inner lining and to dispense with the intermediate coating
mentioned and described in the Specification of the Letters Patent above
referred to.
After cleaning the internal surface of the metal boiler or digester I apply thereto
a first coating formed principally of silicate of alumina, and preferably made from
ground slate mixed into a paste with a solution of silicate of soda or water glass as
described in the Specification previously mentioned, either with or without the
addition thereto of burnt clay tiles, ground to a powder.

page_text: Upon this first coating or preparation I then apply a final coating or lining of
cement composed as follows:
About One part of ground slate
Two parts of ground glass, and
One part of Portland cement,
all ground to a fine powder and mixed together into a paste by the addition of a
weak solution of silicate of soda or water glass (about 20° Twaddell).
The addition of the ground glass and the use of the weak solution of water glass
instead of plain water to form the cement will be found greatly to increase the.
insolubility of the lining and to improve its acid resisting qualities.
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
The improvements in lining boilers or digesters used in the manufacture of paper
pulp and for other similar purposes consisting in the combination with a preparatory
layer formed principally of silicate of alumina (either with or without the addition
of ground clay ware) of a cement composed of about one part of ground slate two
parts of ground glass, and one part of Portland cement all ground to a fine powder
with the addition of a weak solution of silicate of soda substantially as and for the
purposes specified.
Dated this 7th day of July 1891.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.