Improved Lining for Boilers or Vessels used in the Manufacture of Paper and other Pulp.
Year: 1890

page_text: Improved Lining for Boilers or Vessels used in the Manufacture of
Paper and other Pulp.
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 the lining of the boilers or digestors usually made of
wrought iron or steel which are used for the treatment of wood or other fibre
with acid sulphites or other corrosive compounds in the manufacture of paper and
other pulp.
These boilers or digestors are usually lined with sheet lead in several sections
various devices being employed for securing the lead to the iron or steel and for
making good the joints between the edges of the sections by means of soldering or
burning with the blow pipe or by covering strips or blocks or other equivalent means,
but in all cases as hitherto applied the sheet lead was liable to become loose owing
mainly to the unequal expansion and contraction of the iron or steel and the lead
when exposed to the action of beat, the lead itself became in course of time seriously
deteriorated and in some cases corroded and even perforated by the action thereon of
the acid sulphites or other chemical solutions employed.
The object of my invention is to remedy these defects and thus to increase the
durability of the lining of such vessels and consequently to economize cost and prevent
damage.
My invention consists in the combination or mixing together for the purposes
above referred to with the lead, of a small proportion of antimony which will not
only harden the lead so as to prevent it from bulging or "creeping" and thus
becoming loosened from the interior surface of the iron or steel vessel, but it will
also have the effect of preventing the deleterious action of the acid sulphites or other
corrosive compounds, upon the lead and thus will materially increase the durability
of the lining.
The linings made of the combination of antimony with lead as above mentioned
he secured in any of the methods now in use.
may
To the lead for forming the sections of the lining (which is usually rolled into
sheets) I find that the addition of from about one to two per cent. of antimony is
best to impart the requisite hardness without making the lead too brittle or reducing
its flexibility or ductility too much; whilst for the blocks for covering the joints of
the sections (which are usually cast) I find that from four to five per cent. of antimony
may be added with most advantage.
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 I
claim is
The improved lining, for boilers used in the manufacture of paper and other
pulp, formed by the combination with lead of a small proportion of antimony (say
from about one to five per cent.) substantially as and for the purposes hereinbefore
set forth.
Dated this 25th day of April 1800
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.