Improvements in or appertaining to Basio Lined Furnaces.
Year: 1891

page_text: Date of Application, 18th Aug., 1891
Complete Specification Left, 31st Oct., 1891-Accepted, 5th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in or appertaining to Basio Lined Furnaces.
I, JOHN HENRY DARBY of Brymbo in the County of Denbigh, North Wales,
Metallurgist, do hereby declare the nature of this invention to be as follows:
Many furnaces are so constructed that the hearth for containing the bath of
metal is made of basic or neutral material while the sides, roof and ends are
made of silicious bricks, etcetera. By the splashing of the slag and the basic dust
in the furnace when at work the acid portions of the furnace are more or less
quickly fluxed away and the life of the furnace reduced thereby.
My invention relates to improvements in the construction of the furnace-so as to
lengthen its life in the way hereafter to be described..
For the sake of illustration, I will describe how my invention may be applied to
a basic lined open hearth steel furnace, but I do not in any way limit myself to this
class of furnace.
The side walls of such a furnace, especially that opposite to the charging doors,
are cut away faster than the other parts of the furnace by the splashing of the
basic slag and the basic dust in the furnace when at work. I propose to build the
furnace as usual and, when the side walls are being put in, to leave a space of two
to three inches between the acid bricks and the metal casing. This space I ram up
with ground chrome ore and tar, magnesia and tar, or any other suitable material
capable of withstanding the action of the basic slag, etcetera. It will be found when
the inside casing of bricks is fluxed away that the layer of refractory material
described above will have become dense and hard' and will protect the metal casing
from the heat for a long period, thereby prolonging the life of the furnace.
Dated this 17th day of August 1891.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or appertaining to Basic Lined Furnaces.
I, JOHN HENRY DARBY of Brymbo in the County of Denbigh, North Wales,
Metallurgist, 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 :-
Many furnaces are so constructed that the hearth for containing the bath of
metal is made of basic or neutral material while the sides, roof and ends are made
of silicious bricks, etcetera. By the splashing of the slag and the basic dust in the
furnace when at work the acid portions of the furnace are more or less quickly
fluxed away and the life of the furnace reduced thereby.
My invention relates to improvements in the construction of the furnace so as to
lengthen its life in the way hereafter to be described.
For the sake of illustration, I will describe how my invention may be applied to
a basic lined open hearth steel furnace, as set forth in the accompanying drawing,
but I do not in any way limit myself to this class of furnace.
The side walls of such a furnace, especially that opposite to the charging doors,
are cut away faster than the other parts of the furnace by the splashing of the
basic slag and the basic dust in the furnace when at work. I propose to build the
furnace as usual and, when the side walls are being put in, to leave a space of two

page_text: to three inches between the acid bricks and the metal casing. This space I ram up
with ground chrome ore and tar, magnesia and tar, or any other suitable material
capable of withstanding the action of the basic slag, etcetera. It will be found
when the inside casing of bricks is fluxed away that the layer of refractory material
described above will have become dense and hard and will protect the metal casing
from the heat for a long period, thereby prolonging the life of the furnace.
Referring to the drawing:
:-
A A are basic linings shown in alternate full line and dot line; B B walls and
roof of furnace shown in coarse hatching; C chrome ore and tar or other material
of like nature shown in fine hatchings rammed in as described; D a layer of similar
material protecting the face of the junction of the sides with the basic lining;
E metallic framework of furnace.
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 I am
well aware that chrome ore, etcetera, has been used as a separator between basic and
acid portions of a furnace, and I therefore make no claim for this but that what
I claim is
The improvements in or appertaining to basic lined furnaces which consist in the
combination, with basic lining and acid walls, of a layer of chrome ore and tar,
magnesia and tar or other carbonaceous or neutral refractory substance, arranged
substantially as and for the purposes described.
Dated this 30th day of October 1891.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.