IMPROVED MEANS FOR DISCHARGING CALCINED ORES FROM the Furnace, oR CRUSHED ORES FROM OTHER SOURCES, AND FOR WASHING AND SEPARATING SUCH ORES
Year: 1875

page_text: PROVISIONAL SPECIFICATION left by John Hall at the Office of the
Commissioners of Patents, with his Petition, on the 27th February
"
1875.
I, JOHN HALL, of Chacewater, in the County of Cornwall, do hereby..
declare the nature of the said Invention for "IMPROVED MEANS FOR
DISCHARGING CALCINED ORES FROM the Furnace, oR CRUSHED ORES FROM OTHER
SOURCES, AND FOR WASHING AND SEPARATING SUCH ORES," to be as follows:-
My Invention consists in the apparatus or machinery herein-after
described to be employed in lieu of hand labour for withdrawing the
calcined ores from the calcining furnace, and also for washing and
separating by machinery such ores as they are being discharged, to
render them fit for further purification on the dressing floors.
By the adoption of this Invention the prejudicial steam and fumes are
avoided, whereby health and labor are saved and accidents prevented, and
all danger in the process is removed.
་

page_text: The ore calciners to which my Invention is most easily applied are
those which are on the revolving principle, though I do not confine my
Invention to any particular kind as it may be adapted to any ordinary
calciner in use without any material alteration. Attached to all
ordinary calcining furnaces is a small chamber for receiving the hot
calcined ore called a "wrinkle." In this small chamber, immediately
below the mouth of the calciner, but preferably at right angles thereto,
I embed by means of brick, stone, or other work a tube having an
opening in the top at the end nearest the calciner and terminating at its
other end in a small close chamber termed the "wetting" chamber.
Within this tube is fitted an archimedian screw conveyor which extends
throughout the tube from the opening beneath the calciner to the
wetting chamber. Immediately over the said opening in the tube is
fixed an inclined grate whose interstices are regulated according to the
requirements of the work, the upper end of said grate being under the
mouth of the calciner while its lower end terminates in a chambered
shoot which opens out to the wall of the dressing floor. The archimedian
screw may be composed of a series of plates of cast iron, fire clay, or other
suitable material, on a core fixed on a shaft mounted in bearings in the
tube and prolonged at one end for gearing with a water wheel or other
motor whereby to revolve the screw within the tube.
The wetting chamber is supplied with water from a tank or otherwise,
and from the bottom of said chamber an inclined launder or tube leads
to a separator consisting of a concave perforated plate of metal supported
above a small tank or box having an outlet launder leading to the buddle
or other part of the dressing floor. A revolving brush or besom is made
to work over the concave surface of the said separator, at the back of
which there is a second channel or launder communicating with a set of
stamps which empty into the launder above mentioned leading to the
buddle or other part of the dressing floor.
'
The operation of my Invention is as follows:-The calcined ore in
falling from the mouth of the calciner is separated by the grate, through
which the finer portions pass into the conveyor tube, while the larger
lumps pass over the grate into the chambered shoot whence they are
drawn and re-stamped.
The sifted ore arriving in the tube is conveyed along it by the
revolving screw, and continuously discharged into the wetting chamber

page_text: where it is met by a stream of water which cools the hot ore, the steam
or fumes being allowed to escape. From this wetting chamber the
mixture of ore and water passes to the separator, the water and fine ore
passing through the perforations into the tank beneath, and thence by
the launder to the buddle or other part of the dressing floor.
The larger
pieces of ore left on the separator are swept off by the revolving brush.
into the channel or "pass," through which they are conducted by a flow
of water into the stamps, there to be re-stamped and passed off through
the launder to the buddle or elsewhere.