Improvements in Apparatus for Dressing Ores.
Year: 1890

page_text: Date of Application, 10th Sept., 1890
Complete Specification Left, 10th June, 1891-Accepted, 11th July, 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Dressing Ores.
I, ROBERT DAVY BOWMAN, of No. 80, Lordship Lane, Dulwich, in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to improvements in tables for dressing ores, and consists in
an improved construction of the table, in combination with the application of
hydraulic agencies adapted to effect, first, the dissociation of the ore from the gangue,
and secondly, the removal of the said gangue from the ore. In carrying the inven-
tion into effect, the table has formed across it a series of corrugations of a suitable
depth. In addition to this, it is fixed on the slope, i.e., at an angle with the horizon,
and a jigging motion is imparted to it by any suitable mechanism.
The present invention is specially suitable for the treatment of ores containing
precious metals.
Over each trough of the table 1 cause to depend a number of pipes through which
water is forced under suitable pressure.
The width of the table is regulated by the amount of crushed orc to be treated;
but the length of it and, consequently, its number of corrugations, is decided by the
number of times the relative specific gravities of the ore and gangue require them
to be subjected to the action of the water jets before their complete dissociation is
effected.
The operation of my invention is as follows:-
The crushed ore from the pulverizers is spread over the top of the table, already
on the jig, and then drops into the first trough. The water jets subject the whole
mass of ore and gangue to a vigorous ebullient motion, during which the particles
of metal or of metallic ore tend to remain within the trough, in virtue of their
weight, while the particles of gangue, being too light to withstand the action of the
water jets, are carried down the table. The process of dissociation may not be
effected in the first or second troughs, but the metallic grains which are carried out
of the upper troughs will settle in some of the lower ones, so that when the
operation is completed, the contents of all the troughs will consist of metallic sub-
stances only.
Dated this 10th day of September 1890.
PHILLIPS & LEIGH,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Dressing Ores.
I, ROBERT DAVY BOWMAN, of No. 80, Lordship Lane, Dulwich, in the County
of Surrey, Engineer, 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 in apparatus for dressing ores, and consists
in an improved construction of the table in combination with the application of
hydraulic agencies adapted to effect, firstly, the dissociation of the ore from the gangue,
and secondly, the removal of the gangue from the ore. It is specially suitable for
the treatment of ores containing precious metals.
In order that my invention, and the best means by which it can be carried into
practical effect, may be thoroughly understood, I will now describe them in detail,
Price Rd 1

page_text: of this Specification and read therewith.
Fig. is a side elevation partly in section.
Fig. 2 is a plan of Fig. 1.
a is the pulverizer; and a', the shoot down which the crushed and sieved ore is
delivered.
bis the table. It is hung on the links & which have their axes upon the frame
of the apparatus, and inclines downwards from the shoot a towards the front of the
apparatus.
e is a half-crank driven, preferably, from the pulverizer shaft; and a link
connecting it to the table, through which link the rotary motion of the said half-
crank is converted into a jigging one in the table. I do not confine myself to the
mechanism illustrated for producing the said jigging motion, but may use any that
may be convenient or suitable.
are transverse corrugations or troughs in the table. The depth and width of
these are adapted to the particular ore to be treated.
The width of the table, and consequently the capacity of the apparatus, is decided
by the quantity of crushed ore which has to be treated in a given time; but the
length of it, and consequently the number of troughs, is decided by the number of
times the respective specific gravities of the ore and gangue require them to be
subjected to the action of the water before their complete dissociation is effected.
With reference to the size of the corrugations, which of course regulates the
width and depth of the troughs, I have to point out that these will naturally vary
according to the nature of the stuff to be treated. The troughs should be deep
enough to hold the particles of metal and still leave room enough for the dissociating
process to proceed in the upper portions of the troughs, so that it may not be
necessary to keep clearing the metal out of the latter. Practical considerations
therefore of the quantity of work to be done in a given time, the nature of the stuff”
as well as of the percentage of or to gangue will always be necessary, and may
always be relied on as trustworthy guides in settling the dimensions and number of
troughs.
dis a pipe standing across the head of the table. It has one or more rows of
perforations along its front, through which jets of water dare forced down upon
the table into the top trough. Instead of there being only one transverse pipe, as
illustrated in the figures, there may be one appropriated to each of as many of the
troughs as may be thought desirable.
e is a catching trough to catch the gangue and any metallic grains which may be
accidentally washed out of the bottom trough.
The operation of my invention is as follows:-
When the table has been started on the jig, the supply of the crushed ore down
the shoot a on to the head of the table b is commencod, when it drops into the first
or top trough. The water jets subject the whole mass of ore and gangue to a
vigorous ebullient motion during which the particles of metal or of metallic ore
tend to remain in the troughs in virtue of their weight, while the particles of
gangue, being too light to withstand the action of the water-jets, are carried down
the table.
The process of dissociation may not be effected in the first or second troughs.
However, any metallic grains which may be carried out of the upper troughs will
settle in some of the lower ones, so that when the operation is complete, the contents
of the troughs will consist of metallic substances only.
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-
1. The combination of inclined table, transverse troughs therein, a transverse
nina ndanted to deliver iots of water into the ton trough and a fiveitu or as sot

page_text: 2. The combination of inclined table, transverse troughs therein, transverse pipes
adapted to deliver jets of water into the respective troughs, and a jigging gear as
set forth.
Daind this 10th day of June 1801
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.
PHILLIPS & LEIGH,
22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.