Year: 1886

page_text: Date of Application, 7th July, 1886.
Complete Left, 7th Apr., 1887.
Complete Accepted, 10th May, 1887.
do hereby declare the nature of this invention to be as follows:-
My invention relates to improvements in dressing or separating ores from the
accompanying waste and in apparatus therefor, part of the apparatus being applicable
for treating other minerals, such as china clay.
The process of this invention comprises the following series of operations effected
by the apparatus which I will proceed to describe as applied to the dressing of tin
ores.
The crushed or pulverized ore from the stamps or other pulverizing machinery is
conveyed through a launder formed by two or more V grooves having an outlet in
the bottom of the groove situated beneath a transverse division or covering plate
which separates the stream into an upper and lower layer at the point where the
outlet is situated and prevents the exit of the lower layer through the outlet having.
inductive action on the upper layer.
any
دو
This outlet is situated at such a distance from the serving end of the launder as to
give the heavier and larger grains termed rows or "roughs" time to settle before
reaching the outlet above mentioned. The "roughs" are discharged from this outlet
into a "jigger" consisting of a trough pivoted at one end and having a sieve in the
bottom at the free end, the same being jigged in a tank of water, the heavy mineral
passing through the sieve and the waste rejected by the jigging action flowing out at
the tail of the "jigger."
The remainder is passed on through the launder to a self-acting cylindrical sieve or
trommel, whereby the greater portion of the waste is separated from the mineral.
This apparatus consists of a cylindrical sieve of wire-cloth or silk gauze surrounded
by trough-like buckets and mounted to rotate on a slightly inclined axis, or preferably
the sieve is slightly conical and the water-wheel portion cylindrical and mounted on a
horizontal axis.
The launder feeds at the upper or smaller end and against one side of the rotary
sieve which is driven by the weight of the water in the surrounding buckets. The
tailings which pass out at the lower or larger end of the sieve are entirely waste.

page_text: whilst the water and valuable portion of the mineral and some waste pass through the
sieve, and are discharged by the buckets and conveyed to a self-acting rotary buddle
on to which the launder discharges in a tangential direction so as to assist in its
rotation.
This apparatus is composed of a surface of wire gauze in the form of a flat cone
stretched upon a sort of horizontal water-wheel or turbine having blades so arranged
as to be driven by the water falling from the gauze.
The apparatus is mounted to rotate on a vertical axis above a separating pit into
which the buckets of the turbine discharge whilst the waste passing down the gauze
surface is thrown off.
The pit is of the usual circular form and the separation of the heavier portions of
the mineral is effected therein in the usual manner and may be classified into heads,
middles and tails for the purposes of the subsequent treatment in the usual way.
The water and slimes from the separating pit pass into a filter tank through a shoot
leading down to the bottom thereof and discharging beneath a horizontal gauze
partition through which the water and some slime rises, and flows off at the top, the
mineral being kept from rising by the gauze which prevents eddies or currents of
water and so promotes the settlement of the mineral.
The mineral and slime deposited in the filter tank are drawn off at the bottom and
run on to a self-acting cylindrical sieve of wire or silk gauze stretched upon a drum
constituted by buckets and forming a sort of overshot water-wheel, the buckets being
inclined towards and discharging at the ends of the cylinder.
The waste is retained and thrown off by the sieve whilst the water and mineral pass
through and are further dealt with by "tossing" in the usual way.
Dated this 7th day of Inl.. 1000
H. BOYNS.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: Improvements in and in Apparatus for Dressing Minerals.
I, HENRY BOYNS of Bostrase, St. Just, West Penzance in the County of Cornwall,
Farmer, 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 dressing or separating ores from the
accompanying waste, and in apparatus therefor, part of the apparatus being
appplicable for treating other minerals, such as China Clay.
The
process of this Invention comprises the following series of operations effected
by the apparatus which I will proceed to describe (as applied to the dressing of tin
ores) with reference to the accompanying drawings forming part of this Specification,
wherein figure 1 represents a general view of the entire apparatus employed in the
series of operations about to be described, and figure 2 a part plan of same.
The remaining figures are separate views of the various portions of the apparatus
comprised in Figure 1. The same letters of reference indicate the same parts in all
the figures.
"
The crushed or pulverized ore from the stamps or other pulverizing machinery,
is conveyed through a launder A having an outlet in the bottom through which the
heavier and larger grains termed " rows or "roughs" are discharged into a jigger B
(separately represented in plan in figure 3) working in a tank of water C in which
the heavy mineral is received whilst the waste rejected by the jigging action flows out
at the tail of the "jigger." The mineral and "roughs" received in the tank is to be
buddled or tossed in the usual way. The remainder of the stream conveyed through
the launder A passes on to a self acting cylindrical sieve or trommel D (shown
separately in cross section in figure 4) whereby the greater portion of the waste is
separated from the mineral. The water and valuable portion of the mineral, and some
waste, pass through the sieve and are conveyed to a self-acting rotary buddle E
mounted to rotate on a vertical axis, above a separating pit F in which the valuable
portion of the mineral is received. The water and slimes from the separating pit F,
pass into a filter and settling tank G through a shoot leading down to the bottom of
the tank and discharging beneath a horizontal gauze partition gl therein. The
mineral and slime deposited in the filter tank G are drawn off at the bottom and run
on to a self acting cylindrical sieve H (shown separately in section and end view in
figure 5) forming a sort of overshot water wheel whereon the waste is retained and
thrown off by the sieve whilst the water and mineral pass through and are further
dealt with by "tossing," in the usual way.
Such being the general outline of the several operations, I will now proceed to
describe them, and the apparatus employed, more in detail.
The launder A, is formed by one, two, or more parallel V grooves (as shown in
cross section in figure 6), the outlet a being at the bottom of the groove and at such a
distance from the serving end of the launder (say 6 feet) as to give the "rows" or
3

page_text: "
"
roughs time to settle down to the bottom of the launder before reaching the
outlet. This outlet should be of such dimensions as not to let out more than one
third the bulk of the stream and it is situated beneath a partition plate a¹ extending
across the launder from side to side. This division plate a¹ separates the stream
passing through the launder, into an upper and lower stratum and its object is to
prevent the exit of the lower stratum through the outlet a from affecting the
onward flow of the upper stratum through the launder to the trommel D. If all
the "roughs" do not pass out at the said opening another smaller opening may be
provided beneath another partition plate, about four to six feet beyond the first one.
The "jigger" B on to which the "roughs" are deposited consists of a trough
hinged or pivoted at one end b and having a sieve b¹ (of 40 to 60 meshes to the inch)
in the bottom near the free end, the sieve extending about one third the length of the
trough. The "roughs" are deposited between the end of the trough and a partition 6*
therein, under which they pass and thence over the sieve. This end of the jigger
trough B is connected to a lever or other mechanical movement whereby a rapid
rising and falling or "jigging" motion may be imparted to the jigger whereby it is
rapidly immersed in and raised out of the water in the tank C, causing the heavy
mineral to pass through the sieve and become deposited in the tank whilst the waste
or "tailings" pass out at the open pivoted end of the jigger. The portion of the
bottom of the trough at which the sieve b¹ is situated, is approximately horizontal, the
remainder of the bottom of the trough being inclined downwards, towards the hinged
end which dips about six inches below the level of the water in the tank to which
it is fitted in such way as to prevent the escape of the water and permit of the
desired motion. The sieve portion in working has an up and down motion from the
surface of the water to about three inches below. This jigger differs from others
that dip and rise, inasmuch as it discharges itself.
The trommel D to which the remainder of the stream in the launder A is conveyed
as above mentioned, consists of a cylindrical sieve of wire cloth or silk gauze sur-
rounded by trough like buckets d. Instead of gauze, perforated sheet copper or zinc
may be used in certain cases. This trommel may either be cylindrical and mounted
to rotate upon a slightly inclined axis, or preferably the sieve portion d' d' is slightly
conical and the water wheel portion (consisting of the buckets d) cylindrical, the
trommel being in that case mounted on a horizontal axis, as shown. The object, in
either case, is in order that the material retained by the sieve, which is entirely waste,
may pass off freely and be discharged as "tailings." The launder. A foeds at the
upper or smaller end of the trommel D and against the descending side of the rotary
sieve. The buckets & surrounding the sieve, receive the water and material passing
through the meshes of the sieve which is driven by the weight of the water, etc. in
the buckets which are of the form shewn. The buckets d discharge into a hopper or
launder beneath, which conveys their contents to the buddle E. The sieve d' d' is of two
qualities or degrees of fineness, the first or upper portion d' being preferably wire cloth
(mesh 40 to 70 to the inch) and the lower portion d being silk gauze.
The buddle E, is composed of a surface of wire gauze e of a flattened conical form
stretched upon a sort of horizontal water wheel or turbine having blades e¹ so arranged
as to be driven by the water passing through the gauze e and falling against the
blades e¹ which are inclined from the vertical and extend radially upon a conical
bottom e². The conical sieve is surrounded by a plain flange of sheet metal e forming
a continuation of the conical surface and overhanging a circular trough e' which sur-
rounds the turbine and which receives the waste thrown off by the sieve, whilst the
water and material falling through the sieve upon the blades e¹ is discharged at the
circumference into the pit F. The launder which serves this buddle, directs
the stream tangentially on to the gauze surface of the buddle, so as to assist in
driving it.
The pit F is of the usual circular form, and the separation of the heavier portions
of the mineral is effected therein in the usual manner, and may be classified into
heads, middles, and tails, for subsequent treatment in the ordinary way.
The water and slimes from the pit F flow over removable stoppers f in the side of

page_text: the pit into a launder which terminates in a spout g that dips down into a filter tank G
nearly to the bottom thereof. Across this tank is extended a horizontal partition gl
of wire cloth or gauze (mesh 90 to 100 to the inch) situated at about mid-height of
the tank, through which the spout g passes, so as to discharge beneath it. The water
and some slime rises through the gauze partition and flows off at the top as waste, the
mineral being kept from rising by the gauze which prevents eddies or currents of
water and so promotes the settlement of the mineral in the tank.
The cylindrical sieve H, on to which the deposited mineral and slime is run from
tank G, is made of wire or silk gauze h (100 to 120 to the inch) stretched upon a
drum constituted by buckets h¹, the bottoms of which are inclined opposite ways from
the middle of the length of the cylinder, and the blades of which are both tangential
and oblique to the axis, so as to discharge at the ends of the apparatus. The launder
leads tangentially on to the top of this sieve which is mounted to revolve on a
horizontal axis, and is driven like an overshot water wheel.
Either of the sieves B, D, and H, may be used to separate the sand in the washing
of China Clay.
Having now particularly described and ascertained the nature of the said Invention,
and in what manner the same is to be performed, I declare that what I claim is ;
1. The combined series of operations constituting the herein described process of
dressing or separating ores, said operation being performed in apparatus operating
substantially as herein specified.
2. The combination, in the launder leading from the stamps, of the aperture in the
bottom thereof and of the covering plate or partition above said aperture for dividing
the stream and facilitating the separation of the "roughs," as specified.
3. The improved jigger herein described, consisting of a trough working on a
horizontal pivot at one end, and having a (normally) horizontal sieve in the bottom
near the other end, the bottom of the trough being enclosed from the sieve down-
wards towards the pivoted end, and being below the water level in the tank at that
end, in combination with means to raise and lower the free end of the trough in the
water, substantially as, and for the purpose specified.
4. The self-acting rotary sieve or trommel herein described, consisting of an
internal cylinder or conical sieve surrounded by an external series of buckets, sub-
stantially as, and for the purpose specified.
5. The self-acting rotary buddle herein described, consisting of a flattened conical
sieve stretched upon a sort of turbine and surrounded by a flange overhanging a
circular trough, the buddle being mounted in a pit and operating substantially as, and
for the purpose specified.
6. A filter and settling tank divided horizontally by a gauze division and having
the supply inlet below said division and the outlet above it, as described.
7. The self acting rotary sieve, consisting of an external cylindrical surface of
gauze stretched around buckets, constructed as shewn and described, so as to discharge
at the ends of the sieve, substantially as specified.
Dated thin 7th daSA: 1007