Improvements in and relating to Ore Pulverisers and Gold Savers and Mineral Concentrators.
Year: 1893

page_text: Date of Application, 16th May, 1893
Complete Specification Left, 13th Feb., 1894-Accepted, 17th Mar., 1894
PROVISIONAL SPECIFICATION.
Improvements in and relating to Ore Pulverisers and Gold Savers
and Mineral Concentrators.
I, BASIL JOHN ATTERBURY of 50 Saltoun Road Brixton S.W. Gentleman do
hereby declare the nature of this invention to be as follows:-
A machine for crushing or pulverising of quartz or other ores by means of one or
more cylindrical roller or rollers placed within one or more semicylindrical
chambers, one roller being placed in each chamber and where more than one
chamber or section is required the same to be placed adjoining lengthwise. The
chambers to be rocked from side to side by means of a beam lying and fastened
across the top of a chamber which beam is moved by suitable gearing driven by a
belt or other suitable means: also for the saving of gold and concentration of
minerals by means of ripples in each chamber following the roller.
Dated this 16th day of May 1893.
BASIL J. ATTERBURY.
COMPLETE SPECIFICATION.
Improvements in and relating to Ore Pulverisers and Gold Savers
and Mineral Concentrators.
I, BASIL JOHN ATTERBURY, of 50 Saltoun Road, Brixton, London, Gentleman,
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 a machine for pulverizing quartz or other ore, for
saving free gold, for the concentration of other minerals and metals, and for
pulverizing basic slag, tale and other similar materials at a less expense and more
effectively than can be done by the machines at present in use.
The machine consists of a rocking cradle divided into two or more chambers at
different heights in each of which there is or are one or more free rollers. The
material after passing under one roller is successively passed under the other rollers
of the series (the number of the chambers and rollers to each machine or plant
being determined by the character of the work to be done), while the saving of the
free gold or silver and concentration of minerals is effected by the interposition of
ripples between each roller and chamber.
As the operations of crushing ores, which are usually pulverised in a wet
condition, and grinding cement and similar materials, which must be absolutely dry,
are in some respects different, I will describe the manner in which my invention is
to be worked in each case. The chambers are lined with plates of steel or any
other suitable metal. When it is required to pulverize ores or other materials by
the wet process the material to be treated is fed into the machine at the upper end
into the hopper which is provided for the purpose; it falls under the first roller
which at the upper end may be provided with a bevelled edge and after being
crushed sufficiently fine is carried down by the water-introduced in a fan-shaped
jet under the roller-over the ripples at the lower end of the chamber. When ore
bearing free gold or silver is being passed through the machine, copper plates may
be inserted between the chambers and mercury being placed in the ripples the free

page_text: gold or silver is amalgamated. When minerals are being concentrated without
mercury, the copper plates may be dispensed with.
This operation may be carried on under an indefinite number of rollers according
to the degree of fineness required, though generally speaking and for all practical
purposes the degree of fineness to which the material may be crushed may be
regulated by the supply of water. Gratings may be placed after any or all of the
rollers and above the ripples so that no material can pass to another roller until it
has been crushed to a sufficiently fine degree. In the second, and when more than
two chambers are used, the subsequent chambers, the material is so fine that a large
quantity or proportion is held in suspension, and the splash requires to be confined.
To effect this a splash-board of wrought iron plate or other suitable material is
bolted along the top of the chambers. In order to remove the material as fast as
it is crushed, side splash chambers fitted with suitable gratings or screens are
provided at the sides of the chamber each having a drain to permit of the wash
getting away.
Another grating as before alluded to is also placed at the end of
the chamber. With a view to saving any amalgam that may be thrown out an
amalgamating table may be bolted on to the end of the last chamber. For dry
crushing and pulverization the whole of the machine is closed in and made
practically air tight. The ripples are dispensed with and a greater fall is given
from one chamber to the next. Under each roller is introduced a jet of air or the
material may be drawn through by exhaust. The fine dust is collected by means
of a collector and the bulk is passed through a shoot over any suitable screen and
the fine stuff bagged while the coarse may be carried by an elevator back to the
hopper to be reground.
Another method by which the material may be passed along and at the same time
be effectively ground is by making the floor of the chamber slightly inclined to
the mouth whereby the material will have a fall and the action of the roller working
up towards the top of the chamber in accordance with a well-known law, will keep
pushing the material down as it is ground.
In place of being made cylindrical as shown-the rollers and their beds may be
slightly conical.
In order to remove the necessity of employing stone breaking machinery when
only one or two machines are used the first roller may be corrugated by which
means it will be found that the machine can be fed with stone up to four or even
five inches cube and these lumps will be broken down and pulverized.
The rocking of the machine is effected by means of a bar or beam placed across
the top of one of the chambers and connected at the other end to suitable driving
gear.
Figure 1 is a longitudinal vertical central section of a three chamber machine
adapted for wet grinding,
Figures 2 and 3 are transverse sections of the same on the lines 2-2 and 3-3
Figure 1 respectively,
Figure 4 is a diagram view showing the method by which the cradle is
rocked.
a is the cradle preferably made in three castings bolted together as shewn. are
rockers on the underside of the cradle working on rails c. d are safety pins for
preventing longitudinal motion of the cradle, they pass through holes in the rails
and enter slots in the rockers. e are partition plates across the top of the cradle
cast in one piece with the sections and fare transverse stays secured by bolts f¹.
The upper section has two stays but the other sections have only one the second
being replaced by a projection e' at the bottom of the partition e. These stays and
projections serve to limit the longitudinal play of the rollers of which there is one
in each section the upper one only however being shown in the drawings. Each
roller is built up of a ring g of chilled iron or hard steel having inside three lugs g¹
which are received in slots formed in the two filling pieces the whole being
secured together by the bolts g³ and nuts g'. The latter are received in three of six
recesses in each filling piece g². These recesses enable the rollers to be taken

page_text: hold of to be lifted out. The portion of the cradle beneath each roller is lined
with a plate of steel whose upper edges are secured by bolts and nuts h¹.
Between the chambers or portions of the trough containing the rollers are inclined
corrugated surfaces or ripples j, formed inside the trough. When the apparatus is
to be used for metals capable of being amalgamated these 'ripples are lined with
amalgamating copper plates which are hammered into and fit the corrugations.
The upper ends of the plates are secured by bolts and nuts (not shown in the
drawings) in such manner that they can be readily unfastened and lifted out so as
to be replaced by fresh plates. The third and subsequent compartments (if there
be any) have openings at each side leading into chambers the openings being
covered by strainers m. The bottoms of the chambers are slightly inclined and
lead to passages n conducting the wash to the top of the ripples j. Above, the
Water is admitted to the
second and subsequent compartments are splashboards o.
upper end of the cradle a by the pipe p. The cradle is rocked by the beam q
connecting rod crank pin sand axle t the latter being driven in any convenient
way.
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 a trough, means for rocking the trough, compartments in
the trough, the bottom of each compartment being lower than that of the preceding
one and a roller or rollers in each compartment.
2. The combination of a trough, means for rocking the trough, compartments in
the trough, the bottom of each compartment being lower than that of the preceding
one, ripples or collecting surfaces between the compartments and a roller or rollers
in each compartment.
3. The combination of a trough, means for rocking the trough, compartments in
the trough, the bottom of each compartment being lower than that of the preceding
one, ripples or collecting surfaces between the compartments, chambers in the sides
of the compartments, strainers between the compartments and chambers, passages
leading from the chambers to above the ripples or collecting surfaces and a roller
or rollers in each compartment.
4. Apparatus substantially as described and shown in the drawings.
1
ST11002
BASIL J. ATTERBURY.