MINERAL SEPARATION
from diamond, coal, zinc and platinum
operations.
The company’s custom-engineered products
are in some of the world’s largest mines and
many customers have standardised on their
screens to ensure lowest cost of ownership and
high performance, according to General Manager,
Sales and Service, Jan Schoepflin.
“While screening in heavy minerals is
Kwatani’s stronghold, the company has moved
extensively into coal, supplying the country’s
(South Africa’s) leading coal producer with no
fewer than 45 items of large screening
equipment, including out-sized 4.3-m-wide
units,” the company said.
Other recent coal-related orders include run-
of-mine screens for a medium-sized coal mine in
Mpumalanga, South Africa – again, competitor
equipment was replaced by custom-designed
screens with optimised deck angles, which
significantly increased tonnage, according to the
company.
Schoepflin said: “Our screens have been a
popular choice for modular gold plants going to
West Africa as well as Central and South America.
We also supplied to two of Africa’s largest copper
producers in Zambia, to a tanzanite producer in
Tanzania, and repeat orders to a manganese
mine in Ghana.”
Shaking it up
A row of Kwatani screens in operation in the iron
ore mining industry
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18 International Mining | MAY 2019
Holman Wilfley supplies gravity separation
technology to the minerals, metals and recycling
industries, but it is also fast becoming a clean
energy leader.
As part of its continuing environmental policy
development, the company recently completed
the installation of the first 20 kW array of solar
photovoltaic panels to power its main assembly
factory in Pool, England.
In addition to powering its own factory, the
installation will allow surplus natural energy to
feed back to the grid, contributing to government
targets for clean energy generation, Holman
Wilfley said.
“Our gravity machine assembly processes will
make use of this clean element of energy for
general operations, and testing,” the company
said. “This will help Holman Wilfley reduce its
carbon footprint and environmental impact.”
Its shaking tables provide gravity separation of
fine minerals in the mining space, with its
customers using the equipment to produce metal
concentrates. In these operations, the tables are
usually used as the final stage in gravity circuits.
The company’s gravity separation equipment
is also found throughout the mineral sands
space, where the tables are often the primary
concentrating technology.
David Goldburn, the company’s Business
Development Manager, recently told IM that the
company had, in total, over 20 Holman single
and double deck 8000 shaking tables about to
be commissioned or installed in two separate
tungsten operations in Spain.
This comes on top of several Holman 8000
single and double deck shaking tables recently
dispatched to Australia hard-rock lithium operations.
These machines, which tend to operate
between 1-2 t/h per deck, are driven by a Holman
head motion with stroke adjustment of between
8 mm and 16 mm (nominal). This head motion is
self-lubricating, requiring minimal maintenance,
and the deck is supported on 42 yellow polymer
carriers, with vibrations occurring diagonally
along the entire length.
Specific riffle patterns can be fitted on these
tables to maximise metallurgical performance (by
particle size/application data), according to the
company, while the deck tilt can be adjusted –
even during operation – using a hand wheel.