Alexander Mining PLC Patent Granted in Canada (7872A)
March 28 2017 - 9:45AM
UK Regulatory
TIDMAXM
RNS Number : 7872A
Alexander Mining PLC
28 March 2017
28 March 2017
Alexander Mining plc
("Alexander" or the "Company")
Patent Granted in Canada for a Method for Leaching Zinc from a
Zinc Ore
The Company is pleased to report that it has received
notification that its MetaLeach Limited ("MetaLeach") subsidiary
has been granted a patent in Canada for a Method for Leaching Zinc
from a Zinc Ore. The patent, number 2,756,433, has a standard term
of 20 years from the effective date of 19 February 2010 (being the
date of original filing of the PCT Application from which the
Canada patent is derived).
Description
The patent, the Australia and USA equivalent of which was
granted on 30 August 2012 and 3 February 2015 respectively,
describes a method for leaching zinc from zinc-bearing carbonate
ore. The method comprising the steps of: subjecting the
zinc-bearing carbonate ore to elevated temperatures of between
about 300 degC and about 900 degC in the absence of additional
reactive reagents, thereby producing a roasted ore; subjecting the
roasted ore to an aqueous acid or alkali leach thereby producing an
aqueous zinc solution; and subjecting the aqueous zinc solution to
a zinc recovery step.
Background
Sulphide deposits have dominated production of primary zinc.
Current estimates are that approximately 95% of the zinc mined
worldwide is mined from sulphidic ore deposits, in which the ore is
typically mixed with sulphides of copper, lead and/or iron. After
grinding the ore, froth flotation is used to separate minerals from
the gangue, taking advantage of differences in their
hydrophobicity. The concentrate is either smelted or undergoes
roasting (to produce zinc oxide and sulphur dioxide), acid leaching
(typically using at least some of the sulphur dioxide to produce
acid) then electro-winning to recover zinc.
Unlike sulphides, zinc oxide is not readily separated from
gangue materials by gravimetric means. Accordingly, the zinc oxide
component of a mixed zinc oxide-zinc sulphide ore is typically
discarded. However, increasing zinc demand has resulted in
increased interest in recovering zinc from non-sulphide zinc ores,
such as oxides and carbonate ores.
This patent complements those in the AmmLeach(R) family by
expanding the range of ores which can be treated. Where zinc is
present in combination with other metals the pre-treatment
separates the zinc rendering it leachable. The patent is primarily
intended for and complementary to use in combination with
AmmLeach(R).
This announcement is inside information for the purposes of
Article 7 of EU Regulation 596/2014.
ENDS
For further information, please contact:
Martin Rosser
Chief Executive
Mobile: +44 (0) 7770 865
341
Matt Sutcliffe
Executive Chairman
Mobile: +44 (0) 7887 930
758
Alexander Mining plc
Tel: +44 (0) 20 7078 9566
Email: mail@alexandermining.com
Website: www.alexandermining.com
Northland Capital Partners
Limited
Matthew Johnson / Gerry
Beaney
+44 (0) 20 3861 6625
(Corporate Finance)
John Howes
(Corporate Broking)
Turner Pope Investments
(TPI) Ltd
James Pope / Ben Turner
+44 (0) 20 3621 4120
This information is provided by RNS
The company news service from the London Stock Exchange
END
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