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Out
of 300 million tonnes of coal produced in India, washing capacity
exists for hardly 40 million tonnes, (including coking coal),
i.e. for only 13 per cent of the total coal production. In
other words, 87% of coal is not washed due to lack of beneficiation
(washing) capacity. Coal beneficiation is done by two broad
methods , namely (a) conventional wet washing and (b) dry
beneficiation. In the conventional wet washing route, there
are a number of technologies available, most of which are
well established in terms of technology. In the area of dry
beneficiation, there are few technologies, which are again
coal specific. However, these technologies are applicable
for soft coals as found in Europe, Australia, etc. and not
suitable for hard Indian coals.
Under
these circumstances RAMDARS - an acronym for RAdioMetric Detection
and Automatic Removal of Stones/Shale - emerged as the solution
with a versatile application for beneficiating all kinds of
coals particularly, power grade coals which are not subjected
to conventional washing techniques due to the prohibitive
cost implications. The system uses radiometric-cum-laser sensor
technology for identification of non-coal particles and pneumatic
ejection jets for removal of the same.
This
patented innovation was brought about by Ardee Business Services
Pvt. Ltd, Visakhapatnam and utilized by coal mines like SCCL,
WCL.
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