Steve
There is a document which discusses lime manufacture,
the detail are:
Her Majesty's Inspectorate of Pollution. Lime manufacture and
associated processes. Chief
Inspector's Guidance to Inspectors. Process Guidance Note IPR 3/2. London, HMSO, 1992.
I would have thought the main risk would have been the high
alkalinity from the lime products produced. Lime was produced by
burning crushed, high purity limestone/chalk (96-98% calcium carbonate) in
kilns at between 800°C and 1500°C. These high temperatures
liberated carbon dioxide gas and produced calcium oxide. The lime
produced was cooled, stored and used as the burnt lime (quick lime), or mixed
with water and used as the hydrated lime (slaked
lime).
As with any high temperature burning processes it is
likely that there would be some ash or slag material probably elevated
concentrations of heavy metals (cadmium, chromium,
copper, lead, mercury,
nickel, zinc) and high molecular
weight Polycyclic Aromatic Hydrocarbon such as Benzo(a)Pyrene. There may
also be waste refractory bricks for lining the Kiln, these can contain
Hexavalent chromium. Probably some old plant, but this would not be such a
problem.
Its possible that the high alkalinity of the lime
wastes will reduced the leachability of of heavy metals present.
Best Regards
Russell
Dr Russell Thomas
CBIOL, MIBIOL, MIEnvSc,
CEnv.
Senior
Professional Associate
Research
and Innovation Team,
PB, Environment
Group,
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I'm looking at a former quarry
which has apparently backfilled between 1898 and 1921 with waste from lime stone
quarry and lime kilning and was wondering if anyone had any thoughts on the
likely issues with lime kiln waste and any references or background reading
regarding lime kilning?
Steve
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