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Bureau of Mines / Minerals yearbook: Metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)

Reed, Avery H.
Lime,   pp. 727-734 PDF (671.6 KB)


Page 734

734 
MINERALS YEARBOOK, 1972 
TECHNOLOGY 
 Tarmac Roadstone Holdings, Ltd. of England, successfully converted a shaft-type
lime kiln to the use of liquid butane. 
 Air pollutants from a rotary lime kiln are dependent on the stone charged
and the fuel used. The gaseous effluent usually consists of water vapor,
carbon dioxide, and nitrogen, and may contain sulfur oxides. The particulate
emissions usually include flyash, lime dust, limestone dust and 
tars, and may include unburned coal. The quantity of dust from a lime kiln
may range up to 15% of the kiln feed. 
 New environmental regulations require the abatement of these air pollutants
or forced closure of the plant. Present applications use the wet scrubber,
fabric filter, or electric precipitator. Alternate methods, which will also
control the gaseous einis~ sions, are being studied. 


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