Abstract
Tests were carried out on a 150 mm heavy medium cyclone test rig treating coal in the size range - 13 +0.5 mm. A total of twenty seven experiments were carried out by varying the parameters like vortex finder diameter, spigot diameter and inlet feed pressure. The effect of these variables on the performance of the 150 mm Heavy Medium Cyclone was investigated. The results indicate that it is possible to achieve about 30.1% clean coal at an ash content of 18.5% at a feed pressure of 10 lb/in2, vortex diameter of 63.75 mm and spigot diameter of 31.5 mm. The tromp curves obtained from operating the cyclone gave a probable error of 0.04, indicating good separation efficiency.
Highlights
The quantum of imports may go up significantly in the near future as steel production in a large number of new projects is likely to be through the BF-BOF route and to meet the requirement of existing steel plants
The cleaning of the Indian coals requires crushing to a reasonable size for liberation of ash forming minerals and suitable technology adopted for washing this size fraction is processing them through Heavy Medium Cyclone
Twenty seven experiments were carried out to study the effects of Vortex Finder Diameter (VFD), Spigot diameter (SPD) and Feed Pressure (P) on the quality and quantity of the cyclone products (5)
Summary
The Indian Coking coal constitute about 14% of the total reserves and the domestic availability for steel industry is limited and the Indian Steel industry has to depend heavily on imported coking coal to meet its needs. Domestic steel makers meet 80% of their coking coal requirement through imports. The cleaning of the Indian coals requires crushing to a reasonable size for liberation of ash forming minerals and suitable technology adopted for washing this size fraction is processing them through Heavy Medium Cyclone.
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