Burning Mad: The Controversy Over Treatment o
2012-1-10 · A type of BIF, cement kilns are large, inclined, rotating cylindrical industrial furnaces. They may be 10-15 feet in diameter and 400-760 feet long. In a cement kiln, raw materials — limestone, clay, sand, iron ore — are fed in at the upper, cooler end. Fuel — coal, oil, and/or hazardous waste — is fed into the lower, hot end.
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