Decrepitation of South African Manganese ores during the pre-heating process in a rotary kiln.
DOI:
https://doi.org/10.17159/Abstract
Manganese ores are the major source of manganese in the production of manganese ferroalloys. There is a gap in the knowledge of the decrepitation behavior of manganese ores, which presents a problem in the operations of smelters. Decrepitation, which is described as the breakage of the ore particles upon heating, is an important quality parameter for these ores. The purpose of this investigation was to determine the extent to which South African manganese ores will decrepitate during preheating in a rotary kiln. The effects that temperature, rotational speed, and particle size have on decrepitation were investigated. The investigation included heating manganese ores in a laboratory-scale rotary kiln. The temperature was controlled at 600, 800, and 1000°C, and the rotational speed at 3, 6 and 12 rpm, size range at were +6-20, +20-40, and +40-75mm with residence time constant at 30 minutes. Ore A, Ore B, and Ore C from the Kalahari manganese field were used. The Decrepitation Index (DI) is quantified as the ratio of the mass of <6 mm particles after pre-heating to the total mass of the sample. It was determined that the DI’s for all ores used were proportional to the temperature and the rotational speed and inversely proportional to the particle size range with temperature being the most important parameter. Ore A was the most susceptible to decrepitation followed by Ore C and Ore B, this was mainly to the decomposition of Kutnohorite which was the highest in Ore A and the lowest in Ore B.
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