

Author: Lindsay D. G.
Publisher: Maney Publishing
ISSN: 0008-4433
Source: Canadian Metallurgical Quarterly, Vol.16, Iss.1, 1977-01, pp. : 32-36
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Abstract
The molybdenum conversion facility at Endako processes in excess of 14 million pounds of molybdenum (Mo) per year. Current practice exploits procedures and experience developed since the commencement of operations during 1965. This paper describes the current roasting practice and facilities as well as several associated processes, i.e. concentrate leaching to remove calcium from the roaster feed, concentrate drying in a multi-hearth dryer, the packaging of calcine into metal containers, the production of briquettes, and the treatment of roaster off-gas to recover dust and remove sulphur oxides.The Endako operation consists of two Nichols roasters - a 16-foot-diameter, 10-hearth unit and an 18-footdiameter, 12-hearth unit. Operating time of these units is in excess of 97%. The major influences responsible for achieving this availability are improved rabble design, scheduled on-line plowing of hearths and an aggressive preventive maintenance program.Endako is a prime producer of technical-grade molybdenum trioxide, the product having very low concentrations of minor-element irnpurities.
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