Fluidized Bed Pilot Furnace for Modibdenite Concentrate

Abstract

In the Rare Metals Processing Shop (CPRM) at the Almalyk MMC JSC, the technology for processing molybdenite concentrate (MOC) provides for the use of kaolin in the granulation charge for oxidative roasting in a drum furnace. Its composition: 8-10% kaolin, the rest is molybdenite concentrate (MOC). Kaolin reduces the Mo content in the cinder. Replacing it with an organic binder eliminates this disadvantage (dilution in Mo), but leads to sticking of the granules in the drum furnace. To avoid sticking, it is proposed to replace it with a furnace of a different design. In addition to kaolin as a binder for MOK, ashless, water-soluble polymers are known. Replacing kaolin with them leads to an enrichment in molybdenum of an industrial product - cinder, by 4-5%. However, for the implementation of such a project, a based selection of the appropriate binder on the local raw material base, modes of its use and replacement of the roasting furnace: drum - with a fluidized (fluidized) bed furnace is required. A binder SK, an alternative to kaolin, and modes of firing granules from a new charge composition with MOC in a fluidized bed furnace have been developed. The design of the fluidized bed furnace has been developed. The introduction of these developments will provide a higher content of Mo in the cinder, better recovery of Mo and Re from it, as well as a lower sulfur content in the cinder, and less time spent on roasting: 1 hour instead of 7 hours in the existing rotary kiln.