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What Is Molybdenum Disulfide,2013 - II

Molybdenum disulfide can be used even in  moderately elevated temperatures in the presence of oxygen. Although the disulfide does slowly oxidize to the trioxide, the result is still non-abrasive, with an acceptable level of lubrication persisting. In addition, by increasing the molybdenum disulfide particle size, its susceptibility to degradation significantly decreases. Sometimes, as in the case of heavy load-bearing, molybdenum disulfide is the lubricant of choice.

Molybdenite ore must be obtained and processed to produce commercial grade molybdenum disulfide. Ore is first mined using either the open pit method or the block caving technique, whereby material is dug out from under the ore which then caves in under its own weight. Processing the ore includes its being milled, or ground; flotation follows and involves frothing with air, sometimes under the influence of additives for best results. Interestingly, the useful ore rises whereas the waste rock settles. If necessary, acid leaching is used to remove metallic contaminants.

At this point in processing, the purity may already surpass 92 percent. Patented methods may then be employed to yet further increase purity. The final processed molybdenum sulfide particles frequently run from a few microns down to submicron size. Typical online providers cite molybdenum disulfide purities ranging from 98 to 99 percent. Non-lubricant applications include catalysis in the petroleum industry for desulfurization and as a p-type semiconductor material for the electronics industry.
 

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