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In this post we're going to see the processes and equipment used in the extraction of molybdenum.
Besides, this article also includes:
crushing and screening equipment
Conventional flotation process
Nitrogen flotation process
Pulsating high magnetic separation process
Let's dive right in!
Single molybdenum and copper-molybdenum ore are the two most common molybdenum minerals in the mineral processing plant.
The main useful mineral in single molybdenum ore is molybdenite, which can be extracted directly by the flotation process after crushing and grinding. And the main useful minerals in the copper-molybdenum ore are chalcopyrite,pyrocopper, molybdenum, which can be extracted by bulk flotation process.
1. Crushing and Screening
Single molybdenum ore has low grade, fine particle size and complex composition. The typical crushing and screening process is coarse crushing, self-grinding, screening and fine grinding. The raw single molybdenum ore is crushed to the appropriate grinding feed size.
Because single molybdenum ore and copper-molybdenum ore have low hardness, they are easy to become sliming in the grinding process, which can be treated with stage grinding-stage the flotation process. The typical grinding process is one stage grinding, classifying,roughing, two-stage grinding, stage, classifying, one cleaning, three-stage grinding, classification, two cleaning, four stage grinding, classifying, 3~5 times cleaning, thickening and dewatering.
Copper and molybdenum grade in copper-molybdenum ore is not high. If adopting differential flotation process for the extraction of molybdenum, the processing capacity of slurry is larger and the production cost is much higher. Therefore, copper-molybdenum ore beneficiation process basically adopts coarse grinding, classifying, and bulk flotation process to get copper-molybdenum bulk concentrate, fine grinding,classifying, reagent removal, copper-molybdenum separation, thickening and filtering process. The involved copper-molybdenum separation has always been the technical difficulty for copper-molybdenum ore beneficiation process. At present, the developed copper-molybdenum separation technologies used in the extraction of molybdenum include conventional flotation process, nitrogen flotation process, pulsating high magnetic separation process and passivation process.
Adopt molybdenum float by copper depression process for the extraction of molybdenum.The key part of this process is to realize the copper inhibition. Currently,the effective inhibitors include inorganic substances (such as sodium sulfide,cyanide, etc.), organism (ethanethiol) and sodium silicate.
Adding a certain amount of nitrogen to the slurry, which make those inhibitors (such assodium sulfide, sodium bisulfide, etc.) with less pollution replace the poisonous inhibitors (cyanide).
Since chalcopyrite is weak magnetic mineral, molybdenite is on-magnetic mineral. Therefore, pulsating high magnetic separation process can be used to the extraction of molybdenum.
In bulk concentrate,the copper ore surface is oxidized by adjusting slurry temperature and PH value, so that the extraction of molybdenum can be achieved by hydrophily orhydrophobicity of copper minerals.
In conclusion, flotation process is the common process used in the extraction of molybdenum, and the equipment used in the extraction of molybdenum mainly includes crusher, vibrating screen, ball mill, spiral classifier, flotation cell, thickener, filter, etc.
We should choose suitable processes and equipment according to our own plant.