Study of Multiple Dispersion Modes on the Dispersion Effect of Molybdenite in the Copper-molybdenum Separation Process
The presence of molybdenite in the flotation pulp often leads to its agglomeration,thereby encapsulating copper sulfide mineral and diminishing the separation efficiency of copper-molybdenum sulfides.The effects of ultrasonic dispersion,mechanical agitation and addition of dispersant sodium hexametaphosphate on the dispersion behavior of molybdenite were in-vestigated by optical microscope and focused beam reflectometer;The dispersion mechanism was studied by infrared spectrosco-py,scanning electron microscope,Zeta potential combined with chemical technology of flotation solution.The results show that all the three methods have the effect of dispersing the agglomerates of molybdenite,and the best dispersing effect is achieved with the addition of dispersant sodium hexametaphosphate.The addition of 400 mg/L sodium hexametaphosphate(SHMP)can not only effectively reduce the size and number of molybdenite agglomerates,but also reduce the content of chalcopyrite in the molybdenite agglomerates,so that the copper grade in the molybdenum concentrate in the flotation of the artificially mixed ore can be reduced from 3.86%to 2.73%.The mechanism is that sodium hexametaphosphate adsorbs on the surface of molybden-ite and generates spatial site resistance repulsion,and the ionized anions increase the electrostatic repulsion between the parti-cles,resulting in molybdenite showing a better dispersion behavior.
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