Effects of process mineralogical characteristics of moraine on flotation pulp of copper-molybdenum ore
The natural caving mining method in the Pulang copper mine of Diqing,Yunnan,causes a large amount of moraine to enter the ore,resulting in ore dilution and advanced slime,greatly affecting the subsequent sorting operation. This study focused on the process mineralogy of Pulang Copper Mine to identify the mineral composition,distribution characteristics,and particle size characteristics of the ore. Based on this,rheological measurements and single mineral flotation tests were conducted to analyze the influences of moraines and other slime on the pulp environment and to improve pulp adjustment during the flotation process. The results show that the inhibition effect of sodium silicate on moraine is due to its selective adsorption at the moraine-water interface. When chlorite,potassium feldspathite and hornblende are present in the flotation pulp,the flotation separation efficiency of molybdenite is higher. The non-polar sulfide ore collector(MCO) and sodium silicate have little influences on the apparent viscosities of chalcopyrite and molybdenite pulp,but greatly impact the viscosity of moraine pulp. The apparent viscosity of moraine increases with the increase in MCO concentration,while it decreases significantly with the increase of sodium silicate dosage,indicating that sodium silicate weakens the interaction between moraine particles. The hydrophobic association between the particles of the moraine induced by sodium silicate coverage is slightly reduced. The strong van der Waals forces between the particles of the moraine are the main reason for the formation of complex microstructure. The external energy input partially destroys the aggregation of fine moraine particles. The pulp viscosity further increases with the increase of grinding fineness because the large amount of Ca2+produced after the dissolution of the moraine makes the pulp viscosity increase.
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