| Copper-molybdenum ores are important sources for current extraction of copper and molybdenum.Being one of the irreplaceable basic metal materials,molybdenum is widely used in the field of heating materials and structural materials for high temperature electric furnace.China is the world's second largest reserves of copper and molybdenum only after the United States.The resources of copper-molybdenum ores in China are often in the presence of porphyry copper deposits.Recovery of molybdenum becomes an important research aspect of mineral processors.Since flotation column was invented in 1961,much attention has been paid to its application.In the modern industry,flotation column has been widely used in beneficiation of ferrous,non-ferrous,and non-metallic ores.At the same time,since the flotation column itself has the advantages of simple structure and high efficiency,more and more mineral processors try to use flotation column to separate the Cu-Mo bulk concentrate.The process mineralogy research was performed to the bulk concentrate of copper-molybdenum obtained from the Jiama concentrator in Tibet,the copper-molybdenum bilk concentrate produced by the concentrator is subjected to separation tests using a flotation column,including the best copper-molybdenum flotation condition test,as well as the full process of the reagent system and the optimal flowsheet structural test,which provides a technical reference for the rational development and utilization for the copper and molybdenum ores.The bulk concentrate produced from the Jiama concentrator is characterized by high copper and low molybdenum contents.Copper is mainly in the form of chalcopyrite,and molybdenum is mainly in the form of molybdenite.At the same time,pyrite accounts for a large portion.Quartz is of the main non-metallic minerals.The run-of-mine assays 1.02% Cu and 0.054% Mo,the bulk concentrate assaying17.15% Cu and 0.49% Mo can be obtained by one roughing,one scavenging,and3-times cleaning..The study was carried out to explore the flotation conditions to separate the bulkconcentrate.The effects of grinding fineness,pulp concentration,reagents regime and flotation column parameters on the separation of copper and molybdenum were investigated.The optimum conditions for the roughing separation are showed as follows: Grinding fineness of 90%-74?m,20% pulp concentration,1800g/t sodium silicate,95g/t kerosene,12000g/t sodium sulfide and 1250g/t QJ;A molybdenum concentrate with 39.13% Mo at the recovery of 49.51% and a copper concentrate assays 17.25% Cu at the recovery of 99.45% can be obtained by using the closed circuit test of one-stage roughing,one-stage scavenging and six-stage cleanings.Study on parameters of roughing flotation by column was conducted and the final conditions are determined as follows: pressure of 32 Mpa,operational level of 70 and airflow volume of 0.6L/min.With reference to the site flotation process of one-stage roughing,two-stage scavenging,and three-stage cleaning used in Jiama Concentrator,a process of flotation column and flotation cells was proposed,and a qualified molybdenum concentrate was obtained with 1.52% Cu and 44.74% Mo at the recovery of 37.44%,17.69%Cu at the recovery of 80.52%.Although the grade of copper in the final molybdenum concentrate was slightly higher,a reliable and economical process for the separation of copper and molybdenum was carried out by this study.This solution keeps the process on site only make minor adjustments to existing processes in Jiama concentrator.Potentially resolves the risk of direct application of the flotation column in the beneficiation plant,which provides a reference to instruct the enterprise's production and technical renovation. |
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