| Molybdenum is an important rare metal resource. As one of the strategic resources in China, molybdenum plays an irreplaceable role in the national economy and industrial production. As for molybdenum resource reserves, China ranks the first in the world. Molybdenum sulfide ores are the dominant reserves and its processing technology alsotakes a lead in the world. Due to geological processes such as long-term weathering erosion, surface hydrophilicity of molybdenum oxide is strong and its natural floatability is poor. Although the average grade of molybdenum oxide ore deposit is low and less study has been conducted worldwide, the research on its utilization can’t be neglected. Therefore the rational development and utilization of the wulfenite ores have great significance to make up for the depletion of molybdenum resources and improve the utilization ratio of the resource.Due to molybdenum and lead are simultaneously existed in wulfenite, the comprehensive utilization of wulfenite resources becomes extremely important. Processing a low grade wulfenite ore associated in the rare earth ore deposits was studied in this paper. Through the modern testing measures like MLA, EDS and others, the mineralogy characteristics of ores were investigated. On the basis of the mineralogy, the dressing and metallurgy tests were conducted and floatability differences and separating performance under different reagent system and conditions were studied. This paper is aimed at developing the efficient collector and the economic and reasonable technology of wulfenite ore associated in the rare earth ore deposits so that the important technical reference and guidance for the reasonable utilization of wulfenite and molybdenum oxide resources can be provided.In the flotation tests, the influence of parameters including pH, kind and dosage of collector and regulator in high-slime pulp environment were studied. Finally the conditions were determined as follows:flotation in a weak-alkaline pulp of pH8.0-10.0,100g/t MP-6and1400g/t MP-7as depressants, and160g/t MPY as collector. By the process of one roughing, three scavenging and seven cleaning operations, a flotation concentrate assaying15.71%Mo at the recovery of86.12%was obtained. In alkaline leaching tests of molybdenum concentrate, the effects of leaching time, leaching reagent dosage, temperature and solid-liquid ratio were discussed and the sodium molybdate solution at the recovery of99.03%was obtained. Then magnetic separation process was conducted to recover lead and REO from the leaching residue, and a magnetic product assaying23.87%REO and a non-magnetic product contains54.59%Pb were obtained. In this case, the comprehensive utilization of resources can be realized.In pure mineral flotation tests, the influence of dosage of collector and pH on the wulfenite floatability was studied. Through the determination of ion concentration in the solution and the thermodynamics calculation of the dissolution process, solubility of wulfenite in different pH of solution was deduced. Finally, the adsorption characteristics of the reagent on mineral surfaces were explained by infrared spectrum analysis.In this paper, a extractive metallurgical technique,"molybdenum flotation in weak-alkaline pulp-alkaline leaching of molybdenum concentrate-magnetic separation to recover lead and REO from leaching residue" was proposed. From theoretical to practical aspects, a new efficient wulfenite selective collector MPY was studied and direct flotation of wulfenite in weak alkaline pulp was achieved, which impacts the conventional sulfide flotation of wulfenite. Above all, it is effectively verified that direct flotation for wulfenite is feasible, which provides important research significance and theoretical value on the reasonable utilization of wulfenite resources and industry development. |
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