Papers by Keyword: Molybdenite

Abstract: Molybdenite and talc were selected as research object in paper and crystal structure, interaction between H₂O molecule and minerals surfaces, surface wettability, flotation behavior were studied by density functional theory method and flotation experiments. The results showed that molybdenite and talc were layered minerals which exhibited similar surface wettability. H₂O molecule had hardly effect with molybdenite or talc and H₂O molecule prefers to stay with water rather than the minerals surfaces. The reason why talc interferes with the flotation molybdenite has been revealed. The flotation results showed that good floatability of talc was the key factor causing a low grade of concentrate in alkaline solution. Thus, it is the key factor to enlarge floatability difference between molybdenite and talc.

Abstract: The flotation process of molybdenum ore from Liaoning in China with a new collector DMC is investigated. The results show that the collector DMC has stronger collecting power and better selectivity for molybdenite. Compared with traditional kerosene and xanthate flotation,this process using the new collector could have a good index with 60% sodium silicate. The closed-circuit test results are as follows:the molybdenum concentrate of 53.04% with the molybdenum recovery of 95.02% is obtained.

Abstract: A Mo middling has been obtained through Cu-Mo bulk flotation. In order to further enrich molybdenite and separate pyrite form this middling. A series flotation tests were conducted to concentrate Mo. Important parameters including regrinding fineness, CaO dosage and cleaning flotation stages were optimized to enhance Mo enrichment. In addition, a close-circuit flotation test was conducted under optimum parameters and a Mo concentrate with 22.92% of Mo grade and 93.75% of Mo recovery was obtained, which satisfied the plant requirement.

Abstract: Improving the recovery of molybdenum is a research hotspot in the bulk flotation of Mo-copper sulphide ore. In this paper, the optimum flotation parameters for a kind of molybdenite ore obtained form Yunnan province, involving the grinding fineness, pulp concentration, dosages of kerosene and butyl xanthate, were determined in order to improve the recovery of Mo in the bulk Mo-copper flotation. In addition, a close-circuit flotation test was also conducted to simulate the practical process. A Mo-copper concentrate with Mo grade of 3.02% and recovery of 93.46% was obtained through the close-circuit flotation test, which satisfy the requirement for the bulk flotation of Mo-copper ore.

Abstract: The grade of molybdenum in one processed tailing from a molybdenum plant is 0.0063%.The assay of mineral composition shows that the molybdenum metal mainly exists in the form of molybdenite. Employing the flow-sheet with one rougher and one scavenger, in which kerosene is used as collector, we can obtain the rough concentrate, of which the yield is 0.65%, and its grade is 0.73% with a recovery of 77.04%. Then, the rough molybdenum concentrate was milled and floated again, and its yield of final flotation concentrate is 0.01534%, with the grade of 24.87% and a recovery of 61.39%.

Abstract: The research has conducted a experimental research on the issues in modifier of flotation process in a molybdenum ore concentrating mill in Inner Mongolia. The results show that: when the raw ore is grinded into 61% -200 meshes, which is the same to the site production ore, the sorting index is optimum in neutral magma condition; and for dispersing agent, the sorting effect of sodium silicate is better than sodium hexametaphosphate, and the confirmed sufficient quality of sodium silicate is 300g/t.

Abstract: As certain refractory molybdenum with degree high oxidation and high argillization, on the premise of molybdenum concntrate recovery rate, in order to increase tenor of molybdenum concntrate, we use cyclonic static micro-bubble flotation column as concentration equipment. We used two concentrate courses to replace flotation machine eight concentrate courses. It showed that, in the condition of same recovery rate, tenor of molybdenum concntrate was 26.16%, rising by 8%. Using processes of flotation machine eight concentrate courses - concentrate regrinding - flotation column two concentrate courses, tenor of molybdenum concntrate was 39.33% and the recovery rate was of 8%. The results showed that, by increasing the degree of monomer dissociation of molybdenum ores, cyclonic static micro-bubble flotation column has higher capability in recovering and selecting ores of -400 mm size fraction. The high argillization resulting from the regrinding and unsuppressed gangue minerals are the main factors affecting the tenor of ore concentrate.

Abstract: In this paper, potential control flotation of molybdenite has been investigated which focus on the effect of pulp potential on flotation performance. Optimum flotation conditions of molybdenite are determined through tests: optimum pulp potential is 190mv~300mv, dosage of sodium sulfide is 6kg/t.The potential control flotation does not use sodium silicate which solved the problem of tailing settlement difficulties. The mechanism of potential control flotation shows that S0 is the main factor that achieves potential control flotation of molybdenite.

Abstract: My perceptions of the biohydrometallurgical field span four decades and stem from being a professional microbiologist conducting academic research and research for process development and applications. My experiences have given me an appreciation for knowledge gained through fundamental research and the transfer of this knowledge to development of commercial scale applications of microbial processes. The symposia series for international activities in biohydrometallurgy has been a major factor in advancing knowledge and applications for microbial bioleach systems. The first international biohydrometallurgy meeting was held in Braunschweig, Germany in 1977. This was the predecessor for the International Biohydrometallurgy Symposia. As evident from the Symposia, advances in development and applications of biohydrometallurgy technologies follow an evolutionary, rather than revolutionary progression from demonstration of knowledge at the laboratory scale to engineering commercial plants.