flotation gangue molybdenite

  1. Gangue Depressant in Molybdenum Flotation. The rejection of sulfide impurities from the molybdenite concentrate is dependent on the conditioning time of Nokes reagent. In the absence of depressants, the rejection of sulfide impurities, with the exception of pyrite, is independent of the pH in the flotation circuit.

  2. Froth flotation is an important step in many mineral processing operations. Often, unwant-ed hydrophobic gangue materials such as talc, graphite, serpentine, chlorite, anhydrite and carbonaceous gangue are also recovered in the concentrate. Low levels of Depramin can be used to reduce the amount of gangue in the

  3. However, a higher concentration of Ca 2+ could depress molybdenite flotation even in the absence of fine gangue minerals. This depression was more pronounced on fine molybdenite particles. In this study, the deleterious effects of Ca 2+ on molybdenite flotation resulted from the interaction between Ca 2+ and molybdenite edges.

  4. METHOD AND APPARATUS FOR SEPARATION OF MOLYBDENITE FROM PYRITE CONTAINING COPPER-MOLYBDENUM ORES . FIELD OF THE INVENTION . The present invention relates to a method for the separation of the mineral components of pyrite containing copper-molybdenum ores by flotation.

  5. The kinetics of flotation of molybdenite during rougher flotation stage is illustrated in Figure 4. About 80% of Mo values were recovered in the float in the initial 2.5 minutes of flotation time. Increasing the froth collection time beyond 2.5 minutes resulted in dilution of the float assay due to collection of slimy gangue.

  6. Today column flotation has become . an accepted means of froth flotation for a fairly broad range of applications, in particular the cleaning of sulfides (copper, zinc, lead and molybdenite) and the flotation of iron ore, phosphate and coal. Flotation columns differ dramatically from mechanical flotation machines in . several ways:

  7. Molybdenite Mineral Deposits in Nigeria, West Africa with Information on their locations and uses. ... (molybdenum) separated from gangue minerals (copper) by the use of flotation process (froth floatation) and a wide variety of reagents, which oxidizes to form soluble molybdate. ...

  8. All of the experimental results suggest that humic acids can be employed as a selective depressant for molybdenite during the flotation separation of molybdenite and talc under alkaline conditions ...

  9. A study of mechanisms affecting molybdenite recovery in a bulk copper/molybdenum flotation circuit. International Journal of Mineral Processing, 2009. William Skinner. Massimiliano Zanin. Stephen Grano. I. Ametov. Liqun ZHOU. William Skinner. Massimiliano Zanin. Stephen Grano. I. Ametov.

  10. The quality of recycled process water is an important issue in the flotation of Cu–Mo ores. Processing of Cu–Mo ores includes two steps: a bulk flotation where molybdenite is recovered together with Cu sulfides, and a subsequent selective flotation

  11. Several sequential stages of flotation also are used for the copper ore, first to separate the gangue, and then the copper. The molybdenite concentration is usually 70 to 90 percent purity, when recovered from copper ores.6 Technical grade molybdic oxide, consisting of 90 to 95 percent MoO3, is produced by roasting molybdenite

  12.  · This volume also included two reviews on molybdenite flotation (Castro, 1979, Shirley, 1979). We feel that considerable advances in understanding of the surface properties and floatability of molybdenite have recently been made and this calls for a new review. 2. Crystalline structure and natural floatability of molybdenite

  13. 1 Froth Flotation – Fundamental Principles Froth flotation is a highly versatile method for physically separating particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in a mineral/water slurry. The particles with attached air bubbles are then carried to the surface and

  14.  · In the recovery of molybdenite by froth flotation, it is common practice to start with mill concentrates or copper concentrates as they are more often called. These are partially refined sulfide ores from which much of the gangue material has been removed by froth flotation.

  15. 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 ...

  16. Molybdenite can occur as the sole mineralization in an ore body, but is usually associated with the sulphide minerals of other metals, mainly copper. Molybdenum mines are classified into three groups according to the minerals contained in the ore body and their quality: •Primary mines, where the extraction of molybdenite is the sole aim.

  17. True flotation of non-sulphide gangue (NSG) only occurs due to attachment to molybdenite; the very low Mo grade of the ore results in very low NSG R max values. As a comparison, copper porphyry ore may exhibit NSG R max of 4 to 8%. The molybdenite recovery was generally poor under the standard size conditions with P 80 of 210 microns and "m ...

  18. Abstract: Flotation separation of chalcopyrite from molybdenite was studied using seaweed glue (SEG) as a depressant. Flotation process and mechanism were examined by response surface methodology, flotation tests, adsorption tests, zeta potential measurements and …

  19. The invention discloses a flotation separation method for molybdenite and galena, which comprises the following steps of: 1, rough grinding; 2, rough selection and scavenging for obtaining lead-containing molybdenum rough concentrate; 3, regrinding after a certain amount of active carbon is added into the lead-containing molybdenum rough concentrate; and 4, multiple selection: selecting the ...

  20. 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. Get …

  21. Molybdenite, MoS 2, a 2-D transition metal dichalcogenide, is a potential substitute for graphene.Molybdenite mineral particles are separated from gangue minerals by flotation, a process often performed in saline waters, where the presence of …

  22. The following wastes may be generated by extraction and beneficiation operations: gangue, flotation tailings, spent flotation reagents, and wastewater. 16,17 The tailings from molybdenite concentration are not expected to exhibit any hazardous characteristics, but metal leaching and acid formation are …

  23.  · Molybdenite flotation in the bulk copper/molybdenum flotation circuit at Kennecott Utah Copper was studied by means of a combination of plant metallurgical surveys, laboratory flotation tests, mineralogical analysis (QEM-Scan), surface analysis (ToF-SIMS) and contact angle measurements.

  24. Froth flotation is a process for separating minerals from gangue by taking advantage of differences in their hydrophobicity. Hydrophobicity differences between valuable minerals and waste gangue are increased through the use of surfactants and wetting agents. Live Chat

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  26. The milled ore/gangue powder is mixed with a liquid and aerated in the flotation step. The less dense ore rises in the froth to be collected, while the gangue sinks to be discarded. Flotation separates the metallic minerals from the gangue this way and in the case of copper/ molybdenum ores separates molybdenite from copper sulphide.

  27. I am a late entrant to this discussion. As per SME Mineral Processing Handbook there are 12-14 minerals of Moly but the main is molybdenite. Molybdenite is naturally floating and there should not be any problem in recovery. In copper moly bulk floatation circuit more …

  28. 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 ...

  29.  · During the reverse flotation of rutile and hematite, dextrin used as a depressant interacted with minerals through chemical interaction. 4 In 1974, Wie and Fuerstenau researched about the effect of dextrin on molybdenite and proposed that the adsorption of dextrin on a molybdenite surface might be hydrogen-bond interaction for the first time. 5 ...

  30. Interactions with gangue minerals Flotation schemes for the separation of molybdenite from ores are based on the inherent natural flotation of molybdenite. Chander and Fuerstenau (1972) undertook a detailed investigation to elucidate the factors that affect the surface properties of MoS 2 which in turn govern the natural flotation of molybdenite.