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flotation process collectorless

  • Could homeopathy provide the key to collectorless flotation?

    Apr 01, 2012· The collectorless flotation of minerals has been one of the Holy Grails of flotation scientists. Although it has been achieved with a few highly hydrophobic materials such as diamond and anthracite, it has had little success with the vast majority of minerals, which have to be persuaded to float by the use of expensive and often toxic reagents.[...]

  • Electrokinetic properties of a galena and chalcopyrite ...

    Colloids and Surfaces, 40 (1989) 137-143 Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands Electrokinetic Properties of a Galena and Chalcopyrite with the Collectorless Flotation Behaviour S. KELEBEK* and G.W. SMITH Department of Mining and Metallurgical Engineering.[...]

  • (PDF) Surface modifications in the chalcopyrite-sulphite ...

    Surface modifications in the chalcopyrite-sulphite ion system. I. collectorless flotation, XPS and dissolution study. International Journal of Mineral Processing, 1997. William Skinner. Stephen Grano. John Ralston. Cantelli-forti G. William Skinner. Stephen Grano. …[...]

  • Collectorless Flotation of Oxidized Pyrite | Request PDF

    The bench-scale flotation tests of single mineral were carried out and showed that chalcopyrite lost its floatability in flotation process. Whereas for molybdenite, it maintained good floatability.[...]

  • Collectorless Froth Flotation of Ultramafic Nickel Ore ...

    May 02, 2010· Collectorless Froth Flotation of Ultramafic Nickel Ore - Pre-treatment with Acid ... The video shows froth zone loaded with sulphides in batch flotation of …[...]

  • Selectivity in the Collectorless Flotation of Two Complex ...

    Using different gas compositions and different conditioning times it was found that collectorless flotation occurs when Ep is +195 to +295 mv (vs SHE). The actual on-set potential for collectorless flotation is dependent on the ore. A too high potential or prolonged oxidation leads to a decrease in selectivity.[...]

  • Collectorless flotation - MIM Holdings Limited

    May 10, 2005· The collectorless flotation of chalcopyrite requires that the flotation occurs in a neutral or slightly oxidising environment. Previous studies have shown that freshly fractured flotation of chalcopyrite increased when the redox potential (Eh) was in the neutral or slightly oxidising region. ... The flotation process also requires that the ...[...]

  • Collectorless flotation of Chalcocite by controlling redox ...

    Using microflotation method, this study explored the collectorless flotation of Chalcocite and its dependence on the redox potential of pulp . Electrochemical studies were performed by cyclic voltammetry in specific potential ranges and at different pH values. The results show that significant floatability of Chalcocite occurs in the specific reducing conditions.[...]

  • Surface studies of the collectorless flotation of chalcopyrite

    Since this reagent creates a strongly reducing environment, the collectorless-flotation process using Na2S appeared to support the view that fresh, unoxidized sulfide minerals are naturally hydrophobic (Ravitz and Porter, 1933; Fuerstenau and Sabacky, 1981).[...]

  • Collectorless flotation of marmatite with pine oil ...

    Jul 15, 2015· The flotation results show that marmatite exhibits considerable floatability with the addition of pine oil. SEM–EDS results show that carbon atomic ratios on the surface are significantly high, which suggests that the flotation of marmatite is caused by the adsorption of …[...]

  • Flotation in a sentence (esp. good sentence like quote ...

    The collectorless electrochemistry flotation of commensal sulphur minerals is realized by adding a small quantity of electrochemical regulators. 123. ... data related to auto-oxidation of fatty acid and deals with the flotation behaviour of reaction products formed in the process of auto-oxidation of unsaturated fatty acid.[...]

  • Chalcopyrite Flotation without Collector - Surface Chemistry

    Considering that collectorless flotation occurs only at oxidizing potentials, elemental sulfur may be the hydrophobic entity that is responsible for the flotation. It is, therefore, possible that polysulfides may play an important role in the collectorless flotation of sulfide minerals in alkaline solutions.[...]

  • (PDF) Collectorless flotation of lead and zinc sulphide ...

    A study on collectorless flotation of lead and zinc sulphide present in the Derekoy ore in the presence of sodium sulphide was performed. ... The results of experiments indicated that the ...[...]

  • Complex sulphide ore processing with pyrite flotation by ...

    Collectorless flotation does not contribute to the results observed with regard to pyrite flotation. It is of interest to mention that in a very recent study on the application of electrochemical concepts to sulphide flotation systems Johnson (1988) found that the grade of a galena concentrate is improved by a reverse flotation process where ...[...]

  • Flotation Archives — Page 16 of 33

    A single reagent flotation process, using fatty acids or amine as the collector, would eliminate the scrubbing step along with the other flotation step. Experimental. The following series of tests were conducted to generate flotation baseline data as per the current processing scheme employed in the plants. Rougher or fatty acid flotation[...]

  • The collectorless flotation of chalcopyrite ores using ...

    The collectorless flotation of chalcopyrite ores using sodium sulfide. Int. J. Miner. Process., 13: 271--283. The collectorless flotation process has been tested on six different chalcopyrite ores while monitoring the potentials (Eh) of the pulp. The results show that collectorless flotation is effective only under oxidizing conditions.[...]

  • (PDF) Preliminary study on collectorless flotation of ...

    Preliminary study on collectorless flotation of chalcocite, bornite and copper-bearing shale in the presence of selected frothers ... Flotation is a process of separating fine particles of ...[...]

  • chalcopyrite flotation process

    Collectorless flotation of chalcocite by controlling redox potential. Abstract. Using microflotation method, this study explored the collectorless flotation of Chalcocite and its dependence on the redox potential of pulp . ... Optimization of flotation process comprises the development of suitable flotation kinetic .... zinc, iron and sulfur ...[...]

  • Collectorless flotation of oxidized pyrite - ScienceDirect

    Jan 20, 2019· For example, a maximum flotation recovery of 50% was reached after 120 s at pH 3. According to the micro-flotation results, the collectorless flotation recoveries of oxidized pyrite after 5 min and 15 min of ultrasonic treatments were below 20% and similar at all pH values tested.[...]

  • US6889844B1 - Collectorless flotation - Google Patents

    The present invention relates to a process for improving the recovery of valuable sulphide minerals. The process involves determining an Eh range within which the valuable sulphide mineral may be recovered by flotation without the need of a collector. The slurry is then subjected to flotation in a pneumatic cell ( 50 ) at such a speed that the slurry remains within the Eh range during flotation.[...]

  • Flotation in Seawater | Request PDF

    Inhibition of bubble coalescence is of fundamental importance in a flotation process because it determines the size of bubbles and foam stability. ... The mechanism for collectorless flotation is ...[...]

  • chalcocite flotation

    Collectorless flotation of Chalcocite by controlling redox, Using microflotation method, this study explored the collectorless flotation of Chalcocite and its dependence on the redox potential of pulp Electrochemical studies were performed by cyclic voltammetry in specific potential ranges and at different pH valu The results show that significant floatability of Chalcocite occurs in the ...[...]

  • INFLUENCE OF FROTHER TYPE AND DOSE ON …

    Influence of frother type and dose on collectorless flotation of copper-bearing shale … 551 The results of flotation of investigated shale in the presence of frothers in the form of recovery of different particle size fractions and frother concentrations expressed in mg/dm3 versus flotation time are presented in Figs. 2a-d. It can be seen ...[...]

  • Collectorless Sulphide Flotation

    Evidence for the floatability of sulphide minerals without collector is analyzed and it is shown that results obtained with ores, in contrast to those with single minerals or mineral mixtures, depend on many additional variables, some identified and others not. Because of the prevailing low levels and costs of collectors for most sulphide ores, it is unlikely that collectorless flotation will ...[...]

  • Effect of cathodic polarization on the collectorless ...

    Microflotation tests were carried out to investigate the effect of cathodic polarization on the collectorless flotation of chalcopyrite. It was observed that collectorless flotation of a cathodically polarized chalcopyrite sample could he obtained when oxygen was used for aeration, but not if nitrogen was used.[...]

  • WO2000015346A1 - Collectorless flotation - Google Patents

    The present invention relates to a process for improving the recovery of valuable sulphide minerals. The process involves determining an Eh range within which the valuable sulphide mineral may be recovered by flotation without the need of a collector. The slurry is then subjected to flotation in a pneumatic cell (50) at such a speed that the slurry remains within the Eh range during flotation.[...]

  • SPECIFIC ION EFFECT OF CHLORIDE SALTS ON …

    Several flotation plants in the world use process water with high salt content. Meanwhile, the use of process and saline waters in coal flotation has also attracted great interest for many years as the process water can be re-used and the accumulated salt ions available in water can enhance coal flotation. Since the researchers (Majer et[...]

  • NICKEL AND COBALT ORES: FLOTATION

    Figure 1 Effect of pH on collectorless flotation recoveries on Enonkoski noritic ore after grinding in steel mill. (Reprinted from ... Problems due to process water The difRculty of ... III/NICKEL AND COBALT ORES: FLOTATION 3493.[...]

  • Collectorless Flotation of Sulphide Minerals: Mineral ...

    Apr 27, 2007· Collectorless flotation is reviewed from the viewpoint of classical oxidation studies through to modern electrochemical, surface chemical and spectroscopic investigations coupled with flotation studies. Sulphide minerals apparently oxidize through a continuum of metal deficient sulphides of decreasing metal content through to elemental sulphur.[...]

  • Research Activities Related to Flotation Process

    Research Activities Related to Flotation Process Abstract Flotation initially originated from the field of mineral processing. The importance of this process to the economy of the whole industrial world is considered to be enormous. Since for many years various particulate solids besides minerals have been extracted by using this effective gravity[...]