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Figure 14: Collectorless flotation of pyrite in the presence of Cu2+ ions (pH 9.2, flotation time 5 min). [15]. .. 28 Figure 15: Effect of atmosphere (grinding, flotation) on chalcopyrite floatability after grinding
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In flotation, pH control is a vital method to control selective mineral separation. A standard depressant that is used is an Alkali. An Alkali is any substance that when mixed with Acid will neutralize each other and form a new chemical substance called a BASE. This is very important. The ore may be either alkaline or Acidic. To have a positive control over flotation, it is necessary to be
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Bornite recoveries tended to be depressed with a smaller amount of NaHS as pH increased. The recoveries of chalcopyrite increased as pH increased at an optimum NaHS dosage. Moreover, the flotation kinetic model that includes the surface properties and the reaction rate constant between the copper sulfide minerals and NaHS was derived.
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sulphide minerals. Bornite (Cu 5 FeS 4) and covellite (CuS) and energite (Cu 3 AsS 4) are normally present in lesser quantities. The complete flotation of chalcocite is achieved between ph = 1 to ph = 10 with ethyl xanthate. The resulting hydrophobic species is CuX. 1. Hydroxyl as depressant (OH-)
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The impact of water quality on flotation performance pH, Eh, DO and dissolved species in recycle water streams (e.g. thickener overflow, decant (tailings) dam return) contributing to a circuit water are also shown in Table I. TDS and TOC levels may also be raised by reagent addition for pH control (e.g. lime) and recycled organics (e.g
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The eastern ore has traditionally always been more sensitive to pH and responds to flotation at higher pH 10.5 compared to 9.5 for the western ore. It is further evident that the impact on flotation, resulting from the failure of No. 2 thickener was not as severe as the earlier experience when No. 1 thickener failed.
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Another important parameter whic h has a remarkable effect on the flotation of sulphide minerals is pH. It is It is established that xanthates decompose in acidic environment and hence, resulting
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In flotation, pH control is a vital method to control selective mineral separation. A standard depressant that is used is an Alkali. An Alkali is any substance that when mixed with Acid will neutralize each other and form a new chemical substance called a BASE. This is very important. The ore may be either alkaline or Acidic. To have a positive control over flotation
More
sulphide minerals. Bornite (Cu 5 FeS 4) and covellite (CuS) and energite (Cu 3 AsS 4) are normally present in lesser quantities. The complete flotation of chalcocite is achieved between ph = 1 to ph = 10 with ethyl xanthate. The resulting hydrophobic species is CuX. 1. Hydroxyl as depressant (OH-)
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Effect of pH modifier on flotation of celestite 991 at 10 -2 M, giving rise to intense mineral depression. G~ilvez [4], found a similar effect of the depressant Na2SiO 3 when working in alkaline media on pure minerals. Likewise, at low depressant concentrations (10
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The flotation pH is, however, slightly different. East ore responds better at a higher pH of 10.5 while the west ore is best floated at a pH of 9.5 (Table I). The reason for this difference is not precisely known but this is likely attributable to the slight mineralogical variation in the host rock and the bornite to chalcopyrite ratios—these
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The impact of water quality on flotation performance pH, Eh, DO and dissolved species in recycle water streams (e.g. thickener overflow, decant (tailings) dam return) contributing to a circuit water are also shown in Table I. TDS and TOC levels may also be raised by reagent addition for pH control (e.g. lime) and recycled organics (e.g
More
Another important parameter whic h has a remarkable effect on the flotation of sulphide minerals is pH. It is It is established that xanthates decompose in acidic environment and hence, resulting
More
will produce compensating effects in other areas (Klimpel, 1995) Froth flotation is a good example of an engineering “system”, in that the various important parameters are highly inter-related, as shown in Figure 1. It is therefore important to take all of Chemistry Components Collectors Frothers Activators Depressants pH
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Water quality had no effect on the collectorless flotation of chalcopyrite which was very strong, in excess of 96% copper recovery, but all three lower quality waters had a detrimental effect on the recovery of bornite compared to that obtained in distilled water. The depressant effect was so strong that the little recovery achieved in these
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Effect of pH on Flotation Turkish J. Eng. Env. Sci. 26 (2002),309 318. ¨ ITAK ˙ c TUB Effect of pH on Pulp Potential and Sulphide Mineral Fl Views 5 Downloads 0 File size 303KB
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Control of pH is one of the most widely applied methods for the modulation of mineral flotation. In this study the effect of pH on potential in solution and sulphur minerals flotation is discussed with various electrodes. The electrodes were platinum, gold, chalcopyrite, pyrite and galena. In solution, potentials were linearly dependent on pH with a different slope for each electrode.
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In this paper, the effect of sodium butyl xanthate (NaBX) adsorption on the surface of bornite at different pH on flotation was studied by adsorption kinetic and thermodynamic. The flotation results demonstrated that the recovery was the highest when pH was 9 in NaBX solution (4×10−5 mol/L). The adsorption kinetics showed the reaction of NaBX on the bornite conformed to the second order
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Abstract—This study investigated the effect of pH on the recovery and grade of the Platinum Group Metals (PGMs) and base metal sulphides from the UG2 ore of the bushveld complex. This was achieved through running a series of test work in a Denver flotation cell at varying pH 6-11 at constant reagent dosage. The UG-2 reef is characterized by two
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Nov 19, 2013 The role of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions between chalcopyrite and pyrite and low alloy steel balls were investigated in the grinding of Sarcheshmeh porphyry copper sulfide ore. All these factors strongly affect the galvanic current between the minerals and the steel during the grinding process.
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Fundamental adsorption, micro-flotation and Eh-pH tests were conducted on pure Figure 2.8- pH effect on the activation of chrysocolla and subsequent recovery with sodium Comparison between collectorless bornite flotation and flotation with PAX,
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flotation experiments, including the addition in the flotation conditioning stage and 4 minutes lasting frothing. Fig. 3: The variation of the pulp potential as a function of time after addition of 16kg/t Na 2 S and aeriation. 3.1. Effects of solid percent and pH at low level of Na 2 S
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sulphide minerals. Bornite (Cu 5 FeS 4) and covellite (CuS) and energite (Cu 3 AsS 4) are normally present in lesser quantities. The complete flotation of chalcocite is achieved between ph = 1 to ph = 10 with ethyl xanthate. The resulting hydrophobic species is CuX. 1. Hydroxyl as depressant (OH-)
More
The impact of water quality on flotation performance pH, Eh, DO and dissolved species in recycle water streams (e.g. thickener overflow, decant (tailings) dam return) contributing to a circuit water are also shown in Table I. TDS and TOC levels may also be raised by reagent addition for pH control (e.g. lime) and recycled organics (e.g
More
Effect of pH modifier on flotation of celestite 991 at 10 -2 M, giving rise to intense mineral depression. G~ilvez [4], found a similar effect of the depressant Na2SiO 3 when working in alkaline media on pure minerals. Likewise, at low depressant concentrations (10
More
THE INFLUENCE OF pH AND OLEATE CONCENTRATION ON CHROMITE FLOTATION (after Palmer, M.C.Fuerstenau and Aplan, 1975) This chromite, FeO.Cr 2O 3, assayed 42% Cr(III), 8% Al 2O 3, 4% Fe(III), 7% Fe (II), and 8% Mg(II), with a PZC at about pH 7. Flotation response at high pH match the hydrolysis peaks of FeOH and MgOH, respectively.
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Effect of pH on surface characteristics and flotation of sulfidized cerussite 677 2003; Rashchi et al., 2005; Kuchar et al., 2006). Unfortunately, difficulties in controlling the dosage of sulfidizing agents are a common issue. An excessive amount may cause the depression of oxidized minerals, whereas an insufficient amount results
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will produce compensating effects in other areas (Klimpel, 1995) Froth flotation is a good example of an engineering “system”, in that the various important parameters are highly inter-related, as shown in Figure 1. It is therefore important to take all of Chemistry Components Collectors Frothers Activators Depressants pH
More
Control of pH is one of the most widely applied methods for the modulation of mineral flotation. In this study the effect of pH on potential in solution and sulphur minerals flotation is discussed with various electrodes. The electrodes were platinum, gold, chalcopyrite, pyrite and galena. In solution, potentials were linearly dependent on pH with a different slope for each electrode.
More
Nov 19, 2013 The role of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions between chalcopyrite and pyrite and low alloy steel balls were investigated in the grinding of Sarcheshmeh porphyry copper sulfide ore. All these factors strongly affect the galvanic current between the minerals and the steel during the grinding process.
More
Centenary Of Flotation Symposium, Richardson and walker showed that the flotation of chalcocite bornite chalcopyrite and pyrite with potassium ethyl xanthate is controlled by the conditioning potential similar to earlier findings by heyes and trahar the active surface entities for chalcoc Modifiers For Chalcocite Flotation
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The influence of metal ions on flotation varied with pH, Ca 2+, Mg 2+ and Sr 2+ exerted stronger depression at high pH than at low pH, for example, at pH = 6.5 the gaps between recoveries in the absence of metal ions and in the presence of Ca 2+, Mg 2+ and Sr 2+ were 8.39%, 18.92% and 12.15%, while at pH = 11, the gaps increased to 23.00%, 28
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Effects of froth properties on dewatering of flotation products Na Zhang, Xumeng Chen and Yongjun Peng (The University of Queensland, Australia) The critical degree of bornite surface oxidation in flotation T. Moimane, Y. Huai and Y. Peng (The University of Queensland, Australia)
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2.2 Effect of pH and Collector Concentration on Flotation To determine the effects of pulp pH on the flotation recovery of the pyrite mineral, representative subsamples were conditioned and floated at pH 4, 6.4, 8, 9.2 and 11. Conditioning of the pulp was carried out at the set pH
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also depressed at pH 11. 3.2 Effect of pH on flotation Maintaining PAX and MIBC concentrations at 100 g/t and 200 g/t, respectively, flotation behav-iour of Cu and Mo was investigated at varying slurry pH ranging from pH 3 to 11 and the results obtained are presented in Table 3 and Fig. 3. Pulp density was maintained at 20% and flotation was
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