Flotation is the most effective method to separate galena and sphalerite ( Bandini et al., 2001). It uses the difference in the surface hydrophobicity of minerals to …

It is observed that in the absence of collector and Fe 3+ metal ions at pH 10, the maximum cumulative flotation of galena was 59% w/w. The presence of only 5 mg/L of Fe 3+ depresses flotation, having a cumulative flotation percentage of 54% w/w. Increasing the Fe 3+ concentration to 25 mg/L further depresses the collectorless …

Abstract. Galena is the most important lead-containing mineral that has semiconductor properties which can cause electrochemical reactions during flotation. This paper reviews studies of galena ...

Galena is floated by xanthates with a hydrocarbon chain length containing 2 or 4 carbon atoms. The use of short-chain collectors is explained by the natural hydrophobicity of galena. However, flotation of galena by carboxylic acids requires long-chain homologues with a hydrocarbon fragment length of (sim) 12 carbon atoms. …

The coordination properties of surface metal ions determine its flotation behaviours and interactions with reagents. In hematite, iron(III) is high-spin and has no π electron pair in d orbitals, unable to form π-backbonding with xanthate. ... Electrochemical characteristics and collectorless flotation behavior of galena: With and without the ...

The tails from the galena flotation are then used to float sphalerite away from pyrite primarily using copper activation. ... which poses a significant challenge in the separation of copper and lead. The adsorption mechanism of copper ions on the galena surface and its impact on the adsorption of the collectors (i.e., sodium ...

The collectorless flotation of galena in the presence of copper aqueous (+2) at pH 9.9 is depressed when the concentration is 50 and 75 mg /L, achieving a % w/w of cumulative flotation of 45% and 55%, respectively, FTIR analysis of floated galena in the presence of these copper concentrations shows intense absorption bands of free sulfate …

The study of the depression effect of non-toxic depressants on the flotation separation of chalcopyrite from galena is of great importance for both industrial applications and theoretical research. The mixed …

Abstract. Chemistry of sulphide mineral flotation by xanthates has been reviewed and discussed with respect to hydrophibization by collector coating and depressing effects of hydroxyl, cyanide and sulphide ions. The collection mechanism in Galena-Oxygen-Xanthate Flotation System has been elucidated electro-chemically by the use of electrode ...

Environmentally achieving the flotation separation of chalcopyrite and galena is always a difficult problem due to the similar floatability of the two minerals. To conquer the problem, maleic acid–acrylic acid copolymer (MA/AA), an eco-friendly reagent, was applied as a potential depressant for flotation separation of chalcopyrite from …

The adsorption of some flotation reagents on galena is affected by the chemical composition of the process water used. This study evaluated the effects of water quality on the adsorption of the collector xanthate and the depressant dextrin. For this purpose, the effect on the adsorption of ions typically present in process water of a …

In this study, selective adsorption mechanism of zinc ions on the surfaces of galena and sphalerite in the flotation separation of Pb-Zn was comprehensively explored by flotation tests, Zeta potential measurements, Fourier transform interferometric radiometer (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) analysis, and …

The flotation tailing obtained from the galena flotation of Canada's sulfide deposit has a high content of fine-grained sphalerite and pyrite. 80 % of both sphalerite and pyrite particles are less than 0.074 mm in size. ... which changed the hydrophobicity of pyrite. In the flotation experiments, the S 2 O 4 2– ion was used as an inhibitor ...

The results indicated that the dissolution of lead ions from galena surface was strongly enhanced in the presence of pyrite, significantly depending on the pyrite content. ... Induced adsorption of pectin on copper-ion-modified galena surfaces: Flotation and adsorption mechanism. Minerals Engineering, Volume 173, 2021, Article 107229.

The results of the flotation tests reveal that the cooperation of ferric ions and hydrogen peroxide can strongly and selectively depress galena. The CA and FT-IR analyses demonstrate the significant decrease of hydrophobicity and collector adsorption of the galena surface by the synergistic effect of ferric ions and hydrogen peroxide.

Galena is the most important lead-containing mineral that has semiconductor properties which can cause electrochemical reactions during flotation. This paper …

Galena dissolution and determination of the concentration of "unavoidable" lead ions in the solution causing disturbed selectivity of flotation extraction of the required mineral was studied in [].When grinding galena, a significant amount of lead ions (sim 8.25cdot 10^{-6}) mol/l enters the solution. The experiment was carried out in an inert …

Selective recovery of chalcopyrite–galena ore by flotation remains a challenging issue. The development of highly efficient, low-cost, and environmentally friendly depressants for this flotation is necessary because most of available reagents (e.g., K2Cr2O4) are expensive and adversely affect the environment. In this study, ferric …

The free lead ions in flotation solution may exist in five forms, including Pb 2+, Conclusion. In this work, adsorption and flotation tests were performed to investigate the suitability of PAAS as a galena depressant in a Cu-Pb separation system and the effect of pre-oxidation on it. ... The accelerated oxidation of galena is conducive to the ...

1. Introduction. Galena (PbS) and sphalerite (ZnS) are abundant in the earth and usually exist together in the same deposit. 1−3 Most lead–zinc ores are processed by differential flotation, in which galena is recovered first followed by sphalerite. 4,5 The addition/presence of lead ions (Pb 2+) in ore pulp can directly promote the sphalerite …

It is well known that many metal ions like as Cu 2+, Pb 2+, Mg 2+, Fe 3+, Ca 2+, and Al 3+ occurred in the flotation pulp, which are mainly derived from the use of …

In single mineral flotation, CLS only adsorbed on the surface of galena covered with Pb(OH) +. When galena and chalcopyrite are in the flotation system together, under specific pH conditions, the lead ions dissolved from galena in pulp can also adsorb on the sulphur-rich surface of chalcopyrite in the form of Pb(OH) +. In this case, the active ...

Galena Chalcopyrite Surface oxidation FTIR Analysis XPS Analysis Xanthate decomposition 1. Introduction Short circuit recycling of flotation process waters entails …

The flotation tests of single and mixed minerals confirm that CSD7 can achieve an efficient separation of molybdenite from chalcopyrite, galena and pyrite in a collector-free flotation system. Under the concentration of CSD7 with 5 × 10 −4 mol/L and pulp pH of 7, the grades of molybdenite concentrate are higher than 50%, and the ...

Separation selectivity, FTIR and XPS a lead ion on the surface of galena, which was conducive to the selective flotation separation. The contact angle results …

The depression mechanism was revealed by ion complexing tests and contact angle tests, which provided a basis for the flotation separation of sphalerite from galena. 2 Experimental 2.1 Materials The naturally pure minerals of galena and sphalerite were all purchased from Guangxi, China.

A combination depressant SHI was composed of sodium sulfite (Na 2 SO 3) and sulfonated lignin (SL) in a 5:1 M ratio.In this study, SHI and sodium silicate (Na 2 SiO 3) were employed to inhibit the floatability of galena, and the synergies between agents was explored.Micro-flotation results shown that after 2.4 × 10 −4 mol/L SHI was added, the …

SEG depressed galena by covering xanthate ions in the functional groups of -COO and mainly underwent weak physisorption on chalcopyrite. These mechanisms account for the ability of SEG to depress galena effectively while enabling chalcopyrite flotation. ... T. Kudō, I. Machida, and S. Ishiwata, Macromolecular ion flotation of Fe …

Furthermore, for galena the effect of sulphate ions on flotation is concentration dependent; its recovery increases at low sulphate ion (as sodium salt) concentrations then decreases at higher ...

Micro-flotation tests indicate that the addition of chloride ions prior to sulfidization can significantly increase the flotation recovery of cerussite, which is attributed to the formation of more lead sulfide species on the mineral surface. ... J. Ralston, The chemistry of galena flotation: principles and practice, Miner. Eng., 7(1994), No. 5 ...