Arsenic Removal from Mine Tailings for Recycling via Flotation

Choi, Jin-Young; Park, Kyuhyeong; Hong, Jeongsik; Park, Jayhyun; Kim, Hyung-Seok

doi:10.2320/matertrans.m2013285

Cited by 18 publications

(12 citation statements)

References 41 publications

(16 reference statements)

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“…During this process, a collector is used to impart hydrophobicity to desired mineral particles; these hydrophobic particles are then better attached onto the surface of a bubble, leaving undesired particles in the bulk solution. Among these collectors is xanthate, which is a typical collector used for sulfide minerals and for oxide minerals after the sulfidization process [7][8][9][10]. Although this collector has been exploited extensively over the last several decades, a reduction in its use is desired because it is environmentally harmful [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Kim

Choi

et al. 2018

Minerals

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Along with the accompanying theory article, we experimentally investigate the effect of the depletion attraction force on the flotation of malachite. While varying the concentration of the depletion agent (polyethylene glycol), three different systems are studied: pure malachite, pure silica and a 1:1 mass ratio of malachite and silica binary system. We find that the recovery increases significantly as the concentration of the depletion reagents increases for all three systems. However, the recovery suddenly decreases in a certain concentration range, which corresponds to the onset of the decreased surface tension when high concentrations of the depletion agent are used. The decreased surface tension of the air/water interface suggests that the recovery rate is lowered due to the adsorption of the depletion agent to the bubble surface, acting as a polymer brush. We also perform experiments in the presence of a small amount of a collector, sodium oleate. An extremely small amount of the collector (10−10–10−5 M) leads to the increase in the overall recovery, which eventually reaches nearly 100 percent. Nevertheless, the grade worsens as the depletant provides the force to silica particles as well as target malachite particles.

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Section: Introductionmentioning

confidence: 99%

Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Kim

Choi

et al. 2018

Minerals

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“…1,2) In particular, the sul de minerals (e.g., chalcopyrite, galena, and sphalerite) associated with the subject metal possess similar surface properties (e.g., electrokinetic and hydrophobic properties). [3][4][5][6][7][8][9] Fullston and the colleagues reported that the electrokinetic property of intact sulde minerals such as pyrite, sphalerite, chalcopyrite, and galena is similar with that of elemental sulfur, and thus they have similar isoelectric points lower than 3. 3,4) Depending on the magnitude of polarity (i.e., the strength of bonding composed of minerals), minerals can be subdivided into ve categories; 5) sul de minerals have a weak covalent bonding that is relatively weaker than that of carbonate, sulfate, and oxide minerals, and the low surface polarity caused by the weak bonding structure renders the surface of sul des relatively hydrophobic.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11] However, due to the aforementioned reasons that sul de minerals possess similar surface properties, separating each other is not straightforward. In most studies, hence, the recovery and grade have been improved by introducing effective or novel depressants.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Surface Characteristics and Floatability in Representative Sulfide Minerals: Role of Surface Oxidation

et al. 2017

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This study investigates how changes in the surface properties of three representative sul de minerals (galena, sphalerite and chalcopyrite) affect their oatability in the presence of an oxidizing agent (H 2 O 2 ). Tests were conducted at four molar ratios of H 2 O 2 :mineral (0, 0.5, 1.0, and 2.0). To better capture the effect of surface oxidation, the tests were conducted at both acid and basic conditions (i.e., pH = 3 and 10). In all surface property and oatability evaluations, the pH and Eh were equilibrated. The surface properties were evaluated by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential measurements and contact angle analyses. The oatability was evaluated by a micro otation method. At the acidic initial pH, galena most sensitively reacted with H 2 O 2 , followed by chalcopyrite and sphalerite, whereas at pH 10, the reactivity differences were insigni cant. H 2 O 2 addition changed the sul de species (initially present on the mineral surface) to sulfate or hydroxyl species, and decreased the mineral oatability. To investigate the surface property that mainly reduced the mineral oatability in the presence of H 2 O 2 , we measured the zeta potentials and contact angles, which are closely associated with the electrostatic and hydrophobic forces, respectively. The oatability depended on the contact angle after the H 2 O 2 addition, implying that the oatability was mainly reduced through oxidation reactions, which increased the hydrophilicity of the mineral surface.

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“…20,21) Previous studies reported that dixanthogen has a range of E H that exists very stably. 9,26) Accordingly, to examine the correlation between floatability and E H in the present study, the floatability of arsenopyrite and pyrite was plotted with the E H function in Fig.…”

Section: Analysis Of Correlation Between the Change Of Pulp Potentialmentioning

confidence: 99%

“…Here, it should be noted that although the peak of quartz was observed for both minerals, the effect of minimal amount of silica on the present study is negligible due to the unfavorable interaction between quartz and xanthate as supported by many previous studies. 20,21) To perform the flotation experiment, arsenopyrite and pyrite were crushed under 8 mesh (2.36 mm, Tyler Standard) using a jaw and cone crusher, and a single disc mill was used to grind it to have a particle size distribution of ¹105 + 150 mesh (106150 µm, Tyler Standard). To prevent mineral surface oxidation, the sample was preserved at freezing status.…”

Section: Materials and Reagentsmentioning

confidence: 99%

Flotation Behavior of Arsenopyrite and Pyrite, and Their Selective Separation

2015

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This study investigated the effect of pH and pulp potential (E H ) on the floatability of arsenopyrite and pyrite, which are single minerals, in Hallimond tube, by using xanthate as a collector. On this basis, the study further investigated the selectivity index of arsenopyrite and pyrite, using a mixed sample of arsenopyrite and pyrite. To examine the flotation behavior of each mineral by pH change, flotation was carried out at pH 4 and pH 10. The test results showed arsenopyrite had higher floatability at pH 4, regardless of the potassium ethyl xanthate (PEX) concentration. This is because xanthate ion was oxidized to be stable dixanthogen, which was well adsorbed onto arsenopyrite surface, due to the high E H of pulp. Meanwhile, arsenopyrite had relatively lower floatability at pH 10 than at pH 4, which was because the dixanthogen remained unstable, and was not adsorbed onto the arsenopyrite surface, due to the relatively low E H of pulp. Pyrite had low floatability at both pH 4 and pH 10. Just as for arsenopyrite, the result for pH 10 was caused by the low E H of pulp. Yet, interestingly enough, different from the case of arsenopyrite, pyrite at pH 4 had low floatability, despite its high E H . FTIR analysis was performed, to examine the reason for such contradictory behavior. The analysis result showed that this was caused by poor adsorption with xanthate, due to sulfate ion (SO 4 2¹ ) that was generated by the oxidation of pyrite surface in reaction with oxygen in pulp at pH 4. To further investigate the selectivity index (i.e., the pyrite recovery/ arsenopyrite recovery ratio) of arsenopyrite and pyrite, additional flotation tests were carried out on mixed sample of the two minerals. Different from the flotation behavior of single minerals, the results showed that the recovery of arsenopyrite was lower than that of pyrite, and the selectivity index of arsenopyrite and pyrite was the highest when the PEX concentration was the lowest. Such a different trend in flotation behavior of the mixed sample from the flotation behavior of the single minerals was because the surface oxidation reaction of arsenopyrite, which was more affected by E H among the mixed arsenopyrite and pyrite, generated ferric arsenate, a hydrophilic compound, on the surface of arsenopyrite, resulting in poor adsorption with xanthate; in turn, this depressed the floatability of arsenopyrite.

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Arsenic Removal from Mine Tailings for Recycling via Flotation

Cited by 18 publications

References 41 publications

Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Application of Depletion Attraction in Mineral Flotation: II. Effects of Depletant Concentration

Relationship between Surface Characteristics and Floatability in Representative Sulfide Minerals: Role of Surface Oxidation

Flotation Behavior of Arsenopyrite and Pyrite, and Their Selective Separation

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