On the use of Na&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;3&lt;/sub&gt; as a pyrite depressant in saline systems and the presence of kaolinite

Arancibia-Bravo, María P.; Lucay, Freddy A.; Sepúlveda, Felipe D.; Cisternas, Luís A.

doi:10.37190/ppmp/139511

Cited by 6 publications

(5 citation statements)

References 31 publications

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“…Three main observations from this figure are (i) the zeta potential of kaolinite decrease with increasing pH in both solutions, (ii) in the presence of KCl, the isoelectric point (IEP) takes place at pH close to 6, and (iii) no significant effect on zeta potential is observed at alkaline pH values (pH > 7). At the working pH (pH = 8) in both working solutions, the typical values (−30 mV) are consistent with earlier reports, values that were reproduced by Zheng et al, among others [48,51,52].…”

Section: Effect Of Low Saline Concentration Electrolyte Over Ef Processsupporting

confidence: 92%

“…This is due to the nature of this type of ion, considered a breaker of water structures (breaker ion) [45]. On the other hand, the Na + ion promotes the hydrated layer on the kaolinite due to its tendency to generate aggregates with each other, probably negative, which promotes its tendency to stabilize in suspension in the medium [48].…”

Section: Zeta Potential Of Kaolinitementioning

confidence: 99%

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Ultrafine Kaolinite Removal in Recycled Water from the Overflow of Thickener Using Electroflotation: A Novel Application of Saline Water Splitting in Mineral Processing

et al. 2023

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The presence of ultrafine clay particles that are difficult to remove by conventional filtration creates many operational problems in mining processing systems. In this work, the removal of clay suspensions has been investigated using an electroflotation (EF) process with titanium electrodes. The results show that EF is a viable and novel alternative for removing ultrafine particles of kaolinite-type clay present in sedimentation tank overflows with low salt concentrations (<0.1 mol/L) in copper mining facilities based on the saline water splitting concept. Maximum suspended solid removal values of 91.4 and 83.2% in NaCl and KCl solutions, respectively, were obtained under the experimental conditions of the constant applied potential of 20 V/SHE, salinity concentration of 0.1 mol/L, and electroflotation time of 10 and 20 min in NaCl and KCl solutions, respectively. Furthermore, the visual evidence of particle aggregation by flocculation during the experiments indicates a synergy between EF and electrocoagulation (EC) that enhances the removal of ultrafine particles of kaolinite.

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Section: Effect Of Low Saline Concentration Electrolyte Over Ef Processsupporting

confidence: 92%

Section: Zeta Potential Of Kaolinitementioning

confidence: 99%

Ultrafine Kaolinite Removal in Recycled Water from the Overflow of Thickener Using Electroflotation: A Novel Application of Saline Water Splitting in Mineral Processing

et al. 2023

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“…The adjustments for copper recovery for Case 1 and Case 2 were 0.48 and 0.50, respectively (R 2 ). These results should not be surprising; in a previous study by the authors [89], similar results were obtained for the recovery of pure chalcopyrite in the presence of kaolinite and an aqueous solution of NaCl and KCl. In this case, it was not possible to represent copper recovery with a quadratic polynomial.…”

Section: Stage 2: Design and Experimentationsupporting

confidence: 84%

“…In this case, it was not possible to represent copper recovery with a quadratic polynomial. However, in a study with pure pyrite [89], it was possible to use a quadratic polynomial to adjust the recovery. In our case, for the real ore, the Fe recovery with the traditional method was not acceptable, with R 2 values of 0.54 and 0.79 for Case 1 and Case 2, respectively.…”

Section: Stage 2: Design and Experimentationmentioning

confidence: 99%

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Response Surface Methodology for Copper Flotation Optimization in Saline Systems

et al. 2022

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Response surface methodology (RSM) is one of the most effective tools for optimizing processes, and it has been used in conjunction with the Analysis of Variance (ANOVA) test to establish the effect of input factors on output factors. However, when this methodology is used in mineral flotation, its polynomial model usually performs poorly. An alternative is to use artificial neural networks (ANNs) in such situations. Within this context, the ANOVA test is not the best option for these model types; moreover, it requires statistical assumptions that are difficult to satisfy in flotation. This work proposes replacing the polynomial model of the RSM with ANNs and the Sobol methods to determine the influential input factors instead of the ANOVA test. This proposal is applied to two porphyry copper ores with a high content of pyrite, clay, and dilution media. In addition, this study shows how other computational intelligence techniques, such as swarm intelligence, can be incorporated into this type of problem to improve the learning process of ANNs. The results gave an adjustment of over 0.98 for R2 using ANNs, in comparison to values of around 0.5 when the polynomial model of RSM was utilized. On the other hand, the application of Global Sensitivity Analysis (GSA) identified the aeration rate and P80 size as the most influential variables in copper recovery under the conditions studied. Additionally, we identified significant interactions that affect the recovery of copper, with the interactions between the aeration rate, frother concentration, and P80 size being the most important.

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Impact of the use of seawater on acid mine drainage from mining wastes

Texeira

Calisaya-Azpilcueta

Cruz

et al. 2023

Journal of Cleaner Production

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On the use of Na<sub>2</sub>SO<sub>3</sub> as a pyrite depressant in saline systems and the presence of kaolinite

Cited by 6 publications

References 31 publications

Ultrafine Kaolinite Removal in Recycled Water from the Overflow of Thickener Using Electroflotation: A Novel Application of Saline Water Splitting in Mineral Processing

Ultrafine Kaolinite Removal in Recycled Water from the Overflow of Thickener Using Electroflotation: A Novel Application of Saline Water Splitting in Mineral Processing

Response Surface Methodology for Copper Flotation Optimization in Saline Systems

Impact of the use of seawater on acid mine drainage from mining wastes

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