Water quality effects on flotation: Impacts and control of residual xanthates

Muzinda, Ishamael; Schreithofer, Nóra

doi:10.1016/j.mineng.2018.03.032

Cited by 65 publications

(32 citation statements)

References 5 publications

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“…This characteristic is related to the locking of the clean water in the ice cap, covering the tailings pond and, consequently, the concentration of the contaminants in the water phase. The melting of snow then causes a sharp decrease in conductivity and dissolved species concentration around March-April [21]. As the concentration of all elements and compounds were increasing in winter-time due to the ice cap, the comparison with summer-time values was deemed more suitable.…”

Section: Comparison Between Laboratory and Plant Datamentioning

confidence: 99%

“…Additionally, not all variables have the same frequency of variation. Some operating condition-related parameters, such as pH, ORP, turbidity, residue reagents-related elements, can vary daily or even hourly when other parameters could have a longer frequency of variation [21]. This type of dynamicity could not be reproduced just by using synthetic plant water.…”

Section: Importance Applicability Limits and Uncertainty Of The DImentioning

confidence: 99%

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Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Schreithofer

Dahl

2020

Minerals

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To save freshwater resources and comply with environmental regulations, minerals processing operations are transitioning to partially or fully closed water circulation. However, the accumulation of electrolytes and the addition of reagents lead to changes in water composition and may compromise flotation performance and plant maintenance. As a consequence, costly modifications are often required to cope with these challenges. Therefore, knowledge about water quality variation owing to closed water circulation and its potential effect on the flotation performance is crucial. The experimental methodology presented in this paper targeted three main objectives: (1) predicting the tendency of the accumulation of elements and compounds into the process water during comminution, flotation, and storage in tailings facilities; (2) establishing a relationship between laboratory results and plant historical water quality data; and (3) predicting the potential effect of recycling water on flotation performance. The results obtained with Boliden Kevitsa ore showed a good correlation between the water matrix of the actual process water on-site and that obtained in the ore dissolution tests done in the laboratory. The final water composition came close to the process water in terms of major elements and some of the minor elements. Additionally, the work presented in this paper demonstrated that a dissolution loop allowed us to predict the potential impact of the recycling water on the ore flotability. This methodology could serve as an aid for predicting water quality matrix variation and designing closed water circulation systems at existing and new plants.

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Section: Comparison Between Laboratory and Plant Datamentioning

confidence: 99%

Section: Importance Applicability Limits and Uncertainty Of The DImentioning

confidence: 99%

Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Schreithofer

Dahl

2020

Minerals

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“…However, industrial operations may cycle water well over 10 times and, were this trend to continue, it may be possible to further decrease the addition of fresh collector at some point. Indeed, it was recently reported that monitoring and controlling xanthate additions in an industrial process resulted in reduced need of fresh xanthate additions into the process [39].…”

Section: Evolution Of Water Qualitymentioning

confidence: 99%

Environmental remediation of sulfidic tailings with froth flotation: Reducing the consumption of additional resources by optimization of conditioning parameters and water recycling

Nuorivaara

Björkqvist

Bachér

et al. 2019

Journal of Environmental Management

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The removal of sulfidic species in tailings using froth flotation is a promising approach to prevent phenomena such as acid mine drainage. However, flotation requires the consumption of reagents and water that represent additional expenses. Despite the strong interest of scientists and industry alike on tailings remediation, there is no study on the minimization of resource consumption to promote the implementation of desulfurization with froth flotation. Following a systematic analysis based on Design of Experiments (DoE), this work aims to determine the implications of a decrease in the consumption of flotation reagents and fresh water. It was found that: i) recovery of sulfidic species is strongly influenced by collector concentration and the use of a preliminary re-dispersion step; ii) higher frother concentrations have a negative impact on sulfur grade in the concentrate; and iii) the interactions between the conditioning variables hereby explored have no significant impact on flotation performance. Composition analysis showed that flotation further aids in the removal of hazardous species, such as As, Co and Zn. Finally, the use of recycled water appears possible since flotation performance remained unchanged over 10 flotation cycles, despite the observed accumulation of metallic ions and organic species in the process water.

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“…Collectors are added to the pulp to induce the hydrophobicity of the valuable minerals. Part of the trident factors of flotation operating parameters, adapted from Klimpel [11], demonstrate that flotation chemistry also has a substantial effect on flotation performance; this was supported by Ikumapayi et al [12] and Muzinda and Schreithofer [13], who demonstrated that certain ions have potentially adverse effects on flotation performance. More recently, Dzingai et al [8] investigated the effect of cationic spiking on the flotation performance of a low-grade Cu-Ni-PGM (Platinum Group Mineral) bearing ore and showed that certain cation concentrations may have affected valuable mineral recoveries marginally, although a marked difference was observed in the grade of the recovered concentrates.…”

Section: Introductionmentioning

confidence: 99%

Probing the Effect of Water Recycling on Flotation through Anion Spiking Using a Low-Grade Cu–Ni–PGM Ore: The Effect of NO3−, SO42− and S2O32−

Dzingai¹,

Manono²,

Corin³

2021

Minerals

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Water scarcity necessitates the recycling of process water within mineral processing practices. This may however come with its disadvantages for unit operations such as froth flotation as this process is water intensive and sensitive to water chemistry. It is therefore important to monitor the water chemistry of the recycle stream of process water and any other water source to flotation. Monitoring the concentrations of the anions in recycled process water is therefore important to consider as these are speculated to impact flotation performance. Batch flotation tests were conducted using synthetically prepared plant water (3 SPW) with a TDS of 3069 mg/L as the baseline experiment. 3 SPW contained 528 mg/LNO3− and 720 mg/L SO42−, other anions and cations, and no S2O32−.Upon spiking 3 SPW with selected anions, viz, NO3−, SO42− and S2O32−, it was noted that NO3− and SO42− exhibited threshold concentrations while S2O32− did not show a threshold concentration for both copper and nickel grade. Spiking 3 SPW with 352 mg/L more of NO3− to a total 880 mg/L NO3− concentration resulted in the highest copper and nickel grade compared to 3 SPW while increasing the S2O32− from 60 to 78 mg/L increased nickel and copper grade. 720 to 1200 mg/L SO42− and 528 to 880 mg/L NO3− were deemed the concentration boundaries within which lies the threshold concentration above which flotation performance declines with respect to metal grades, while for S2O32− the threshold concentration lies outside the range considered for this study. Anion distribution between the pulp and the froth did not seem to impact the recovery of copper or nickel. Notably, the correlation between the concentrate grades and anion distribution between the froth and the pulp seemed to be ion dependent.

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Water quality effects on flotation: Impacts and control of residual xanthates

Cited by 65 publications

References 5 publications

Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Dissolution Test Protocol for Estimating Water Quality Changes in Minerals Processing Plants Operating With Closed Water Circulation

Environmental remediation of sulfidic tailings with froth flotation: Reducing the consumption of additional resources by optimization of conditioning parameters and water recycling

Probing the Effect of Water Recycling on Flotation through Anion Spiking Using a Low-Grade Cu–Ni–PGM Ore: The Effect of NO3−, SO42− and S2O32−

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