UV light irradiation improves the aggregation and settling performance of metal sulfide particles in strongly acidic wastewater

Peng, Xianjia; Xia, Zhilin; Kong, Lingqian; Hu, Xingyun; Wang, Xianliang

doi:10.1016/j.watres.2019.114860

Cited by 22 publications

(8 citation statements)

References 30 publications

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“…In fact, recent studies focused on the increase of particle size of aggregates formed from metal sulfides precipitates have supported their results with laser diffraction measurements (Mastersizer) [33,34]. Results shown in Figure 7 demonstrate that the differences between a non-invasive technique as optical microscopy and Mastersizer could conduct to a confused interpretation.…”

Section: Statistical Analysis Of the Particle Size Distribution For Csupporting

confidence: 53%

Determination of Size Distribution of Precipitation Aggregates Using Non-Invasive Microscopy and Semiautomated Image Processing and Analysis

et al. 2019

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Particle size distribution (PSD) determination is a typical practice for the characterization of the slurries generated in a precipitation plant. Furthermore, the precipitates generated in these processes form colloidal or aggregated suspensions. Nevertheless, the conventional methods used to estimate PSD (e.g., laser diffraction and/or a cyclosizer) have not been designed to measure particles that tend to aggregate or disaggregate, since they include external forces (e.g., centrifugal, agitation, pumping and sonication). These forces affect the true size of the aggregates formed in a unit operation, thereby losing representativeness in terms of aggregates particle size. This study presents an alternative method of measuring the size distribution of particles with aggregation behavior, particularly, by using non-invasive microscopy and image processing and analysis. The samples used were obtained from an experimental precipitation process by applying sulfidization to treat the cyanide-copper complexes contained in a cyanidation solution. This method has been validated with statistical tools and compared with a conventional analysis based on laser diffraction (Mastersizer). The PSD results obtained with optical microscopy show a bi-modal behavior of the precipitates. However this behavior could be not determined when using the laser diffraction technique. The PSD obtained for the sample tested by microscopy had a mean of 119.7 μm, a median of 147 μm and a 90% distribution reached a particle size of 312.5 μm. These values differ with those obtained by the laser diffraction technique. Our results show significant differences between the methods analyzed, demonstrating that the image processing and analysis obtained by optical microscopy is an excellent and non-invasive alternative to obtain size distributions of aggregates in precipitation processes.

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Section: Statistical Analysis Of the Particle Size Distribution For Csupporting

confidence: 53%

Determination of Size Distribution of Precipitation Aggregates Using Non-Invasive Microscopy and Semiautomated Image Processing and Analysis

et al. 2019

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“…Finally, the third case showed that the particle size of CdS and a mix of CuS/CdS increased from 1-5 µm to 1000 µm after 30 min of applying UV light irradiation. Moreover, the zeta potential increased between 120% and 150% for both types of sulfide precipitates [99]. Thus, the results of these studies are interesting to improve the settling rate of a gravitational clarification stage, although the industrial scaling-up and implementation could be challenging, particularly in the case of magnetic field or UV light irradiation applications.…”

Section: Latest Breakthroughs In Solid-liquid Separationmentioning

confidence: 96%

“…Studies to optimize the solid-liquid separation in metal sulfide precipitation processes are still emerging, although there are a few interesting examples which could address new research trends. The use of a magnetic field to modify the zeta potential of particles [97], the use of an abiological granular sludge [98], and the use of UV light irradiation to improve the aggregation [99] have been experiments conducted to enhance the settling rate of particles. In the first case, the application of a magnetic field of 2T for 40 min increased the zeta potential from −40 mV to 16.5 mV.…”

Section: Latest Breakthroughs In Solid-liquid Separationmentioning

confidence: 99%

Metal Sulfide Precipitation: Recent Breakthroughs and Future Outlooks

2021

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The interest in metal sulfide precipitation has recently increased given its capacity to efficiently recover several metals and metalloids from different aqueous sources, including wastewaters and hydrometallurgical solutions. This article reviews recent studies about metal sulfide precipitation, considering that the most relevant review article on the topic was published in 2010. Thus, our review emphasizes and focuses on the overall process and its main unit operations. This study follows the flow diagram definition, discussing the recent progress in the application of this process on different aqueous matrices to recover/remove diverse metals/metalloids from them, in addition to kinetic reaction and reactor types, different sulfide sources, precipitate behavior, improvements in solid–liquid separation, and future perspectives. The features included in this review are: operational conditions in terms of pH and Eh to perform a selective recovery of different metals contained in an aqueous source, the aggregation/colloidal behavior of precipitates, new materials for controlling sulfide release, and novel solid–liquid separation processes based on membrane filtration. It is therefore relevant that the direct production of nanoparticles (Nps) from this method could potentially become a future research approach with important implications on unit operations, which could possibly expand to several applications.

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“…The mining, smelting and chemical industries produce large amounts of acidic wastewater characterized by low pH and high concentration of heavy metals. [1][2][3][4] Various heavy metal ions are present in acidic wastewater, such as Cu(II), Cd(II), Zn(II), etc. [5][6][7] It is very important to remove these heavy metals and recycle them in order to achieve sustainable development.…”

Section: Introductionmentioning

confidence: 99%

Boosting the growth and aggregation of sulfide nanoparticlesviaregulating heterogeneous nucleation for enhanced sedimentation

Zhang

et al. 2023

Environ. Sci.: Nano

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UV light irradiation improves the aggregation and settling performance of metal sulfide particles in strongly acidic wastewater

Cited by 22 publications

References 30 publications

Determination of Size Distribution of Precipitation Aggregates Using Non-Invasive Microscopy and Semiautomated Image Processing and Analysis

Determination of Size Distribution of Precipitation Aggregates Using Non-Invasive Microscopy and Semiautomated Image Processing and Analysis

Metal Sulfide Precipitation: Recent Breakthroughs and Future Outlooks

Boosting the growth and aggregation of sulfide nanoparticlesviaregulating heterogeneous nucleation for enhanced sedimentation

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