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Minerals
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Comprehensive Utilization of Mineral Processing Wastewater
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Comprehensive Utilization of Mineral Processing Wastewater

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Processing and Extractive Metallurgy".

Deadline for manuscript submissions: closed (31 August 2024) | Viewed by 4271

Special Issue Editors

Prof. Dr. Shaojun Bai

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Guest Editor
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
Interests: flotation theory; efficient and clean utilization of metal mineral resources
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Qicheng Feng

E-Mail Website
Guest Editor
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
Interests: flotation theory; comprehensive utilization of resources
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Mineral processing plays an essential role in national economic development. Currently, highly efficient utilization of resources and environmental protection are fast becoming a priority in the mining engineering field. Mineral processing wastewater, as the inevitable product of mining and processing activities, has attracted soaring interest. Undeniably, the comprehensive utilization of mineral processing wastewater is not only an essential way to solve the shortage of water resources but is also an efficient path to achieve the cleaner production of mineral resources. Therefore, detailed studies on the purification of wastewater, extraction of valuable resources from wastewater, and technologies for the comprehensive utilization of wastewater and cleaner production of mineral resources are now major areas of research and provide the theoretical basis and technical support for efficient mineral processing. In light of these considerations, this Special Issue invites the latest advances in the comprehensive utilization of mineral processing wastewater to facilitate the sustainable development of the mining industry. Consequently, submissions dealing with mineral processing wastewater are welcome and encouraged.

Prof. Dr. Shaojun Bai
Prof. Dr. Qicheng Feng
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • mineral processing wastewater
  • flotation theory and technology
  • environmental protection
  • cleaner production
  • separation and purification

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Published Papers (3 papers)

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Research

13 pages, 3555 KiB  
Article
Comparative Analysis of the Recovery of Cu2+ and Au from Washing Solution of Pyrite Concentrate Slag by Two Processes
by Kun Zhu, Lei Qi and Libo Zhang
Minerals 2024, 14(9), 921; https://doi.org/10.3390/min14090921 - 7 Sep 2024
Viewed by 726
Abstract
A large amount of pyrite concentrate slag washing solution is produced in China every year, and this contains valuable components such as Cu2+ and Au. The traditional treatment method not only pollutes the environment but also wastes metal resources. For the washing [...] Read more.
A large amount of pyrite concentrate slag washing solution is produced in China every year, and this contains valuable components such as Cu2+ and Au. The traditional treatment method not only pollutes the environment but also wastes metal resources. For the washing solution containing Cu2+ 437 mg/L and Au 0.13 mg/L, two new processes comprehensive recovery schemes were developed and compared in this paper, namely iron powder replacement pore filtration and neutralization precipitation pore filtration. When the iron powder replacement pore filtration process was adopted, Cu2+ and Au were mainly comprehensively recovered in the form of a mixture of sponge copper and particulate gold. The test results showed that the replacement optimal conditions involved a pH of 3.0, iron powder dosage of 6 g/L, and replacement time of 3.0 h. After replacement, the filter cloth with below 1 μm pore size was used for filtration. The recovery rate of Cu2+ in the washing solution was 98.13 and the total recovery rate of Au was 95.83%. Otherwise, when the neutralization precipitation pore filtration process was adopted, Cu2+ and Au were mainly comprehensively recovered in the form of a mixture of copper hydroxide and particulate gold. The test results showed that sodium hydroxide was used as the precipitant and the optimum neutralization pH value was 6.5. After precipitation, the filter cloth with a below 1 μm pore size was used for filtration. The recovery rate of Cu2+ in the washing solution was 97.35% and the total recovery rate of Au was 93.54%. The economic benefit estimation of the two processes showed that the neutralization precipitation pore filtration process had the advantages of low material consumption, low cost and high economic benefit. Full article
(This article belongs to the Special Issue Comprehensive Utilization of Mineral Processing Wastewater)
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22 pages, 5129 KiB  
Article
Influence of Sulfate and Nitrate for Lanthanum (III) Adsorption on Bentonite: Implications for Rare Earth Wastewater Disposal
by Zongke Zhou, Quan Wan, Wenbin Yu, Xin Nie, Shuguang Yang, Shuqin Yang and Zonghua Qin
Minerals 2024, 14(3), 268; https://doi.org/10.3390/min14030268 - 2 Mar 2024
Viewed by 1691
Abstract
The direct discharge of rare earth wastewater causes the waste of resources and heavy metal pollution. This paper compared the adsorption behaviors of lanthanide ions on bentonite under sulfate and nitrate systems by examining the factors affecting the adsorption, such as adsorption time, [...] Read more.
The direct discharge of rare earth wastewater causes the waste of resources and heavy metal pollution. This paper compared the adsorption behaviors of lanthanide ions on bentonite under sulfate and nitrate systems by examining the factors affecting the adsorption, such as adsorption time, pH, background electrolyte concentration, and initial rare earth ion concentration. It was shown that the sulfate system was more favorable for the adsorption of rare earth ions on the bentonite surface. The maximum adsorption capacity in the sulfate system was about 1.7 times that in the nitrate system. In contrast, the adsorption under the nitrate system was more sensitive to the changes in pH and background electrolyte concentration. The adsorption processes under both systems are spontaneous physical adsorption processes (ΔGθ are from −27.64 to −31.48 kJ/mol), and both are endothermic (ΔHθ are 10.38 kJ/mol for the nitrate and 7.53 kJ/mol for the sulfate) and entropy-increasing (ΔSθ are 61.54 J/mol for the nitrate and 76.24 J∙mol−1 for the sulfate) processes. This study helps to provide information about the optimizing process parameters for the adsorption treatment of rare earth wastewater using bentonite. Full article
(This article belongs to the Special Issue Comprehensive Utilization of Mineral Processing Wastewater)
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12 pages, 6853 KiB  
Article
Natural Pyrite as a Catalyst for a Fenton Reaction to Enhance Xanthate Degradation in Flotation Tailings Wastewater
by Xiang Gong, Suqi Li, Jiaqiao Yuan, Zhan Ding, Anmei Yu, Shuming Wen and Shaojun Bai
Minerals 2023, 13(11), 1429; https://doi.org/10.3390/min13111429 - 10 Nov 2023
Viewed by 1317
Abstract
The efficient treatment of mineral-processing wastewater has attracted soaring interest recently. This study’s objective was to degrade xanthate from flotation tailings wastewater using a pyrite-catalyzed Fenton system. A sodium butyl xanthate (SBX) removal rate of more than 96% was achieved via the method [...] Read more.
The efficient treatment of mineral-processing wastewater has attracted soaring interest recently. This study’s objective was to degrade xanthate from flotation tailings wastewater using a pyrite-catalyzed Fenton system. A sodium butyl xanthate (SBX) removal rate of more than 96% was achieved via the method under optimal conditions (a H2O2 concentration of 0.5 mM, a FeS2 concentration of 0.5 g/L, an initial SBX concentration of 100 mg/L, and a natural pH of 9.36 ± 0.5), which is 12.85% higher than with a H2O2 system. An appropriate concentration of natural pyrite can act as a catalyst to significantly improve the oxidation capacity of H2O2. Additionally, the results of electron paramagnetic resonance and quenching measurements suggest that hydroxyl radicals (•OH) are the main active species in the H2O2-FeS2 system. The possible reaction mechanism is proposed. The H2O2 adsorbs onto the pyrite surfaces and reacts with Fe2+, triggering the formation of •OH and Fe3+. The •OH most likely attacks the SBX that adsorbs on the pyrite surface or exists in the solution and promotes the transformation of the SBX anion (C4H9OCS2−) into the intermediate butyl xanthate peroxide (BPX, C4H9OCS2O−). Finally, BPX intermediates are likely further oxidized to smaller products such as SO42−, CO2, and H2O under the ongoing attack of •OH. Full article
(This article belongs to the Special Issue Comprehensive Utilization of Mineral Processing Wastewater)
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