Minerals
·
2022
·Vol. 12
·期 6
·763
·
IF 2.818
Xiao Wang,Jixiong Zhang,Meng Li,Feng Gao,Abbas Taheri,Binbin Huo,Ling Jin
The cemented backfill (CB) utilizing coal gangue (CG) and fly ash (FA) is widely applied in coal mines. However, the bleeding and shrinkage of CB leads to insufficient contact with surrounding rock, which is not beneficial for controlling roof subsidence and even stope stability. Herein, a cemented foam backfill (CFB) formulation is demonstrated, employing hydrogen dioxide (H2O2) as a chemical foaming agent. The cement and FA show noticeable inhibiting effects on volume expansion due to the network formed by their hydrates. Moderately lower cement, FA, and solid concentration are beneficial to improve volume increment and prolong expanding duration. A foaming coefficient (k) is proposed in theory to evaluate the foaming efficiency. Thekemvalues, determined by volume evolution experiments of CFB slurries, provide a calculation basis for the needed dosage of H2O2solution targeting specific volume increment. CFB specimens with expanding ratios of 21%~103% and densities of 994~592 kg/cm3were prepared, with an actual foaming coefficient of 52.40 cm3/g and uniaxial compressive strength (UCS) of 0.32~0.55 MPa. The mass of H2O2solution was 1.9%~11.3% of cement and 0.29%~1.67% of total solid materials by weight. The UCS decline compared to CB was attributed to rich pores observed by CT and carbonation indicated by X-ray diffraction (XRD).Keywords:backfill mining;coal gangue;hydrogen dioxide;chemical foam
研究领域:
矿业工程
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材料科学
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DOI
高影响因子
POLYMER COMPOSITES
·
2014
·Vol. 35
·期 10
·2056-2066
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IF 1.455
Xiangming Hu,Yanyun Zhao,Weimin Cheng,Deming Wang,Wen Nie
In this study, phenol, urea, and paraformaldehyde were used as the monomers for the one-step synthesis of phenol-urea-formaldehyde (PUF) foaming resin that was used to block air leakage in mining. An orthogonal test was used to study the effects of urea amount, catalyst amount, reaction temperature, and reaction time on the foaming property of the resin. The results showed that the optimum parameters for synthesizing PUF resin are as follows: 1 mol phenol, 0.5 mol urea, 3 mol formaldehyde equivalents of paraformaldehyde, and 0.05 mol catalyst at 75°C for 3 h. The infrared and 13 C nuclear magnetic resonance spectra of the PUF resin showed that the chemical structure of the PUF resin was significantly different from that of phenol-formaldehyde resin, indicating that a copolymerization reaction has occurred among the three components, that is, phenol, urea, and paraformaldehyde. In this study, PUF foam was prepared from catalysts and PUF resin. The results showed that the foaming capacity and oxygen index of the PUF foam were significantly improved by using urea, whereas the shrinking percentage decreased with no change in compression strength. POLYM. COMPOS., 35:2056–2066, 2014. © 2014 Society of Plastics Engineers
研究领域:
材料科学
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矿业工程
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DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-13
·
IF 3.8
Bu Daolu,Yang Hu,Zhang Haibo,Wang Liang,Wang Jiao,Liao Jie
The present study investigates the efficacy of newly developed Zr-based metal–organic frameworks, specifically MIP-206, and its amine-modified counterpart, MIP-206-NH 2 , for the re-covery of antimony (Sb) from both synthetic and actual mining wastewater. Batch method studies were employed to examine the effect of waste media pH, Sb concentration, process kinetics, and the performance of the regeneration solution. MIP-206-NH 2 exhibited impressive separation capabilities, achieving 102.18 mg/g and 63.23 mg/g for Sb (V) and Sb (III), respectively. In contrast, the pristine MIP-206 reached maximum values of 26.26 mg/g for Sb (V) and 16.95 mg/g for Sb (III). The separation process was well-described by the Langmuir equation, and the kinetics followed the pseudo-second-order model. Although the amine modification resulted in a decrease in the surface area of MIP-206 from 1345.21 to 1169.86 m 2 /g, SEM and XRD analyses confirmed that the structural integrity of MIP-206-NH 2 remained unchanged. In terms of reusability, MIP-206-NH 2 maintained up to 90% of its separation performance over 9 cycles, while MIP-206 demonstrated effectiveness for 7 cycles. The regeneration solution exhibited a capacity of approximately 0.63 mol/L for Sb (V) and 0.71 mol/L for Sb (III). Furthermore, MIP-206 and MIP-206-NH 2 demonstrated successful application in selectively separating Sb from real mining wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Ganchen Zhou,Xiaoying Jin,Zuliang Chen
Ionic rare earth mining wastewater contains a certain amount of rare earth elements (REEs). Given the scarcity and great application potential of REEs, this study explored the potential of employing manganese nanoparticles (GT-Mn) derived from green tea to recover REEs from mining wastewater. The maximum adsorption efficiencies of GT-Mn on REEs were 98.50 % (Y), 94.85 % (La), 73.33 % (Gd), 75.00 % (Dy), and 81.25 % (Yb), respectively. Characterizations were conducted to elucidate the mechanism of GT-Mn in the recovery of REEs. The findings revealed that the adsorption capacity of GT-Mn for REEs is predominantly attributed to the presence of organic functional groups, including tyrosine and theanine, along with the interactions of Mn O bonding interactions. Moreover, the zeta analysis supported the electrostatic interaction between GT-Mn and REEs. Thus, the key physicochemical properties of REEs removal by GT-Mn were statistically analyzed by Pearson's correlation analysis, indicating that the removal mechanism of REEs included complexation and electrostatic force. The desorption of REEs from GT-Mn in 0.01 M acetic acid (CH 3 COOH) solution showed that the desorption efficiency of REEs exceeded 75.00 %. Overall, GT-Mn demonstrates significant potential and advantages in the realm REEs recovery, which can achieve the dual benefits of environmental remediation and resource conservation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
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2024
·Vol. 14
·期 4
·360
·
IF 2.2
Gaofeng Wang,Bowen Ling,Xiaoliang Liang,Jie Xu,Shichang Kang,Jingming Wei,Wei Tan,Runliang Zhu,Jianxi Zhu,Hongping He
Electrokinetic mining (EKM) is a novel method for rare earth element (REE) mining that can achieve green and efficient recovery of REEs. However, as yet, there is no accurate model for describing the electrokinetic transport of REEs in weathering crusts, and this hinders the wider application of EKM. The conventional model fails to capture the microscale transport physics occurring in the nanochannels that exist ubiquitously in weathering crusts. Consequently, the existing models cannot distinguish the mobilities of different REEs. Here, we report a new model for a more faithful description of the electrokinetic transport of REEs in weathering crusts that considers the ionic size, which has previously been neglected. We reveal that the electrokinetic transport of heavy REEs (HREEs) is faster than that of light REEs (LREEs) in weathering crusts, which is contrary to the predictions of conventional models. Our model was validated experimentally by measurements of the electrokinetic transport of two LREEs (La and Sm) and an HREE (Er) in weathering crusts. The speed of electrokinetic transport follows the order Er > Sm > La. Our findings suggest that the ionic size is a non-negligible factor affecting the electrokinetic transport of REEs in weathering crusts containing nanochannels. This work offers a constitutive model to describe the electrokinetic transport of REEs in weathering crusts, which promotes both theoretical developments and practical applications of EKM.
研究领域:
环境科学
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矿物工程
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Emilia J. Virtanen,Esa Kukkonen,Janne Yliharju,Minnea Tuomisto,Janne Frimodig,Kimmo Kinnunen,Elmeri Lahtinen,Mikko M. Hänninen,Ari Väisänen,Matti Haukka,Jani O. Moilanen
Herein we report the use of nylon-12-based 3D-printed filters incorporating α-aminomethylphosphonic acid as an active additive for the recovery of Y, Nd, and Dy from the mining waste solution containing Al, K, Ca, Sc, Fe, Co, Cu, Zn, Y, Nd, Dy, and U. Nylon-12 was chosen for the polymer matrix of the filter due to its inactivity towards the studied metals. The micrometer-level structure of the filters was studied with a scanning helium ion microscope and X-ray tomography to reveal the porosity, pore size, and active additive distribution in the filters. Furthermore, FTIR spectroscopy was used to analyze the compositional changes in the 3D-printed filters after the printing and adsorption processes. Adsorption of the metals was studied at a pH range of 1–4, and the following adsorption trend Sc > Fe > U > Y, Nd, Dy > Al, Cu, Zn > K, Ca, Co was observed in each of the studied pH values. The sequential recovery process for metals was studied at pH 2, and desorption of the metals from the filters was performed with 6 M HNO 3 . 100 % adsorption of REEs, Fe, and U was achieved during the recovery process, and on average, over 88 % of the adsorbed Y, Nd, and Dy were desorbed from the filters. In contrast to Y, Nd, and Dy, the desorption of Sc, Fe, and U was minimal (Fe and U) or negligible (Sc) with 6 M HNO 3 due to their strong coordination to the active additive. Maximum adsorption capacities for Y, Nd, Dy, and U were determined by using linear Langmuir adsorption isotherm. The best maximum adsorption capacity was determined for Sc, Q max = 0.51 mmol/g followed by U, Nd, Dy, and Y with capacities of 0.47, 0.24, 0.23, and 0.17 mmol/g, respectively. Overall, this study achieved a complete removal of Sc, Fe, and U from the simulated mining waste solution leaving a final eluate that mainly contained Y (320 μg), Nd (350 μg), Dy (330 μg), and Al (710 μg) demonstrating the applicability of the 3D-printed filters in the recovery of Y, Nd, and Dy from the multimetal solution.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Na Zhu,Qian Yan,Yupeng He,Xingyang Wang,Zhina Wei,Dong Liang,Huifeng Yue,Yang Yun,Guangke Li,Nan Sang
Nanoplastic has become a prominent threat to the aquatic ecosystem , and the cost-effective technologies for controlling that are still insufficient. The aim of this study is to use contaminated corncobs collected in mining area to prepare functional mesoporous biochar (MBC) and to investigate its ability to remove polystyrene nanoplastics (PSNPs) from water. The adsorption of PSNPs by MBC could be better described by the Sips isotherm and followed the second-order kinetics, with the theoretical maximum adsorption capacity of MBC for PSNPs was 56.02 mg·g −1 . Then the PSNPs adsorbed on MBC could be hydrothermally degraded and the biochar could be simultaneously regenerated. The ability was affected by various factors, including oxygen-containing functional groups, metallic components, superoxide radicals and holes. The degradation products were dominated as low-molecule-weight oligomers and the main possible pathways involved scission , hydrolysis and radical reaction. The findings highlight the great potential of biochar prepared using contaminated biowaste in mining area to remove the nanoplastic pollutants in the aqueous environment.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Environmental Science-Water Research & Technology
·
2023
·Vol. 9
·期 5
·1480-1490
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IF 5
Yalan Liu,Hui Zhang,Yang Ding,Nan Hu,Dexin Ding
Dissolved uranium in groundwater contaminated by acid in situ leaching poses a serious threat to human health and the ecosystem due to its toxicological properties. In this article, carboxy methyl cellulose (CMC) with high dispersity was used to stabilize nano zero-valent iron (nZVI), and highly dispersed CMC-stabilized nZVI (CMC-nZVI) was synthesized by a liquid-phase reduction method, characterized by multiple analysis techniques, and tested for its dispersal and antioxidizing properties. Compared with nZVI, CMC-nZVI showed great dispersal and resistance to oxidation. The effects of oxygen, pH, dosage, initial U(VI) concentration and HA concentration on U(VI) elimination by CMC-nZVI, and the U(VI) removal kinetics and mechanism were investigated. The removal capacity of U(VI) by CMC-nZVI was 400 mg g−1 at pH 3.0, and the dose of 0.1 g L−1 showed excellent uranium removal efficiency under acid conditions. Moreover, CMC-nZVI was used to treat groundwater from an area after acid in situ leach uranium mining, and CMC-nZVI was found to be capable of decreasing the concentration of uranium in the acidic groundwater (pH < 3) from 0.321 to 0.001 mg L−1. The results indicate that CMC-nZVI has potential application prospects in the in situ remediation of groundwater in areas after acid in situ leach uranium mining.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Shuhui Wei,Ali Reza Kamali
Xanthates are largely used in the mining industry as mineral flotation agents, causing serious environmental problems, and therefore, removing them effectively is a significant barrier for sustainable green mining that needs to be addressed. Here, nanostructured mesoporous CoFe 2 O 4 /Co 3 Fe 7 @carbon prepared by clean and facile mechanochemical-molten salt process is employed as a trifunctional magnetic adsorbent-photocatalyst agent (M-APh) for the efficient adsorption of potassium ethyl xanthate (KEX) from its solutions in dark, and the photocatalytic degradation of the compound under LED-light irradiation. The surface- and bulk‑carbon content of M-APh is evaluated to be around 88 and 80 wt%, with the surface area of 355 m 2 /g and the average pore size of 3.7 nm, enabling the adsorption of 6.12 wt% KEX on its surfaces in dark. The ferromagnetic performance of M-APh, characterized by the coercivity (H c ), saturation magnetization (M s ) and remnant (M r ) values of 735 Oe, 17.9 emu/g and of 6.1 emu/g, respectively, is an asset supporting the facile separation of the agent from its suspensions. The effects of various parameters including the concentration of KEX in the solution, the dosage of M-APh, the wavelength of the LED-light, and the initial pH on the KEX removal performance of M-APh are studied. Within 5 h of LED-light irradiation of wavelengths 450, 385 and 365 nm, the KEX removal rates are recorded at 96.59, 98.61 and 99.49 %, respectively. Possible mechanisms involved in the adsorption and photocatalytic degradation of KEX are discussed.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Wen-Jun Wu,Qing-Jun Zheng,Jing-Wen Liang,Hai-Ming Zhao,Bai-Lin Liu,Yan-Wen Li,Nai-Xian Feng,Quan-Ying Cai,Lei Xiang,Ce-Hui Mo,Qing X. Li
Xanthates , common mining flotation reagents, strongly bind thiophilic metals such as copper (Cu), lead (Pb), cadmium (Cd), and zinc (Zn) and consequentially change their bioavailability and mobility upon their discharge into the environment. However, accurate quantification of the metal-xanthate complexes has remained elusive. This study develops a novel and robust method that realizes the accurate quantification of the metal-xanthate complexes resulted from single and multiple reactions of three typical xanthates (ethyl, isopropyl, and butyl xanthates) and four thiophilic metals (Cu, Pb, Cd, and Zn) in water samples. This method uses sulfur (S 2- ) dissociation, followed by tandem solid phase extraction of C 18 + PWAX and subsequent LC-MS/MS analysis. It has a wide linearity range (1–1000 μg/L, R 2 ≥ 0.995), low method detection limits (0.002–0.036 μg/L), and good recoveries (70.6–107.0 %) at 0.01–10 mg/L of xanthates. Applications of this method showed ubiquitous occurrence of the metal-xanthate complexes as the primary species in flotation wastewaters, which the concentrations were 4.6–28.9-fold higher than those previously determined. It is the first quantitative method established for the analysis of metal-xanthate complexes in water samples, which is of great importance to comprehensively understand the fate and risks of xanthates in the environment.
研究领域:
环境化学
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分析化学
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采矿工程
✓ 已验证
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DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Wenpeng Li,Qingping Wang,Xiaoying Jin,Nasreen Islam Khan,Gary Owens,Zuliang Chen
Wastewater generated during mining remains a significant source of antimony pollution, because techniques to quickly and efficiently remove antimony from wastewater do not exist. In this study, zeolitic imidazolate framework-8 (ZIF-8), a specific type of Metal Organic Frameworks (MOFs), was successfully used to remove trace levels (1 mg L −1 ) of Sb(V) with a high removal efficiency when the ZIF-8 dose was 0.5 g L −1 . Scanning electron microscopy-X-ray energy dispersive spectrometry (SEM-EDS) indicated that Sb(V) was adsorbed onto the ZIF-8surface. The powder X-ray diffraction (XRD) pattern of ZIF-8 before and after adsorption of Sb(V) indicated that ZIF-8 was successfully synthesized, and remained structurally stable after Sb(V) was adsorbed. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) both suggested complexation of zinc on ZIF-8 with Sb(V), where removal of Sb(V) by ZIF-8 followed the Langmuir adsorption isotherm with pseudo second-order kinetics. Thus, a possible removal mechanism was proposed which involved Sb(V) complexing with the zinc hydroxyl groups on ZIF-8 (Zn–OH–Sb). Practically, ZIF-8, could remove 78.6% of Sb(V) from a mining wastewater containing 20 μg L −1 Sb(V). Furthermore, ZIF-8 could be remain active after repeated uses and could still remove and 42.3% of Sb(V) from wastewater containing 1 mg L −1 ) Sb(V) even when the ZIF-8 was reused five time. This indicated that ZIF-8 had potential for practical removal of Sb(V) from mining wastewaters.
研究领域:
环境科学
·
水处理
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）