MINERALS ENGINEERING
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2022
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IF 5.479
Lianghua Wang,Pingfeng Fu,Yanhong Ma,Xuejin Zhang,Yabao Zhang,Xiumin Yang
Flotation reagents and heavy metal ions always coexist in mineral flotation wastewaters, arousing serious environmental issues or having deleterious effects on mineral flotation. In this work, the steel slag was adopted as a cost-effective adsorbent to synergically remove butyl xanthate (BX), diethyl dithiocarbamate (DDTC), Cu(II) and Pb(II) ions. At the steel slag dosage of 12.0 g/L, Cu(II) and Pb(II) concentrations decreased from 4.0 mg/L to below 10.0 μg/L, and the removal of COD reached 54.33%. The removal efficiency of COD increased from 11.36% to 57.49% as Cu(II) and Pb(II) concentrations rose from 0 to 8.0 mg/L, revealing the promotion effects of metallic ions on collector adsorption. The maximum uptake capacity of steel slag reached 110.45 and 160.48 mg/g for Cu(II) and Pb(II), respectively. The collector adsorption capacity of steel slag increased nearly two magnitudes after modifying with the uptake of Cu(II) or Pb(II) ions. The SEM/EDS, XPS and FTIR analysis indicated that steel slag could be in-situ modified to generate copper or lead hydroxides and oxides during the removal of Cu(II) and Pb(II) ions. Subsequently, these precipitates acted as reactive sites for chelating BX and DDTC to form indissolvable metal-collector chelates. Owing to in-situ modification of steel slag by uptaking metallic ions, the adsorption was potentially feasible for treating flotation wastewaters.
研究领域:
环境科学
·
矿物工程
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DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2021
·
IF 10.204
Liming Yang,Genping Yi,Bo Wang,Penghui Shao,Yufa Feng,Yanbiao Liu,Kai Yu,Fuqiang Liu,Lingling Liu,Xubiao Luo,Shenglian Luo
Simultaneous recovery and value-added conversion of hazardous heavy metal ions from complex wastewater sources is of great significance yet challenging. Herein, we demonstrate that highly toxic antimonite Sb(III) could be effectively recovered from antimony (Sb) mine flotation wastewater and converted into high-value-added metallic Sb using a novel facile atomic H* enhanced electrochemical reduction avenue coupled with thermal reduction by H 2 gas. The high production of atomic H* generated from the electrochemical cathode with an optimum reduction potential of –1.2 V vs . Ag/AgCl, which is lower than the Sb(III) reduction potential of –1.0 V, might be attributable to the superior Sb recovery capabilities. Furthermore, the metallic Sb concentration at –1.2 V was 14.43 times greater than at –1.0 V due to the strong reductivity of atomic H*. In addition, Sb(III) removal efficiency was found to be as high as 98.52%, with a metallic Sb recovery rate of up to 1.67 mg min –1 . The efficiency of Sb(III) recovery was demonstrated throughout a wide pH range, with metallic Sb being the main product, independent of the presence of multiple coexisting ions. Economic analysis also indicated that treating Sb mine flotation wastewater per ton may yield a net profit of $40.09. This research contributes to the advancement of an atomic H* enhanced electrochemical technology for high-valued heavy metal recovery from complex heavy metal-polluted wastewater.
研究领域:
环境科学
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冶金工程
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电化学工程
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DOI
高影响因子
CHROMATOGRAPHIA
·
2021
·Vol. 84
·期 5
·463-471
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IF 2.044
Huang Xiaofen,Zhang Qin,Li Xianbo,Ao Xianquan,Wang Xuming
Alkyl amines are surfactants used as quartz collectors in the reverse flotation of phosphate ores. It is important in both research and industrial practice to quantify amine concentration in the solution and/or wastewater. A simple and rapid method using high-performance liquid chromatography (HPLC) was developed to quantitatively determine the concentration of amine collectors (including dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine) in a mineral flotation system. The method involved a sample derivatization procedure with 9-fluorenyl methoxycarbonyl chloride (FMOC-Cl) and separation/determination by HPLC coupled with a fluorescence detector. The calibration curves showed good linearity ( R 2 > 0.9956) in the range of 0.20–5.00 µg/mL, and the recoveries of dodecylamine, tetradecylamine, hexadecylamine, and octadecylamine were in the ranges of 84.93–97.64%, 89.93–101.92%, 85.29–98.37%, and 93.57–103.26%, respectively. The method was successfully used to quantify amines in wastewater from flotation experiments and artificial flotation wastewater (amine solution after activated carbon adsorption). The results from the analysis of four amines in the solution demonstrated that the proposed method is suitable for the simultaneous determination of amines in flotation pulp and wastewater.
研究领域:
分析化学
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矿物加工工程
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DOI
高影响因子
International Journal of Environmental Science and Technology
·
2024
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IF 3
Xu X.,Zhu L.,Chen C.,Luo C.,Jin Z.,Sun Z.,Fu Z.T
The study employed a direct hydrothermal method to synthesize NiO/La-KTaO 3 heterojunction photocatalysts. The photocatalytic efficiency of the composites was assessed by their ability to destroy isoamyl xanthate in the presence of Ultraviolet light, mimicking the conditions seen in flotation wastewater. The results showed a significantly greater photocatalytic activity when comparing the composite catalyst to KTaO 3 . A photocatalytic reaction was performed utilizing a 40 mg NiO/K 1−x La x TaO 3 (x = 0.04) photocatalyst at pH = 3. The reaction was carried out using 50 mL of isoamyl xanthate synthesis wastewater, which had a concentration of 20 mg/L. The degradation rate achieved after 30 min was 87.28%. The addition of nickel oxide (NiO) and the introduction of La into the K lattice position were thought to facilitate charge separation, migration, and the generation of additional active sites, hence augmenting the catalytic impact. The findings from radical capture tests indicated that the ·O 2− (superoxide ion) served as the principal active species in the photocatalytic process, playing a substantial role. The process of photodegradation of isoamyl xanthate was determined through the utilization of different analytical and testing methods. This work introduces a direct and effective approach for the eco-friendly decomposition of xanthate flotation wastewater.
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
MINERALS ENGINEERING
·
2025
·
IF 5
Zeen Yu,Pingfeng Fu,Lianghua Wang,Yuliang Zhang,Wei Deng
Advanced oxidation processes for treating flotation wastewater suffer from low oxidation efficiency and secondary pollution. Here, the novel microbubble catalytic ozonation, combining steel slag as a cost-effective and efficient catalyst with microbubbles as an advanced form of aeration, was proposed to treat simulated flotation wastewater containing butyl xanthate (BX), O-isopropyl-N-ethyl thionocarbamate (Z-200), terpineol, and sodium humate. The chemical oxygen demand (COD) removal efficiency and mineralization rates of organic flotation reagents were compared by macrobubble/microbubble ozonation, macrobubble/microbubble catalytic ozonation. The employing of microbubbles increased the removal efficiency of COD in ozonation from 31.45 % to 50.42 %, followed by the mineralization rates of C, S, and N increasing from 19.57 % to 33.45 %, 28.90 % to 48.16 %, and 21.80 % to 31.82 %, respectively. Importantly, the addition of steel slag (0.5 g/L) further enhanced COD removal efficiency (58.34 %) and C (41.56 %), S (53.76 %), N (37.88 %) mineralization rates. Both EPR and dissolved ozone concentration variations demonstrated that steel slag effectively promoted ozone decomposition and hydroxyl radical (•OH) generation, confirming its catalytic role. The degradation pathways of organic flotation reagents with microbubble catalytic ozonation were proposed, mainly relying on the oxidation of organic flotation reagents by the products generated from ozone decomposition. The combined application of steel slag and microbubbles effectively overcame the low ozone solubility and slow •OH generation rate associated with ozonation alone, presenting a powerful strategy for enhancing organic flotation reagents degradation.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 82
·期 5
·861-876
·
IF 1.638
Zhang Liping,Wu Shengnian,Xiang Jun,Jiao Xiaofei,Wang Jing
Salicylhydroxamic acid is an effective and selective collector for tungsten and molybdenum ores. However, the salicylhydroxamic acid flotation wastewater discharge may cause damage to the water environment for the residual processing reagents with poor biodegradability. Combined O 3 and biological aerated filter (BAF) has a well-known potential for removing refractory or toxic organic pollutants. Combined process of O 3 and BAF (O 3 -BAF) was applied to treat the simulated wastewater from W-Mo mineral processing in this study. Compared single ozonation to O 3 -BAF, various influencing factors were discussed like O 3 dosage, reaction time, initial pH value, gas–water ratio and organic loading. Meanwhile, degradation mechanism of salicylhydroxamic acid was reduced. Under the optimal experiment conditions as pH value 8, O 3 dosage 1.3 mg·L −1 , reaction time 15 min, the five-day biochemical oxygen demand (BOD 5 )/chemical oxygen demand of potassium dichromate (CODCr) value increased to from 0.19 to 0.35. The effluent was pumped to the following BAF process, when the optimal experiment conditions was organic load = 0.82 kgCODCr (m −3 ·d −1 ), gas-water ratio = 6:1, CODCr concentration of effluent was 28.92 mg·L −1 and the removal ratio was 86.26%, while the removal ratio could higher to 91.12% for the O 3 -BAF combined process. The effluent could meet the discharge and reuse emission standards requirements in China. UV-vis absorption spectra and high performance liquid chromatography showed the degradation pathway of salicylhydroxamic acid by ozone oxidation was salicylhydroxamic acid → salicylic acid + hydroxylamine → catechol → maleic → small molecular organic acid → carbon dioxide + water. Salicylhydroxamic acid (SHA) is considered as an effective and selective collector for flotation. Combined O 3 -BAF has a well-known potential for removing refractory or toxic organic pollutants. Degradation mechanisms of salicylhydroxamic acid was reduced. Effluent could not reach the discharge or reuse standard in China. The BOD 5 /CODCr value increased to 0.35 after only 15 min reaction, which could meet the requirement of the following biological treatment. The degradation pathway was deduced as the following: salicylhydroxamic acid → salicylic acid + hydroxylamine → catechol → maleic → small molecular organic acid → carbon dioxide + water.
研究领域:
环境科学
·
化学工程
·
矿物加工
·
水污染控制
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DOI
高影响因子
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