MINERALS ENGINEERING
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2025
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IF 5
Jingyang Shi,Jing Lv,Jieliang Wang,Zhao Cao,Wenda Lu,Yongdan Cao,Xu Wu,Xiaoping Wang,Jiayan Tang,Zhenyue Zhang,Ru-an Chi
The flotation separation of parisite from calcium-bearing gangue minerals, such as fluorite and calcite, poses a significant challenge in the rare earth ore production process. In this study, an eco-friendly and highly selective depressant polyaspartic acid (PASP) was adopted in the flotation separation of parisite from calcite and fluorite, and its depression mechanism was investigated through various surface analysis and testing methods, including zeta potential tests, contact angle measurements, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). The flotation test results indicated that PASP significantly inhibited the flotation of fluorite and calcite, with negligible effect on parisite when using octyl hydroxamic acid (OHA) as a collector at weak alkaline pH. The artificial mixed mineral flotation proved that PASP could achieve effective flotation separation of parisite from calcite and fluorite. Zeta potential tests and FTIR analyses demonstrated that the adsorption of PASP prevented OHA adsorption on calcite and fluorite surfaces, with minimal impact on OHA adsorption on parisite surface. XPS analyses confirmed that PASP was mainly chemisorbed on the surfaces of calcite and fluorite through the chelation reaction between polar groups (–NH– and –COO − ) of PASP with the Ca 2+ on these surfaces. AFM clearly showed the agglomerative adsorption of PASP on the surfaces of fluorite and calcite. Thus, PASP could be an efficient depressant for calcite and fluorite in parisite flotation, providing novel insights into addressing rare earth ore flotation challenges.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Jun Liang,Xiaoyun Xu,Qijun Zhong,Zibo Xu,Ling Zhao,Hao Qiu,Xinde Cao
Biochar as an environmental-friendly and low-cost catalyst has gained increasing attention in the catalytic degradation of organic pollutants. However, the roles of endogenous mineral constituents in biochar in the catalytic degradation are still unclear. In this study, the mineral-rich biochar produced from sewage sludge at 400 °C (SS400) and 700 °C (SS700) and their corresponding demineralized biochar (DSS400 and DSS700) were used to be the persulfate (PS) activator for phenol degradation. Results showed that the mineral-rich biochar + PS system had negligible phenol degradation (≤12.6 %), whereas distinct degradation of phenol were obtained in the demineralized biochar + PS system where DSS400 + PS and DSS700 + PS exhibited 36.3 % and 57.8 % degradation, respectively. Different minerals in mineral-rich biochar exhibited varying functions on phenol degradation. Mg and K in biochar had less effect on the phenol degradation, while Fe-containing minerals favored the phenol degradation. However, Ca-containing minerals more greatly reduced the formation of hydroxyl radical, resulting in more inhibited degradation of phenol. Thus, the overall degradation of phenol was reduced by the mineral-rich biochar. The findings indicated that the inherent minerals in biochar were not favorable for the phenol degradation, which guides us the application of biochar containing different minerals in the remediation of organic pollutants.
研究领域:
环境科学
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污染治理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Ruiqi Ge,Bingqiao Yang,Rudolph Martin,Huihua Luo,Dongsheng He,Mario Alberto Corona Arroyo
Poly (sodium 4-styrene sulfonate) was tested as a novel and efficient depressant for the selective flotation of apatite and dolomite in this work. The separation performances were evaluated and the interaction mechanisms were uncovered. Flotation results illustrated that PSS strongly depressed dolomite, while it hardly affected the flotation of apatite. Zeta potential and Fourier Transform Infrared Spectrometer results indicated that the adsorption of PSS on dolomite was more favorable than that on apatite, which impeded sodium oleate to adsorb on dolomite surface and rendered it hydrophilic. XPS results indicated that -SO 3 − groups of PSS strongly complexed with both Ca 2+ and Mg 2+ sites on dolomite surface, but PSS weakly interacted with apatite surface and hardly affected the adsorption of NaOL on apatite surface. PSS exhibited excellent selectivity and environmental compatibility, which could simplify the flotation processes in upgrading phosphate ores through one-step direct flotation.
研究领域:
矿物加工工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Central South University
·
2024
·Vol. 31
·期 3
·796-812
·
IF 3.7
Guan Zhi-wen,Jiao Fen,Wang Xu,Qin Wen-qing,Fu Li-wen,Zhang Zheng-quan,Li Wei
In this paper, the inhibition ability of tetrasodium pyrophosphate (TSPP), sodium tripolyphosphate (STPP) and sodium hexametaphosphate (SHMP) to scheelite, fluorite and calcite was predicted by performance calculation and further verified by micro-flotation test. The results of hydrophile lipophilic balance (HLB) calculation, group electronegative calculation and micro-flotation test indicated that the inhibition ability of phosphate to the three minerals increases with the increase of the number of phosphate groups and the order of inhibition ability of the three inorganic phosphates was SHMP > STPP > TSPP. STPP had great potential for flotation separation of scheelite from fluorite and calcite. The order of inhibition ability of STPP against the three calcium-bearing minerals is calcite>fluorite>scheelite. The results of contact angle measurement, adsorption amount measurement, X-ray photoelectron spectroscopy (XPS) analysis and atomic force microscope (AFM) imaging presented that the adsorption of STPP on the fluorite and calcite surface was much larger than that on the scheelite surface. The weak adsorption of STPP on the scheelite hardly influenced the collection of sodium oleate (NaOL). STPP could complex with Ca 2+ on the surface of fluorite and calcite, and hinder the subsequent adsorption of NaOL. The results can provide guiding significance for the flotation of scheelite and the screening of inhibitors for calcium-bearing gangue minerals.
研究领域:
矿物加工工程
·
化学工程与技术
✓ 已验证
产品关联
DOI
高影响因子
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