MINERALS ENGINEERING
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2018
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IF 2.707
Wencui Chai,Yanfang Huang,Weijun Peng,Guihong Han,Yijun Cao,Jiongtian Liu
The existence of sulfide minerals (mainly pyrite) limits the use of high-sulfur bauxite in the production of Bayer alumina. In this work, the reverse flotation desulfurization using 2-mercaptobenzimidazole (MBI) as the collector was studied by L 9 (3 4 ) orthogonal tests. The interaction mechanisms of MBI with pyrite were investigated by advanced analysis technologies including scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), contact angle testing and zeta potential analysis. Results indicate that the sulfur content of bauxite is decreased from 2.87% to 0.26% by one roughing and one cleaning flotation under the optimized conditions of collector dosage of 100 g/t, activator dosage of 60 g/t, frother dosage of 200 g/t and pulp pH at 3. MBI exhibits superior hydrophobic behavior on the pyrite surface under the acid solution than under the alkaline solution, which favors the flotation of pyrite under the acidic condition. The zeta potential, FTIR and XPS results reveal that the interaction mechanisms of MBI with pyrite are electrostatic forces and chelation by forming N Fe S coordination bonds. MBI is an efficient collector of pyrite in the flotation desulfurization of high-sulfur bauxite and is expected to be used in other oxide or sulfide ores to separate pyrite.
研究领域:
矿物加工工程
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冶金工程
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表面化学
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资源综合利用
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浮选化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Huaxia Li,Wencui Chai,Yijun Cao,Shichong Yang
Surface pretreatment on minerals prior to flotation was proved to increase the selectivity of separation process. Organic acid pretreatment of low-grade diasporic-bauxite was conducted, and the effects of oxalic acid on bauxite flotation were investigated in this work. The oxalic acid pretreatment mechanisms were studied by adsorption measurements, zeta potential testing, XPS analysis, and ICP analysis. The flotation results showed that the oxalic acid treatment could significantly improve Al 2 O 3 recovery from 75.39% to 81.88% and decrease SiO 2 recovery from 53.26% to 47.30%. The adsorption capacity of diaspore for sodium oleate (NaOL) increased by 8.50%, while that of kaolinite decreased by 11.72%. XPS analysis revealed that oxalic acid treatment improved the relative contents of unsaturated Al at diaspore surface beneficial to the adsorption of NaOL. While the relative content of Al at kaolinite surface was decreased due to the Al dissolution revealed by ICP results. Zeta potential analysis indicated that oxalic acid changed the surface property of minerals favorable for the selective adsorption of NaOL on diaspore surface rather than kaolinite surface. These findings provided a promising direction for surface pretreatment of low-grade bauxite using oxalic acid for the improvement of the flotation desilication.
研究领域:
矿物加工工程
·
表面化学
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资源综合利用
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浮选化学
·
冶金工程
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2019
·
IF 6.355
Lvping Fu,Huazhi Gu,Ao Huang,Yongshun Zou,Hongwei Ni
Lightweight materials containing nano-sized intracrystalline pores are reported, and their slag reaction behaviours are described. The introduction of nano-sized intracrystalline pores favouring the supersaturation of molten slag and the precipitation of solid phases at the reaction interfaces, and the isolation layer can prevent lightweight materials from further slag corrosion and penetration. Because the alumina materials have higher purity and a tight grain-bonding, they show the highest slag resistance. The impurities located between the grains are responsible for the deeper slag penetration of bauxite and magnesia materials. Moreover, the intergranular phases in the magnesia materials are interconnected, resulting in severe slag corrosion.
研究领域:
材料科学
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腐蚀工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Sikpaam Issaka Alhassan,Haiying Wang,Yingjie He,Lvji Yan,Yuxin Jiang,Bichao Wu,Ting Wang,Haiying Gang,Lei Huang,Linfeng Jin,Yongsheng Chen
Bauxite is a widely available Al-O-rich mineral with great potential for abating fluoride. However, low adsorption capacity, a narrow workable pH range, and a lack of clarity on the best removal mechanism hinder its application. In this work, a highly efficient bauxite nanocomposite (Bx-Ce-La@500) was synthesized via doping and pyrolysis , and its fluoride adsorption in industrial wastewater was examined. Doping Ce/La synergistically improved the fluoride adsorption affinity of the composite (from pH PZC 8.0 ~ 10.0) and enhanced the •OH. The materials were characterized by SEM-EDS, BET, XRD, and TGA while XPS, FTIR, and DFT were used to investigate the mechanism of fluoride sorption . Results show that Bx-Ce-La@ 500 has a positive zeta potential of 26.3–23.1 mV from pH 1~ 10. The Langmuir model was the best fit with a maximum adsorption capacity of 88.13 mg/g and removal efficiency up to 100% in 50 ppm F − solution. The high F − removal was attributed to the enhanced surface affinity and the formation of adequate •OH on the material. Except for carbonate and phosphate ions, other ions exhibited negligible effects and the selective removal of F − in real wastewater was high. The main mechanism of adsorption was the ligand/ion exchange and electrostatic attraction.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qing Sun,Jingsi Chen,Ziqian Zhao,Diling Yang,Yaoyu Xiao,Hao Zhang,Xin Ma,Hong Zhong,Hongbo Zeng
Stepwise separation of multi-species with a single type of chemical additives (such as surfactants) is an auspicious but challenging issue in many engineering processes as one surfactant usually lacks the ability to interact with different components. One promising strategy is to develop an environment-responsive surfactant, which possesses various functional groups to anchor target constituents under different environmental conditions. In this work, we have prepared a pH-responsive surfactant (2-(benzylthio)-acetohydroxamic acid, BTHA) possessing two pH-switchable groups (i.e., thioether and hydroxamate) that can selectively interact with different target substances, thus enabling stepwise and efficient separation of a three-component mineral system. The single in-house synthesized BTHA is successfully applied to the sequential separation of pyrite, diaspore, and kaolinite from high-sulfur bauxite by simply tuning the solution pH. Specifically, under the acidic condition (pH 6.0), the hydroxamate group of BTHA is deactivated, thus only the thioether groups can directionally interact with pyrite and enable the selective flotation recovery of pyrite to 85.9%. When the solution pH is subsequently increased to 8.0, the active hydroxamate group of BTHA can tightly chelate with diaspore and result in its efficient separation from kaolinite. The bifunctional surfactant exhibits strong and selective interactions with target substrates via pH modulation, allowing the adsorption selectivity and efficient stepwise separation, which provides an innovative paradigm for the development of novel surfactants with diverse applications in the mineral, metallurgical, chemical, and renewables recycling industry.
研究领域:
矿物加工工程
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhaoping Hou,Jian Shu,Yuanzheng Han,Liangliang Liu,Wanggang Zhang,Zhong Huang,Shaowei Zhang
This study developed a bauxite-based ceramic microfiltration membrane with a sandwich structure, featuring dual mullite-whisker separation layers surrounding a coarse-particle intermediate layer, fabricated through a simplified sieving and co-sintering process. The separation layers, derived from fine bauxite particles, formed high-aspect-ratio mullite whiskers on their surfaces, imparting superhydrophilic properties. The intermediate layer, built from coarse bauxite particles, enhanced the flow rate due to its macroporous structure. The integrated sandwich design delivered exceptional oil/water separation efficiency (96.9 %) and a high pure water flux of 669.3 L·m⁻²·h⁻¹ , balancing selectivity and permeability. The membrane also showed remarkable durability, retaining a water flux of 547.3 L·m⁻²·h⁻¹ after simple cleaning and recycling, with separation performance for emulsions of varying concentrations dropping by less than 1.5 % after 9 cycle tests. This cost-effective, scalable fabrication method highlights the potential of bauxite-based ceramic membranes for efficient and sustainable oil-in-water separation applications.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yi Li,Xianfeng Chen,Bihe Yuan,Qi Zhao,Chuyuan Huang,Lijuan Liu
A novel inhibitor of PA-MEL@NH 2 -Al 2 O 3 was synthesized by using supramolecular self-assembly technique with phytic acid (PA) and melamine (MEL) as the building blocks. Bauxite is a kind of mining waste, which is abundant in Al 2 O 3 and is used as loading matrix. By right of lotus leaf-like structure, the hygroscopicity of PA-MEL@NH 2 -Al 2 O 3 is greatly weakened. The feasibility of inhibiting CH 4 /H 2 /air explosion by different concentrations of PA-MEL@NH 2 -Al 2 O 3 was explored in a 20 L Spherical explosive vessel. The optimum inhibitory effect is obtained when the concentration is 0.25 g/L. The maximum pressure ( P max ) and maximum pressure rise rate ( (dP/dt) max ) decrease by 52.41 % and 83.50 % respectively. The induction time and the time to maximum pressure are prolonged to 193 and 400 ms, respectively. The synergistic inhibition mechanism of physics and chemistry is illustrated in the analysis of post-explosion residues. This work provides an efficient and promising approach for the suppression of CH 4 /H 2 /air explosion by synthesizing the prolonged action inhibitor with a lotus leaf-like structure.
研究领域:
材料科学
·
化学工程
·
爆炸安全
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）