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Polysaccharides-based pyrite depressants for green flotation separation:An overview

International Journal of mining Science and technology 2023年第10期33卷 1229-1241页

作者： A.Asimi Neisiani R.Saneie A.Mohammadzadeh D.G.Wonyen S.Chehreh Chelgani Department of mining and Metallurgical Engineering Yazd UniversityYazd 89195-741Iran Department of Materials Engineering The University of British ColumbiaVancouverBC V6T 1Z4Canada Laboratory for Strategic Materials Department of Chemical Engineering and Applied ChemistryUniversity of TorontoToronto M5S 3E5Canada Department of Material Science and Engineering(mining and Mineral Processing Engineering) African University of Science and TechnologyAbuja P.M.B 681Nigeria Minerals and Metallurgical Engineering Swedish School of MinesDept.of CivilEnvironmental and Natural Resources EngineeringLuleå University of TechnologyLuleå SE-97187Sweden

Froth flotation is an essential processing technique for upgrading low-grade *** separation would not be efficient without chemical surfactants(collectors,depressants,frothers,etc.).Depressants play a critical role in the selective separation of minerals in that they deactivate unfavorable mineral surfaces and hinder them from floating into the flotation concentration *** is the most common and challenging sulfide gangue,and its conventional depressants could be highly harmful to nature and ***,using available,affordable,eco-friendly polymers to assist or replace hazardous reagents is mandatory for a green ***-based(starch,dextrin,carboxymethyl cellulose,guar gum,etc.)polymers are one of the most used biodegradable depressant groups for pyrite *** the satisfactory flotation results obtained using these eco-friendly depressants,several gaps still need to be addressed,specifically in investigating surface interactions,adsorption mechanisms,and parameters affecting their depression *** a unique approach,this review comprehensively discussed previously conducted studies on pyrite depression with polysaccharide-based ***,practical suggestions have been provided for future assessments and developments of polysaccharide-based depressants,which pave the way to green *** robust review also explored the depression efficiency and various adsorption aspects of naturally derived depressants on the pyrite surface to create a possible universal trend for each biodegradable depressant derivative.

关键词： Green flotation Pyrite depression Eco-friendly depressants Adsorption mechanisms

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Nonlinear criterion for strength mobilization in brittle failure of rock and its extension to the tunnel scale

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International Journal of mining Science and technology 2022年第4期32卷 685-705页

作者： Rodolfo Cabezas Javier Vallejos Faculty of Engineering and technology Universidad San SebastianSantiagoChile advanced mining technology center Universidad de ChileSantiagoChile Department of mining Engineering Universidad de ChileSantiagoChile

As underground excavations are getting deeper and field stresses increase, the behavior of intact rock blocks plays an increasingly important role in understanding and estimating the overall rock mass strength. To model the brittle behavior of intact rock blocks, the stress–strain curve is usually idealized considering a linear strength mobilization approach(cohesion-weakening-friction-strengthening, CWFS),however, it is well recognized that rock presents a nonlinear behavior in terms of the confining *** study extends the strength mobilization in brittle failure of rock using nonlinear criteria. To determine the model parameters, a standard statistical method that uses the complete laboratory stress–strain curves of the intact rock is employed. Several hypotheses of linear and nonlinear models are statistically compared for different types of rock and confining stress levels. Results demonstrate that the best approach to model the brittle failure of rock is to consider a nonlinear strength envelope, such as the Hoek-Brown criterion assuming a residual uniaxial compressive strength different from zero and a mi parameter that increases, both with simultaneous mobilization. This model helps to recreate highconfining conditions and a more realistic transition between peak and post-peak strength. The obtained parameters are discussed and compared with literature values to verify the validity and to develop guidelines for the estimation of parameters, providing an objective mobilization criterion. Finally, the nonlinear model was applied to a finite element code and extended to a tunnel scale in the brittle rock under high-stress conditions. A reasonable fit between the simulations and the in-situ overbreak measurements was found.

关键词： Nonlinear strength Strength mobilization Brittle failure Intact rock Scaling

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Improving the Control Energy in Model Reference Adaptive Controllers Using Fractional Adaptive Laws

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IEEE/CAA Journal of Automatica Sinica 2016年第3期3卷 332-337页

作者： Norelys Aguila-Camacho Manuel A.Duarte-Mermoud Department of Electrical Engineering and the advanced mining technology center University of Chile IEEE

This paper presents the analysis of the control energy consumed in model reference adaptive control(MRAC)schemes using fractional adaptive laws, through simulation studies. The analysis is focused on the energy spent in the control signal represented by means of the integral of the squared control input(ISI). Also, the behavior of the integral of the squared control error(ISE) is included in the *** orders of the adaptive laws were selected by particle swarm optimization(PSO), using an objective function including the ISI and the ISE, with different weighting factors. The results show that, when ISI index is taken into account in the optimization process to determine the orders of adaptive laws,the resulting values are fractional, indicating that control energy of the scheme might be better managed if fractional adaptive laws are used.

关键词： Control energy fractional adaptive laws modelreference adaptive control

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Surface modification of Li_(3)InCl_(6)provides superior electrochemical performance for LiMn_(2)O_(4)cathode materials

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Chinese Chemical Letters 2023年第5期34卷 505-508页

作者： Yixun Gu Kuan Yang Hongbin Yao Weijian Li Haiqing Zhan Xianquan Ming Guanhan Huang Guiliang Li Feng Zhan School of Resources Environment and Materials Guangxi UniversityNanning 530004China South Manganese Group Limited Nanning 530000China

Li Mn_(2)O_(4)(LMO)is the substance of choice for small and medium-sized energy storage materials in daily *** this work,Li3InCl6(LIC)is prepared on the surface of LiMn_(2)O_(4)by hydrothermal method using InCl_(3)and LiCl as raw *** method stabilizes the LMO crystal structure by uniformly coating the LIC on the LMO surface and effectively maintains the morphology of LMO crystals during the cycling *** and EDS analysis confirm the morphology and homogeneity of the synthesized material LIC on the LMO *** prepared material is put into a battery,and the charge-discharge test is carried out at 0.5 C and 1 *** results show that the LIC surface-modified samples exhibit more than 6%higher cycling performance than the unmodified samples after long cycling.

关键词： Li-ion batteries Cathode material LiMn_(2)O_(4) Li_(3)InCl_(6) Surface modification

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