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Surface chemistry of activation of lime-depressed pyrite in flotation

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中国有色金属学会会刊：英文版 2000年第6期10卷 798-803页

作者：胡岳华章顺力邱冠周 Cent S univ Dept Mineral Engn Changsha 410083 Peoples R China univ utah Dept Met Engn Salt Lake City UT 84112 USA

The depression of pyrite by lime is attributed to the surface formation of Ca(OH) 2, CaSO 4 and Fe(OH) 3 as determined by XPS analysis. Xanthate flotation tests show that oxalic acid and other organic acids, as well as sulphuric acid and other inorganic acids and their salts can restore xanthate flotation of pyrite after depression by lime. In terms of XPS analysis, solution chemistry calculations and electrochemical measurements, it is evident that these chemicals act as activators to reduce pulp pH, prevent further oxidation of pyrite, and dissolve surface calcium or iron species to create a fresh surface. Activation efficiency was quantitatively discussed based on an activation index related to the polar group functionality of the activators. The results for activation flotation of pyrite are very well explained using the activation index. Oxalic acid which exhibited the greatest activation index can be substituted for sulfuric acid, which may solve potential environmental and maintenance problems associated with calcification/scaling reaction expected with sulfuric acid.[

关键词： pyrite surface chemistry activation flotatio

Aggregation/dispersion of ultrafine silica in flotagent solution

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中国有色金属学会会刊：英文版 2001年第5期11卷 768-773页

作者：胡岳华邱冠周 Cent S univ Dept Mineral Engn Changsha 410083 Peoples R China univ utah Dept Met Engn Salt Lake City UT 84112 USA

The aggregation/dispersion of ultrafine particles is of interest for both fundamental and practical perspective. These behaviors of ultrafine silica in flotagent solution and the heter coagulation of silica and alumina were examined using particle size analyzer, electrokinetic potential, contact angle measurements. The flotation reagents have a pronounced effect on the aggregation or dispersion behaviors of ultrafine silica suspensions. Collector dodecylamine chloride renders silica surfaces hydrophobic and the aggregation between silica particles takes place. Modifier tripolyphosphate makes the silica surface completely hydrophilic and enhances the stability of silica suspension. These experimental results can be explained based on the extended DLVO theory by considering polar interfacial interaction between particle surfaces.

关键词： aggregation dispersion silica flotagent polar interfacial interaction

Preliminary examination of electrochemical and spectroscopic features of trithiocarbonate collectors for sulfide mineral flotation

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中国有色金属学会会刊：英文版 2000年第S1期10卷 12-18页

作者： R. Du Plessis 1, J.D. Miller 1, J.C.Davidtz 2 1. Department of Metallurgical Engineering, university of utah, Salt Lake City, utah 84102, USA 2. Department of Materials Science and Metallurgical Engineering, university of Pretoria, Pretoria 0002 univ utah Dept Met Engn Salt Lake City UT 84102 USA univ Pretoria Dept Met Engn & Mat Sci ZA-0002 Pretoria South Africa

The redox potentials of xanthate/dixanthogen (dithiocarbonate/di dithiocarbonate, DTC/(DTC) 2) and trithiocarbonate/di trithiocarbonate (TTC/(TTC) 2) couples have been measured for the potassium salts. The spectroscopic characteristics of these sulfide mineral collectors were determined by FTIR and UV analysis. Electrochemically controlled contact angle measurements at a pyrite surface provided the basis to analyze the effect of the functional group ( O CS 2 versus S CS 2) on the hydrophobic surface state. Results from this preliminary examination are discussed with respect to the nature of collector adsorption and the pyrite flotation response.

关键词： redox potential trithiocarbonate collector sulfide mineral flotation

Simulation of Dynamic 3D Crack Propagation within the Material Point Method

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Computer Modeling in Engineering & Sciences 2017年第4期113卷 389-410页

作者： Y.J.Guo J.A.Nairn univ.of utah Salt Lake CityUT 84112USA2119 Hillside Oak LnHoustonTX 77062USA Wood Science&Engineering Oregon State UniversityCorvallisOR 97330USA

This paper presents the principles and algorithms for simulation of dynamic crack propagation in elastic bodies by the material point method(MPM),from relatively simple two-dimensional cases to full three-dimensional,mixed-mode crack *** paper is intended to give a summary of the latest achievements on simulation of three-dimensional dynamic crack propagation,which is essentially an unexplored *** of the methodology presented in this paper to several dynamic crack propagation problems has shown that the MPM is a reliable and powerful approach for simulating three-dimensional,mixed-mode crack propagation.

关键词： Material point method (MPM) dynamic fracture crack propagation threedimensional cracks mixed-mode

Thermal Properties of PHB/PEG Blends

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Journal of Materials Science & Technology 1998年第1期14卷 95-96页

作者： Zhang, QQ Zhang, Y Wang, FJ Liu, LR Wang, C Chinese Acad Med Sci Inst Biomat Engn Tianjin 300192 Peoples R China Peking Union Med Coll Tianjin 300192 Peoples R China univ utah Salt Lake City UT 84112 USA

Thermal properties of PHB and PHB/PEG blends were investigated by differential scanning calorimetry (DSC) and melt index (MI) test. DSC thermograms indicate that two components of blend are miscible. From the DSC thermogram, we can also conclude that the melting point of PHB descends with the increased content of PEG, this can improve PHB processing properties. From MI data, we may draw the same conclusion.

关键词： Polyesters

Translational machinery and translation regulation in axon regeneration

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Neural Regeneration Research 2025年第5期20卷 1392-1394页

作者： Homaira Nawabi Stephane Belin univ.Grenoble Alpes InsermU1216Grenoble Institut NeurosciencesGrenobleFrance

Over the centuries,the regeneration field has been puzzled by the dual response of the central nervous system(CNS-brain,spinal cord,cranial nervesⅠandⅡ)and the peripheral nervous system(PNS that refers to all the nerves that innervate muscles,skin,organs,bones among others).Even Ramon y Cajal had noticed that an injury to the PNS often leads to axon regrowth,in contrast to the CNS.

关键词： nerves organs muscles

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各向异性地震数据的走时反演

各向异性地震数据的走时反演

Aspects of syringeal mechanics in avian phonation

美国勘探地球物理学家学会第62届年会

作者： Fuhao Qin Yi Luo Wenying Cai 戴铭藻 univ．of utah Chevron Exploration univ．of utah

本文提出一种用走时数据反演各向异性速度的方法。该方法适用于任何类型的备向异性介质。一些数值试验表明,该新方法比起各向异性数据用各向同性反演来有明显的改进。

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Aspects of syringeal mechanics in avian phonation

Deciphering the mechanobiology of microglia in traumatic brain injury with advanced microsystems

23rd International Ornithological Congress

作者： Ole N.Larsen Franz Goller Johan L.van Leeuwen Centre for Sound Communication SDU Odense Univ. DK-5230 Odense Dept. of Biology Univ. of Utah Salt Lake City Utah 84112 USA Dept. of Animal Sciences Wageningen Univ. NL-6709 PG Wageningen The Netherlands

＜正＞ The vocal organ of birds, the syrinx, is formed by modified cartilages of the trachea and/or bronchi and a number of muscles. The syrinx is relatively inaccessible. Although its anatomy, innervation, muscular control, and driving air flow are well described in some species, the biomechanics of phonation are still poorly understood. Recently, the use of very thin, flexible endoscopes has supported prior speculations on syringeal muscle mechanics, since abduction, adduction, rotation, and tensing of syringeal structures in response to

关键词： syrinx endoscopy biomechanics modelling

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Neural Regeneration Research 2025年第8期20卷 2304-2306页

作者： Anthony Procès Sylvain Gabriele univ.Grenoble Alpes InsermU1216Grenoble Institut des NeurosciencesGrenobleFrance Mechanobiology&Biomaterials Group CIRMAPResearch Institute for BiosciencesUniversity of MonsMonsBelgium

Advanced microsystems in traumatic brain injury research:Traumatic brain injury(TBI)results from a mechanical insult to the brain,leading to neuronal and axonal damage and subsequently causing a secondary *** minutes ... 详细信息

关键词： traumatic injury damage