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Behavior of silicon-containing minerals during Bayer digestion

Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 1-9页

作者：赵清杰杨巧芳陈启元尹周澜吴争平殷振国 Zhengzhou Research Institute Aluminum Corporation of China Limited School of Chemistry and Chemical Engineering Central South University Shenzhen Herewin Technology Co. Ltd

Digestion behaviors of several single silicon-containing minerals including kaolinite, illite and pyrophyllite in aluminate solution were investigated. The result shows that the digestion rates of kaolinite, illite and pyrophyllite in aluminate solution were influenced by reaction conditions such as temperature. Adopting quantum chemistry theoretical calculation, using CASTEM procedure module, the slab model of kaolinite, illite, pyrophyllite and their ordinary complete cleavage plane (001) were geometry optimized at GGA-PW91 level. The micro-essence of the different reaction activities among kaolinite, illite, pyrophyllite in aluminate solution was opened out. It is found that the reaction activities of kaolinite, illite, pyrophyllite are obviously different and the reaction activity of pyrophyllite is the highest. The Si—O bond strength of illite is the strongest and its Al—O bond strength is comparatively the weakest, so Si in it is the most difficult to be removed. The Si—O bond strength of pyrophyllite is the weakest, so Si in it is relatively easy to be removed. The micro-electron structure of complete cleavage plane and the Si—O bond strength of kaolinite, illite and pyrophyllite are evidently influenced by the existence of OH-, of which the surface character and the reduction of Si—O bond strength of kaolinite are influenced most greatly by OH-. Therefore, the desilication of kaolinite in alkaline solution at relatively low temperature is easier.

关键词： silicon minerals alumina Bayer digestion aluminate solution reaction activity behavior

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Hazard evaluation of ignition sensitivity and explosion severity for three typical MH_(2) (M=Mg,Ti,Zr)of energetic materials

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Defence Technology（防务技术） 2021年第4期17卷 1262-1268页

作者： Xing-liang Wu Sen Xu Ai-min Pang Wei-guo Cao Da-bin Liu Xin-yu Zhu Fei-yang Xu Xu Wang School of Chemical Engineering Nanjing University of Science and TechnologyNanjingJiangsu210094PR China Science and Technology on Aerospace Chemical Power Laboratory Hubei Institute of Aerospace ChemotechnologyXiangyang441003PR China School of Environmental and Safety Engineering North University of ChinaTaiyuan030051ShanxiPR China

MgH_(2),TiH_(2),and ZrH_(2) are three typical metal hydrides that have been gradually applied to composite explosives and propellants as additives in recent *** evaluate ignition sensitivity and explosion severity,the Hartmann device and spherical pressure vessel were used to test ignition energy and explosion pressure,*** results showed that the ignition sensitivity of ZrH_(2),TiH_(2) and MgH_(2) gradually *** the concentration of MgH_(2) is 83.0 g/m^(3) in Hartmann device,the ignition energy attained a minimum of 10.0 *** explosion pressure of MgH_(2) were 1.44 times and 1.76 times that of TiH_(2) and ZrH_(2),respectively,and the explosion pressure rising rate were 3.97 times and 9.96 times that of TiH_(2) and ZrH_(2),respectively,through the spherical pressure *** indicated that the reaction reactivity and reaction rate of MgH_(2) were higher than that of TiH_(2) and ZrH_(2).In addition,to conduct in edepth theoretical analysis of ignition sensitivity and explosion severity,gas production and combustion heat per unit mass of ZrH_(2),TiH_(2) and MgH_(2) were tested by mercury manometer and oxygen bomb *** experimental results revealed that MgH_(2) had a relatively high gas production per unit mass(5.15 mL/g),while TiH_(2) and ZrH_(2) both had a gas production of less than 2.0 mL/*** thermal stability gradually increased,leading to a gradual increase in ignition ***,compared with theoretical combustion heat,the combustion ratio of MgH_(2),TiH_(2) and ZrH_(2) was more than 96.0%,with combustion heat value of 29.96,20.94 and 12.22 MJ/kg,respectively,which was consistent with the explosion pressure and explosion severity test results.

关键词： Ignition energy Explosion pressure reaction activity Combustion heat

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Application of Fe-Based Amorphous Alloy in Industrial Wastewater Treatment:A Review

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Journal of Renewable Materials 2022年第4期10卷 969-991页

作者： Liefei Pei Xiangyun Zhang Zizhou Yuan School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou730050China

Amorphous alloy(MGs)is a solid alloy with disordered atomic accumulation obtained by ultra-rapid solidification of alloy *** atom deviates from the equilibrium position and is in metastable *** to now,a large number of MGs have been applied to the treatment of dye and heavy metal contaminated wastewater and ideal experimental results have been ***,there is no literature to systematically summarize the chemical reaction and degradation mechanism in the process of *** the basis of reviewing the classification,application,and synthesis of MGs,this paper introduces in detail the chemical reactions such as decolorization,mineralization,and ion leaching of Fe-based amorphous alloy(Fe-MGs)in the degradation of organic and inorganic salt wastewater through direct reduction or advanced oxidation *** with crystalline materials,the higher reaction rate of Fe-MGs can be attributed to lower activation energy,negative redox potential,loose product layer,and band structure with downward shift of valence band ***,some suggestions and prospects are put forward for the limitations and research prospects of MGs in the environmental field,which provides a new idea for the synthesis of new environmental functional materials.

关键词： Amorphous alloy industrial waste water direct reduction advanced oxidation reaction activity

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Effect of Copper Content on the Direct Process of Organosilane Synthesis from Silicon and Methyl Chloride

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Tsinghua Science and Technology 2006年第2期11卷 252-258页

作者：罗务习张国良王光润王金福 Department of Chemical Engineering Tsinghua University Beijing 100084 China Jilin Chemical Corporation Jilin 132022 China

The effect of copper concentration on the performance of the catalytic reaction between silicon and methyl chloride was investigated using online gas chromatogram. The catalyst concentration greatly influences various aspects of the direct organosilane synthesis process, including the reaction rate, the selec- tivity, and the silicon conversion. The reaction activity and the silicon conversion increase as the catalyst concentration increases. However, the reaction selectivity decreases for the catalyst concentrations more .than 9 wt.%. The cross-sections of deactivated contact mass particles were observed by optical microscopy and analyzed by scanning electron microscope combined with energy dispersive X-ray detector （SEM-EDX） The observations showed that a textured substance formed on the original flat surface of the silicon particles after deactivation with copper only in a shallow surface layer of the contact mass. This indicates that the copper diffusion is the rate limiting step which causes the reaction deactivation.

关键词： direct process copper concentration reaction activity reaction selectivity silicon conversion online gas chromatogram (GC) scanning electron microscope combined with energy disper-sive X-ray detector (SEM-EDX)

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The Capture of ·H and ·OH Radicals by Vitamin C and Implications for the New Source for the Formation of the Anion Free Radical

The Capture of ·H and ·OH Radicals by Vitamin C and Implic...

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中国化学会第27届学术年会

作者：李平 School of Chemistry and Chemical Engineering Qufu Normal University

＜正＞To gain a better understanding of the more accurate reaction profile of the antioxidation behaviors of vitamin C, the reactions between vitamin C （monoanionic form, AAH-） and two radicals, ·H and

关键词： Vitamin C reaction activity Concerted proton-electron transfer (CPET) mechanisms

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