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Apparent activation energy for spontaneous combustion of sulfide concentrates in storage yard YANG Fu-qiang1, 2, WU Chao1, 2, CUI Yan1, 2, LU Guang1, 2 1. School of Resources and Safety...; the apparent activation energy values change from 36 to 160 kJ/mol in different temperature ranges; sulfur-rich sulfide and iron sulfide concentrates have lower apparent activation energy than copper......
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is an important part of the output electric quantity. Key words: sphalerite mineral; electro-generative leaching; bio-oxidation; activation energy ... technique. 3.2 Activation energy of electro-generative leaching for sphalerite As mentioned above, the five temperature points of A. ferrooxidans, 299, 301, 303, 305 and 307 K were favored. The effect......
)0.37-O6.43 glass. The first crystallization reaction occurs at 1223-1273K and the tetragonal zirconia oxide forms, the crystallization activation energy is 518-538kJ/mol. The second crystallization reaction occurs at 1423-1473K. The main phases precipitated are mullite and cristobalite, the crystallization activation energy is 522-545kJ/mol. The zirconia oxide existence can decrease the crystallization......
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to conventional calcination in the activation pathway of kaolin. It is attributed to microwave heating relying on objects to absorb microwave energy and convert it into thermal energy, which can... J. Cent. South Univ. (2020) 27: 2494-2506 DOI: https://doi.org/10.1007/s11771-020-4475-y Comparison of microwave and conventional heating routes for kaolin thermal activation ZHANG Liang-jing(张良静)1......
of scheelite was studied, and the corresponding kinetic equations were established. The results indicate that the obtained apparent activation energy with or without ultrasound is same 72 kJ/mol, and both... and elimination of product layer, corresponding to the transformation of kinetic controlling step from diffusion controlling step and reduction of apparent activation energy. For the one without compact product......
THE MECHANISM FOR NANOMETER-SIZED TiC SYNTHESIZING BY MECHANICAL & THERMAL ACTIVATION PROCESSING T.Sun1,L.S. Cui2,X.L. Cui1,M.Zhu1 (1.College of Mechanical Engineering, South China University..., named mechanical & thermal activation processing, is discussed in the present paper. It is a processing based on thermal activation in liquid phase (molten salt) after mechanical activation......
, which led to the formation of nano-intermetallic crystals in amorphous matrix. The apparent activation energy for the crystallization of the alloy, determined by the Kissinger equation, was relatively high (468 kJ/mol), indicating that this amorphous alloy has high thermal stability. Changes in the activation energy during the crystallization process, were also evaluated by iso-conversional......
, reacting system is a non-constant temperature process. The leaching ratio is controlled by chemical reaction. The apparent activation energy is about 40kJ/mol. Microwave increases the frequency factor of reaction with the microwave power increasing, while the apparent activation energy of reaction has hardly been changed, which macroscopically demonstrates that the increase of the microwave power......
