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放热峰    
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  exothermic peak
    The secondary hydration reactor of the coal-gangue and the hydration products of cement might occur with the exothermic phenomenon. The active of coal-gangue varies,the time,the high and the total exothermic quantity of the secondary exothermic peak.
    煤矸石能够与水泥水化产物发生二次水化反应,并伴随二次放热现象,煤矸石的活性不同则二次放热峰时间、高度、总放热量均不同。
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  exothermic peak
At absorpbed dose of 5 MGy the first exothermic peak is shifted by 15-20°C; in this case, both exothermic peaks coalesce and the oxidation can be considered as single-stage process starting at 110°C.
      
DSC thermograms for the curing of C1P and C2P with benzoyl peroxide (BPO) and NMA/MTHPA showed two distinct exothermic peak positions, Tp and T1p, due to the curing of esterified fraction and epoxy groups, respectively.
      
The results show that the supported Pd catalysts have two exothermic peaks at around 312 °C and 435 °C in the DSC thermograms, respectively, while the supported Pt catalysts have one exothermic peak at approximately 345 °C.
      
Using DSC, the exothermic peak due to precipitation from the supersaturated α-Al matrix was observed in the range of 200-250°C during continuous heating of atomized powder, and the size of the peaks increased with decreasing powder size.
      
Metastable phase with structure type of sigma phase (e.g., in Fe-Cr alloys) was observed in melt spun ribbons by rapid heating or annealing at temperatures below the first exothermic peak of DTA curve.
      
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  exothermic peaks
In the derivatograms of the anion exchanger in the nitrate form there are one endothermic and two exothermic peaks (~100, 160-180, and 200-220°C).
      
At absorpbed dose of 5 MGy the first exothermic peak is shifted by 15-20°C; in this case, both exothermic peaks coalesce and the oxidation can be considered as single-stage process starting at 110°C.
      
The homogeneity of the product is correlated with the temperature of exothermic peaks above 1100 K due to the crystallization of MgTiO3, but not with the endothermic peaks around 650 K.
      
During the thermal analysis, the cross-linked co-polymers exhibited two exothermic peaks and one endothermic peak, indicating the presence of HTPB and GAP polymeric chain segments in the co-polymers.
      
During the baking of the dry-gel powder, two exothermic peaks occur, followed by the formation of Li2O and Co3O4 and then the combination of LiCoO2, which is testified by DTA and XRD.
      
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  exothermal peak
The Raman spectra of Li2O · 7GeO2 glasses, which are heat treated under different conditions at temperatures near the temperature corresponding to the first exothermal peak in the DTA curve, are measured in the frequency range 20-1100 cm-1.
      
We have found that there is an exothermal peak on the DTA curve of nanostructured γ-Fe2O3 sample and that this peak is not repeatable.
      
The XRD microstructure analysis confirms for the first time that this exothermal peak corresponds to the structural phase transition from γ-Fe2O3 to α-Fe2O3.
      
The DTA curve showed that boric acid treated basswood has an exothermal peak at 420°C, indicating the exothermal polymerization reaction of charring.
      
DSC data show that prolonged exposure to UV light and post-thermal treatment can decrease the Tonset and Tpeak of the exothermal peak and the condensation temperature between TiOH, and increase ΔH of the exothermal peak.
      
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  其他


he changes in physical chemical properties of pyrite mechanically activated in a vibra-tion mill were studied.The exothermic effect on the DTA curve for non-activated pyrite inair is correspondent to the oxidation of pyrite to sulphate。In comparison to non-activatedsample,the temperature for exothermic effect decrease with incresing activation time。In ad-dition,two new exothermic effects appear on the DTA curves for activated samples。X-rayanalysis declares that the lattice constant increase from 5.4174 to 5.4244...

he changes in physical chemical properties of pyrite mechanically activated in a vibra-tion mill were studied.The exothermic effect on the DTA curve for non-activated pyrite inair is correspondent to the oxidation of pyrite to sulphate。In comparison to non-activatedsample,the temperature for exothermic effect decrease with incresing activation time。In ad-dition,two new exothermic effects appear on the DTA curves for activated samples。X-rayanalysis declares that the lattice constant increase from 5.4174 to 5.4244 after mechan-icallv activated for 40 min。Mechanical activation has greatly enhanced the leaching processof pyrite in nitric acid. The activation energy decreases from 69 kJ/mol to 48 kJ/mol afteractivation。 The leaching rate becomes less dependent on temperature。

研究了黄铁矿在振动磨中机械活化后的物理化学性质变化。黄铁矿经机械活化后,其DTA曲线上氧化放热岭的峰位前移,并且出现了两个新的放热峰,这两个新峰的强度随着活几时间的延长而不断增加;机械活化后,黄铁矿的晶格常数增加;机械活化还使黄铁矿与硝醚的反应能力增强,可以在低的硝酸浓度、低的浸出温度和短的浸出时间下得到高的浸出率。经振动磨活化40min,黄铁矿与硝酸反应的活化能就可由未活化时的69KJ/mol降至活化后的48KJ/mol。

The TG/DTA profiles of coal series kaolinite under different atmosphere were obtained by employing the TemperatureProgrammed ThermoGravimetry method Comparison of the TG/DTA profiles of coal series kaolinite and kaolin clay show that the TG/DTA curves of coal series kaolinite in N 2 atmosphere are basically the same as that of kaolin clay However, the TG/DTA curves of coal series kaolinite in air have distinguished features: the endothermic peak of dehydroxylation partly or completely overlaps with the...

The TG/DTA profiles of coal series kaolinite under different atmosphere were obtained by employing the TemperatureProgrammed ThermoGravimetry method Comparison of the TG/DTA profiles of coal series kaolinite and kaolin clay show that the TG/DTA curves of coal series kaolinite in N 2 atmosphere are basically the same as that of kaolin clay However, the TG/DTA curves of coal series kaolinite in air have distinguished features: the endothermic peak of dehydroxylation partly or completely overlaps with the exothemic peak of coal combustion, and the weaker exothermic peak around 300℃ is also from coal combustion Based on the analyses of the endothermic peak of dehydroxylation, it is verified that the structural completeness and crystallinity of coal series kaolinite are inferior to that of kaolin clay

利用程序升温热分析法得到煤系高岭土在不同气氛下的TG/DTA谱图。通过比较煤系高岭土与普通高岭土的TG/DTA谱图,可以发现:在惰性气氛下煤系高岭土的DTA谱图与普通高岭土的谱图基本一致;而在空气气氛下,由于煤的燃烧反应致使煤系高岭土的吸热谷被部分或全部遮盖,另外在300℃左右有弱的放热峰出现。比较煤系高岭土与普通高岭土的吸热谷特征可以得出煤系高岭土的结构完整性与结晶度较差。

In both of the pure cement system and the mixed system of activated Xuzhou coal-gangue and cement,hydration products at different curing age as well as the hydration heat and the kinetics process of the hydration reactor were studied.The results show that the content of calcium hydroxide was the highest in activated coal-gangue-cement system when the hydration reactor had run for 3 days,after 3 days calcium hydroxide could be gradually reduced with the curing age.Apart from calcium hydroxide,the composites of...

In both of the pure cement system and the mixed system of activated Xuzhou coal-gangue and cement,hydration products at different curing age as well as the hydration heat and the kinetics process of the hydration reactor were studied.The results show that the content of calcium hydroxide was the highest in activated coal-gangue-cement system when the hydration reactor had run for 3 days,after 3 days calcium hydroxide could be gradually reduced with the curing age.Apart from calcium hydroxide,the composites of reactants and the hydration products of activated coal-gangue-cement system was the similar as the pure cement system.The secondary hydration reactor of the coal-gangue and the hydration products of cement might occur with the exothermic phenomenon.The active of coal-gangue varies,the time,the high and the total exothermic quantity of the secondary exothermic peak.The hydrated speed and the exothermic quantity could be enhanced the coal-gangue-cement system by the excitant,and the secondary hydration reactor could be also advanced.

选取徐州地区活化煤矸石—水泥混合体,研究不同龄期的水化产物及水化反应热力学过程、水化反应动力学过程,以探明活化煤矸石对水泥的水化作用。结果表明,在活化煤矸石—水泥体系中,水化3 d时的氢氧化钙含量最多,而后随龄期增加而逐渐减少;除氢氧化钙外,水泥组成矿物和其他水化产物的成分及其随龄期的变化与纯水泥体系类似。煤矸石能够与水泥水化产物发生二次水化反应,并伴随二次放热现象,煤矸石的活性不同则二次放热峰时间、高度、总放热量均不同。激发剂能够提高煤矸石—水泥混合体系的水化速率及水化放热量,并能够促进二次水化反应,进而活化煤矸石—水泥体系。

 
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