This study provides insight into benefits of thermo-chemical conversion of coal slag as recovery process into value-added products. This research involves kinetic analysis of process conducted through non-isothermal thermal analysis measurements, with additional raw material characterization. Kinetic results showed that decomposition proceeds through two consecutive reactions steps (first one, including anorthite 1̅ → 1̅ phase transition, and then production of incongruent melting product (ternary system: CaO·AlO·2SiO (CAS), where viscosity of slag changes), and second one including dehydration and formation of meta-muscovite, and subsequently, thermal disruption of muscovite de-hydroxylated phase, which proceeds with breaking of octahedral Al–O bonds), and one single-step reaction (attributed to CO-reduction of hematite to magnetite). Thermodynamic results showed an existence of physically meaningful isokinetic temperature (), which corresponds to active vibrational frequency of surroundings of SiO reaction site, manifested through Si‒O bond weakening by catalytic reaction of freed hydroxide ion (OH). It was concluded that at temperature = , the course of process loses its dependence on temperature and pressure, regulating changes between thermodynamic parameters, through enthalpy-entropy compensation (EEC) effect.

中文翻译：

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利用非等温动力学测量数据对煤渣热分解中的焓和熵收敛问题的新见解


这项研究深入了解了煤渣热化学转化作为增值产品回收过程的好处。这项研究涉及通过非等温热分析测量进行的过程动力学分析，以及额外的原材料表征。动力学结果表明，分解通过两个连续的反应步骤进行（第一个反应步骤包括钙长石1̅→1̅相变，然后产生不一致的熔融产物（三元体系：CaO·AlO·2SiO（CAS），其中炉渣的粘度发生变化），第二个包括脱水和形成偏白云母，随后对白云母脱羟基相进行热破坏，进而破坏八面体 Al-O 键），以及一个单步反应（归因于赤铁矿的 CO 还原）磁铁矿）。热力学结果表明存在物理意义的等速温度（），它对应于SiO反应位点周围的活跃振动频率，通过游离氢氧根离子（OH）的催化反应削弱Si-O键来体现。结论是，当温度= 时，过程过程失去对温度和压力的依赖，通过熵补偿（EEC）效应调节热力学参数之间的变化。