【摘要】 机械力化学法能够提升超细粉煤灰的活性,使其在弱碱下具有较好的激发潜力。本实验研究了弱碱电石渣对超细化粉煤灰（D50=2. 5μm）激发产物的影响规律,并与氢氧化钠激发进行比较。通过X射线衍射（XRD）仪、透射电子显微镜（TEM）、电感耦合等离子体发射光谱（ICP）仪和固体核磁共振（NMR）仪分别分析了不同碱性物质激发下粉煤灰水化产物的物相组成、体系中离子的溶出特性以及粉煤灰中玻璃相的聚合度变化情况。结果表明,超细粉煤灰在湿法研磨过程（6 h）中已经发生了早期水化反应,表现为明显的钙矾石和Ca₂Al（OH）₇·3H₂O产物峰。XRD、TEM和ICP测试结果显示超细粉煤灰在电石渣激发下水化产物种类增多,结构致密;在NaOH激发下超细粉煤灰产生了沸石类产物,钙矾石类水化产物较少。NMR测试结果显示,粉煤灰中硅氧多面体网络结构由高聚态向低聚态转变,结构中较多的活性成分被激发并参与了早期的水化反应。更多还原

【Abstract】 Mechanochemistry can enhance the activity of ultra-fine fly ash and endows it with better activation potential in weak alkalis. The impact of calcium carbide slag on the activation products of ultra-fine fly ash（ D50= 2. 5 μm） was studied,and the activation products of sodium hydroxide were taken into comparison. Specifically,the phase composition of hydration products of the fly ash activated by different matters,the dissolution characteristics of ions in the system and the variation of the polymerization degree of the glass phase in the fly ash were tested and analyzed by means of XRD,TEM,ICP and NMR. It could be found from the results that early hydration reaction of ultra-fine fly ash had occurred in the wet grinding process（ 6 h）,reflected by obvious product peaks of ettringite and hydrocalumite（ Ca₂ Al（ OH）₇·3 H₂ O） in XRD patterns. The results of XRD,TEM and ICP analyses indicated the increase in diversity of the hydration products of ultra-fine fly ash activated by calcium carbide slag,as well as the dense structure of the products. Under the activation of NaOH,zeolites products were generated from ultra-fine fly ash,accompanied by less ettringite hydration products. The results of NMR test showed that the structure of the silica polyhedron network in fly ash varied from high poly state to low poly state. More active ingredients in the system were activated and participated in the early hydration reaction.更多还原