煤粉炉联产水泥熟料Q相矿物形成机制研究

选用分析纯CaO、SiO2、Al2O3和MgO为实验原料,首先在实验室高温电阻炉炉内开展了单矿物2CaO.Al2O3.SiO2转变为Q相矿物的反应机制实验研究.对获得的熟料样品分别进行XRD、SEM和EDS图谱分析,实验结果表明单矿物2CaO.Al2O3.SiO2能与适量的CaO、MgO反应生成具有良好水化活性的Q相矿物.选取低硫兖州煤和高硫长广煤为实验煤种,在两段多相反应实验台上进行联产水泥熟料过程Q相矿物的生成实验,对所得熟料进行矿物组成X射线衍射分析,结果表明低硫兖州煤和高硫长广煤联产水泥熟料,当混合煤粉中添加适量的CaO、MgO时,联产熟料中有Q相矿物的生成,联产过程中Q相矿物的生成机制与单矿物2CaO.Al2O3.SiO2转化为Q相矿物的反应机制相一致.

Formation Mechanism of Q-phase of Cement Clinker Cogeneration in Pulverized Coal Combustion Boilers

Analytical pure CaO, SiO2, Al2O3 and MgO were selected as experimental materials and experiments of transform of pure mineral of 2CaO.Al2O3.SiO2 into Q phase were conducted on high- temperature box-type resistance furnace. The collected clinker samples were analyzed by XRD, SEM and EDS, respectively. The results showed that pure 2CaO.Al2O3.SiO2 with suitable content CaO and MgO could produce Q phase of better hydration performance. Low-sulphur Yanzhou coal and high-sulphur Changguang coal were selected as experimental coals, experiments of formation of Q phase in the process of cement clinker cogeneration were performed on two-stage polyphase reaction setup. The collected clinker samples were measured by XRD. The results showed when coal powder were mixed with certain content CaO and MgO, Q phase mineral appeared in cogeneration cement clinker. The formation mechanism of Q phase in the process of cement cogeneration accorded with that of transform of pure 2CaO.Al2O3.SiO2 into Q phase.