电解锰渣-镁渣制备复合矿渣硫铝酸盐水泥熟料的研究

利用化学分析法、X射线衍射分析(XRD)、扫描电子显微镜(SEM)、热重分析(TG-DSC)等检测手段对电解锰渣、镁渣的化学组分、矿物组成、物化性能进行分析.根据分析结果,合理设计以锰渣、镁渣为原料制备硫铝酸盐水泥熟料的配比方案,并考察烧结温度对熟料性质的影响.在制备的水泥熟料中掺入一定量的石膏可制备出早强、快硬的硫铝酸盐水泥.在此过程中测定水化放热过程,并分析石膏掺量与水泥抗折和抗压强度的关系,确定最佳的石膏掺量.实验结果表明,电解锰渣、镁渣可以作为有价值的原料制备硫铝酸盐水泥熟料,两种废渣的掺比可分别达到21%,烧结过程的最佳温度为1260 ℃,保温时间为30 min,此时烧结出的试样的矿物相主要为C2S、C4A3S-.当石膏掺量为15%时,放出的水化总热最多,制备出的水泥力学性能最好,28 d的抗折强度为5.1 MPa,抗压强度为31.2 MPa,抗渗等级达到P6,烧制熟料和水化产物将锰渣和镁渣中的重金属有效的固化稳定,不易被浸出.

Preperation of Composite Slag Sulphoaluminate Cement Clinker from Electrolytic Manganese-Magnesium

The chemical and mineral composition, physical and chemical properties of electrolytic manganese slag and magnesium slag were first analyzed by chemical analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TG-DSC), respectively.Based on the analysis results, the formulas of sulphoalu minate cement clinker were rational designed using the two types of slag as part of raw materials.Then the effect of sintering temperature on the properties of the clinker was investigated.After adding gypsum into the clinker, the early strength, rapid hardening sulphoalu minate cement was formed.During the heat of hydration, the effect of gypsum content on the compressive and flexural strength of the cement were examined, and the optimum gypsum dosage can be determined.The experimental results show that the electrolytic manganese slag and magnesium slag can be used as valuable raw material for preparation of sulphoalu minate cement clinker.With the two slags of 21% and 21%, respectively, the composition of sintered clinker are mainly C2S and C4A3S-after being treated at 1260 ℃ for 30 min.The optimal mechanically properties of the prepared cement are achieved with 28 d flexural strength of 5.1 MPa and compressive strength of 31.2 MPa when 15% gypsum is added in the clinker.The impermeability grade reaches P6, and the clinker and hydration product can solidify the heavy metal effectively, which can not be leached easily.