电解锰渣-镁渣制备复合矿渣硫铝酸盐水泥熟料的研究

发布时间：2018-07-26 09:08

【摘要】：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C_2S、C_4A_3S。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。
[Abstract]:The chemical composition, mineral composition and physicochemical properties of electrolytic manganese slag and magnesium slag were analyzed by means of chemical analysis, X-ray diffraction, (XRD), scanning electron microscope, (SEM), thermogravimetry (TG-DSC) and so on. According to the analysis results, the proportioning scheme of sulphoaluminate cement clinker was designed with manganese slag and magnesium slag as raw materials, and the influence of sintering temperature on clinker properties was investigated. Early strength and fast hardening sulphoaluminate cement can be prepared by adding a certain amount of gypsum into the cement clinker. In this process, the hydration exothermic process is determined, and the relationship between the gypsum content and the flexural strength and compressive strength of cement is analyzed, and the optimum gypsum content is determined. The experimental results show that electrolytic manganese slag and magnesium slag can be used as valuable raw materials to prepare sulphoaluminate cement clinker. The ratio of the two kinds of waste slag can reach 21, and the optimum sintering temperature is 1260 鈩，

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