Effect of preparation process on purity of tricalcium aluminate

S. Ravaszová, Karel Dvořák, Andrea Jančíková
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Abstract

In the realm of cement production, traditional fuels are steadily giving way to alternative sources. While this shift yields economic and ecological advantages, it introduces notable technological challenges. Specifically, there is an escalation in certain chemical elements, leading to variability in the mineralogical composition. This variability is subsequently manifested in the characteristics of Portland clinker. It becomes imperative, therefore, to synthesize pure clinker minerals. This synthesis is essential for both understanding their behavior in industrially manufactured cement and creating analytical standards for mineral identification through XRD. The primary focus of the research is on the production of pure tricalcium aluminate, a key clinker mineral, within laboratory conditions. A direct laboratory methodology involving solid-phase synthesis is used. The investigation meticulously tracks the impact of homogenizing the raw material mixture on the resultant mineral’s purity. To achieve this, a high-speed Pulverisette 6 planetary mill is utilized along with two types of grinding bodies. A corundum grinding capsule with corundum grinding bodies is employed to prevent contamination by foreign ions. Simultaneously, a highly efficient steel grinding capsule with steel grinding bodies is utilized. The raw material mixture is then subjected to sintering at six different temperatures ranging from 1 200 to 1 450 °C, and the purity of the produced mineral is quantified using Rietveld analysis. Laser granulometry results indicate a strikingly similar comminution of the raw material in both grinding cases. Iron contamination, as revealed by XRF analysis, is minimal, accounting for only 0.21 %. The purity of 97.6% C3A, is achieved at 1 450 °C using a steel grinding capsule, with 2.4% unreacted lime Conversely, when using a corundum capsule, a purity of 93.6 % is achieved, accompanied by residues of 2.2 % mayenite and 3.8 % lime. This discrepancy may be attributed to an insufficient degree of raw material comminution in the corundum capsule. Intriguingly, a slight iron contamination during the grinding of the raw material mixture exerts a positive influence on purity. In this case, iron acts as a flux, fostering a more favorable reaction of the mineral mayenite. This multifaceted exploration enhances our understanding of clinker mineral synthesis, offering insights into optimizing purity based on grinding methods, sintering temperatures, and the impact of minor contaminants.
制备工艺对铝酸三钙纯度的影响
在水泥生产领域,传统燃料正逐步让位于替代能源。这种转变在带来经济和生态优势的同时,也带来了显著的技术挑战。具体来说,某些化学元素的增加导致矿物成分的变化。这种变化随之表现在波特兰熟料的特性上。因此,合成纯净的熟料矿物变得势在必行。这种合成对于了解它们在工业化生产的水泥中的行为以及通过 XRD 建立矿物鉴定的分析标准至关重要。研究的主要重点是在实验室条件下生产纯铝酸三钙(一种关键的熟料矿物)。研究采用了固相合成的直接实验室方法。调查细致地跟踪了原料混合物均化对所得矿物纯度的影响。为此,使用了高速 Pulverisette 6 行星研磨机和两种研磨体。采用刚玉研磨囊和刚玉研磨体,以防止外来离子的污染。同时,还使用了带有钢研磨体的高效钢研磨囊。然后将原料混合物在 1 200 至 1 450 °C 的六个不同温度下进行烧结,并使用里特维尔德分析法对所生产矿物的纯度进行量化。激光粒度仪的结果表明,两种研磨情况下原料的粉碎程度惊人地相似。XRF 分析显示,铁污染极少,仅占 0.21%。相反,当使用刚玉研磨囊时,纯度为 93.6%,同时残留 2.2% 的麦饭石和 3.8% 的石灰。造成这种差异的原因可能是刚玉胶囊对原材料的粉碎程度不够。有趣的是,在原料混合物的研磨过程中,轻微的铁污染会对纯度产生积极影响。在这种情况下,铁起到了助熔剂的作用,促使矿物 mayenite 发生更有利的反应。这一多方面的探索加深了我们对熟料矿物合成的理解,为根据研磨方法、烧结温度和轻微污染物的影响来优化纯度提供了启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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