Use of eggshell as an alternative source of calcium to obtain calcium titanate (CaTiO3)

ABSTRACT We describe the study of the re-utilization of egg shell as an alternative mineral source of calcite in the synthesis of calcium titanate (CaTiO3). The raw materials were characterized by X-ray diffraction and X-ray fluorescence; compositions were formulated and sintered under different conditions. After sintering the crystalline phases formed were quantified by the Rietvield (MR) method, analyzes of apparent density (DA), impedance spectroscopy (EIA) and scanning electron microscopy (SEM) were performed. The results reveal the possibility of using the egg shell residue as a source of calcium for the formation of calcium titanate with perovskite structure, it is fundamental to consider studies of technical and economic viability are also developed so that possible applications of interest are feasible.摘要 本研究探讨以蛋壳作为方解石（calcite）的替代矿物源，用于合成钛酸钙（CaTiO3）的资源化再利用路径。研究团队首先通过X射线衍射（X-ray diffraction）与X射线荧光光谱法（X-ray fluorescence）对原料进行表征，随后配制配料组分，并在不同工艺条件下开展烧结实验。烧结完成后，采用里特维尔德（Rietveld）法定量分析生成的晶相，同时开展表观密度（apparent density, DA）、阻抗谱（impedance spectroscopy, EIA）以及扫描电子显微镜（scanning electron microscopy, SEM）表征测试。研究结果表明，可利用蛋壳残渣作为钙源合成具备钙钛矿结构的钛酸钙；为推动该材料的潜在应用落地，开展技术与经济可行性相关研究具备重要意义。