Abstract The synthesis of a lanthanum hexaaluminate from the aluminum extracted from a saline slag waste is presented for the first time. Briefly, a refluxing 2 M solution of HCl is used to extract the aluminum, giving 8.9 gAl/dm3 along with other metals in lower concentrations. This solution is used to synthesize the hexaaluminate by mixing with a stoichiometric amount of lanthanum nitrate. The results showed the formation of pure phase hexaaluminate at 1473 K, as well as predominance of the hexaaluminate phase at temperatures of 1273 and 1373 K. These results also indicate that the pure hexaaluminate phase can be obtained at a much lower temperature than when commercial aluminum solutions are used improving the applications as catalyst and thermal barrier material. It was also found that the presence of other metals in solution allows the structural problems and purity of the La-hexaaluminate phase to be corrected when working with stoichiometric ratios.

中文翻译：

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含铝盐废渣合成六铝酸镧的证据：结构缺陷的修复和低温相净化

摘要 首次提出以含盐废渣中提取的铝为原料合成六铝酸镧。简而言之，使用回流的 2 M HCl 溶液提取铝，得到 8.9 gAl/dm3 以及较低浓度的其他金属。该溶液用于通过与化学计量量的硝酸镧混合来合成六铝酸盐。结果表明，在 1473 K 时形成纯相六铝酸盐，在 1273 和 1373 K 温度下六铝酸盐相占优势。这些结果还表明，与商业铝相比，可以在低得多的温度下获得纯六铝酸盐相解决方案用于改进作为催化剂和热障材料的应用。