The current study investigates sericite clay as an alternative source of potash and alumina. The alumina and potash content in the sericite is approximately 35 and 10%, respectively, compared with 50–55% in bauxite ore. Muscovite and illite phases are stable, and direct leaching is found to be ineffective. Here, planetary ball milling was performed, which provided dissociation of stable phases to relatively reactive phases. The milling led to a five-fold increase in the surface area, resulting in enhanced leaching kinetics even at low acid concentration. The statistical design obtained optimal conditions of 8 h of milling followed by leaching in 1.73 M HCl at 75 °C, yielding 82% alumina extraction in precipitate with 85% purity in γ-alumina form and 63% potassium dissolution in sylvinite phase. The yield of the precipitate was ~65–68%, and the acid leach residue contained primarily silica.

中文翻译：

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受控条件下用于提取氧化铝和钾的绢云母粘土湿法冶金研究

目前的研究调查了绢云母粘土作为钾肥和氧化铝的替代来源。绢云母中的氧化铝和钾肥含量分别约为 35% 和 10%，而铝土矿中的含量为 50-55%。白云母和伊利石相稳定，发现直接浸出无效。在这里，进行了行星式球磨，这将稳定相分解为相对反应性的相。研磨导致表面积增加了五倍，即使在低酸浓度下也能增强浸出动力学。统计设计获得了研磨 8 小时的最佳条件，然后在 75°C 下在 1.73 M HCl 中浸出，在沉淀中提取 82% 的氧化铝，γ-氧化铝形式的纯度为 85%，钾溶解在钾盐相中 63%。沉淀的产率为~65-68%，