Mechanochemically activating lepidolite to allow easier lithium extraction and safer thallium handling through alunite formation

Abstract

Green chemistryPlease find enclosed our manuscript entitled "Mechanochemically activating lepidolite to allow easier lithium extraction and safer thallium handling through alunite formation" which we would like to submit for publication as a research paper in Green chemistry.In this study, we aimed to address the environmental burden caused by traditional hightemperature roasting methods for lithium extraction from lepidolite, which often leads to the release of toxic pollutants, including thallium contamination. Through mechanochemical activation of lepidolite, we were able to achieve efficient lithium extraction at mild metallurgical conditions and prevent thallium volatilization. Our findings highlight a novel approach to mineral processing that minimizes environmental impact and enhances safety in handling toxic elements. The main findings of our study demonstrate that by ball milling lepidolite and subsequently incorporating aluminum hydroxide to form alunite, we were able to achieve over 99% leaching efficiency of Li + /K + at room temperature with minimal acid solution. Furthermore, the formation of alunite facilitated the removal of both K + and Tl + cations, with removal percentages exceeding 98% at specific molar ratios of the compounds. These results not only offer a sustainable solution for lithium extraction but also provide insights into the safe disposal of toxic species in mineral processing.