Dissolution of diopside-bearing slag and its amorphous counterpart was investigated to decipher recovery potential of these slags. The contribution of direct slag phase dissolution was investigated using a biotic solution with Acidithiobacillus thiooxidans versus sterile growth medium, whereas citric acid was applied to demonstrate slags dissolution in organic medium. Potential metal donor slag phases and easily released elements were identified by comparing theoretical and experimental dissolution ratios. It was shown that K and Na were the most mobile elements leaching from glassy and diopside slag (up to 99%). Recovery targeted metals were released in the quantities of 56% (Cu)–96% (Zn) from glassy slag and 27% (Cu)–98% (Zn) from diopside slag. Results demonstrated that studied slags are good candidates for Zn recovery during short-term treatment, whereas extension of time would be required for efficient Cu extraction. Abiotic growth medium had little effect on metal leaching (up to 53% versus only 3% for the glassy and diopside slags, respectively). Glassy slag revealed greater susceptibility to dissolution as compared to diopside slag. Further studies improving recovery conditions are expected to improve environmental soundness of proposed treatments and to generate residues depleted in toxic elements. This study highlights the importance of evaluation of individual slags in terms of metal and major elements leachability.

中文翻译：

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含玻璃态和透辉石的冶金渣的（生物）溶解：实验和经济方面

研究了含透辉石的炉渣及其无定形对应物的溶解情况，以破译这些炉渣的回收潜力。使用含硫代酸硫硫杆菌的生物溶液研究了直接渣相溶解的作用与无菌生长培养基相比，柠檬酸被用于证明炉渣在有机培养基中的溶解情况。通过比较理论溶解度和实验溶解度，可以确定潜在的金属供体炉渣相和易释放元素。结果表明，钾和钠是从玻璃状和透辉石渣中浸出的最易移动的元素（高达99％）。回收目标金属从玻璃状炉渣中释放出56％（Cu）–96％（Zn），从透辉石炉渣中释放出27％（Cu）–98％（Zn）。结果表明，所研究的炉渣是短期处理中锌回收的良好候选者，而有效的铜提取则需要延长时间。非生物生长培养基对金属的浸出几乎没有影响（玻璃状和透辉石矿渣分别高达53％和3％）。与透辉石渣相比，玻璃渣显示出更高的溶解敏感性。有望进一步研究改善回收条件，以改善拟议处理方法的环境安全性，并产生贫化有毒元素的残留物。这项研究强调了根据金属和主要元素的浸出性评估单个炉渣的重要性。