The gradual depletion of mineral resources has led to the emergence of a new engineering challenge in the field of mineral processing: the effective treatment of low-grade ores. In this study, the low-grade titanium ore leaching solution was employed as the raw material. The extraction ability of a series of hydroxyl extractants for the most common metal iron in minerals was investigated. As a result, a new high-quality processing system for low-grade ore with branched-chain octanol as the core component was constructed. In the treatment of mineral leaching solution, branched-chain octanol has high selectivity and large capacity (111.7 g/L) for iron. It was capable of efficiently removing a significant quantity of iron ions in low-grade ores that were not anticipated to be present. By employing quantum chemical (QC) methodologies, the mechanism for the high selectivity of branched-chain octanol for Fe(Ⅲ) has been elucidated by analyzing the frontier molecular orbital (FMO) energy of acid salts of common metals in minerals. Combined with spectral analysis and slope method, the structure of the extracted complex was confirmed to be [n-R8-OH]2·H·FeCl4. On the basis of system optimization, a three-stage countercurrent extraction and three-stage countercurrent stripping was employed to remove all the Fe(Ⅲ) in the mineral leaching solution. And after detecting, the purity of the obtained Fe(III) solution was greater than 99.5 %. In the treatment of low-grade minerals, especially those containing key metals, the branched-chain octanol extraction system demonstrates high selectivity and reliability, which is a effective means to improve the quality of mineral leaching solution.

中文翻译：

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处理低品位矿石的策略：高效分离和提纯铁


矿产资源的逐渐枯竭导致矿物加工领域出现了新的工程挑战：低品位矿石的有效处理。本研究以低品位钛矿浸出液为原料。研究了一系列羟基萃取剂对矿物中最常见的金属铁的提取能力。由此，构建了以支链辛醇为核心成分的新型低品位矿石高质量处理系统。在矿物浸出液的处理中，支链辛醇对铁具有高选择性和大容量 （111.7 g/L）。它能够有效地去除低品位矿石中大量意想不到的铁离子。通过采用量子化学 （QC） 方法，通过分析矿物中常见金属的酸性盐的前沿分子轨道 （FMO） 能量，阐明了支链辛醇对 Fe（III.） 高选择性的机制。结合光谱分析和斜率法，证实提取的配合物结构为[n-R8-OH]2·H·氯化铁4.在系统优化的基础上，采用三级逆流萃取和三级逆流剥离，去除矿物浸出液中的所有 Fe（III.）。经检测，得到的 Fe（III） 溶液纯度大于 99.5 %。在处理低品位矿物，尤其是含有关键金属的矿物时，支链辛醇萃取系统表现出较高的选择性和可靠性，是提高矿物浸出液质量的有效手段。