This article studies the optimization and investigation of extraction reactions of all contained metal ions during the recovery of titanium from HCl leachate of ilmenite. Firstly, the most suitable extractant is selected by comparing the extraction and stripping effects of multiple types of extractants on all metal ions. After that, the impurity metal ions coextracted could be effectively removed by studying the scrubbing of all metal ions. Then the titanium solution with purity of 99.8% is obtained. The contents of non-ferrous metal ions manganese, vanadium, chromium, and iron contained are 0.02%, 0, 0.06% and 0.03%, respectively. Additionally, the high-concentrated iron remaining in organic phase is also recovered with purity of 99.7% after stripping titanium. The species of extractant in HCl solution are characterized by FT-IR and ¹H NMR. The effects of H⁺ and Cl⁻ on the speciation of all metal ions are evaluated. The differences of the extraction capacity of metal ions are revealed in detail. Finally, the extraction mechanism of all metal ions extracted by specific extractant are proposed. The methodology described in this article may help the increase of titanium dioxide quality produced from ilmenite.

本文研究了从钛铁矿盐酸浸出液中回收钛过程中所有金属离子的提取反应的优化和研究。首先，通过比较多种萃取剂对所有金属离子的萃取和反萃取效果，选择最合适的萃取剂。之后，通过研究对所有金属离子的洗涤，可以有效去除共萃取的杂质金属离子。得到纯度为99.8%的钛溶液。所含有色金属离子锰、钒、铬、铁的含量分别为0.02%、0、0.06%和0.03%。此外，有机相中残留的高浓度铁在反提钛后也以99.7%的纯度被回收。HCl溶液中萃取剂的种类通过FT-IR和¹ H 核磁共振。评估了 H ⁺和 Cl ^-对所有金属离子形态的影响。详细揭示了金属离子提取能力的差异。最后提出了特定萃取剂对所有金属离子的萃取机理。本文中描述的方法可能有助于提高钛铁矿生产的二氧化钛质量。