Benzohydroxamic acid-lead (BHA-Pb) complex reagent is a commonly used collector for the flotation of oxidized ores such as tungsten ore, cassiterite, and ilmenite, but the BHA-Pb complex remaining in the mineral processing wastewater (MPW) after flotation is economically and efficiently difficult to remove. At present, the treatment technology usually starts from the treatment of MPW at a wastewater treatment station. However, the treatment cost is inevitably high due to the huge amount of MPW. In this study, a new process of removing residual BHA-Pb complex reagent from MPW in one-step using metal ions combined with gangue minerals in tailings pulp was proposed. It started from tailings pulp treatment and taking tailings reservoir as the main reaction site. The basic issues related to the new process were mainly studied. The concentration of BHA was characterized using chemical oxygen demand (COD). The results show that when Ca²⁺, Fe³⁺, or Al³⁺ was added to the BHA-Pb solution, only Fe³⁺ could effectively remove the COD of the BHA-Pb solution, while Ca²⁺ and Al³⁺ could not. This is because the BHA-Pb complex can be preferentially transformed into the BHA-Fe complex, and the COD of the BHA-Fe complex solution is most easily removed. However, BHA-Fe complex systems have dark colors and are difficult to settle. When gangue minerals are added to the BHA-Fe complex system, gangue minerals can play the role of coarse particles carrying fine particles settling, which is helpful to the sedimentation of the BHA-Fe complex system. The transformation mechanism between BHA-Pb and BHA-Fe complexes was explained by the conditional stability constants and Gibbs free energy changes analysis. In addition, the sedimentation mechanism of the BHA-Fe complex system was analyzed by zeta potential and scanning electron microscope-energy dispersive spectrometer. This study provides a new idea for removing residual organic flotation reagents from MPW starting from tailings pulp treatment.

苯甲羟肟酸-铅(BHA-Pb)络合物试剂是钨矿、锡石、钛铁矿等氧化矿石浮选常用的捕收剂，但浮选后残留在选矿废水(MPW)中的BHA-Pb络合物是经济有效地难以去除。目前，处理技术通常从废水处理站对MPW的处理开始。然而，由于MPW的数量巨大，处理费用不可避免地偏高。本研究提出了一种利用尾矿浆中金属离子结合脉石矿物一步去除MPW中残留BHA-Pb络合试剂的新工艺。它从尾矿浆处理开始，以尾矿库为主要反应场所。主要研究了与新工艺相关的基本问题。BHA 的浓度使用化学需氧量 (COD) 进行表征。结果表明，当 CaBHA-Pb溶液中加入²⁺、Fe ³⁺或Al ^{3+ ，只有Fe 3+}能有效去除BHA-Pb溶液的COD，而Ca ²⁺和Al ³⁺不能。这是因为BHA-Pb络合物可以优先转化为BHA-Fe络合物，BHA-Fe络合物溶液的COD最容易去除。然而，BHA-Fe 复杂体系颜色深，难以沉降。BHA-Fe复合体系中加入脉石矿物后，脉石矿物可以起到粗粒携细粒沉降的作用，有利于BHA-Fe复合体系的沉降。通过条件稳定常数和吉布斯自由能变化分析解释了 BHA-Pb 和 BHA-Fe 配合物之间的转化机制。此外，利用zeta电位和扫描电镜-能谱仪分析了BHA-Fe络合物体系的沉降机理。