Salicylhydroxamic acid (SHA) and octyl hydroxamic acid (OHA) are two commonly used hydroxamic acid-based collectors in fine cassiterite flotation. While some reports suggest that a mixture of OHA and SHA yields superior results compared to their individual use, there is a lack of experimental exploration and theoretical analysis. In this study, the flotation performance and the associated adsorption mechanism of SHA, OHA and their mixture on fine cassiterite particles was systematically investigated. The results demonstrate a synergistic effect between SHA and OHA in enhancing fine cassiterite flotation, with the most significant enhancement occurring at a 1:1 mass ratio under the natural pH conditions. This finding is corroborated by contact angle and zeta potential tests. When both SHA and OHA are present, SHA likely attaches to the cassiterite surface via chemisorption in the form of a five-membered chelate ring, while OHA adheres through physical adsorption, primarily establishing hydrogen bonds with oxygen sites on the cassiterite surface or with SHA molecules. The adsorption ratio of SHA to OHA onto cassiterite surfaces is approximately 69%: 31% when an equal mass of SHA and OHA interact with cassiterite under the natural pH condition.

水杨基异羟肟酸（SHA）和辛基异羟肟酸（OHA）是细锡石浮选中两种常用的异羟肟酸类捕收剂。虽然一些报告表明，与单独使用相比，OHA 和 SHA 的混合物产生了更好的结果，但缺乏实验探索和理论分析。本研究系统地研究了SHA、OHA及其混合物对细锡石颗粒的浮选性能和相关吸附机理。结果表明，SHA 和 OHA 在增强细锡石浮选方面具有协同效应，在自然 pH 条件下，质量比为 1:1 时，增强效果最显着。接触角和 zeta 电位测试证实了这一发现。当 SHA 和 OHA 都存在时，SHA 可能通过五元螯合环形式的化学吸附附着在锡石表面，而 OHA 通过物理吸附附着，主要与锡石表面上的氧位点或 SHA 分子建立氢键。当等质量的SHA和OHA在自然pH条件下与锡石相互作用时，SHA和OHA在锡石表面的吸附比约为69%: 31%。