(广州有色金属研究院 资源综合利用研究所，广州 510651)
摘 要: 通过浮选实验、吸附量测定、Zeta电位测试、羟肟酸与Ca2+作用模型的建立以及红外光谱测试，研究羟肟酸对白钨矿的浮选作用机理。结果表明：当pH为8~10时，白钨矿具有很好的可浮性，且在pH=9时达到最大回收率，其中环已甲基羟肟酸(CHA)对白钨矿的捕收能力优于BHA的；在整个实验pH范围内(8~10)，CHA在白钨矿表面的吸附量均大于苯甲羟肟酸(BHA)的，CHA的加入使白钨矿表面动电位向负移动的程度要大于BHA的，且CHA与Ca2+的结合能更负，这均说明CHA更容易在白钨矿表面发生吸附，对白钨矿的捕收能力更强；BHA在白钨矿表面发生牢固的化学吸附，与钙离子作用生成了BHA钙盐。
关键字: 白钨矿；羟肟酸；浮选机理
（Research Institute of Resources Comprehensive Utilization,
Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510651, China）
Abstract:The flotation mechanism with hydroxamic acid of scheelite were researched by floatation experiment, adsorption measurement, Zeta potentiodynamic measurement, modeling of hydroxamic acid and Ca2+ and infrared spectrum measurement. The flotation experiment of scheelite show that scheelite has good flotability when pH is 8-10 and has maximum recovery especialy when pH=9. CHA has stronger collecting ability than BHA. At the whole range of pH (8-10), the adsorption amount of CHA is more than that of BHA, the negative moving degree of scheelite surface potentiodynamic added with CHA is more than BHA, binding energy between CHA and Ca2+ is more negative, which show that CHA is adsorbed easily on the scheelite surface and possesses stronger collecting ability. The chemical adsorption of BHA occurs firmly on the surface of scheelite, the BHA calcium generates after interacted with calcium ions.
Key words: scheelite; hydroxamic acid; flotation; mechanism
