(廣州有色金屬研究院 資源綜合利用研究所，廣州 510651)
摘 要: 通過(guò)浮選實(shí)驗(yàn)、吸附量測(cè)定、Zeta電位測(cè)試、羥肟酸與Ca2+作用模型的建立以及紅外光譜測(cè)試，研究羥肟酸對(duì)白鎢礦的浮選作用機(jī)理。結(jié)果表明：當(dāng)pH為8~10時(shí)，白鎢礦具有很好的可浮性，且在pH=9時(shí)達(dá)到最大回收率，其中環(huán)已甲基羥肟酸(CHA)對(duì)白鎢礦的捕收能力優(yōu)于BHA的；在整個(gè)實(shí)驗(yàn)pH范圍內(nèi)(8~10)，CHA在白鎢礦表面的吸附量均大于苯甲羥肟酸(BHA)的，CHA的加入使白鎢礦表面動(dòng)電位向負(fù)移動(dòng)的程度要大于BHA的，且CHA與Ca2+的結(jié)合能更負(fù)，這均說(shuō)明CHA更容易在白鎢礦表面發(fā)生吸附，對(duì)白鎢礦的捕收能力更強(qiáng)；BHA在白鎢礦表面發(fā)生牢固的化學(xué)吸附，與鈣離子作用生成了BHA鈣鹽。
關(guān)鍵字: 白鎢礦；羥肟酸；浮選機(jī)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
