(1. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083；
2. 中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083；
3. 中南大學(xué) 有色金屬資源化學(xué)教育部重點實驗室，長沙 410083；
4. 廣州有色金屬研究院，廣州 510651)
摘 要: 通過單礦物浮選實驗、吸附量、Zeta電位和紅外光譜測定，研究環(huán)己甲基羥肟酸(CHA)和苯甲羥肟酸(BHA)對黑鎢礦的浮選行為以及環(huán)己甲基羥肟酸在黑鎢礦表面的吸附機理。結(jié)果表明：在pH=4~12的范圍內(nèi)環(huán)己甲基羥肟酸對黑鎢礦的捕收能力強于苯甲羥肟酸的；該兩種羥肟酸浮選黑鎢礦優(yōu)選的pH值為9.0左右，此時，環(huán)己甲基羥肟酸能回收91.5%的黑鎢礦，而苯甲羥肟酸只能回收68.5%的黑鎢礦。兩種羥肟酸在黑鎢礦表面的吸附量都隨著羥肟酸用量的增大而增大，pH值對其在黑鎢礦表面吸附的影響與浮選實驗結(jié)果基本一致，且環(huán)己甲基羥肟酸在黑鎢礦表面的吸附量明顯大于苯甲羥肟酸在黑鎢礦的吸附量。紅外光譜和Zeta電位變化表明，環(huán)己甲基羥肟酸在黑鎢礦表面發(fā)生了化學(xué)吸附。
關(guān)鍵字: 黑鎢礦；羥肟酸；浮選；吸附機理
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China;
3. Key Laboratory of Resources Chemistry of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
4. Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510651, China）
Abstract:The flotation behavior of cyclohexyl hydroxamic acid (CHA) and benzohydroxamic acid (BHA) and the adsorption mechanism of cyclohexyl hydroxamic acid on wolframite surface were investigated through single mineral flotation experiments, adsorption capacity measurements, Zeta potential experiments and infrared spectrum analysis. The results show that the collecting ability of the cyclohexyl hydroxamic acid is stronger than that of benzohydroxamic acid at pH=4-12, and the optimal pH value in the flotation of wolframite with these two kinds of hydroxamic acids is 9.0，the maximum recovery of wolframite with cyclohexyl hydroxamic acid is 91.5%，while that with benzohydroxamic acid is only 68.5%. The adsorption capacities measurements demonstrate that the adsorption capacities of the two hydroxamic acids on wolframite surface are proportional to the dosage of hydroxamic acid, the effect of pH on the adsorption of wolframite surface agrees well with the result of flotation experiment, and the adsorption capacity of cyclohexyl hydroxamic acid onto wolframite surface is more than that of benzohydroxamic acid. Zeta potential and infrared spectrum analysis results prove that the adsorption of cyclohexyl hydroxamic acids on the wolframite surface is chemical adsorption.
Key words: wolframite; hydroxamic acid; flotation; adsorption mechanism
