(1. 中南大学 化学化工学院，长沙 410083；
2. 中南大学 资源加工与生物工程学院，长沙 410083；
3. 中南大学 有色金属资源化学教育部重点实验室，长沙 410083；
4. 广州有色金属研究院，广州 510651)
摘 要: 通过单矿物浮选实验、吸附量、Zeta电位和红外光谱测定，研究环己甲基羟肟酸(CHA)和苯甲羟肟酸(BHA)对黑钨矿的浮选行为以及环己甲基羟肟酸在黑钨矿表面的吸附机理。结果表明：在pH=4~12的范围内环己甲基羟肟酸对黑钨矿的捕收能力强于苯甲羟肟酸的；该两种羟肟酸浮选黑钨矿优选的pH值为9.0左右，此时，环己甲基羟肟酸能回收91.5%的黑钨矿，而苯甲羟肟酸只能回收68.5%的黑钨矿。两种羟肟酸在黑钨矿表面的吸附量都随着羟肟酸用量的增大而增大，pH值对其在黑钨矿表面吸附的影响与浮选实验结果基本一致，且环己甲基羟肟酸在黑钨矿表面的吸附量明显大于苯甲羟肟酸在黑钨矿的吸附量。红外光谱和Zeta电位变化表明，环己甲基羟肟酸在黑钨矿表面发生了化学吸附。
关键字: 黑钨矿；羟肟酸；浮选；吸附机理
（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
