摘要
针对铁矿石反浮选中含硅化合物浮选分离困难问题,研究组合阴离子捕收剂对石英的吸附机理,为低温浮选提供优质捕收剂。采用接触角测量仪、表面张力仪,红外光谱仪和石英微天平(QCM-D)对乙烯枝杈型表面活性剂+油酸钠组合捕收剂在浮选过程中的作用机理进行研究。结果表明:①组合捕收剂中多杈枝表面活性剂与脂肪酸的协同效应增强石英和角闪石疏水特性,使其接触角增大,含硅化合物中角闪石比石英更难吸附分选;②随捕收剂浓度的增加和温度的升高,组合捕收剂的表面张力逐渐减小,捕收能力增强且易生成稳定的泡沫层;③FTIR检测浸涂组合捕收剂后羧酸根的特征峰降低到1561 cm^-1和1416 cm^-1,发生明显的红移,表明C—O键能减弱,C—O键与活化后的石英表面发生化学吸附;④QCM-D检测结果显示,组合捕收剂在石英晶体表面吸附后,能量因子改变量达到6.23×10^-6。对齐大山选厂混磁精给矿在21℃的条件下进行"1粗1精3扫"闭路浮选流程试验,得到精矿全铁品位68.16%,铁回收率89.93%的良好指标。
Aiming at the difficults in the separation of silicon-containing minerals with the iron ores,the adsorption mechanism of combined anion collector on quartz was studied in order to provide a high quality collector for low temperature flotation.The mechanism of action of vinyl branching surfactant and sodium oleate collector in flotation was studied by using contact angle measuring instrument,surface tensiometer,infrared spectrometer and quartz microbalance(QCM-D).The results showed that①the synergistic effect of multi-branched surfactant and fatty acid enhanced the hydrophobic properties of quartz and amphibole,making the increase of the contact angle.Amphibole in silicone-containing compounds was more difficult to be adsorbed and separate compared with quartz.②With the increase of collector concentration and temperature,the surface tension of the combined collector decreased gradually,and the collection ability was enhanced and easy to produce a stable foam layer.③FTIR detecting results indicated that the characteristic peak of carboxylic acid root decreased to 1561 cm^-1 and 1416 cm^-1 after dipping and coating the combined collector,and a significant red shift occurred which indicating that the C-O bond energy was weakened and chemical adsorbtion occurred in the quartz surface.④QCM-D test results showed that the energy factor changed to 6.23×10^-6 after the combined collector adsorbed on the quartz crystal surface.A closed-circuit flotation process test of one coarse,one cleaning and three scavenging for mixed magnetic concentrate was carried out with Qidashan concentrator at the temperature of 21℃,and good indexes of 68.16%of total iron grade and 89.93%of iron recovery were obtained eventually.
作者
姜永良
付泳贺
姜效军
苏拓宇
JIANG Yongliang;FU Yonghe;JIANG Xiaojun;SU Tuoyu(School of Mining Engineering,University of Science and Technology Liaoning,Anshan 114051,China)
出处
《金属矿山》
CAS
北大核心
2020年第11期118-123,共6页
Metal Mine
关键词
石英
角闪石
枝杈型表面活性剂
接触角
表面张力
石英微天平
quartz
hornblende
branching surfactant
contact angle
surface tension
quartz crystal microbalance-dissipative
