新型低温捕收剂反浮选齐大山选厂混磁精矿工艺研究

Reverse Flotation of Mixed Magnetic Concentrate in Qidashan Concentrator with New Low⁃Temperature Collector

为解决齐大山选厂反浮选使用高温浮选药剂问题,采用实验室制备的新型低温组合捕收剂AG⁃1对齐大山选厂混磁精矿在室温(20℃)下进行反浮选试验。结果表明,矿浆pH=11.5、抑制剂玉米淀粉用量950 g/t、活化剂CaO用量100 g/t、捕收剂AG⁃1用量750 g/t条件下,一粗一精三扫反浮选闭路流程试验可以获得TFe品位68.13%、回收率88.43%的铁精矿。浮选精矿、尾矿XRD图谱和光学显微镜分析结果表明,组合捕收剂AG⁃1具有较好的选择性,可以有效分离脉石矿物石英和有用矿物。组合捕收剂AG⁃1与单一捕收剂油酸钠、十二胺表面张力对比分析结果表明,组合捕收剂AG⁃1表面张力较小,降低气液界面表面张力的能力较强,可以更好地提高矿物表面的疏水性。

Aiming at the commercial production problems in the usage of high⁃temperature reagents for the reverse flotation in Qidashan Concentrator,a new laboratory⁃prepared combined collector(AG⁃1)was adopted in the reverse flotation of mixed magnetic concentrate at room temperature(20℃).The results show that a reverse flotation flowsheet consisting of one stage of roughing,one stage of cleaning and three stages of scavenging,with pulp pH of 11.5,the dosages for depressant(corn starch),activator(CaO)and collector(AG⁃1)at amount of 950 g/t,100 g/t and 750 g/t,respectively,can yield an iron concentrate grading 68.13%TFe at 88.43%recovery.XRD patterns and optical microscopy visualization of flotation concentrate and tailings show that AG⁃1 has good selectivity,and can effectively separate valuable minerals from gangue mineral of quartz.Compared with the single collector of sodium oleate or dodecylamine,AG⁃1 possesses a lower surface tension and a stronger ability in reducing the surface tension of gas⁃liquid interface,which can better improve mineral hydrophobicity.