聚丙烯酰胺类抑制剂对一水硬铝石和高岭石可浮性差异调控的影响

Effect of Polyacrylamide Inhibitors on the Regulation of Floatability Difference between Diaspore and Kaolinite

针对捕收剂在一水硬铝石与高岭石表面的吸附选择性较差的问题,添加3种不同类型的聚丙烯酰胺抑制剂调变捕收剂在矿物表面的选择性吸附差异,研究抑制剂类型对捕收剂丙撑基双十二酰胺丙基二甲基氯化铵(DAPDPAC)在矿物表面的吸附量差异和相互作用变化,以及抑制剂对两种矿物的浮选影响。浮选试验结果表明:与非离子聚丙烯酰胺(NPAM)和阴离子聚丙烯酰胺(APAM)相比,阳离子聚丙烯酰胺(CPAM)显示了捕收剂对两种矿物显著的浮选调变差异,且CPAM在浓度80 mg/L时,一水硬铝石的回收率受到明显抑制,而高岭石的回收率几乎不变,且在酸性至弱碱性环境下,可以较好地实现一水硬铝石和高岭石的浮选分离。红外光谱测试结果表明:添加的抑制剂CPAM有效地阻碍了DAPDPAC在一水硬铝石表面的吸附,而在高岭石表面的吸附无明显变化。吸附量、Zeta电位及XPS测试结果表明:CPAM用量大于80 mg/L时,DAPDPAC在一水硬铝石和高岭石表面的吸附量差值保持在9.76×10^(-7)mol/g以上。因此,CPAM可有效调控DAPDPAC在一水硬铝石和高岭石表面的选择性吸附,有利于强化DAPDPAC对一水硬铝石和高岭石的浮选分离。

In view of the poor adsorption selectivity of collectors on the surface of diaspore and kaolinite,three different types of polyacrylamide inhibitors were added to adjust the selective adsorption difference of collectors on the surface of miner-als.The effect of inhibitor type on the adsorption capacity difference and interaction change of the collector propylene bisdode-cylamide propyl dimethyl ammonium chloride(DAPDPAC)on the mineral surface,and the effect of the inhibitor on the flota-tion of the two minerals were studied.The flotation test results showed that compared with nonionic polyacrylamide(NPAM)and anionic polyacrylamide(APAM),cationic polyacrylamide(CPAM)showed a significant difference in flotation adjustment of the two minerals by the collector.When the concentration of CPAM was 80 mg/L,the recovery rate of diaspore was signifi-cantly inhibited,while the recovery rate of kaolinite was almost unchanged.In the acidic to weakly alkaline environment,dia-spore and kaolinite could be well separated by flotation.The results of infrared spectroscopy showed that the addition of inhibi-tor CPAM effectively hindered the adsorption of DAPDPAC on the surface of diaspore,while the adsorption on the surface of kaolinite did not change significantly.The results of adsorption capacity,Zeta potential and XPS tests showed that when the dosage of CPAM was more than 80 mg/L,the difference of adsorption capacity of DAPDPAC on the surface of diaspore and ka-olinite remained above 9.76×10^(-7)mol/g.Therefore,CPAM can effectively regulate the selective adsorption of DAPDPAC on the surface of diaspore and kaolinite,which is beneficial to strengthen the flotation separation of diaspore and kaolinite by DAP-DPAC.