N，N-二(3-氯-2-羟丙基)十二胺对菱镁矿浮选脱硅性能的影响

通过浮选实验研究了N，N-二(3-氯-2-羟丙基)十二胺(NCDA)作用下石英、菱镁矿和白云石的浮选行为.通过zeta电位测试、基团电负性判据和量子化学计算等分析研究了NCDA的性能及作用机理.浮选实验结果表明:在矿浆自然pH值条件下，加入同等用量的捕收剂，NCDA对石英的捕收能力比十二胺(DDA)强，对菱镁矿和白云石的捕收能力明显弱于DDA.zeta电位测试结果表明，NCDA与石英表面发生静电吸附和氢键作用.基团电负性、水油度和前线轨道能计算结果表明，相比DDA，NCDA具有更好的捕收性能和起泡性能，更容易与石英表面发生相互作用.

Effect of N，N-2 (3-chloride，2-hydroxypropyl) Dodecylamine on Flotation Desilicication of Magnesite Ore

Flotation behavior of quartz， magnesite and dolomite in the presence of N，N-2 (3-chloride，2-hydroxypropyl)dodecylamine(NCDA) was investigated by flotation experiments. Properties and adsorption mechanism of NCDA were analyzed by zeta potential test， group electronegativity criteria and quantum chemistry calculation. Flotation results showed that， under the natural pH value of ore pulp， while the same dosages of collectors are added， NCDA has better ability to collect quartz than DDA， but the collecting ability of NCDA to magnesite and dolomite is obviously weaker than that of DDA. Results of zeta potential tests showed that NCDA adsorb on quartz surface by electrostatic adsorption and hydrogen-bond interaction. The calculation results of group electronegativity， hydrophile-lipophile balance and frontier molecular orbital energy indicated that NCDA has better collecting and foaming properties than DDA. Meanwhile， it is easier to interact with the quartz surface.