【摘要】 以溴代十二烷和1,1,3,3-四甲基胍等为原料合成了Gemini型十二烷基胍，并将其应用于矿物捕收剂领域。实验过程中，利用正交试验确定了最佳反应工艺条件：反应温度80℃、溴代十二烷与1,1,3,3-四甲基胍物质的量比为1∶1.2、反应时间为10h。在最佳条件下，十二烷基胍转化率最高为53.2%。FT-IR和1H NMR结果表明该反应成功地合成了目标产物。测定了样品的临界胶束浓度（CMC），其CMC相比于单核十二烷基三甲基氯化铵低1个数量级，说明其具有良好的表面活性，可用作矿物捕收剂。在矿物浮选模拟实验中，Gemini型十二烷基胍具有一定的浮选能力，在较低的浓度下对铁的回收率能够达到60.3%。通过捕收机理分析发现，Gemini型十二烷基胍因其具有更多的甲基作为取代基，同时具有“双头双尾”的结构，从而使其与矿物形成静电结构，对铁的捕收能力极大增强。更多还原

【Abstract】 Gemini type dodecyl guanidine were synthesized from bromododecane and 1,1,3,3,3-tetramethylguanuanidine and applied as mineral collector. The orthogonal test was used to determine the optimal reaction conditions: the reaction temperature was 80 ℃, the molar ratio of bromododecane and 1,1,3,3-tetraethylguanidine was 1∶1.2, the reaction time was 10 h. Under the optimal reaction conditions, the highest conversion rate of guanidyl guanidine was 53.2%. FT-IR and 1H NMR showed that the target product was prepared successfully. The critical micelle concentration of the sample was determined, and its CMC was one order of magnitude lower than that of mononuclear dodecyl trimethyl ammonium chloride, indicating that it had good surface activity and was suitable as mineral collector. In the mineral flotation simulation experiment, Gemini type dodecyl guanidine had certain flotation capacity and 60.3% of iron was recovered at lower concentration. Through the analysis of the capture mechanism, it was found that Gemini-type dodecyl guanidine had more methyl groups as a substituent and had a "double head and two tail" structure, which made it form an electrostatic structure with minerals and greatly enhance its ability to capture iron.更多还原