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制备了3种含有十二碳链的Gemini型阳离子表面活性剂(分别简写为12-2-12、12-4-12和12-6-12)。通过元素分析、红外光谱和质谱等对合成产物进行了表征。研究了3种合成的Gemini阳离子捕收剂对高岭石的浮选行为,并比较了新型捕收剂与传统捕收剂对高岭石浮选回收的差异。在相同实验条件下,Gemini型新药剂对高岭石的捕收能力大于传统药剂,它具有浮选效率高、受pH影响小等特点,是一种高效环保的新型阳离子表面活性剂。 相似文献
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通过单矿物浮选试验,考察了Gemini型捕收剂Gemini-31503和十二胺对石英和磁铁矿的浮选特性,结果表明,Gemini-31503在较宽的pH范围里对石英具有很强的捕收能力,并且对石英具有良好的选择性,其性能明显优于十二胺。用Gemini-31503对石英和磁铁矿的人工混合矿进行反浮选,在不需再添加其他任何药剂的情况下取得了良好的分选指标。动电位测定和红外光谱分析结果显示,Gemini-31503在两种矿物表面的吸附主要为静电吸附,且在相同条件下,Gemini-31503在石英表面的吸附量比在磁铁矿表面的吸附量大。 相似文献
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The flotation mechanism of aluminosilicate minerals using alkylguanidine collectors was studied through flotation experiments, Zeta potential measurements and FT-IR spectrum analysis. It is shown that kaolinite, illite and pyrophyllite all exhibit good floatability with alkylguanidines as collectors at pH 4-12. The flotation recoveries rise with the increase of the carbon chain length. Isoelectric point(IEP) is determined to be 3.5, 3.0 and 2.3 for kaolinite, illite and pyrophyllite, respectively. However, it is anomalous that the presence of cationic collectors has less influence on the negatively charged mineral surfaces. It is explained by the special structure of guanidine which is one of the strongest bases, having two -NH2 groups. One of them maybe interacts with minerals by electrostatic forces, and the other maybe forms hydrogen bonding with OH- ions on the aluminosilicate surfaces or in the aqueous solution, increasing the density of negative charge on the aluminosilicate surface and leading unpronounced positive charge to increase on the aluminosilicate. By combining the flotation tests, Zeta potential and FTIR measurements above, the interaction mechanism can be concluded. The simultaneous presence of cationic and neutral amine groups makes it possible for SAG cation to bind on three aluminosilicate minerals by both electrostatic attraction and hydrogen bonding. While in acidic medium, the interaction of the alkylguanidines on the aluminosilicate surfaces is mainly by means of electrostatic force and hydrogen bond; in the alkaline medium, it is by the way of electrostatic effect and hydrogen bond. 相似文献
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中碱度条件下乙氧羰基硫脲浮选分离铜硫 总被引:5,自引:0,他引:5
对乙氧羰基硫脲和丁黄药组合捕收剂方案浮选德兴铜矿进行了小型和工业试验研究.结果表明,与丁黄药单一捕收剂方案相比,组合捕收剂方案可使石灰用量降低2/3,实现铜铁混合精矿在pH值为10.5左右的高效浮选分离,显著提高矿山铜、金和钼的回收率.采用普遍化微扰理论和密度泛函B3PW91/6-31G(D)计算对上述实验结果进行了理论分析.ECTU的反应中心为硫代羰基中的硫原子,ECTU的最高占据分子轨道与次最高占据分子轨道的能量接近,主要由硫代羰基中的硫原子组成.ECTU的最低未占据分子轨道由官能团-O-C(=O)-N-C(=S)-N-中各原子的pz轨道组成,为一大π键,具有强烈接受和分散电子对的能力.ECTU易与表面电子组态为(t2g)6(eg)3Cu(Ⅱ)或t6e4 Cu(Ⅰ)的硫化铜矿物形成正配键和反馈键,而难与表面电子组态为(t2gа)3(egа)2 Fe(Ⅲ)或(t2g)6Fe(Ⅱ)的硫化铁矿物作用.UV和FTIR光谱结果进一步证实了ECTU对铜矿物具有优异的捕收能力,对硫矿物具有较好的选择性. 相似文献