本文關(guān)鍵詞：乳液聚合制備納米粒子捕收劑及其表征　出處：《江西理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 微細(xì)粒 黃銅礦 乳液聚合 納米粒子 捕收劑

【摘要】：由于微細(xì)粒級礦物粒度小,質(zhì)量和動量很小,界面自由能很高,導(dǎo)致其氧化速率高,溶解度增大,對藥劑選擇性吸附差,浮選速率低,礦泥罩蓋、機(jī)械夾雜嚴(yán)重,使得微細(xì)粒級礦物成為選礦領(lǐng)域的難題之一。近年來,國外開始有學(xué)者在進(jìn)行納米粒子浮選捕收劑方面的研究,因而應(yīng)用納米粒子做微細(xì)粒礦物浮選捕收劑既有理論依據(jù)又有現(xiàn)實(shí)根據(jù)。本論文首先根據(jù)浮選對捕收劑性質(zhì)的要求及乳液聚合單體性質(zhì),設(shè)計(jì)合成St、MBT和St、VI二元共聚物,并通過聚合反應(yīng)式和MS模擬來預(yù)測聚合產(chǎn)物可能的結(jié)構(gòu)式。接著考察了乳液聚合制備新型疏水性納米粒子捕收劑過程中,不同條件對納米粒子捕收劑單體轉(zhuǎn)化率和粒徑的影響,尋找最佳的合成條件。然后對納米粒子捕收劑進(jìn)行了紅外光譜、激光粒度、掃描電鏡、Zeta電位和接觸角測試來分析納米粒子捕收劑的表面形貌、成分等特性。接著用不同條件下合成的納米粒子作捕收劑分別對微細(xì)粒黃銅礦、石英和黃鐵礦進(jìn)行了浮選用量和p H值條件試驗(yàn),以獲得納米粒子捕收劑作用效果。最后從礦物與納米粒子捕收劑作用前后的紅外光譜、Zeta電位、接觸角和掃描電鏡測試,分析了納米粒子捕收劑與三種礦物的作用機(jī)理。在單體苯乙烯用量5.0 g,乳化劑SDS用量0.08 g,引發(fā)劑APS用量0.025 g,功能型單體2-巰基苯并噻唑?yàn)?.125 g,攪拌速度為400 r/min,溫度為70℃的條件下合成的納米粒子捕收劑HNP的單體轉(zhuǎn)化率和粒徑最優(yōu),分別為86.20%和77 nm。掃描電鏡結(jié)果說明HNP的粒徑大小、均勻性和分散性都是最好的。HNP的紅外光譜圖說明合成的聚合物中,St中的C=C雙鍵和BMT的C=N雙鍵分別打開發(fā)生聚合。接觸角測試發(fā)現(xiàn)HNP的接觸角為105.29,疏水性較好。純礦物浮選實(shí)驗(yàn)結(jié)果說明不同納米粒子捕收劑的回收效果不同,HNP的回收效果最好。在自然p H值條件下,納米粒子乳液用量為1.0ml,無起泡劑時,能很好地實(shí)現(xiàn)微細(xì)粒黃銅礦與黃鐵礦、石英的分離。紅外光譜圖和Zeta電位圖可知,HNP與黃銅礦和黃鐵礦之間存在化學(xué)吸附,與石英之間只存在氫鍵作用。接觸角測試影響試驗(yàn)可知,HNP對黃銅礦的接觸角有極大的增大,對黃鐵礦的接觸角也有增大,而對石英接觸角的增大卻不明顯。由掃描電鏡圖可知,礦物的回收率與HNP在其表面的吸附有直接關(guān)系,HNP在三種礦物表面的吸附量大小順序?yàn)?黃銅礦黃鐵礦石英,與回收率結(jié)果一致。
[Abstract]:Due to the small particle size, small mass and momentum, high interface free energy, high oxidation rate, increased solubility, poor selective adsorption of reagent, low flotation rate, mineral mud cover. The mechanical inclusion is very serious, which makes the fine grained mineral become one of the difficult problems in the field of mineral processing. In recent years, some scholars abroad began to study the collector of nano-particle flotation. Therefore, the use of nano-particles as flotation collector has both theoretical and practical basis. Firstly, St was designed and synthesized according to the requirements of flotation for collector properties and the properties of emulsion polymerization monomer. The binary copolymers of MBT and Stu VI were used to predict the possible structure of polymerization products by polymerization reaction and MS simulation. Then the process of preparing new hydrophobic nanoparticles collector by emulsion polymerization was investigated. The effects of different conditions on monomer conversion and particle size of nano-particle collector were studied to find the best synthesis conditions. Then infrared spectroscopy laser particle size scanning electron microscope were used to study the properties of nano-particle collector. Zeta potential and contact angle measurements were used to analyze the surface morphology, composition and other properties of nano-particle collector, and then nano-particles were used as collector for fine chalcopyrite under different conditions. The flotation dosage and pH value of quartz and pyrite were tested in order to obtain the effect of nano-particle collector. Finally, the Zeta potential was obtained from the infrared spectrum before and after the interaction between mineral and nano-particle collector. The contact angle and scanning electron microscope (SEM) test showed that the interaction mechanism of the collector with three minerals was analyzed. The amount of monomer styrene was 5.0 g and the amount of emulsifier SDS was 0.08 g. The amount of initiator APS was 0.025 g, the functional monomer 2-mercaptobenzothiazole was 0.125g, and the stirring speed was 400rpm. The monomer conversion and particle size of HNP were optimized at 70 鈩，

本文編號：1434562