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香樟中樟脑的超声波辅助溶剂提取及驱虫效果测定
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作者 陈聪 彭伊敏 +4 位作者 刘玲玲 蔡晓霞 陈健凤 陈领航 吉前华 《湖南林业科技》 2024年第5期69-73,96,共6页
为更高效地从香樟中提取并应用天然樟脑,本文探究了超声时间、溶剂浓度与料液比对香樟中樟脑提取率的影响,同时测定了樟脑的驱虫效果。结果得出:(1)超声波辅助溶剂提取樟脑的提取量显著高于对照组,超声波辅助提取60 min的效果较好;(2)... 为更高效地从香樟中提取并应用天然樟脑,本文探究了超声时间、溶剂浓度与料液比对香樟中樟脑提取率的影响,同时测定了樟脑的驱虫效果。结果得出:(1)超声波辅助溶剂提取樟脑的提取量显著高于对照组,超声波辅助提取60 min的效果较好;(2)有机溶剂乙醇浓度对樟脑的提取量存在显著影响,适宜的乙醇浓度为60%;(3)樟脑的提取量随料液比的升高而减小,适宜的料液比为1∶15;(4)天然樟脑具有较好的驱虫效果,驱虫率最高达96.30%,樟脑的驱虫率随时间的延长先提高后降低。本研究可为植物萜类化合物的提取和基于驱虫剂的害虫防治提供参考依据。 展开更多
关键词 超声波 萜类化合物 天然樟脑 紫外光光谱法 驱虫剂
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Effect and mechanism of siderite on reverse anionic flotation of quartz from hematite 被引量:8
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作者 罗溪梅 印万忠 +3 位作者 王云帆 孙传尧 马英强 刘建 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第1期52-58,共7页
Reverse flotation technology is one of the most efficient ways to improve the quality and reduce impurity of iron concentrate. Mineral processors dealing with hematite face a challenge that the flotation results of re... Reverse flotation technology is one of the most efficient ways to improve the quality and reduce impurity of iron concentrate. Mineral processors dealing with hematite face a challenge that the flotation results of reverse flotation of hematite are poor in presence of siderite using fatty acid as collector, starch as depressant of iron minerals and calcium ion as activator of quartz at strong alkaline pH. In this work, the effect of siderite on reverse anionic flotation of quartz from hematite was investigated. The effect mechanism of siderite on reverse flotation of hematite was studied by solution chemistry, ultraviolet spectrophotometry(UV) and Fourier transform infrared spectroscopy(FTIR). It was observed that siderite had strong depressive effect on quartz in flotation using sodium oleate as collector, corn starch as depressant of iron minerals and calcium chloride as activator of quartz at strong alkaline pH. The starch was adsorbed onto calcium carbonate by chemical reaction which was formed by CO^(2-)_3 from siderite dissolution and Ca^(2+) from calcium chloride as activator of quartz and precipitated on the surface of quartz, which resulted in improving the hydrophilic ability of quartz. 展开更多
关键词 SIDERITE QUARTZ HEMATITE mineral dissolution STARCH calcium carbonate sodium oleate froth flotation
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Effect of Mn(II) on quartz flotation using dodecylamine as collector 被引量:2
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作者 杨志超 冯雅丽 +3 位作者 李浩然 王维大 滕青 张旭 《Journal of Central South University》 SCIE EI CAS 2014年第9期3603-3609,共7页
Quartz is, in most cases, the major gangue mineral found in the manganese ore. Mn iron, dissolved from the surface of ore, will determine the interfacial properties of the particles and, thus, their flotation behavior... Quartz is, in most cases, the major gangue mineral found in the manganese ore. Mn iron, dissolved from the surface of ore, will determine the interfacial properties of the particles and, thus, their flotation behavior. In this work, the effect of Mn2+ on quartz flotation was investigated through flotation tests. It was found that quartz can be depressed with Mn2+ and floated with dodecylamine in the pH region 7-8. In order to prove the validity of the findings, UV spectrophotometry, FTIR and SEM-EDS were carried out. UV spectrophotometry tests results show that Mn2+ can competitive adsorb with RNH3+ in the surface of quartz at acidic and neutral pH values. The FTIR measurements and SEM-EDS analysis indicate that Mn2+ forms precipitation and adsorbs on the negatively charged quartz surface, it induces quartz recovery dropping in alkaline pH. Furthermore, in the case of sodium hexametaphosphate(SH), sodium silicate or citric acid, the effects of Mn2+ were also studied. This depression in the given Mn2+ did not disappear. Citric acid is an appropriate modifier to separate quartz depressed by Mn2+ from other ores at pH 7. 展开更多
关键词 FLOTATION QUARTZ Mn(II) DODECYLAMINE
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