共查询到19条相似文献,搜索用时 78 毫秒
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阐述了利用尾矿和废渣生产微晶玻璃不仅是简单的废物利用,也是向高附加值产品转变的有效途径,着重介绍了钽铌尾矿在微晶玻璃生产中的应用前景,表明了利用钽铌尾矿,在满足微晶玻璃理化性能的同时,又可因其价格低廉,而降低微晶玻璃的生产成本,带来较好的社会效益和经济效益。 相似文献
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以P507有机磷酸脂作萃取剂,在PH=3,相比(溶剂:萃取液)1:2和四级萃取的条件下,利用溶剂萃取法可将Ni^2+溶液(Ni^2+=5.61%)中的Zn^2+从3295ppm降至98ppm。该法有可能在分离除去废转化触媒回收镍中的杂质锌获得应用。 相似文献
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低品位铌钽矿高浓碱性介质浸出过程动力学研究 总被引:1,自引:0,他引:1
The leaching kinetics of niobium from a low-gr~te niobium-tantalum ore by concentrated KOH solution under atmospheric pressure has been studied. Significant effects of reaction temperature, KOH concentration,stirring speed, particle size and mass ratio of alkali-to-ore on the dissolution rate of niobium were examined. The experimental data of the leaching rates and the observed effects of the relevant operating variables were well interpreted with a shrinking core model under diffusion control. By using the Arrhenius expression, the apparent activation energy for the dissolution of niobium was evaluated. Finally, on the base of the shrinking core model, the rate equation was established. 相似文献
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Pre-dispersed solvent extraction (PDSE) was used to extract quercentin from its diluted solution. The influences of temperature, phase volume ratio (PVR), concentration of sodium Dodecyl benzene sulphonate and pH value etc. on the extraction efficiency were examined. It is found that, compared with traditional extraction techniques under the same condition, a higher extraction productivity can be obtained by PDSE. The stability of colloidal liquid aphrons plays an important role in this process. In a certain scope, the extraction efficiency increases with PVR. Excessive amount of solvent is not much helpful. A new analytical method by using ultraviolet spectrometer to determine the concentration of quercentin is established. 相似文献
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Pre-dispersed solvent extraction (PDSE) was used to extract quercentin from its diluted solution. The influences of temperature, phase volume ratio (PVR), concentration of sodium Dodecyl benzene sulphonate and pH value etc. on the extraction efficiency were examined. It is found that, compared with traditional extraction techniques under the same condition, a higher extraction productivity can be obtained by PDSE. The stability of colloidal liquid aphrons plays an important role in this process. In a certain scope, the extraction efficiency increases with PVR. Excessive amount of solvent is not much helpful. A new analytical method by using ultraviolet spectrometer to determine the concentration of quercentin is established. 相似文献
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以乙烯装置的离线模拟系统和合成氨装置的在线模拟系统为例,分析探讨了离、在线模拟系统的功能特点差异,以及系统中数据校正模型、基础工况模型的开发技术及应用效果。 相似文献
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溶剂萃取法分离氢化可的松和表氢化可的松 总被引:2,自引:0,他引:2
针对工业上现有结晶分离工艺的缺点,提出了分离氢化可的松及其光学异构体表氢化可的松的新方法——溶剂萃取法。实验发现,在常规醇类、酮类、酯类、醚类、氯代烃类和芳香烃等溶剂中,乙酸丁酯具有较好的萃取分离性能,以乙酸丁酯为萃取剂用溶剂萃取法分离氢化可的松粗品可获得纯度为98%以上的氢化可的松,已达到工业生产水平。文中还研究了乙醇含量、温度、盐析效应和pH对分配的影响。 相似文献
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溶剂萃取法分离水溶性甘草黄酮 总被引:3,自引:0,他引:3
以三烷基氧化膦(Trialkylphosphine Oxide, TRPO)石油醚溶液为萃取有机相,从甘草浸提液中对水溶性甘草黄酮进行了萃取分离. 正交实验表明,TRPO浓度是影响总黄酮萃取的显著因素,相比(A/O)的影响次之,pH值的影响最小. 在pH 5~8的范围内总黄酮萃取率随pH值升高而逐渐下降;在pH 5~6的范围内甘草酸的萃取率随pH值升高迅速降低,在pH 6以上几乎降为0;总黄酮萃取率随相比的增大而减小,随萃取剂浓度的增大迅速提高;总黄酮的萃取率随温度的升高而下降,说明萃取黄酮的反应是放热反应. TRPO萃取甘草甙的萃合比为3. 通过溶剂萃取方法可实现水溶性甘草黄酮和甘草酸的分离. 相似文献
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