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钼为稀贵金属,应用广泛。近年来用钼微肥使农业获得大面积增产。云南省最近发现有零星钼矿。为发展云南农业生产,作者研究了浓集金属钼的方法,用70年代发明的液膜技术对钼的提取作了一系列的探索。成功地获得了最佳液膜组成为span80-三辛胺-煤油-Na_2HPO_4。破乳后钼的浓缩浓度增加了8倍多,其制膜方法为:在500ml烧瓶中加入膜溶剂煤油30ml,表面活性剂span80(山梨醇单油酸酯)4g,流动载体三辛胺5ml,混匀后加入解吸剂0.25mol·L~(-1)Na_2HPO_4 30ml,高速搅拌(2000～3000转/min),即制得乳黄油状液膜。其提取方法为:在500ml烧瓶中按10/100乳水比加料,慢速搅拌(150～200转/min),使两相充分接触,每隔5min沉清分离,取水样(含钼水液)分析,共5～6次。破乳:将富集了MoO_4~(2-)的乳浊液相水浴加热,破乳,沉清分离,取水相分析钼的含量。或者加乙酸乙酯或戊醇使其破乳。本法能迅速而有效地从稀溶液中提取MoO_4~(2-),提取率可达98%以上。采用本液膜体系提取MoO_4~(2-)比较合理的操作条件为外相液pH=3.15,浓度小于100ppm,水乳比为100/10。接触时间为25min,如果在外相溶液中加入1g NaCl和1g柠檬酸,效果更好。
Molybdenum is a rare metal, widely used. In recent years, molybdenum fertilizer to make large-scale agricultural production. Yunnan province recently discovered sporadic molybdenum ore. In order to develop agricultural production in Yunnan Province, the author studied the method of concentrating metallic molybdenum and explored molybdenum extraction using the liquid film technology invented in the 1970s. Successfully obtained the best liquid film composition span80 - trioctylamine - kerosene - Na_2HPO_4. After demulsification, the concentration of molybdenum increased more than 8 times. The membrane was prepared by adding 30 ml of kerosene, 5 g of surfactant span80 (sorbitol monooleate) and 5 ml of mobile carrier trioctylamine in a 500 ml flask, After mixing, add desorbent 0.25mol·L -1 Na_2HPO_4 30ml, high-speed stirring (2000 ~ 3000 rev / min), that was prepared creamy liquid film. The extraction method comprises the following steps: mixing 10/100 milk in a 500ml flask under slow stirring (150-200 revolutions / min) to fully contact the two phases, separating the sediment every 5 minutes, taking a water sample (containing molybdenum water Liquid) analysis, a total of 5 to 6 times. Demulsification: the emulsion enriched MoO_4 ~ (2-) water bath heating, demulsification, Shen Qing separation, water phase analysis of molybdenum content. Or add ethyl acetate or amyl alcohol to demulsification. This method can quickly and effectively extract MoO_4 ~ (2-) from dilute solution, the extraction rate can reach more than 98%. The liquid membrane system to extract MoO_4 ~ (2-) more reasonable operating conditions for the external phase liquid pH = 3.15, the concentration of less than 100ppm, water and milk ratio of 100/10. The contact time is 25min, if adding 1g NaCl and 1g citric acid to the external phase solution, the effect is better.