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把重金属从废水中分离出来,国内外曾用“铁氧体法”、化学还原法、薄膜蒸发器、离子交换和溶剂萃取等法处理含铬的电镀废水,但都有一定的局限性。1968年 N、N、Li 提出液膜分离技术(1)以来,对废水中含的重金属的分离,开展广泛的研究,例如分离铜和苯酚,已经有工业规模的应用。因此,用液膜分离技术分离重金属日益显得重要。我们在液膜技术分离铬的报道中,曾用 span80、TBP、煤油组成的膜体系来分离铬。其工艺流程已打通,对 Cr_2O_7~(2-)中 Cr~(6+)的分离效率高速度快,分离铬一次达到国家排放标准
The separation of heavy metals from waste water at home and abroad have used “ferrite method”, chemical reduction method, thin-film evaporator, ion exchange and solvent extraction and other treatment of chromium-containing electroplating wastewater, but have some limitations. In 1968 N, N, Li proposed liquid membrane separation technology (1) since the separation of heavy metals contained in wastewater, to carry out extensive research, such as the separation of copper and phenol, has been the industrial scale applications. Therefore, the use of liquid membrane separation of heavy metals is increasingly important. In our report on the separation of chromium from liquid film technology, we used a membrane system consisting of span80, TBP and kerosene to separate chromium. The technological process has been opened up, the separation efficiency of Cr ~ (6+) in Cr_2O_7 ~ (2-) is high and the separation rate of chromium reaches the national emission standard