| 摘要 |
A process is provided for condensing zinc and other metal vapors from a gaseous stream. A duplex condensing bath is provided, having a bottom layer of molten zinc and a top layer comprising a liquid condensing medium, such as a molten salt. The molten salt is inert to, immiscible with, and less dense than the molten zinc, and has a negligible zinc vapor pressure even at temperatures greater than 700 DEG C. The molten salt condensing medium is splashed into, or otherwise contacted with the gaseous stream, causing condensation of the zinc and other metal vapors, which then partition with the molten zinc layer of the duplex condensing bath. The process of the present invention is a significant improvement over current molten zinc-type splash condenser systems. The negligible zinc vapor pressure of the molten salt layer permits operating temperatures of 700 DEG C. or more, thereby increasing the efficiency of vapor recovery by limiting the detrimental oxide-forming back reactions that occur at lower operating temperatures. |
