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The adsorption equilibrium of a fluoride solution on 1-2 mm granular activated alumina modified by Fe2(SO4)3 solution was investigated. The experiments were conducted using a wide range of initial fluoride concentrations (0.5 to 180 mg8226;L61485;1 at pH ~7.0) and an adsorbent dose of 1.0 g8226;L61485;1. The application of Langmuir and Freundlich adsorption isotherm models (linear and nonlinear forms) generally showed that a single Langmuir or Freundlich equation cannot fit the entire concentration gap. Experimental data on low equilibrium concentrations (0.1 to 5.0 mg8226;L61485;1) was in line with both Langmuir and Freundlich isotherm models, whereas that of high equilibrium concentrations (5.0 to 150 mg8226;L61485;1) was more in line with the Freundlich isotherm model. A new Langmuir- Freundlich function was used for the entire concentration gap, as well as for low and high concentrations. 相似文献
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装载机是一种广泛用于公路、铁路、建筑、水电、港口、矿山等建设工程的铲土运输机械,也是工程建设中需求最大的机种。装载机的驱动桥是装载机的重要部件,负责向外输出动力和制动,其工作性能的好坏直接影响到整机的工作性能。驱动桥用齿轮油作为增加润滑、减少摩擦磨损的重要介质,其性能直接影响到驱动桥的性能。分析了装载机干式制动和湿式制动的技术特点,并对新型湿式制动驱动桥用油进行分析,结果表明:中石化的产品能够给湿式制动驱动桥提供良好的润滑保护,解决了目前湿式制动装载机制动异响、制动迟缓、制动高温等问题,保证其安全、高效的作业。 相似文献
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