Authors: Zhihui Yang Liyuan Chai Yunyan Wang Kun Zhao Yude Shu
Publish Date: 2008/12/14
Volume: 15, Issue: 6, Pages: 824-829
Abstract
A batch of column experiments was carried out to investigate the change of CrVI concentration leached out from chromiumcontaining slag with HCl as leaching agent and to study influences of pH ratio of solid mass to solution volume flow velocity and temperature on CrVI leaching The optimal parameters were obtained for CrVI leaching and a fitting model was established to describe the procedure of CrVI leaching The results show that CrVI concentration in leachate increases with decreasing pH and increasing flow velocity and temperature Moreover CrVI leaching percentage increases with increasing ratio of solid mass to solution volume The optimal parameters for CrVI selective leaching are as follows pH=30 15 of ratio of solid mass to solution volume 180 mL/min of flow velocity and 40 °C of temperature The procedure of CrVI leaching fits well with the model v=187t −054 indicating that the leaching rate of CrVI declines in an exponential order of −054
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