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A novel technology of chromium recovery from chromium-containing slag by Achromobacter sp.CH-1 based on the principle of bacterial leaching and bacteriosmelt has been proposed.Scanning Electron Microscope (SEM), Translated transmission Electron Microscope (TEM), Energy Dispersive X-ray Analysis (EDXA) and Electron Paramagnetic Resonance (EPR) were utilized to observe the appearance of bacterial cells before and after Cr(Ⅵ) reduction, and analyze the elemental composing of precipitate product during the process.