Detoxification of chromium-containing slag by Achromobacter sp. CH-1 and selective recovery of chromium

• Published in: Transactions of Nonferrous Metals Society of China 2010-08, Vol.20 (8), p.1500-1504
• Main Author: 柴立元 王云燕 杨志辉 王庆伟 王海鹰
• Format: Article
• Language: English
• Subjects: Achromobacter sp. CH-1; Bacterial leaching; Chromium; chromium(VI) reduction; Electron paramagnetic resonance; Recovery; Reduction; resource recovery; Scanning electron microscopy; Slags; Terminals; 扫描电子显微镜; 无色杆菌; 电子顺磁共振; 示范项目; 细胞形态; 铬回收率
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60328-9

Based on the principle of bacterial leaching and bacterial metallurgy, a novel technology for the detoxification of chromium-containing slag by Achromobacter sp. CH-1 and chromium recovery was proposed. Strain CH-1 cell morphology before and after Cr（Ⅵ） reduction was observed with a scanning electron microscope （SEM）, and the reduction product is found to adhere to terminals of CH-1 cells. Energy-dispersive X-ray （EDX） and electron paramagnetic resonance （EPR） analyses reveal that the main component of the reduction product is Cr（Ⅲ）. Furthermore, small and large-scale demonstration projects reveal that Achromobacter sp. can be used to detoxify chromium-containing slag and to selectively recover chromium by using this novel technique. Chromium recovery rate increases with decreasing particle sizes of chromium-containing slag and slagheap height. Chromium recovery rates in 10 t/batch and 20 t/batch of on-site demonstration projects for chromium-containing slag detoxification are more than 90%.