(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 提出CH-1菌解毒鉻渣及回收鉻資源的新工藝。采用掃描電鏡、透射電鏡以及能量彌散X 射線分析(EDXA)和電子順磁共振(EPR)等分析手段對(duì)還原反應(yīng)前后細(xì)菌細(xì)胞形貌進(jìn)行觀察，并對(duì)還原反應(yīng)沉淀產(chǎn)物的元素組成進(jìn)行定性分析，研究并計(jì)算了示范工程中鉻的回收率及平衡。結(jié)果表明Cr(VI)的還原反應(yīng)在細(xì)菌體外發(fā)生，反應(yīng)產(chǎn)物的主要組成元素為Cr3+，反應(yīng)產(chǎn)物成分為Cr(OH)3。鉻渣中90%以上的Cr(Ⅵ)以Cr(OH)3淤泥的形式得以回收，20 t/批規(guī)模的示范工程可回收Cr(OH)3 (含量32.8%) 淤泥694.2 kg，實(shí)現(xiàn)鉻的再生，并從根本上消除鉻渣的污染問(wèn)題。
關(guān)鍵字: 鉻渣；回收鉻；CH-1菌
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:A novel technology of chromium recovery from chromium-containing slag by Achromobacter sp. CH-1 based on the principle of bacterial leaching and bacteriosmelt was 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 to analyze the elemental composing of precipitate product during the process. Recovery rate and balance of chromium in demonstration projects were investigated and calculated. The results indicate that the major element composing precipitate is trivalent chromium, which implies that the reduction product is Cr(OH)3. More than 90% Cr(VI) in chromium-containing slag is recovered in the form of Cr(OH)3-containing sludge. 694.2 kg sludge containing Cr(OH)3 (mass fraction of 32.8%) are recovered, which eliminates the pollution of chromium-containing slag thoroughly.
Key words: chromium-containing slag; chromium recovery; Achromobacter sp. CH-1
