(東北大學(xué) 材料與冶金學(xué)院，沈陽 110004)
摘 要: 采用馬弗爐、旋轉(zhuǎn)管式爐和流化床對我國高硫鋁土礦進(jìn)行焙燒預(yù)處理。考察焙燒溫度、焙燒時(shí)間對硫含量以及焙燒礦溶出性能的影響；利用SEM和XRD技術(shù)對焙燒礦的微觀形貌及晶型結(jié)構(gòu)進(jìn)行表征；探討高硫礦焙燒脫硫機(jī)理。結(jié)果表明：焙燒脫硫處理我國高硫鋁土礦是可行的，焙燒預(yù)處理礦可滿足我國氧化鋁生產(chǎn)的工業(yè)要求；馬弗爐、旋轉(zhuǎn)管式爐焙燒預(yù)處理的合適工藝條件為：焙燒溫度750 ℃，焙燒時(shí)間30 min；流化床焙燒預(yù)處理的合適工藝條件為：焙燒溫度800 ℃，焙燒時(shí)間10 min；流態(tài)化焙燒礦溶出效果最好，該焙燒礦在溶出溫度220 ℃、溶出配料分子比1.3、苛性堿濃度220 g/L的溶出條件下，礦石中氧化鋁的相對溶出率可達(dá)到93.7%。
關(guān)鍵字: 高硫鋁土礦；焙燒預(yù)處理；脫硫；溶出性能
digestion performance of roasted ore
（School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract:The high-sulfur bauxite was pretreated in muffle furnace, rotary tube furnace and fluidized bed. The effects of roasting temperature and roasting time on the desulfurization performance and digestion rate were studied. The changes in micromorphology and phase composition were analyzed and discussed by SEM and XRD, and the changing mechanism of desulfurization by roasting was tested. Digestion rate of roasted ore was also tested. The experimental results indicate that the sulfur element is successfully discharged as gas form and the sulfur content of roasted ore meets the industrial standard. The reasonable conditions of roasting pretreatment by using muffle furnace and rotary tube furnace are 750 ℃ for 30 min, and 800 ℃ for 10 min by using fluidized bed. The roasted ore by using fluidized bed has the best digestion performance. The alumina digestion rate of roasted ore by using fluidized bed reaches 93.7% at digestion temperature of 220 ℃, digestion molecule ratio of 1.3 and caustic concentration of 220 g/L.
Key words: high sulfur bauxite; roasting pretreatment; desulfurization; digestion performance
