(西安建筑科技大學(xué) 材料科學(xué)與工程學(xué)院，西安 710055)
摘 要: 在稀相輸送床焙燒裝置中對全硫質(zhì)量分?jǐn)?shù)為1.35%的高硫鋁土礦進行焙燒脫硫，通過對焙燒前后鋁土礦中硫物相、礦物組成、微觀和宏觀結(jié)構(gòu)及氧化鋁溶出效果的分析，探討焙燒溫度對脫硫效率和焙燒礦加工性能的影響規(guī)律。結(jié)果表明：輸送床低溫焙燒可實現(xiàn)高硫鋁土礦在數(shù)秒內(nèi)快速脫硫，輸送床中含水礦物的脫水反應(yīng)進程明顯滯后于脫硫反應(yīng)進程，與堆積態(tài)熱分析結(jié)果有明顯區(qū)別；FeS2脫硫反應(yīng)伴隨著Fe2O3吸收SO2的反應(yīng)，高溫又使得硫酸鹽分解；輸送床快速焙燒-冷卻方式大幅度增加了焙燒礦的比表面積，同時使Al-O礦物微晶尺寸細(xì)化，有利于Al2O3溶出；在試驗設(shè)定的焙燒溫度范圍內(nèi)，溫度與脫硫率、Al2O3溶出率正相關(guān)；綜合考慮焙燒能耗和焙燒礦的溶出性能，高硫鋁土礦的焙燒溫度宜選取在600 ℃左右，硫化物型硫質(zhì)量分?jǐn)?shù)可以降低到0.01%，氧化鋁相對溶出率可以達到99%以上。
關(guān)鍵字: 高硫鋁土礦；稀相輸送床；脫硫率；相對溶出率
（College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China）
Abstract:High sulfur bauxite with total sulfur mass fraction of 1.35% was roasted in the dilute phase conveying bed. Through analyzing the sulfur phase, mineral composition, micro and macro structure, and alumina digestion effect in the bauxite ore and roasted bauxite, the influences of roasting temperature on desulfurization efficiency and digestion performance of roasted ore were discussed. The result shows high sulfur bauxite can be desulfurized in a few seconds by roasted in the conveying bed at relative low-temperature, meanwhile, the mineral dehydration reaction process falls behind the desulfurization reaction process obviously, which is obviously different from the thermal analysis results on stacked state. Desulfurization of FeS2 accompanies the absorbing of SO2 by Fe2O3, and sulfate decomposes at high temperature. The specific surface area of roasted ore greatly increases and the micro crystal of Al-O mineral refines, which is conducive to the digestion of Al2O3. Within a certain range of roasting temperature, the desulfurization rate and digestion rate of alumina increase with increasing the temperature，and the roasting temperature of high-sulfur bauxite can be selected at 600 ℃ due to the appropriate roasting energy consumption and the digestion performance of roasted ore. The mass fraction of sulfide sulfur decreases to 0.01%, and the relative digestion rate of alumina can exceed 99%.
Key words: high sulfur bauxite; dilute-phase conveying bed; desulfurization rate; relative digestion rate
