南川地区高硫铝土矿稀相输送床焙烧特征  

Roasting characteristics of Nanchuan high sulfur bauxite in dilute-phase conveying bed

作　　者：赵博[1] 陈延信[1] 酒少武[1] 韩丁 ZHAO Bo;CHEN Yan-xin;JIU Shao-wu;HAN Ding(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《中国有色金属学报》2021年第12期3645-3654,共10页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2016YFB0303400)。

摘　　要：在稀相输送床焙烧装置中对全硫质量分数为1.35%的高硫铝土矿进行焙烧脱硫,通过对焙烧前后铝土矿中硫物相、矿物组成、微观和宏观结构及氧化铝溶出效果的分析,探讨焙烧温度对脱硫效率和焙烧矿加工性能的影响规律。结果表明:输送床低温焙烧可实现高硫铝土矿在数秒内快速脱硫,输送床中含水矿物的脱水反应进程明显滞后于脱硫反应进程,与堆积态热分析结果有明显区别;FeS_(2)脱硫反应伴随着Fe_(2)O_(3)吸收SO_(2)的反应,高温又使得硫酸盐分解;输送床快速焙烧-冷却方式大幅度增加了焙烧矿的比表面积,同时使Al-O矿物微晶尺寸细化,有利于Al_(2)O_(3)溶出;在试验设定的焙烧温度范围内,温度与脱硫率、Al_(2)O_(3)溶出率正相关;综合考虑焙烧能耗和焙烧矿的溶出性能,高硫铝土矿的焙烧温度宜选取在600℃左右,硫化物型硫质量分数可以降低到0.01%,氧化铝相对溶出率可以达到99%以上。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 FeS_(2) accompanies the absorbing of SO_(2) by Fe_(2)O_(3),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 Al_(2)O_(3).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%.

关 键 词：高硫铝土矿 稀相输送床 脱硫率 相对溶出率 

分 类 号：TF803.1[冶金工程—有色金属冶金]