高硫铝土矿微波焙烧脱硫预处理及焙烧矿高压溶出性能  

Microwave roasting desulfurization pretreatment of high-sulfur bauxite and high-pressure dissolution performance of roasted ore

作　　者：杨黔 金会心[1,2] 殷倩楠 肖媛丹 王尚杰夫 YANG Qian;JIN Huixin;YIN Qiannan;XIAO Yuandan;WANG Shangjiefu(School of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;Guizhou Provincial Key Laboratory of MetallurgicalEngineering and Process Energy Conservation,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学材料与冶金学院,贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵阳550025

出　　处：《有色金属科学与工程》2021年第5期39-45,共7页Nonferrous Metals Science and Engineering

基　　金：贵州省科学技术厅平人才项目(黔科合平台人才[2020]5021)。

摘　　要：采用微波焙烧方式研究高硫铝土矿的脱硫效果,并对焙烧脱硫后的焙烧矿进行拜耳法溶出,研究了微波焙烧条件对氧化铝溶出率的影响。结果表明,高硫铝土矿微波焙烧脱硫,焙烧温度相较于焙烧时间对脱硫率的影响更为显著,焙烧温度由100℃升高到600℃,脱硫率可平均提高约30%,而焙烧时间由2 min延长至20 min,脱硫率仅平均提高12%。在600℃焙烧20 min,可将铝土矿全硫含量由3.875%脱除至0.2235%,脱硫率达到95.11%。同时,微波焙烧温度对氧化铝的溶出率影响也较显著,随着微波焙烧温度升高,氧化铝的相对溶出率有先提高后下降的趋势,微波焙烧温度为400℃时,焙烧矿的氧化铝相对溶出率达到最大,为94.77%;当焙烧温度高于400℃时,焙烧矿会出现大量刚玉(Al2O3)相,是导致氧化铝相对溶出率下降的主要因素。In this paper,microwave roasting method was used to study the desulfurization effect of high-sulfur bauxite,and the roasted ores after roasting and desulfurization were dissolved by Bayer method,and the influence of microwave roasting conditions on the dissolution rate of alumina was studied.The results showed that as for microwave roasting desulfurization of high-sulfur bauxite,its roasting temperature had a more significant effect on the desulfurization rate than the roasting time.When the roasting temperature increased from 100℃to 600℃,the desulfurization rate could increase by about 30%on average.When the time was extended from 2 min to 20 min,the desulfurization rate only increased by about 12%on average.Roasting at 600℃for 20 min could remove the total sulfur content of bauxite from 3.875%to 0.2235%,and the desulfurization rate reached 95.11%.At the same time,the microwave roasting temperature had a significant effect on the dissolution rate of alumina.As the microwave roasting temperature increased,the relative dissolution rate of alumina tended to increase first and then decrease.When the microwave roasting temperature was 400℃,the relative dissolution rate of aluminum in the roasted ore reached the maximum up to 94.77%;when the temperature was higher than 400℃,a large amount of corundum(Al2O3)phase would appear in the roasted ore,which was the main factor leading to the decrease of the relative dissolution rate of alumina.

关 键 词：高硫铝土矿 微波焙烧 脱硫率 拜耳法溶出 氧化铝相对溶出率 

分 类 号：TF821[冶金工程—有色金属冶金]