| 低品位高硅铝土矿静态焙烧溶出 |
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| 引用本文： | 马长喜,夏飞龙,张姗姗,张强.低品位高硅铝土矿静态焙烧溶出[J].矿产综合利用,2023,44(2):7-12. |
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| 作者姓名： | 马长喜 夏飞龙 张姗姗 张强 |
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| 作者单位： | 1.商丘工学院机械工程学院，河南 商丘 476000 |
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| 基金项目： | 国家自然科学基金 低品位高硫铝土矿闪速焙烧脱硫与碱溶脱硅的调制机制（51774079）；加压酸浸锰烟尘回收锰过程选择性强化机理研究（51764007） |
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| 摘 要： | 针对低品位高硅铝土矿溶出性能差，本文采用低温静态焙烧溶出工艺，考查焙烧温度、焙烧时间及矿石粒径对氧化铝溶出效果的影响。其结果表明：矿石含铝主要物相为一水软铝石、一水硬铝，其在焙烧过程中分解温度为515℃。经过焙烧后，矿石结构变为疏松孔洞及沟壑结构。在焙烧温度600℃、焙烧时间90 s、矿石粒径150μm条件下，氧化铝相对溶出率最优，较原矿提高7.57%达到了97.88%。焙烧矿氧化铝溶出限制性环节为内扩散，其表观活化能为44.72 kJ/mol。
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| 关 键 词： | 高硅 铝土矿 焙烧 溶出 热重 |
| 收稿时间： | 2021-02-25 |
Study on Digestion of Low Grade High Silica Bauxite by Static Roasting |
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| Affiliation: | 1.College of Mechanical Engineering, Shangqiu Institute of Technology, Shangqiu, Henan, China2.Guizhou Wengfu Lantian Fluorine Chemical Co., Ltd., Guiyang, Guizhou, China3.College of Material and Metallurgy, Guizhou University, Guiyang, Guizhou, China4.Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang, Guizhou, China5.State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources, Kunming, Yunnan, China |
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| Abstract: | Aiming at the problem of poor digestion performance of alumina from low-grade high-silica bauxite, the low-temperature static roasting and digestion process was used to investigate the effects of roasting temperature, roasting time and ore size on the digestion effect of alumina. The results show that the main phases of aluminum in the ore are boehmite and diaspore, and the decomposition temperature during the roasting process is 515 ℃. After roasting, the structure of the ore becomes a porous and gully structure. Under the conditions of roasting temperature of 600 ℃, roasting time of the 90 s, and ore particle size of 150 μm, the relative digestion rate of alumina is the best, which is 7.57% higher than the raw ore to 97.88%. The limiting link of alumina dissolution from calcined ore is internal diffusion, and its apparent activation energy is 44.72 kJ/mol. |
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