Migration of lithium, gallium and rare earth elements in coal, coal slime, and coal gangue during combustion

被引：0
|
作者：
Ma Z. [1 ]
Zhang S. [1 ]
Shan X. [1 ]
Guo Y. [1 ]
Cheng F. [1 ]
机构：
[1] State Environmental Protection Key Laboratory on Efficient Resource-utilization Techniques of Coal Waste, Collaborative Innovation Center of High Value-added Utilization of Coal-relate Waste, Institute of Resources and Environmental Engineering of Shanxi U
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 06期
关键词：
Coal combustion; Enrichment; Migration; Sustainability; Valuable rare elements; Waste treatment;
D O I：
10.11949/0438-1157.20201544
中图分类号：
学科分类号：
摘要：
Mastering the migration of valuable rare elements in coal during combustion is of great significance to the utilization of valuable elements in coal. Four coal samples with high aluminum content, coal slime, and two coal gangue samples were used in this work. The combine form of lithium (Li), gallium (Ga) and rare earth elements (REE) in these samples was analyzed using a stepwise chemical extraction method. We investigated the escape of Li, Ga, and REE during coal combustion between 300 and 1100℃ and their enrichment behavior in ash. The correlation between migration of rare elements and composition characteristics of coal samples was also discussed. The results showed that Li, Ga and REE in these coal samples were mainly in form of silicate. The escape ratio of these elements during coal combustion was negatively correlated with the ash content in coal, and positively correlated with volatile matter and carbon content. These elements are concentrated in different degrees in ash, and the enrichment efficiency of REE is higher than that of Li and Ga. The higher the content and volatile content of trace elements in the raw materials and the lower the ash content, the higher the content of trace elements in the ash obtained under the same combustion conditions. © 2021, Editorial Board of CIESC Journal. All right reserved.
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页码：3349 / 3358
页数：9
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