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Polyaspartic acid, an eco-friendly regulator for the improvement of coking coal flotation: applications and mechanism
Zhu, Zhanglei1; Zhao, Bohui1; Tian, Chengchi1; Sheng, Qiuyue1; Li, Zhen1; Zhang, Ningning1; Wang, Jizhen1; Yang, Xiaohui2
2024-02-29
摘要In this study, a novel approach is to apply polyaspartic acid (PASP) as an eco-friendly regulator for the flotation of coking coal, which is different from the conventional use of oil collectors only. Flotation trails showed that adding PASP contributes to a two-way improvement in the yield and ash content of clean coal. SEM-EDS observations directly revealed that adding PASP significantly reduces the coating of high-ash fine slimes on the surface of low-ash coal particles. Contact angle detections and zeta potential analysis presented that the preferential adsorption of PASP hardly affects the adsorption of sodium oleate (NaOL) on the surface of low-ash coal particles but significantly weakens the adsorption of NaOL on the surface of high-ash fine slimes, leading to a remarkably hydrophobic difference. Particle interaction energy calculations verified that adding PASP enlarges the energy barrier between low-ash coal particle and high-ash fine slime. Hence, it can be arrived that the preferential adsorption of PASP affects the adsorption of NaOL on the surface of high-ash fine slime, widens the hydrophobic difference, enlarges the energy barrier between low-ash coal particle and high-ash fine slime, reduces the high-ash fine slime coating, therefore leading to a better flotation performance of lean coal.
关键词Lean coal flotation polyaspartic acid slime coating flotation perfect index
DOI10.1080/19392699.2024.2313589
发表期刊INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
ISSN1939-2699
页码20
通讯作者Li, Zhen(zell@xust.edu.cn) ; Zhang, Ningning(ningningzhang@xust.edu.cn) ; Yang, Xiaohui(yangxiaohui@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001173998400001
语种en