Influence of inorganic salt on flotation froth stability of coal fly ash

被引：0
|
作者：
Ran, Jin-Cai [1 ]
Li, Guo-Sheng [1 ]
Cao, Yi-Jun [2 ]
Liu, Chang [3 ]
机构：
[1] School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou
[2] National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou
[3] Pingdingshan Branch, Beijing Huayu Engineering Co., Ltd., Pingdingshan
来源：
Meitan Xuebao/Journal of the China Coal Society | 2015年 / 40卷 / 03期
关键词：
Carbon removal; Coal fly ash; Flotation; Foam stability; Inorganic salt;
D O I：
10.13225/j.cnki.jccs.2014.0473
中图分类号：
学科分类号：
摘要：
Specific nature property of mineral composition in coal fly ash is the key factor to depress froth stability of unburned carbon flotation. This study intends to improve froth stability via the addition of inorganic salt cations. Three different inorganic salt cations (Na+, Mg2+, Fe3+) were added into both solutions with only frother and flotation pulp system with ash particles. The influence of inorganic salt cations on foam and froth stability was studied systematically. The results indicate that the addition of salt cations improves the stability of gas-liquid foam and gas-liquid-solid froth. The stabilization function of Fe3+ to the foam or froth is stronger than Mg2+ and Na+. Based on the above study, the flotation of coal fly ash from Hubei province of China was conducted. Compared with flotation system with no salt cations, the LOI of low carbon product could be reduced from 8.85% to 5.57% in the flotation system with 3 mmol/L Fe3+. The unburned carbon removal rate of low carbon product is improved from 41.94% to 74.55%. Compared with flotation system with Fe3+, the function of Mg2+ and Na+ to the floatation indexes is weakened in due order. ©, 2015, Meitan Xuebao/Journal of the China Coal Society. All right reserved.
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页码：646 / 651
页数：5
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