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中南大学学报(自然科学版)

Journal of Central South University

第40卷    第2期    总第186期    2009年4月

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文章编号:1672−7207(2009)02−0268−07
金属离子对一水硬铝石和高岭石浮选行为的影响
周瑜林,王毓华,胡岳华,孙大翔,喻明军

(中南大学 资源加工与生物工程学院,湖南 长沙,410083)

摘 要: 通过一水硬铝石和高岭石纯矿物的浮选试验和动电位测定,研究不同种类的金属离子对一水硬铝石和高岭石浮选行为的影响。研究结果表明:Na+和K+对这2种矿物的可浮性和表面电位影响很小;Ca2+和Mg2+对一水硬铝石可浮性影响不大,却显著活化了高岭石的浮选,特别是在碱性范围内,高岭石的浮选回收率从40%提高到了90%以上;Ca2+和Mg2+显著降低了2种矿物表面的电位绝对值,但基本不改变2种矿物的等电点。Al3+和Fe3 +对2种矿物可浮性和表面电性的影响行为不同,Fe3+对一水硬铝石和高岭石的可浮性影响不大;当pH=4~8时,Al3+对高岭石抑制作用相当明显,形成一个低谷;Al3+增加了一水硬铝石和高岭石表面的Zeta电位,使一水硬铝石的等电点由7.2变为8.5,高岭石的等电点则由4.8变为9.0。

 

关键字: 金属离子;一水硬铝石;高岭石;浮选

Influence of metal ions on floatability of diaspore and kaolinite
ZHOU Yu-lin, WANG Yu-hua, HU Yue-hua, SUN Da-xiang, YU Ming-jun

School of Resources Processing and Bio-engineering, Central South University, Changsha 410083, China

Abstract: The influences of several metal ions on the flotation of diaspore and kaolinite were investigated by flotation experiments and measurement of zeta potential. The results show that there are little influences of Na+ and K+ on the flotability and zeta potentials of diaspore and kaolinite. Ca2+ and Mg2+ also show little influences on the flotability of diaspore, but they can activate the flotation of kaolinite especially during the alkaline pH region, and the flotation recovery of kaolinite is raised from 40% to 90%. The absolute values of Zeta potential of both minerals are reduced to a very low value close to zero both in the presence of Ca2+ and Mg2+, but the isoelectric points (IEPs) of both minerals are not changed almost. Al3+ and Fe3+ have different effects on the flotability and Zeta potentials of the both minerals. There is a little effect of Fe3+ on the flotability of the both minerals. However, the depression effect of Al3+ on the flotation of kaolinite is very obvious and a valley point of the flotation is formed during the pH region of 4 to 8. Al3+ can increase the Zeta potentials of kaolinite and diaspore, and the IEP of diaspore shifts from 7.2 to 8.5, and that of kaolinite also shifts from 4.8 to 9.0.

 

Key words: metal ions; diaspore; kaolinite; flotation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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