Effect of organic flocculant on settling performance of iron-bearing minerals and its adsorption mechanism

被引：0
|
作者：
Lu T. [1 ,2 ,3 ]
Pan X. [1 ,2 ,3 ]
Wu H. [1 ,2 ,3 ]
Li Y. [1 ,2 ,3 ]
Yu H. [1 ,2 ,3 ]
机构：
[1] Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Liaoning, Shenyang
[2] School of Metallurgy, Northeastern University, Liaoning, Shenyang
[3] Key Laboratory for Recycling of Nonferrous Metal Resources (Shenyang), Liaoning, Shenyang
来源：
Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 09期
关键词：
adsorption; flocculation; goethite; hematite; particle size distribution; sedimentation;
D O I：
10.11949/0438-1157.20220405
中图分类号：
学科分类号：
摘要：
The effect of ammonium polyacrylate (PAAA), anionic polyacrylamide (APAM) and hydroxamic acid flocculant (HPAM/HCPAM) on the settling performance of hematite and goethite by simulating the Bayer red mud settlement was studied, and the particle size distribution and fractal dimension of flocs as well as the flocculation mechanism were analyzed by Fourier transform infrared spectroscopy. Among the different types of flocculants, the iron ore phase sedimentation rate is the fastest with the addition of hydroxamic acid flocculant, and the higher the hydroxamic acid content, the better the sedimentation performance; the ammonium polyacrylate and anionic polyacrylamide flocculants have little effect on the settling performance of iron-bearing minerals; under the same conditions, the settling velocity of hematite is much higher than that of goethite, and increasing the amount of flocculant helps to improve the settling velocity of goethite. Among the hematite flocs, the PAAA flocs have the largest particle size, while the HPAM flocs have the largest fractal dimension and the best compactness; among the goethite flocs, the APAM flocs have the largest particle size, while the HCPAM flocs have the largest fractal dimension and the best compactness. The hydroxamic acid flocculant forms a five membered ring chelate with a stable structure and strong adsorption capacity with hematite and goethite, which enhances the flocculation performance of hematite and goethite; PAAA is adsorbed with hematite through bidentate bridging, and adsorbed with goethite through monodentate coordination, the adsorption capacity of which is weaker than five-membered ring; APAM adopts the chemical adsorption with hematite and goethite with a poor settling performance. © 2022 Chemical Industry Press. All rights reserved.
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页码：4122 / 4132
页数：10
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共 41 条
  • [1] Bi S W, Yu H Y, Yang Y H., Production Technology of Alumina, (2007)
  • [2] Fei X J., Hydraulics of Transporting Slurry and Granular Material, (1994)
  • [3] Pan X L, Yu H Y, Tu G F, Et al., Effect of lime on digestion of gibbsitic bauxites at low temperature, Journal of Northeastern University (Natural Science), 34, 4, pp. 551-555, (2013)
  • [4] James D F, Blakey B., Comparison of the rheologies of laterite and goethite suspensions, Korea-Australia Rheology Journal, 16, pp. 109-115, (2004)
  • [5] Shrimali K, Jin J Q, Hassas B V, Et al., The surface state of hematite and its wetting characteristics, Journal of Colloid and Interface Science, 477, pp. 16-24, (2016)
  • [6] Li L Y., A study of iron mineral transformation to reduce red mud tailings, Waste Management, 21, 6, pp. 525-534, (2001)
  • [7] Zhou G T, Wang Y L, Qi T G, Et al., Low-temperature thermal conversion of Al-substituted goethite in gibbsitic bauxite for maximum alumina extraction, RSC Advances, 12, 7, pp. 4162-4174, (2022)
  • [8] Sun Q, Huang H G., Method for sovling the problem about too much solid in the solution in red mud separation thickener of Bayer process, China Nonferrous Metallurgy, 33, 2, pp. 9-10, (2004)
  • [9] Fang C, Yang S, Wu Y, Et al., Effect of floc surface morphology on membrane pollution prediction, CIESC Journal, 71, 2, pp. 715-723, (2020)
  • [10] Li J Y, Zhang Z G, Sun C B, Et al., A review of flocculation theories incorporating fractal geometry, Chemical Industry and Engineering Progress, 31, 12, pp. 2609-2614, (2012)
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