Effect and mechanism of siderite on reverse flotation of hematite |
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Authors: | Wan-zhong Yin Dong Li Xi-mei Luo Jin Yao Qian-yu Sun |
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Affiliation: | 1. Col ege of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China |
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Abstract: | The effects of siderite on reverse flotation of hematite were investigated using micro flotation, adsorption tests, and Fourier trans-form infrared spectroscopy. The flotation results show that interactions between siderite and quartz are the main reasons that siderite signifi-cantly influences the floatability. The interactions are attributed to dissolved siderite species and fine siderite particles. The interaction due to the dissolved species is, however, dominant. Derjaguin-Landau-Verwey-Overbeek (DLVO) theoretical calculations reveal that adhesion on quartz increases when the siderite particle size decreases and that fine particles partly influence quartz floatability. Chemical solution calcula-tions indicate that the dissolved species of siderite might convert the surface of active quartz to CaCO3 precipitates that can be depressed by starch. The theoretical calculations are in good agreement with the results of adsorption tests and FTIR spectroscopy and explain the reasons why siderite significantly influences reverse flotation of hematite. |
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Keywords: | hematite siderite reverse flotation solution chemistry |
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