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| Dispersion behavior and mechanism of micro-fine particle low-grade iron tailings |
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Received:February 04, 2021
Revised:February 09, 2021
Accepted:February 10, 2021
Published Online:June 29, 2021
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| DOI： |
| KeyWord:iron tailings; dispersion; hematite; quartz; zeta potential |
| Author | Institution |
| CHEN Zi-yang |
Faculty of Land Resource Engineering,Kunming University of Science and Technology |
| JIANG Jing-hang |
Faculty of Land Resource Engineering,Kunming University of Science and Technology |
| YE Guo-hua |
Faculty of Land Resource Engineering,Kunming University of Science and Technology |
| TAO Yuan-yuan |
Faculty of Land Resource Engineering,Kunming University of Science and Technology |
| TANG Yue |
Faculty of Land Resource Engineering,Kunming University of Science and Technology |
| HU Yu-jie |
Faculty of Land Resource Engineering,Kunming University of Science and Technology |
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| Abstract: |
| To strengthen the selective flocculation separation of micro-fine particle iron tailings, the dispersion behavior and mechanism of mineral particles under different conditions were studied. The effects of stirring speed, stirring time and dispersant dosage on the dispersion behavior of low-grade, micro-fine particle iron tailings with hematite and quartz as the main mineral components were investigated by single factor method. The results show that speeding up the stirring speed, prolonging the mixing time and adding dispersant are helpful to the dispersion of pulp. Compared with the other two groups of dispersants, (sodium silicate + ammonium sulfate) has the best dispersing effect, and the optimal dosage is the lowest. In addition, the effect of (sodium silicate + ammonium sulfate) on the surface potential of hematite and quartz was investigated, and the dispersion mechanism was analyzed from the perspective of solution chemistry and EDLVO. It is found that SiO(OH)3－ hydrolyzed by sodium silicate is adsorbed on the mineral surface, which increases the electrostatic repulsion force and steric repulsion force between mineral particles. In addition, ammonium sulfate combined with sodium silicate can not only increase the content of SiO(OH)3－ but also disperse the slime. The combination of the two has a positive synergistic dispersion effect, which makes the dispersion system more stable. |
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