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| Study on selective grinding of high silica bauxite and desilication of Suspended Vibration Cone Concentrator |
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Received:September 28, 2024
Revised:November 04, 2024
Accepted:November 18, 2024
Published Online:August 05, 2025
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| DOI： |
| KeyWord:bauxite ; desilication ; selectivity grinding; suspended vibration cone concentrator |
| Author | Institution |
| GUO Minglong |
Faculty of Land and Resources Engineering,Kunming University of Science and Technology |
| YANG Bo |
Kagis Technology Co., Ltd. of Kunming University of Science & Technology |
| FENG Dongxia |
Faculty of Land and Resources Engineering,Kunming University of Science and Technology |
| DONG Meng |
Faculty of Land and Resources Engineering,Kunming University of Science and Technology |
| LUO Xuanxu |
Faculty of Land and Resources Engineering,Kunming University of Science and Technology |
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| Abstract: |
| The content of Al2O3 in a bauxite mine in Henan is 54.95 %, which mainly exist in the form of diaspore and kaolinite, and the intergrowth particle size is relatively fine, the Al / Si ratio is only 2.71 due to the high SiO2 content. In order to reduce the content of SiO2 in the raw ore to increase the ratio of aluminum to silicon, based on the large difference in the grindability of diaspore and gangue minerals in bauxite, the selective grinding of the bauxite was studied, Then, the fine particle gravity separation equipment suspended cone concentrator is used to separate and desilication. Under the optimal conditions of ball mill steel ball filling rate of 37 %, steel ball ratio of Φ30 mm ∶ Φ25 mm ∶ Φ20 mm ∶ Φ18 mm of 24 : 26 : 16 : 34 and grinding concentration of 60 %, through the ' selective grinding-screening ' process, the grinding fineness of-0.074 mm accounts for 75 %, and the screening particle size of + 0.25 mm can be obtained. Without separation, only through the ' selective grinding-screening ' process, the high-quality rough concentrate with Al / Si ratio of 7.86 and Al2O3 recovery of 20.6 % can be produced. The desilication rate is as high as 92.9 %. While reducing the grinding energy consumption, it also reduces the processing capacity pressure of subsequent separation and desilication, which proves the feasibility and necessity of ' selective grinding-screening ' process before separation. Under the optimum conditions of vibration frequency of 14.5 Hz, rotation frequency of 48 Hz and ore mass fraction of 25 %, the concentrate with Al / Si ratio of 6.42 and Al2O3 recovery of 33.03 % can be separated from the product of-0.25 mm, and the desilication rate is 78.61 %, which proves that the suspended cone concentrator has a good effect on the treatment of this kind of very low Al / Si ratio bauxite. After the bauxite is desilicated by the process of ' selective grinding-screening-desilication of suspended cone concentrator ', the aluminum-silicon ratio of the comprehensive crude concentrate can be increased to 6.90, and the desilication rate is 78.61 %. The overall desilication effect is good. This study provides a new way to alleviate the shortage of high quality bauxite resources and make full use of a large number of low grade bauxite resources in China. |
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