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| Stepwise flotation desulfurization and desilication process for sedimentary high-sulfur bauxite |
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Received:March 26, 2025
Revised:April 21, 2025
Accepted:April 21, 2025
Published Online:April 30, 2026
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| DOI：10.3969/j.issn.1005-7854.2026.02.007 |
| KeyWord:sedimentary high-sulfur bauxite;diaspore;pyrite;stepwise flotation;desulfurization;desilication;alumina-silica ratio;reagent regime |
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| Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China |
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| Abstract: |
| China is abundant in bauxite resources; however, sedimentary high-sulfur bauxite is difficult to be directly utilized for alumina production due to its high sulfur and silicon impurity contents. This paper focuses on a sedimentary high-sulfur bauxite sample from Guizhou Province. Based on process mineralogy analysis, a stepwise flotation process for desulfurization and desilication was investigated. Multi-element analysis shows that the main chemical compositions of the ore are Al2O3 58.55%, SiO2 14.95%, and S 3.02%, with an alumina-silica ratio (A/S) of 3.92. The major minerals are diaspore and pyrite, along with minor gibbsite, and associated clinochlore, gypsum, and anhydrite. The optimal grinding fineness was determined as 90% passing ?0.074 mm. Desulfurization flotation adopted a flowsheet of "one roughing, two cleaning, and two scavenging". Under the optimum reagent regime—copper chloride 400 g·t?1, butyl xanthate 100 g·t?1, and terpineol oil 20 g·t?1—a sulfur concentrate with a sulfur grade of 39.51% and sulfur recovery of 89.36% was obtained, achieving a desulfurization rate of 92.47%. The desulfurized bauxite was subsequently subjected to reverse flotation desilication using a "two roughing, one cleaning, and two scavenging" flowsheet. With starch dosage of 300 g·t?1, polyethylene oxide 100 g·t?1, and dodecylamine 100 g·t?1, an aluminum concentrate was finally produced, achieving a yield of 66.76%, an Al2O3 grade of 65.96%, an Al2O3 recovery of 75.21%, an A/S ratio of 6.06, and a sulfur content of 0.33%. The results demonstrate that the stepwise flotation desulfurization and desilication process can achieve efficient separation and recovery of pyrite and alumina resources, providing a technical reference for the comprehensive utilization of similar sedimentary high-sulfur bauxite resources in Guizhou. |
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