Cites 2016

Hydrochloric acid leaching for upgrading flotation concentrate from a low-grade bauxite ore

Luzheng Chen 2  ,  
Wei Sun 4,  
Central South University Sichuan Non-ferrous Technology Group Co., Ltd
Faculty of Land Resource Engineering, Kunming University of Science and Technology
Kunming University of Science and Technology
Central South University
Physicochem. Probl. Miner. Process. 2017;53(2):1038–1046
Publish date: 2017-05-07
Bauxite is the major raw material for alumina production, and its Al2O3 grade improvement or desilication is a necessary process for production of high-grade alumina concentrates from bauxite ores. In practice, flotation presents an effective method for the processing of such ores. However, it is not sufficient to produce a concentrate product with high Al2O3 grade from the ores with a single flotation process, especially from these containing abundant carbonate minerals. In this investigation, hydrochloric acid leaching was used to remove dolomite impurity from the flotation concentrate of a bauxite ore, to improve its Al2O3 grade and Al2O3/SiO2 (A/S) ratio. Effects of three dominant parameters on the leaching performance, that is leaching time, leaching temperature and hydrochloric acid concentration, were investigated in details. When these parameters were optimized, the aluminum concentrate assaying 67.41% Al2O3 with 66.84% recovery and 7.44 A/S ratio was obtained from the bauxite ore assaying 42.94% Al2O3 with 2.48 A/S ratio. It was concluded that hydrochloric acid leaching proved an effective method for upgrading of flotation concentrate from a low-grade bauxite ore containing carbonate minerals.
Luzheng Chen   
Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, Yunnan Province, China, 650093 Kunming, China
1. FENG, Q. M., LU, Y. P., OU, L. M., ZHANG, G. F., 2008, Beneficiation Practice of Bauxite, Metal. Mine., 10, 1-12.
2. HHANG, C. B., ZHANG, L., WANG, Y. H., LAN, Y., 2008, Separation of aluminosilicates and diaspore from diasporic-bauxite by selective flocculation, J. Cent. South Univ. T. 15, 520-525.
3. HYUN, J., ENDOH, S., MASUDA, K., SHIN, H., OHUA, H. S., 2005, Reduction of chlorine in bauxite residue by fine particle separation, Int. J. Miner. Process. 76, 13-20.
4. JIANG, Y. R., XUE, Y. L., CAO, X. F., XIA, Z., 2001, Distribution behavior of collector in the desilication system of bauxite flotation, J. Cent. South Univ. T. 8, 125-129.
5. JIANG, Y. R., ZHAO, B. N., ZHOU, X. H., ZHOU, L. Y., 2010, Flotation of diaspore and aluminosilicate minerals applying novel carboxyl hydroxamic acids as collector, Hydrometallurgy, 104, 112–118.
6. LI, G., LI, Z. H., MA, H. W., 2013, Comprehensive use of dolomite-talc ore to prepare talc, nano-MgO and lightweight CaCO3 using an acid leaching method, Appl. Clay Sci. 86, 145-152.
7. LIU, Y., LIU, Q., 2004, Flotation separation of carbonate from sulfide minerals, I: Flotation of single minerals and mineral mixtures, Miner. Eng. 17, 855-863.
8. LUSTY, P. A. J., GUNN, A. G., 2016, Chanllenges to global mineral resource security and options for future supply, Global Miner. Res. Security, 393, 265-176.
9. MASSOLA, C. P., CHAVES, A. P., LIMA, J. R. B., ANDRADE, C. F., 2009, Separation of silica from bauxite via froth flotation, Miner. Eng. 22, 315-318.
10. MA, J. Y., LI, Z. B., XIAO, Q. G., 2012, A new process for Al2O3 production from low-grade diasporic bauxite based on reactive silica dissolution and stabilization in NaOH-NaAl(OH)4 media, Aiche J. 58, 2180-2191.
11. MA, S. H., WEN, Z. G., CHEN, J. N., 2009, An environmentally friendly design for low-grade diasporic-bauxite processing, Miner. Eng. 22, 793-798.
12. MENDELOVICI, E., 2004, Acid and thermal treatments of lateritic bauxites, J. Therm. Anal. Calorim. 75, 957-964.
13. PAN, X. L., YU, H. Y., DONG, K. W., TU, G. F., BI, S. W., 2012, Pre-desilication and digestion of gibbsitic bauxite with lime in sodium aluminate liquor, Int. J. Min. Met. Mater. 19, 973-977.
14. REDDY, B. R., MISHRA, S. K., BANERJEE, G. N., 1999, Kinetics of leaching of a gibbsitic bauxite with hydrochloric acid, Hydrometallurgy, 51, 131-138.
15. VIKTOR, L. R., ILYA, Z. P., VIKTOR, M. S., 2003, Extracting Silica and Alumina from Low-Grade bauxite, Jom, 55, 47-50.
16. WANG, Y., HU, Y., HE, P., GU, G., 2004, Reverse flotation for removal of silicates from diasporic-bauxite. Miner. Eng. 17, 63-68.
17. YILDIRIM, M., 2008, Dissolution Kinetics of Icel-Aydincik Dolomite in Hydrochloric Acid, S. Afr. J. Chems. -Afr. T., 61, 127-132.
18. ZHAO, A. C., LIU, Y., ZHANG, T. A., LU, G. Z., DOU, Z. H., 2013, Thermodynamics study on leaching process of gibbsitic bauxite by hydrochloric acid, Trans. Nonferrous Met. Soc. China, 23, 266-270.
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