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A foreign bauxite, ore containing Al 2 O 3 was 38.5%, SiO 2 of 8.5%, Fe 2 O 3 24.4% alumina-silica ratio of 4.5. Satisfactory results can be obtained by using the washing-magnetic separation-flotation combined process. The bauxite concentrate contains Al 2 O 3 51.2%, SiO 2 5.7%, aluminum to silicon ratio of 9.0, and aluminum recovery rate of 48.9%. The material can be used as a raw material produced by the Bayer process. A secondary concentrate containing 37% Al 2 O 3 , 13.6% SiO 2 and an aluminum recovery rate of 36.9% is still available. The magnetic part is magnetically selected to obtain an iron concentrate containing Fe 50.1%.
China's Yangquan bauxite is one of the high-alumina bauxite bases, and the ore produced is a diaspore-kaolinite type. The ore contains A l2 O 3 63%～65%, SiO 2 15%～16%, Fe 2 O 3 1.37%～1.44%, TiO 2 2.82%, and adopts the floating-magnetic combined process for small and semi-industrial tests. Good results. Which concentrates containing Al 2 O 3 74% ~ 75 % ( equivalent to 86.5% of clinker) containing Fe 2 O 3 <1%, and Al2O3-containing impurities have reached the ministerial standards grade metallurgical former portion for Baosteel's product requirements for high-alumina bauxite; and the tailings after sorting can still be used as raw materials for secondary bismuth bauxite.
Central South University of Technology to Guangxi Pingguo Na bean ore, the original ore contains Al 2 O 3 56.17%, SiO 2 5.90%, Fe 2 O 3 19.64%, aluminum to silicon ratio 9.52. Direct magnetic separation of raw ore can reduce the content of Fe 2 O 3 to 8.59% to 6.97%, the recovery rate of aluminum concentrate is 82.62% to 78.25%, and the ratio of aluminum to silicon increases to 11.63 to 11.06.
Beneficiation technology of high-speed iron bauxite
The content and type of iron ore or embedded distribution characteristics, which is not the same method for iron. Common methods include magnetic separation, roasting magnetic separation, floating magnetic filtration, and current-carrying flotation.