关键词: 铝土矿, 高泥含量, 正浮选, 脱硅, EMB-506, 铝硅比

Abstract: The Al₂O₃ and SiO₂ contents in a high mud accumulation type bauxite in southwest district are 47.25% and 10.86%,respectively,and the Al to Si ratio is 4.35.The main target mineral is diaspore,the main gangue mineral is kaolinite,and other metallic minerals are hematite,goethite and anatase.The symbiotic relationship of minerals in ores is complicated,and the particle size of target minerals is uneven with the low monomer dissociation degree.The iron,titanium minerals and aluminum minerals is in complicated symbiotic relationship,leads to the difficult in effective separation.The dressing process of full mud flotation was selected with sodium hydroxide as regulator,sodium silicate as inhibitor,EMB-506 as collector.Under the condition of grinding fineness of -0.074 mm accounting for 70%,flotation concentrate with Al₂O₃ grade of 51.62%,Al₂O₃ recovery rate of 86.66%,SiO₂ grade of 6.05%,Al to Si ratio of 8.53 could be obtained by closed-circuit test.The process structure and flotation reagent system are simple,and the flotation concentrate obtained can meet the requirements of alumina feeding in Bayer process.

Key words: bauxite,high slime contents,positive flotation,desilication,EMB-506,ratio of aluminum and silicon