西南地区某高泥堆积型铝土矿选矿试验研究

西南地区某高泥堆积型铝土矿中Al₂O₃、SiO₂含量分别为47.25%、10.86%，铝硅比为4.35；主要目的矿物为硬水铝石，主要脉石矿物为高岭石，其他金属矿物有赤铁矿、针铁矿以及锐钛矿等。矿石中矿物的共生关系较为复杂，目的矿物嵌布粒度不均，单体解离度不高；铁、钛矿物与铝矿物之间紧密共生，难于实现有效分离。针对该矿石采用全泥正浮选的选矿工艺，以氢氧化钠为调整剂、水玻璃为抑制剂，EMB-506为捕收剂，在磨矿细度为-0.074 mm占70%的条件下，闭路试验可获得Al₂O₃品位为51.62%，SiO₂品位为6.05%，铝硅比为8.53，Al₂O₃回收率为86.66%的浮选精矿。该工艺流程结构及浮选药剂制度简单，所得浮选精矿达到了拜耳法生产氧化铝对给料的要求。

Experimental Study on Beneficiation of a High Mud Accumulation Type Bauxite in Southwestern District

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.