To this end, a large number of related research work has been carried out in recent years, and the more prominent research results are combined processes such as weak magnetic-strong magnetic-flotation and magnetization roasting-reverse flotation. For example, the Maanshan Mine Research Institute used a strong magnetic-positive flotation process for fine ore-positive flotation of fine ore (-15 mm) of iron ore ore (including mirror iron ore, siderite and limonite), and compared to a single intensity magnetic separation process, the iron ore grade increased 2 percentage points (up to 49%, to 58% or more after burning) while the iron metal recovery increased above 12 percent (more than 74%) .
In addition, closely combined with the characteristics of the roasting concentrate of Jiugang, avoiding the multi-section magnetic separation method and residual magnetic influence, using the re-grinding-reverse flotation and re-grinding-weakening-reverse flotation process to reduce the roasting magnetic separation concentrate Test for impurity content. Under the conditions of the selected particle size of 82%-75μm, the impurity content of SiO2+Al2O3 was reduced from 11% to less than 6%, and the grade of concentrate iron was increased from 55% to over 59% (the iron grade after burning was 60%). Above), the recovery rate of the miscellaneous work is up to 94%.
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