贵州某鲕状赤铁矿选矿试验研究

Beneficiation Experimental Research on a Refractory Oolitic Hematite of Guizhou Province

贵州某鲕状赤铁矿铁矿物嵌布粒度极细,镜下观察大都在10μm以下,鲕状结构中无明显鲕核或以脉石矿物为鲕核。对该矿石进行选矿试验研究,结果表明:常规物理选矿方法无法使该矿石得到有效分选。采用磁化焙烧—磁选流程,能得到铁品位为55.74%,对焙烧矿铁回收率为57.11%的铁精矿精矿,但磷含量为0.258%;对磁化焙烧—磁选所得铁精矿进行酸浸降磷,可使精矿磷含量降至0.065%,并使铁品位提高到57.73%,精矿对焙烧矿的铁回收率为50.81%。

A high-phosphorus oolitic hematite minerals in Guizhou province,embedded in fine particle size.The hematite particle size are less than 10 micron observed by microscope,and the oolitic structure with no obvious nuclear or gangue mineral nuclear appeared.The beneficiation tests on this iron ore were carried out.The results showed that the traditional beneficiation method can not effectively separate the ores.And through the magnetic roasting-magnetic separation process,an iron concentrate with 55.74% Fe grade and 57.11% Fe recovery could be obtained, however, the content of phosphorus are high up to 0. 258% in iron concentrate. The iron concentrate o/drained by magnetic roasting-Magnetic separation was leached by sulphuric acid. Then, the P grade was decreased to 0. 065%, Fe grade was increased to 57.73% with a 50.81% total recovery.