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镜铁矿因为矿物组成复杂、嵌布粒度细微,是一种难选矿,因此对其细粒粉矿,采用回转窑进行磁化焙烧—磁选试验研究。试验结果表明,原矿焙烧效果良好,在细磨至-0.074 mm占85%,磁选强度为144 k A/m的工艺条件下,磁选精矿的铁品位仅为55.22%,显微镜分析结果表明,磁铁矿未充分单体解离,影响精矿铁品位。通过分析焙烧过程中含铁矿物的物相及其微观结构,表明原矿经过磁化焙烧,菱铁矿、褐铁矿及其大多镜铁矿已经转变成磁铁矿,部分磁铁矿解离发育完全,颗粒疏松多孔。但大多数磁铁矿的矿石结构沿袭原矿中的镜铁矿,嵌布特征与嵌布粒度未发生明显变化,磁铁矿的矿石构造仍旧以粗粒条带状,稠密集与稀疏侵染状为主,并呈“不等粒”形式嵌布于脉石矿物之中,部分磁铁矿嵌布粒度较细,影响后续磨矿解离。
Because of its complicated mineral composition and subtle grain size distribution, speckle iron ore is a kind of refractory ore. Therefore, its fine-grained ores are magnetized by a rotary kiln - a magnetic separation test. The results show that the ore roasting has a good effect. Under the conditions of fine grinding to 85% of -0.074 mm and magnetic strength of 144 k A / m, the iron grade of magnetic separation concentrates is only 55.22%. Microscopic analysis shows that , Magnetite is not fully monomer dissociation, affecting the quality of concentrate iron. By analyzing the phase and microstructure of the iron-bearing minerals during calcination, it shows that the ore is magnetized and roasted. Siderite, limonite and most of them have been transformed into magnetite, part of the magnetite dissociates Complete, loose and porous particles. However, most of the magnetite ore structure follow the original ore in the mirror iron ore, embedded features and embedded particle size did not change significantly, the magnetite ore structure is still coarse-grained banding, dense and sparsely invasive Mainly in the form of “not equal to grain ” embedded in gangue minerals, part of the smaller magnetite embedded size, affecting the follow-up grinding dissociation.