齐大山西石砬子赤褐铁矿工艺矿物学研究

为了提高西石砬子赤褐铁矿选别效果，通过化学多元素分析、XRD分析、铁物相分析等手段，对有代表性的矿石进行了系统的工艺矿物学研究。结果表明：①齐大山西石砬子赤褐铁矿TFe品位27.88%，主要 脉石成分SiO2含量为55.65%，有害成分P、S含量分别为0.006%、0.005%。②矿石中金属矿物主要为赤铁矿和磁铁矿，褐铁矿少量、黄铁矿微量；非金属矿物主要为石英，此外，还有少量绿泥石和白云母。矿石中的铁 主要为赤、褐铁矿，其次为磁性铁。③矿石结构为自形—半自形晶结构、假象结构、残余结构及交代结构；矿石构造主要为条纹状构造和浸染状构造。④矿石中原生赤铁矿与磁铁矿相互嵌布，磁铁矿氧化蚀变生成假 象赤铁矿，次生赤铁矿呈斑点状、细脉状、网脉状和蛛丝状分布在磁铁矿中。赤铁矿与磁铁矿呈不混溶连晶颗粒，二者彼此难以解离，可一起回收。矿石中少量褐铁矿呈细脉状填充在赤铁矿粒间及内部，与赤铁矿的 嵌布关系复杂。⑤石英主要以自形粒状集合体产出，嵌布粒度细，粒间嵌布有少量细粒绿泥石、白云母。⑥磁铁矿和赤铁矿以中粒嵌布为主，细粒级含量大，-0.038 mm粒级中分布率高达20.22%，较难完全单体解离， 易流失于尾矿中，回收难度大。

Processing Mineralogical Study of Qidashan Xishilazi Hematite and Limonite

In order to improve the separation effect of hematite and limonite in Xishilazi， systematic process mineralogy research was carried out on representative ores through chemical multi-element analysis， XRD analysis， iron phase analysis and so on. The results showed that:①The TFe grade of hematite and limonite in Xishilazi of Qidashan is 27.88%， and the contents of the main gangue component SiO2 is 55.65%. The contents of harmful elements P and S in the ore are 0.006% and 0.005%， respectively. ②The main metallic minerals in the ore are hematite and magnetite， followed by a small amount of limonite and a trace of pyrite. Non-metallic minerals are mainly quartz and a small amount of chlorite and muscovite. The iron in the ores mainly occurs in hematite and limonite， followed by magnetic iron. ③The ore structure consists of automorphic to semi-automorphic crystal structure， pseudomorphic structure， residual structure and metasomatic structure. The ore is mainly in the form of striped structure and disseminated structure. ④Primary hematite and magnetite are mutually embedded in the ore. Magnetite is oxidized and altered to generate pseudo hematite， and secondary hematite is speckled， veined， reticulated and spider-like distribution in the magnetite. Hematite and magnetite are immiscible intergranular particles， and the two are difficult to dissociate from each other and could be recovered together. ⑤Quartz is mainly produced in automorphic granular aggregates， with fine dissemination particle size， and a small amount of fine chlorite and muscoite are embedded between particles. ⑥Magnetite and hematite are mainly distributed in medium grains， and the contents of fine grains is large. The distribution rate bellow 0.038 mm grain size is as high as 20.22%. It is difficult to achieve completely monomer separation and easy to be lost in tailings， causing difficult in recovery.