冀东豆子沟铁矿石工艺矿物学特征

摘要

冀东豆子沟铁矿石铁品位为35. 80%,铁主要以磁铁矿形式存在,其次为赤铁矿、碳酸铁,脉石矿物主要为石英、角闪石和辉石. 为给该矿石开发利用提供依据,对其进行了工艺矿物学分析. 结果表明:矿石结构主要为半自形—他形晶粒状结构,其次为自形晶粒结构、压碎结构、交代残留结构. 矿石构造以条纹状和条带状构造为主,其次为片麻状构造. 磁铁矿主要呈半自形—他形粒状赋存于石英等脉石矿物中,少数呈八面体型或立方体型赋存于石英或角闪石等脉石矿物中. 矿石中磁铁矿嵌布粒度微细,64. 01%的磁铁矿分布在0. 02~0. 16 mm粒级,12. 59%分布在-0. 02 mm粒级,这部分磁铁矿需细磨才能实现单体解离,但细磨容易造成泥化影响选矿指标,故建议采用阶段磨矿阶段选别工艺.%The iron grade of iron ore from Douzigou,Eastern Hebei,is 35. 80%. Iron mainly exists in form of magnetite, followed by hematite and iron carbonate. Gangue minerals are mainly quartz, hornblende and pyroxene. Process mineralogy characteristics of the ore were carried out,to provide technological basis for the development of the ore. The results showed that main mineral structure is hypidiomorphic-allotriomorphic structure,followed by euhedral-granular structure,crush structure and metasomatic relict structure. While the ore textures is mainly streaky and banded texture,followed by gneissic texture. Magnetite mainly disseminated among gangue minerals,like quartz,in form of hypidiomorphic-allotriomorphic structure,few octahedral or cube was hosted in gangue minerals. The granule of the magnetite in ore is so tiny that 64. 01% is distributed in 0. 02~0. 16 mm,12. 59% in-0. 02 mm. Thus the magnetite with smaller particle size needs fineness grinding to be liberated. It is necessa-ry to adopt the process of stage-grinding and stage separation to prevente argillization on beneficiation indexes caused by pul-verizeng impact.