摘要
X-光分析表明，铁精矿粉和用其还原的铁粉中的盐酸不溶物（AIC）为氧化物，其中约60％是六方和四方晶系的石英，其余40％为均含Si和Al的硅线石、氧化铝-氧化硅复合氧化物和一种未命名的沸石，它们无磁性，应易于从磁铁矿中选出。扫描电镜显示，其粒度为3～7μm，它们可能成为烧结体的裂纹源，从而损伤其力学性能。对精矿粉和矿石还原铁粉中的AIC进行了跟踪调查和统计分析，磁铁矿型精矿粉中AIC的平均值和标准差为（0．130±0．010）％，还原后AIC的预测值为（0．179±0．014）％，实测值为（0．192±0．014）％，两者仅差0．013％，这表明在还原和破碎过程中由于环境所造成的污染甚少。若严格控制选矿过程，将精矿粉AIC控制在0．07％左右，并防止还原时可能造成的污染，有可能得到AIC为0．12％-0．15％的优质矿石还原铁粉。
X-ray analysis results of iron ores and reduced iron powders revealed that around 60 % hydrochloric acid-insoluble substances were hexagonal and tetragonal quartz, another 40% substances were Si and AI containing, sillimanite,alumina-silicate, an unnamed zeolite, which are easily separated from magnetite powder. SEM images displayed that the particle size of acid-insoluble sustanees in the range of 3 - 7 μm, which may be the initial source of the cracks in the sintered body. Statistics analysis showed that the acid-insoluble content （AIC）of high-grade magnetite powder was （0.130± 0.010）%. The predicted AIC of reduced iron powder from ore powders should be（0. 179 ± 0.014） %. However,the measured value was（0. 192 ± 0.014） %. The difference of 0.013 % implies little pollution coming from the reduction and milling processes. A highgrade reduced iron powder eontainning 0.12- 0.15% AIC may be prepared if the AIC of ore powder is controlled to be less than 0.07 %.
出处
《粉末冶金工业》
CAS
北大核心
2006年第5期5-10,共6页
Powder Metallurgy Industry
关键词
铁粉
盐酸不溶物
铁精矿
Iron Powder
AIC
iron concentrates
