A symplectite of pyrite and magnetite in the massive sulphide ore of the Mashan mine, Anhui Provlnce, ls interpreted to have been formed by their replacing earlier pyrrhotite.The compositions of Pyrrhotite, pyrite and...A symplectite of pyrite and magnetite in the massive sulphide ore of the Mashan mine, Anhui Provlnce, ls interpreted to have been formed by their replacing earlier pyrrhotite.The compositions of Pyrrhotite, pyrite and magnetite related to this texture are given by electron microprobe analysis. Such a texture is likely to be formed when the ore-forming system reaches the three-phase point of pyrrhotite, pyrite and magnetite from the pyrrhotite stability field. The very small probability for the system to reach this Point could be llsed to account for the rare occurrence of such symplectite in natural ores.展开更多
河南某铁铜矿石结构构造及矿物组成均较简单,有用矿物磁铁矿和黄铜矿的粒度均较粗。为了确定2粗3精2扫闭路优先浮铜尾矿弱磁选选铁的合理工艺流程,开展了直接1粗1精弱磁选、弱磁粗选精矿磨矿后弱磁精选、先磨矿后1粗1精弱磁选3种工艺选...河南某铁铜矿石结构构造及矿物组成均较简单,有用矿物磁铁矿和黄铜矿的粒度均较粗。为了确定2粗3精2扫闭路优先浮铜尾矿弱磁选选铁的合理工艺流程,开展了直接1粗1精弱磁选、弱磁粗选精矿磨矿后弱磁精选、先磨矿后1粗1精弱磁选3种工艺选铁试验。结果表明,弱磁粗选精矿磨矿后弱磁精选工艺效果最佳,在再磨细度为-0.074 mm 90%、弱磁粗选和弱磁精选磁场强度分别为95.54 kA/m和67.58 kA/m情况下,可获得铁品位65.50%、回收率53.53%的铁精矿。展开更多
对某地低品位硫酸渣经还原焙烧-磁选所得磁铁精矿进行了球团试验研究,结果表明,该磁铁精矿添加1.5%的湖泗膨润土,在造球时间10 m in、生球水分16.8%的条件下,得到生球落下强度5.3次/0.5 m、抗压强度31.55 N/个、爆裂温度435℃的良好指标...对某地低品位硫酸渣经还原焙烧-磁选所得磁铁精矿进行了球团试验研究,结果表明,该磁铁精矿添加1.5%的湖泗膨润土,在造球时间10 m in、生球水分16.8%的条件下,得到生球落下强度5.3次/0.5 m、抗压强度31.55 N/个、爆裂温度435℃的良好指标;球团在预热温度900℃、预热时间10 m in、焙烧温度1 200℃、焙烧时间15 m in的条件下固结,成品球团抗压强度可到达2 871N/个,还原度为83.38%,还原膨胀指数为17.86%,低温还原粉化指数RD I-3.156.12%。研究结果证明,使用该磁铁矿完全能生产出可供高炉使用的优质氧化球团,既扩大了钢铁企业原料来源,又综合利用了硫酸渣中的铁资源,具有重大的环保效益。展开更多
文摘A symplectite of pyrite and magnetite in the massive sulphide ore of the Mashan mine, Anhui Provlnce, ls interpreted to have been formed by their replacing earlier pyrrhotite.The compositions of Pyrrhotite, pyrite and magnetite related to this texture are given by electron microprobe analysis. Such a texture is likely to be formed when the ore-forming system reaches the three-phase point of pyrrhotite, pyrite and magnetite from the pyrrhotite stability field. The very small probability for the system to reach this Point could be llsed to account for the rare occurrence of such symplectite in natural ores.
文摘河南某铁铜矿石结构构造及矿物组成均较简单,有用矿物磁铁矿和黄铜矿的粒度均较粗。为了确定2粗3精2扫闭路优先浮铜尾矿弱磁选选铁的合理工艺流程,开展了直接1粗1精弱磁选、弱磁粗选精矿磨矿后弱磁精选、先磨矿后1粗1精弱磁选3种工艺选铁试验。结果表明,弱磁粗选精矿磨矿后弱磁精选工艺效果最佳,在再磨细度为-0.074 mm 90%、弱磁粗选和弱磁精选磁场强度分别为95.54 kA/m和67.58 kA/m情况下,可获得铁品位65.50%、回收率53.53%的铁精矿。
文摘对某地低品位硫酸渣经还原焙烧-磁选所得磁铁精矿进行了球团试验研究,结果表明,该磁铁精矿添加1.5%的湖泗膨润土,在造球时间10 m in、生球水分16.8%的条件下,得到生球落下强度5.3次/0.5 m、抗压强度31.55 N/个、爆裂温度435℃的良好指标;球团在预热温度900℃、预热时间10 m in、焙烧温度1 200℃、焙烧时间15 m in的条件下固结,成品球团抗压强度可到达2 871N/个,还原度为83.38%,还原膨胀指数为17.86%,低温还原粉化指数RD I-3.156.12%。研究结果证明,使用该磁铁矿完全能生产出可供高炉使用的优质氧化球团,既扩大了钢铁企业原料来源,又综合利用了硫酸渣中的铁资源,具有重大的环保效益。