摘要
针对重庆綦江沉积型赤褐-菱铁矿,提出离析焙烧-弱磁选工艺实现提铁。矿石与氯化钙、焦炭混匀后置入焙烧炉中进行离析焙烧,铁从弱磁性矿物转变为强磁性矿物后,焙烧矿采用弱磁选回收铁。研究结果表明:焙烧矿中产生了以磁铁矿(Fe3O4)、金属铁(Fe)为主的新矿相及少量的氧化亚铁(Fe O)新矿相,实现了铁与其他杂质的有效分离。在离析焙烧温度为950℃、离析焙烧时间为60 min、氯化钙和焦炭质量分数分别为4%和15%、弱磁选磁场强度H为0.10 T、弱磁选磨矿细度小于0.038 mm的铁精矿质量分数为95%的综合工艺条件下,得到了铁品位为72.02%,硫和磷质量分数分别为0.080%和0.053%,铁回收率为82.09%的铁精矿分选指标,提铁效果显著。
Abstracts:For the sedimentary pattern hematite and limonite-siderite ores in Qijiang of Chongqing, a segregation roasting-low intensity magnetic separation flowsheet was proposed to upgrade iron. Ores, calcium chloride and coke were mixed and put into roasting furnace to undergo segregation roasting. After being transferred from weak to strong magnetic mineral, iron was recovered by low intensity magnetic separation from roasting ores. The results show that in the roasting ores, new ore phases dominated by magnetite (Fe3O4), metallic iron (Fe) and a few ferrous oxide (FeO) are generated, and effective separation of iron minerals as well as other impurities can be achieved. The iron concentrate separation characterized by 72.02% of iron grade, 0.080% of sulfur mass fraction, 0.053% of phosphorus mass fraction, 82.09% of iron recovery can be obtained under segregation roasting temperature of 950℃, segregation roasting time of 60 min, calcium chloride mass fraction of 4%, coke mass fraction of 15%, low intensity magnetic field intensity of 0.10 T and iron ore concentrates mass fraction of 95% of grinding fineness less than 0.038 mm. The effect of upgrading iron is obvious.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第10期3573-3579,共7页
Journal of Central South University:Science and Technology
基金
中国地质大调查项目(12120113087600)
国土资源部钒钛磁铁矿综合利用重点实验室资助项目(KLVMCU-2014-01)~~
关键词
菱铁矿
赤褐铁矿
离析焙烧
弱磁选
siderite
hematite-limonite
segregation roasting
low intensity magnetic separation
