高磷鲕状赤褐铁矿离析焙烧提铁降磷研究  

Upgrading iron and removing phosphorus of high-phosphorus oolitic hematite-limonite ores by segregation roasting

作　　者：肖军辉[1,2] 张裕书[2,3] 冯启明[1] 陈超[2,3] 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]国土资源部钒钛磁铁矿综合利用重点实验室,四川成都610041 [3]中国地质科学院矿产综合利用研究所,四川成都610041

出　　处：《中国矿业大学学报》2015年第4期731-738,共8页Journal of China University of Mining & Technology

基　　金：国土资源部钒钛磁铁矿综合利用重点实验室开放基金项目(KLVMCU-2014-01);中国地质调查局项目(12120113087600)

摘　　要：针对重庆桃花高磷鲕状赤褐铁矿中,有害元素P的质量分数较高为1.17%,有85.90%的P分布于褐铁矿中,其余以胶磷矿形式产出,提出了离析焙烧-弱磁选工艺实现提铁降磷.矿石与氯化剂、还原剂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.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(FeO)新矿相,实现了铁矿物与磷矿物的有效分离;在离析焙烧温度950℃、焦炭用量20%、废盐用量45%、离析焙烧时间60min、弱磁选磁场强度H=0.12T、弱磁选磨矿细度小于0.038mm占95%的综合工艺条件下,得到了Fe的质量分数为71.65%,P的质量分数为0.17%,Fe回收率为87.92%的铁精矿分选指标,提铁降磷效果显著.Higher proportion of harmful phosphorus of 1.17% was found in Chongqing Taohua oolitic hematite-limonite.85.90% of the phosphorus distributed in hematite,and the rest were in the form of collophanite.A segregation roasting and low intensity magnetic separation technology was proposed to upgrade iron and remove phosphorus.Ores,chlorinating agent and reductant were mixed and put into roasting furnace to conduct segregation roasting.After being transferred from weak to strong magnetic mineral,the iron was recovered by low intensity magnetic separation from roasting ores.Study results indicated that during roasting,new ore phases dominated by magnetite（Fe3O4）,metallic iron（Fe）and a few ferrous oxide（Fe）were generated,and effective separation of iron minerals as well as phosphorus minerals was achieved.The iron concentrate separation characterized by iron content of 71.65%,phosphorus content of 0.17%,iron recovery of 87.92% was obtained under roasting temperature of 950℃,dosage of coke of 20%,dosage of rejected salt of 45%,roasting time of 60 min,low-inten-sity magnetic field intensity of 0.12 Tand 95% of grinding fineness less than 0.038 mm.The effect of upgrading iron and removing phosphorus was obvious.

关 键 词：高磷鲕状赤褐铁矿 提铁降磷 离析焙烧 弱磁选 

分 类 号：TD951[矿业工程—选矿] TD925.6