摘要
以TFe品位为30.71%的河南某焙烧氰化尾渣为原料,采用湿式强磁预选-磁化焙烧-磁选联合工艺制备铁精粉.结果表明,当强磁预选的磁场强度为1511.54 k A/m时,得到TFe品位44.96%、回收率78.27%的粗精矿;以该粗精矿为磁化焙烧原料,配10wt%焦粉,于750℃下磁化焙烧45 min,焙烧样经二段磨矿、二段弱磁选,当二段磨矿细度小于0.028 mm占63.9%时,可得TFe品位61.71%、回收率68.66%的铁精粉;产率为16.79%的弱磁选尾矿不含氰化物,转化为一般工业固体废物.焙烧温度低于700℃时,部分赤铁矿未还原;焙烧温度超过800℃时,生成的磁铁矿转化成镁铁矿、铁橄榄石和方铁矿,磁铁矿含量降低,导致铁损失;焙烧温度为750℃时,磁铁矿含量最高.
The combined process, high intensity magnetic preconcentration-magnetization roasting-magnetic separation, was used to prepare iron concentrate from roasted cyanide tailings with TFe grade of 30.71% in Henan province. The results showed that rough iron concentrate with TFe grade of 44.96% and recovery rate of 78.27% was obtained with high intensity magnetic separation at the magnetic field intensity of 1 511.54 kA/m. The rough iron concentrate mixed with 10 wt% coke powder was roasted at 750 ℃ for 45 min. The roasted product was further treated with two-stage grinding and two-stage magnetic separation. The iron concentrate with TFe grade of 61.71% and recovery rate of 68.66% was obtained at the grinding fineness of less than 0.028 mm of 63.9%. Magnetic separation tailings, with a yield of 16.79%, could be classified as common industrial solid wastes due to no residual cyanides. Some hematite was not reduced at the temperature of below 700 ℃,and reduced magnetite could be further transformed to magnesioferrite, fayalite and wustite at the temperature of above 800 ℃, which reduced the content of magnetite and resulted in loss of iron in the magnetic separation. As the roasting temperature was 750 ℃, the highest content of magnetite in roasted samples was achieved.
作者
傅平丰
李振宇
边振忠
Pingfeng FU;Zhenyu LI;Zhenzhong BIAN(School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China;State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2018年第4期774-778,共5页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:51674017)
关键词
氰化尾渣
强磁预选
磁化焙烧
磁化率
cyanide tailings
high intensity magnetic preconcentration
magnetization roasting
magnetic susceptibility
