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过程工程学报 ›› 2018, Vol. 18 ›› Issue (4): 774-778.DOI: 10.12034/j.issn.1009-606X.217357

• 过程与工艺 • 上一篇    下一篇

基于强磁预选的某氰化尾渣磁化焙烧-磁选工艺

傅平丰1,2*， 李振宇1， 边振忠1   

  1. 1. 北京科技大学土木与资源工程学院，北京 100083
    2. 金属矿山高效开采与安全教育部重点实验室，北京 100083
  • 收稿日期:2017-10-16 修回日期:2017-11-30 出版日期:2018-08-22 发布日期:2018-08-15
  • 通讯作者: 傅平丰 pffu@ces.ustb.edu.cn
  • 基金资助:
    国家自然科学基金资助项目

Magnetization roasting?magnetic separation of cyanide tailings based on high intensity magnetic preconcentration

Pingfeng FU1,2?, Zhenyu LI1, Zhenzhong BIAN1   

  1. 1. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
    2. State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China
  • Received:2017-10-16 Revised:2017-11-30 Online:2018-08-22 Published:2018-08-15
  • Contact: Ping-Feng FU pffu@ces.ustb.edu.cn
  • Supported by:
    National Natural Science Foundation of China

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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 kA/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.

关键词: 氰化尾渣, 强磁预选, 磁化焙烧, 磁化率, 危险固体废物

Abstract: 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 1511.54 kA/m. The rough iron concentrate mixed with 10wt% 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.

Key words: cyanide tailings, high intensity magnetic preconcentration, magnetization roasting, magnetic susceptibility, hazardous solid wastes