摘要
复合铁矿往往含有强磁性和弱磁性矿物,采用预选抛废工艺,通过常规筒式磁选机往往不能达到比较理想的选别指标,而且存在工艺及设备运行复杂等难题。为了提高复合铁矿石的高效预选作业效率,尽量提高矿石的入磨品位,简化磨选工艺流程,减少磨选作业处理量,降低设备的生产成本,采用一种新型的磁选技术,使用单台设备便可实现不同种类矿石的梯级分选作业,解决配置复杂以及湿式磨前预选工艺,是外磁式磁选机降本增效的一种有效途径。本文在研究外磁式磁选机的分选原理及结构特点时,分析了梅山铁矿实验室指标,对筒体转速、漂洗水量以及设备倾角进行了调整,并经过现场工业试验验证,获得了精矿TFe品位53.24%、尾矿TFe品位小于22%,Fe回收率64.78%的最佳试验分选指标。对龙桥铁矿进行了磁场强度条件试验及漂洗水量条件试验,龙桥铁矿最终获得了精矿TFe品位44.36%,Fe回收率为94.19%的最佳试验指标。
The composite iron ore often contains strong magnetic and weak magnetic minerals,and the pre-selection waste disposal process is often used.Conventional cylindrical magnetic separators often fail to achieve the ideal selection index,and there are problems such as complicated process and equipment operation.In order to improve the efficient pre-selection of composite iron ore,try to increase the grade of the ore into the mill,simplify the grinding process,reduce the processing capacity of the grinding operation,and reduce the production cost of the equipment,a new type of magnetic separation technology is used,and a single equipment can be used to realize the cascade separation operation of different types of ores.It solves the complicated configuration and wet pre-grinding pre-selection process,which is an effective way of the external magnetic type magnetic separator to reduce cost and increase efficiency.In the study of the separation principle and structure characteristics of the external magnetic separator,the laboratory indexes of Meishan Iron Mine were analyzed,the drum speed,the amount of rinsing water and the equipment inclination were adjusted,and the industrial condition tests on site were carried out to obtain iron concentrate with TFe grade of 53.24%and the tailings with TFe grade of less than 22%.The recovery of Fe reaches 64.78%.The magnetic field intensity condition test and the rinsing water quantity condition test on Longqiao Iron Mine were carried out.The Longqiao Iron Mine finally obtained iron concentrate with TFe grade of 44.36%and Fe recovery of 94.19%in which the indexes are the best.
作者
李尧
成磊
史佩伟
尚红亮
王芝伟
LI Yao;CHENG Lei;SHI Peiwei;SHANG Hongliang;WANG Zhiwei(BGRIMM Technology Group,Beijing 100160,China;BGRIMM Machinery&Automation Technology Co.,Ltd.,Beijing 100160,China)
出处
《有色金属(选矿部分)》
CAS
北大核心
2021年第3期121-125,142,共6页
Nonferrous Metals(Mineral Processing Section)
关键词
外磁式磁选机
预选抛废
磁场强度
external magnet magnetic separator
pre-selection
magnetic field intensity