弓长岭磁铁矿石磁脉冲预处理试验研究
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摘要
研究了磁脉冲预处理技术对弓长岭磁铁矿石磨矿效率和分选指标的影响规律,借助扫描电镜和显微镜进行了预处理前后矿样的微观结构及磨矿产品单体解离度分析。结果表明,在磁脉冲磁场强度为39.81 kA/m条件下处理5 s后,磨矿产物中小于0.043 mm粒级含量与未处理样相比,提高了4.58个百分点;在磨矿时间为9 min,磁选磁场强度为79.62 kA/m时,预处理后试样磁选精矿TFe品位未处理样磁选精矿提高了1.16个百分点,铁回收率较未处理样提高了1.21个百分点;在磁脉冲设备产生的磁应力作用下,矿石内部不同矿物界面结合强度降低,生成扩展裂纹和裂缝,有利于磨矿过程提高铁矿物单体解离度,最终提高矿石的磨矿效率和分选指标。
The influence of magnetic pulse pretreatment technology on grinding efficiency and separation index of Gongchangling magnetite was studied. Microstructure of samples and dissociation degree of grinding products before and after pretreatment were analyzed by means of scanning electron microscopy and microscopy. The results show that under the condi?tions of 39.81 kA/m magnetic field intensity and 5 s pretreatment time, the content of-0.043 mm in the grinding products after pretreatment increases by 4.58 percentage points on average; under grinding time of 9 min, and magnetic separation field in?tensity of 79.62 kA/m, the TFe grade of the pretreated magnetic concentrate increased by 1.16 percentage points, compared with untreated sample, and the iron recovery increases by 1.21 percentage points on average; under the action of magnetic stress produced by magnetic pulse equipment, the bonding strength of different mineral interfaces in the ore decreases, result?ing in cracks, which is beneficial for liberation degree increase in grinding process, and ultimately improving the grinding effi?ciency and separation index of magnetite.
The influence of magnetic pulse pretreatment technology on grinding efficiency and separation index of Gongchangling magnetite was studied. Microstructure of samples and dissociation degree of grinding products before and after pretreatment were analyzed by means of scanning electron microscopy and microscopy. The results show that under the condi?tions of 39.81 kA/m magnetic field intensity and 5 s pretreatment time, the content of-0.043 mm in the grinding products after pretreatment increases by 4.58 percentage points on average; under grinding time of 9 min, and magnetic separation field in?tensity of 79.62 kA/m, the TFe grade of the pretreated magnetic concentrate increased by 1.16 percentage points, compared with untreated sample, and the iron recovery increases by 1.21 percentage points on average; under the action of magnetic stress produced by magnetic pulse equipment, the bonding strength of different mineral interfaces in the ore decreases, result?ing in cracks, which is beneficial for liberation degree increase in grinding process, and ultimately improving the grinding effi?ciency and separation index of magnetite.
引文
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[2]Valentine A.Theory and applications of high-power nanosecond pulses to processing of mineral complexes[J].Mineral Processing and Extractive Metallurgy Review,2011,32:105-136.
[3]马淮湘.超贫磁铁矿选矿技术新进展与思考[J].现代矿业,2010(4):33-34.Ma Huaixiang.Progress of mineral processing technology of ultralow-grade magnetite[J].Modern Mining,2010(4):33-34.
[4]徐承焱,孙体昌,杨慧芬,等.某难选铁矿石直接还原焙烧磁选研究[J].矿冶工程,2010,30(3):36-39.Xu Chengyan,Sun Tichang,Yang Huifen,et al.Direct reduction roasting-magnetic separation technique of a refractory iron ore[J].Mining and Metallurgical Engineering,2010,30(3):36-39.
[5]克雷诺娃ГС,崔洪山,林森.采用磁脉冲预处理强化从矿石和精矿中回收金的过程[J].国外金属矿选矿,2007(12):24-25.KeleinuowaГС,Cui Hongshan,Lin Sen.Enhancement of gold recovery from ores and concentrates by magnetic pulse pretreatment[J].Metallic Ore Dressing Abroad,2007(12):24-25.
[6]余建文,高鹏,韩跃新,等.难浸金矿预处理方法的新进展[J].矿冶,2013,22(2):59-62.Yu Jianwen,Gao Peng,Han Yuexin,et al.New advances of refractory gold ore pretreatment method[J].Mining and Metallurgy,2013,22(2):59-62.
[7]高鹏,李国峰,周惠文,等.铁矿石磁脉冲预处理技术研究[J].中国矿业,2015,24(11):135-138.Gao Peng,Li Guofeng,Zhou Huiwen,et al.Effect of magnetic pulse preprocessing on iron ore[J].China Mining Magazine,2015,24(11):135-138.
[8]Louis J.Study of native gold from the Luopensulo deposit(Kostomuksha area,Karelia,Russia)using a combination of electric pulse disaggregation(EPD)and hydroseparation(HS)[J].Minerals Engineering,2008,21(6):463-470.