Study on capture radius and efficiency of fine weakly magnetic minerals in high gradient magnetic field
Study on capture radius and efficiency of fine weakly magnetic minerals in high gradient magnetic field
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DOI：
10.1016/j.mineng.2015.02.001
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发表时间：
2015-04
影响因子：
4.8
通讯作者：
Xiayu Zheng;Yu-hua Wang;Dongfang Lu
中科院分区：
文献类型：
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作者：
Xiayu Zheng;Yu-hua Wang;Dongfang Lu
利用HGMS回收超细弱磁性矿物是工业实践中的一个难题。HGMS参数的优化决定了回收率的高低。采用数值计算方法研究了直径1 ~ 30 μm的弱磁颗粒在高梯度磁场中的捕获极限。基体尺寸、料浆速度和磁感应强度对捕获半径有较大影响。捕集半径随粒径的减小、基质直径的增大和料浆速度的增大而迅速减小。在广义条件下，捕获半径在很大程度上取决于浆液速度v0与所谓磁速度vm的比值。捕获效率随着矩阵排列值ofd/a（矩阵间距与矩阵半径的一半之比）的增加而降低。得到了捕获效率与v0 /Vmas之间的关系。这种关系可以为选择最佳尺寸和排列矩阵或配置HGMS系统以获得高捕获效率提供指导。并演示了如何将HGMS系统从低捕获效率的工作点调节到高捕获效率的工作点。
The recovery of ultrafine weakly magnetic minerals using HGMS is proved a tough issue in industrial practice. Optimization of HGMS parameters determines the recovery result. The capture limits of weakly magnetic particles of diameter range 1–30 μm in high gradient magnetic field are studied using a numerical computation method. The matrix size and slurry velocity as well as the magnetic induction show great influence on the capture radius. The capture radius decreases rapidly with the decrease of particle size, the increase of matrices diameter and slurry velocity. For generalized condition, the capture radius is largely dependent on the ratio of slurry velocityV0to the so called magnetic velocityVm. The capture efficiency decreases with the increase of the matrices arrangement value ofd/a(the ratio of half the spacing between matrices to the matrix radius). The relationship between capture efficiency andV0/Vmas well asd/ais obtained. This relationship can provide a guidance of choosing matrices of the perfect size and arrangements or configuring the HGMS system to work with high capture efficiency. It is also demonstrated how to regulate the HGMS system from a working point of low capture efficiency to a working point of high capture efficiency.