双环形移动磁系干式细粉料磁选机的研制

为解决细粉料干式强磁选分选效果差、台时产量低等一系列问题，新研制了高效干式细粉料强磁选设备--双环形移动磁系干式细粉料磁选机。该设备集磁性料预富集与精选、非磁性料扫选等功能于一体，但各功能区又相对独立，整个分选过程无需细粉料充分分散，解决了因细粉料团聚力大而难以干式选别的问题；设备采用长距离双环形移动磁系，大大加长分选区域，是实现高效分选的关键所在；在分选钢渣粉等含有水化活性成分的物料时，该设备既能有效保护水化活性成分不被破坏，又能高效提取其中的磁性矿物，使钢渣粉水泥混合材的品质提高1个等级。对平均粒径为30 μm、比表面积为307 m2/kg、铁品位为14.86%（磁性矿物含量为30.09%）的太钢钢渣粉的分选表明，所得精矿的铁品位和回收率分别可达32.21%（磁性矿物含量为65.22%）和90.30%，干选尾矿的活性指数提高了15个百分点以上。该设备适合从含有水化活性成分的细粉料中高效干选出磁性矿物。

Development of Double Circular Moving Magnetic System Dry-magnetic Separator for Fine Powder

For the purpose of solving low efficiency and low output per machine-hour of dry magnetic separation for fine powder，a new type of high efficiency dry magnetic separator for fine powder was developed which is called double circular moving magnetic system dry-magnetic separator for fine powder.The device consists of enrichment of particles with magnetism and concentration，and scavenging of nonmagnetic particles，however each working area is relatively independent.The problem of low efficiency of separation owing to great agglomerating force between fine particles has been solved，since fine particles with well dispersed state are not prerequisite in whole separation process.The device possesses long double circular moving magnetic system structure and has the advantage of a long separation area，which is the key to achieve efficient separation.In the separation of the materials containing hydration active ingredient such as steel slag powder by the device，the ingredients is not destroyed by hydration reaction，and the magnetic minerals are efficiently extracted，as a result of raising the quality of the steel slag powder as addition of cement by a level.The separation results on steel slag powder from Taiyuan Iron & Steel Co.，Ltd.with the average particle size 30 μm，the specific surface area 307 m2/kg and the iron grade 14.86%(magnetic minerals content of 30.09%) show that iron grade and recovery of concentrate reaches 32.21%( magnetic minerals content of 65.22%) and 90.30% respectively，and the activity index of tailings is improved over 15 percentage points.The device is good at separation of the fine materials containing hydration active ingredient.