磁铁矿粉来源丰富，价格便宜，化学性质比较稳定。它的密度接近于5000 kg/m3，用其配制的悬浮液的密度可在1200～2000 kg/m3的范围内调节。磁铁矿属于铁磁性矿物，容易用磁选机回收复用。用磨细的磁铁矿粉配制的重介质是一种半稳定的悬浮液。当磁铁矿粉粒度较细(如-0．074mm或-0．05mm)，并有少量煤泥和矸石泥化物(这些都是在生产中不可避免地会产生的)存在时，可以达到比较适宜的稳定性和粘度。在分选容器中只要有少量的扰动就可以保持相对稳定。以上特性使得磁铁矿悬浮液适合于各种煤炭的分选。目前，国内外重介质选煤几乎都采用磁铁矿悬浮液作为分选介质。重介分选机中，原煤进入后就会按密度分为两个产品，分别收集这两种产品，可达到按密度分选的目的。
Magnet kuangfen source is rich, cheap, relatively stable chemical properties. Its density is close to 5000 kg/m3, with its preparation of slurry density can be in the range of 1200 ~ 2000 kg/m3. Magnetite is ferromagnetic minerals, easy to use magnetic separator recovery and reuse. With fine grinding magnet mineral powder preparation of dense medium is a kind of half a stable suspension. When magnet mineral powder particle size is fine, such as 0.074 mm or 0.05 mm), and a small amount of coal and waste rock mud compound (these are inevitably produced in production), can be more suitable for the stability and viscosity of. As long as there is a small amount of disturbance in separation container can keep relatively stable. The above features make magnetite suspension is suitable for all kinds of coal separation. At present, the heavy medium coal preparation using magnetite suspension as almost all separation medium. Dense medium separation machine, the raw coal into will be according to the density is divided into two products, after collecting these two products, can achieve the goal of sorting according to the density.
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