High Gradient Magnetic Separation of Pneumatic Conveyed Powder Products

The interfusion of ferromagnetic impurities such as metallic wear debris has been one of the problems in the manufacturing process of powder products. To remove such impurities, we developed high gradient magnetic separation system (HGMS) under dry process which has many advantages against conventional technology under wet process. The major problem of dry HGMS system was the blockage of magnetic filter caused by particle aggregation or deposition. In our previous study, we succeeded to reduce the blockage under dry condition by using prismatic-shaped filter whose slope was steeper than repose angle of the powder samples. In order to actualize the magnetic separation without blockage, we introduced the mechanism of pneumatic conveyance system of powders. The powder samples are dispersed adequately, and high separation efficiency can be obtained with developed system.