Generally speaking, iron is undesirable in raw materials for non-metallic powders. From the standpoint of the application of special ceramics such as alumina and zirconia, when the content of Fe ions is 500PPM, they will seem yellow, and if the content is higher, they will appear gray or even black. Controlling the iron concentration is crucial if special ceramics are to maintain their original color. Furthermore, the presence of iron affects the dielectric characteristics of ceramics, and it also has a significant impact on the breakdown strength, insulation resistance, and voltage resistance of electronic ceramics. Hence, iron impurities must be eliminated.
Domestic technology is well developed for the iron removal of alumina powder, and the performance of iron removal equipment is relatively easy to satisfy the requirements. Iron removal from zirconia materials is still a challenge, though. Because zirconium oxychloride is an intermediate product of zirconia, chloride ions frequently react with the medium of iron removal equipment, reducing the effectiveness of the iron removal process.
Special Ceramic Fine Iron Removal Equipment
In general, iron removal is necessary during the crushing of non-metallic ore as well, but because the requirement for the iron concentration is not strict and the majority of the materials are composed of large particles, the iron removal effect requires a percentage level. Fine iron removal equipment processes micron-sized or even nano-sized particles, and the iron removal effect must be at the PPM level. Furthermore, the finer the material, the weaker the magnetism and the higher the performance requirements for iron removal equipment. As a result, the structural design and working process of special ceramic fine iron removal equipment differ from those for large non-metallic mines.
Comparison of Dry and Wet Iron Removal Methods
For fine iron removal, wet iron removal method is more simpler to operate than the dry one. When using the dry iron removal method, the ultra-fine powder in the dry state is prone to agglomeration, the fluidity is poor, and the feeding is challenging, so that it is usually completely with the help of vibration motor. Additionally, its iron removal effect is inferior to that of wet iron removal method.
Fully Automatic Electromagnetic Iron Remover
The automatic iron removal equipment is primarily intended for the automatic cleaning of the iron removal medium during the iron removal process. After using the traditional iron remover for a while, the iron removal medium must be manually cleaned. These spherical, mesh, or filamentous iron removal media must be cleaned frequently and laboriously, which affects production efficiency. The fully automatic electromagnetic iron remover features a cleaning function that is automatic and adjustable in terms of time. The iron removal medium is automatically cleaned using high-pressure water and high-pressure gas under the control of PLC, dramatically improving the performance of equipment and work efficiency.
Physical Iron Removal
Pickling, as a chemical iron removal method, has been widely employed by firms in the powder industry's iron removal process. The discharge of pickling waste is, however, being more closely supervised as the environmental protection requirements rise, and the method of pickling purification previously employed in processing workshops will be strictly forbidden. Seeking alternative, high-standard physical iron removal equipment will be a significant development direction for iron removal process, bringing chances for electromagnetic iron removal equipment.