Ferrite mixing granulating machine is a key process in the preparation of magnetic materials,and the AKW inclined mixer,as a high-efficiency equipment,has significant advantages in this process.The following is a systematic analysis from the aspects of equipment characteristics,process adaptability and operation points:
Material characteristics
Ferrite powder is usually micron-sized particles with poor fluidity and easy agglomeration,requiring highly uniform mixing.
Granulation needs to form particles with uniform particle size and high density to improve the yield of subsequent pressing or sintering.
Process requirements
Mixing stage:Avoid stratification,and combine shear force with convection mixing.
Granulation stage:Add adhesive(such as PVA solution)to form stable particles through wet granulation.
Equipment structure and working principle
Tilt design:The mixing container can be tilted(usually 15°~60°),using the synergistic effect of gravity and centrifugal force to enhance material tumbling.
Three-dimensional motion:Through the composite motion of revolution and rotation,dead-angle mixing is achieved,which is suitable for ferrite materials with high-precision proportioning.
Granulation integration:Some models are equipped with a spray system,which can simultaneously complete mixing and wet granulation to reduce process switching.
Key technical parameters
Speedadjustment:Low-speed mixing(10-50 rpm)avoids powder dust,and high-speed granulation(100-300 rpm)promotes particle forming.
Temperature control system:Optional heating jacket to regulate the volatilization rate of the adhesive and optimize the particle strength.
Sealing:Nitrogen protection interface to prevent ferrite oxidation(especially suitable for Mn-Zn ferrite).
Compared with traditional equipment
Better than V-type mixer:The efficiency of inclined dynamic mixing is increased by more than 30%,especially suitable for nano-level powders.
Compared with fluidized bed granulation:The particle density is higher,which is suitable for subsequent isostatic pressing process.
Binder addition strategy
Use atomizing nozzle to spray in stages to avoid local over-wetting and agglomeration.
It is recommended that the binder account for 5%-8%(adjusted according to the specific surface area ofthe powder).
Process optimization direction
Particle uniformity control:By adjusting the tilt angle and speed matching,the granulation time is shortened to 20-40 minutes.
Energy consumption management:Use variable frequency drive to reduce power consumption under high load,and the comprehensive energy efficiency is improved by 15%-20%compared with traditional equipment.
Common problem solutions
Particle looseness:Increase the speed of the granulation stage or extend the mixing time to enhance mechanical force densification.
Wall sticking problem:Use Teflon coating inner wall or airflow assisted cleaning system.
IV.Application cases and data reference
Ferrite soft magnetic material production case
Equipment model:AKWCR15 inclined mixer granulator
Processing capacity:single batch 500kg ferrite(Fe₂O₃+NiO+ZnO mixed powder)
Result:roundness>0.85,magnetic permeability increased by 12%after sintering.
V.Selection suggestions
Small R&D line:optional EL01,EL05.R02,R04,R05(1-50L capacity),support parameter intelligent recording(such as torque curve monitoring granulation end point).
Large-scale production:R09-RV24(100-2000L)and above models are recommended,with automatic feeding/discharging system to achieve continuous production.
AKW inclined intensive mixer significantly improves the process efficiency and product consistency of ferrite materials through the integration of its dynamic mixing mechanism and granulation function.In actual applications,it is necessary to optimize the parameters such as rotation speed and binder addition method in combination with the powder characteristics,and pay attention to equipment maintenance(such as regular cleaning of blade accumulation)to ensure long-term stability.For the production of high value-added magnetic materials,this equipment is a choice with both economic and technical advantages.