Forums » News and Announcements
Principle of the degassing unit
-
The degassing unit is a new type of porous ceramic material with a porosity of 80%-90%, a three-dimensional network skeleton structure, and through-holes.
Filtration and purification mechanism of degasser
1. Through inertial collision interception, diffusion interception, friction, sedimentation, and other mechanical filtration. Filtration efficiency is proportional to the pore size of the foam ceramic. The smaller the mesh, the stronger the retention of small particles.
2. With the deposition of particles in the melt and the deposition of the curved branch walls of the grid, the trapping ability of mixed-phase particles increases with the deposition layer or cake layer effect.
3. The rough surface formed by the absence of gaps on the surface of the frame increases the interface between the flow of aluminum melt and the density of ceramic solid particles, making the flow direction of the particles in the flow of aluminum melt more disordered, which is conducive to the capture and removal of solid particles. deposition.
4. Due to the existence of microcracks and pinholes on the frame surface, fluorides with a strong affinity for particles such as Al2O3 are pre-deposited, which promotes the complete filter cake effect and strong chemisorption, and enhances the capture of residual heteropoly particles. ability.
In addition, from the point of view of the temperature field effect of the melting process and the degassing unit of the metal melt, the bottom difference of the alloy solute concentration must be formed, and the metal melt is redistributed-integrated-redistributed-integration, which is also a good alloying process. . Some high melting point metal phases and compounds recombine and grow, and small impurities gather and grow, which is beneficial to filtration and trapping. This can also be explained by the concentration changes of H, Al2O3, Fe phase, and Ti phase before and after filtration. Especially two-stage filtration or pore gradient thick plate filtration is more obvious.
According to the Egyptian aluminum industry, casting is the process of producing aluminum profiles.
According to the raw materials and product structure, the reasonable selection of the casting process of aluminum profiles is the key to ensuring product quality, reducing energy consumption, and improving production efficiency. So what is the casting process of aluminum profiles? Let's take a look.
1. Aluminum ingots: Before production, according to the different alloys and different outputs of aluminum ingots, prepare enough aluminum ingots, magnesium ingots, silicon ingots, copper ingots, and auxiliary materials.
2. Loading the furnace: Load the aluminum ingots, composite ingots, and rod heads into the furnace with a forklift.
3. Melting: After adding enough material to the furnace, heat it to 700-730℃ with natural gas, and the aluminum ingot will be melted into a liquid state.
4. Refining: adding various paving auxiliaries to remove impurities in aluminum water.
5. Drain the molten aluminum: Remove the plug of the drain at the bottom of the furnace and release the molten aluminum.
6.? ? Casting: 25~35 seconds after the degassing unit is filled with the manifold, the cooling water is turned on. The pouring speed is 70~80% of the normal speed, and the speed decreases by 40~50mm and then rises to the normal speed.
7. Homogenization: The aluminum rod is subjected to secondary homogenization treatment.
8. Saw blade: Remove the irregular parts at the front and rear ends of the aluminum bar.
9. Storage: Aluminum rods are bundled into storage and placed.
Generally speaking, the degassing unit transforms the liquid aluminum into aluminum ingots, aluminum bars or other finished or semi-finished products by batching, stirring, standing, refining, and slagging. Casting production is an extremely important process in the production of aluminum and aluminum alloy products. Ingot quality directly affects the yield, quality, and performance of subsequent profile products.