Molten Aluminium Degassing unit of Adtech
Molten aluminium (Al) is an extremely reactive substance. The molten metal is so reactive that it will readily decompose water in the... moreMolten Aluminium Degassing unit of Adtech
Molten aluminium (Al) is an extremely reactive substance. The molten metal is so reactive that it will readily decompose water in the atmosphere, or moisture on wet tools, releasing hydrogen into the melt. Even small volumes of water condensing on a crucible furnace or transfer ladle can affect the quality of final castings. Excess hydrogen can affect the distribution of porosity, and the total amount of shrinkage, ultimately increasing scrappage. Eliminating gas absorption from molten aluminium is unfeasible. So, metallurgists tend to focus on preventing hydrogen introduction into the melt and removing as much as possible prior to casting.
Why aluminum degassing is Important
Aluminium and its alloys are susceptible to a unique form of chemical corrosion known as hydrogen-induced cracking, which is caused by the gradual diffusion of hydrogen (H) molecules through the metal’s crystal lattice. This creates a localised flaw within the alloy that can... less
Control the bubble-blowing height during the liquid degassing unit
The general refining method is to manually sprinkle Aluminum Flux into the furnace, and then stir and... moreControl the bubble-blowing height during the liquid degassing unit
The general refining method is to manually sprinkle Aluminum Flux into the furnace, and then stir and refine.
For the production of some alloys, nitrogen blowing refining (about 30 minutes) is required to drive the large fluctuations of liquid aluminum, so it is best to adjust the nitrogen pressure and control the height of the blowing bubble to 10-15mm.
Effectively dealing with the aluminum slag generated during the casting process
degassing unit is an inevitable part of the melting and casting process. Despite the relevant measures, a certain percentage of metal aluminum will be taken out.
Therefore, the smelter needs to effectively treat the aluminum slag.
The easiest and most economical method is to use mills to grind the aluminum slag repeatedly and then screen it, so as to effectively recover some aluminum beans.
Reduce the slope of the slag of the mixed furnace, and fully remove the aluminum slag out of the furnace.
The size of... less
degassing unit is a new type of porous ceramic material with a porosity of 80%-90% and a three-dimensional network skeleton structure and through-holes.
degassing unit’s... moredegassing unit is a new type of porous ceramic material with a porosity of 80%-90% and a three-dimensional network skeleton structure and through-holes.
degassing unit’s filtration and purification mechanism
1. Through mechanical filtration such as inertial collision interception and diffusion interception, friction, sedimentation, etc., the filtration efficiency is proportional to the pore size of the foam ceramics. 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 capacity of the mixed-phase particles increases with the increase of the deposition layer or the cake layer effect.
3. The rough surface formed due to the lack of gaps on the surface of the frame increases the interface between the flow of molten aluminum and the dignity of ceramic solids, making the flow direction of particles in the molten aluminum flow more disorderly, which is conducive to the... less
degassing unit is composed of open micropores with uniform pore size distribution and connected to each other. When the fluid passes through these micropores, the suspended... moredegassing unit is composed of open micropores with uniform pore size distribution and connected to each other. When the fluid passes through these micropores, the suspended matter in the fluid, colloidal particles, polymer organic matter, etc. is captured or absorbed in the micropores inside the road, so as to achieve the effect of purification and uniform filtration.
degassing unit for foundry has high strength, wear resistance, high-temperature resistance, corrosion resistance, no pollution, uniform pore size distribution, long service life, simple regeneration, and is used for aluminum liquid filtration and solid-liquid separation.
Light transmittance refers to the effective filter area of the ceramic filter plate product. The higher the light transmittance, the fewer blind holes, the more effective the filter hole (display hole), and the better the filter effect.
Place the degassing unit to be tested on a lightbox with a built-in 200W incandescent bulb, and use a 5.0 x 5.0 mm square... less
degassing unit or quality during the recycling process. Recycling aluminium also uses only 5% of the energy used to create new aluminium and emits only 5% of the greenhouse gases.... moredegassing unit or quality during the recycling process. Recycling aluminium also uses only 5% of the energy used to create new aluminium and emits only 5% of the greenhouse gases. It is for these reasons that approximately 75% of the aluminium ever produced is still in use today.
International Perspective
Recycling website by the International Aluminium Institute
The International Aluminium Institute released its Recycling website in 2011 and contains a wealth of information on recycling aluminium, as well as images, videos, downloadable reference material and links to external sites and more.
Recycling section on the Aluminum Association website
This section of the Aluminum Association’s (USA) website contains information on the benefits of recycling aluminium, some fun facts, teachers’ information, degassing unit and in-depth information.
Recycling page on the European Aluminium Association website
This is a single page on the EAA website. It contains information on the benefits and reasons why... less
Adtech offers a complete range of rotary degassing unit featuring the latest advancements in technology to meet your metal treatment needs. MMEI degassing product line includes... moreAdtech offers a complete range of rotary degassing unit featuring the latest advancements in technology to meet your metal treatment needs. MMEI degassing product line includes fully automatic ladle degassing stations, in-line units with single and multiple spinning rotors, portable units, and customized units for degassing over-the-road ladles and other large vessels.
Units are available with complete electric and gas controls which are easy to operate and are programmable to ensure repeatable results. Timers, temperature sensors, digital readouts and other enhancements are incorporated into control packages and designed to be operator friendly. MMEI gas controls include separate flow meters for both the purge and main gas. Gas flow is integrated into the electric controls for optimum operation. Gas controls are available for either inert gas or chlorine use.
Each degassing unit is engineered to exceed the difficult demands of the harsh foundry environment and can be custom built to meet your... less
ALP600 is a 3-level online degassing unit with triple rotors and 90° swing angle. This... moreALP600 Triple-Rotor Online AL Melt Degassing unit
ALP600 Main Application
ALP600 is a 3-level online degassing unit with triple rotors and 90° swing angle. This system can be installed on special designed degassing launder for online continuous degassing, suitable for continuous or semi-continuous casting. The 3 rotors can be lifted and controlled independently. The launder bowl is embedded baffles to form and separate independent degassing sections. Rotors can be lifted individually for consumable parts replacement without interfering other rotors’ degassing. The degassing box is opened with 3 dross-removal windows, no interfering to degassing. The system fits furnaces with a capacity of15 Kg/HALmelt flow. Degassing medium: 99.996% pure dry argon or nitrogen, can be provided directly by gas center. less
In this second blog in our series on foundry equipment and machinery, we will be looking at the degassing unit.
As we’ve explored in an earlier blog, degassing is used to... moreIn this second blog in our series on foundry equipment and machinery, we will be looking at the degassing unit.
As we’ve explored in an earlier blog, degassing is used to reduce the risk of gas porosity in aluminium sand casting. Porosity can occur when hydrogen is introduced into the metal during the melting stage. This can be drawn in through atmospheric humidity or moisture in the foundry.
In degassing, the molten metal is purged with nitrogen gas before the pouring stage. The nitrogen gas reacts with any hydrogen before dissipating from the molten metal.
Fast, effective degassing
At Haworth Castings, we use a hand-held rotary degasser – which has a rotating shaft and rotor at the base of a long narrow pole with handles. This unit is attached, through a tube, to a nitrogen canister.
The degassing unit is placed in the molten metal and, once operational, a high volume of bubbles is generated across a large surface area. This leads to the fast diffusion of hydrogen into the gas bubbles.... less
Molten aluminum is extremely reactive, so when it comes in contact with moist air or wet tools, the water decomposes to release hydrogen in the melt. Excessive quantities of this... moreMolten aluminum is extremely reactive, so when it comes in contact with moist air or wet tools, the water decomposes to release hydrogen in the melt. Excessive quantities of this dissolved gas have a well-documented detrimental effect on the mechanical properties of the final aluminum castings. What is also well known to anyone making castings is that dissolved gas has an overriding effect on the distribution and amount of porosity and shrinkage. Dissolved hydrogen levels must be controlled to minimize scrap. To control gas in aluminum, metalcasters must accomplish two things:
1. Prevent and minimize introduction of hydrogen in the melt.2. Measure and remove the hydrogen prior to pouring.This article will focus on measurement and removal.Gas Removal
The ability to degas molten aluminum is generally accomplished by using a purge gas, typically introduced into the melt by a rotary degassing unit. This degassing process is limited by thermodynamic laws; when purge gas bubbles are introduced to the melt,... less
Nitrogen Degassing Unit is used to reduce the oxide and hydrogen in the aluminum liquid, reduce the loss of aluminum and refining agent in the slag removal process, and also... moreNitrogen Degassing Unit is used to reduce the oxide and hydrogen in the aluminum liquid, reduce the loss of aluminum and refining agent in the slag removal process, and also reduce the oxide deposition on the furnace wall.Through automatic cycle refining timing and setting, automatic degassing and refining agent injection can be used respectively.
During the smelting process of aluminum alloy, molten aluminum, air and water vapor react to produce hydrogen and dissolve into the molten aluminum. When the molten aluminum solidifies, the hydrogen will be separated from the molten aluminum.
The hydrogen content and non-metallic inclusions of molten aluminum alloy in the melting and casting workshop will seriously affect the quality of the casting.Usually during the condensation process, as the solubility of hydrogen decreases, hydrogen has no time to escape from the solution, and non-metallic inclusions have no time to float to the surface before entering the crystallizer.In the subsequent rolling... less
