Online Degassing Unit
About This Project
Degassing Unit
AdTech is an enterprise specialized in new material development and high precision online degassing unit production since 2012, and got positive feedback from domestic and overseas markets.
The online degassing unit adopts advanced high silicon melting technology to get a long service time, degassing rotor, heater protection thimble, and thermocouple protection thimble adopt ceramic manufacturing technology which can meet producing high-precision aluminum requirements.
An online degassing unit shall be installed between the furnace and casting equipment. It is used for hydrogen (H) and slags removal from molten aluminum. The online degassing unit has dual functions: processing and heating. It serves high precision molten aluminum purification industry.
Degassing unit-AOE
Assembling of Online Degassing unit:
- Mechanical Drive
- Degassing Box &Cover
- Rotor &Heater
- Electric Control
Parameters of Online Degassing unit:
| Max Degassing flow MT/H |
15 MT/H | 35 MT/H | 65 MT/H |
|---|---|---|---|
| Degassing Box Standard | 1 room 1 rotor （1B1R） | 2 rooms 2 rotors（2B2R） | 3 rooms 3 rotors（3B3R） |
| Degassing box structure | 1 draining outlet & 1 deslagging outlet | 2 draining outlets & 1 deslagging outlet | 3 draining outlets 1 deslagging outlet |
| Lifting System | Hoisting type | Rotor mechanical lifting | cover hydraulic lifting |
Online degassing unit performance:
It is mainly used for hydrogen (H) and slags removal from molten aluminum.
It takes the gas flotation principle. The rotor takes inert gas or a mixture of chlorine and inert gas into molten aluminum and smashes the gas into dispersed tiny bubbles, the bubbles rise to the molten aluminum surface and finish the below-stated procedures at the same time:
- H is being absorbed in bubbles and is being removed.
- The chloride is removed (formed by chemical action with an alkali metal and chlorine gas).
- Remove slags.
| The efficiency of degassing unit | Average Degassing efficiency is 60%. If use Ar and Mg content ≤1%, the efficiency can reach 0.09cc/100g. |
|---|---|
| The lining structure of the degassing unit | The lining is made of high silicon molten material, average working life is 2-3 years. It is featured nonstick aluminum, with no contamination. There is a float stopper inside to prevent oxides from being drawn into molten aluminum and the bubbles or slags from running out. |
| The design standards for rotor in degassing unit | It is made of SiN. Working life is 2-5 years. It performs well in corrosion resistance, heat shock resistance, oxidative resistance, abrasive resistance, and mechanical strength. Shaft diameter 60mm, head diameter 200mm, which shall reduce resistance in stirring. Speed design 450-550 R/M will crush bubbles and disperse them evenly into aluminum. It is cost-effective during long-time usage. |
| Intrusive heater protection thimble | It is made from SiN, Average service life is 1-2years, featured high heating efficiency, oxidation, and slagging prevention, and no contaminations. |
| The gas protection design for degassing unit | Ar mix of N2 and chlorine is available, protection method is also designed. |
| Sealing structure design for degassing unit | The sealing structure includes cover, lining, inlet, and outlet to prevent slag and improve degassing efficiency. |
Operation Schematic Diagrams:
Instruction：
- Switch off the heating unit after degassing box heating is completed. Guide inert gas into the rotor and release molten aluminum into the box when the heater temperature is closed to molten aluminum temperature.
- Check the sealing between inlet/outlet and launder.
- Check the cone located in heat protection draining in the bottom.
- Check the molten aluminum temperature (min 720°C). Make the height of molten aluminum be away from the launder bottom at 3cm for observing the molten aluminum going into the box.
- The operator shall wear protective clothes to close the cover. The slag on the surface can be skimmed through the deslagging outlet when the molten aluminum flows into the box.
- Start production when the temperature is up to 780°C. Close deslagging outlet for heating preservation.
- Molten aluminum can be retained in the box with setting temperature during the heat preservation phase but with no molten aluminum handling.
- Guide inert gases into the rotor to prevent air outlet blocking by molten aluminum.
- Switch on the heater as soon as molten aluminum flow into the box is completed and set heat preservation parameters.
- Starting the heating system, control the temperature of the molten aluminum, monitor the gas flow rate, and the speed of the rotor is changed from the heat preservation stage to the processing stage. At the same time, the inert gas flow into the rotor increases, and the gas flow rate is changed from the preservation stage to the processing stage.
- The operator sets the molten aluminum heating temperature and maintains a stable degassing working condition.
Online degassing unit service life：
Lining≥ 2 years;
The whole unit except wearing parts≥5 years.