The molten aluminum degasser machine rotates at high speed through the silicon nitride rotor and injects inert gases (argon and nitrogen) to make it evenly dispersed in the molten aluminum alloy liquid.
The diameter of inert bubbles will decrease, but the total surface area of bubbles will increase sharply.
Through more inert bubbles and extensive contact with hydrogen and impurities in aluminum alloy liquid, harmful substances in aluminum alloy liquid can be brought to the surface of molten liquid.
Molten Aluminum Degasser Machine
It is difficult to control the impurities (hydrogen, alkali metal, non-metallic inclusions) in the melt due to its limited purification effect and secondary pollution during the melt flow. The porosity and inclusion in ingot seriously affect its internal quality, which leads to a decrease in aluminum production.
The molten aluminum degasser treatment tank consists of two internal cavities, a clean room, and a heating and holding chamber, separated by SiC partitions.
The bottom of the two chambers is connected. After degassing the aluminum alloy liquid and removing the slag in the clean room, the aluminum alloy liquid will flow into the insulation room from the bottom of the partition board for insulation.
The U-type silicon carbide protective tube is used in the insulation room, which is immersed in the aluminum alloy liquid. The shell of the heating box is made of 10 mm steel plate.
The lining and refractory are cast as a whole. The upper part of the side wall is provided with a slag discharge port, and the bottom part is provided with a slag discharge port.
Lifting System of Molten Aluminum Degasser Machine
To ensure accurate positioning, two hydraulic cylinders are used as lifting devices to control the vertical up and down movement of the rotor and heating system of the U-shaped silicon carbide heater.
It can rotate 90 ° horizontally, the hydraulic system is relatively stable and the positioning is accurate.
Molten Aluminum Degasser Heating System
The heating system adopts immersion heater, U-shaped silicon carbide rod and cylindrical silicon carbide or silicon nitride protection tube. The tube is equipped with temperature measuring thermocouple, which can realize automatic temperature control, and the power can be adjusted arbitrarily from 2kW to 26KW.
The temperature control system adopts more advanced power integration unit to realize automatic control, which avoids the shortage of buffer stage when the heater is on and off. When the U-shaped SiC heater is frequently switched on and off, it will be continuously affected by the main current. In the non buffering stage, the heater is easy to be aged and its life is short.
