The floatation method is usually used for degassing aluminum. AdTech online rotary degassing unit adopts the floatation method to remove hydrogen in molten aluminum. The principle is to pass a certain non-hydrogen-free gas into the aluminum alloy liquid to generate bubbles, and use these bubbles to take the dissolved hydrogen out of the aluminum alloy liquid and escape into the atmosphere during the floating process. In order to get a better degassing refining effect, the iron pipe that introduces the gas should be pressed into the depth of the molten pool as much as possible, and the lower end of the iron pipe should be 100-150mm from the bottom of the furnace, so as to lengthen the stroke of the bubbles floating up, and at the same time not to sink in The inclusions at the bottom of the molten aluminum are stirred up.
When the gas is introduced, the iron pipe should be moved slowly and laterally in the aluminum alloy liquid, so that there are bubbles passing through the molten pool. Try to use a lower and appropriate ventilation pressure and speed, because the bubbles formed in this way are smaller, which enlarges the surface area of the bubbles, and because the bubbles are small, the floating speed is also slow, and more inclusions and gases can be removed. At the same time, in order to ensure a good refining effect, the selection of the refining temperature should be appropriate. If the temperature is too high, the bubbles generated will be larger and will rise quickly, making the refining effect worse. When the temperature is too low, the viscosity of the aluminum alloy liquid is relatively large, which is not conducive to the full exhaust of the gas in the aluminum alloy liquid and reduces the refining effect.
Ultrasonic treatment of aluminum alloy liquid can effectively degas. The principle is that by passing vibration waves into the aluminum alloy liquid, the phenomenon of “cavitation” is caused in the aluminum alloy liquid, which destroys the continuity of the structure of the aluminum alloy liquid, and produces numerous microscopic vacuum holes, which are dissolved in the aluminum alloy. The hydrogen in the liquid quickly escapes into these cavities to form a bubble core, which continues to grow and escapes out of the aluminum alloy liquid in a bubble shape to achieve a refining effect.
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