The aluminum melt refining in furnace is carried out in two steps:
The first step is pre-refining in the melting furnace. When the chemical composition and temperature of the aluminum alloy liquid in the melting furnace meet the requirements, the high-purity argon gas is used as the carrier to pass the refining agent into the aluminum melt for pre-refining to remove most of the oxide inclusions and dissolved hydrogen in the melt.
The second step is refining in the holding furnace. When the melt is introduced into the holding furnace, after the temperature reaches the required temperature, the high-purity argon gas is used as a carrier to pass the refining agent into the aluminum melt, and the refining tube is used to move back and forth in different parts of the melt to ensure the uniformity of the melt refining.
During the refining process, the refining gas pressure should be adjusted and the depth of the refining tube immersed in the molten aluminum. It also should be controlled to ensure that the molten aluminum tossing height is less than 50 mm, and the oxidation slagging and gas absorption of the molten alloy during the refining process should be controlled to a minimum.
After the refining is completed, the slagging agent calculated in advance is added to the alloy liquid, the slagging is stirred, and the solution is covered with sodium and calcium-free covering agent. After standing for 15-20 minutes, the aluminum alloy round ingot can cast.
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