[China Aluminum Network] Aluminum ash is an inevitable product of smelting. It consists of aluminum oxide, aluminum nitride, other oxides, chlorides and aluminum.
The quality of the slag treatment has a great impact on the economic benefits of the recycled aluminum industry. The amount of aluminum contained in the aluminum ash removed from the furnace is 45% to 75%, because the amount of aluminum ash is about 15% of the amount of melting in the furnace. Therefore, how to increase the amount of aluminum recovered from the aluminum ash is regenerated. Aluminum industry is an important issue.
The aluminum recovery rate in aluminum ash slag is closely related to the cost of recycled aluminum products. Taking a factory with a monthly melting capacity of 3,000 tons as an example, the output of aluminum ash slag can reach 450 tons, and the aluminum content is 202.5 to 337.5 tons. The recovery rate of aluminum is 45%, and the recovery of aluminum is 90~152t. If the recovery rate is 70%, the recycled aluminum can reach 142~236t, with a difference of 52~84t. This difference is equivalent to gross margin of 2%~3%. However, the recovery of aluminum from aluminum ash dross has a higher recovery rate, ie 70% recovery, and the remaining residue is difficult to handle. Aluminum ash containing more than 30% aluminum can be used as a deoxidizer for steelmaking. . Therefore, most recycled aluminum companies now avoid excessive recycling of aluminum ash. Instead, they sell aluminum slag to aluminum slag treatment plants or steelmaking deoxidizer plants.
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