The main principle of aluminum ash thermal treatment technology is to remove aluminum from high aluminum ash, and then purify low aluminum ash under high temperature conditions. First, a small amount of remaining aluminum and aluminum nitride are converted into aluminum oxide, and at the same time, the inorganic salt impurities in them are volatilized to improve the purity of aluminum oxide in the product and obtain crude aluminum oxide products. Auxiliary materials can also be added to continue to prepare high value-added materials. The evaporated inorganic salts can be reused as slagging agent after condensation, and the exhaust is discharged after a series of treatment.
Aluminum ash has been clearly listed as hazardous waste due to toxicity and reactivity. However, aluminum and other oxides in aluminum ash have high recycling value. If aluminum ash can be used with high value, it can not only solve the problem of hazardous aluminum ash waste, but also create additional economic value, which will have broad market prospects.
