Progress in Industrial Aluminum Ash Treatment and Recycling Technology
This paper introduces the sources,composition,and classification of aluminum ash,describes the current status of primary aluminum ash and secondary aluminum treatment technologies,analyzes commonly-used secondary aluminum ash recycling technologies,such as hydrometallurgical treatment technology,two-stage continuous treatment technology,and pyrometallurgical treatment technology,and makes some comparisons.On this basis,an integrated treatment technology for aluminum ash is proposed,which includes"two grinding and two screening+aluminum extraction by ash treatment+high-temperature catalytic denitrification and fluorine fixation+water washing for dechlorination+crystallization for salt recovery".This technology can achieve efficient recovery of valuable metals in aluminum ash,solve the activity problem of aluminum nitride in aluminum ash,reduce the leaching toxicity of secondary aluminum ash and dust ash,and ultimately achieve harmless treatment and green recycling of secondary aluminum ash.
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