Suggest three fundamentally different ways of producing aluminum nitrate in one stage

Laboratory methods of obtaining:

8Al + 30HNO3 = Al (NO3) 3 + 3N2O + 15H2O

Al2 (SO4) 3 + 3Ba (NO3) 2 = 2Al (NO3) 3 + 3BaSO4

Industrial method of obtaining:

Al (OH) 3 + 3N2O5 = Al (NO3) 3 + 3HNO3.

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