This has the bad habit of getting very very hot and accelerating the production as it heats up. I think the vapor also tends to suck along some of the hydroxide, so you may want to clean and cool it before using it in a cell. This method uses the hydroxide to dissolve the aluminum hydroxide that is formed. The aluminum is actually burning the oxygen from the water in the cell. The hydrochloric acid method is amenable to adding acid from a funnel column to obtain a self regulating pressure source.
Pressure drops, the weight of the column forces more acid in and increases the production rate.
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