Workshop system and technology for producing aluminum hydroxide from corrosive wash liquid
An aluminum hydroxide and generation system technology, applied in the field of aluminum processing, can solve the problems of waste of resources, environmental hazards, and increased tank voltage, and achieve the effects of reducing labor intensity, restoring production capacity, and reducing cleaning water.
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[0096] The technical solutions of the present invention will be further described below in conjunction with the drawings and specific implementations.
[0097] The theoretical basis for the production of aluminum hydroxide by recovering aluminum ions from the boiler mold waste liquid:
[0098] When the mold is burned, the aluminum head in the abrasive tool undergoes the following chemical reactions in the alkaline etching solution:
[0099] Al 2 O 3 +2NaOH=2NaAlO 2 +H 2 O (to remove natural oxide film) (1)
[0100] 2Al+2NaOH+2H 2 O=2NaAlO 2 +3H 2 ↑(Molten aluminum) (2)
[0101] NaAlO 2 +2H 2 O=Al(OH) 3 ↓+NaOH (decomposition of bath solution, regeneration of lye) (3)
[0102] 2Al(OH) 3 =Al 2 O 3 .3H 2 O (scaling on the tank wall, clogged pipe) (4)
[0103] According to the two formulas (1) and (2), the higher the alkali concentration, the faster the aluminum dissolving speed; according to the two formulas (3) and (4), the potting liquid is unstable, easy to decompose, and scale. According...
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