Method for directly preparing aluminum foil through low temperature electrolysis

Abstract

The invention discloses a method for directly preparing an aluminum foil through electrolysis at low temperature in an ionic liquid medium.Not only is the problem that a compact deposition layer is difficult to strip in the electrodeposition process of metallic aluminum in ionic liquid solved, but also a novel approach is provided for electrochemical preparation of the aluminum foil.The method is characterized in that a higher nucleation overpotential of metallic aluminum on a carbon cathode is utilized, a compact deposition layer is formed, and meanwhile the compatibility between the metallic aluminum and carbon material lattices is poor, so that the compact aluminum foil on the surface of the cathode is easy to strip.According to the method for directly preparing the aluminum foil through electrolysis, the low-temperature ionic liquid serves as the electrolyte, a carbon material with a smooth surface serves as the cathode, and by means of the characteristics that the ionic liquid is low in melting point and not prone to volatilization, the metallic aluminum foil is successfully prepared within the low-temperature range of 25 DEG C-100 DEG C.The method for directly preparing the aluminum foil through electrolysis has the advantages that the operation temperature is low, and the technological steps are simple and easy to operate; continuous production is easy to achieve, and the production energy consumption and cost of the aluminum and the aluminum foil can be significantly reduced.The method has a good application prospect in the aspect of preparation of the metallic aluminum and aluminum foil through low-temperature electrolysis.

Description

technical field [0001] The invention belongs to the field of electrolysis and relates to a new method for preparing aluminum foil by low-temperature electrodeposition. Background technique [0002] The aluminum industry is one of the largest electrochemical industries in the world. Because of its excellent properties such as low density and strong plasticity, the output of primary aluminum and the amount of recycled aluminum are also growing rapidly. By the end of 2014, the world's annual output of electrolytic aluminum had reached 53.9 million tons, and China's output of electrolytic aluminum accounted for about 45% of the world's total output. Because the reduction potential of aluminum is relatively negative (less than the precipitation potential of hydrogen), it cannot be electrolyzed in aqueous solution like Cu, Zn, Pb and other non-ferrous metals. In the past more than a hundred years, the production of primary aluminum has adopted the Hall-Héroult method (Hall-Héroul...

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Problems solved by technology

It is worth noting that the dense deposition layer obtained by the above method is all on the metal surface. Since the metal cathode and the aluminum deposition layer have a good lattice match, the deposition layer is difficult to peel off from the substrate, so this method is only suitable for the metal surface. Modification, difficult to use in electrolysis or refining processes for aluminum products

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