Il n'y a pas de frais de recyclage ou d'élimination pour la batterie au sodium. Si une batterie au sodium est endommagée ou ne fonctionne plus après une longue période de travail, elle doit être retirée et transportée chez le fabricant à Stabio/CH. Ces coûts sont à la charge du client. À Stabio, les batteries sont collectées jusqu'à ce qu'un conteneur soit plein. Les batteries sont ensuite entièrement recyclées et les matières premières récupérées sont acheminées vers l'industrie métallurgique et l'industrie du bâtiment.
The salt battery manufacturer collects the old batteries until a container is full. After that, the batteries are recycled in the following steps:
- Shredding the batteries
- Melting out the shredded parts in the blast furnace - the salt and the ceramics form the slag which protects the melt from the oxygen
- The metal ingots (iron and nickel) produced from the smelting are further used for stainless steel production
- The slag is used in the construction industry for road building
The salt battery does not contain any metallic aluminium, but only the salt sodium aluminium chloride (NaAlCl4), which acts as a liquid electrolyte salt. It is formed from the chemical reaction with common salt (NaCl) and the chloride of aluminium, the salt aluminium chloride (AlCl3).
A large number of chemical compounds of aluminium exist. In nature, it is contained in large quantities of rocks. Natural aluminium compounds are part of the earth's crust (eight percent by weight), for example in feldspars and mica as well as their weathering products clay and bauxite.
Artificially produced, it is used in numerous industrial processes. As a result of its strong chemical affinity (the tendency to chemical reactions), aluminium does not occur in nature in pure form, but only in compounds – with very different properties from aluminium.
Aluminium chloride is a colourless crystal that is easily soluble in water – i.e. a salt. It is the most commonly used catalyst (substance that accelerates chemical reactions without participating in them) in the production of organic substances.
This small amount of bound aluminium is necessary to reduce the melting point of the table salt, because salt without addition has a melting point of over 800° C.
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