Question about de Buyer Mineral B Element

Rather not. Basically, this pan needs a so-called "seasoning" before it can be used, i.e. fats are burnt in so that a protective layer is created. This would probably be destroyed in the dishwasher and you would have to start all over again.
There are many instructions on Youtube, one of which is: https://www.youtube.com/watch
I hope this helps.