You should have a copper key by now as well...
If your magic ability is high enough, try using your spells that youve found on the scrolls.
Also have you figured out:
"round, Around, round,
Round, around, Round,
negates gates traits"
If not, that could be where youre having trouble.
I'll give you another hint, when you unlock certain puzzles you will get a red flash that lets you know they are complete....
Be sure you are consuming all the verdites and magic essences you find.