Dana, I am not Karl, but I will give you some advice.
Go over the blade with your belt sander, the finest grit you have, all in one direction, and then clamp in in your vice.
Buy some sandpaper designed for METAL, not wood. Get three or four 6" x 2" x 1" thick blocks of wood. Now, use thumb tacks, or small nails to secure your sandpaper to your board.
I go 320,400,800,1000, in opposite directions,until all scratches from the previous grit are gone, before continueing to the next grit, with lots of WD-40 for lubrication.
Keep wiping the WD-40 off when it turns black from steel filings, respray generously, and continue sanding. It will take a LONG time. A knife I recently finished has two hours of hand sanding in it.
But, I will say its a fair bet that you will be happy with your blades using this method.
The Kid