I think you're out of luck on finding a mower blade that mulches pine needles. I've tried a few including Predators'., Hig Lift, etc.. About all they do is to move the needles around. Chop them up? Nope. For 'gone', I think you're looking at raking and hauling.
Personally, I've learned to like pine needles somewhat. They're great for pathway covering, flower beds, blueberry tree groves, and floor covering for just about any animal bedding.
We see more yard-guys driving around pulling trailer-loads of pine needles to distribute to customers for flower beds and tree surrounds. I suspect there's better money in that than in mowing grass.
We, here in mid-Georgia, have a full plate load of pine trees, of every variety. We, naturally, also have a plate load of pine needles every year. We've simply learned that they're a part of the local environment and learned to enjoy them as if they were here before we were. Now..., if we could find some way to turn this red clay soil into nice black loam dirt, we'd be whistling Dixie. hmmm - well, I suppose we already are!