Shakeout

noun

1. An event that causes marginal constituents to be eliminated.

   "The dot-com shakeout of the 1990s left only the most durable, most profitable, and most well backed companies surviving."

2. The separation of molds from their flask, the castings from the molding sand, and potentially the cores from the castings.
3. The shaking of an object to spread it wide and eject any debris.