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Explanation: I think that "criba" and "lavado" can be assumed as the same general process. In fact, a "trommel" is a cylindrical screen.
"lavado" could refer more to a sort of "decantation" of materials, but I think that "screening" could be a good solution for both terms.
Luis Crespo Local time: 20:37 Native speaker of: Spanish PRO pts in pair: 64