What are copper ore ball mill open-circuit grinding and closed-circuit grinding?

Copper ore ball mill open-circuit grinding: the material is fed into the ball mill and discharged directly into the next mill or processed after one-time grinding and discharge.
Copper ore ball mill closed-circuit grinding: the material is fed into the mill to be graded after one-time grinding, the unqualified ore is returned to the mill for regrinding, and the qualified ore is fed into the next stage.
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