Grizzlies (stationary bar screens) are used in screening operations primarily to separate which size class of solids before downstream crushing or screening?

Introduction / Context:
Grizzlies are robust bar screens installed ahead of crushers to scalp oversize lumps and protect downstream equipment.

Given Data / Assumptions:

• Stationary, widely spaced bars.
• Used at the front end of a crushing plant.

Concept / Approach:
Because of their large bar spacing and rugged design, grizzlies remove very coarse rocks and tramp material. Fines pass through to subsequent screens or crushers, improving throughput and reducing wear.

Step-by-Step Solution:
Identify application: scalping.Associate with large opening sizes.Select “coarse.”

Verification / Alternative check:
Plant layouts show grizzlies directly above hoppers or primary crushers for oversize removal.

Why Other Options Are Wrong:
Fine/ultrafine: grizzlies lack the small apertures required.Any size/none: inaccurate.

Common Pitfalls:
Confusing grizzlies with vibrating decks used for finer separations.

Final Answer:
Coarse