Reciprocating screens — suitability limits:\nReciprocating screens (gyratory at feed end, reciprocating at discharge) are generally NOT suitable for screening which material/service?

Introduction / Context:
Screen types differ in motion, stroke, and robustness. Reciprocating/gyratory screens provide gentle, accurate sizing with low vertical acceleration—excellent for fragile or light materials. For heavy, abrasive rock at large tonnage, more rugged vibrating or inclined screens are preferred to withstand impact and high throughput.

Given Data / Assumptions:

• Reciprocating screens combine gentle gyratory feed action and reciprocating discharge motion.
• Material choices span light powders to heavy rock.

Concept / Approach:
The low-intensity motion of reciprocating/gyratory screens promotes stratification and precise cuts with minimal degradation but lacks the dynamic capacity to process very heavy, coarse rock at high rates. Vibrating screens (linear or circular) give higher accelerations and capacities, making them standard in aggregates and mining for large tonnage rock screening.

Step-by-Step Solution:

Verification / Alternative check:
Aggregate plant flowsheets almost exclusively use heavy-duty vibrating screens for primary/secondary scalping and sizing, not reciprocating types.

Why Other Options Are Wrong:

• Light powders, chemicals, foods, pellets: commonly processed on gyratory/reciprocating screens.

Common Pitfalls:
Attempting to scale reciprocating screens into high-impact services leads to rapid wear and blinding.

Final Answer:
Heavy tonnages of rocks or gravel