Lesson 1/Learning Event 3
The washing unit (Figure 15) receives material from the first intermediate unit, washes it, claims
product size aggregates, and accomplishes a third stage of reduction to oversize particles. It also washes and
classifies sand.
FIGURE 15. MATERIAL FLOW THROUGH THE CRUSHING,
SCREENING, AND WASHING UNIT OF A 225-tph
CRUSHING AND SCREENING PLANT
The second intermediate unit (Figure 16) is a special crushing and screening unit normally used in the
washing plant return system. It is used to increase production of fines (or sand) by taking material from the roll
crusher, and from the bottom deck screen of the washing plant, reducing it to the sand size, and returning it to the
feeder system of the washing unit. It is used either as a wet or dry operation.
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