Practice Exercise for Lesson 2 -Cont.

Lesson 2/Practice Exercise

your unit's capacity to produce the aggregate if there are two 75-tph rock crushing plants available. Production

must meet the following specifications:

Size

Percent Passing

2"

100%

1 3/4"

90-100%

1 1/4"

50-80%

3/4"

30-55%

1/2"

10-40%

3/8"

0-15%

1/4"

0-5%

The quarry rock is fine-grained granite rock. The shell-types in the rolls are both fine corrugated and smooth

(FC/S). Roll crushers are 30 by 24 inches. Jaw crushers are 20 by 36 inches. There is one secondary unit in each

plant, no washing.

3.

Select your top and bottom screens.

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4.

What should your roll crusher setting be? Give the product setting, stage of reduction, and maximum

feed size.

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5.

What should you se the jaw crusher at?

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6.

Determine the jaw crusher production. Give the material hardness production factor and the jaw capacity.

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7.

Calculate the roil crusher production.

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