Aggregate

Crusher Product Gradation Charts

Aggregates required for a given job are generally specified by a full set of gradation limits and other relevant properties of the material. When rock is crushed, the product includes material of the size of the crusher setting, some slightly larger and the rest of the material smaller than the crusher setting. Crusher manufacturers publish grid charts, particle size cumulative distribution curves, and/or product size distribution tables to help predict the gradation of the crusher product. These charts, curves, and tables give the percentages passing or retained on standard size screens for each given setting of the crusher.

Screen Analysis of Product from Jaw Crusher, Percent Passing Screen Opening

Product

Size

(in.)

Closed Side Setting of Crusher (in.)

Product

Size

3/4

11.522.533.5456

(in.)

Over 10

….Read more

Crusher Efficiency Calculations

The following example demonstrates a method of selecting the components of an aggregate plant. Good component efficiency and part performance pre-evaluation is essential to a solid design. The aggregate production requires the consideration of several crushers, feeders and screens. This is not intended to be a typical situation, though it does involve common crusher and screen units often used in aggregate plants.

Crushing & Screening Plant Assessment Example

Quarry rock of 12 in. maximum size is to be handled in a two-stage crusher plant at the rate of 70 tons per hour. The maximum size of output is to be 1½ in., and separation of materials over 1 in. size and the minus 1 in. in the output is required. Select a jaw crusher like those included in this table.

Capacities and Horsepower of Jaw Crushers (tons/hr)

Crusher

Size

(in.)

Power

Required

(hp)

Closed Side Setting (in.)

2

3456789

10

2036

7545….Read more

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