Lesson 1/Learning Event 2
FIGURE 5. SPLITTING
Limitations: When these expedients are applied to the top screen in a dosed circuit crushing system,
the effects will be compounded. Damming will result in less oversize material being scalped off and sent through
the dual roll crusher. This means that somewhat less additional fines will be produced. Splitting results in more
material being sent to the roll crusher so that more additional fines will be generated. While these actions will
enable close control over graded sizes produced, overall production rates may be reduced to the same extent that
screen capacity is decreased.
Function and Operation. The crushers, screens, and washing equipment are the key items in aggregate
production operations. Effective operation, however, requires some means of regulating the flow of material
being processed, transporting it from one component of the plant to another, and conveying it to the stockpile.
Mechanical feeders and rubber belt conveyors are used to accomplish these materials handling functions.