To make chalk, limestone is first quarried, generally by an open pit quarry method. Next, the limestone must be crushed. Primary crushing, such as in a jaw crusher, breaks down large boulders; secondary crushing pulverizes smaller chunks into pebbles.
A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust.. Crushers may be used to reduce the size, or change the form, of waste materials so they can be more easily disposed of or recycled, or to reduce the size of a solid mix of raw materials (as in rock ore), so that pieces of different composition can be differentiated.
Jaggery is a traditional non-centrifugal cane sugar consumed in South Asia, Southeast Asia and some other countries in Asia and the Americas. It is a concentrated product of cane juice and often date or palm sap (see: palm sugar) without separation of the molasses and crystals, and can vary from golden brown to dark brown in colour.
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