— The primary crusher is used to reduce the size of large rocks and stones, while the secondary crusher further breaks them down into smaller pieces. In this article, we will discuss the primary crusher and secondary …

 — Learn the differences between primary and secondary crushing and how to choose the right crusher for your mining or construction project. This guide explains the basics of crushing, the factors that determine the choice of crusher, and more.

The larger crushers are normally known as primary crushers as they are designed to receive run-on-mine (ROM) rocks directly from the mines. The gyratory crushers crush to reduce the size by a maximum of about one-tenth its size.

The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. Feed: ROM up to 1.5 m; Product: -300mm (for transport) to -200mm (for SAG mill) Feed Rate: 160 to 13,000 tph

Primary crushing brings run-of-mine ore down to a maximum size of the order 4″ to 6″ in average diameter; secondary crushing receives feed at −6″ and reduces it to below "Dry" crushing includes work on ore as mined, which may be somewhat moist when delivered.

 — Learn everything you need to know about primary crushing, secondary crushing, and tertiary crushing in this comprehensive guide. Discover the types of crushers used in each stage, their working principles, and …

Crushers for Bulk Materials. Crushers and breakers are used to reduce size of mined and quarried material for further processing or to size suitable for the intended end use. The goal of a crusher is to crush the given material in to the material with certain size and shape.

The primary crusher is the link between chemical comminution (blasting) and the beginning of the mechanical comminution circuit (crushing and milling). The primary crushers take blasted, run-of-mine, or run-of-quarry feed up to 1500 mm and produce a product ranging in size from -300 mm for conveyor transport, or -200 mm for SAG mill feed.

 — There are two main types of primary crushers-gyratory crushers and jaw crushers. Gyratory crushers are the most common for new operations. Secondary crushers are lighter-duty and include cone crushers, roll crushers, and impact crushers.

A primary crusher is designed to receive run-on-mine (ROM) rocks directly from the mines. Gyratory crushers typically crush to reduce the size of aggregate to a maximum of about one-tenth of its original size.