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. Crushing is the process of transferring a force amplified by mechanical advantage through a material made of molecules that bond together more strongly, and resist deformation more, than those in the material being crushed do.

In industry, crushers are machines which use a metal surface to break or compress materials. Mining operations use crushers, commonly classified by the degree to which they fragment the starting material, with primary and secondary crushers handling coarse materials, and tertiary and quaternary crushers reducing ore particles to finer gradations. Each crusher is designed to work with a certain maximum size of raw material, and often delivers its output to a screening machine which sorts and directs the product for further processing. Typically, crushing stages are followed by milling stages if the materials need to be further reduced.

Now let’s take a look at the gold mining processing, it can be divided into two parts:

1. Physical processes: Crushing and Grinding

Ore is transported from the mine and stored in stockpiles near the processing plant. The ore is passed through a three-stage crushing circuit and then through the grinding mill to reduce the size of the ore (physical processing).screw classifiers:http://www.jaw-breakers.com/T60.html
cement machinery:http://www.hx-crusher.com/cement_production_line.html

2. Chemical processes: chemical breakdown of ore to enable the extraction of gold.

The gold is recovered from the ore by leaching, elution, and then via the electrowinning cell (chemical processing).

Jaw Crusher and Cone Crusher for gold mining process:

In 3-stage crushing process, Jaw Crusher is used as primary crusher while cone crusher is secondary and tertiary crushers. Rocks are crushed between a fixed jaw and a moving jaw within the jaw crusher. And rocks are crushed to a size generally less than 20 cm. Feed size to a jaw crusher can range from 50 – 300mm; discharge sizes are between 10 – 70mm. Jaw crushers are typically sized by the size of the largest feed particle–if the rocks are large, the crusher must be large. Jaw crushers are very common in artisanal gold mines. A small crusher operating in batches of 5 to 10 tonnes of ore and handling 500 kg/h to reduce it to -1/4” (6.5 mm) is suitable for most artisanal mining operations.

A cone crusher has a central solid steel cone shape within a steel casing. The solid cone shape moves back and forth and around within the steel casing. In the cone crusher rocks are crushed to around 2 cm. As the professional mining machine manufacture in the world, Hongxing Machinery can provide you the perfect machine.