- What is concentration? What fineness?
- What is the particle size? What is the grain size? What is the mesh?
- What is the gangue? What is the surrounding rock and what is waste rock?
- What is the useful minerals and what is the use?
- Sheave wheel
- Set complete range
- Set complete
- Selective mining
- Seismic prospecting
- Secondary deposit
- Screening equipment
- Scintillation counter
- Run of mine (ROM)
- Run of quarry (ROQ)
- What is the crushing ratio (size reduction ratio)?
What is the crushing ratio (size reduction ratio)?
Crushing ratio (size reduction ratio): way of measuring Crusher crushing effects, common reduction ratio of the concept. Crusher’s crushing ratio is ratio of raw material particle size and broken product accuracy. It expresses garbage reduced level after crushing.
Size reduction equipment
Size reduction equipment is divided into crushers, grinders, ultrafine grinders, and cutting machines. Crusher do the heavy work of breaking large pieces of solid material into small lumps. A primary crusher operates on run-of -mine material accepting anything that comes from mine face and breaking it into 150 to 250 mm lumps. A secondary crusher reduces these lumps into particles perhaps 6mm in size. Grinders reduce crushed feed to powder. The product from an intermediate grinder might pass a 40-mesh screen; most of the product from a fine grinder would pass a 200-mesh screen with a 74m m opening. An ultrafine grinder accepts feed particles no larger tbm 6mm and the product size is typically 1 to 5m m. Cutters give particles of definite size and shape, 2 to 10mm in length.
The principal types of size-reduction machines are as follows:
A. Crushers (coarse and fine)
B. Grinders (intermediate and fine)
Hammer mills; impactors
C. Ultrafine grinders
Hammer mills with internal classification
For example, the three sections broken, the paragraphs broken to i1 of i2, i3 said, is the total crushing ratio i = i1xi2xi3 certain amount of broken equipment, its broken range must, therefore, the total crushing tbm is often given a broken segment number.
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