15 Questions
What is another term for mineral processing?
Ore dressing
What is the main purpose of concentration in mineral processing?
To remove gangue particles from ore
How is size separation of ore achieved for finer particles in slurry form?
Centrifugal classifiers
What is the main objective of comminution in mineral processing?
To liberate valuable minerals from gangue
What is the initial stage of comminution in mineral processing?
Crushing
Which type of crushers operate in open circuit?
Jaw crushers
What is the main equipment used for secondary/tertiary crushing in closed circuit?
Cone crushers
What is the final stage of comminution in mineral processing?
Grinding
Which type of mills use steel rods for primary grinding?
Rod mills
In which type of mills are steel balls used for secondary grinding?
Ball mills
What type of mills use a combination of ore and steel balls as grinding media?
Semi-autogenous mills
What technology is used for size separation of coarse dry ore?
Vibrating screens
What technology is used for size separation of finer ore in slurry form?
Centrifugal classifiers
What is the aim of size separation in mining?
To separate ore into undersize and oversize
Who is the author of the text on mineral processing and comminution in mining?
Ahlam Maremi
Study Notes
Mineral Processing and Comminution in Mining
- Mineral processing involves separating valuable minerals from gangue using physical and surface properties.
- Crushing is the initial stage of comminution, typically done in two or three stages of size reduction.
- Comminution circuits can be open or closed, with primary crushers operating in open circuit.
- Primary crushers include jaw crushers (with swinging steel jaws) and gyratory crushers (with a conically shaped crushing head).
- Secondary/tertiary crushing is mainly performed by cone crushers in closed circuit.
- Grinding is the final stage of comminution, commonly performed in rod mills, ball mills, or semi-autogenous mills.
- Rod mills use steel rods for primary grinding and operate in open circuit.
- Ball mills use steel balls for secondary grinding and are operated in closed circuit.
- Semi-autogenous mills use a combination of ore and steel balls as grinding media.
- Size separation technologies in mining include vibrating screens for coarse dry ore and centrifugal classifiers for finer ore in slurry form.
- Size separation aims to separate ore into undersize (smaller than desired) and oversize (requires further size reduction).
- The text is authored by Ahlam Maremi from the Mining Optimization Laboratory.
Test your knowledge of mineral processing and comminution in mining with this quiz. Explore topics such as crushing, grinding, and size separation technologies, and learn about the different stages and equipment involved in the process.
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