What is the purpose of primary crushing in ore processing?

What is the purpose of primary crushing in ore processing?

• A. To sort ore by color
• B. To reduce newly mined ore to a manageable size
• C. To separate diamonds from gangue by density
• D. To transport ore to the plant

Answer: (B)

The main idea is that primary crushing exists to reduce large, unprocessed ore into a size that can be handled and fed into the next stages of processing. By bringing big rock down to a manageable size, the material moves more easily through conveyors, fits into secondary crushers, and becomes suitable for grinding and separation steps later on. If ore were left in its raw form, equipment would clog, throughput would drop, and downstream processes couldn’t operate efficiently. Other options describe tasks that aren’t done by this stage: sorting by color isn’t a crushing task, and would be done by optical or manual methods later; separating diamonds from gangue by density is a gravity or flotation/separation step after crushing; transporting ore to the plant is a logistics activity that happens alongside or after the crushing process, not the core purpose of crushing itself.

The main idea is that primary crushing exists to reduce large, unprocessed ore into a size that can be handled and fed into the next stages of processing. By bringing big rock down to a manageable size, the material moves more easily through conveyors, fits into secondary crushers, and becomes suitable for grinding and separation steps later on. If ore were left in its raw form, equipment would clog, throughput would drop, and downstream processes couldn’t operate efficiently.

Other options describe tasks that aren’t done by this stage: sorting by color isn’t a crushing task, and would be done by optical or manual methods later; separating diamonds from gangue by density is a gravity or flotation/separation step after crushing; transporting ore to the plant is a logistics activity that happens alongside or after the crushing process, not the core purpose of crushing itself.