The materials after the primary crushing often need fine crushing. In generally, the main fine crushing equipments are impact crusher and cone crusher in the stone production line. Usually we use impact crusher to crush the soft rock such as limestone, for the impact crusher can raise the production and reduce the broken segment. We generally select cone crusher for crushing the medium hard rock.
We must analyze the raw materials and understand its properties and then select the suitable crushing equipment. In general we use two broken segments to crush three level coarse aggregate; use three broken segments to crush fourth level coarse aggregate.
Impact crusher is new and high-efficiency ore-breaking equipment. It is promising equipment with many advantages, such as small volume, simple structure, big reduction ratio (up to 40), low energy consumption, great productive capacity, good finished product shape and selective ore-breaking. However, its biggest disadvantages are its vulnerable board hammer and impact board. Especially when breaking hard ores, they need to be replaced frequently. Owing to the appearance of some wear-resisting materials at present, this series of impact crusher has been used in some concentrating plants.
Cone crusher is suitable for the crushing of materials in the industries of metallurgy, building, road paving, chemical and silicate. It can crush kinds of ores and rocks with the hardness of medium and above medium. Cone crushers have the advantages of big reduction ratio, high efficiency, low energy consumption, and equal granule. It is used in the medium and fine crush of all kinds of ores and rocks.
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