crushing productivity influence factors
common used crushers
The most common used crushing equipment are as follow: jaw crusher, hammer crusher, impact crusher, European jaw crusher, cone crusher: spring cone crusher, CS series cone crusher, hydraulic cone crusher, hcs90 cone crusher, mobile crusher etc. when use these crusher, it is important for us to know what are the factors that influence the productivity of them.
In summary, the key factors that influence productivity are ore properties,working condition and crusher work parameters .
Influence of ore properties
Since different ores have different hardness, density, metallic character and ore texture, the crushing productivity will be different relatively.
When crushing ores that with good hardness, the productivity of crusher is reduced. That is because the ore of good hardness is hard to be crushed. Ores with large density can make the production capacity larger and the density coefficient can represent the density effect on crushing. Furthermore, ores that have loosen texture and well-developed cleftiness are easy to be crushed. The ores with high water content and silt content will easily cement and block the crushing chamber so when the ores are too wet, the productivity capacity will be decreased.
The influence of crusher specification
When talk about various kind of crusher, there are many factors that influence productivity capacity, such as crusher’s types and specifications, ore discharging mouth size, rotational speed and schedule and nip angle have influence on crushing.
When doing the same crushing work, using different types of crushers will get different production capacity. In the condition that there are same feedings and the same product particle size, gyratory crusher productivity is 2-3 times of the Jaw Crusher productivity. Among the similar Jaw Crushers, the single toggle Jaw Crusher has the productivity that is 20%-30% higher than double toggle Jaw Crusher productivity. Even if there are equipments with the same type, if the specification and size are increased, the productivity will be also increased. High rotate speed will lead the productivity decreasing and the crusher will be blocked, especially the medium or fine Cone Crusher. High rotate speed also will make the materials jump by centrifugal force so that the crushing chamber will be blocked. For these reasons, increasing rotate speed is not used for increasing the productivity. Crusher with high specification, its stroke adjustment of jaw moving or cone moving is also large.
The size of crusher discharge opening decides the nip angle of the crusher. The nip angle of Jaw Crusher, is to say the inclined angle between moving jaw plate and stationary jaw plate when vising the ores. During the crushing process, the nip angle should guarantee the ores in crushing chamber will not jump out. So there must be enough friction between ores and jaw plate, which can prevent the ores will be squeezed out.
The influence of working conditions
When processing hard and brittle ores, we should use small stroke and processing soft and sticky ores should use large stroke. Large discharge opening will have large productivity but the reduction ratio will be reduced and the crushing action will also be reduced. In the discharge opening is too large, much of the materials will be discharged without being crushed. When the discharge opening is small, the reduction ratio is higher but the productivity is too low. So when the crusher is working, both reduction ratio and productivity should be considered and it is better not to pursue a one-sided only.
These are the main factors that influence crushing productivity. In addition, there are some other factors that have influence of productivity capacity. You can consider it according to your actual condition. When operating crushing equipment, pay attention to these things will help you 
to improve working efficiency.
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refer: http://www.crushingprocess.com/crushing-equipment/crusher-productivity-influence-factors/
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