عنوان

Fracture toughness based models for the prediction of power consumption, product size, and capacity of jaw crushers

Standard Number

electronic

Title Proper

Fracture toughness based models for the prediction of power consumption, product size, and capacity of jaw crushers

Place of Publication, Distribution, etc.

]Blacksburg, Va.[

Name of Publisher, Distributor, etc.

]University Libraries, Virginia Polytechnic Institute and State University[

Date of Publication, Distribution, etc.

]2003[

Text of Note

James George Donovan

Text of Note

There is little process control employed at aggregate crushing plants and essentially no optimization at the primary or jaw crushing stage. Jaw crusher selection is very dependent on the subjective judgment/experience of individuals, the characterization of rock material using inadequate and unrepresentative tests, and the desire to limit secondary breakage, resulting in the conservative selection and operation of jaw crushers. A method for predicting the power consumption, product size, and volumetric capacity of jaw crushers based on fracture toughness has been proposed in this study. A new fracture toughness test, the Edge Notched Disk Wedge Splitting test, has been developed and verified in order to rapidly assess the fracture toughness of six quarry rocks. A High Energy Crushing Test system has been used to simulate the operational settings of a jaw crusher so that comparison of fracture toughness, specific comminution energy, and breakage distribution could be performed. The results indicate that the specific comminution energy required to reduce a rock particle to a given size increases with fracture toughness. The breakage distribution has also been shown to be dependent upon fracture toughness as long as the elastic modulus is taken into account. Laboratory jaw crushing experiments show that the capacity of a jaw crusher is dependent upon fracture toughness and the elastic modulus

Entry Element

، rock fragmentation -- crushing energy

Class number

Relator Code

AU

NO