השוואת שיטות

	מדד עבודת בונד	מודל הגרעין המתכווץ
תחום	הנדסת כרייה	הנדסת כרייה
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1952	1976
הוגה השיטה	Fred C. Bond	Szekely, Evans, and Sohn
סוג	Empirical method for grinding energy estimation	Reaction kinetics model for solid-fluid reactions
מקור מכונן	Bond, F. C. (1952). The third theory of comminution. Transactions of the American Institute of Mining and Metallurgical Engineers, 193, 484-494.	Szekely, J., Evans, J. W., & Sohn, H. Y. (1976). Gas-solid reactions. Academic Press, New York.
כינויים	Bond Work Index, BWI, Bond Index Test	Shrinking Unreacted Core Model, SCM, Leaching Kinetics Model
קשורות	3	3
תקציר	The Bond Work Index, introduced by Fred C. Bond in 1952, is an empirical parameter that characterizes the resistance of an ore to grinding in a tumbling mill. It is defined as the kilowatt-hours per short ton (kWh/st) of electrical energy required to reduce a coarse ore from theoretically infinite size to 80% passing 100 micrometers. The Bond Index is foundational in mineral processing plant design and cost estimation worldwide.	The Shrinking Core Model, formalized by Szekely, Evans, and Sohn in 1976, describes the kinetics of chemical reactions between solid ore particles and surrounding fluids (leaching solutions, roasting gases). As the reaction proceeds from the particle surface inward, an unreacted core shrinks while products accumulate in a product layer. The model enables prediction of leaching times and optimization of hydrometallurgical processes.