### bonds crushing law and work index

Bond Work Index FormulaEquation Basic EquationsSize Distribution and Exposure RatioEquations For Work Index VariationsWork Index and Crack Energy The basic work index equation isW 10 Wi√P – 10 Wi√F1where W is the work input required in kilowatt hours per short ton to grind from 80 passing F microns to 80 passing P microns and Wi is the work index or the grinding resistance