Analysis of experimental data with fitting a response surface
model was done which the results are presented in Table 5 and
Figs. 5 and 6.
The results in Table 5 and Figs. 5 and 6 reveal that the linear
effects of all of factors and the quadratic effects of solid percentage
and balls charge weight are statistically significant in the mass loss
of balls. It is also observed no interactions between factors. In
addition, It is found that the influence of individual variables and
their quadratic effects on the wear rate of steel balls is in the order
of ball type > solid percentage > pH > solid percentage2 > charge
weight2 > grinding time > rotation speed of mill > charge
weight > throughout. In addition, the regression equation for balls
wear rate (CR) as coded variables is: