A t(10)-based method for evaluation of ore pre-weakening and energy reduction

作者：Zuo Weiran; Shi Fengnian^*

来源：Minerals Engineering, 2015, 79: 212-219.

DOI：10.1016/j.mineng.2015.06.005

• Pre-weakening characterisation
• Breakage model
• High voltage pulse

Currently the effect of the pre-weakening of ore particles by high voltage pulses is evaluated by the percentage change of A * b values between pulse-treated and untreated ore particles. The values of A * b, widely used as an ore breakage competence indicator in the mineral industry, are determined from the parameters of the JKMRC breakage models. In this study a t(10)-based method was developed to predict the degree of size reduction, t(10), of pulse-treated particles from that of untreated particles broken at the same size/energy level. This method incorporates one parameter, C-Ab, which is equivalent to the percentage change of A * b values.
The t(10)-based method was validated using nine sets of comparative JK Rotary Breakage Tester data on pulse-treated and untreated ore samples over a wide range of impact specific energies and particle sizes. The t(10)-based method can be used to calculate the energy reduction due to the pre-weakening effect in the downstream comminution process. It indicates that the energy reduction by pre-weakening increases with an increase in the target product fineness and the degree of pre-weakening, and with the decrease in feed particle size.

• 出版日期2015-8