In this study, high-voltage pulse was used for crushing copper ore. The effects of operational parameters on product size, yield and enrichment rate were studied. The influence of operational parameters on the yield of unit energy consumption (delta) for crushing was investigated using orthogonal experiments. The results showed that the variation trend in the content of completely broken product was opposite to that of the average grain size. The rate of enrichment (beta) of chalcopyrite first increased, and then, decreased with the increase in voltage. However, the rate of enrichment decreased with the increase in the number of pulses, and was less affected by the spacing between the electrodes. With the continuous change in operational parameters, for the chalcopyrite gradually stabilized within the range of 1.1-1.2. The high-voltage pulse can effectively enrich chalcopyrite, while the overall variation trend of beta showed a decline with the increase in grain size. However, the value of beta was higher than unity. Furthermore, the value of beta for -0.3 mm broken product was relatively higher, and was about 1.46. Except for the 0.3 mm and 4 mm size fractions, there was no obvious turning point in the beta curve of other size fractions. Additionally, the effect of size fraction on the value of beta was weak. Under the conditions of breaking the mineral, the voltage had the greatest influence on delta value, which increased with the decrease of voltage and number of pulses. At 110 kV and 55 number of pulses, the maximum value of delta was up to 1.66, which gradually declined in the direction of increasing energy consumption. (C) 2018 Published by Elsevier B.V.