Abstract: A new type of breakage equipment based on Marx generator was developed in view of the defects of the traditional breakage equipment such as insufficient dissociation and uneven product size distribution. In order to realize high efficiency mineral liberation, preliminary enrichment and pre-weakening, the typical Anshan magnetite quartzite was studied using the new equipment. The equipment is composed of a primary charging power supply, a Marx generator, a gas switch and a new type of needle-plate electrode equivalent. The high-voltage pulse discharge breakage experiment indicated that the optimum parameters of ball gap spacing 25 mm and input voltage 70 V, respectively. The increase in the pulse number was conducive to enhancing the breakage effect. Compared with mechanical crushing, the TFe content in the fine particle size of electrical pulse crushing products was significantly increased. With the pulses number of 300, the content of TFe in -0.074 mm particle crushing product increased by 9.14%. The high-voltage pulse breakage was helpful to the preconcentration of iron in fine particle and the effective liberation of magnetite-quartz intergrowth.

Key words: High-voltage pulse discharge, Marx generator, Magnetite quartzite, Interface dissociation