Effect of Microwave Pretreatment on Grindability of Lead-Zinc Ore

Table 3

Grinding fineness of lead-zinc ore with different grinding time under different microwave pretreatment conditions.

Pretreatment conditions	Pretreatment time; (s)	Grinding time; (min)	Give ore amount; (kg)	The yields of below 0.074 mm (%)
No microwave irradiation	0	10	0.8	37.80
	0	11	0.8	40.04
	0	12	0.8	42.88
	0	13	0.8	45.31
	0	14	0.8	47.80
	0	15	0.8	50.23
Continuous microwave, power of microwave was 800 W, natural cooling	70	10	0.8	42.03
	70	11	0.8	43.99
	70	12	0.8	46.27
	70	13	0.8	49.84
	70	14	0.8	51.07
Continuous microwave, power of microwave was 7 kW, natural cooling	15	10	0.8	46.55
	15	11	0.8	48.13
	15	12	0.8	49.87
	15	13	0.8	51.34
Pulsed microwave, power of microwave was 7 kW, pulse width was 1 ms, working frequency was 500 Hz, natural cooling	15	10	0.8	49.53
	15	11	0.8	52.38