Experimental study on explosion intensity of dust cloud in lead and zinc concentrate powder

doi:10.16265/j.cnki.issn1003-3033.2025.12.1385

Abstract

Abstract:

In order to prevent dust cloud combustion and explosion accidents in the high sulfur content concentrate warehouse after beneficiation, lead concentrate and zinc concentrate of Panlong Lead Zinc Mine were taken as examples. Tests on explosion intensity and the lower explosion limit at different mass concentrations were conducted using a 20 L balls. Main parameters, including the maximum explosion pressure, explosion lower limit, and explosion index of the lead zinc concentrate powder dust cloud, were obtained. The results show that maximum explosion pressures of lead concentrate and zinc concentrate dust clouds were 0.335 and 0.251 MPa, respectively, both occurring when the mass concentration of the dust cloud was 1 000 g/m³. The lower explosive limits of mass concentration are 160-170 and 210-220 g/m³, respectively, indicating low explosion risk. The explosion risk and hazard of dust clouds in lead concentrate are higher than those in zinc concentrate. The explosion mechanism of concentrate dust cloud particles being ignited, exploded, and subjected to a chain reaction is obtained. These findings provide an experimental and theoretical basis for preventing dust cloud explosion of concentrate in the concentrate warehouse.

Key words: lead concentrate, zinc concentrate, dust cloud, explosion intensity, lower explosive limit

CLC Number:

X932爆炸安全与防火、防爆

DENG Zhenli, QIN Guoju, TANG Yunjian, LI Xiaoquan, WEI Ningying. Experimental study on explosion intensity of dust cloud in lead and zinc concentrate powder[J]. China Safety Science Journal, 2025, 35(12): 64-69.

Figures/Tables 8

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成分	Cu	Pb	Zn	Ti	Ag^*	Fe	Cd	Ni
含量	0.12	57.91	3.55	0.006	206	7.42	0.017	<0.005
成分	Co	Al	Ca	Mg	K	Na	S	C
含量	<0.005	0.13	0.50	0.23	0.065	0.032	19.42	1.09
成分	Mn	P	Sb	As	Hg	SiO₂	—	—
含量	<0.005	0.53	1.26	1.60	0.003	1.40	—	—

成分	Cu	Pb	Zn	Ti	Ag^*	Fe	Cd	Ni
含量	0.034	1.25	51.33	0.008	53.8	5.74	0.21	<0.005
成分	Co	Al	Ca	Mg	K	Na	S	C
含量	<0.005	0.15	0.92	0.47	0.074	0.044	31.65	0.64
成分	Mn	P	Sb	As	Hg	SiO₂	—	—
含量	<0.005	0.14	0.079	0.38	0.03	1.23	—	—

精矿	质量浓度/ (g·m^-3)	最大爆炸压力 P_max/ MPa	最大爆炸压力上升速率 (dP/dt)_max/ (MPa·s^-1)	爆炸指数K_max/ (MPa·m·s^-1)	是否爆炸
锌精矿	60	0.139	—	—	×
	250	0.171	28.941	7.86	√
	500	0.179	30.644	8.32	√
	750	0.21	35.751	9.70	√
	1 000	0.251	37.453	10.17	√
	1 500	0.192	34.900	9.47	√
铅精矿	60	0.130	—	—	×
	250	0.179	28.941	7.86	√
	500	0.238	35.751	9.70	√
	750	0.310	43.412	11.78	√
	1 000	0.335	44.263	12.01	√
	1 500	0.266	34.048	9.24	√

硫精矿	质量浓度/ (g·m^-3)	最大爆炸压力 P_max/ MPa	最大爆炸压力上升速率 (dP/dt)_max/ (MPa·s^-1)	爆炸指数 K_max/ (MPa·m·s^-1)	是否爆炸
锌硫精矿	240	0.177	30.644	8.32	√
	230	0.157	30.644	8.32	√
	220	0.145	—	—	×
	220	0.155	31.495	8.55	√
	210	0.142	—	—	×
	210	0.135	—	—	×
	210	0.146	—	—	×
	200	0.146	—	—	×
铅硫精矿	200	0.177	30.644	8.32	√
	190	0.164	33.197	9.01	√
	180	0.146	—	—	×
	180	0.153	30.644	8.32	√
	170	0.152	32.346	8.78	√
	160	0.131	—	—	×
	160	0.146	—	—	×
	160	0.135	—	—	×