Wettability of dust from blast piles in Ha'erwusu open-pit coal mine and its influencing factors

doi:10.16265/j.cnki.issn1003-3033.2023.S2.0032

Abstract

Abstract:

In order to enhance the dust suppression effectiveness of dust suppressants, the wettability of dust from blast piles in open-pit mines and their influencing factors were investigated. The coal dust and rock dust generated from different blasting stages at the Ha'erwusu open-pit coal mine were taken as research objects. Various methods, including indoor experiments and statistical data analysis, were employed to analyze the physicochemical characteristics of explosive dust particles from open-pit coal mines. Based on this analysis, the relationship between physicochemical characteristics and wettability was discussed. Regression analysis using SPSS software was conducted to establish a regression model. The final regression equation revealed the primary factors influencing the wettability of dust from blast piles in open-pit coal mines. The results indicate that the significant factors influencing the wettability of coal dust are fixed carbon content and D₅₀. The significant factor affecting the wettability of rock dust is D₅₀.

Key words: open-pit coal mine, dust from blast piles, wettability of dust, influencing factors, dust control

CLC Number:

X964工业防尘

LI Quansheng, YAN Jie, WANG Bin, ZHANG Yu. Wettability of dust from blast piles in Ha'erwusu open-pit coal mine and its influencing factors[J]. China Safety Science Journal, 2023, 33(S2): 7-12.

Figures/Tables 8

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倍数	1号煤尘/4号岩尘	2号煤尘/5号岩尘	3号煤尘/6号岩尘
25 000倍煤尘
25 000倍岩尘

煤质	煤尘	M_ad	A_ad	V_ad	FC_ad
褐煤	1号	5.95	18.27	32.60	43.18
	2号	5.45	17.12	30.70	46.73
	3号	5.18	16.86	27.74	50.22

成分	占比
	煤尘			岩尘
	1号	2号	3号	4号	5号	6号
SiO₂	14.8	—	—	67.3	55.2	51.1
Al₂(Si₂O₅)(OH)₄	65.8	78.9	80.5	32.5	44.1	48.1
AlO(OH)	8.1	12.3	12.1	—	—	—
Ca(CO₃)	11.3	8.8	7.4	—	—	—
Hg₂(H₂PO₄)₂	—	—	—	—	0.7	0.8
其他	—	—	—	0.2	—	—

粉尘理化特征	皮尔逊相关系数
粉尘理化特征	煤尘接触角/(°)	岩尘接触角/(°)
D₅₀/um	-0.937 08	-0.982 54
比表面积/(m²·g^-1)	-0.913 68	-0.963 36
M_ad/%	-0.948 9	—
A_ad/%	-0.914 73	—
V_ad/%	-0.985 71	—
FC_ad/%	0.989 6	—
高岭石/%	0.960 49	0.960 49
石英/%	-0.972 95	-0.972 95
方解石/%	-0.523 21	—
勃姆石/%	0.474 69	—

模型参数	T检验
模型参数	T值	显著性
常量	2.503	0.046
固定碳含量	11.321	<0.01
D₅₀	-2.503	0.046