Study on application of surfactant compound in coal seam water injection for dust reduction

doi:10.16265/j.cnki.issn 1003-3033.2020.10.013

Abstract

Abstract: In order to prevent and control coal dust pollution during mining in fully mechanized working face, with bituminous coal seam in a mine in Heilongjiang as an research object, water injection experiments in coal seam for dust reduction were carried out. Firstly, four surfactants were selected, namely sodium secondary alkyl sulfonate (H95), dodecyl dimethyl benzyl ammonium chloride (1227), coconut oil amide propyl betaine (CAB-35), coconut oleate diethanolamide (CDEA). Then, they were mixed in pairs according to their CMC to obtain six solutions. Finally, surface tension, contact angle and reverse osmosis of monomer and compound solution were tested respectively. The results show that compound solution of 0.05% H95 and 0.05% CDEA has the best wettability to coal. After adding compound surfactant, removal rates of total dust were 83.96%, 76.17% and 72% respectively at coal cutting place, hydraulic support shifting place and belt conveyor transferring place after water injection, and that of respirable dust were 79.29%, 73.95% and 70.3% separately.

Key words: coal seam water injection, surfactant, combination solution, critical micelle concentration (CMC), contact angle, surface tension, wettability

CLC Number:

X936

WENG Anqi, YUAN Shujie, WANG Xiaonan, MA Ruifeng. Study on application of surfactant compound in coal seam water injection for dust reduction[J]. China Safety Science Journal, 2020, 30(10): 90-95.

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