Surface chemistry modification of rock dust for improved dispersion and coal dust explosion prevention

Qingqing Huang, R. Honaker, K. Perry, B. Lusk

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Rock dust is applied in underground coal mines to prevent the propagation of coal dust explosions. The application is conducted either dry or wet. Both methods have advantages and disadvantages however the formation of caked rock dust particles is cited as a significant concern for wet applications. A study was conducted to evaluate the effect of modifying the rock dust particle surfaces to repel water and each other by the addition of oleic acid (OA) and sodium oleate (NaOL). At a NaOL dosage of 2 Ibs/ton, a contact angle of 112° was measured indicating strong surface hydrophobicity and ability to repel water. FTIR studies indicated a chemisorption mechanism which is necessary for long term stability of the surface modification. The dispersion rate of the modified rock dust samples was elevated by the application of both OA and NaOL thereby indicating a significant reduction or elimination of the detrimental effect of caking. Tests in an explosion chamber showed a 79% reduction in the dust explosion potential relative to untreated rock test applied by the wet technique.

Original languageEnglish
Title of host publication2015 SME Annual Conference and Expo and CMA 117th National Western Mining Conference - Mining
Subtitle of host publicationNavigating the Global Waters
Pages245-251
Number of pages7
ISBN (Electronic)9781510801240
StatePublished - 2015
Event2015 SME Annual Conference and Expo and CMA 117th National Western Mining Conference - Mining: Navigating the Global Waters - Denver, United States
Duration: Feb 15 2015Feb 18 2015

Publication series

Name2015 SME Annual Conference and Expo and CMA 117th National Western Mining Conference - Mining: Navigating the Global Waters

Conference

Conference2015 SME Annual Conference and Expo and CMA 117th National Western Mining Conference - Mining: Navigating the Global Waters
Country/TerritoryUnited States
CityDenver
Period2/15/152/18/15

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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