Coaltech Research Association

Spontaneous Combustion of Coal and Coal-shales

Laboratory testing of samples from South African collieries using two Wits self-heating indices alongside proximate and ultimate analysis, for ventilation and safety engineers assessing burning shale risk.

by M. Onifade & B. Genc | 2018

What this report found

Testing of 28 coal and coal-shale samples showed the coals to be more liable to spontaneous combustion than the shales, though reactive coal-shales still self-heat and pyrite in them speeds the process. Higher carbon, moisture, hydrogen, volatile matter and nitrogen with lower ash all raised proneness to self-heating, so proximate and ultimate analysis can serve as a screening tool.

R1500,00

Description

Related Products

Dry Processing of Coal – Progress Report: Tests Conducted on the IMS / Slater Coal Marketing Allair Dry Jig

GJ de Korte

2016

Test work on a dry jig installed at a Balmoral site, covering coal sized below 50 mm and duff below 12 mm, for producers considering waterless beneficiation.

What this report foundA 30 tonne per hour pilot Allair dry jig upgraded run of mine coal to thermal coal specification, but could not effectively beneficiate finer duff.

R1500,00

R1500,00

GJ de Korte

201613 pages

What this report found

A 30 tonne per hour pilot Allair dry jig upgraded run of mine coal to thermal coal specification, but could not effectively beneficiate finer duff. Cut point densities and EPM values matched other dry processing equipment, though the jig appeared to give better control of the parameters governing separation. Four tests ran on run of mine coal and two on duff.

Geotechnical Factors Associated With Previously Mined Areas of Coal and Their Impact on Subsequent Extraction

Lesley Sharon Jeffrey

2002

Masters research on pillar extraction in the Witbank Coalfield, ranking the ground conditions that decide method choice and safety, for rock engineers and mine planners.

What this report foundGeotechnical factors affecting secondary extraction were identified from interviews with collieries already re-mining pillars and with people experienced in...

R1500,00

R1500,00

Lesley Sharon Jeffrey

What this report found

Geotechnical factors affecting secondary extraction were identified from interviews with collieries already re-mining pillars and with people experienced in stooping, then quantified and ranked against the different aspects of the work. No single factor governs the outcome. Factors interact, so choosing a method and working safely in old workings depends on managing them together across disciplines.

More Effective Use of Disposable Dust masks

Underground field trials, laboratory seal tests and operator questionnaires at two collieries, covering mask selection, fit, issue records and service time. For ventilation and occupational hygiene staff.

What this report foundDust masks worn by load haul dump operators passed 200 mg of filter loading in an average of 1.7 hours, and continuous miner, shuttle car and roofbolt...

R1500,00

R1500,00

What this report found

Dust masks worn by load haul dump operators passed 200 mg of filter loading in an average of 1.7 hours, and continuous miner, shuttle car and roofbolt operators reached the same point within two to five hours. Every mask failed laboratory fit testing. An eight hour service life is too long.

Shopping Basket