Magnesium oxysulfate cement sealant in coal mines. Report of investigations, 1976

Technical Report · Tue Jun 01 04:00:00 EDT 1976

OSTI ID:7119846

Fraley, J E; Simpson, R E

Magnesium oxysulfate cement has been specially formulated as a sealant in underground coal mines for reducing slouging of shale roofs and coal ribs, for reducing air losses through block stoppings, for constructing sprayed stoppings over approved jute cloth or metal lath, and for reducing combustibility of polyurethane foam. A standard spray maching (Mining and Enforcement and Safety Administration (MESA) approved) was used for underground testing. Research shows that a half-inch coating reduces shale and coal sloughing, reduces air losses through block stoppings, and prevents fire propagation through a metal tunnel lined with polyurethane foam. During the underground tests, excess mixing water was used to improve pumping the slurry to the spray nozzle. This was later found to increase shrinkage cracks in the cured coatings. Controlling excess water is important to an acceptable coating. (GRA)

• Research Organization: Bureau of Mines, Spokane, WA (USA). Spokane Mining Research Center
• OSTI ID: 7119846
• Report Number(s): PB-255613; BM-RI-8150
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CEMENTS
CHALCOGENIDES
COAL MINES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNESIUM SULFATES
MATERIALS
MINES
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
SEALING MATERIALS
SULFATES
SULFUR COMPOUNDS
TESTING