Dry-process-sprayed coal mine sealants, a progress report

Technical Report · Sat Jan 01 04:00:00 EST 1977

OSTI ID:7219356

Fraley, J E; Cox, D J

In this Bureau of Mines study, sealants containing mineral wool, cement, etc., were sprayed through dry-process equipment that propels dry material pneumatically to the water-adding nozzle. Advantages over slurry applications include no mixing, no extensive cleanup, and freedom from hardened cement in equipment should power be lost. Sealants with large mineral wool modules (>1-inch) were sprayable at rates to 900 square feet per hour for /sup 1///sub 2/-inch thickness with little dust and smooth material flow through equipment, but they were weak for mine use. Materials containing small wool nodules (/sup 1///sub 4/-inch) were stronger but tended to plug lines because the nodules were inadequately separated in the shredder. Increasing the dedusting oil also increased line plugging by holding the nodules together in larger lumps. Best results were obtained using a /sup 3///sub 4/-inch-nodule wool with cement binder, which provided both smooth flow through the machine and adequate strength.

• Research Organization: Bureau of Mines, Spokane, WA (USA). Spokane Mining Research Center
• OSTI ID: 7219356
• Report Number(s): BM-RI-8233
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
BINDERS
BUILDING MATERIALS
CEMENTS
COAL MINES
COAL MINING
DISPERSIONS
FLUID MECHANICS
HYDROGEN COMPOUNDS
MATERIALS
MECHANICS
MINERAL WOOL
MINES
MINING
MIXTURES
NOZZLES
OXYGEN COMPOUNDS
PARTICLE SIZE
PNEUMATICS
SEALING MATERIALS
SIZE
SLURRIES
SUSPENSIONS
UNDERGROUND MINING
WATER