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Dry-process-sprayed Coal Mine Sealants - a Progress Report.

Authors
Fraley-JE; Cox-DJ
Source
NTIS#: PB 271 216 :22 pages
Link
NIOSHTIC No.
10000090
Abstract
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 nodules (>1-inch) were sprayable at rates to 900 square feet per hour for 1/2-inch thickness with little dust and smooth material flow through equipment, but they were weak for mine use. Materials containing small wool nodules (1/4-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 3/4-inch-nodule wool with cement binder, which provided both smooth flow through the machine and adequate strength.
Publication Date
19770101
Document Type
IH; Report of Investigations
Fiscal Year
1977
NTIS Accession No.
PB-271216
NTIS Price
A03
Identifying No.
RI-8233
NIOSH Division
SRC;
Source Name
NTIS#: PB 271 216
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