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Mining Environmental Target Surveillance Investigation: Kyanite 'Sillimanite' Group Minerals.

PB84240217

Publication Date	1981
Personal Author	Cocalis, J.
Page Count	22
Abstract	Potential health hazards of miner exposures to kyanite (1302767) dust were investigated. Potential toxicity of four minerals in the kyanite group was estimated on the basis of physical appearance and free silica (14808607) content. The four minerals of the group were andalusite (12183801), sillimanite (12141456), mullite (1302938) and kyanite. Bulk samples and breathing zone air samples were taken and analyzed by light microscopy and transmission electron microscopy. Quartz (14808607) was commonly found around kyanite deposits and cristobalite (14464461) was formed when the minerals were calcined. Free silica in respirable dust samples reached as high as 48 percent. Andalusite, kyanite, and sillimanite decomposed at about 1550 degrees-C to form mullite and cristobalite. Cristobalite was present in the minerals produced in two facilities. Breathing zone air samples of free silica exceeded NIOSH recommended standards in 8 of 17 samples, with respiratory protection worn by five of the eight workers. The author concludes that potential exposure to dusts containing free silica exists for about 175 kyanite ore miners.
Keywords	Environmental surveys Industrial medicine Mines(Excavations) Dust control Exposure Toxicity Inspection Hazardous materials Silicon dioxide Quartz Toxic substances Occupational safety and health Kyanite Andalusite Sillimanite Mullite Cristobalite CAS 14808-60-7 CAS 1302-76-7 CAS 14464-46-1 CAS 12183-80-1 CAS 12141-45-6 CAS 1302-93-8
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 57Y - Toxicology 68G - Environmental Health & Safety 48A - Mineral Industries 68A - Air Pollution & Control
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	198426

Mining Environmental Target Surveillance Investigation: Kyanite 'Sillimanite' Group Minerals.

Mining Environmental Target Surveillance Investigation: Kyanite 'Sillimanite' Group Minerals.
PB84240217

Publication Date	1981
Personal Author	Cocalis, J.
Page Count	22
Abstract	Potential health hazards of miner exposures to kyanite (1302767) dust were investigated. Potential toxicity of four minerals in the kyanite group was estimated on the basis of physical appearance and free silica (14808607) content. The four minerals of the group were andalusite (12183801), sillimanite (12141456), mullite (1302938) and kyanite. Bulk samples and breathing zone air samples were taken and analyzed by light microscopy and transmission electron microscopy. Quartz (14808607) was commonly found around kyanite deposits and cristobalite (14464461) was formed when the minerals were calcined. Free silica in respirable dust samples reached as high as 48 percent. Andalusite, kyanite, and sillimanite decomposed at about 1550 degrees-C to form mullite and cristobalite. Cristobalite was present in the minerals produced in two facilities. Breathing zone air samples of free silica exceeded NIOSH recommended standards in 8 of 17 samples, with respiratory protection worn by five of the eight workers. The author concludes that potential exposure to dusts containing free silica exists for about 175 kyanite ore miners.
Keywords	Environmental surveys Industrial medicine Mines(Excavations) Dust control Exposure Toxicity Inspection Hazardous materials Silicon dioxide Quartz Toxic substances Occupational safety and health Kyanite Andalusite Sillimanite Mullite Cristobalite CAS 14808-60-7 CAS 1302-76-7 CAS 14464-46-1 CAS 12183-80-1 CAS 12141-45-6 CAS 1302-93-8
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 57Y - Toxicology 68G - Environmental Health & Safety 48A - Mineral Industries 68A - Air Pollution & Control
Corporate Authors	National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type	Technical Report
NTIS Issue Number	198426