This standard outlines detailed guidelines for mitigating asbestos emissions specifically during the milling of asbestos ore. It covers dust generation points, equipment enclosures, filtration systems, and waste handling measures to reduce airborne asbestos fibers, ensuring safety for workers and the environment.
Overview
This standard outlines detailed guidelines for mitigating asbestos emissions specifically during the milling of asbestos ore. It covers dust generation points, equipment enclosures, filtration systems, and waste handling measures to reduce airborne asbestos fibers, ensuring safety for workers and the environment.
Audience
Contents
Structure
This section defines the boundaries of the standard focusing on health, safety, and handling measures related to asbestos milling. It references other Indian Standards covering airborne fibre measurement, occupational safety, cleaning, waste disposal, and packaging to provide a holistic framework for asbestos emission control.
Terminology is aligned with related standards which define asbestos fibre types, exposure limits, measurement methodologies, and safety practices. Users are advised to consult referenced IS codes for precise definitions relevant to asbestos handling and exposure.
The main aims include standardizing testing procedures and ensuring occupational safety in asbestos milling by harmonizing with international and local practices, rather than prescribing specific formulas or tables.
This part identifies key dust generation points such as material loading, crushing, screening, and transfer operations. It explains how dust becomes airborne mainly at transfer locations and outlines three main dust control strategies: prevention, dry dust collection via enclosure and extraction, and wet dust suppression.
Details the design elements including exhaust hoods, ductwork, air cleaners (notably bag filters with high efficiency), and fans. Emphasizes enclosure of dust sources, selection of appropriate filter cloth based on air-to-cloth ratios, and maintenance practices to prevent leaks and maintain system efficiency.
Focuses on leak detection using specialized lighting and fluorescent markers, prompt repairs, maintaining vacuum conditions in ducts, and full enclosure of screw conveyors and transfer points. It also highlights the importance of dust exhaust connections with settling boxes to reduce material loss.
Summarizes control measures including airborne fibre concentration monitoring, engineering controls like local exhaust ventilation, use of PPE, wet working methods, restricted access, safe waste handling, and cleaning procedures based on referenced IS standards.
Describes sources of dust and outlines control measures including minimizing material impact, dust collection via enclosures, and wet dust suppression. Specifies exhaust hood and duct design, enclosure requirements, use of green barriers, and other mechanical dust control equipment.
Recommends wet cleaning methods to minimize dust, proper use of PPE, and adherence to disposal practices specified in related standards to prevent environmental contamination. Prohibits dry sweeping and compressed air cleaning.
Refers to standards for airtight, sealed packaging with clear hazard labeling, transportation in covered vehicles, and storage in dry, ventilated, restricted-access areas to prevent fiber release and ensure safety.
Details requirements for wetting tailings to reduce dust, use of screw conveyors for transport, filtration of dust-laden air, and establishment of green barriers to limit airborne fibre dispersion. Disposal must comply with environmental and safety norms per referenced standards.
Highlights occupational exposure limits, air monitoring methods, PPE requirements, hygiene practices, training, and medical surveillance to safeguard workers, referencing relevant IS codes for comprehensive safety protocols.
Frequently Asked
Recommended crushers include enclosed types such as gyrocentric, jaw, cone crushers, impactors, hammer mills, fibrezers, ball mills, edge runner mills, and pulverizers, all fitted with dust control features like hoods and enclosures. Screening should use gyrocentric or vibrating screens equipped with flexible dust connections and aspirator exhaust ducts. Dust control requires proper suction hoods at feeding points and fully enclosed conveyors with flexible skirts and internal dust shields, maintaining continuous material flow to minimize dust generation.
Conveyors, especially screw conveyors, must be fully enclosed to prevent fibre leakage. All transfer points should be sealed and connected to dust extraction systems. Feeding points require appropriate suction hoods. Enclosures should incorporate flexible skirts, internal dust shields, inspection doors, and airtight joints. Systems must be maintained under vacuum to allow only inward leakage, with regular leak detection using fluorescent patches and prompt repair. Proper filter cloth selection based on air-to-cloth ratio is crucial for effective dust collection.
Filtration methods include high-efficiency bag filters capable of capturing particles down to 0.4 microns. Cyclone separators remove coarse dust, with discharge directed to water precipitator tanks for additional capture. The system is maintained under negative pressure to prevent leaks, with leak detection and repair protocols in place. A green barrier of trees complements mechanical filtration, providing an additional dust control layer.
Disposal involves packaging asbestos waste in leak-proof, labeled, sealed containers such as double-layered polythene bags to prevent fibre escape. Transport should be in covered vehicles to avoid dust dispersion, followed by storage in isolated, clearly marked areas. Disposal must occur at approved hazardous waste landfills. During handling, workers should use appropriate PPE, and cleaning should rely on wet methods to limit airborne dust. These practices align with Indian hazardous waste regulations and CPCB guidelines.
Green barriers consisting of at least three rows of fast-growing, dense canopy trees, extending a minimum of 10 meters around the milling area, act as physical filters trapping dust particles and reducing wind velocity. This vegetative buffer decreases dust dispersion and improves local air quality, complementing mechanical dust control systems to create a comprehensive dust mitigation strategy.
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