Overview
Water-washed anthracite is a premium grade of anthracite coal processed through hydraulic cleaning to remove impurities. This treatment reduces ash content to below 8% and sulfur to under 1%, making it superior to raw anthracite for industrial applications. The washing process involves size classification and density separation to ensure consistent quality. As the hardest and most carbon-rich coal variety, anthracite naturally exhibits high calorific value and chemical stability. The additional water washing enhances these properties by eliminating surface contaminants, resulting in a material with 92-98% fixed carbon content. Its environmental advantages over unprocessed coal have driven adoption in eco-sensitive industries.
Physical and Chemical Properties
Water-washed anthracite displays exceptional physical durability with a Mohs hardness of 2.5-3.5, resisting breakdown during filtration or combustion. Its granular form typically ranges from 0.8mm to 3.5mm for filtration uses, while metallurgical grades may reach 50mm. The material's porosity (35-45%) contributes to its effectiveness as an adsorption medium. Chemically, the washing process reduces acid-soluble components, yielding a neutral pH (6.5-7.5) that prevents water treatment system corrosion. Its high ignition temperature (≈600°C) and slow burn rate make it safer to handle than bituminous coals. The electrical resistivity exceeds 10^8 ohm-cm, qualifying it for certain electronic applications.
Main Applications
In water treatment, washed anthracite serves as the top layer in multi-media filters, removing suspended solids down to 10-20 microns while maintaining high flow rates. Its hydraulic conductivity (≈10 m/day) outperforms sand filters by 3-5 times. The coal's adsorption capacity also aids in removing heavy metals like lead and cadmium. Metallurgical applications include use as a carbon raiser in steel production, where its low phosphorus content (<0.05%) prevents steel embrittlement. Chemical plants utilize it as feedstock for activated carbon production and as a reducing agent in ferroalloy manufacturing. Emerging uses include soil remediation and flue gas desulfurization systems.
Safety and Storage
While water-washed anthracite presents lower spontaneous combustion risk than lower-rank coals (self-ignition temperature >400°C), proper storage in <3m high piles with 5m separation between stacks is recommended. Indoor storage requires explosion-proof electrical fixtures due to potential dust accumulation. Personal protective equipment should include NIOSH-approved dust respirators (for particles <10μm) and safety goggles during handling. The material's abrasiveness necessitates wear-resistant conveyor systems. Fire suppression systems should utilize Class D extinguishers for metal fires, as water application on hot anthracite may produce explosive steam.
B2B Procurement Guide
Industrial buyers should specify these key parameters: Effective size (0.8-1.2mm for filtration), uniformity coefficient (<1.7), acid solubility (<2%), and attrition loss (<3%). Certified test reports for heavy metal content (As, Hg, Pb) are essential for water treatment applications. Bulk shipments typically use 1-ton super sacks or hopper cars with moisture-proof lining. For international procurement, inquire about pre-shipment washing to prevent dust explosion risks during transit. Sample testing should verify the material meets AWWA B100 or ISO 9001 standards. Annual contracts with quarterly price adjustments are common in this volatile market.
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