Overview
Bituminous coal, referred to as 'Wu Kuai Mei' in Chinese markets, is a mid-rank coal between sub-bituminous and anthracite. It accounts for nearly 50% of global coal reserves and is prized for its balanced energy output and caking ability. The term 'five-lump coal' originates from its traditional classification by size in Chinese mining. Its versatility makes it a cornerstone for steelmaking (via coke), cement production, and thermal power plants, especially in developing economies.
Physical and Chemical Properties
Bituminous coal exhibits a black, shiny appearance due to its high vitrinite content. Its carbon content ranges 60–80%, with volatile matter at 20–40%, enabling efficient combustion. The coal's density (1.2–1.5 g/cm³) and hardness vary by rank. Notably, it contains 1–3% sulfur, requiring scrubbing in emissions-sensitive applications. Its moisture content (8–18%) and ash yield (5–15%) impact transportation costs and furnace efficiency. The coal's caking index (G-value) determines its suitability for metallurgical coke.
Main Applications
Over 70% of bituminous coal is used for electricity generation, where its 24–35 MJ/kg calorific value ensures stable baseload power. In metallurgy, high-grade bituminous coal is carbonized to produce coke for blast furnaces. Secondary uses include industrial boilers, synthetic natural gas (SNG) production, and as a reductant in ferroalloy smelting. Certain types serve as raw material for activated carbon and carbon fiber manufacturing, leveraging their microporous structure.
Safety and Storage
As a combustible solid, bituminous coal requires strict storage protocols. Piles should not exceed 8m height to prevent spontaneous combustion, with regular temperature monitoring. Dust control systems are mandatory to mitigate explosion risks (minimum explosive concentration: 50 g/m³). Workers must wear NIOSH-approved respirators when handling powdered coal due to silicosis risks. Storage areas need lightning protection and exclusion zones for smoking/open flames. Spills should be contained with non-sparking tools to prevent ignition.
B2B Procurement Guide
Procure bituminous coal based on application-specific parameters: power plants prioritize calorific value (>5,800 kcal/kg) and low ash (<12%), while coking coal buyers seek strong caking properties (G>80). Always request third-party assay certificates for sulfur, volatile matter, and Hardgrove grindability index (HGI). For imports, consider logistics costs—rail transport typically adds $15–30/ton versus barges. Negotiate moisture penalties (typically 1% price reduction per 1% moisture above 10%). Ethical sourcing certifications like Responsible Coal (RC) gain traction among EU buyers.
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