Overview
Lump coke is a critical industrial carbon material produced through the destructive distillation of bituminous coal in coke ovens. As a purified form of carbon with minimal impurities, it serves as both a fuel and chemical reductant in high-temperature processes. Unlike powdered coke, lump coke's physical form (typically 25-100mm pieces) ensures optimal permeability in blast furnaces. The global market is driven by steel production, with China accounting for over 60% of consumption. Quality grades are determined by fixed carbon content (≥85% for metallurgical use).
Physical and Chemical Properties
Lump coke exhibits a characteristic porous microstructure from volatile matter release during coking. Its high carbon content (85-93%) provides a calorific value of ~30 MJ/kg, while ash content below 12% minimizes slag formation in furnaces. Key metrics include the Coke Strength After Reaction (CSR) and Coke Reactivity Index (CRI), which predict performance in blast furnaces. The material's thermal conductivity (1.5-2.5 W/m·K) and low electrical resistance make it useful in electrode manufacturing. Unlike coal, its negligible volatile matter (<1%) ensures clean combustion.
Main Applications
The steel industry consumes ~90% of lump coke, where it fuels blast furnaces while reducing iron ore to pig iron. Its three roles - thermal energy source, chemical reductant, and permeable support - are irreplaceable in modern steelmaking. Foundries use lump coke in cupola furnaces for cast iron production due to its consistent BTU output. Chemical processors employ it to manufacture calcium carbide (CaC2) and synthetic graphite. Emerging applications include water filtration (as activated coke) and aluminum smelting anode production.
Safety and Storage
As a combustible material, lump coke requires dry storage away from oxidizers. Moisture absorption (>5%) significantly reduces heating value and may cause spontaneous heating in bulk piles. Dust control measures are essential to prevent explosive atmospheres. Workers should use NIOSH-approved respirators (N95) when handling to avoid pneumoconiosis risk. Storage piles must not exceed 4m height to prevent self-ignition. Firefighting requires dry chemical agents – water application can produce dangerous steam explosions in hot coke.
B2B Procurement Guide
Industrial buyers should specify these parameters: Fixed carbon (min 85%), ash content (max 12%), sulfur (max 0.8%), and size distribution (80% within 25-80mm range). CSR above 60% indicates blast furnace-grade quality. Bulk shipments typically use railcars or bulk vessels (25,000-80,000 ton lots). For smaller orders, 1-ton big bags are common. Always request certified lab analysis reports with each shipment. Consider regional suppliers to minimize logistics costs, as coke is bulky relative to its value.
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