Black Petroleum Coke Granules
Overview
Petroleum coke granules are a byproduct of oil refinery coker units, consisting primarily of carbon with minor sulfur and metal impurities. They are produced through the thermal decomposition of heavy petroleum residues during crude oil processing. As a cost-effective carbon source, these granules serve critical roles in metallurgical and industrial applications. Their quality varies based on feedstock and processing conditions, with key distinctions between 'fuel-grade' (higher sulfur) and 'calcined' (purified) coke used in aluminum smelting.
Physical and Chemical Properties
The material typically contains 80-95% carbon, with sulfur content ranging from 1-7% depending on crude oil origin. Its porous structure contributes to a bulk density of about 0.8-1.2 g/cm³, while fixed carbon content often exceeds 85%. Notable characteristics include high calorific value (~8,000 kcal/kg), electrical conductivity, and thermal stability. The granular form (usually 1-100mm particles) facilitates handling and combustion efficiency compared to powdered variants.
Main Applications
In aluminum production, calcined petroleum coke is essential for manufacturing carbon anodes used in electrolytic reduction cells. The granules' high carbon purity ensures efficient electrolysis while minimizing impurities in molten aluminum. Other significant uses include: as a fuel supplement in cement kilns (replacing coal), feedstock for graphite electrode production, and reducing agent in steelmaking. Fuel-grade variants power industrial boilers, though sulfur emissions require scrubbers.
Safety and Storage
As a combustible material, petroleum coke granules require precautions against dust explosions. Storage silos should incorporate explosion vents, and facilities must control static electricity during pneumatic transfer. Long-term storage demands moisture protection to prevent agglomeration. Bulk piles require compaction to minimize spontaneous combustion risks. Workers handling dry material need NIOSH-approved respirators to avoid respiratory irritation from fine particulates.
B2B Procurement Guide
Industrial buyers should specify: 1) Sulfur content (lower grades <3% for environmental compliance), 2) Particle size distribution (critical for anode production), and 3) Ash/metals content (affects product purity). Reliable suppliers provide material safety data sheets (MSDS) and batch analysis certificates. Containerized shipments reduce contamination risks versus bulk transport. Price fluctuations correlate with crude oil markets and environmental regulations affecting refinery outputs.
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