Metallurgical coke

When evaluating metallurgical coke, the most critical parameters are Fixed Carbon content (typically >86%), Ash content (<12-13%), and Sulfur content (<0.6-0.8%). High-quality coke must also have high CSR (Coke Strength after Reaction) and low CRI (Coke Reactivity Index) to ensure it can support the burden in a blast furnace without crumbling. Always request a proximate analysis report to verify these chemical and physical properties.

The size fraction, or granulometry, is vital for maintaining permeability in the furnace. Standard sizes usually range from 30mm to 80mm. If the coke is too small (breeze), it restricts gas flow; if it is too large, it may not react efficiently. Ensure the supplier provides a sieve analysis and specifies the percentage of 'undersize' material allowed at the point of loading.

Suppliers should ideally hold ISO 9001 certification for quality management. For international trade, compliance with ASTM (American Society for Testing and Materials) or ISO standards for solid mineral fuels is essential. It is highly recommended to mandate a third-party inspection (such as SGS or CCIC) at the port of loading to certify that the moisture, ash, and sulfur levels meet the contract specifications before final payment.

The primary application is as a reducing agent and fuel in blast furnaces for steel production. It also serves as a structural support for the iron ore burden. Beyond steel, it is used in foundries for melting iron and in the production of ferroalloys and lead/zinc smelting. Each scenario requires different grades, such as Foundry Coke which typically has larger lump sizes and lower sulfur than standard blast furnace coke.

Metallurgical coke is prone to moisture absorption and mechanical breakage (fines generation) during handling. To mitigate this, specify a maximum moisture limit (usually <5%) in the contract and use Incoterms like FOB or CFR where the quality is determined by a third-party surveyor at the loading port. Ensure the shipping vessel is clean and dry to prevent contamination from previous cargoes.

Coke prices are highly volatile and tied to coking coal indices. For large volumes, consider formula-based pricing linked to international benchmarks. For transaction security, use a Letter of Credit (L/C) or Trade Assurance services via Made-in-China.com. Avoid 100% advance payments; instead, use a structure like 30% deposit and 70% against the Bill of Lading and Inspection Certificate.

Metallurgical coke is a bulk commodity usually shipped in Handysize or Supramax vessels. Buyers must account for demurrage and despatch terms in the charter party. Ensure the supplier has a stable logistics chain from the coking plant to the port. For smaller industrial buyers, containerized shipping in big bags can reduce handling loss, though it increases the unit freight cost.

Many countries impose export quotas or environmental taxes on coke production due to its high carbon footprint. Verify if the supplier has the necessary export licenses and complies with local environmental laws. Be aware of Anti-Dumping Duties (ADD) that certain regions (like the EU or USA) may impose on coke originating from specific countries to avoid unexpected customs costs.