Foundry coke is a critical material in the metal casting industry, providing the necessary heat source and chemical reduction environment for the melting process. Unlike metallurgical coke, foundry coke requires higher post-reaction strength (CSR > 60%), lower reactivity (CRI < 30%), and more stable combustion characteristics. High-quality foundry coke typically features an ash content below 10–12%, sulfur content under 0.7%, and volatile matter around 1.5%, ensuring a stable melting temperature and high-purity molten iron.
Modern foundry coke production primarily utilizes high-quality low-volatile coals (such as coking coal and fat coal) in precise proportions and optimizes the coke structure through specialized coking processes, including dry quenching (CDQ). Galvenie fizikālie rādītāji ietver: triecienizturība (M40) > 85%, nodilumizturība (M10) < 8%, un porainība kontrolēta no 35 līdz 45%. Šie parametri tieši ietekmē kupola krāsns caurlaidību, kausēšanas efektivitāti un kausētā dzelzs kvalitāti.
The International Foundry Association (IFA) classifies foundry coke into three grades: premium grade for high-end precision casting, Grade 1 for automotive parts casting, and Grade 2 for general casting production. Atbilstošas kvalitātes izvēle var palielināt kausēšanas efektivitāti par 15–20% un samazināt kopējo enerģijas patēriņu par 8–12%. With growing environmental regulations, the demand for low-emission foundry coke (low sulfur and low nitrogen) is rising rapidly, exhibiting an annual growth rate of 18%.
