Influence Of Coal Properties On COREX Process And Its Optimization

Charred coal storage has been short for recent years. Meantime, COREX process has been famous with usage of normal coal. It changes energy arrangement in iron-making process. It is the only one of smelting and reduction processes which has been industrialized.Now, COREX is still a potential and developing process. There are two main problems in the process. Coal consumption of COREX is too much and coke is still used to supply effective calorific value of coal and form a fix bed with carbon. So corporations inland are cautious about COREX process.Coal storage in our country is rich. So, a research on coal properties was carried out to find an effective way to decrease energy consumption in COREX process.A simulating reductive shaft was used to find the best reduction cycle. Reductive gas utilization ratio and its theoretic formula were got from experiment. A high temperature compression resistive machine was used to test heat stability of coal. Components of smelting coal and iron ore were got from technical analysis. Effective calorific value of coal,component of reductive gas and smelting heat of ore were calculated from the analysis. From researching on relationships between above all, it was proved that the balance of gas needing and supplying was the key to COREX process optimization. At the balance, metallization ratio could be confirmed.From research, it was proved that smelting coal properties were important to COREX process. Proper effective calorific value of coal could decrease coal consumption. Smelting coal with high heat stability could avoid coke usage. Energy consumption was minimized at the balance of gas needing and supplying.An effective method was found to decrease coal and energy consumption from research. It could be valuable reference for selecting smelting coal in COREX process.