(1) the fixed carbon (C) content should be high, that is, ash and volatile matter should be low.

(2) harmful impurities, such as sulphur and phosphorus, are low.

(3) wear resistance and crushing strength are better.

(4) low responsiveness and high reaction intensity.

(5) water should be low and stable.

(6) the size of coke should be even, the content of 40 ~ 80mm should be high, and the content of <25mm should be low.

To meet the above requirements, blast furnace production can be guaranteed to achieve high yield, high quality, low consumption, but also effectively improve the utilization factor, high smelting strength, low coke ratio, low sulfur, phosphorus quality pig iron.