Abstract: Related to a blast furnace coke and a production method thereof. A coke having high reactivity and high strength in which coke strength, reactivity with CO2 and a pore size distribution are each at a desired level can be produced at a low cost by using a coal blend composed of a small number of brands comprising a large quantity of caking coal having medium rank and low fluidity. The blast furnace coke, being obtained by charging a coal blend comprising 60 wt % or more of semi-heavy caking coal having medium rank and low fluidity in which a content of inert component is 30 vol % or more in total or another coal blend comprising 60 wt % to 95 wt % of semi-heavy caking coal having medium rank and low fluidity in which mean reflectance (Ro) is 0.9 to 1.1 and maximum fluidity (MF) is less than 3.0 and the balance being a caking coal in which mean reflectance (Ro) exceeds 1.

Abstract: In a method of producing coke for metallurgy by carbonizing a coal blend obtained by blending plural raw coals in an coke oven, a coal blend containing not less than 60 wt % of a medium coking coal of middle coalification degree and low fluidity having an inert component content of not less than 30% is used as a coal charged into the coke oven, whereby a great amount of raw coal of a brand being cheap and easily available can be blended in a great amount and hence coke for metallurgy having an excellent quality such as strength or the like can be produced by blending few brands of coals as compared with a coal blend of many brands.

Abstract: The present invention provides a coating layer of the coke oven having a high strength, high impact resistance and excellent smoothness to enable long term protection of the fire brick of the coke oven. Carbon adhered to the brick can be removed by spraying a coating agent with a glaze layer mainly composed of 18 to 70% by weight of SiO.sub.2 and 10 to 60% by weight of Na.sub.2 O and/or K.sub.2 O and containing one or a plurality of 2 to 14% by weight of P.sub.2 O.sub.5, 0.5 to 25% by weight of BaO, 0.5 to 25% by weight of SrO and 0.5 to 20% by weight of Fe.sub.2 O.sub.3 onto the surface of a high temperature firebrick, thereby obtaining an excellent coating layer.