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 method and apparatus for accurately diagnosing a state of damage on a wall of a coking chamber of a coke battery. The method includes accurately diagnosing the damage state of the chamber wall by combination of three detection means. The three detection means include means for photographing the wall of the coking chamber of the coke battery, means for detecting the chamber width between chamber walls by laser range finders, and means for detecting the chamber temperature by radiation thermometers. The joints and the brick surfaces of the coke battery is photographed by a CCD camera. The image of the chamber wall is separated into images of the joints and the brick surfaces. The states of the joints and the brick surfaces are separately recognized to accurately detect damage of the joints and damage of the brick surfaces.