Abstract
	Blast furnaces cover major volume of hot metal production. There is a world wide tendency to inject pulverized coal through the blast furnace tuyere. The principal aim of the blast furnace plants has become a maximization of pulverized coal injection rate. Therefore it is very important to find a suitable coal which enable it. Combustion efficiency of the pulverized coal depends on various parameters, e.g. blast temperature, oxygen enrichment of the blast, blast humidity, features of the pulverized coal ( volatile maters contents, combustibility, particle size...). It was find out at high pulverized coal injection rate the incombusted not utilized particles of char and carbon black are conducted away from furnace in waste gases.
	The aim of this work was to obtain knowledge about pulverized coal reactivity, injected in VSZ a.s. Kosice. From some sorts of black coals the samples of the char in nitrogenous atmosphere at temperature 1000°C were prepared. The sample of the brown coal was prepared, too. Subsequently, the samples were pulverized and screened at three size fractions. Reactivity test was carried out in carbon dioxide atmosphere at temperature 1000°C. The reactivity index was expressed as amount of the combusted carbon up to the twentieth minute of the experiment. It is probably possible by this test to predict of the behavior of noncombusted char particles in reduction area of blast furnace. The results show, the char reactivity from black coal has different values and the char reactivity from brown coal is much higher. The new coal mix for blast furnace injection was proposed.