The conditions providing proceeding of the reactions between pyrite sulphur of medium-metamorphized coal and air-steam mixture in the kinetic area have been found. Experimental-statistical mathematical model has been designed. The optimal factors of mediumcoalificated coal oxidative desulphurization have been determined on its basis. Under optimal conditions two samples of coking coal have been desulphurized. These samples will be used as components of the coal charge in the production of special types of coke.

The effect of pyrite size and distribution character, as well as the amount of inorganic matter on the removal degree of sulphur from coal during its oxidative desulphurization and benefication has been studied. The efficiencies of oxidative desulphurization processes for different types of the initial and concentrated black coal have been compared.

Plastometric investigations of the coking basic charge and charge with desulphurized coal of various quality and quantity have been carried out. Non-volatile residues have been investigated using technical analysis and derivatographic investigations. Their mechanical strength, abrasive strength and reactivity have been examined. In spite of some worsening of mediummetamorphized coal capability to turn into plastic state and cake it may be used as a coking raw material additive (5 mas % relative to the finished mixture) during production of special types of coke. The obtained coke properties were found to be constant or even better compared with those of the basic charge or charge with sulphuric or high-sulphuric additives