Dust liberation in the production of refractory compounds for blast furnaces

Abstract

In blast furnace production special refractory compounds are used for sealing of the tap holes and protection of the runners from molten metal and slag,In modern blast furnace d~partments special areas have been developed for the production of these compounds, To evaluate the contamination of the air space in the p~oduction of refractory compounds for the blast furnaces the quantity and composition of harmful substances in two metallurgical combines (I and II) were determined. Table 1 gives the compositions of the prepared compounds, A total of nine compounds were prepared, all of them contained coke and clay, and seven also contained high-temperature pitch.The components other than coke are supplied to the refractory compound area ready for use while the coke was first ground in roll crushers, For the wet compounds moist coke is used and for the dry ones dry.The components are added by the volume method and mixed in mills with water or in heated mixers with pitch.The weight of the powder components is primarily 900-1000 kg and for the tap hole mixture with water in combine I 600-620 kg, The plan of preparation of the compounds is shown in FSg. i.The difference in aggregate forming of the production plan in the combines is that in combine I the dry components are mixed in the mills 7 and the prepared mixture is loaded into the mixture 8. In combine II the components are delivered directly to the mixer 6.The main quantity of the refractory compounds prepared in combine I is normal runner and dry tap hole and in combine II runner and dry tap hole i~ *Deceased.