Channel of blast furnace taphole is molten iron of derivative high temperature or slaggy passageway. Those who endure a few kinds of elements want to destroy action to be as follows in producing a course:
(1) high temperature molten iron of flow and slaggy acuteness erode and erode action;
(2) the chemistry of blast furnace slag erodes action;
(3) the acuteness thermal shock of intermittent taphole destroys effect.
Accordingly, line of requirement taphole channel should have undermentioned character:
(1) fireproof material fights taphole channel line high temperature molten iron and slaggy erode reach erode ability is ambitious;
(2) have fight high temperature capability and wear-resisting function admirably;
(3) fight high temperature slaggy chemical aggressivity is ambitious;
(4) heatproof shake sex is close friends, burn change again small;
(5) fight all sorts of oxidation ability ambitious;
(6) easily construction, facilitate demolish repair, do not produce harmful gas, be helpful for protecting an environment.
The material that place of channel of taphole of foreign large blast furnace uses is qualitative, differ by use place can divide:
(1) advocate channel uses corundum - carborundum - carbolic department material is qualitative;
(2) molten iron raises channel to use tall aluminous aluminous grog - carborundum - carbolic department material is qualitative;
(3) slaggy raise channel to use argillaceous grog (or aluminous grog) material of department of carbon of " carborundum " is qualitative.
Line of broken bits of channel of blast furnace taphole reachs the liner of the place such as molten iron line, mar faster also, especially when proportion of broken bits iron is high, more serious. For this, can use hot gush filling method to repair channel line, those who make achieve balanced mar, in order to improve service life.
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