Method for avoiding metal taphole of blast furnace from burning through

Abstract

The invention discloses a method for avoiding a metal taphole of a blast furnace from burning through. The method comprises the following steps: drilling a blind hole in the metal taphole by using a drill bit of a tapping machine; thoroughly purging the blind hole by utilizing high-pressure compressed air; uniformly mixing a corundum casting material and a nano sol binder to obtain a first castingmaterial capable of flowing and a second casting material capable of being molded; under the condition that a clay sleeve of the metal taphole is complete and clean, filling the blind hole with the first casting material; thoroughly eliminating the stemming in a gun head of a hydraulic clay gun, and filling the gun head with the second casting material; tightly pressing the gun head of the hydraulic clay gun on the clay sleeve of the metal taphole by adopting the operation of plugging the metal taphole, pressing the second casting material in the gun head into the blind hole by utilizing thethrust force of the hydraulic clay gun, suppressing the clay tapping pressure of the hydraulic clay gun to the upper limit of the plugging operation pressure, and keeping the pressure; and removing the hydraulic clay gun, and baking the clay sleeve region of the metal taphole by adopting naked flame. The processing steps can be performed during operation of the blast furnace without affecting normal production; and the involved equipment is less, and the processing steps are simple.

Description

technical field [0001] The invention relates to the field of blast furnace smelting, and more specifically relates to a method for avoiding burn-through of a blast furnace iron hole. Background technique [0002] The tap hole is an important part of the blast furnace body. During the production process, the operator needs to use a tapping machine to drill the tap hole on time to allow molten iron and slag to flow out to complete the blast furnace smelting process. During the construction of the blast furnace, the iron gate is poured with castables or built with refractory bricks. However, in the actual production process, due to the turbulent erosion of high-temperature slag iron, thermal shock, chemical erosion of slag iron, etc., it is easy to cause cracks in the refractory materials, brick lining, and iron hole channels in the tap area. Gas leaking from the taphole, sputtering from the taphole, gas channeling from the taphole, etc. will be caused. In severe cases, the sl...

AI Technical Summary

Problems solved by technology

However, the above methods all have different degrees of defects: the first two methods need to be carried out when the blast furnace is shut down, which affects the production progress; The head is modified, the operation is complicated, time-consuming and labor-intensive

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