Composite slag stopper for blocking primary slag of converter and manufacturing method thereof

Abstract

The invention relates to a composite slag stopper for blocking the primary slag of a converter and a manufacturing method thereof, comprising a refractory plastic layer, a plastic film, a round table 1 and a round table 2, and the round table 1 and the round table 2 are an integral structure, and a Through hole, the outer diameter of round table one is smaller than the outer diameter of round table two, and the outside of round table one is provided with a fire-resistant plastic layer made of refractory plastic, and the plastic film is covered on the outer surfaces of round table one, round table two, and the fire-resistant plastic layer. Among them, 1) round table 1 and round table 2 are made of moulds, and are made by ramming, pouring, or machine pressing; 2) refractory plastic is attached to the outside of the finished round table 1 and round table 2 to form a steel pipe with an outer diameter larger than that of tapping. The structure of the mouth diameter; 3) the plastic film is placed on the outside of the finished product in step 2). The advantages are: it can effectively withstand the initial slag pressure of the converter, and when it encounters molten steel, the composite slag stopper will melt under the double action of the weight and temperature of the molten steel, realizing the purpose of blocking the initial slag of the converter.

Description

technical field [0001] The invention relates to a plugging device for a tap hole of a converter, in particular to a composite slag stopper for blocking primary slag of a converter and a manufacturing method thereof. Background technique [0002] At present, in order to block the initial slag when the converter is tapping, the steel factory generally uses a hard slag stopper and a plastic soft slag stopper. The hard slag stopper is a plug inserted from the outside of the tapping hole The conical frustum-shaped slag stopper, the disadvantage of this kind of slag stopper is: because the outer dimension of the slag stopper is fixed, and the diameter of the taphole increases with the number of tapping furnaces, the diameter of the taphole varies for each furnace In changing conditions, the hard slag blocking brick cannot achieve a close fit with the tap hole, and the hard slag blocking plug often falls off during the shaking furnace process, and the slag blocking effect is poor; ...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to block the initial slag when the converter is tapping, the steel factory generally uses a hard slag stopper and a plastic soft slag stopper. The hard slag stopper is a plug inserted from the outside of the tapping hole The conical frustum-shaped slag stopper, the disadvantage of this kind of slag stopper is: because the outer dimension of the slag stopper is fixed, and the diameter of the taphole increases with the number of tapping furnaces, the diameter of the taphole varies for each furnace In changing conditions, the hard slag blocking brick cannot achieve a close fit with the tap hole, and the hard slag blocking plug often falls off during the shaking furnace process, and the slag blocking effect is poor; the plastic soft slag blocking plug, the plug body can be Deformation, can adapt to the change of the diameter of the tap hole, and achieve a close fit with the tap hole, but because the plastic slag stopper is composed of an unshaped refractory material plus a certain binder and admixture, the fire resistance is poor and the strength is low , it melts when encountering the primary slag of the converter, and cannot withstand the pressure of the primary slag of the converter, and some of the initial slag enters the molten steel tank, which not only affects the quality of molten steel, but also increases the cost of steelmaking

[0003] Some of the existing slag stoppers use steel material as the intermediate support. Due to the material, the melting speed of this structure is slow and it is easy to cause blockage. At the same time, the hardness of the steel material is too high, which may cause damage to the tap hole, so it is not suitable to use

Images