High-precision control forming composite taphole pipe brick and its manufacturing method

Abstract

The invention discloses a high-accuracy-control-molded composite tap hole tubular brick and a manufacturing method thereof. The composite tap hole tubular brick comprises an inner wall, an outer wall and a thin-wall barrel between the inner wall and the outer wall. Main raw materials of the composite tap hole tubular brick include high-purity magnesia, fused magnesia, graphite, antioxidants and binding agents. The manufacturing process includes the following steps of preparing, mixing grinding, green body molding, heat treating and assembling. In the mixing grinding step, the raw materials of the inner wall and the raw materials of the outer wall are independently mixed and ground. According to the high-accuracy-control-molded composite tap hole tubular brick, the length can be designed according to the requirements of steel mills, and the high-accuracy-control-molded composite tap hole tubular brick further has the beneficial effects that the amount of later-period machining finishing is small, the raw materials are saved, appearance is attractive, assembling and transporting are convenient, and integrality is high; and as the composite tap hole tubular brick is made of two kinds of fireproof materials in the diameter direction, and the ratio of the two kinds of materials is adjusted according to practical conditions of the steel mills, the beneficial effects that in the whole use process of the tubular brick, the tapping speed is relatively stable, and the quality of molten steel is relatively stable can be achieved on the premise of guaranteeing the whole service life of the tubular brick.

Description

technical field [0001] The invention belongs to the technical field of metallurgical refractory materials, and in particular relates to a high-precision control formed composite taphole pipe brick and a manufacturing method thereof. Background technique [0002] The tap hole is the only channel for molten steel to enter the ladle from the converter. When tapping, it has to bear the frictional erosion and oxidation erosion of high temperature molten steel and slag, coupled with the effect of rapid cooling and rapid heating, resulting in a very short service life of the tapping hole, which requires constant repair and replacement, which not only affects the production cycle, but also affects the quality of molten steel and production stability. The size of the inner diameter of the tapping hole directly affects the speed of the tapping speed and the length of the tapping time. The inner diameter of the tapping hole is relatively small at the initial stage of use, the tapping...

AI Technical Summary

Problems solved by technology

However, the isostatic pressing of the taphole pipe brick often has the following disadvantages: 1. Due to the limitation of the forming equipment, the taphole pipe brick product beyond a certain length cannot be formed; 2. Since the direction of the isostatic pressure is from the outside to the inside, As a result, the performance of the inner and outer walls of the taphole pipe brick is uneven; 3. The precision of the isostatic pressing forming of the taphole pipe brick is not high, and the post-processing and trimming amount is large, resulting in waste of raw materials and time; 4. Due to the large volume, the Inconvenient for transportation and construction

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