Refractory material for steel tapping hole of converter and preparation method for refractory material

Abstract

The invention relates to a refractory material for a steel tapping hole of a converter and a preparation method for the refractory material. The technical scheme of the invention is as follows: the preparation method comprises the steps of spraying the surface of a magnesia-carbon brick body with a glaze slip coating with the thickness of 1mm to 2mm, carrying out drying, and carrying out heat preservation, thereby preparing the refractory material for the steel tapping hole of the converter. A preparation method for the magnesia-carbon brick body comprises the steps: mulling magnesia fines, flake graphite fines, expandable graphite, aluminum powder and silicon powder in a high-speed mulling machine, so as to prepare mixed fine powder; and then, mulling fused magnesia granules and artificial graphite granules, adding phenol-formaldehyde resin into the mixture, carrying out mulling, then, adding granulated graphite and the mixed fine powder into the mulled mixture, carrying out mulling, carrying out aging, carrying out shaping, and carrying out standing, thereby preparing the magnesia-carbon brick body. A preparation method for glaze slip comprises the steps of adding water into glass powder, spodumene, potassium feldspar, silicon micropowder, potassium carbonate, SiC fines, chrome green and aluminum dihydrogen phosphate, which serve as raw materials of the glaze slip, and carrying out grinding, thereby preparing the glaze slip. The refractory material for the steel tapping hole of the converter, prepared by the preparation method, has the characteristics that the thermal shock stability is good, the integrity is good, the oxidation resistance is good, the erosion resistance is good, and the life is long.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a converter tapping hole refractory material and a preparation method thereof. [0002] technical background [0003] The converter taphole is the pipeline through which the smelted molten steel enters the ladle from the converter. Its structure and quality have a direct impact on the product quality, production cycle, production stability and efficiency of molten steel smelting. The material and life are the guarantee of production safety. , The number of times the converter taphole is used is one of the comprehensive manifestations of the converter smelting index. [0004] The taphole of the converter will be scoured and eroded by the high temperature of molten steel during tapping. At the same time, the taphole of the magnesia-carbon brick will undergo oxidation reaction due to various factors such as the atmosphere in the molten steel at high temperat...

AI Technical Summary

Problems solved by technology

[0004] The taphole of the converter will be scoured and eroded by the high temperature of molten steel during tapping. At the same time, the taphole of the magnesia-carbon brick will undergo oxidation reaction due to various factors such as the atmosphere in the molten steel at high temperature, which will greatly reduce the service life; The refractory material at the taphole before and after the first tapping is also affected by the rapid temperature change. In the long run, the refractory material will deteriorate and be damaged under the combined action of various above factors, which will significantly affect the performance and life of the converter taphole

At present, magnesia-carbon materials are mostly used in the taphole of the converte