Magnesium-calcium gunning mix suitable for smelting clean steel, and preparation method and application thereof

Abstract

The invention discloses a magnesium-calcium gunning mix suitable for smelting clean steel, a preparation method thereof, and application of the magnesium-calcium gunning mix in smelting the clean steel. The magnesium-calcium gunning mix is prepared from, by mass, 10 to 40 parts of magnesium-calcium sand, 40 to 90 parts of magnesia material and 10 to 26 parts of magnesium-silicon gel agent; the magnesium-silicon gel agent is prepared from, by mass, 5 to 15 parts of a magnesium binding agent, 2 to 5 parts of a phosphate binding agent, 1 to 4 parts of slaked lime micro powder, 0.05 to 0.5 part of a thickening agent and 0.05 to 1.5 parts of an anti-explosion agent' the granularity of the magnesium binding agent is not greater than 5 [mu]m, the content of MgO in the magnesium binding agent is greater than or equal to 77.00 wt%, the content of SiO2 is greater than or equal to 13.00 wt%, and the ignition loss at 950 DEG C is less than or equal to 6.0 wt%; and the magnesium-silicon gel agent is obtained by co-grinding the raw materials, and the particle size is not greater than 3 [mu]m. The preparation method comprises the following steps: uniformly stirring the raw materials which comprise the magnesia-calcium sand, the magnesia material and the magnesia-silicon gel agent and form the magnesia-calcium gunning mix in a mixer to obtain the magnesia-calcium gunning mix.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesium-calcium gunning material suitable for smelting clean steel and its preparation method and application. Background technique [0002] With the continuous development of steelmaking technology, it is important to promote high-performance advanced refractory materials with high efficiency, energy saving, functionalization, long life and safety, reduce the consumption and cost of refractory materials, and increase the service life of working linings in converters, ladles, RH furnaces and tundishes. It is an inevitable trend. At present, gunning and maintenance of furnace lining materials is one of the important measures to prolong the service life and reduce the consumption of refractory materials. [0003] However, with the increase of high-grade special steel varieties, especially the sharp increase in demand for clean steel, aluminum-killed steel and silic...

AI Technical Summary

Problems solved by technology

Chinese patent CN200910097752.2 relates to a formula of gunning material for converters, the main raw materials are forsterite, dolomite, mid-grade magnesia and binder, and there is a problem of low service life

Because the matrix contains a large amount of clay, bentonite or sodium silicate, a large amount of low-melt phase is formed at high temperature, and the amount of water added is high, which is not conducive to the corrosion resistance of molten steel and slag resistance, resulting in poor service life of the gunning material

[0005] In addition, the micropowder, binder and admixture in the semi-dry gunning material matrix are dispersed and added. Due to the difference in mixing equipment, the components in the matrix are unevenly distributed. Short, easy to cause muzzle blockage, uneven water material, cause gunning material to fall and collapse, thus affecting gunning effect

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