Magnesium-calcium gunning material suitable for smelting clean steel and its preparation method and application

Abstract

The invention discloses a magnesium-calcium gunning material suitable for smelting clean steel, a preparation method thereof and an application in smelting clean steel. In terms of parts by mass, the raw materials of magnesium-calcium gunning materials include: 10-40 parts of magnesia-calcium sand, 40-90 parts of magnesia material, 10-26 parts of magnesium silica gel coagulant; The raw materials of the agent include: 5-15 parts of magnesium binder, 2-5 parts of phosphate binder, 1-4 parts of slaked lime powder, 0.05-0.5 parts of thickener, 0.05-1.5 parts of explosion-proof agent; The particle size is not more than 5μm, and the MgO content in its composition is ≥77.00wt%, SiO 2 The content is ≥13.00wt%, and the loss on ignition at 950°C is ≤6.0wt%. The magnesium silica gel is obtained by co-grinding the raw materials that make it up, and the particle size is not greater than 3μm. The preparation method comprises: stirring evenly the raw materials constituting the magnesia-calcium gunning material including magnesia-calcium sand, magnesia material and magnesium-silica coagulant in a mixer to obtain the magnesia-calcium gunning material.

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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