Low carbon magnesia-carbon brick, method for manufacturing the same and use thereof

Abstract

The invention relates to a low-carbon magnesia carbon brick and a making method and application thereof. The low-carbon magnesia carbon brick is characterized in that the low-carbon magnesia carbon brick comprises the following compositions: 15 to 25 percent of 5-3 mm fused magnesia, 20 to 30 percent of 3-1 mm fused magnesia, 20 to 40 percent of fused magnesia which is less than or equal to 1 mm, 1 to 10 percent of fused magnesia which is less than or equal to 75 mu m, 1 to 10 percent of fused magnesia which is less than or equal to 45 mu m, 1 to 5 percent of micronized graphite which is less than or equal to 6 mu m, 1 to 5 percent of 10-100 nm nano-carbon materials, and additives, wherein the additives comprise the following compositions: A, 0.5 to 3 percent of boron carbide powder, and B, 0.5 to 3 percent of metal aluminum powder; the sum of the various compositions is 100 percent; and 3 to 5 percent of binding agent - liquid phenol-formaldehyde resin is added. The compositions are subjected to uniform mixing and brick molding for standby. The low-carbon magnesia carbon brick is applied to the upper part, the middle part and the lower part of a VD ladle or a VOD ladle or an RH vacuum heat treatment device. When the low-carbon magnesia carbon brick is applied to a 50 ton VD ladle, the ladle is subjected to whole-course argon blowing treatment for 50 to 90 minutes; the temperature of purified molten steels is between 1,580 and 1,620 DEG C; the service life of the ladle is 90 furnaces; and the problem of recarburization of the molten steels is avoided.

Description

technical field

[0001] The invention relates to a low-carbon magnesia-carbon brick, a production method and its application, more precisely, a low-carbon magnesia-carbon brick for low-carbon steel and ultra-low-carbon clean steel smelting thermal equipment lining the working layer refractory material and its production The method particularly relates to a low-carbon magnesia-carbon brick prepared by gradation of fused magnesia, pre-synthesized fused magnesia-zirconium sand, micronized graphite, metal fine powder, etc., and a preparation method, belonging to the field of refractory materials. Background technique

[0002] With the continuous improvement of the market's quality requirements for steel products, the technical level of the modern steel industry must continue to improve. Low-carbon and ultra-low-carbon clean steel has become the focus of development. The secondary refining process mostly uses vacuum, strong stirring, and oxidant injection. method, by improving the...

Examples

Embodiment 1

[0042]The specific ratio is 5-3mm fused magnesia 15%, 3-1mm fused magnesia 26%, ≤1mm fused magnesia 33.5%, ≤75μm fused magnesia 10%, ≤45μm fused magnesia-zircon 6 %, ≤6μm micronized graphite 5%, 10-100nm nano-carbon material 1.5%, boron carbide powder 1.5%, metal aluminum powder 1.5%, plus liquid phenolic resin binder 4.2%, after weighing according to the proportion, proceed according to the production process Production.

[0043] according to figure 1 The shown mixing process mixing is specifically:

[0044] ① First, stir the electro-fused pellets with different particle size ratios for 3-5 minutes and mix them evenly, then add the binder and mix them for 3-5 minutes, then add micronized graphite and mix them for 8-10 minutes;

[0045] ②At the same time, pre-mix the nano-carbon material, fused magnesia (≤75μm) fused magnesia-zirconium sand, boron carbide powder and metal aluminum powder for 20-30 minutes;

[0046] ③ Mix the mixture of steps ① and ② and then knead for 10 to...

Embodiment 2

[0051] The specific ratio is 5-3mm fused magnesia 20%, 3-1mm fused magnesia 25%, ≤1mm fused magnesia 30.2%, ≤75μm fused magnesia 8%, ≤45μm fused magnesia-zircon 10 %, ≤6μm micronized graphite 3%, 10-100nm nano-carbon material 1%, boron carbide powder 0.8%, metal aluminum powder 2%, liquid phenolic resin binder 3.7%, after weighing according to the formula, produce according to the production process . (with embodiment 1)

[0052] This example provides low-carbon magnesia-carbon bricks containing 88.32 mass percent MgO, 4.3 C, and 4.3 ZrO 2 is 1.02.

[0053] The comparison between the tested and traditional high-carbon magnesia-carbon brick indicators is shown in Table 3:

[0054] table 3

[0055]

technical field

[0001] The invention relates to a low-carbon magnesia-carbon brick, a production method and its application, more precisely, a low-carbon magnesia-carbon brick for low-carbon steel and ultra-low-carbon clean steel smelting thermal equipment lining the working layer refractory material and its production The method particularly relates to a low-carbon magnesia-carbon brick prepared by gradation of fused magnesia, pre-synthesized fused magnesia-zirconium sand, micronized graphite, metal fine powder, etc., and a preparation method, belonging to the field of refractory materials. Background technique

[0002] With the continuous improvement of the market's quality requirements for steel products, the technical level of the modern steel industry must continue to improve. Low-carbon and ultra-low-carbon clean steel has become the focus of development. The secondary refining process mostly uses vacuum, strong stirring, and oxidant injection. method, by improving the...

Examples

Embodiment 1

[0042]The specific ratio is 5-3mm fused magnesia 15%, 3-1mm fused magnesia 26%, ≤1mm fused magnesia 33.5%, ≤75μm fused magnesia 10%, ≤45μm fused magnesia-zircon 6 %, ≤6μm micronized graphite 5%, 10-100nm nano-carbon material 1.5%, boron carbide powder 1.5%, metal aluminum powder 1.5%, plus liquid phenolic resin binder 4.2%, after weighing according to the proportion, proceed according to the production process Production.

[0043] according to figure 1 The shown mixing process mixing is specifically:

[0044] ① First, stir the electro-fused pellets with different particle size ratios for 3-5 minutes and mix them evenly, then add the binder and mix them for 3-5 minutes, then add micronized graphite and mix them for 8-10 minutes;

[0045] ②At the same time, pre-mix the nano-carbon material, fused magnesia (≤75μm) fused magnesia-zirconium sand, boron carbide powder and metal aluminum powder for 20-30 minutes;

[0046] ③ Mix the mixture of steps ① and ② and then knead for 10 to...

Embodiment 2

[0051] The specific ratio is 5-3mm fused magnesia 20%, 3-1mm fused magnesia 25%, ≤1mm fused magnesia 30.2%, ≤75μm fused magnesia 8%, ≤45μm fused magnesia-zircon 10 %, ≤6μm micronized graphite 3%, 10-100nm nano-carbon material 1%, boron carbide powder 0.8%, metal aluminum powder 2%, liquid phenolic resin binder 3.7%, after weighing according to the formula, produce according to the production process . (with embodiment 1)

[0052] This example provides low-carbon magnesia-carbon bricks containing 88.32 mass percent MgO, 4.3 C, and 4.3 ZrO 2 is 1.02.

[0053] The comparison between the tested and traditional high-carbon magnesia-carbon brick indicators is shown in Table 3:

[0054] table 3

[0055]

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