Composite electric furnace bottom ramming material for synthesizing spinel-magnesium-calcium-iron sand and preparation method thereof

A technology of magnesia-calcium-iron sand and ramming material, which is applied in the field of synthetic spinel-magnesia-calcium-iron sand composite electric furnace bottom ramming material and its preparation field, which can solve the problem of restricting the development of steelmaking technology, the sintered layer of the furnace bottom is too thick and falls off and other problems, to achieve the effect of reducing furnace bottom cracking, prolonging life, and prolonging service life

Active Publication Date: 2020-07-14
北京利尔高温材料股份有限公司
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AI Technical Summary

Problems solved by technology

Therefore, the original MgO-Fe 2 o 3 -CaO-based electric furnace bottom ramming material can no longer be well adapted to the existing metallurgical process, and it is easy to cause too thick sintered layer at the bottom of the furnace, causing cracking and serious shedding, which has always restricted the development of steelmaking technology

Method used

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  • Composite electric furnace bottom ramming material for synthesizing spinel-magnesium-calcium-iron sand and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a kind of preparation method of compound electric furnace bottom ramming material, comprises the following steps:

[0040] 1) After mixing the raw materials of the synthetic sand, sequentially carry out mixing, molding, sintering and refinement to obtain the synthetic sand;

[0041] 2) The obtained synthetic sand is mixed with a clay binder to obtain a composite electric furnace bottom ramming material.

[0042] The mixing in the present invention is preferably uniform mixing in wet milling.

[0043] The mixing time of the present invention is preferably ≥ 20 min, more preferably ≥ 30 min.

[0044] The molding in the present invention is preferably briquette molding, and the briquette molding is that uniformly mixed materials are sent to a briquetting machine via a conveyor belt for briquetting.

[0045] The sintering temperature in the present invention is preferably ≥1700°C, more preferably ≥1800°C; the sintering time is preferabl...

Embodiment 1

[0052] Mix 52kg of waste magnesia-carbon brick particles, 16kg of lightly burned dolomite powder, 23kg of lightly burned magnesia powder, 4kg of slaked lime powder, and 5kg of iron oxide red and mix them in a wet mill for 20 minutes. The evenly mixed material is pressed into balls in a briquetting machine Forming, the formed material is sintered in a high-temperature shaft kiln at 1700°C for 3 hours, and the speed of the bottom blower is 800r / min. The sintered material is first crushed by a jaw crusher, and then crushed by a roller crusher into particles with a particle size of ≤6mm; and then sieved by a particle size screening machine to obtain three particle sizes of 6~3mm, 3~1mm, and ≤1mm. ; The sintered material is also finely ground into particles with a particle size of ≤0.074mm by a ball mill. Finally, dry mix 20kg of 6-3mm components, 32kg of 3-1mm components, 47kg≤1mm components (including 15kg≤0.074mm components) and 1kg of clay binder in a mixer for 10 minutes to ob...

Embodiment 2

[0054] Mix 55kg of waste magnesia-carbon brick particles, 14kg of lightly burned dolomite powder, 20kg of lightly burned magnesia powder, 6kg of slaked lime powder, and 5kg of iron oxide red and mix them in a wet mill for 25 minutes. The evenly mixed material is pressed into balls in a briquetting machine Forming, the formed material is sintered in a high-temperature shaft kiln at 1750°C for 3 hours, and the speed of the bottom blower is 900r / min. The sintered material is first crushed by a jaw crusher, and then crushed by a roller crusher into particles with a particle size of ≤6mm; and then sieved by a particle size screening machine to obtain three particle sizes of 6~3mm, 3~1mm, and ≤1mm. ; The sintered material is also finely ground into particles with a particle size of ≤0.074mm by a ball mill. Finally, dry mix 24kg of 6-3mm components, 27kg of 3-1mm components, 47kg≤1mm components (including 13kg≤0.074mm components) and 2kg of clay binder in a mixer for 15 minutes to ob...

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Abstract

The invention belongs to the field of refractory materials. The invention provides a composite electric furnace bottom ramming material for synthesizing spinel-magnesia-calcium-iron sand by taking waste magnesia-carbon bricks as raw materials. The composite electric furnace bottom ramming material comprises the following components in parts by weight: 92-109 parts of synthetic sand and 1-3 parts of a clay binding agent, in the raw materials for preparing the synthetic sand, the weight ratio of the magnesia carbon brick particles to the light calcined dolomite powder to the light calcined magnesium powder to the slaked lime powder to the iron oxide red is (50-55):(12-16):(20-25):(4-8):(4-6). The invention further provides a preparation method of the composite electric furnace bottom rammingmaterial. Spinel generated by adopting the method is crossed with periclase and dicalcium ferrite, so that the defect of high porosity of spinel is avoided, the thickness of a sintering layer at thebottom of the electric furnace is further reduced, and the phenomena of cracking and bleed-out of the bottom of the furnace are further reduced. The prepared composite electric furnace bottom rammingmaterial is good in comprehensive performance, excellent in high-temperature performance and long in service life.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a composite electric furnace bottom ramming material for synthesizing spinel-magnesia-calcium-iron sand with magnesia-carbon bricks as raw materials and a preparation method thereof. Background technique [0002] The traditional electric furnace bottom ramming material uses lightly burned magnesia-calcium powder as raw material, and synthesizes magnesia-calcium iron sand through precise processing technology. Because of its good corrosion resistance and easy sintering, at present, steel mills at home and abroad still mainly use MgO-Fe 2 o 3 -CaO-based unshaped refractory material is used as ramming material for the bottom of the electric furnace. With the improvement of users' requirements for steel quality, in recent years, steel mills have increased comprehensive economic indicators such as the cost per ton of steel, and have continuously adopted new electric furn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622
CPCC04B35/043C04B35/62204C04B2235/3208C04B2235/321C04B2235/3272C04B2235/349C04B2235/6567C04B2235/9607
Inventor 耿鹏王团收任林赵现华张盛李健高梅刘美荣
Owner 北京利尔高温材料股份有限公司
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