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Special magnesia-calcium brick and manufacturing method thereof

A special magnesia-calcium brick and magnesia-calcium brick technology is applied in the field of refractory materials for stainless steel smelting furnaces, which can solve the problems affecting the high-temperature service performance and service life of magnesia-calcium bricks, insufficient erosion resistance and slag resistance, and can not meet the needs of refining customer blast furnaces. Age and other issues, to achieve the effect of improving high temperature performance and corrosion resistance, improving high temperature strength and thermal shock stability, and reducing grain density defects.

Inactive Publication Date: 2020-03-27
LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing magnesia-calcium bricks are produced by the ratio of synthetic sand + ordinary fused magnesia, and the main purpose of adding ordinary fused magnesia is to improve the corrosion resistance of refractory materials. Ordinary fused magnesia (main component MgO≥97 %, CaO≤1.20, SiO 2 ≤1.20), Ca / Si=1:1, ordinary fused magnesia has low melting point compound CaO.MgO.SiO 2 (calcium-magnesium olivine, melting point 1390°C), which seriously affects the high-temperature performance and service life of existing magnesia-calcium bricks
[0004] With the gradual increase in the production capacity of stainless steel and clean steel in my country, the related supporting smelting has gradually realized large-scale and the rapid development of smelting technology, and the low service life of its supporting refractory materials has become an objective factor affecting the development of smelting technologies such as AOD furnaces and VOD furnaces. Especially in some large-scale refining furnaces: for example, the 180-ton AOD furnace of a domestic steel plant, due to the lack of corrosion resistance and slag resistance of the matching magnesia-calcium bricks, the wind eye area and slag line area were severely damaged. The existing magnesia-calcium bricks can no longer meet the requirements of refining customers for blast furnace age and low cost.

Method used

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  • Special magnesia-calcium brick and manufacturing method thereof
  • Special magnesia-calcium brick and manufacturing method thereof
  • Special magnesia-calcium brick and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A special magnesia-calcium brick and a manufacturing method thereof are prepared from the following raw materials in proportions by weight:

[0083]

[0084] The physical and chemical indicators of the high-calcium fused magnesia, magnesia-calcium sand and magnesium titanate are as follows:

[0085] Table 3 Physical and chemical indicators of each raw material

[0086]

[0087]

[0088] The binding agent is paraffin.

[0089] The process for manufacturing the above-mentioned special magnesia-calcium bricks comprises the following steps:

[0090] 1) Raw material crushing: the raw materials of high-calcium fused magnesia-calcium sand and magnesia-calcium sand are successively crushed, screened, and pulverized by a jaw crusher, a double-roller crusher, and a Raymond mill to produce Granular material with a particle size of 8-5mm, 5-2mm, 2-0.088mm and fine powder ≤0.074mm and ≤0.037mm;

[0091] 2) Fine powder premixing: mix high-calcium fused magnesia fine powde...

Embodiment 2

[0099] A special magnesia-calcium brick and a manufacturing method thereof are prepared from the following raw materials in proportions by weight:

[0100]

[0101] The physical and chemical indicators of the high-calcium fused magnesia, magnesia-calcium sand and magnesium titanate are as follows:

[0102] Table 4 Physical and chemical indicators of each raw material

[0103]

[0104]

[0105] The binding agent is paraffin.

[0106] The process for manufacturing the above-mentioned special magnesia-calcium bricks comprises the following steps:

[0107] 1) Raw material crushing: the raw materials of high-calcium fused magnesia-calcium sand and magnesia-calcium sand are successively crushed, screened, and pulverized by a jaw crusher, a double-roller crusher, and a Raymond mill to produce Granular material with a particle size of 8-5mm, 5-2mm, 2-0.088mm and fine powder ≤0.074mm and ≤0.037mm;

[0108] 2) Fine powder premixing: mix high-calcium fused magnesia fine powde...

Embodiment 3

[0116] A special magnesia-calcium brick and a manufacturing method thereof are prepared from the following raw materials in proportions by weight:

[0117]

[0118]

[0119] The physical and chemical indicators of the high-calcium fused magnesia, magnesia-calcium sand and magnesium titanate are as follows:

[0120] Table 5 Physical and chemical indicators of each raw material

[0121] project High calcium fused magnesia Magnesia calcium sand Magnesium titanate MgO,% ≥91.00 ≥61.00 — CaO,% 5-8 ≥30 — ΣSiO 2 +Al 2 o 3 +Fe 2 o 3 ,%

≤1.50 ≤2.00 — Bulk density, g / cm 3

≥3.46 ≥3.23 — MgO / TiO 2 (The molar ratio of)

— — 2.000±0.01 CaO(wt%) — — <0.05

Fe 2 o 3 (wt%)

— — <0.05

K 2 O+Na 2 O (wt%)

— — <0.05

Al 2 o 3 (wt%)

— — <0.1

SiO 2 (wt%)

— — <0.1

[0122] The binding agent is paraffin.

[0123] The above-mentioned manufacturing met...

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Abstract

The invention provides a special magnesia-calcium brick and a manufacturing method thereof. The special magnesia-calcium brick is prepared from the following raw materials: 8-5 mm magnesia-calcium sand, 5-2 mm magnesia-calcium sand, 2-0 mm magnesia-calcium sand,<=0.074 mm magnesia-calcium sand fine powder, 8-5 mm high-calcium fused magnesia, 5-2 mm high-calcium fused magnesia, 2-0 mm high-calciumfused magnesia, <=0.074 mm high-calcium fused magnesia fine powder, <= 0.037 mm magnesium titanate ultrafine powder and binder paraffin. The manufacturing method comprises the steps of mixing, forming, sintering and the like. The product disclosed by the invention is low in porosity, high in volume density, high in normal-temperature pressure resistance and high-temperature breaking strength, goodin thermal shock resistance, low in impurity content, good in erosion resistance and strong in erosion resistance, and the anti-stripping performance and slag permeation resistance of the product aresuperior to those of an existing magnesia-calcium brick; the problem of the stainless steel smelting furnace life bottleneck factor of the refractory material service life is solved, the average furnace life is prolonged by 20% or above, and a good foundation is laid for cost reduction and benefit increase of steel mills.

Description

technical field [0001] The invention relates to a special magnesia-calcium brick and a manufacturing method thereof, in particular to the technical field of a refractory material for a stainless steel smelting furnace. Background technique [0002] Magnesia-calcium bricks are basic refractory materials with MgO and CaO as the main components. They are widely used in refining equipment such as AOD furnaces and VOD furnaces for stainless steel and special steel smelting. During use, they are subject to high-temperature melting loss, chemical erosion of slag and Penetration, strong erosion and wear of slag, molten steel and air flow, thermal shock caused by rapid temperature changes and other destructive effects. [0003] The existing magnesia-calcium bricks are produced by the ratio of synthetic sand + ordinary fused magnesia, and the main purpose of adding ordinary fused magnesia is to improve the corrosion resistance of refractory materials. Ordinary fused magnesia (main com...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/622
CPCC04B35/043C04B35/622C04B2235/3201C04B2235/3208C04B2235/3217C04B2235/3234C04B2235/3272C04B2235/3418C04B2235/5427C04B2235/72C04B2235/77C04B2235/96C04B2235/9607
Inventor 苏广深曹振江孟凡昌历彦平康亮付伟郭建
Owner LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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