Nano-matrix-combined high-performance fused magnesium calcium brick and manufacturing method thereof

A fused magnesia-calcium brick, nano-scale technology, applied in the field of nano-scale matrix combined with high-performance fused magnesia-calcium bricks and its manufacturing, can solve the problems of poor corrosion resistance of magnesia-calcium bricks, age of magnesia-calcium brick blast furnace, high calcium There are no more mature production technology solutions for magnesia-calcium bricks, and the effects of improving hydration resistance, compressive strength, and good high-temperature volume stability are achieved.

Active Publication Date: 2015-09-02

LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

At present, the performance of magnesia-calcium bricks can no longer meet the age and low-cost target requirements of steel mills. For example, a 180-ton AOD furnace in a domestic steel plant has poor corrosion resistance due to the poor corrosion resistance of magnesia-...

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Abstract

The invention provides a nano-matrix-combined high-performance fused magnesium calcium brick and a manufacturing method thereof. The fused magnesium calcium brick is prepared from 8-5mm high-calcium fused magnesium calcium sand, 5-2mm high-calcium fused magnesium calcium sand, 2-0mm high-calcium fused magnesium calcium sand, <=0.074mm high-calcium fused magnesium calcium sand, 8-5mm fused magnesite, 5-2mm fused magnesite, 2-0mm fused magnesite, <=0.074mm fused magnesite fine powder, nano sea water magnesia fine powder and a binder paraffin. The manufacturing method comprises the following steps: fine powder premixing, integral compounding, molding, drying, firing and the like. The product has the advantages of compact microstructure, fewer low-melting-point minerals, higher erosion resistance, higher scour resistance, higher stripping resistance and higher hydration resistance. The furnace life is prolonged by 30% above on average. Thus, the product satisfies the requirements of high efficiency, long service life and high cleanness for stainless steel and special steel smelting, and lowers the cost for the steel enterprises.

Technology Topic

MicrostructureMineralogy +6

Examples

Experimental program(3)

Example Embodiment

[0032] Example 1

[0033] A nano-scale matrix combined with high-performance fused magnesia-calcium brick is made of the following raw materials in proportion by weight:

[0034] 5 parts of 8~5mm high-calcium fused magnesia-calcium sand,

[0035] 25 parts of 5~2mm high-calcium fused magnesia-calcium sand,

[0036] 25 parts of 2~0mm high-calcium fused magnesia-calcium sand,

[0037] ≤ 0.074mm High-calcium fused magnesia-calcium sand fine powder 10 parts,

[0038] 5 parts of 8~5mm fused magnesia,

[0039] 5~2mm fused magnesia 10 parts,

[0040] 2~0mm fused magnesia 5 parts,

[0041] ≤ 0.074mm fused magnesia fine powder 10 parts,

[0042] Nanoscale seawater magnesia fine powder 5 parts,

[0043] Binder 2~5 parts.

[0044] The physical and chemical indicators of the nano-scale seawater magnesia fine powder, high-calcium fused magnesia-calcium sand, and fused magnesia are as follows:

[0045] project Nano-scale seawater magnesia fine powder High calcium fused magnesia calcium sand Fused magnesia MgO, % ≥98.00 ≥50.00 ≥97.00 CaO, % ≤1.00 ≥48.00 ≤1.50 ΣSiO 2 +Al 2 o 3 +Fe 2 o 3 ,% ≤1.00 ≤1.20 ≤1.50 CaO/SiO 2 ≥2 — ≥2 Bulk density, g/cm 3 ≥3.45 ≥3.30 ≥3.48

[0046] The binding agent is paraffin.

[0047] The manufacturing method of the above-mentioned nano-scale matrix combined with high-performance fused magnesia-calcium bricks includes the following process steps:

[0048]1) Raw material crushing: the raw materials of high-calcium fused magnesia-calcium sand and fused magnesia are successively crushed, screened, and pulverized by jaw crusher, double-roll crusher, and Raymond mill to produce Granular materials with a particle size of 8~5mm, 5~2mm, and 2~0mm and fine powder materials with a particle size of ≤0.074mm;

[0049] 2) Fine powder premixing: Mix nano-scale seawater magnesia fine powder with high-calcium fused magnesia-calcium sand fine powder and fused magnesia fine powder with a particle size of ≤0.074mm according to the required weight ratio;

[0050] 3) Mixing: Send all the raw materials into the high-speed mixer for mixing according to the weight of the requirements. Mix fused magnesia-calcium sand and fused magnesia for 5-7 minutes, then add binder paraffin and mix for 5-7 minutes, then add the pre-mixed fine powder in step 2) and mix for 8-12 minutes, mix well and discharge;

[0051] 4) Cooling material: Send the evenly mixed mud material to the material drying platform for material turning, heat dissipation, cooling, and the temperature drops to room temperature;

[0052] 5) Molding: Weigh the specified weight of mud, put it evenly into the mold cavity of the brick press, and form it under high pressure with a thousand-ton press. 3 times, gravity pressing 5~8 times;

[0053] 6) Firing: Put the above-mentioned formed bricks on the kiln car of the tunnel kiln, and then directly go through the tunnel kiln for high-temperature firing at a firing temperature of 1560~1600°C;

[0054] 7) Sorting, processing and packaging: The magnesia-calcium bricks leaving the kiln do not need to be dipped in wax. After cooling, they are sorted, brick-grinded, vacuum-packed, and then put into the finished product warehouse.

[0055] The finished product test results of this embodiment are shown in Table 1.

Example Embodiment

[0056] Example 2

[0057] A nano-scale matrix combined with high-performance fused magnesia-calcium brick is made of the following raw materials in proportion by weight:

[0058] 5 parts of 8~5mm high-calcium fused magnesia-calcium sand,

[0059] 5~2mm high calcium fused magnesia calcium sand 30 parts,

[0060] 25 parts of 2~0mm high-calcium fused magnesia-calcium sand,

[0061] ≤ 0.074mm high calcium fused magnesia calcium sand fine powder 15 parts,

[0062] 5 parts of 8~5mm fused magnesia,

[0063] 5 parts of 5~2mm fused magnesia,

[0064] 2~0mm fused magnesia 5 parts,

[0065] ≤ 0.074mm fused magnesia fine powder 5 parts,

[0066] Nanoscale seawater magnesia fine powder 5 parts,

[0067] Binder 2~5 parts.

[0068] The physical and chemical indicators of the nano-scale seawater magnesia fine powder, high-calcium fused magnesia-calcium sand, and fused magnesia are as follows:

[0069] project Nano-scale seawater magnesia fine powder High calcium fused magnesia calcium sand Fused magnesia MgO, % ≥98.00 ≥50.00 ≥97.00 CaO, % ≤1.00 ≥48.00 ≤1.50 ΣSiO 2 +Al 2 o 3 +Fe 2 o 3 ,% ≤1.00 ≤1.20 ≤1.50 CaO/SiO 2 ≥2 — ≥2 Bulk density, g/cm 3 ≥3.45 ≥3.30 ≥3.48

[0070] The binding agent is paraffin.

[0071] The manufacturing method of the above-mentioned nanoscale matrix combined with high-performance fused magnesia-calcium bricks has the same process steps as those described in Example 1. The finished product test results of this embodiment are shown in Table 1.

Example Embodiment

[0072] Example 3

[0073] A nano-scale matrix combined with high-performance fused magnesia-calcium brick is made of the following raw materials in proportion by weight:

[0074] 8mm~5mm high-calcium fused magnesia-calcium sand 5 parts,

[0075] 5mm~2mm high-calcium fused magnesia-calcium sand 35 parts,

[0076] 2mm~0mm high-calcium fused magnesia-calcium sand 30 parts,

[0077] ≤ 0.074mm high calcium fused magnesia calcium sand fine powder 15 parts,

[0078] 8mm~5mm fused magnesia 5 parts,

[0079] ≤ 0.074mm fused magnesia fine powder 5 parts,

[0080] Nanoscale seawater magnesia fine powder 5 parts,

[0081] Binder 2~5 parts.

[0082] The physical and chemical indicators of the nano-scale seawater magnesia fine powder, high-calcium fused magnesia-calcium sand, and fused magnesia are as follows:

[0083] project Nano-scale seawater magnesia fine powder High calcium fused magnesia calcium sand Fused magnesia MgO, % ≥98.00 ≥50.00 ≥97.00 CaO, % ≤1.00 ≥48.00 ≤1.50 ΣSiO 2 +Al 2 o 3 +Fe 2 o 3 ,% ≤1.00 ≤1.20 ≤1.50 CaO/SiO 2 ≥2 — ≥2 Bulk density, g/cm 3 ≥3.45 ≥3.30 ≥3.48

[0084] The binding agent is paraffin.

[0085] The manufacturing method of the above-mentioned nanoscale matrix combined with high-performance fused magnesia-calcium bricks has the same process steps as those described in Example 1. The finished product test results of this embodiment are shown in Table 1.

[0086] The physical and chemical indicators of each embodiment finished product without wax dipping in table 1

[0087] project Example 1 Example 2 Example 3 MgO, % 67.28 62.72 58.10 CaO, % 31.26 35.88 40.48 ΣSiO 2 +Al 2 o 3 +Fe 2 o 3 ,% 1.08 1.00 1.00 L.O.I., % 0.38 0.40 0.42 Bulk density, g/cm 3 3.15 3.12 3.11 Apparent porosity, % 6 6 7 Normal temperature compressive strength, MPa 92 90 88 Softening temperature under load, ℃ ≥1700 ≥1700 ≥1700

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PUM

Property	Measurement	Unit
Granularity	<= 0.074	mm
Granularity	0.0 ~ 8.0	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Coarse grain
Evenly distributed

Electrical pure iron annealing method

InactiveCN112126755ARaise the annealing temperatureCoarse grainNitrogen gasCooling speed

Owner:深圳市正灿科技有限公司

Nano-matrix-combined high-performance fused magnesium calcium brick and manufacturing method thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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