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Process for synthsizing protecting layer of blast nozzle on furnace by in-situ burning

A technology of in-situ combustion and protective layer, applied in the direction of tuyere, etc., can solve the problems of general wear resistance and energy saving effect, complex preparation method and high cost, and achieve the effect of remarkable energy saving effect, simple preparation process and long service life.

Inactive Publication Date: 2005-03-23
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

[0004] 2. Copper casting tuyere with multi-component metal coating on the surface: anti-oxidation, but the wear resistance is not ideal, and the energy saving effect is poor
[0005] 3. Outer surface surfacing titanium carbide tuyere: wear-resistant, anti-oxidation, corrosion-resistant slag iron, but poor energy-saving effect, high cost
[0006] 4. Tuyere sprayed with high temperature and wear-resistant coating on the surface: the anti-oxidation, wear resistance and energy-saving effects are average, the coating is easy to peel off, and the cost of plasma spraying is relatively high
[0007] 5. The tuyeres where the protective layer is laid on the inner cylinder and the outer cylinder, and the front surface is strengthened: wear-resistant, energy-saving, but it is inconvenient to lay the protective layer on the inner cylinder and the outer cylinder and the front surface is strengthened, such as Kobe Steel’s patented tuyere Wait
However, the preparation process of the inner sleeve of the tuyere is complicated, the on-site construction is inconvenient, and the preparation cost is high
[0011] 6. The front end of the tuyere is equipped with a ceramic tuyere, and the tuyere combined with metal and ceramic: it has good energy-saving effect and prolongs the life of the tuyere, but the preparation method is complicated and inconvenient to use
[0012] 7. The front end of the tuyere and the outer circle, the connecting part of the tuyere sleeve and other components are made of pure copper, and the tuyere welded between pure copper and steel plate: the tuyere cost is low, the energy saving effect is poor, and the service life is not long
[0014] 9. The tuyere inner cavity is knotted with amorphous refractory material: the preparation method is simple, convenient to install, and energy-saving, but it is easy to form low-melting material during use, which affects production

Method used

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  • Process for synthsizing protecting layer of blast nozzle on furnace by in-situ burning
  • Process for synthsizing protecting layer of blast nozzle on furnace by in-situ burning

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] Example 1: 50% by weight of CrO 3 Powder (0.150mm~0.075mm) and 20% by weight of Al powder (0.150mm~0.075mm), 30% by weight of Al 2 o 3 powder (0.150mm-0.075mm), plus 1% by weight of aluminum dihydrogen phosphate solution and stirred evenly to obtain a material with certain plasticity. Under the pressure of 50MPa, the combustion synthetic material is composed of figure 1 Combustion synthetic material is squeezed into the tuyere cavity at 9 places of the extrusion port, and is extruded from 11 places of the combustion synthetic material extrusion port; The cavity formed by the core and the inner surface of the tuyere. The blank was dried at 300°C for 2 hours. In the atmospheric environment at normal temperature, the tungsten wire is energized to ignite and burn the material at the extrusion inlet 9 of the synthetic material, so that the billet can achieve self-propagating sintering. The density of the sintered product is 1.4g / cm 3 , the porosity is 57%, the thermal ...

example 2

[0029] Example 2: with (0.150mm~0.075mm) 40% by weight of CrO Powder and 15% by weight of Cr of the same particle size 2 (SO4)3 powder, 18.5% by weight (0.150mm~0.075mm) Al powder, 26.5% by weight (0.150mm~0.075mm) Al 2 o 3 The powder is added with 2% by weight of aluminum sulfate solution and stirred evenly to obtain a material with certain plasticity. Such as figure 1, Under the pressure of 10MPa, the burning synthetic material squeezes in and ignites the same way as Example 1. The porosity of the sintered product is 30%, the normal temperature compressive strength is 22MPa, and the refractoriness is greater than 1750°C.

example 3

[0030] Example 3: 75.3% by weight of chromite less than 0.3mm, 20.5% by weight of Al powder (0.150mm~0.075mm) less than 0.3mm, and 4.2% by weight of aluminum sulfate solution are stirred evenly to obtain a material with certain plasticity . Such as figure 1 , Under the pressure of 50MPa, the injection method and ignition method of the combustion synthetic material are the same as in Example 1. The porosity of the sintered product is 57%, the normal temperature compressive strength is 58.8MPa, and the refractoriness is greater than 1790°C.

[0031] Example 4: 78.5% by weight of magnesium chromate (0.150mm ~ 0.035mm), 16.4% by weight of Al-Mg powder (0.150mm ~ 0.075mm), 0.1% by weight of Al 2 o 3 powder (0.350mm-0.035mm), adding sodium dihydrogen phosphate solution containing 35% by weight of ethanol and water as a solvent and uniformly mixing to obtain a blank with certain plasticity. Such as figure 1 , Under the pressure of 10MPa, the burning synthetic material squeezes i...

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Abstract

The invention relates to a method of synthesizing the blast furnace protecting layer through the in-situ combustion. Its features is: pressing the material with strong reaction heating into the cavity, between 10MPa and 50MPa drying it for 2 hours at the temperature of 200deg.C to 300deg.C, lighting the reactant and synthesizing the protection layer. The materials with strong reaction heating composed of the mineral with chromium, reducing agent, thinner and inorganic salt, the reducing agent is 8% to 20%, the thinner is 0.1% to 50%, the inorganic salt is 1% to 5% and the rest is mineral with chromium. The lighting method is: connect the two tungsten filaments with the 220V binding posts of the transformer. The tungsten wires connect with the blank at the moment of powering on. The invention is simple technique, low cost, convenient construction field, long useful life and energy saving.

Description

technical field [0001] The invention belongs to the technical field of blast furnace tuyeres, and in particular provides a method for synthesizing inner and outer protective layers of blast furnace tuyeres by in-situ combustion, which is used for prolonging the service life of blast furnace tuyeres and energy saving of blast furnaces. technical background [0002] At present, there are various forms of tuyeres used on blast furnaces, and various corresponding manufacturing methods. In order to improve the wear resistance of the blast furnace tuyere and increase the life of the tuyere, people have made a lot of efforts. However, tuyere forms that take into account simple preparation, convenient use, prolonging the life of the tuyere, and remarkable energy-saving effects are rare. The following briefly introduces several tuyere forms and manufacturing methods closest to the present invention: [0003] 1. The tuyere body is made of red copper, and the tuyere with untreated in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/16
Inventor 张跃杨大正李健
Owner UNIV OF SCI & TECH BEIJING
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