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Magnesium dolomite brick

A magnesia dolomite brick and clinker technology, applied in the field of refractory bricks, can solve the problems affecting brick durability, inconsistent thermal expansion rate, peeling cracks, etc., achieve small plastic deformation, high liquid phase viscosity, and strong shear stress resistance Effect

Inactive Publication Date: 2008-09-17
张建涛 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, magnesia-chrome bricks and magnesia-carbon bricks are generally used in this field. All kilns using magnesia-chrome bricks are likely to cause environmental pollution because of chromium, which has long been banned internationally.
The main defects of magnesia-chrome bricks: ①The resistance to steel slag corrosion mainly depends on the amount of chrome ore added, but the more chrome ore is added, the more impurities that are brought into the brick, that is, the more low-melting material, which will seriously affect the durability of the brick
②Because the thermal expansion rates of chromium and magnesium are inconsistent, cracks will occur during the sintering process, and it is easy to cause peeling or crack aggravation in application
The main defects of magnesia-carbon bricks: ①If low-carbon steel or carbon-free steel is smelted, the carbon in magnesia-carbon bricks will pollute the molten steel, so the ladle lining needs to be coexisted by magnesia-dolomite bricks or magnesia bricks in the temperature range, And the weight loss is small in Ar gas and vacuum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Take Chengdu Bojiang Special Steel Plant (magnesia dolomite bricks are used in the refining furnace VOD furnace of this steel plant).

[0058] The weight ratio of chemical composition of magnesium dolomite brick is:

[0059] Mg≥48%, Cao33%, Al 2 o 3 ≤2.9%, SiO 2 ≥12%, Fe 2 o 3 ≤2.5%.

[0060] The production process of magnesia dolomite brick is:

[0061] The first step is to select 12 tons of non-hydrating and high-temperature-resistant finished clinker. The finished clinker (natural dolomite) is calcined at a temperature above 1650°C until it is cooked;

[0062] The second step is to crush the clinker with a pulverizer;

[0063] The third step is to pass the broken clinker through different sieves to screen out different particles. The particles are: 5-3mm accounts for 15%, 3-1mm accounts for 35%, 1-0mm accounts for 20%, 0.088 mm accounted for 25%;

[0064] The fourth step is to mix the above particles in proportion, and stir them evenly with a mixer to make m...

Embodiment 2

[0070] The use of Panzhihua Iron and Steel Group's special steel plant (magnesia dolomite bricks are used in the 30-ton tundish-lined AOD furnace of the Group's steelmaking plant).

[0071] The weight ratio of chemical composition of magnesium dolomite brick is:

[0072] Mg≥48%, Cao33%, Al 2 o 3 ≤2.9%, SiO 2 ≥12%, Fe 2 o 3 ≤2.5%

[0073] The production process of magnesia dolomite brick is:

[0074] The first step, select 10 tons of non-hydrating, high-temperature-resistant finished clinker, and the finished clinker (to get natural dolomite) is calcined, and its temperature is above 1650 ° C until it is cooked;

[0075] The second step is to crush the clinker with a pulverizer;

[0076] The third step is to pass the broken clinker through different sieves to screen out different particles. The particles are: 15% of 5-3mm, 35% of 3-1mm, 20% of 1-0mm, 0.088mm accounted for 25%;

[0077] The fourth step is to mix the above particles in proportion, and stir them evenly wi...

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Abstract

The invention provides a magnesite dolomite brick used in the fields of steel plant, non-ferrous smelting industry and building material industry. The magnesium dolomite brick contains the following chemical components in weight percentages: more than or equal to 48% of Mg, 33% of CaO, less than or equal to 2.9% of Al2O3, more than or equal to 12% of SiO2, and less than or equal to2.5 % of Fe2O3. The final product (natural dolomite) is obtained by crushing, sieving, mixing, stirring, adding binders, homogenizing, drying and sintering at a temperature more than or equal to 1700 DEG C. The product is inactive to hydration and is stable for storage without oil immersion or wax immersion treatment or sealed package, and is a new product developed from local dolomite resource. The product has the advantages of high CaO content, inactivity to hydration, high melting point, high refractoriness under load, good fire resistance, less plastic deformation at high temperature, good stability to heat and shock, large crystallization strength, good resistance to shear stress, slag corrosion and erosion, and strong chemical stability to alkaline steel slag and iron-containing furnace slag. The magnesium dolomite brick is used as substitute for magnesia-chromite brick and magnesia carbon brick.

Description

Technical field: [0001] The invention relates to a refractory brick used in the fields of steelmaking, non-ferrous smelting and building materials, especially a magnesia-dolomite brick, which fills the gap in this field in China and is also the most ideal substitute for magnesia-chrome bricks and magnesia-carbon bricks of new varieties. Background technique: [0002] At present, magnesia-chrome bricks and magnesia-carbon bricks are generally used in this field. All kilns using magnesia-chrome bricks are likely to cause environmental pollution because of chromium, which has long been banned internationally. The main defects of magnesia-chrome bricks: ①The resistance to steel slag corrosion mainly depends on the amount of chrome ore added, but the more chrome ore is added, the more impurities that are brought into the brick, that is, the more low-melting material, which will seriously affect the durability of the brick. ②Because the thermal expansion rates of chromium and mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/04
Inventor 张建涛李满涛
Owner 张建涛
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