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Hydration-resistant magnesia chrome castable for nonferrous metallurgical furnaces and preparation method thereof

A technology for waterproofing and castables, applied in the field of non-ferrous metallurgical refractories, can solve the problems of low strength and short shelf life, and achieve the effect of high strength

Inactive Publication Date: 2016-11-30
郴州市恒达环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first technical problem to be solved by the present invention is to provide a special waterproof magnesium-chromium castable for non-ferrous metallurgical furnaces, which solves the problems of short shelf life of magnesium-chromium castables in the actual use process, easy hydration expansion and low temperature in the pouring process. The disadvantage of low service strength under certain conditions lays the foundation for the large-scale use of magnesium-chromium castables

Method used

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  • Hydration-resistant magnesia chrome castable for nonferrous metallurgical furnaces and preparation method thereof
  • Hydration-resistant magnesia chrome castable for nonferrous metallurgical furnaces and preparation method thereof
  • Hydration-resistant magnesia chrome castable for nonferrous metallurgical furnaces and preparation method thereof

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preparation example Construction

[0021] Further, the present invention also provides a preparation method of the above-mentioned waterproof magnesium-chromium castable for non-ferrous metallurgical furnaces, the preparation method comprising the following steps:

[0022] 1) Breaking the magnesia-chrome block material to prepare magnesia-chrome pellets, and then classifying the pellets into magnesia-chrome sands with a particle size of 5-8mm, 3-5mm, 1-3mm and 0-1mm for later use;

[0023] 2) Select a part of magnesia-chromium sand with a particle size of 0-1 mm to prepare magnesia-chrome fine powder, add stearic acid accounting for 0.5-2% of the mass fraction, and grind it with a ball mill or Raymond machine until the particle size is 160-200 mesh;

[0024] 3) Take 15 parts of magnesia chrome sand with a particle size of 5-8 mm, 10 parts of magnesia chrome sand with a particle size of 3-5 mm, 10-15 parts of magnesia chrome sand with a particle size of 1-3 mm, magnesia-chrome fine powder and a particle size of ...

Embodiment 1

[0031] The fused magnesia-chrome block material is crushed by a crusher and then classified into magnesia-chrome sands with particle sizes of 5-8mm, 3-5mm, 1-3mm and 0-1mm, and 0.5% stearin is added to some 0-1mm magnesia-chrome sands The acid is ground into a 180-mesh fine powder by a ball mill for later use; the special waterproof magnesium-chromium castable for non-ferrous metallurgical kilns is made according to the following mass ratio:

[0032]

[0033] Put the components except potassium carbonate in a blender and stir them evenly, then pack them into 25 kg packaging bags. The potassium carbonate in the package is first dissolved in an appropriate amount of tap water, stirred together with the mixture in the large packaging bag, then poured into the part to be poured, and shaken to shape.

Embodiment 2

[0035]Recycled magnesia-chrome bricks are crushed by a crusher and classified into 5-8mm, 3-5mm, 1-3mm and 0-1mm granular magnesia-chrome sand, and a part of 0-1mm magnesia-chrome sand is selected and added with 2% stearic acid and ground by a ball mill. 180-mesh fine powder for use; special waterproof magnesium-chromium castable for non-ferrous metallurgical furnaces is made according to the following mass ratio:

[0036]

[0037]

[0038] Put the components except potassium carbonate in a blender and stir them evenly, then put them into 25 kg packaging bags. Potassium carbonate is packaged in a separate small package and packed together. The potassium carbonate in the package is first dissolved in an appropriate amount of tap water, stirred together with the mixture in the large packaging bag, then poured into the part to be poured, and shaken to shape.

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Abstract

The invention discloses a hydration-resistant magnesia chrome castable for nonferrous metallurgical furnaces and a preparation method thereof, and belongs to the technical field of nonferrous metallurgical refractory materials. Raw materials of the castable contain magnesia chrome particles, a hydration-resistant matrix and a hydration-resistant low-temperature sintering aid. The magnesia chrome particles contain, by weight, 15 parts of magnesia chrome sand with particle size being 5-8 mm, 10 parts of magnesia chrome sand with particle size being 3-5 mm, 10-15 parts of magnesia chrome sand with particle size being 1-3 mm, and 30-35 parts of magnesia chrome fine-powder and magnesia chrome sand with particle size being 0-1 mm. The hydration-resistant low-temperature sintering aid is potassium carbonate, which accounts for 0.3-1.0% of mass of the magnesia chrome particles. The magnesia chrome fine-powder is coated with stearic acid. Problems of magnesia chrome castable, such as short storage life in actual use process, easy hydration and swelling in casting process and low service strength at low temperature, are solved. The invention lays a foundation for large-scale use of the magnesia chrome castable.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy refractory materials, and in particular relates to a special waterproof magnesium castable for nonferrous metallurgy and a preparation method thereof. Background technique [0002] There are many kinds of non-ferrous metals, and the smelting methods are various. Although the non-ferrous metal industry has some special requirements for refractory materials, due to the small amount of refractory materials used (about 4% of the total output of refractory materials), there is not enough attention, research and reports. The major consumers of refractory materials in the non-ferrous metal industry are copper, nickel, tin, lead, zinc smelting furnaces and aluminum smelting industries. At present, a large number of magnesia-chrome refractory bricks are used. The production of refractory bricks is limited due to the large amount of energy consumed and flue gas emissions. . Because of its su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 刘晓明王家邦
Owner 郴州市恒达环保科技有限公司
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