Magnesium-chromium high-temperature ceramic soldering material and preparation method thereof

Abstract

The invention provides a magnesium-chromium high-temperature ceramic soldering material which comprises the following components by weight percent: 44-46% of MgO, 14-16% of Cr2O3, 24-27% of Al2O3 and 14-16% of CaO, wherein the MgO is selected from one or more of fused magnesia, konite, magnesite-chrome spinel and MgO-CaO clinker; Cr2O3 is selected from one or more of chromium concentrate, chromite, magnesite-chrome spinel and chrome corundum; Al2O3 is selected from one or more of metal aluminum powder and chrome corundum; and CaO is selected from one or more of konite, MgO-CaO clinker and fused magnesia. The invention relates to a related preparation method. By using the magnesium-chromium high-temperature ceramic soldering material, the difficult problem that a furnace formed from magnesium refractory materials can not be soldered and maintained by using the existing silicon and high-temperature zirconia mullite ceramic welding feed supplement is solved, the service life of an industrial furnace is prolonged, the use cost of the industrial furnace is reduced, and the loss brought by damage of the industrial furnace is reduced, thus the magnesium-chromium high-temperature ceramic soldering material is suitable for large-scale popularization and application.

Description

technical field

[0001] The present invention relates to the technical field of industrial kilns, more specifically, to the technical field of repairing industrial kilns, in particular to a magnesia-chromium high-temperature ceramic welding repair material used for refining and repairing glass kilns, sleeve lime kilns, and RH furnaces . Background technique

[0002] At present, various industrial furnaces play a fundamental role in the steel, glass, lime and other industries. However, after various industrial furnaces have been in service for a period of time, the furnace lining made of refractory materials will be damaged to varying degrees, which directly affects the life of the furnace. In particular, the large local damage cannot be repaired by conventional methods such as masonry and spraying, which leads to the forced shutdown of the furnace and kiln, resulting in huge economic losses.

[0003] High-temperature ceramic welding repair technology is a brand-new method o...

Examples

Embodiment 1

[0021] Example 1 Preparation of magnesia-chrome high-temperature ceramic welding filler material

[0022] 20% (weight) of fused magnesia, 11% (weight) of magnesia dolomite, 10% (weight) of magnesia-chrome spinel, 25% (weight) of magnesia-calcium sand, 9% (weight) of Chromium concentrate, 3% (by weight) of chromite, 5% (by weight) of chrome corundum, and 12% (by weight) of aluminum powder are mixed and stirred evenly to form the magnesia-chromium high-temperature ceramic soldering material 1 .

[0023] 20% (weight) of fused magnesia, 11% (weight) of magnesia dolomite, 10% (weight) of magnesia-chrome spinel, 25% (weight) of magnesia-calcium sand, 10% (weight) of Chromium concentrate, 4% (by weight) of chromite, 6% (by weight) of chrome corundum, and 13% (by weight) of metal aluminum powder are mixed and stirred evenly to form the magnesia-chrome high-temperature ceramic welding material 2 .

[0024] 21% (weight) of fused magnesia, 11% (weight) of magnesia dolomite, 10% (weight)...

Embodiment 2

[0026] Example 2 Repair test of magnesia-chromium high-temperature ceramic welding material

[0027] The magnesia-chromium high-temperature ceramic welding filling materials 1-4 prepared in Example 1 are respectively repaired to industrial furnaces and kilns with damages of the same size. Under the action of flow, it is sprayed from the welding torch to the damaged part of the industrial kiln. In the damaged part, the fuel particles of the magnesia-chromium high-temperature ceramic welding material burn to generate high temperature, and the refractory material of the magnesia-chromium high-temperature ceramic welding material is The particles and the refractory material at the damaged part are softened and melted, so that the damaged part is firmly welded with the refractory material of the magnesia-chromium high-temperature ceramic welding filler, and the purpose of repairing the kiln is achieved. After measurement, the restorations all meet the following indicators:

[0028...

technical field

[0001] The present invention relates to the technical field of industrial kilns, more specifically, to the technical field of repairing industrial kilns, in particular to a magnesia-chromium high-temperature ceramic welding repair material used for refining and repairing glass kilns, sleeve lime kilns, and RH furnaces . Background technique

[0002] At present, various industrial furnaces play a fundamental role in the steel, glass, lime and other industries. However, after various industrial furnaces have been in service for a period of time, the furnace lining made of refractory materials will be damaged to varying degrees, which directly affects the life of the furnace. In particular, the large local damage cannot be repaired by conventional methods such as masonry and spraying, which leads to the forced shutdown of the furnace and kiln, resulting in huge economic losses.

[0003] High-temperature ceramic welding repair technology is a brand-new method o...

Examples

Embodiment 1

[0021] Example 1 Preparation of magnesia-chrome high-temperature ceramic welding filler material

[0022] 20% (weight) of fused magnesia, 11% (weight) of magnesia dolomite, 10% (weight) of magnesia-chrome spinel, 25% (weight) of magnesia-calcium sand, 9% (weight) of Chromium concentrate, 3% (by weight) of chromite, 5% (by weight) of chrome corundum, and 12% (by weight) of aluminum powder are mixed and stirred evenly to form the magnesia-chromium high-temperature ceramic soldering material 1 .

[0023] 20% (weight) of fused magnesia, 11% (weight) of magnesia dolomite, 10% (weight) of magnesia-chrome spinel, 25% (weight) of magnesia-calcium sand, 10% (weight) of Chromium concentrate, 4% (by weight) of chromite, 6% (by weight) of chrome corundum, and 13% (by weight) of metal aluminum powder are mixed and stirred evenly to form the magnesia-chrome high-temperature ceramic welding material 2 .

[0024] 21% (weight) of fused magnesia, 11% (weight) of magnesia dolomite, 10% (weight)...

Embodiment 2

[0026] Example 2 Repair test of magnesia-chromium high-temperature ceramic welding material

[0027] The magnesia-chromium high-temperature ceramic welding filling materials 1-4 prepared in Example 1 are respectively repaired to industrial furnaces and kilns with damages of the same size. Under the action of flow, it is sprayed from the welding torch to the damaged part of the industrial kiln. In the damaged part, the fuel particles of the magnesia-chromium high-temperature ceramic welding material burn to generate high temperature, and the refractory material of the magnesia-chromium high-temperature ceramic welding material is The particles and the refractory material at the damaged part are softened and melted, so that the damaged part is firmly welded with the refractory material of the magnesia-chromium high-temperature ceramic welding filler, and the purpose of repairing the kiln is achieved. After measurement, the restorations all meet the following indicators:

[0028...

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