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Composite magnesia-calcium brick with low thermal conductivity and high performance and manufacturing method thereof

A technology of composite magnesia-calcium bricks and low thermal conductivity, which is applied in the field of refractory materials for stainless steel smelting furnaces, can solve problems such as difficult recycling, waste of high-quality refractory raw materials, waste magnesia-calcium bricks, etc., to improve resource utilization and reduce Effects of thermal conductivity and strengthening matrix strength

Active Publication Date: 2014-10-22
LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. With the wide application of magnesia-calcium bricks, a large amount of waste magnesia-calcium bricks will inevitably be produced
The amount of residual bricks after disassembly is large, and it is not easy to recycle and reuse, which not only causes waste of resources, but also pollutes the environment
In addition, the current magnesia-calcium brick production enterprises all adopt one-stage overall manufacturing, which is also a waste of high-quality refractory raw materials used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A composite magnesia-calcium brick with low thermal conductivity and high performance, which is made by pressing the non-working end and the working end, wherein the non-working end is made of the following raw materials in proportion by weight:

[0040] 5mm~2mm 20 magnesia calcium sand 15 parts,

[0041] 2mm~0mm 20 magnesia calcium sand 9 parts,

[0042] ≤ 0.088mm 20 magnesium calcium sand 8 parts,

[0043] 5mm~2mm waste magnesia calcium brick sand 30 parts,

[0044] 2mm~0mm waste magnesia calcium brick sand 18 parts,

[0045] ≤ 0.088mm 95 mid-grade magnesia powder 10 parts,

[0046] ≤ 0.045mm Dolomite powder 5 parts,

[0047] ≤ 0.045mm lightly burned magnesia powder 5 parts,

[0048] Paraffin 2~5 parts,

[0049] The working end is made of the following raw materials in proportion by weight:

[0050] 10mm~5mm 55 magnesia calcium sand 5 parts,

[0051] 5mm~2mm 55 magnesia calcium sand 30 parts,

[0052] 20 parts of 2mm~0mm 55 magnesium calcium sand,

[0053] 1...

Embodiment 2

[0068] A composite magnesia-calcium brick with low thermal conductivity and high performance, which is made by pressing the non-working end and the working end, wherein the non-working end is made of the following raw materials in proportion by weight:

[0069] 5mm~2mm 20 magnesia calcium sand 12 parts,

[0070] 2mm~0mm 20 magnesia calcium sand 6 parts,

[0071] ≤ 0.088mm 20 magnesium calcium sand 14 parts,

[0072] 33 parts of 5mm~2mm discarded magnesia-calcium brick sand,

[0073] 21 parts of 2mm~0mm waste magnesia calcium brick sand,

[0074] ≤ 0.088mm 95 mid-grade magnesia powder 8 parts,

[0075] ≤ 0.045mm Dolomite powder 3 parts,

[0076] ≤ 0.045mm lightly burned magnesia powder 3 parts,

[0077] 2~5 parts of paraffin.

[0078] The technical solution of the working end is the same as that of the working end described in Embodiment 1.

[0079] The manufacturing process steps are the same as those described in Example 1.

Embodiment 3

[0081] A composite magnesia-calcium brick with low thermal conductivity and high performance, which is made by pressing the non-working end and the working end, wherein the non-working end is made of the following raw materials in proportion by weight:

[0082] 5mm~2mm 20 magnesia calcium sand 9 parts,

[0083] 2mm~0mm 20 magnesia calcium sand 3 parts,

[0084] ≤ 0.088mm 20 magnesia calcium sand 20 parts,

[0085] 5mm~2mm waste magnesia calcium brick sand 36 parts,

[0086] 24 parts of 2mm~0mm waste magnesia-calcium brick sand,

[0087] ≤ 0.088mm 95 mid-grade magnesia powder 6 parts,

[0088] ≤ 0.045mm Dolomite powder 1 part,

[0089] ≤ 0.045mm lightly burned magnesia powder 1 part,

[0090] 2~5 parts of paraffin.

[0091] The technical solution of the working end is the same as that of the working end described in Embodiment 1.

[0092] The manufacturing process steps are the same as those described in Example 1.

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Abstract

The invention provides a composite magnesium-calcium brick having low heat conductivity and high service performance and a manufacturing method thereof. The method comprises the following process steps: (1) dividing the die cavity of a brick press into a working end die cavity and a non-working end die cavity by using a serrate separation plate, mixing mud according to two technical schemes, adding into the corresponding die cavity, drawing out the separation plate, and forming; and the method comprises the following technical schemes: (2) the technical scheme of the non-working end is composed of the following raw materials: waste magnesium-calcium brick sand, 20 magnesium-calcium sand, 95 middle-grade magnesium sand powder, dolomite powder, light-burned magnesium oxide powder and binder. The non-working end and the working end are respectively prepared through the procedures such as compounding, forming, burning and the like. On the premise of not lowering the service performance of the working end, the magnesium-calcium brick prepared according to the technical schemes of the invention reasonably increases the utilization ratio of waste magnesium-calcium bricks, saves raw material resources, reduces the heat conductivity and effectively lowers the heat loss in the service process.

Description

technical field [0001] The invention relates to a composite magnesia-calcium brick with low thermal conductivity and high performance and a manufacturing method thereof, belonging to the technical field of refractory materials for stainless steel smelting furnaces. Background technique [0002] In recent years, with the development of stainless steel, my country has become the largest producer and consumer of stainless steel in the world. Although it has greatly promoted the development of magnesium-calcium refractory materials, technological progress and its consumption, it has also brought A few main questions: [0003] 1. Stainless steel has entered a state of overcapacity. In addition to the bad international economic environment in recent years, the competition among stainless steel manufacturers has been fierce, so they have to reduce production costs. This forces refractory manufacturers to reduce production costs while ensuring product quality. [0004] 2. With the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 苏广深杨永刚
Owner LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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