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No-firing high purity magnesium calcium brick and preparation method therefor

A pure magnesia-calcium brick, high-purity technology, applied in the field of refractory materials, can solve the problems of affecting the atmospheric environment, natural gas explosion, high cost of natural gas, etc., achieve the effects of reducing impurity content, strong oxidation resistance, and prolonging the life of the furnace lining

Inactive Publication Date: 2017-06-20
孙光 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current preparation of magnesia-calcium bricks is mainly based on high-temperature sintering. Since the country advocates the use of clean energy to reduce environmental pollution, natural gas combustion is usually used to provide heat in the high-temperature sintering process of refractory materials, although it can reduce environmental pollution to a certain extent. , but will still produce a certain amount of greenhouse gases, affect the atmospheric environment, and there will be safety hazards such as natural gas explosions; at the same time, the cost of natural gas is relatively high, so it is necessary to develop a low-cost, energy-saving and emission-reducing Unfired high-purity magnesia-calcium bricks with superior performance are very necessary

Method used

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  • No-firing high purity magnesium calcium brick and preparation method therefor
  • No-firing high purity magnesium calcium brick and preparation method therefor
  • No-firing high purity magnesium calcium brick and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The raw materials were weighed according to the components specified in Table 1 below, and the preparation method was as follows.

[0038] (1) Weigh high-purity fused magnesia, sintered magnesia and magnesia-calcium sand according to parts by weight, put them into a crusher for crushing, and then add them to a ball mill for crushing, and then use a vibrating screen to screen out a particle size of Aggregate with a particle size of 100-150 mesh;

[0039] (2) Weigh high-purity fused magnesia powder, binder solid powder, rare earth oxide and ceramic sintering agent into a container by weight and mix them to form a powder;

[0040] (3) Mixing: Put the prepared aggregate into the mud mixer, add vitrified binder, the rotation speed is 50-60r / min, and the stirring time is 10-20 minutes. When stirring, add liquid binder until the vitrified binder is wrapped On the surface of the aggregate, add the powder prepared in the above step (2) and continue mixing and stirring for 20-30...

Embodiment 2

[0045] The method of Example 1 was repeated at the contents of each component specified in Table 1 below, and the test results are listed in Table 2. The unfired high-purity magnesia-calcium brick prepared in Example 2 was calcined at 1750° C. for 24 hours. Scanning electron micrographs of fractures of residual bricks after calcination are shown in 5 and Figure 6 shown.

Embodiment 3

[0047] The method of Example 1 was repeated at the contents of each component specified in Table 1 below, and the test results are listed in Table 2.

[0048] Table 1 Raw material ratio table of Examples 1-3 of the present invention.

[0049]

[0050] 1. Performance testing.

[0051] 1. Carry out scanning electron microscope to embodiment 2 of the present invention, the result is as follows Figures 1 to 6 shown.

[0052] The polishing scanning electron microscope figure ( Figure 7 and Figure 8 ) shown; the present invention randomly selects the non-fired high-purity magnesia-calcium bricks prepared in Example 2 for electron microscope scanning, as Figure 1-4 Shown; The unfired high-purity magnesia-calcium brick prepared in Example 2 was calcined at 1750° C. for 24 hours. Scanning electron micrographs of fractures of residual bricks after calcination are shown in 5 and Figure 6 show; combine Figure 1-8 It can be seen from the display that the scanning electron mi...

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Abstract

The invention belongs to the technical field of fireproofing materials for AOD, GOR, VOD and LF-VD refining furnace, specifically relates to a no-firing high purity magnesium calcium brick and the preparation method therefor. The brick consists of aggregate material, powder material and binder. The raw material of the aggregate material comprises the following compositions in parts by weight: 5 to 10 parts of high purity fused magnesite (>= 98% of magnesium oxide, with a critical particle size between 0.1 mm to 1 mm), 20 to 35 parts of sintered magnesite (>= 99% of magnesium oxide, with a critical particle size of 7 mm), 40 to 55 parts of calcium magnesite (the total content of magnesium oxide and calcium oxide is 98.5%, 40% to 45% of magnesium oxide and 50% to 55% of calcium oxide, with a critical particle size of 7 mm). The raw material of the powdered material comprises the following compositions in parts by weight: 15 to 20 parts of high purity fused magnesite (>= 98% of magnesium, with a particle size between 300 to 350 meshes), 1 to 4 parts of ceramic agglutinant (nanoscale particle size), 0.5 to 0.9 part of rare earth oxide (2000 to 3500 meshes of particle size). The binder comprises 0.5 to 1 part of solid powder binder and 1 to 3 parts of liquid binder. The no-firing high purity magnesium calcium brick and the preparation method therefor have the advantages of high purity, high intensity, good high temperature thermal shock resistance, strong corrosion resistance, molten metal resistance and oxidation resistance, no emissions of harmful gases, no need of high-temperature firing, low cost, and the like.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for AOD, GOR, VOD and LF-VD refining furnaces, and in particular relates to a non-fired high-purity magnesia-calcium brick and a preparation method thereof. Background technique [0002] Magnesium-calcium refractory is a kind of basic refractory material, which has been used as the lining material of steelmaking converter since the early 1960s, and has contributed to the development of my country's steelmaking industry. At present, it has been widely applied to refining equipment of high-grade steel such as stainless steel and clean steel, and is developing at a relatively fast speed, especially in the application of AOD, GOR, VOD and LF-VD refining furnaces. Magnesia-calcium refractories are mainly fired magnesia-calcium bricks. The reason why magnesia-calcium bricks can replace magnesia-chrome bricks as the main lining material for AOD furnaces is that they can purify molten steel, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
Inventor 孙光郭全营
Owner 孙光
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