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A raw material for the preparation of magnesia-iron bricks capable of improving the high-temperature flexural strength of magnesia-iron bricks and a preparation process for magnesia-iron bricks

A technology of flexural strength and magnesia iron bricks is applied in the field of preparing raw materials of magnesia iron bricks, which can solve the problems of unsuitability of magnesia-alumina spinel bricks, damage to the brick body structure, unfavorable hanging kiln skin, etc. The effect of low rate and few kinds of raw materials

Active Publication Date: 2017-04-12
PUYANG REFRACTORIES GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, free Al 2 o 3 It is not conducive to hanging the kiln skin, and the magnesium aluminum spinel is afraid of CaO / SiO 2 Relatively high silicate (C 3 S, C 2 S) and C 4 AF, the eutectics formed between them are all low-melting compounds, the kiln skin will burn and collapse, and the brick structure will also be damaged due to the erosion of spinel
This is also the main reason why magnesia-aluminum spinel bricks are not suitable for use in the firing zone of cement kilns

Method used

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  • A raw material for the preparation of magnesia-iron bricks capable of improving the high-temperature flexural strength of magnesia-iron bricks and a preparation process for magnesia-iron bricks
  • A raw material for the preparation of magnesia-iron bricks capable of improving the high-temperature flexural strength of magnesia-iron bricks and a preparation process for magnesia-iron bricks
  • A raw material for the preparation of magnesia-iron bricks capable of improving the high-temperature flexural strength of magnesia-iron bricks and a preparation process for magnesia-iron bricks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A magnesia-iron brick preparation raw material capable of improving the high-temperature flexural strength of magnesia-iron bricks. The magnesia-iron brick preparation raw material consists of the following components:

[0035] High-purity magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 5 mm and greater than 3 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 18 wt %;

[0036] High-purity magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 3 mm and greater than 1 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 21 wt %;

[0037] High-purity magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 1 mm and greater than 0.088 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 20 wt%;

[0038] The mass percentage of MgO ...

Embodiment 2

[0045] A magnesia-iron brick preparation raw material capable of improving the high-temperature flexural strength of magnesia-iron bricks. The magnesia-iron brick preparation raw material consists of the following components:

[0046] High-purity magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 5 mm and greater than 3 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 15 wt %;

[0047] High-purity magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 3 mm and greater than 1 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 32 wt %;

[0048] High-purity magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 1 mm and greater than 0.088 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 13 wt %;

[0049] The mass percentage of MgO...

Embodiment 3

[0056] A magnesia-iron brick preparation raw material capable of improving the high-temperature flexural strength of magnesia-iron bricks. The magnesia-iron brick preparation raw material consists of the following components:

[0057] High-purity magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 5 mm and greater than 3 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 15 wt %;

[0058] High-purity magnesia with a mass percentage of MgO of 97% by weight and a particle size of less than or equal to 3mm and greater than 1mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 30% by weight;

[0059] Fused magnesia with a mass percentage of MgO of 97 wt% and a particle size of less than or equal to 1 mm and greater than 0.088 mm, whose mass percentage in the raw materials for the preparation of magnesia-iron bricks is 14 wt%;

[0060] The mass percentage of...

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Abstract

The invention discloses a magnesium-iron brick preparation raw material capable of increasing the high temperature bending strength of a magnesium-iron brick and a magnesium-iron brick preparation process. The magnesium-iron brick preparation raw material contains magnesium-iron sand, wherein the magnesium-iron sand comprises the following components in percentage by mass: 20wt%-70wt% of MgO, 30wt%-80wt% of Fe2O3 and impurities which are less than or equal to 2wt%. The magnesium-iron brick and magnesium-iron brick preparation process comprises the following steps: (a) weighing each component in percentage by mass in the magnesium-iron brick preparation raw material; (2) adding materials with the particle sizes larger than 0.088mm into a mixing mill, mixing for 1-2 minutes, adding waste paper pulp, mixing for 3-4 minutes, adding materials with the particle sizes smaller than or equal to 0.088mm, and mixing for 3-4 minutes; and (3) weighing the mixed materials, adding the mixed materials into a mold, and producing the mixed materials into a brick blank by virtue of a friction pressure machine or a hydraulic pressure machine, and after drying at 110-120 DEG C for 24 hours, sintering at a high temperature of 1520-1610 DEG C, so as to obtain the magnesium-iron brick. According to the magnesium-iron brick preparation raw material, the high temperature bending strength of the magnesium-iron brick can be substantially improved, and the adverse effect caused by Al2O3 to a brick body can be greatly weakened.

Description

technical field [0001] The invention relates to the technical field of production and application of refractory materials, in particular to a raw material for preparing magnesia-iron bricks that can improve the high-temperature flexural strength of magnesia-iron bricks. Background technique [0002] The bricks used in the firing zone of cement rotary kiln have gone through high-alumina bricks, magnesia-chrome bricks, magnesia-alumina bricks, magnesia-alumina spinel bricks, and now magnesia-alumina-iron-spinel bricks. Due to the enhancement of people's awareness of environmental protection, magnesia-chrome bricks have gradually withdrawn from the market. With the increase of kiln diameter and operating speed, the working conditions in the kiln become more severe, and refractory materials with better performance are bound to be required. Due to good kiln skin hanging performance and thermal shock resistance, magnesia-aluminum-iron-spinel bricks have been commonly used in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 廖玉超刘百宽王新超范青松何自战孙荣海
Owner PUYANG REFRACTORIES GRP CO LTD
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