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Magnesium binding agent for cement-free castable and preparation method thereof

A magnesia binder and castable technology, applied in the field of unshaped refractory materials, can solve the problems of high water addition, difficult film release, low mold release strength, etc., improve refractoriness and high temperature performance, solve storage and transportation difficulties, The effect of improving corrosion resistance

Active Publication Date: 2020-01-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high specific surface area of ​​hydrated alumina, the castable requires a high amount of water and a long stirring time, and the HA-bonded castable has low permeability after hardening, which makes the castable easy to burst during the dehydration process
Silica sol-bonded castables are difficult to release due to low release strength, and adding silica sol to castables will introduce SiO into the system 2 , thereby affecting the high-temperature performance of the material
The phosphate binder decomposes and volatilizes harmful gases during use (P 2 o 5 ) will corrode equipment and pollute the environment
[0004] The existing amide binder for cementless castables (CN 102417319 A) provides an amide binder suitable for high alumina, corundum, and silicon nitride cementless castables. releases harmful gases (NH 3 )
A binder for magnesia refractory castables (CN 102515805 A) patent technology proposes a binder for magnesia refractory castables; the binder is composed of magnesium chloride hexahydrate and a coagulant, and the coagulant is lightly burned magnesium It is composed of sand powder and active magnesium oxide powder, but the hydration of magnesium oxide in the binder will cause large volume expansion, which may cause cracks in the castable green body. The document "MgO fumes as a potential binder for in situ spine containing refractory castables" points out Use light-burned magnesia powder as binder, light-burned magnesia powder has high specific surface area and activity so that the castable has high green strength, but this kind of binder must strictly control the amount of magnesia anti-hydration agent , otherwise it will also cause cracks in the castable green body

Method used

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  • Magnesium binding agent for cement-free castable and preparation method thereof
  • Magnesium binding agent for cement-free castable and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Tabular alumina aggregate with a particle size of less than 5 mm and greater than or equal to 3 mm, the content of tabular alumina is 35%, the content of tabular alumina with a particle size of less than 3 mm and greater than or equal to 1 mm is 17%, and the particle size is less than 1 mm and greater than or equal to 74 μm. The content of corundum is 20%, the particle size is 14wt% of tabular corundum fine powder with a particle size of less than 45 μm, and the active α-Al 2 o 3 Micropowder 9wt%, magnesium citrate binder 5wt%.

[0030] After the above raw materials are mixed evenly, the amount of water added is 6%, and the cement-free refractory castable is prepared. After testing, the flexural strength after baking at 110°C is 10.8MPa, and the compressive strength is 48.6MPa.

[0031] From attached figure 1 It can be seen that the magnesium citrate binder will form a network structure and have coagulation properties when it is stirred with water. From figure 2 It...

Embodiment 2

[0033] Same as Example 1, the difference is that the proportioning of raw materials and the amount of water added are different, and the present embodiment weighs each component according to the following mass percentages:

[0034] The content of platy corundum aggregate with a particle size of less than 8mm and greater than or equal to 5mm is 25%, the content of platy corundum with a particle diameter of less than 5mm and greater than or equal to 3mm is 10%, and the content of platy corundum with a particle diameter of less than 3mm and greater than or equal to 1mm is 17%, the content of tabular alumina with a particle size of less than 1mm and greater than or equal to 74μm is 20%, the tabular corundum fine powder with a particle size of less than 45μm is 14wt%, silicon micropowder is 1wt%, active α-Al2O3 micropowder is 8wt%, magnesium citrate The content of binder is 5wt%.

[0035] After the above raw materials are mixed evenly, the amount of water added is 5.8%, and the cem...

Embodiment 3

[0037] Same as Example 1, the difference is that the proportioning of raw materials and the amount of water added are different, and the present embodiment weighs each component by the following mass percentages:

[0038] The content of platy corundum aggregate with a particle size of less than 8mm and greater than or equal to 5mm is 25%, the content of platy corundum with a particle diameter of less than 5mm and greater than or equal to 3mm is 10%, and the content of platy corundum with a particle diameter of less than 3mm and greater than or equal to 1mm is 17%, the content of tabular alumina with a particle size of less than 1mm and greater than or equal to 74μm is 20%, the content of tabular corundum fine powder with a particle size of less than 45μm is 14wt%, silicon micropowder 1wt%, active α-Al 2 o 3 Micropowder 8wt%, magnesium citrate binder 4wt%, magnesia 1wt%.

[0039]After mixing the above raw materials evenly, add 5.6% of water to prepare a cement-free refractory ...

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Abstract

The invention discloses a magnesium binding agent for cement-free castable and a preparation method thereof. The preparation method comprises the following steps: baking a magnesium raw material containing crystal water at a high temperature to remove the crystal water, and then grinding and sieving to obtain the magnesium binding agent, wherein the magnesium raw material can be any one of magnesium citrate, magnesium oxalate, magnesium gluconate and the like, the high temperature is 100-400 DEG C, and the baking time is 1-200 hours. The magnesium binding agent can form a net-shaped structureand has coagulation performance when being added with water and stirred, a refractory castable prepared from the magnesium binding agent has excellent normal-temperature mechanical performance, and spinel generated in situ at high temperature can improve the erosion resistance and thermal shock resistance of the castable; the binding agent has the advantages of no environmental pollution, simple production process, low production energy consumption and the like, is wide in application range, and is suitable for high-alumina, corundum, silicon carbide and other cement-free castables.

Description

technical field [0001] The invention belongs to the technical field of unshaped refractory materials, and in particular relates to a magnesium binder for cementless castables and a preparation method thereof. Background technique [0002] Refractory castable is a typical unshaped refractory material. Binder is an important part of refractory castables, and the construction performance, drying performance and serviceability of refractory castables largely depend on their bonding system. Calcium aluminate cement (CAC) has become the most widely used binder because of its good rheological characteristics and green strength. However, CaO in cement will cause refractory materials to form anorthite at high temperatures, and calcium aluminum yellow grows Low melting point phases such as limestone and tricalcium aluminate reduce the high-temperature performance of refractory castables (refractoriness, thermal shock resistance, erosion resistance and high-temperature flexural streng...

Claims

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Application Information

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IPC IPC(8): C04B35/632C04B35/101
CPCC04B35/101C04B35/632C04B2235/3206C04B2235/3418C04B2235/449C04B2235/96
Inventor 肖国庆陈建军丁冬海任耘
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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