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Sintered high-alumina refractory brick and preparation method thereof

A refractory brick and high-alumina technology, which is applied in the field of high-alumina refractory bricks, can solve the problems affecting the high-temperature strength and slag erosion resistance of fired high-alumina refractory materials, so as to improve the high-temperature strength and slag erosion resistance, The effect of simple preparation process and low cost

Active Publication Date: 2017-09-08
淄博恒森耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fired high-alumina refractories prepared by this technology have low firing temperature, energy saving and environmental protection, wide source of raw materials and low cost, this technology uses sodium salts (sodium tripolyphosphate, sodium carbonate and sodium silicate) as binders , Yi with Al 2 o 3 Low melting phase is formed at high temperature, which seriously affects the high-temperature strength and slag erosion resistance of fired high-alumina refractory materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A fired high-alumina refractory brick and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0034] In the first step, high alumina bauxite is added to a planetary forced mixer and kneaded for 3 to 5 minutes, and sieved to obtain material A with a particle size of 3 to 5 mm.

[0035] In the second step, add ferro-titanium slag into a planetary forced mixer and knead for 5-8 minutes, and sieve to obtain material B with a particle size of 0.088-2.5 mm.

[0036] The third step, according to the mass ratio of the material A: the material B: Guangxi white clay: silicon carbide: ρ-alumina is 1: (0.75~0.77): (0.05~0.07): (0.25~0.27): (0.30~0.32), adding the material A, the material B, the Guangxi white mud, the silicon carbide and the ρ-alumina into a mixer, stirring for 8-10 minutes to prepare a premix.

[0037] Step 4: adding silica sol accounting for 5-5.4 wt% of the premix to the premix, stirring for 3-5 minutes, and tra...

Embodiment 2

[0041] A fired high-alumina refractory brick and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0042] In the first step, high alumina bauxite is added to a planetary forced mixer and kneaded for 3 to 5 minutes, and sieved to obtain material A with a particle size of 3 to 5 mm.

[0043] In the second step, add ferro-titanium slag into a planetary forced mixer and knead for 5-8 minutes, and sieve to obtain material B with a particle size of 0.088-2.5 mm.

[0044] The third step, according to the mass ratio of the material A: the material B: Guangxi white clay: silicon carbide: ρ-alumina is 1: (0.76~0.78): (0.06~0.08): (0.26~0.28): (0.31~0.33), adding the material A, the material B, the Guangxi white mud, the silicon carbide and the rho-alumina into a mixer, stirring for 8-10 minutes to prepare a premix.

[0045]Step 4: Add silica sol accounting for 5.2-5.6 wt% of the premix to the premix, stir for 3-5 minutes, and trap th...

Embodiment 3

[0049] A fired high-alumina refractory brick and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0050] In the first step, high alumina bauxite is added to a planetary forced mixer and kneaded for 3 to 5 minutes, and sieved to obtain material A with a particle size of 3 to 5 mm.

[0051] In the second step, add ferro-titanium slag into a planetary forced mixer and knead for 5-8 minutes, and sieve to obtain material B with a particle size of 0.088-2.5 mm.

[0052] The third step, according to the mass ratio of the material A: the material B: Guangxi white clay: silicon carbide: ρ-alumina is 1: (0.77~0.79): (0.07~0.09): (0.27~0.29): (0.32~0.34), adding the material A, the material B, the Guangxi white mud, the silicon carbide and the rho-alumina into a mixer, stirring for 8-10 minutes to prepare a premix.

[0053] Step 4: Add silica sol accounting for 5.4-5.8 wt% of the premix to the premix, stir for 3-5 minutes, and trap t...

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Abstract

The invention relates to a sintered high-alumina refractory brick and a preparation method thereof. The technical scheme of the preparation method comprises the following steps: mixing high-alumina bauxite in a planetary forced mixer, and screening to obtain a material A of which the granularity is 3-5mm; mixing titanium-iron slags in the planetary forced mixer, and screening to obtain a material B of which the granularity is 0.088-2.5mm; burdening material A, material B, Guangxi white clay, silicon carbide and Rho-aluminium oxide according to the weight ratio of 1 to (0.75 to 0.80) to (0.05 to 0.10) to (0.25 to 0.30) to (0.30 to 0.35), evenly stirring, adding silica solution, stirring, ageing mixture, carrying out mechanical pressing, demoulding and drying; then, keeping the temperature for 2-4 hours at the temperature of 1480-1500 DEG C in air atmosphere in a muffle furnace, and carrying out furnace cooling to the room temperature to obtain the sintered high-alumina refractory brick. The preparation method has the characteristics of simple technology and low cost, and the prepared sintered high-alumina refractory brick has the advantages of high compactness and high high-temperature breaking strength and slag corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of high alumina refractory bricks. In particular, it relates to a fired high-alumina refractory brick and a preparation method thereof. Background technique [0002] High alumina refractory bricks are based on Al 2 o 3 As a shaped refractory material with main chemical composition, alumina is widely used in blast furnaces, hot blast stoves and rotary kilns because of its high melting point, high wear resistance and high strength, and good resistance to acid and alkaline slag erosion. Lining of high temperature kiln. [0003] "A low-temperature firing high-alumina refractory brick and its preparation method (CN200810049376.6)" patent technology, mainly using high-alumina bauxite clinker, corundum powder, dry powder pyrophyllite and dry powder refractory clay as the main raw materials , using the traditional brick-making process: kneading, machine pressing, drying the body, and firing in the kiln. Althoug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101
Inventor 张寒赵惠忠李正坤张家勤何健李莉张嘉良李寅
Owner 淄博恒森耐火材料有限公司
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