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A kind of calcium hexaaluminate-calcium titanate composite refractory raw material and preparation method thereof

A refractory raw material, calcium hexaaluminate technology, applied in the field of calcium hexaaluminate, can solve the problems of small crystal size of calcium hexaaluminate, high production cost, excessive glass phase, etc. High temperature performance, the effect of increasing the average size

Active Publication Date: 2022-07-19
WUHAN UNIV OF SCI & TECH +1
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Problems solved by technology

[0004] José G prepared calcium hexaaluminate-calcium titanate composite materials by solid phase sintering of metal titanium powder, high-purity alumina and calcium carbonate (José G, et al. Synthesis and effect of CaTiO 3 formation in CaO·Al 2 o 3 by solid-state reaction from CaCO 3 ·Al 2 o 3 and Ti [J]. Materials Chemistry and Physics, 2019,232(15):57-64.), studies have shown that compared with pure calcium aluminate titanate, calcium hexaaluminate-calcium titanate composite materials have higher strength and Fracture toughness, but the purity of raw materials used in this method requires high production costs
[0005] Luo Xudong et al. prepared calcium hexaaluminate-calcium titanate composite materials using aluminum-titanium slag and active lime from ferroalloy factories (Luo Xudong et al. Study on the synthesis of calcium hexaaluminate materials by solid-state reaction of aluminum-titanium slag[J]. Journal of Synthetic Crystals, 2013, 42(5):209-212.), the method uses active lime to increase the cost, and the existence of a large number of glass phases in the prepared composite material is not conducive to the high temperature performance of the material, and the crystal size of calcium hexaaluminate is relatively small (<10μm)
[0006] Guan Zhigang et al. used aluminum-titanium slag, high-purity alumina and active lime by adding high-purity Er 2 o 3 Er-doped calcium hexaaluminate-calcium titanate composite materials were prepared (Guan Zhigang et al. Er 2 o 3 to CaTiO 3 / CaAl 12 o 19 The influence of crystallization properties of materials [J]. Journal of Materials Heat Treatment, 2014, 35(7): 53-58.), although this method has improved the crystal size of calcium hexaaluminate (2 o 3 As a rare earth oxide, it is expensive and not conducive to large-scale industrial production
[0007] Fan Chunhong et al. used aluminum-titanium slag, high-purity alumina and active lime by adding high-purity ZrO 2 Prepared ZrO 2 Doped calcium hexaaluminate-calcium titanate composite material (Fan Chunhong et al. ZrO 2 The effect on the composition and structure of perovskite / calcium hexaaluminate composite materials [J]. Silicate Bulletin, 2013, 32(8): 1534-1539.), but this method still fails to solve the problem of glass in the prepared material too many phases

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  • A kind of calcium hexaaluminate-calcium titanate composite refractory raw material and preparation method thereof

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Embodiment 1

[0038] A calcium hexaaluminate-calcium titanate composite refractory raw material and a preparation method thereof. The specific steps of the preparation method are:

[0039] Step 1. According to the mass ratio of titanium-iron slag block: titanium-iron slag particles being 8.2:1, the titanium-iron slag block is placed on the sand cushion layer paved with titanium-iron slag particles, and placed in an air atmosphere and 1560 It is calcined for 6 hours under the condition of ℃, cooled, and the bedding layer is discarded to obtain a calcined titanium-iron slag block, which is a porous block.

[0040] Step 2. After crushing the porous block, add it into a ball mill, and grind it to a particle size of ≤100 μm to obtain ball abrasive.

[0041] Step 3. Pressing the ball abrasive under the condition of 130MPa to obtain a green body; placing the green body in an electric resistance furnace, keeping the temperature at 1470°C for 1 hour, cooling and crushing to obtain hexaaluminate Ca...

Embodiment 2

[0046] A calcium hexaaluminate-calcium titanate composite refractory raw material and a preparation method thereof. The specific steps of the preparation method are:

[0047] Step 1. According to the mass ratio of titanium-iron slag blocks: titanium-iron slag particles being 8.6:1, the titanium-iron slag blocks are placed on the sand cushion layer paved with titanium-iron slag particles, and placed in an air atmosphere and 1580 It is calcined at ℃ for 4 hours, cooled, and the bedding layer is discarded to obtain a calcined titanium-iron slag block, which is a porous block.

[0048] Step 2. After crushing the porous block, add it into a ball mill, and grind it to a particle size of ≤100 μm to obtain ball abrasive.

[0049] Step 3. Machine-press the ball abrasive under the condition of 150MPa to obtain a green body; place the green body in a resistance furnace, keep at 1500°C for 2 hours, cool and crush to obtain hexaaluminate Calcium-calcium titanate composite refractory raw ...

Embodiment 3

[0054] A calcium hexaaluminate-calcium titanate composite refractory raw material and a preparation method thereof. The specific steps of the preparation method are:

[0055] Step 1. According to the mass ratio of titanium-iron slag block: titanium-iron slag particles being 9:1, the titanium-iron slag block is placed on the sand cushion layer paved with titanium-iron slag particles, and placed in an air atmosphere and 1620 It is calcined at ℃ for 5 hours, cooled, and the bedding layer is discarded to obtain a calcined titanium-iron slag block, which is a porous block.

[0056] Step 2. After crushing the porous block, add it into a ball mill, and grind it to a particle size of ≤100 μm to obtain ball abrasive.

[0057] Step 3. Pressing the ball abrasive under the condition of 145MPa to obtain a green body; placing the green body in an electric resistance furnace, keeping the temperature at 1460°C for 3 hours, cooling and crushing to obtain hexaaluminate Calcium-calcium titanat...

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Abstract

The invention relates to a calcium hexaaluminate-calcium titanate composite refractory raw material and a preparation method thereof. The technical scheme is as follows: placing the ferrotitanium slag block on the cushion sand layer paved with titanium iron slag particles, calcining for 4 to 6 hours under the condition of air atmosphere and 1560-1620 ℃, cooling, and removing the cushion layer, The porous block is obtained; then crushed, ball-milled, machine-pressed, placed in a resistance furnace, kept at 1450-1500°C for 1-3 hours, cooled and crushed to obtain calcium hexaaluminate-calcium titanate composite Phase refractory raw materials. The main crystal phases of the calcium hexaaluminate-calcium titanate composite refractory raw material are calcium hexaaluminate and calcium titanate, and the other phases are titanium dioxide. The invention has the advantages of simple process and low production cost; the prepared product has the characteristics of less impurities, high melting point, large bulk density, high refractoriness, high strength, stable high temperature performance and large size of calcium hexaaluminate.

Description

technical field [0001] The invention belongs to the technical field of calcium hexaaluminate. Specifically, it relates to a calcium hexaaluminate-calcium titanate composite refractory raw material and a preparation method thereof. Background technique [0002] At present, the smelting of ferro-titanium in my country mainly uses the aluminothermic reduction method, using ilmenite as the main raw material, using aluminum as the reducing agent, and preparing ferro-titanium through aluminothermic reaction under high temperature conditions (generally above 1900 °C). In order to improve the yield of ferrotitanium alloy, CaO is often added as a flux in modern industrial production to reduce the melting point of the slag and facilitate the sedimentation and separation of the alloy. According to the "Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Wastes", "Guidelines for the Identification of Solid Wastes", "National List of H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B33/138
CPCC04B35/66C04B33/138C04B2235/3222C04B2235/3236C04B2235/77C04B2235/786C04B2235/96C04B2235/9607Y02P40/60
Inventor 赵惠忠李轶翀冯立刘艳丽
Owner WUHAN UNIV OF SCI & TECH