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Calcium hexaluminate/gehlenite diphase heat-insulation refractory material and preparation method thereof

A calcium aluminate feldspar, thermal insulation technology, applied in the field of refractory materials, can solve the problems of low mechanical strength, wear resistance, limited commercial prospects, low production efficiency, etc., and achieves good thermal insulation effect and good wear resistance. , the effect of low density

Inactive Publication Date: 2013-10-16
田玉明 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the existing technologies use pure chemical raw materials to synthesize CA 6 , high cost, complex process, low production efficiency, low mechanical strength and low wear resistance, and limited commercial prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] According to the proportion by weight of 38.56% of magnesium slag, 4.83% of kaolin and 56.61% of industrial alumina, water is used as the grinding medium for ball milling, the ball milling time is 30min, and the speed is 300r / min, and then the raw material after drying is added 4wt.% The PVA plasticizer is granulated and molded under 20MPa. After forming, put the green body in the furnace for sintering under air atmosphere, heat up to 1200°C at the fastest heating rate allowed by the equipment, then heat up to 1400°C at a heating rate of 2°C / min, keep it warm for 0.5h, and then follow the furnace After cooling to room temperature, the calcium hexaaluminate / calcium-aluminum feldspar composite material is obtained.

[0016] The prepared calcium hexaaluminate / calcium aluminate feldspar composite material, the main phase is CaAl 12 o 19 and Ca 2 al 2 SiO 7 , where Al 2 o 3 Content 60wt.%, CaO content 28wt.%, SiO 2 Content 12wt.%.

Embodiment 2

[0018] According to the weight percentage of 29.07% of magnesium slag, 3.64% of kaolin and 67.29wt.% of industrial alumina, the ingredients are mixed by ball milling with water as the grinding medium. The ball milling time is 30min and the speed is 300r / min. .% PVA plasticizer to granulate and shape under 30MPa. After forming, put the green body in the furnace for sintering in air atmosphere, heat up to 1200°C at the fastest heating rate allowed by the equipment, then heat up to 1500°C at a heating rate of 5°C / min, keep it for 3 hours, and then cool down with the furnace to At room temperature, the calcium hexaaluminate / calcium-aluminum feldspar composite material is obtained.

[0019] The prepared calcium hexaaluminate / calcium-aluminum feldspar composite material, the main phase is CaAl 12 o 19 and Ca 2 al 2 SiO 7 , where Al 2 o 3 Content 71wt.%, CaO content 20wt.%, SiO 2 Content 9wt.%.

Embodiment 3

[0021] According to the weight percentage of 20.77% of magnesium slag and 79.22% of industrial alumina, the mixture is ball milled with water as the grinding medium, the ball milling time is 30min, and the speed is 300r / min, and then the raw material after drying is added with 4wt.% PVA for plasticization The agent is granulated and molded under 40MPa. After forming, put the green body in the furnace for sintering under air atmosphere, heat up to 1200°C at the fastest heating rate allowed by the equipment, then heat up to 1550°C at a heating rate of 4°C / min, keep it for 4 hours, and then cool down with the furnace to At room temperature, the calcium hexaaluminate / calcium-aluminum feldspar composite material is obtained.

[0022] The prepared calcium hexaaluminate / calcium-aluminum feldspar composite material, the main phase is CaAl 12 o 19 and Ca 2 al 2 SiO 7 , where Al 2 o 3 Content 81wt.%, CaO content 15wt.%, SiO 2 Content 4wt.%.

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Abstract

The invention relates to a calcium hexaluminate (CA6) / gehlenite (C2AS) diphase heat-insulation refractory material and a preparation method thereof, and belongs to the technical field of refractory materials. In the invention, the raw materials of the refractory material comprise 20-50wt% of an industrial waste magnesium residue generated through Pidgeon process industrial magnesium making, 0-24wt% of kaolin and 26-80wt% of industrial alumina, and the sum of the above proportions of the raw materials is 100%. The preparation method comprises the following steps: burdening the raw materials according to the above proportions, uniformly mixing the raw materials, adding certain amounts of a binder and a pore forming agent, carrying out compression molding, and carrying out high temperature sintering in the air atmosphere to prepare the diphase heat-insulation refractory material with the CA6 and the C2AS as the principal crystalline phases. The main chemical components of the refractory material comprise CaO, Al2O3 and SiO2. The refractory material has the characteristics of low production cost, small density, good heat shock resistance, good heat insulation effect, high mechanical strength, good wear resistance and the like, and can be used in high temperature containers and kilns as a liner high temperature material.

Description

Technical field: [0001] The invention relates to a calcium hexaaluminate / calcium-aluminum feldspar composite-phase thermal insulation refractory material prepared by using magnesium slag and a preparation method thereof, belonging to the field of refractory materials. Background technique: [0002] Magnesium slag is a kind of industrial waste discharged from the metal magnesium factory when the Pidgeon method is used to smelt magnesium. The main chemical components are CaO, SiO 2 、Al 2 o 3 . Studies have shown that magnesium slag has certain pozzolanic activity. The treatment of most magnesium slags is mainly based on stacking and burying, with few utilization methods and extremely low utilization rate. Although some magnesium factories use magnesium slag for temporary roads and floor filling in the factory area, the use effect is not good due to its low strength. Good, this will not only waste resources, but also pollute the environment. [0003] In recent years, calci...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 田玉明柴跃生白频波邱刘征官冯芙蓉郑建军孙刚宫长伟丁国巍
Owner 田玉明
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