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Calcium hexaluminate/silicon carbide casting material for garbage incinerator and preparation method of casting material

A waste incinerator and calcium hexaaluminate technology, which is applied in the field of calcium hexaaluminate/silicon carbide castables for waste incinerators and its preparation, can solve the problems of unfavorable high-temperature performance of materials, increase of impurities in refractory materials, etc., and achieve enhanced heat resistance Stress damage ability, strong gas corrosion ability, gas corrosion resistance and excellent high temperature mechanical properties

Active Publication Date: 2017-07-21
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of Fe increases the impurities of the refractory material, which is detrimental to the high temperature performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A calcium hexaaluminate / silicon carbide castable for garbage incinerators and a preparation method thereof. The preparation method described in this example is: 40~48wt% calcium hexaaluminate, 47~55% silicon carbide, 2.5~8wt% carbon black, 2~4wt% elemental silicon powder and 0.5~3wt% Silica powder is used as the raw material, plus a water reducing agent accounting for 0.1~0.3wt% of the raw material, mixed uniformly to obtain a premix; then the premix is ​​mixed with silica sol accounting for 5~15wt% of the raw material, and stirred Evenly, the calcium hexaaluminate / silicon carbide castable for garbage incinerators is prepared.

[0029] The water reducer is sodium tripolyphosphate.

[0030] The calcium hexaaluminate / silicon carbide castable for garbage incinerators prepared in this example was molded by vibration casting, cured at room temperature for 24-30 hours, demolded, and baked at 100-120°C for 24-30 hours. After testing: The flexural strength after burning at 12...

Embodiment 2

[0032] A calcium hexaaluminate / silicon carbide castable for garbage incinerators and a preparation method thereof. The preparation method described in this example is: 44~52wt% calcium hexaaluminate, 43~51% silicon carbide, 2~7.5wt% carbon black, 1.5~3.5wt% elemental silicon powder and 1.5~4wt% % silicon micropowder as a raw material, plus a water reducing agent accounting for 0.1~0.3wt% of the raw material, mixed uniformly to obtain a premix; then the premix is ​​mixed with silica sol accounting for 5~15wt% of the raw material and stir evenly to prepare the calcium hexaaluminate / silicon carbide castable for garbage incinerators.

[0033] The water reducer is sodium tetrapolyphosphate.

[0034] The calcium hexaaluminate / silicon carbide castable for garbage incinerators prepared in this example was molded by vibration casting, cured at room temperature for 24-30 hours, demolded, and baked at 100-120°C for 24-30 hours. After testing: The flexural strength after burning at 1200...

Embodiment 3

[0036]A calcium hexaaluminate / silicon carbide castable for garbage incinerators and a preparation method thereof. The preparation method described in this example is: 48~56wt% calcium hexaaluminate, 39~47% silicon carbide, 1~6.5wt% carbon black, 0.5~2.5wt% elemental silicon powder and 3.5~6wt% % silicon micropowder as a raw material, plus a water reducing agent accounting for 0.1~0.3wt% of the raw material, mixed uniformly to obtain a premix; then the premix is ​​mixed with silica sol accounting for 5~15wt% of the raw material and stir evenly to prepare the calcium hexaaluminate / silicon carbide castable for garbage incinerators.

[0037] The water reducer is sodium hexametaphosphate.

[0038] The calcium hexaaluminate / silicon carbide castable for garbage incinerators prepared in this example was molded by vibration casting, cured at room temperature for 24-30 hours, demolded, and baked at 100-120°C for 24-30 hours. After testing: The flexural strength after burning at 1200℃×...

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Abstract

The invention relates to a calcium hexaluminate / silicon carbide casting material for a garbage incinerator and a preparation method of the casting material. The preparation method adopts the technical scheme that the preparation method comprises the steps of taking 40-60wt% of calcium hexaluminate, 35-55wt% of silicon carbide, 1-8wt% of carbon black, 0.5-4wt% of a monatomic silicon powder and 0.5-6wt% of a silicon micropowder as raw materials, adding a water reducing agent accounting for 0.1-0.3wt% of the raw materials, performing uniform mixing to obtain a premix compound, mixing the premix compound with silicasol accounting for 5-15wt% of the raw materials, and performing uniform stirring to obtain the calcium hexaluminate / silicon carbide casting material for the garbage incinerator. The prepared calcium hexaluminate / silicon carbide casting material for the garbage incinerator has the characteristics of excellent medium-high-temperature mechanical property, high heat conductivity, gas corrosion resistance, good thermal shock stability, long service life, energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of calcium hexaaluminate / silicon carbide castable. Specifically relates to a calcium hexaaluminate / silicon carbide castable for garbage incinerators and a preparation method thereof. Background technique [0002] At present, my country's solid waste pollution is very serious, and the amount of waste that needs to be processed by waste incinerators has increased significantly. However, the lack of suitable refractory materials limits the service life of high-temperature waste incinerators and seriously affects the efficiency of waste treatment. Refractory materials for waste incinerators are faced with slag erosion, high temperature gases (HCl, H 2 O, CO, etc.) erosion corrosion, thermal stress spalling and other problems, the service conditions are harsh, and strict requirements are put forward for refractory materials. [0003] Chromium-containing materials have always been considered as a refractory mat...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 顾华志陈定黄奥张美杰白晨李洪明邵志君
Owner WUHAN UNIV OF SCI & TECH
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