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Electric smelting magenisum aluminum spinel brick for coal water slurry gasifying furnace and preparation method thereof

A technology of aluminum spinel and gasifier, which is applied in the field of fused magnesia-aluminum spinel bricks and its preparation for coal-water slurry gasifiers, and can solve threats to human and animal health, environmental pollution, and damage to brick linings, etc. problems, to achieve the effect of excellent anti-coal slag penetration performance, high bulk density, and strong anti-stripping ability

Inactive Publication Date: 2013-09-18
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the structure and performance of the metamorphic layer are quite different from those of the original brick layer, structural stress will inevitably result in cracks on the hot surface of the brick lining. As the cracks expand, part of the refractory material will separate from the brick body, forming peeling, resulting in Severe damage to brick lining
[0004] In addition, trivalent chromium and hexavalent chromium ions have a strong carcinogenic effect on the human body and organisms
Cr in high chrome brick 2 0 3 The content is very high, and a large amount of use is bound to seriously pollute the environment and threaten the health of humans and animals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] An electric fused magnesia-aluminum spinel brick used in a coal-water slurry gasifier and a preparation method thereof. First, 58~61wt% industrial alumina powder and 39~42wt% light-burned magnesia powder are used as raw materials, and 0.5~1.5wt% coke of the raw materials is added, and stirred evenly; put into the electric arc furnace, use 100~120V Voltage electric melting until the raw materials are completely melted, and then continue to smelt for 30~40 minutes, pour the smelted high-temperature synthetic material into the mold; then place it in the tunnel kiln and anneal with the mold at 1350~1380℃, the annealing cycle is 72~ After 78 hours, leave the kiln at 30-40°C and demould; finally, the demoulded product is machined to obtain fused magnesia-aluminum spinel bricks for coal-water slurry gasifiers.

[0015] The bulk density of the fused magnesia-aluminum spinel brick used in the coal-water slurry gasifier prepared in Example 1 is 3.08~3.11g / cm 3 , the apparent por...

Embodiment 2

[0017] An electric fused magnesia-aluminum spinel brick used in a coal-water slurry gasifier and a preparation method thereof. First, 61~64wt% industrial alumina powder and 36~39wt% light-burned magnesia powder are used as raw materials, and 1.5~2.5wt% coke is added to the raw materials, and stirred evenly; put into the electric arc furnace, use 120~140V Voltage electric melting until the raw materials are completely melted, and then continue to smelt for 40~50 minutes, pour the smelted high-temperature synthetic material into the mold; then place it in a tunnel kiln and anneal with the mold at 1380~1410℃, the annealing cycle is 78~ After 84 hours, leave the kiln at 40-50°C and demould; finally, the demoulded product is machined to obtain fused magnesia-aluminum spinel bricks for coal-water slurry gasifiers.

[0018] The bulk density of the fused magnesia-aluminum spinel brick used in the coal-water slurry gasifier prepared in Example 2 is 3.10~3.13g / cm 3 , the apparent poros...

Embodiment 3

[0020] An electric fused magnesia-aluminum spinel brick used in a coal-water slurry gasifier and a preparation method thereof. First use 64~67wt% industrial alumina powder and 33~36wt% lightly burned magnesia powder as raw materials, add 2.0~3.0wt% coke of the raw materials, stir evenly; put it into the electric arc furnace, use 140~160V Voltage electric melting until the raw materials are completely melted, and then continue to smelt for 50~60 minutes, pour the smelted high-temperature synthetic material into the mold; then place it in the tunnel kiln and anneal with the mold at 1410~1440℃, the annealing cycle is 84~ After 90 hours, leave the kiln at 50-60°C and demould; finally, the demolded product is machined to obtain fused magnesia-aluminum spinel bricks for coal-water slurry gasifiers.

[0021] The bulk density of the fused magnesia-aluminum spinel brick used in the coal-water slurry gasifier prepared in Example 3 is 3.11~3.14g / cm 3 , the apparent porosity is 2.27~2.67...

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Abstract

The invention particularly relates to an electric smelting magenisum aluminum spinel brick for a coal water slurry gasifying furnace and a preparation method of the electric smelting magenisum aluminum spinel brick. The technical scheme is as follows: the preparation method comprises the following steps of: taking 58-74 wt% of industrial aluminum oxide powder and 26-42 wt% of light roasting magenisum oxide powder as raw materials; additionally adding carbon powder which is 0.5-3.0 wt% of the raw materials; uniformly agitating; putting the mixture into an electric arc furnace and electrically smelting by utilizing a 100-220 V voltage until all the raw materials are fused; continually smelting for 30-60 minutes and casting a smelted high-temperature synthetic material into a casting mould; then, placing the material into a tunnel kiln to be annealed by a belt mould under the condition of 1350-1550 DEG C, wherein the annealing period is 72-120 hours; discharging the material out of the kiln under the condition of 30-80 DEG C and de-molding; and finally, carrying out mechanical machining on a de-molded product to obtain the electric smelting magenisum aluminum spinel brick. The electric smelting magenisum aluminum spinel brick prepared by the invention has the characteristics of low apparent porosity, strong anti-stripping capability and good anti-coal-slag penetrating performance, and can better adapt to a working environment of a hot surface of a liner of the coal water slurry gasifying furnace.

Description

technical field [0001] The invention belongs to the technical field of fused magnesia-aluminum spinel refractory materials, and in particular relates to a fused magnesia-aluminum spinel brick for a coal-water slurry gasifier and a preparation method thereof. Background technique [0002] Coal-water slurry gasifier uses coal-water slurry as raw material to produce CO and H 2 Device for mixing gases. Its lining hot surface refractory is used in very harsh conditions, such as the working temperature in the furnace can reach 1550 ° C, the gas pressure in the furnace can reach 8 MPa, the reducing atmosphere is strong, the melting point of coal slag is low, the viscosity is small and the acidity is strong; at the same time The refractories lining the hot face are also subject to high-velocity air scour and sharp fluctuations in temperature. [0003] At present, high chrome bricks, also known as Cr 2 0 3 -Al 2 0 3 -ZrO 2 Brick, although the solubility of the brick in coal sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 李亚伟徐义彪桑绍柏李远兵赵雷李淑静
Owner WUHAN UNIV OF SCI & TECH
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