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Dedicated pouring material for cement kiln outlet and jetting coal pipe and preparation method thereof

The technology of coal injection pipe and cement kiln is applied in the field of refractory materials and their preparation, which can solve the problems of cracking and spalling of furnace lining materials, large changes in cold and heat, bursting of furnace linings, etc., and achieves good spalling resistance, improved thermal shock resistance and service life. long effect

Inactive Publication Date: 2009-06-03
JIANGSU GUOHAO REFRACTORY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Because the mouth of the cement kiln and the coal injection pipe are severely eroded by alkali steam, the general refractory castables and refractory bricks undergo an irreversible volume change due to alkali corrosion expansion, which is easy to crack and peel off the furnace lining material, which is the main reason for the damage of this part. And because the cold and heat changes greatly when the kiln is started and stopped, it is easy to cause the furnace lining to burst and fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A special castable for cement kiln mouth and coal injection pipe, which contains the following components by weight percentage:

[0041] Sintered tabular alumina 5-8mm 10%;

[0042] Sintered tabular alumina 3-5mm 10%;

[0043] Sintered tabular alumina 1-3mm 6%;

[0044] Sintered synthetic mullite 5-8mm 10%;

[0045] Sintered synthetic mullite 3-5mm 8%;

[0046] Sintered synthetic mullite 1-3mm 10%;

[0047] Chrome corundum 0-1mm 12%;

[0048] Silicon carbide below 200 mesh 8%;

[0049] Silicon carbide ultrafine powder below 4μm 3%;

[0050] Magnesium aluminum spinel 0-1mm 3%;

[0051] Zircon sand 0.2-0.3mm 4%;

[0052] Active Al 2 o 3 Micropowder below 4μm 3%;

[0053] Silica powder 4%;

[0054] Pure calcium aluminate cement (Al 2 o 3 80 cement) 4%;

[0055] Synthetic zirconia-mullite co-ground powder 5%;

[0056] (additional) stainless steel fiber 1.5%;

[0057] (additional) compound admixture 0.12%;

[0058] (additional) explosion-proof fiber 0.1%. ...

Embodiment 2

[0063] A special castable for cement kiln mouth and coal injection pipe, which contains the following components by weight percentage:

[0064] Sintered plate just 5-8mm 8%;

[0065] Sintered tabular alumina 3-5mm 8%;

[0066] Sintered tabular alumina 1-3mm 10%;

[0067] Sintered synthetic mullite 5-8mm 14%;

[0068] Sintered synthetic mullite 3-5mm 8%;

[0069] Sintered synthetic mullite 1-3mm 6%;

[0070] Chrome corundum 0-1mm 10%;

[0071] Silicon carbide below 200 mesh 7%;

[0072] Silicon carbide ultrafine powder below 4μm 4%;

[0073] Magnesium aluminum spinel below 1mm 3%;

[0074] Zircon sand 0.2-0.3mm 6%;

[0075] Active Al 2 o 3 Micropowder below 4μm 3%;

[0076] Silica powder 5%;

[0077] Pure calcium aluminate cement (Al 2 o 3 80 cement) 3%;

[0078] Synthetic zirconia-mullite co-ground powder 5%;

[0079] (additional) stainless steel fiber 1%;

[0080] (additional) compound admixture 0.15%;

[0081] (additional) explosion-proof fiber 0.05%.

[0...

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Abstract

The invention discloses a dedicated pouring material for a cement kiln outlet and a jetting coal pipe, which comprises the following components by the weight percentage: 20 to 30 percent of sintered plate-shaped corundum, 20 to 30 percent of sintered and synthesized mullite, 10 to 15 percent of chrome corundum, 5 to 10 percent of silicon carbide, 3 to 5 percent of silicon carbide superfine powder, 3 to 5 percent of magnesia alumina spinel, 5 to 8 percent of zircon sand, 2 to 5 percent of activated Al2O3 micro powder, 2 to 5 percent of silicon micro powder, 3 to 5 percent of pure calcium aluminate cement, 1 to 2 percent of stainless steel fiber, 5 to 10 percent of synthesized zirconium mullite grinding powder, 0.1 to 0.15 percent of composite additives and 0.01 to 0.1 percent of explosion proof fiber. The invention further discloses a method for preparing the pouring material. The pouring material is applicable to the dry-process cement kiln outlets and the jetting coal pipes in large-scale cement plants and has the advantages of high wear resistance, good anti-stripping resistance and long service life.

Description

technical field [0001] The invention relates to a refractory material and a preparation method thereof, in particular to a special pouring material for a cement kiln mouth and a coal injection pipe and a preparation method thereof. Background technique [0002] Because the mouth of the cement kiln and the coal injection pipe are severely eroded by alkali steam, the general refractory castables and refractory bricks undergo an irreversible volume change due to alkali corrosion expansion, which is easy to crack and peel off the furnace lining material, which is the main reason for the damage of this part. And because the cold and heat changes greatly when the kiln is started and stopped, it is easy to cause the furnace lining to burst and fall off. Therefore, there is an urgent need for a castable with better comprehensive properties such as high temperature resistance, thermal shock resistance, alkali corrosion resistance, and spalling resistance. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 周建国俞建忠
Owner JIANGSU GUOHAO REFRACTORY TECH
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