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Corundum pouring material for kilneye of cement kiln and using method thereof

A castable and cement kiln technology, applied in the field of refractory materials, can solve the problems of poor resistance to sulfide corrosion, poor thermal shock stability, poor alkali corrosion resistance, and low service life, and achieve good thermal shock stability and acid resistance. Strong alkali corrosion ability, effect of improving corrosion resistance and wear resistance

Inactive Publication Date: 2012-09-12
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] "A corundum spinel kiln mouth refractory castable" (CN200810122034.2) patented technology, using corundum as the main raw material, the matrix is ​​mainly spinel phase , its thermal shock stability is better than ordinary corundum low-cement castables, but its resistance to alkali erosion is poor, and its service life is still low
"Special castable for cement kiln mouth and coal injection pipe and its preparation method" (ZL200810243401.4) patented technology, using sintered tabular corundum, sintered synthetic mullite and chrome corundum as aggregates, adding part of spinel phase to the matrix, Form the coexistence state of mullite phase and spinel phase, and add part of zircon sand and synthetic zircon mullite co-grinding powder at the same time, which can further improve the thermal shock stability of the castable; the silicon carbide added in the proportion can further Improve the wear resistance of the castable; however, the composition and ingredients of this patented technology are relatively complicated, and it needs to be cured for more than 7 days before it can be baked and used, and because a certain amount of chrome corundum is used as the raw material, the remaining castable has certain pollution sex
"A high-purity kiln mouth castable" (CN200910099673.6) patent technology, using bauxite corundum and chrome corundum as aggregates, the matrix is ​​mainly mullite phase, and the addition of silicon carbide can further improve the durability of the castable abrasiveness; however, the castable has poor resistance to sulfide erosion and thermal shock stability, and due to the use of a certain amount of chromium corundum as raw material, the remaining castable also has a certain degree of pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A corundum castable for cement kiln mouth and its use method, the raw materials and mass ratio of the corundum castable for cement kiln mouth are:

[0024] Sintered tabular alumina 69~71%;

[0025] Si 3 N 4 Fine powder 12~14%;

[0026] α-Al 2 o 3 Micropowder 2~3%;

[0027] Pure calcium aluminate cement 8~10%;

[0028] Elemental Si powder 3~4%;

[0029] Al powder 0.3~0.6%;

[0030] Stainless steel fiber 1~1.5%;

[0031] Explosion-proof fiber 0.05~0.1%;

[0032] Sodium hexametaphosphate 0.15~0.2%.

[0033] The method of using the corundum castable for the mouth of a cement kiln in this embodiment is to add water with a mass of 5.5 to 6.8% of the castable to the castable, stir evenly, shape, maintain for 2 to 3 days, demould, and bake bake.

[0034] The normal temperature compressive strength of the corundum castable for the cement kiln mouth prepared in this example is ≥87MPa, the room temperature flexural strength is ≥10MPa, the compressive strength is ≥120MP...

Embodiment 2

[0036]A corundum castable for cement kiln mouth and its use method, the raw materials and mass ratio of the corundum castable for cement kiln mouth are:

[0037] Sintered tabular alumina 69~71%;

[0038] Si 3 N 4 Fine powder 13~16%;

[0039] α-Al 2 o 3 Micropowder 2~3%;

[0040] Pure calcium aluminate cement 10~12%;

[0041] Elemental Si powder 2~3%;

[0042] Al powder 0.3~0.6%;

[0043] Stainless steel fiber 1.5~2%;

[0044] Explosion-proof fiber 0.03~0.08%;

[0045] Polycarboxylate superplasticizer 0.1~0.15%.

[0046] The usage method of this embodiment is the same as embodiment 1.

[0047] The normal temperature compressive strength of the corundum castable for the cement kiln mouth prepared in this example is ≥82MPa, the room temperature flexural strength is ≥11MPa, and the compressive strength is ≥125MPa after 1500°C*3h treatment, and the flexural strength is ≥13MPa. Good shock stability, excellent corrosion resistance to alkali, chlorine and sulfur compounds....

Embodiment 3

[0049] A corundum castable for cement kiln mouth and its use method, the raw materials and mass ratio of the corundum castable for cement kiln mouth are:

[0050] Sintered tabular alumina 70~72%;

[0051] Si 3 N 4 Fine powder 13~15%;

[0052] α-Al 2 o 3 Micropowder 1~2%;

[0053] Pure calcium aluminate cement 9~11%;

[0054] Elemental Si powder 2~3%;

[0055] Al powder 0.3~0.6%;

[0056] Stainless steel fiber 1~1.5%;

[0057] Explosion-proof fiber 0.05~0.1%;

[0058] Sodium hexametaphosphate 0.05~0.10%;

[0059] Polycarboxylate superplasticizer 0.05~0.15%.

[0060] The usage method of this embodiment is the same as embodiment 1.

[0061] The normal temperature compressive strength of the corundum castable for the cement kiln mouth prepared in this example is ≥ 90MPa, the room temperature flexural strength is ≥ 12MPa, the compressive strength is ≥ 132MPa after 1500°C*3h treatment, and the flexural strength is ≥ 14MPa. Good shock stability, excellent corrosion resis...

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Abstract

The invention relates to a corundum pouring material for a kilneye of a cement kiln and a using method thereof. The material of the pouring material comprises 69-72% by mass of sintered-plate-shaped corundum, 12-16% by mass of Si3N4 fine powder, 1-3% by mass of alpha-Al2O3 micropowder, 8-12% by mass of pure calcium aluminate cement, 2-4% by mass of elementary substance Si powder, 0.3-0.6% by mass of Al powder, 1-2% by mass of stainless steel fiber, 0.03-0.1% by mass of explosion-proof fiber, and 0.1-0.2% by mass of water reducer. The using method of the corundum pouring material for the kilneye of the cement kiln comprises the following steps: adding water whose mass is equivalent to 5.5-6.8% mass of the pouring material, stirring uniformly, moulding, curing for 2-3 days, demoulding, and roasting. The corundum pouring material for the kilneye of the cement kiln in the invention has the advantages of good thermal shock stability, excellent performance of resistance of corrosion, long service life and friendly environment. The corundum pouring material can meet the producing requirements of a large-scale cement kiln.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a corundum castable for the mouth of a cement kiln and a use method thereof. Background technique [0002] Since the 1970s, dry process cement production technology has been continuously developed and improved. Since the 1990s, my country's dry process cement production has developed rapidly; some large cement rotary kilns (2500t / d, 5000t / d, 8000t / d, etc.) have been built and put into operation. Cement rotary kilns are developing towards large scale, and their operating conditions are becoming more and more harsh. High kiln temperature and fast kiln speed increase the periodic mechanical stress and thermal stress damage, and volatile components such as alkali, chlorine, and sulfur intensify the damage to refractory materials. These put forward higher requirements for refractory materials used in cement kilns. The kiln mouth is one of the key parts of the rotary k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/103C04B7/32
Inventor 桑绍柏李亚伟李远兵赵雷金胜利李淑静
Owner WUHAN UNIV OF SCI & TECH
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