CN100560537C - Fireproof product for cement rotary kiln transition belt - Google Patents

Abstract

The present invention relates to a kind of fire proofing composition goods, especially dry method cement rotary kiln transitional zone refractory product basic composition is: Al ₂O ₃〉=90%, volume density 〉=3.0g/cm ³Bauxite clinker skeleton material 50-79%; Silicon carbide 5-20%; Al ₂O ₃〉=32% clay 3-15%; Corundum 3-15%; Wherein silicon carbide, clay, corundum all adopt the 0.1-0mm fine powder form to add, and burning till the back chemical constitution is Al ₂O ₃63-75%, SiO ₂8-32.5%, SiC4.5-19%.Significantly improved the refractory product performance than prior art, making it to be more suitable for cement rotary kiln transition belt uses, burnt product has high refractoriness under load, 0.2Mpa beginning temperature, loading softening reaches 1570-1660 ℃, the cold crushing strength height reaches 85-110Mpa, and it is low also to have thermal conductivity simultaneously, 700 ℃, 1.18W/m.k; 1000 ℃, 1.27W/m.k, magnesia spinel that can more former use reduces the drum surface temperature, and coefficient of thermal expansion is low, and 1000 ℃, 0.61%, thus integral body has prolonged work-ing life, and predicted life can reach 1.5-2 after tested.

Description

Fireproof product for cement rotary kiln transition belt

Technical field

The present invention relates to a kind of fire proofing composition goods, especially dry method cement rotary kiln transitional zone refractory product.

Background technology

Dry method cement rotary kiln transitional zone zone, the temperature height, usually reach about 1600 ℃, and temperature variation is frequent, becomes in the kiln body stress concentrated area the most, cause kliner coating jail not easy to hang, hang when the time is fallen, make fire-resistant kiln lining often directly expose to the open air in high temperature gas flow, and big burned material flow, cause kiln speed to be exceedingly fast again, the destructive force that therefore objectively causes the refractory lining brick at this position to suffer is the strongest.Therefore this position becomes the most severe nuclear of full kiln working conditions, influences kiln body the most key position in work-ing life.Prior art, this position refractory lining brick adopts the magnesia spinel fire proofing composition usually, the magnesia spinel fire proofing composition, though have this position adaptability preferably, thermal conductivity higher (700 ℃, 4.2W/m.k; 1000 ℃, 3.8W/m.k), make that the cylinder of rotary kiln surface temperature is higher; Higher drum surface temperature not only makes hear rate increase, and is unfavorable for save energy; And thermal distortion also more easily takes place in kiln cylinder body, shortened the work-ing life of kiln body.In addition, magnesia spinel, coefficient of thermal expansion height, 1000 ℃, 1.2%, high temperature easily causes kiln lining internal temperature gradient to increase like this, and temperature stress can reach 60-70Mpa, has surpassed the compressive strength of brick itself, cause brick cracking to peel off, cause this position shorter relatively work-ing life, general only one year about.

And along with cement kiln constantly to large scale development, 5000t/d and above large-scale cement rotary kiln have appearred, high output has proposed requirements at the higher level to the transitional zone refractory product.The refractory lining brick that requires this position to use must possess: higher cold crushing strength, refractoriness under load and high corrosion resistance.People know, different use occasions has different requirements to fire proofing composition, and therefore general fire proofing composition does not have versatility.

Summary of the invention

The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of cold crushing strength, refractoriness under load height are provided, corrosion resistance is strong, thermal conductivity, the fireproof product for cement rotary kiln transition belt that coefficient of thermal expansion is low.

Still a further object of the present invention is to provide a kind of 5000t/d of being particularly useful for and above fireproof product for cement rotary kiln transition belt.

Through a large amount of tests, fireproof product for cement rotary kiln transition belt of the present invention basic composition is:

Al ₂O ₃〉=90% and volume density 〉=3.0g/cm ³Bauxite clinker skeleton material 50-79wt%;

Silicon carbide 5-20wt%;

Al ₂O ₃〉=32% clay 3-15wt%;

Corundum 3-15wt%;

Wherein silicon carbide, clay, corundum all adopt the 0.1-0mm fine powder form to add, and burning till the back chemical constitution is Al ₂O ₃63-75%, SiO ₂8-32.5%, SiC4.5-19%.

In addition, for further improving fire proofing composition performance of the present invention, for example the refractoriness under load of goods makes it to be applicable to more large-scale (more than for example 5000t/d reaches) cement rotary kiln transition belt kiln lining.The Al that can also add 3-18wt% in the present composition ₂O ₃〉=57%, Fe ₂O ₃≤ 1.0% andaluzite, the gained refractory product is:

Al ₂O ₃〉=90%, volume density 〉=3.0g/cm ³Bauxite clinker skeleton material 55-75wt%;

Al ₂O ₃〉=57%, Fe ₂O ₃≤ 1.0% andaluzite 3-18wt%;

Silicon carbide 7-18wt%;

Al ₂O ₃〉=32% clay 3-15wt%;

Corundum 3-15wt%;

Wherein andaluzite also adopts the 0.1-0mm fine powder form to add, and burning till the back chemical constitution is Al ₂O ₃60-77%, SiO ₂5.5-33.5%, SiC6.5-17.5%.

What the present invention was more excellent consists of:

Al ₂O ₃〉=90%, volume density 〉=3.0g/cm ³Bauxite clinker skeleton material 58-70wt%;

Al ₂O ₃〉=57%, Fe ₂O ₃≤ 1.0% andaluzite 5-15wt%;

Silicon carbide 8-15wt%;

Al ₂O ₃〉=32% clay 5-12wt%;

Corundum 5-12wt%;

Burning till the back chemical constitution is Al ₂O ₃65-75%, SiO ₂11-28%, SiC7-14%.

Refractory product of the present invention, owing to selected proper raw material and proportioning, make each refractory material reach performance complement, significantly improved the refractory product performance, making it to be more suitable for cement rotary kiln transition belt uses, burnt product has high refractoriness under load, and the 0.2Mpa loading softening begins temperature and reaches 1570-1660 ℃, the cold crushing strength height, reach 85-110Mpa, it is low also to have thermal conductivity simultaneously, and 700 ℃, 1.18W/m.k; 1000 ℃, 1.27W/m.k, magnesia spinel that can more former use reduces the drum surface temperature, and coefficient of thermal expansion is low, and 1000 ℃, 0.61%, thus integral body has prolonged work-ing life, and predicted life can reach 1.5-2 after tested.Especially added andaluzite, improved the firing temperature of refractory product of the present invention, prolong and burn till soaking time, make the complete mullitization of andaluzite, thereby make the goods sintering better, glassy phase content is low, and thing is compared pure, help cold crushing strength and refractoriness under load and improve, make it to be applicable to fully 5000t/d and above cement rotary kiln transition belt.

Below in conjunction with several embodiments, further specify the present invention.

Embodiment

Embodiment 1:Al ₂O ₃91%, volume density 3.2g/cm ³Bauxite clinker skeleton material 65%, silicon carbide 15%, Al ₂O ₃35% clay 10%, corundum 10%, silicon carbide, corundum, clay all adopt≤adding of 0.074mm fine powder form.Mix and press brick, burn till through 1450 ℃.Test result: chemical ingredients Al ₂O ₃72%, SiO ₂12%, SiC14.5%; Physicals: 1570 ℃ of 0.2Mpa refractorinesss under load, cold crushing strength 85Mpa.

Embodiment 2:Al ₂O ₃92%, volume density 3.15g/cm ³Bauxite clinker skeleton material 75%, Al ₂O ₃59.5%, Fe ₂O ₃0.6% andaluzite 5%, silicon carbide 6%, Al ₂O ₃33% clay 5%, corundum 9%, andaluzite, silicon carbide, corundum, clay all adopt≤adding of 0.08mm fine powder form.Mix and press brick, burn till through 1480 ℃.Test result: chemical ingredients Al ₂O ₃79%, SiO ₂14%, SiC5.5%; Physicals: 1610 ℃ of 0.2Mpa refractorinesss under load, cold crushing strength 90Mpa.

Embodiment 3:Al ₂O ₃90%, volume density 3.0g/cm ³Bauxite clinker skeleton material 55%, Al ₂O ₃58%, Fe ₂O ₃1.0% andaluzite 15%, silicon carbide 12%, Al ₂O ₃35% clay 13%, corundum 5%, andaluzite, silicon carbide, corundum, clay all adopt≤adding of 0.074mm fine powder form.Mix and press brick, burn till through 1530 ℃.Test result: chemical ingredients Al ₂O ₃67%, SiO ₂20%, SiC11%; Physicals: 1660 ℃ of 0.2Mpa refractorinesss under load, cold crushing strength 110Mpa.

Embodiment 4:Al ₂O ₃90%, volume density 3.0g/cm ³Bauxite clinker skeleton material 52%, Al ₂O ₃58%, Fe ₂O ₃1.0% andaluzite 10%, silicon carbide 17%, Al ₂O ₃35% clay 8%, corundum 13%, andaluzite, silicon carbide, corundum, clay all adopt≤adding of 0.074mm fine powder form.Mix and press brick, burn till through 1510 ℃.Test result: chemical ingredients Al ₂O ₃67%, SiO ₂15%, SiC16%; Physicals: 1640 ℃ of 0.2Mpa refractorinesss under load, cold crushing strength 100Mpa.

Claims (3)

1, fireproof product for cement rotary kiln transition belt basic composition is:

Al ₂O ₃〉=90% and volume density 〉=3.0g/cm ³Bauxite clinker skeleton material 50-79wt%;

Silicon carbide 5-20wt%;

Al ₂O ₃〉=32% clay 3-15wt%;

Corundum 3-15wt%;

Wherein silicon carbide, clay, corundum all adopt the 0.1-0mm fine powder form to add, and burning till the back chemical constitution is Al ₂O ₃63-75%, SiO ₂8-32.5%, SiC 4.5-19%.

2, according to the described fireproof product for cement rotary kiln transition belt of claim 1, it consists of:

Al ₂O ₃〉=90%, volume density 〉=3.0g/cm ³Bauxite clinker skeleton material 55-75wt%;

Al ₂O ₃〉=57%, Fe ₂O ₃≤ 1.0% andaluzite 3-18wt%;

Silicon carbide 7-18wt%;

Al ₂O ₃〉=32% clay 3-15wt%;

Corundum 3-15wt%;

Wherein andaluzite also adopts the 0.1-0mm fine powder form to add, and burning till the back chemical constitution is Al ₂O ₃60-77%, SiO ₂5.5-33.5%, SiC 6.5-17.5%.

3, according to the described fireproof product for cement rotary kiln transition belt of claim 2, it consists of:

Al ₂O ₃〉=90%, volume density 〉=3.0g/cm ³Bauxite clinker skeleton material 58-70wt%;

Al ₂O ₃〉=57%, Fe ₂O ₃≤ 1.0% andaluzite 5-15wt%;

Silicon carbide 8-15wt%;

Al ₂O ₃〉=32% clay 5-12wt%;

Corundum 5-12wt%;

Burning till the back chemical constitution is Al ₂O ₃65-75%, SiO ₂11-28%, SiC 7-14%.