CN103373856B

CN103373856B - High-stress-strain low-creepage high-thermal-shock-resistance refractory brick and manufacturing method thereof

Info

Publication number: CN103373856B
Application number: CN201210125704.2A
Authority: CN
Inventors: 李富朝; 李建涛; 孙庚辰; 周国录
Original assignee: ZHENGZHOU ANNEC INDUSTRIAL Co Ltd
Current assignee: ZHENGZHOU ANNEC INDUSTRIAL Co Ltd
Priority date: 2012-04-26
Filing date: 2012-04-26
Publication date: 2015-05-20
Anticipated expiration: 2032-04-26
Also published as: CN103373856A

Abstract

The invention discloses a manufacturing method of a refractory brick. According to the manufacturing method, low-and-medium-grade andalusite (the contents of Al2O3 are 53%, 55% and 57%) are used as main raw materials, large and intermediate andalusite particles are replaced with large mullite particles and intermediate cordierite particles, and corundum, alpha-Al2O3 micropowder and SiO2 micropowder and combining clay and waste paper pulp are added. The preparation method comprises the following steps of: mixing the ingredients in a wet pan mill evenly and then discharging out of the mill; forming by a frictional brick press; drying the formed green blanks in a dryer; calcining the dried blanks in a calcining kiln, wherein the highest calcining temperature ranges from 1370DEG C to 1400DEG C. The refractory brick obtained by adopting the method can effectively solve the problems of the conventional refractory brick, such as high manufacturing cost, low load softness, large creepage, poor anti-seismic property and short service life; the appearance defects of the refractory brick are fewer, and the refractory brick can be widely applied in a ceramic burner of an ironmaking blast-furnace hot blast stove.

Description

A kind of high RUL, low creep, highly heatproof and shockproof refractory brick and manufacture method thereof

Technical field

A kind of high RUL that the ceramic burner that the present invention relates to iron-smelting blast furnace hotblast stove uses, low creep, highly heatproof and shockproof refractory brick and manufacture method thereof.

Background technology

The progress of science and technology needs with fast-developing and make the life-span of hotblast stove more and more longer, what demand did not match therewith is in hotblast stove ceramic burner refractory brick used because of working conditions harsh, loading under long term high temperature, temperature variation is large, frequency is high, cause its life-span short, therefore be necessary the refractory brick researching and developing a kind of high RUL, low creep, highly heatproof and shockproof, thus improve the bulk life time of hotblast stove.The refractory brick that patent CN200510107318.0 describes adopts mullite macrobead, trichroite, andaluzite are base-material, obtained refractory brick solves the problem of poor seismic behavior, but is mainly mullite and the content of trichroite is higher due to particulate state, make lotus soft low, creep is large.Patent CN200510107316.1 take high aluminium material as main raw material, although reduce cost, because the content of high aluminium material is higher, make the lotus of this refractory brick soft low, creep is poor, and the anti-thermal shock of 1300 DEG C of water-cooleds is poor.Therefore, be necessary to research and develop the performance that a kind of refractory brick can meet high RUL, low creep, highly heatproof and shockproof simultaneously.

Summary of the invention

The object of the invention is to ensure the existing good heat-shock resistance of ceramic combustor of hot-blast stove brick, the creep resistance had again and higher refractoriness under load and provide a kind of low cost, high RUL, low creep, highly heatproof and shockproof brick, to improve the bulk life time of hotblast stove.

Another object of the present invention is to provide a kind of preparation method of this refractory brick.

The batching preparing refractory brick of the present invention is composed of the following components by weight percentage:

In refractory brick batching of the present invention, the andaluzite (Al of low grade in adopting aboundresources, price lower ₂o ₃content 53%, 55%, 57%) be main raw material, to reduce production cost; Particulate material mainly adopts andaluzite and a small amount of synthesis of dichroite, soft with the lotus of improving refractory brick, reduces creep; Because the thermal expansivity of trichroite is very little, adopt part trichroite raw material to replace andaluzite, improve the heat-shock resistance of refractory brick further, to extend the work-ing life of refractory brick; Due to the andaluzite of low grade in employing, in order to improve the macroscopic irregularity (blackspot, solution cavity, crackle etc.) of andalusite brick, adopting the natural mullite synthesizing part of M70 to replace andaluzite macrobead (1-3mm), improving the qualification rate of andalusite brick.

In above-mentioned raw materials, the content of synthesis of dichroite is preferably 10%, and the content of mullite synthesizing is preferably 20%.

The method preparing refractory brick of the present invention is made up of following steps successively:

(1) by above-mentioned weight percent, batching is carried out mixing in edge runner-wet mill, first overstriking (1-3mm), in (< 1mm) particle, add spent pulping liquor afterwards again, after making paper pulp whole wet granulate at night, add fine powder (≤180 order) again, mix evenly to go out to grind;

(2) carry out on friction press shaping;

(3) green compact of forming are filled dry kiln car, advance tunnel drier dry;

(4) dried base substrate is pressed loading of kiln figure kiln loading vehicle, push tunnel like calcining kiln and burn till, the highest temperature of burning till is 1370 DEG C-1400 DEG C.

Embodiment

The present invention is further illustrated below by embodiment and comparative example.

Embodiment 1

First, prepare by listed weight percent according to each batching of embodiment in table 11 correspondence, batching is inserted in edge runner-wet mill and carry out wet stone roller, first overstriking (1-3mm), in (< 1mm) particle, then spent pulping liquor is added, after making paper pulp whole wet granulate at night, then add fine powder (≤180 order), mixing evenly after go out to grind.Be placed in compression moulding in friction press again, after the green compact of forming are filled dry kiln car, advance tunnel drier dry.Dried base substrate by loading of kiln figure kiln loading vehicle, pushes tunnel like calcining kiln and burns till, and the highlyest burns till temperature 1370 DEG C-1400 DEG C.The lotus of measuring this refractory brick is soft, creep rate and heat-shock resistance, lists test result in Table 1.

Embodiment 2

Each component concentration of specifying by embodiment in table 12 repeats the method for embodiment 1, and test that its lotus is soft, creep rate and heat-shock resistance.

Table 1

The refractory brick that composition proportion is conventionally made into, and the result that, creep rate soft to its lotus and heat-shock resistance are tested is as shown in comparative example 1 and comparative example 2:

Comparative example 1

According to table 2, batching is prepared by listed weight percent, through evenly mixing, shaping with forming machine, then fire in sintering oven under >=1350 DEG C of high temperature and form.The lotus of then measuring this refractory brick is soft, creep rate and heat-shock resistance, lists test result in table 2.

Table 2

Comparative example 2

According to table 3, batching is prepared by listed weight percent, through evenly mixing, shaping with forming machine, then fire in sintering oven under >=1350 DEG C of high temperature and form.The lotus of then measuring this refractory brick is soft, creep rate and heat-shock resistance, lists test result in table 3.

Table 3

(note: in above table, the negative sign of creep rate represents compression.)

Conclusion: the lotus of comparing embodiment and comparative example product is soft, creep rate and anti-thermal shock data known, its lotus of product adopting composition proportion of the present invention and method to produce is soft, creep rate and thermal shock resistance comparatively prior art be enhanced.

Claims

1. high RUL, low creep, a highly heatproof and shockproof refractory brick, the batching of producing this refractory brick is composed of the following components by weight percentage:

Be absolutely on basis at above-mentioned all components, additionally add the spent pulping liquor of 3-4% again.

2. a kind of high RUL according to claim 1, low creep, highly heatproof and shockproof refractory brick, is characterized in that, described andaluzite is the andaluzite of low grade in adopting.

3. a kind of high RUL according to claim 1, low creep, highly heatproof and shockproof refractory brick, is characterized in that, 1-3mm mullite synthesizing content is 20%.

4. a kind of high RUL according to claim 1, low creep, highly heatproof and shockproof refractory brick, is characterized in that, 0-1mm synthesis of dichroite content is 10%.

5. the method for the high RUL more than preparation described in arbitrary claim, low creep, highly heatproof and shockproof refractory brick, is characterized in that the method comprises and is made up of following steps:

(1) in edge runner-wet mill, the andaluzite that granular size is 1-3mm and mullite synthesizing is first added, add andaluzite and synthesis of dichroite that particle is less than 1mm again, then add spent pulping liquor, make described paper pulp give up after whole wet granulate at night, add≤180 object fine powders again, mix evenly to go out to grind;

(2) carry out on friction press shaping;

(3) green compact of forming are filled dry kiln car, advance tunnel drier dry;

(4) dried base substrate is pressed loading of kiln figure kiln loading vehicle, be between 1370 DEG C-1400 DEG C in the highest temperature of burning till, push tunnel like calcining kiln and burn till.