CN1359875A - Preparing process and product of huronite-mullite brick - Google Patents

Abstract

A refractory brick is prepared from disthene through mixing it with alpha-Al2O3 and an ore, grinding, adding white cement, stirring and sintering. Its advantages are low thermal conductivity, high specific strength and stripping and thermal shock resistance, and high working temp.

Description

Lime feldspar is in conjunction with the manufacture method and the goods thereof of mullite brick

The present invention relates to a kind of production technique of refractory materials, particularly relating to the mullite is the manufacture method of the light fire brick of principal crystalline phase; And the refractory materials that makes of Using such method.

Refractory materials is the base mateiral of high-temperature technology.High-purity mullite series high alumina refractory wherein, owing to have the good high-temperature thermal property, high-temperature-resistant structure, intensity advantages of higher and being used widely, as be used in the Thermal Equipments such as electric furnace top, hotblast stove.In order to improve high-purity mullite (3Al ₂O ₃2SiO ₂) high-temperature behavior, have the point of destination subsequently again and in the mullite raw material, mix some benefit materials, to satisfy the different service requirements of fire proofed wood, disclose a kind of sintering zirconium as Chinese patent (patent No. 97105666.8) and do not come brick and preparation method thereof, mixed ZrO in this goods raw material ₂, but it is generally acknowledged that oxide impurities such as NaO, CaO are to Al ₂O ₃-SiO ₂Be that phase material exists harmful effect.And 1999 the 2nd phases of magazine " refractory materials " (the 33rd volume), 76 pages of research documents of having published one piece " lime feldspar is in conjunction with research of mullite light fire brick ", proposed that comprehensive utilization lime feldspar thermal conductivity is low, antistrip performance and the high advantage of mullite product use temperature, and sintering to make a kind of be to be the lightweight refractory of principal crystalline phase in conjunction with phase, mullite with lime feldspar.But the disclosed production method of this article biases toward theoretic discussion, and the research of its production method only limits to add the moulding of white cement mixed sintering with kyanite.Lack necessary technological process condition and additive, not only the physical and chemical index of goods is undesirable for the goods of Sheng Chaning according to this, and yield rate is not high, and mullite formation temperature height in the sintering process, is unfavorable for the reduction of sintering energy consumption.

The object of the present invention is to provide a kind ofly both to have had that the lime feldspar thermal conductivity is low, antistrip performance is excellent, have the manufacture method of the high lime feldspar of mullite product use temperature in conjunction with mullite brick again, this manufacture method is the yield rate height not only, and is simple and easy to do; And sintering temperature is low, shortens calcination time, saves sintering energy consumption.

For achieving the above object, lime feldspar of the present invention comprises following step in conjunction with the manufacture method of mullite brick:

(1) with the screening of natural kyanite and flint clay broken and with α-Al ₂O ₃Mixer mill is fine into powder;

(2) in above-mentioned powder, add white cement to form mixture, its kyanite, α-Al ₂O ₃, flint clay and white cement weight consist of:

Kyanite 80-92%

α-Al ₂O ₃ 2-10％

Flint clay 2-6%

White cement 3-8%

In above-mentioned raw materials, add entry and fully stir into unguinosus pug;

(3) the adding whipping agent and the back casting that stirs are adobe in pug, drying;

(4) with dried adobe loading of kiln sintering, sintering temperature rises to 1300-1400 ℃, is incubated 5-10 hour;

(5) kiln discharge and make desired finished product.

The lime feldspar of producing according to the method described above is in conjunction with mullite brick, and its crystal phase structure is principal crystalline phase with the mullite, and lime feldspar is in conjunction with phase, Al in the goods ₂O ₃Content be more than 55%.

In the manufacture method of lime feldspar of the present invention in conjunction with mullite brick, in kyanite, add α-Al ₂O ₃And flint clay.With the kyanite is main as introducing Al ₂O ₃Raw material, have following advantage, at first the Al of kyanite ₂O ₃Content higher, help the raising of goods maximum operation (service) temperature, oxide impurity Fe ₂O ₃Content low, be generally less than 0.2%, harmful effect is little; The second, add α-Al ₂O ₃Be significantly to improve Al ₂O ₃The effective ways of content, indexs such as the refractoriness of so further enhancing finished product and thermal shock resistance; The 3rd, flint clay is the natural hard clay, contains Al equally ₂O ₃, the more important thing is it as a kind of agglutinant, not only help improving product intensity and yield rate, and reduced the mullite formation temperature, can realize sintering in advance, thereby reduce sintering energy consumption effectively.Repetition test shows that when temperature of combustion was 1100 ℃, kyanite just began to decompose, begin to decompose to 1200 ℃ of a large amount of kyanites, mullite begins to occur, and kyanite all decomposes in the time of 1300 ℃, at this moment in the X-ray diffraction spectral line based on mullite, a spot of lime feldspar also occurs.

The component white cement is a kind of hydraulic cementing materials of low iron-holder, wide material sources, and cost is low, white cement is as the raw material of introducing CaO among the present invention, and it can make full use of sintering and to form the volume density of lime feldspar crystalline phase little, and thermal conductivity is low, the advantage that antistrip performance is good improves quality of finished; Improved the intensity of brick green compact again effectively, yield rate improves, and is simple.And the introducing of a small amount of CaO has also promoted the carrying out of sintering and reaction.Adding white cement and water fully stir into ointment mud shape in the powder, and not only the green compact quality is good behind the shaping and drying, and makes things convenient for green compact to move, and the use of whipping agent has further reduced the weight/power ratio of goods again, guarantee to produce the light-weight refractory materials.

The refractory brick that makes according to the method described in the present invention is principal crystalline phase owing to formed with the mullite, and lime feldspar is the finished bricks in conjunction with phase, and it has the advantage that lime feldspar goods thermal conductivity is low, specific tenacity is high, antistrip performance is strong; Has the use temperature height again, good thermal shock, the characteristics of long service life.

Further specify the embodiment of the invention 1 below in conjunction with embodiment.

Manufacture method of the present invention comprises following several steps:

With kyanite, α-Al ₂O ₃, flint clay and white cement prepare burden as following weight percent, wherein kyanite 80%, α-Al ₂O ₃10%, flint clay 2%, white cement 8%.Add α-Al again after at first kyanite, flint clay being broken into particle ₂O ₃Mixer mill is fine into powder, powder fineness 0.044mm (320 order), in this powder, add cement and water, be stirred well to the ooze paste, in this ointment shape pug, add whipping agent again---admixtures commonly used such as rosined soap and water reducer, green compact toughener, and after stirring, casting is green compact, with further raising green compact quality.Green compact natural curing at room temperature 24 hours makes the abundant aquation of white cement, carries out 110 ℃ oven dry then in dry kiln, and drying time 72 hours makes the brick green compact produce higher intensity, so that carrying and loading of kiln.Loading of kiln is baked, and 1400 ℃ of firing temperatures are incubated 5 hours, and the blank that burns till is cut and finish grindes by setting size, just obtains desired finished bricks after check.

Embodiment 2

Repeat embodiment 1 by described same steps as, but kyanite, α-Al ₂O ₃, flint clay and white cement weight percent be respectively 83%, 9%, 2%, 6%, the powder fineness is 0.053mm (270 order), whipping agent adopts rosined soap and NaOH mixture, its both ratios are 10: 1.1350 ℃ of firing temperatures, soaking time 8 hours.

Embodiment 3

Repeat embodiment 1 by described same steps as, but kyanite, α-Al ₂O ₃, flint clay and white cement weight percent be respectively 84%, 5%, 6%, 5%, the powder fineness is 0.036mm (400 order).

Embodiment 4

Repeat embodiment 1 by described same steps as, but kyanite, α-Al ₂O ₃, flint clay and white cement weight percent be respectively 90%, 3%, 3%, 4%.The powder fineness is 0.036mm (400 order).

Embodiment 5

Repeat embodiment 1 by described same steps as, but kyanite, α-Al ₂O ₃, flint clay and white cement weight percent be respectively 92%, 2%, 3%, 3%.

The finished bricks physical and chemical index test result of the foregoing description 1---embodiment 5 is listed as follows:

Claims (6)

1, a kind of lime feldspar is characterized in that in conjunction with the manufacture method of mullite brick it comprises following step:

(1) with the screening of kyanite and flint clay broken and with α-Al ₂O ₃Mixer mill is fine into powder;

(2) in above-mentioned grinding batching, add white cement, form mixture, its kyanite α-Al ₂O ₃, flint clay and white cement weight consist of:

Kyanite 80-92%

α-Al ₂O ₃ 2-10％

Flint clay 2-6%

White cement 3-8%

In above-mentioned raw materials, add entry and fully stir into unguinosus pug;

(3) the adding whipping agent and the back casting that stirs are adobe in pug, drying;

(4) with dried adobe loading of kiln sintering, sintering temperature rises to 1300-1400 ℃, is incubated 5-10 hour;

(5) kiln discharge and make desired finished product.

2, method according to claim 1 is characterized in that: kyanite, α-Al ₂O ₃With the fineness of flint clay mixed powder be 0.036-0.053mm.

3, method according to claim 1 is characterized in that: the whipping agent that adds in the pug of ooze paste is rosined soap or rosined soap and NaOH mixture, and the blending ratio of rosined soap and NaOH is 10: 1.

4, method according to claim 1 adds water reducer and toughener when it is characterized in that adding whipping agent in pug.

5, method according to claim 1 is characterized in that: drying means is the oven dry of heating again after natural curing at room temperature or the natural curing.

6, the lime feldspar of producing according to claim 1 or 2 described methods is in conjunction with the mullite brick goods, and it is characterized in that: its crystal phase structure is principal crystalline phase with the mullite, and lime feldspar is in conjunction with phase, Al in the goods ₂O ₃Content be more than 55%.