CN103342536A

CN103342536A - Preparation method of high alkaline shale sintered brick

Info

Publication number: CN103342536A
Application number: CN2013102604213A
Authority: CN
Inventors: 蹇守卫; 孔维; 周浩; 汪婷; 郅真真; 蔡礼雄; 王智; 陈露
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2013-06-26
Filing date: 2013-06-26
Publication date: 2013-10-09
Anticipated expiration: 2033-06-26
Also published as: CN103342536B

Abstract

The invention specifically relates to a preparation method of a high alkaline shale sintered brick. The preparation method comprises the following steps of: first, crushing aired high alkaline shale; adding pulverized coal with same fineness and stirring for 10-60 minutes at 60-80 DEG C; aging for 20-48 hours in an aging storeroom; extruding and forming in an extruder; maintaining a blank formed; and drying and sintering to obtain the anti-frost return shale sintered brick. The method provided by the invention has the advantages of simple process and good anti-frost return effect. The method further has the advantages that 1) no extra additives are added into a proportioning system, so that the process is concise and stable; 2) the blank used in high temperature and high humidity and acidic atmosphere on the one hand can reduce emission of harmful gases, and on the other hand, can use inferior sulphur coal, so that the application path of inferior resources in the field is expanded; and 3) a molten compact structure is formed on the surface through an eutectic evaporative substance, so that the channels through which harmful ions enter can be reduced, and therefore, the service life of the product can be prolonged, and the sintered brick has a certain decorative effect.

Description

A kind of preparation method of high-alkali shale vitrified brick

Technical field

The present invention is specifically related to a kind of preparation method of high-alkali shale vitrified brick, is mainly used in construction material.

Background technology

Vitrified brick or building block have that chemical stability is good, easy construction and cheap characteristics, be widely used in the town and country construction of China, the sintered clay brick of consumption maximum wherein, because the use of a large amount of clay bricks, the annual field of ruining that causes because baking bricks of China reaches more than 1,500,000 mu, serious threat China guarantee the red line in 1,800,000,000 mu of arable lands.Along with wall changes further implementing of policy, shale becomes the main raw material of substitute for clay, and its same coal gangue, flyash, river silt together become four big novel wall material raw materials.

China's shale brickmaking starts from the 60-70 age in 20th century, before this in Sichuan, Guizhou builds up a collection of brick field, a collection of brick field has also successively been built up in the Liuzhou in Guangxi, Baise, Guilin subsequently, in the 80-90 age in 20th century, ground such as Jiangsu, Zhejiang, Hubei and Hunan Provinces, Guangdong, Shandong, Shanxi, northeast, Tianjin have also built up the shale brick field; But some new problems have also appearred in the process of utilizing shale brickmaking, as: cause vitrified brick to return the problem of frost because the shale alkalinity is too high, had a strong impact on the application of shale vitrified brick, particularly under the requirement of new energy-saving and emission-reduction, the shale vitrified brick is gradually to porous, the direction of hollowization develops, its surface-area increases, it is even more serious to return white phenomenon, in general, mainly take to alleviate the white problem of returning of actual use in the construction stage by sealing effect, but because some shale alkalinity is too high, still there is hollowing during use, the several quality problems of cracking.

For addressing this problem, need aspect starting material, carry out requirement on the one hand, on the other hand, adopt special technology that alkalimetal ion is solidified in vitrified brick inside, also can play the anti-effect of returning frost.

Summary of the invention

The object of the present invention is to provide a kind of preparation method of high-alkali shale vitrified brick, it has, and technology is simple, anti-returns white good effectiveness.

The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of preparation method of high-alkali shale vitrified brick, it is characterized in that, earlier the high-alkali shale after the weathering is pulverized, add the coal dust of same fineness and in 60-80 ℃ hot water, stir 10-60min, enter ageing storehouse ageing 20-48h, extrusion moulding in forcing machine, the base substrate that obtains after the moulding carries out maintenance, and dry and sintering can obtain the anti-shale vitrified brick that returns frost.

Press such scheme, described high-alkali shale refers to K ₂O and Na ₂The shale of O total content 〉=3%.

Press such scheme, described high-alkali shale powder fineness is 0.125mm-0.25mm.

Press such scheme, described base substrate maintaining process is the base substrate that will obtain after the moulding in humidity is that 80-100%, temperature are maintenance 20-48h in 200-300 ℃, the environment of acid atmosphere.

Press such scheme, described acid atmosphere be the kiln tail gas by common process provide contain CO ₂Or CO ₂With SO ₃High-temperature gas.

Press such scheme, described drying process is to be that 0-20%, temperature are in the 100-250 ℃ of environment in humidity, through 8-10h, is cooled to room temperature.

Press such scheme, described sintering process is to carry out sintering in conventional tunnel furnace or the annular kiln, calcining temperature 1080-1200 ℃, and sintering time 7-13h.

Ultimate principle of the present invention is on the basis of normal sintering brick production technique, on the one hand, improve the fineness of shale raw material, and the technology of use heat agitated and ageing, increase the stripping of alkali such as K, Na in the shale raw material, on the other hand, increase the maintaining process of base substrate in hot and humid sour gas, make K, Na in the base substrate form lyotrope matter and return frost to the surface with water migration in base substrate stage and sour gas reaction, at last, make alkaline matter form fine and close eutectic melt substance in billet surface in the sintering stage by high temperature sintering; Thereby the solidified surface alkali ion forms the passage that hinders inner residual alkaline matter stripping on the one hand on the one hand, finally reaches the anti-purpose of returning frost.

The present invention has simple, the anti-effective advantage of frost of returning of technology.For example: 1) need in batching system, not add extra admixture, guarantee the succinct stable of technology; 2) use of base substrate in hot and humid and acid atmosphere can reduce noxious gas emission on the one hand, on the other hand, can use high sulphur coal inferior, enlarged the approach that resource inferior is used in the art; 3) passage that harmful ion enters has been reduced by the dense structure that the eutectic material forms fusion in the surface, can improve the work-ing life of product, and make it have certain decorative effect.

Embodiment

In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.

Embodiment 1:

Earlier with K ₂O content is 1% and Na ₂The high-alkali shale powder of O2% is broken to 0.125mm-0.25mm, add the coal dust of 0.125mm-0.25mm and in 60 ℃ hot water, stir 10min, enter ageing storehouse ageing 48h, extrusion moulding in forcing machine, the waste heat environment that the base substrate that obtains after the moulding provides at sintering oven (contains CO by what the kiln tail gas of common process provided ₂Or CO ₂With SO ₃High-temperature gas, down with) in controlling moisture be 100%, temperature is 300 ℃ of maintenance 20h, be 20% in humidity then, temperature is through 8h in 250 ℃ the environment, be cooled to room temperature, in conventional tunnel furnace, calcine, calcining temperature 1080-1200 ℃ (existing calcining temperature improves 30-50 ℃), sintering time are that the existing sintering time of 7-13h(has prolonged 1-3h), can be met and slightly return the shale vitrified brick that frost requires among the GB T2542.

Embodiment 2:

Earlier with K ₂O content is 3% and Na ₂The high-alkali shale powder of O2% is broken to 0.125mm-0.25mm, add the coal dust of 0.125mm-0.25mm and in 80 ℃ hot water, stir 10min, enter ageing storehouse ageing 20h, extrusion moulding in forcing machine, the base substrate that obtains after moulding controlling moisture in the waste heat environment that sintering oven provides is 80%, temperature is 200 ℃ of maintenance 48h, be 0% in humidity then, temperature is through 9h in 250 ℃ the environment, be cooled to room temperature, in conventional annular kiln, calcine, calcining temperature 1080-1200 ℃ (existing calcining temperature improves 30-50 ℃), sintering time is that the existing sintering time of 7-13h(has prolonged 1-3h), can be met and slightly return the shale vitrified brick that frost requires among the GB T2542.

Embodiment 3:

Earlier with K ₂O content is 2.5% and Na ₂The high-alkali shale powder of O1% is broken to 0.125mm-0.25mm, add the coal dust of 0.125mm-0.25mm and in 80 ℃ hot water, stir 10min, enter ageing storehouse ageing 30h, extrusion moulding in forcing machine, the base substrate that obtains after moulding controlling moisture in the waste heat environment that sintering oven provides is 90%, temperature is 250 ℃ of maintenance 36h, be 10% in humidity, temperature is through 10h in 250 ℃ the environment, be cooled to room temperature, in conventional annular kiln, calcine, calcining temperature 1080-1200 ℃ (existing calcining temperature improves 30-50 ℃), sintering time is that the existing sintering time of 7-13h(has prolonged 1-3h), can be met and slightly return the shale vitrified brick that frost requires among the GB T2542.

Claims

1. the preparation method of a high-alkali shale vitrified brick, it is characterized in that, earlier the high-alkali shale after the weathering is pulverized, add the coal dust of same fineness and in 60-80 ℃ hot water, stir 10-60min, enter ageing storehouse ageing 20-48h, extrusion moulding in forcing machine, the base substrate that obtains after the moulding carries out maintenance, and dry and sintering can obtain the anti-shale vitrified brick that returns frost.

2. according to the preparation method of the described high-alkali shale vitrified brick of claim 1, it is characterized in that: described high-alkali shale refers to K ₂O and Na ₂The shale of O total content 〉=3%.

3. according to the preparation method of the described high-alkali shale vitrified brick of claim 1, it is characterized in that: described high-alkali shale powder fineness is 0.125mm-0.25mm.

4. according to the preparation method of the described high-alkali shale vitrified brick of claim 1, it is characterized in that: described base substrate maintaining process is the base substrate that will obtain after the moulding in humidity is that 80-100%, temperature are maintenance 20-48h in 200-300 ℃, the environment of acid atmosphere.

5. according to the preparation method of the described high-alkali shale vitrified brick of claim 4, it is characterized in that: described acid atmosphere be the kiln tail gas by common process provide contain CO ₂Or CO ₂With SO ₃High-temperature gas.

6. according to the preparation method of the described high-alkali shale vitrified brick of claim 1, it is characterized in that: described drying process is to be that 0-20%, temperature are in the 100-250 ℃ of environment in humidity, through 8-10h, is cooled to room temperature.

7. according to the preparation method of the described high-alkali shale vitrified brick of claim 1, it is characterized in that: described sintering process is to carry out sintering in conventional tunnel furnace or the annular kiln, calcining temperature 1080-1200 ℃, and sintering time 7-13h.