CN1072913A

CN1072913A - Flyash brick and production technique

Info

Publication number: CN1072913A
Application number: CN 91110966
Authority: CN
Inventors: 刘荣明; 马尚文
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-12-02
Filing date: 1991-12-02
Publication date: 1993-06-09

Abstract

The building structure brick that flyash brick and production technique are made up of 100% flyash and the water glass of binder 3～5% that adds.Its production technique is that flyash is mixed with binding agent and compression moulding, and the adobe of moulding sinters brick into through progressively being warmed up to 950 ℃ ± 20 ℃ after the drying of chamber, tunnel.Make full use of flyash, made the higher building structure brick of intensity.

Description

Flyash brick and production technique

Flyash brick be with the ash behind the pulverized coal friring as material of main part, add the building structure brick that sodium silicate binder constitutes, its production technique is to adopt to mix the method that compacting sintering is produced the made from full fly ash brick.

The manufacture method of the full waste residue interior tile of the CN87101036B application for a patent for invention authorization specification sheets record of Chinese patent authorization on December 28th, 1988 bulletin, be that the high-content of flyash is 67%, be mixed into 100% base-material with 33% boron mud, add 0.2-0.5% organic or inorganic binding agent again and mix.Compound burns till under 1100-1230 ℃ of temperature through extrusion forming, and sintering temperature is higher, and it is bigger to consume energy.And the production method of the flyash brick of CN1046727A number (application number 89109395.8) record of state's invention patent application prospectus in November 7 nineteen ninety, it is made up of the flyash of 60-80% and lime powder or the carbide slag of 20-40%.Its base-material rolls into type through stirring, handles forming again through water glass (water glass) solution impregnation.Add an amount of water in the batching.Its sodium silicate solution proportioning is 2～10%, and best proportioning is at 3-8%.Its dipping time was at 10-30 hour.Make like this and contain a certain amount of sodium silicate binder in the brick, but content is micro-.Dipping time is long, and the production cycle is long.The flyash content of these two kinds of bricks is up to 67% or 80%, also need add the mineral binder bond more than or equal to 20%, and the utilization of fly ash rate is lower.

Purpose of the present invention provides the higher flyash brick of a kind of utilization of fly ash rate and is applicable to the production technique of flyash brick.

Flyash brick of the present invention is made up of flyash and binding agent.Be characterized in that flyash is 100%, as base-material, add the water glass of binder of the 3-5% of flyash, formation is by 100% flyash and add the flyash brick that water glass 3-5% constitutes.The water glass content that adds is preferably 4%.When water glass content is less than 3%, the flyash brick associativity of composition is bad, and water glass can not be distributed between all flyash, and intensity does not reach higher requirement, and sintering temperature will raise.Water glass content is more than 5%, and the cohesiveness increase is not remarkable, and it is bigger to increase cost, and not beneficial content is excessive.Such 100% fine coal base-material brick, its flyash content accounts for more than 95.24% of brick weight, has improved the utilization of fly ash rate greatly, also reduces material cost.Raw material types reduces, and no longer adopts raw materials such as clay, coal.Water glass not only guarantees the bonding strength of adobe in flyash brick of the present invention, behind sintering, the inner flyash conjugation of intensity brick has improved brick intensity greatly more.

For the flyash that makes all size all is fully used, the flyash in the coal-dust brick of the present invention can be by the fine particle of 65-70% less than 0.088mm, the middle particle of 15-25%0.88mm to 0.5mm, and 10-15% constitutes greater than the coarse particles flyash of 0.5mm.Like this, the flyash that contains the different size granularity in the brick is mutually combined, also strengthened the intensity of brick.

The production technique of flyash brick of the present invention still adopts flyash to mix with the binding agent that adds, and promptly 100% flyash is mixed with the water glass 3-5% that adds.With compound compression moulding, make adobe.Its production technology characteristic is through tunnel chamber drying, to sinter the shaping adobe into brick through progressively being warmed up to 950 ± 20 ℃ again.Adopt tunnel chamber drying,, and do not adopt seasoning adobe rapid drying.Can prevent that like this water glass and moisture content coexistence time in the adobe are longer, reduce the hydrolysis of water glass, guarantee the content of effective water glass, guarantee that the intensity of adobe reaches the intensity that sinters later brick into.The NaOH molecule that prevents hydrolysis is simultaneously moved to the adobe external surface internally, influences the sintering of adobe.Adobe rapid drying, moisture content fully evaporates, and also can prevent the moisture content elastic expansion, makes adobe crackle and generation internal stress occur.This production technique sintering temperature is 950 ± 20 ℃, and below 1000 ℃, sintering temperature is lower, and is capable of reducing energy consumption.This is because binding agent has adopted the water glass of eutectic.

For ease of the compression moulding of compound, and compacting adobe more closely, forming high-intensity brick, half-dried compression moulding is adopted in compression moulding, and water content is the 8-12% of flyash in the batch mixing.The pressure of compression moulding can significantly reduce like this, and can form high-density, high-intensity adobe.Generally be to add water, make water-content at 8-12% in the batch mixing process.Water-content can not make flyash fully all moistening less than 8% o'clock, was not easy to half-dried compression moulding.Water-content is greater than 12%, and the water yield is excessive, and water is squeezed in the fly ash grain when compacting.After the moulding, clamp-on the interior water of fly ash grain and ejected between particle by air again, easily make particle separation, cause adobe crackle and internal stress.The water that adds preferably is mixed into water glass earlier and releases liquid, diluent is mixed with flyash again.Diluent can make water glass composition and flyash thorough mixing even, water glass is evenly distributed on around the fly ash grain, and makes flyash fully moistening.For making between flyash bonded better, form the higher brick of intensity, preferably earlier in the larger particles in the flyash, coarse particles mixes with a part of water glass diluent, the water glass diluent of fine grain part in the flyash and remainder sneaked into after mixing again, mix.Like this, earlier with water glass diluent blended in, coarse particles flyash surface is moistening by water glass and water.During the fine powdered coal that the back adds just can distribute and be bonded at, coarse particles flyash is surperficial and they between.In, coarse particles flyash does the skeleton of brick, fine grain flyash is distributed between the skeleton as filling with mixing, and carse, medium and small three kinds of particle flyash are mixed evenly and at intervals.The batch mixing that forms is even, and compacting also is more prone to, and can form the engineering brick of even structure.

For making adobe dry rapidly in the tunnel chamber, do not make moisture content cross thermal evaporation again, impact the adobe internal structure, it is 100-120 ℃ that tunnel chamber drying preferably adopts the drying medium inlet temperature.As controlling the drying medium temperature out, can grasp between 50-70 ℃.The brick bat drying time is 36-48 hour like this.But finally be want brick bat drying to water content less than 2%, just can enter sintering.Adobe preferably earlier is heated to 150 ℃ with adobe at temperature-rise period progressively, again through progressively rising to 750 ℃ from 150 ℃, will burn refining after 750 ℃, and it is slower to heat up, and when reaching 950 ± 20 ℃ of top temperatures, keeps burning till after 4-6 hour.Eutectic after 750 ℃ in the flyash and water glass then begin to be liquid phase, and burning refining process afterwards between reaching among the fly ash grain of liquid phase part infiltration solid phase body, has increased the physicochemical property and the intensity of burnt brick.Process of cooling after burning till forms multinomial crystallization, the needle-like mullite intert in glass-ceramic matrix and a spot of phosphorus quartz in, the texture ratio of formation is more rigorous.Improve the intensity of finished bricks so greatly, and had higher acid and alkali-resistance, corrosion and weathering and heatproof to impact.

Compared with the prior art flyash brick of the present invention and production technique have utilized flyash fully, and flyash is all utilized, and just do not utilize certain composition wherein.Simultaneously do not re-use other brick producing materials such as clay, lime, reduce material cost greatly.Its brick proportion is less, is more suitable in building.Its brick anti-corrosion, heatproof is impacted and intensity all increases.Technological process is fairly simple, and tooling cost is lower, and particularly sintering temperature is lower, cuts down the consumption of energy.Technological process can make that brick body inner structure is even, density is high, has further increased the intensity of brick.

Further specify flyash brick of the present invention and production technique below in conjunction with embodiment.

1. get 500kg flyash, wherein less than the fine particle 350kg of 0.088mm, greater than thick, the middle particle 150kg of 0.088mm.Water intaking glass 20kg, 50kg again fetches water.

2. earlier water glass is added in the entry, be mixed into diluent.Thick, middle particulate flyash is put into stirrer, put into big 12kg diluent stirring and added fine grain flyash restir 1-2 minute after 1-2 minute.Diluent with remainder adds stirring 10 minutes at last, forms compound.

3. half-dried compound is put into brick pressing machine, repressed one-tenth adobe.

4. adobe is sent in the tunnel drier dry.Air 110 ± 10 ℃ of kiln inlet feedings.Through after 40 hours dryings, through check moisture content less than 2% o'clock, the dry end.

5. the exsiccant adobe is sent into and carried out sintering in the agglomerating chamber.Earlier adobe is warmed up to 150 ℃.Evenly rise to 750 ℃ from 150 ℃ through 400-480 minute, evenly rose to 950 ° ± 20 ℃ sintering that heat up through 225-270 minute from 750 ℃ again.And at 950 ± 20 ℃ of sintering through 250-300 minute.After sintering is intact, cease fire, after being cooled to 750 ℃ rapidly in 100-120 minute, slow again cool to room temperature takes out the flyash brick of making from agglomerating chamber.This fine coal brick is to be made of 100% flyash and 4% the water glass that adds.

Claims

1, flyash brick is made up of the binding agent of flyash and adding, it is characterized in that being made up of 100% flyash and the water glass 3～5% that adds.

2,, it is characterized in that the water glass that adds is 4% according to the said flyash brick of claim 1.

3,, it is characterized in that flyash is made up of greater than the coarse particles of 0.5mm the middle particle, 10～15% of 65～70% fine particles less than 0.088mm, 15～25% 0.088mm to 0.5mm according to claim 1 or 2 said flyash bricks.

4, the flyash brick production technique is:

A mixes flyash with the binding agent that adds,

B is compound compression moulding,

It is characterized in that:

The adobe of C moulding sinters into through progressively being warmed up to 950 ℃ ± 20 ℃ after the drying of tunnel chamber again.

5, according to the said flyash brick production technique of claim 4, it is characterized in that: half-open compression moulding is adopted in compression moulding, and the water content that adds in the batch mixing accounts for 8～12% of flyash.

6, according to the said flyash brick production technique of claim 5, it is characterized in that: the moisture content of wedding agent water glass and adding is mixed into diluent, mixes with flyash again.

7, according to the said flyash brick production technique of claim 6, it is characterized in that: earlier with in the flyash, coarse particles mixes with the part diluent, moistening in, the coarse particles side face, again the diluent of fine particle in the flyash and remainder is successively sneaked into.

8, according to claim 5 or 6 said flyash brick production technique, it is characterized in that: tunnel chamber drying medium inlet temperature is 100～120 ℃, and adobe is 36～48 hours in tunnel chamber time of drying.

9, according to the said flyash brick production technique of one of claim 4～7, it is characterized in that adobe progressively temperature-rise period be: be heated to 150 ℃ earlier, evenly rose to 750 ℃ through 400～480 minutes, evenly rose to 950 ℃ ± 20 ℃ sintering that heat up through 225～270 minutes from 750 ℃ again, and at 950 ℃ ± 20 ℃ behind 250～300 minutes sintering, be cooled to 750 ℃ rapidly through 100-120 minute, slow again cool to room temperature.

10, flyash brick production technique according to claim 8, it is characterized in that adobe progressively temperature-rise period be: be heated to 150 ℃ earlier, evenly rose to 750 ℃ through 400～480 minutes, evenly rose to 950 ℃ ± 20 ℃ sintering that heat up through 225～270 minutes from 750 ℃ again, and at 950 ℃ ± 20 ℃ behind 250～300 minutes sintering, be cooled to 750 ℃ rapidly through 100-120 minute, slow again cool to room temperature.