CN103435315B - Method for preventing surface blistering of fly ash steam-pressing brisk - Google Patents

Method for preventing surface blistering of fly ash steam-pressing brisk Download PDF

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Publication number
CN103435315B
CN103435315B CN201310354346.7A CN201310354346A CN103435315B CN 103435315 B CN103435315 B CN 103435315B CN 201310354346 A CN201310354346 A CN 201310354346A CN 103435315 B CN103435315 B CN 103435315B
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unslaked lime
steam
pressure
fly ash
hours
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CN103435315A (en
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胡荣建
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Taiyuan Iron and Steel Group Co Ltd
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Taiyuan Iron and Steel Group Co Ltd
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Abstract

The invention discloses a method for preventing surface blistering of a fly ash steam-pressing brisk. According to the method, (1) the content of quick lime is more than or equal to 58 percent, the digestion time is less than or equal to 10 minutes, the digestion temperature is more than or equal to 50 DEG C, the particle size is less than 3mm, the requirement of size fraction content of which the particle size is less than 200 meshes is less than 15 percent; (2) sequentially batching fly ash, gravel, coarse residue and quick lime in a stirrer; (3) the compression molding parameters are that the moisture of the mixture is controlled to be 10+/-1 percent, the molding pressure of a brick making machine is 135+/-5 Bar, and the precompression is not less than 115Bar; (4) the curing condition requirements are that the steam-pressing steam pressure of a still kettle is gradually improved from 0 to 1.30+/-0.05Mpa within three hours; (5) constant temperature and constant pressure are kept within five hours, the pressure in the still kettle is 1.30+/-0.05Mpa, and the temperature is 180+/-5 DEG C. The test proves that the phenomena that the surface layer of the fly ash steam-pressing brisk is blistered and the size is out of tolerance are effectively controlled.

Description

A kind of method that prevents fly ash autoclaved brick surface blistering
Technical field
The invention belongs to metallurgical solid waste comprehensive utilization of resources technology, novel energy-saving construction materials industry technology, be specifically related to a kind of method that prevents fly ash autoclaved brick surface blistering.
Background technology
Fly ash autoclaved brick is using flyash (comprising thick slag) as main raw material (volume is more than 60%), through Raw material processing, weight metering batching, the stirring and evenly mixing that adds water, compression moulding, make through steam pressure technique, it has the performances such as visual appearance is good, intensity is high, lightweight, can be widely used in building foundation and external and internal wall.Fly ash autoclaved brick is the desirable substitute products of solid clay brick.Fly ash autoclaved brick deadweight is lighter than solid clay brick more than 20%, and its heat insulation effect can exceed 1.5 times of solid clay bricks, and Main physical mechanical property is better than traditional solid clay brick, is China's Novel energy-saving wall of building material.
In process of production, unslaked lime is as agglutinate for fly ash autoclaved brick, and it is mainly that fly ash autoclaved brick is played to consolidation and sclerosis.Due to addition of the inner raw burn amount of unslaked lime large, oxidation rate is slow, calcium carbonate cannot decompose completely in limited digestion time, its heat also just cannot discharge completely.Often cause fly ash autoclaved brick after pressure forming, in the steam-cured process of autoclave High Temperature High Pressure, residue calcium carbonate continues to decompose release of heat, and molding blank volume increases.Therefore, cause the phenomenon of fly ash autoclaved brick top layer blistering, dimension overproof.Be that fly ash autoclaved brick finished product is after steam pressure technique completes, there is crisscross fine cracks fly ash autoclaved brick surface, the not enough 1mm of crack width conventionally, and length is between 15-30 mm, fly ash autoclaved brick apparent size exceeds deviation+4 mm scope, forms the process of waste product.
Summary of the invention
In order to improve fly ash autoclaved brick product qualified rate; Reduce production costs, the present invention proposes a kind of method that prevents fly ash autoclaved brick surface blistering.
The manufacture method of described fly ash autoclaved brick is: the manufacture method of described fly ash autoclaved brick is: measure respectively by hopper weighing balance, according to part by weight: flyash is 48%, and rubble is 20%, and unslaked lime is 12%, thick slag is 20%, one pot of siccative total stuff amount 5800 ± 200Kg of every stirring; Above-mentioned batching is entered to stirrer and add water and mix, add the water yield to be controlled between every pot of 650 ± 20 Kg, making the water ratio that puts in storage is 11 ± 1% compounds; Then through slaking silos digestion completely, finally by hydraulic brick making machine by compound compression moulding, molding blank is organized into groups into steaming after piling, becomes the finished product after middle pressure steam is steam-cured.
A kind of method that prevents fly ash autoclaved brick surface blistering: it is characterized in that:
1, unslaked lime raw materials quality index request: effective CaO content >=58%, digestion time≤
10 minutes, digestion condition >=50 degree;
2, unslaked lime processing granularity requirements: after ball mill grinding, can not have the block thing of unslaked lime of granularity >=3mm, and granularity is greater than 200 orders (0.0875mm) grain size content and requires to be less than 15%;
3, stirrer batching order: first flyash blanking, secondly rubble, is then thick slag, is finally unslaked lime blanking; And then in stirrer, carry out siccative and be uniformly mixed 30 seconds, afterwards, on unslaked lime charge level, add enough water, the unslaked lime very first time is contacted with water, unslaked lime is fully cleared up.Add after enough water yields, carry out wet feed and be uniformly mixed, it is 50 seconds that churning time requires.
4, slaking silos environment: (1) obturation effect will be got well, prevents moisture evaporation, and mixture becomes dry, and unslaked lime cannot be cleared up completely in slaking silos.(2) slaking silos bulkhead is incubated with prolonging silk floss, prevents heat Quick diffusing, slows down unslaked lime oxidation rate.(3) slaking silos vision slit, discharge door are closed tightly, prevent from leaking out because of part in slaking silos, cause compound to form bulk and sticky storehouse.
5, pressure molding technique parameter request: (1) compound delivers from godown moisture controlled 10 ± 1%.(2) forming pressure set(ting)value is 135 ± 5 bar, and precompression is not less than 115 bar (10 bar=1Mpa).(3) mould frame distributing depth requires as 195 ± 5% of molding blank height.
6, autoclave curing condition requires: (1), in the time of 3 hours, is progressively increased to 1.30 ± 0.05Mpa by autoclave steam pressure vapor pressure by 0, during this period, with addition of a small amount of water, improves the moisture content in steam pressure steam at middle pressure steam.(2) keep 5 hours constant temperature and pressures, autoclave still internal pressure 1.30 ± 0.05Mpa, temperature is 180 ± 5oC.(3) last, in 2 hours, autoclave vapor pressure is down to 0 by voltage stabilizing state, can open autoclave outlet still door.(4) open outlet still behind the door, in still, naturally cooling 1.5 hours, avoids rapid heating and cooling, can go out still.
The present invention is through 200,000,000 fly ash steam-pressing brisk production chain tests of Taiyuan iron and steel (group), evidence: the phenomenon of fly ash autoclaved brick top layer blistering, dimension overproof has obtained effectively controlling.The product qualified rate of fly ash autoclaved brick by 2011 94.5% bring up to 2012 98.0%, for enterprise has created considerable economic benefit.
Embodiment
The present embodiment is in 200,000,000 fly ash steam-pressing brisk production chain tests of Taiyuan iron and steel (group).
The manufacture method of described fly ash autoclaved brick is: measure respectively by hopper weighing balance, according to part by weight: flyash is 48%, and rubble is 20%, and unslaked lime is 12%, thick slag is 20%, one pot of siccative total stuff amount 5800 ± 200Kg of every stirring; Above-mentioned batching is entered to stirrer and add water and mix, amount of water is controlled between every pot of 650 ± 20 Kg, and making water ratio is 11 ± 1% compounds; Then through slaking silos digestion completely, finally by hydraulic brick making machine by compound compression moulding, molding blank is organized into groups into steaming after piling, becomes the finished product after middle pressure steam is steam-cured.
A kind of method that prevents fly ash autoclaved brick surface blistering:
1, unslaked lime raw materials quality index request: effective CaO content >=58%, digestion time≤
10 minutes, digestion condition >=50 degree;
2, unslaked lime processing granularity requirements: after ball mill grinding, can not have the block thing of unslaked lime of granularity >=3mm, and little 200 orders (0.0875mm) grain size content that is greater than of granularity requires to be less than 15%;
3, stirrer batching order: first flyash blanking, secondly rubble, is then thick slag, is finally unslaked lime blanking; And then in stirrer, carry out siccative and be uniformly mixed 30 seconds, afterwards, on unslaked lime charge level, add enough water, the unslaked lime very first time is contacted with water, unslaked lime is fully cleared up.Add after enough water yields, carry out wet feed and be uniformly mixed, it is 50 seconds that churning time requires.
4, slaking silos environment: (1) obturation effect will be got well, prevents moisture evaporation, and mixture becomes dry, and unslaked lime cannot be cleared up completely in slaking silos.(2) slaking silos bulkhead is incubated with prolonging silk floss, prevents heat Quick diffusing, slows down unslaked lime oxidation rate.(3) slaking silos vision slit, discharge door are closed tightly, prevent from leaking out because of part in slaking silos, cause compound to form bulk and sticky storehouse.
5, pressure molding technique parameter request: (1) compound delivers from godown moisture controlled 10 ± 1%.(2) forming pressure set(ting)value is 135 ± 5 bar, and precompression is not less than 115 bar (10 bar=1Mpa).(3) mould frame distributing depth requires (195 ± 5) % for molding blank height.
6, autoclave curing condition requires: (1), in the time of 3 hours, is progressively increased to 1.30 ± 0.05Mpa by autoclave steam pressure vapor pressure by 0, during this period, with addition of a small amount of water, improves the moisture content in steam pressure steam at middle pressure steam.(2) keep 5 hours constant temperature and pressures, autoclave still internal pressure 1.30 ± 0.05Mpa, temperature is 180 ± 5oC.(3) last, in 2 hours, autoclave vapor pressure is down to 0 by voltage stabilizing state, can open autoclave outlet still door.(4) open outlet still behind the door, in still, naturally cooling 1.5 hours, avoids rapid heating and cooling, can go out still.

Claims (1)

1. one kind prevents the method for fly ash autoclaved brick surface blistering, the manufacture method of described fly ash autoclaved brick is: measure respectively by hopper weighing balance, according to weight percent: flyash is 48%, rubble is 20%, unslaked lime is 12%, thick slag is 20%, one pot of siccative total stuff amount 5800 ± 200Kg of every stirring; Above-mentioned batching is entered to stirrer and add water and mix, amount of water is controlled between every pot of 650 ± 20 Kg, and making the water ratio that puts in storage is 11 ± 1% compounds; Then through slaking silos digestion completely, finally by hydraulic brick making machine by compound compression moulding, molding blank is organized into groups into steaming after piling, becomes the finished product after middle pressure steam is steam-cured; It is characterized in that:
(1), unslaked lime raw materials quality index request: effective CaO content >=58%, digestion time≤10 minute, digestion condition >=50 degree;
(2), unslaked lime processing granularity requirements: after ball mill grinding, the particle diameter < 3mm of unslaked lime, and particle diameter is greater than 200 order grain size content requirements and is less than 15%;
(3), stirrer batching order: the firstth, flyash blanking, the secondth, rubble, the 3rd is thick slag, the 4th is unslaked lime blanking; And then in stirrer, on unslaked lime charge level, add enough water, the unslaked lime very first time is contacted with water, unslaked lime is fully cleared up;
(4), slaking silos are airtight, prevent moisture evaporation, mixture becomes dry, unslaked lime cannot be cleared up completely in slaking silos;
(5), slaking silos bulkhead is incubated with prolonging silk floss, prevents heat Quick diffusing, slows down unslaked lime oxidation rate;
(6), slaking silos vision slit, discharge door close tightly, prevents from leaking out because of part in slaking silos, causes compound to form bulk and sticky storehouse;
(7), pressure molding technique parameter request: mixture moisture is controlled at 10 ± 1%; Hydraulic brick press machine forming pressure set(ting)value is 135 ± 5 bar, and precompression is not less than 115 bar;
(8), mould frame distributing depth requires (195 ± 5) % for molding blank height;
(9), curing condition requires: (1), in the time of 3 hours, is progressively increased to 1.30 ± 0.05MPa by autoclave steam pressure vapor pressure by 0, during this period, with addition of a small amount of water, improves the moisture content in steam pressure steam at middle pressure steam;
(10), keep 5 hours constant temperature and pressures, autoclave still internal pressure 1.30 ± 0.05MPa, temperature is 180 ± 5 DEG C;
(11), in 2 hours, autoclave vapor pressure is down to 0 by voltage stabilizing state, can open autoclave outlet still door;
(12), open autoclave outlet still behind the door, avoid rapid heating and cooling, fly ash autoclaved brick naturally cooling 1.5 hours in still, can go out still.
CN201310354346.7A 2013-08-15 2013-08-15 Method for preventing surface blistering of fly ash steam-pressing brisk Active CN103435315B (en)

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