CN110577407A - Method for controlling sintering curve of antique city wall brick - Google Patents
Method for controlling sintering curve of antique city wall brick Download PDFInfo
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- CN110577407A CN110577407A CN201910887000.0A CN201910887000A CN110577407A CN 110577407 A CN110577407 A CN 110577407A CN 201910887000 A CN201910887000 A CN 201910887000A CN 110577407 A CN110577407 A CN 110577407A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/606—Drying
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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Abstract
the invention relates to the technical field of city wall bricks, and discloses a method for controlling a sintering curve of an antique city wall brick, which comprises the following steps: 1) setting a kiln: stacking the green bricks in a brick kiln; 2) moisture removal: drying and moisture removing treatment is carried out on the green bricks in the kiln; 3) and (3) heating: heating the bricks in the kiln, and controlling the heating speed; 4) and (3) sintering: continuously raising the temperature in the kiln; 5) kiln equalizing: maintaining a maximum temperature during the sintering phase; 6) reduction: and turning off the external fan and keeping the internal temperature. According to the method for controlling the sintering curve of the antique city wall brick, all-around sintering molding is carried out on green bricks of the antique city wall brick according to the steps of setting, removing moisture, heating, sintering, homogenizing and reducing, the time and the temperature of each flow are reasonably controlled, the optimal temperature-time ratio is formed, and the homogenizing link is added, so that the temperatures in each part of the kiln are consistent, the influence on the product quality due to the temperature difference is avoided, and the sintering qualification rate is improved.
Description
Technical Field
The invention relates to the technical field of city wall bricks, in particular to a method for controlling a sintering curve of an antique city wall brick.
Background
After the raw material mineral composition determination and thermal analysis tests are completed, the maximum allowable sintering temperature and the sintering temperature range are determined, and then a reasonable sintering curve can be determined according to actual conditions and experience.
The sintering curve is a curve showing the relationship between the firing temperature and the firing time. It comprises three stages of temperature rise, heat preservation and cooling (distinguishing the division of preheating, sintering, heat preservation and cooling zones in the operation of the kiln in the concept).
The firing curve of the qualified product can be obtained within the shortest sintering time (sintering period), which is called the optimal sintering curve. An optimal sintering curve exists for each raw material, but due to the limitation of a plurality of factors such as the structure of a kiln, a heating method, a stacking form and the like, the optimal sintering curve state is difficult to achieve in practical production. Only one reasonable sintering curve can be determined in connection with production practice. The reasonable sintering curve is the main basis of kiln design and sintering thermal regulation (including temperature, pressure, atmosphere, top-loading regulation and the like). The establishment of a reasonable sintering curve is related to the structure, the yield and the quality of the kiln, and has important practical meaning and economic benefit.
In practical application, the existing brickyard sintering curve is often neglected to be applied in order to improve the yield, so that a large amount of unqualified bricks are generated, and great economic loss is brought to enterprises.
disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for controlling a sintering curve of an antique city wall brick, which has the advantages of simple sintering process, accurate temperature control, high city wall brick forming rate and the like, and solves the problems of complex sintering process, undefined temperature control interval and low city wall brick forming rate in the past.
(II) technical scheme
In order to realize the purposes of simple sintering process, accurate temperature control and high urban wall brick forming rate, the invention provides the following technical scheme: a method for controlling a sintering curve of an antique city wall brick is characterized by comprising the following steps:
1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification;
2) moisture removal: drying and moisture removing treatment is carried out on the green bricks in the kiln;
3) And (3) heating: heating the bricks in the kiln, and controlling the heating speed;
4) And (3) sintering: continuously raising the temperature in the kiln, and sintering and molding the green bricks;
5) Kiln equalizing: keeping the highest temperature in the sintering stage, and carrying out temperature equalization treatment on the internal whole space;
6) Reduction: and (5) closing an external fan to form a closed environment in the brick kiln and keeping a certain temperature.
Preferably, in the moisture removing stage, the green bricks are subjected to slow heating treatment, the heating temperature is between room temperature and 200 ℃, the highest temperature is not more than two hundred ℃, and the moisture removing time is 30-40 h.
preferably, the temperature rise stage is used for carrying out temperature rise treatment on the temperature in the kiln, the temperature rise range is 200-700 ℃, and the duration time of the temperature rise stage is 40-50 h.
preferably, the temperature in the kiln is continuously heated in the sintering stage, the temperature interval is controlled to be 860-960 ℃, and the sintering time is 24-36 h.
preferably, the time of the kiln homogenizing stage is 4-6 hours, and the temperature of the kiln homogenizing stage is controlled at 850-900 ℃.
Preferably, the temperature of the reduction stage is 800-860 ℃ and the time of the reduction stage is 3.5-5 h.
(III) advantageous effects
Compared with the prior art, the invention provides a method for controlling a sintering curve of an antique city wall brick, which has the following beneficial effects:
according to the method for controlling the sintering curve of the antique city wall brick, all-around sintering molding is carried out on green bricks of the antique city wall brick according to the steps of setting, removing moisture, heating, sintering, homogenizing and reducing, the time and the temperature of each flow are reasonably controlled, the optimal temperature-time ratio is formed, and the homogenizing link is added, so that the temperatures in each part of the kiln are consistent, the influence on the product quality due to the temperature difference is avoided, and the sintering qualification rate is improved.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
a method for controlling a sintering curve of an antique city wall brick is characterized by comprising the following steps: 1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification; 2) moisture removal: carry out the dry processing of arranging the tide to the adobe in the kiln, arrange the tide stage and need carry out slow heat treatment to the adobe, the heating temperature is between room temperature to 200 degrees, the highest temperature is no longer than two hundred degrees, and arrange the tide time and be 30-40h, should use little fire at the intensification in-process, thereby slowly discharge the moisture of body, the temperature can not rise too fast, be close to the adobe of fire face, be heated more fast, cause inside and outside being heated inequality, thereby lead to the adobe to explode and split, and should also notice at row tide in-process: properly adjusting the frequency of the moisture exhaust fan, preventing moisture accumulation and avoiding moisture regain; 3) and (3) heating: heating the bricks in the kiln, controlling the heating speed, carrying out heating treatment on the temperature in the kiln in the heating stage, wherein the heating range is 200-; 4) and (3) sintering: continuously raising the temperature in the kiln, sintering and molding the green bricks, continuously heating the temperature in the kiln in the sintering stage, controlling the temperature interval to be 860-960 ℃, controlling the sintering time to be 24-36h, controlling the temperature in the sintering process within a specified range, and keeping for a period of time to basically mold the bricks; 5) kiln equalizing: keeping the highest temperature of the sintering stage, carrying out uniform temperature treatment on the internal whole space, wherein the time of the uniform kiln stage is 4-6 hours, the temperature of the uniform kiln stage is controlled at 850-; 6) reduction: and closing an external fan to form a closed environment in the brick kiln, keeping a certain temperature, keeping the temperature in the reduction stage at 800-860 ℃, keeping the time in the reduction stage at 3.5-5h, wherein the reduction stage aims to color the urban wall brick, and the brick body sintered under the condition of the whole layer is red, because the iron oxide is red due to the fact that the raw material contains the iron oxide, and is fused with the brick body after sintering, the iron oxide can be reduced into ferrous oxide through the reduction stage, the ferrous oxide is black, the required antique urban wall brick is produced through the subsequent 'water discharge' process, and the total time of the processes of setting the kiln, removing damp, heating, sintering, homogenizing the kiln and reducing is 5-7 days.
The first embodiment is as follows:
a method for controlling a sintering curve of an antique city wall brick comprises the following steps:
1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification;
2) Moisture removal: drying and moisture removing treatment is carried out on the green bricks in the kiln, and the moisture removing time is 30 hours;
3) and (3) heating: heating the bricks in the kiln, and controlling the heating speed, wherein the duration of the heating stage is 45 h;
4) and (3) sintering: continuously raising the temperature in the kiln, sintering and forming the green bricks, controlling the temperature interval to 860-960 ℃, and the sintering time to 24 hours;
5) Kiln equalizing: keeping the highest temperature of the sintering stage, and carrying out temperature equalization treatment on the internal whole space, wherein the time of the kiln equalization stage is 4 hours, and the temperature of the kiln equalization stage is controlled at 850-900 ℃;
6) Reduction: and closing the external fan to form a closed environment in the brick kiln, and keeping a certain temperature, wherein the temperature of the reduction stage is 800-860 ℃, and the time of the reduction stage is 3.5 h.
the forming time of the sintering curve is 96.5h, and the yield is 90%.
Example two:
A method for controlling a sintering curve of an antique city wall brick comprises the following steps:
1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification;
2) moisture removal: drying and dehumidifying the green bricks in the kiln, wherein the dehumidifying time is 36 h;
3) and (3) heating: heating the bricks in the kiln, and controlling the heating speed, wherein the duration of the heating stage is 50 h;
4) And (3) sintering: continuously raising the temperature in the kiln, sintering and forming the green bricks, controlling the temperature interval to 860-960 ℃, and the sintering time to 24 hours;
5) kiln equalizing: keeping the highest temperature of the sintering stage, and carrying out temperature equalization treatment on the internal whole space, wherein the time of the kiln equalization stage is 6 hours, and the temperature of the kiln equalization stage is controlled at 850-900 ℃;
6) reduction: and (3) closing an external fan to form a closed environment in the brick kiln, and keeping a certain temperature, wherein the temperature of the reduction stage is 800-860 ℃, and the time of the reduction stage is 4 h.
The forming time of the sintering curve is 120h, and the yield is 96%.
example three:
A method for controlling a sintering curve of an antique city wall brick comprises the following steps:
1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification;
2) moisture removal: drying and dehumidifying the green bricks in the kiln, wherein the dehumidifying time is 40 h;
3) And (3) heating: heating the bricks in the kiln, and controlling the heating speed, wherein the duration of the heating stage is 45 h;
4) And (3) sintering: continuously raising the temperature in the kiln, sintering and forming the green bricks, controlling the temperature interval to 860-960 ℃, and the sintering time to be 30 h;
5) kiln equalizing: keeping the highest temperature of the sintering stage, and carrying out temperature equalization treatment on the internal whole space, wherein the time of the kiln equalization stage is 4 hours, and the temperature of the kiln equalization stage is controlled at 850-900 ℃;
6) Reduction: and (3) closing an external fan to form a closed environment in the brick kiln, and keeping a certain temperature, wherein the temperature of the reduction stage is 800-860 ℃, and the time of the reduction stage is 4 h.
The forming time of the sintering curve is 123h, and the yield is 95.8%.
the invention has the beneficial effects that: according to the method for controlling the sintering curve of the antique city wall brick, all-around sintering molding is carried out on green bricks of the antique city wall brick according to the steps of setting, removing moisture, heating, sintering, homogenizing and reducing, the time and the temperature of each flow are reasonably controlled, the optimal temperature-time ratio is formed, and the homogenizing link is added, so that the temperatures in each part of the kiln are consistent, the influence on the product quality due to the temperature difference is avoided, and the sintering qualification rate is improved.
although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A method for controlling a sintering curve of an antique city wall brick is characterized by comprising the following steps:
1) setting a kiln: stacking the green bricks in a brick kiln, and arranging the green bricks in a staggered arrangement and inclined plane alignment mode according to the product specification;
2) Moisture removal: drying and moisture removing treatment is carried out on the green bricks in the kiln;
3) And (3) heating: heating the bricks in the kiln, and controlling the heating speed;
4) And (3) sintering: continuously raising the temperature in the kiln, and sintering and molding the green bricks;
5) kiln equalizing: keeping the highest temperature in the sintering stage, and carrying out temperature equalization treatment on the internal whole space;
6) Reduction: and (5) closing an external fan to form a closed environment in the brick kiln and keeping a certain temperature.
2. The method for controlling the sintering curve of the antique city wall brick according to claim 1, wherein the moisture removal stage is carried out by slowly heating the green brick at room temperature to 200 ℃, the maximum temperature is not more than two hundred degrees, and the moisture removal time is 30-40 h.
3. the method for controlling the sintering curve of the antique city wall bricks according to claim 1, wherein the temperature rise stage is used for raising the temperature in the kiln, the temperature rise range is 200-700 ℃, and the duration of the temperature rise stage is 40-50 h.
4. The method for controlling the sintering curve of the antique city wall brick as claimed in claim 1, wherein the temperature in the kiln is continuously heated in the sintering stage, the temperature range is controlled to 860-960 ℃, and the sintering time is 24-36 h.
5. the method for controlling sintering curve of antique city wall bricks according to claim 1, wherein the time of the kiln homogenizing stage is 4-6 hours, and the temperature of the kiln homogenizing stage is controlled at 850-900 ℃.
6. the method as claimed in claim 1, wherein the temperature of the reduction stage is 800-.
7. The method for controlling the sintering curve of the antique city wall bricks according to claim 1, wherein the total time of the procedures of setting kiln, removing moisture, raising temperature, sintering, homogenizing kiln and reducing is 5-7 days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910887000.0A CN110577407A (en) | 2019-09-19 | 2019-09-19 | Method for controlling sintering curve of antique city wall brick |
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| CN201910887000.0A CN110577407A (en) | 2019-09-19 | 2019-09-19 | Method for controlling sintering curve of antique city wall brick |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0335735A2 (en) * | 1988-03-31 | 1989-10-04 | Ngk Insulators, Ltd. | A process for firing ceramic shaped bodies and a tunnel kiln used therefor |
| CN1041441A (en) * | 1988-09-21 | 1990-04-18 | 龙怀安 | Verticle furnace of kiln |
| CN1101026A (en) * | 1993-07-31 | 1995-04-05 | 杨兆安 | Method for production of blue brick and tile by using tunnel kiln |
| CN104129972A (en) * | 2014-07-23 | 2014-11-05 | 赵逸川 | Preparation method of high-efficiency energy-saving fly ash sintered brick |
| CN108238787A (en) * | 2016-12-23 | 2018-07-03 | 湘潭智联技术转移促进有限责任公司 | A kind of gold brick modelled after an antique and preparation method thereof |
-
2019
- 2019-09-19 CN CN201910887000.0A patent/CN110577407A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0335735A2 (en) * | 1988-03-31 | 1989-10-04 | Ngk Insulators, Ltd. | A process for firing ceramic shaped bodies and a tunnel kiln used therefor |
| CN1041441A (en) * | 1988-09-21 | 1990-04-18 | 龙怀安 | Verticle furnace of kiln |
| CN1101026A (en) * | 1993-07-31 | 1995-04-05 | 杨兆安 | Method for production of blue brick and tile by using tunnel kiln |
| CN104129972A (en) * | 2014-07-23 | 2014-11-05 | 赵逸川 | Preparation method of high-efficiency energy-saving fly ash sintered brick |
| CN108238787A (en) * | 2016-12-23 | 2018-07-03 | 湘潭智联技术转移促进有限责任公司 | A kind of gold brick modelled after an antique and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 周张健 等: "《无机非金属材料工艺学》", 31 January 2010, 中国轻工业出版社 * |
| 江红辉 等: "《节能技术实用全书 上》", 31 December 1993, 中国科学技术文献出版社 * |
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Application publication date: 20191217 |
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