CN107555764B - Preparation method of glass batch - Google Patents
Preparation method of glass batch Download PDFInfo
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- CN107555764B CN107555764B CN201710864038.7A CN201710864038A CN107555764B CN 107555764 B CN107555764 B CN 107555764B CN 201710864038 A CN201710864038 A CN 201710864038A CN 107555764 B CN107555764 B CN 107555764B
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Abstract
The invention provides a preparation method of a glass batch, which comprises the following steps: a) conveying the dry powder raw materials to or lifting the dry powder raw materials into each raw material bin through a bucket elevator respectively; b) weighing each raw material in the raw material bin to a proportional amount by an electronic scale below the raw material bin; c) feeding the raw material components with the proportion into a pneumatic mixing and sending tank for pneumatic mixing to form a batch, and sending the qualified batch to a first intermediate bin; d) the batch materials in the first intermediate bin enter a forced mixer for mixing; the mixed batch falls into a second intermediate bin below the forced mixer. The preparation method meets the requirements of mixing the raw materials of the dry fine powder, reduces dust in the production process, improves the mixing efficiency and the mixing uniformity, and is very suitable for preparing special glass batch such as borosilicate.
Description
Technical Field
The invention relates to preparation of special glass, in particular to a preparation method of a glass batch.
Background
In recent years, with the development of science and technology and economy, the living standard of people's material culture has been improved, and the demand of all countries in the world on building houses and public buildings is higher and higher. A series of building fire codes are presented one after the other. Borosilicate glass with a low coefficient of thermal expansion (4X 10)-6) Good thermal stability, chemical stability, mechanical property, optical property and excellent processing property are distinguished in various fireproof glasses. However, in the production process of special glass such as borosilicate glass, the glass batch contains part of boride raw materials, including boron oxide, borax pentahydrate, anhydrous borax, boric acid and the like. Because higher melting temperature is required for melting boride raw materialsWhen the boride raw material is subjected to monovalent oxides such as water at high temperature, the volatilization of the boride is accelerated, so that the water cannot be introduced in the preparation process of the batch material in consideration of the condition, and the preparation method of the batch material is greatly different from that of the common glass batch material.
In recent years, along with the increasing of national economic strength and the increasing of the living standard of people, the requirements of the whole society on the safety of medicines are increasingly strict, so that higher requirements are put forward on the product quality of the medicine packaging industry. Borosilicate glass is mostly used for producing the traditional medicine packaging glass bottles in China, and the borosilicate glass has more and more extensive application on medicinal glass tubes and food packaging materials due to the chemical stability of the borosilicate glass. The prior domestic low borosilicate glass tube is mainly used for manufacturing the medical glass bottle, most bottle-making factories use domestic self-produced low borosilicate glass tubes as raw materials, and the domestic self-production of the medium borosilicate glass tube and the high borosilicate glass tube with better performance is less, and most of the glass tubes need to be imported.
Generally, in the production of ordinary glass, the batch mixture of adoption generally has certain moisture content, and the main objective is to make the raw materials mix effects such as homogenization and the flying of reduction raw materials more, and the existence of moisture can aggravate the volatilization of melting in-process boron, causes the loss of boron raw materials, finally influences glass quality. At present, the prices of raw materials such as boron oxide, borax, boric acid and the like are relatively high, and the volatilization of boride in batch materials greatly increases the cost of the raw materials of glass factories.
In the preparation process of the batch of the common glass plant, because the granularity of various raw materials is relatively large, and water is usually added in the mechanical mixing process to improve the uniformity of the batch, the mixed batch is usually conveyed to a kiln head bin by a belt conveyor and the like, and the melting problem in a kiln is considered for special glass such as borosilicate and the like, the granularity of the raw materials is relatively small, the raw materials contain no water basically, and some problems can occur in the traditional mixing and conveying mode.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a method for preparing a glass batch, which solves the problems of the prior art.
To achieve the above objects and other related objects, the present invention is achieved by the following technical solutions.
The invention provides a preparation method of a glass batch, which comprises the following steps:
a) conveying the dry powder raw materials to or lifting the dry powder raw materials into each raw material bin through a bucket elevator respectively;
b) weighing each raw material in the raw material bin to a proportional amount by an electronic scale below the raw material bin;
c) feeding the raw material components with the proportion into a pneumatic mixing and sending tank for pneumatic mixing to form a batch, and sending the qualified batch to a first intermediate bin;
d) the batch materials in the first intermediate bin enter a forced mixer for mixing; the mixed batch falls into a second intermediate bin below the forced mixer.
Preferably, SiO in the dry powdered raw materials2And is lifted into a corresponding raw material bin by a bucket elevator. Other dry powder raw materials are pneumatically conveyed to the raw material bins through a pneumatic conveying tank.
Preferably, the raw material bins can be distributed in rows or in a matrix type concentrated distribution. Preferably, the raw material bins are distributed in a matrix type centralized distribution mode.
Preferably, the glass is one of borate glass, TFT glass and glass fiber. More preferably, the glass is a borate glass.
More preferably, the borate glass comprises the following raw material components in percentage by weight:
SiO2 50～85％
Al2O3 0～15％
B2O3 0～15％
Na2O 0～15％
K2O 0～10％
CaO 0～10％
NaCl 0～2％。
preferably, the first and second electrodes are formed of a metal,the Al is2O3The content of (A) is 0.5-15%.
Preferably, B is2O3The content of (A) is 0.5-15%.
Preferably, the Na2The content of O is 0.5-15%.
Preferably, said K2The content of O is 0.5-10%.
Preferably, the content of CaO is 0.5-10%.
Preferably, the content of NaCl is 0.5-2%.
In the process of melting boride such as borax and boric acid in raw materials into borosilicate, the boride can be volatilized in a large amount when meeting water vapor, and in order to reduce the volatilization of boron, various raw materials are considered to be dry powder. The water content of each raw material is preferably not more than 3% by weight, more preferably not more than 2% by weight, still more preferably not more than 1% by weight, particularly preferably not more than 0.7% by weight.
Preferably, heating devices are arranged outside the raw material bins. The heating device is used for heating the dry material raw materials in the raw material bin. The heating device reduces or prevents the powder from absorbing water. The heated medium can be flue gas, water vapor or heat transfer oil.
Preferably, the electronic scale may be configured according to the amount and weighing manner of each raw material. More preferably, the electronic scale is one of an incremental scale, a decremental scale or a micro-scale.
Preferably, the particle size of each raw material component is less than or equal to 2mm, more preferably less than or equal to 1mm, further preferably less than or equal to 0.5mm, and particularly preferably less than or equal to 0.3 mm. Because the special glass (borate glass and the like) has high melting temperature, high melting difficulty and more volatile components compared with the common glass, the special glass (borate glass and the like) has finer granularity requirement compared with the common glass by considering that the material melting has close relation with the raw material granularity (the larger the raw material granularity is, the higher the melting temperature is and the longer the melting time is).
Preferably, the bottom of the first intermediate bin is provided with a rechecking electronic scale. The rechecking electronic scale rechecks the weight of the batch mixed by the pneumatic mixing and sending tank and sent to the first intermediate bin. To confirm the loss of batch during delivery. In general, the loss of the total weight of the feed components is controlled within the range of 5 wt%.
Preferably, the mixing in the forced mixer is to perform mechanical stirring type mixing on the pneumatically premixed batch, and the mixing uniformity of the batch is further improved by the forced stirring type mixing.
Preferably, the number of the pneumatic mixing and sending tanks is one or more. The raw material components are stirred, rolled and mixed by high-pressure gas in the pneumatic mixing and sending tank.
In the application, qualified batch refers to discharge without process abnormality, and unqualified batch refers to discharge when process abnormality exists. The process abnormity refers to the conditions of process pause, production fault or abnormal feeding.
Preferably, in c), the unqualified batch materials are sent to the first waste bin through a pneumatic mixing and sending tank.
The final batch is obtained in the second intermediate bin.
Preferably, qualified batch materials are conveyed to a kiln head storage bin through closed conveying equipment.
Preferably, off-spec batch material is dumped to a second scrap bin via a dumping conveyor.
Preferably, cullet is added to the qualified batch material and is conveyed to the kiln head storage bin along with the batch material, such as among the components entering the kiln head storage bin.
As described above, the method for preparing the glass batch of the present invention has the following beneficial effects:
the preparation method satisfies the mixing of the dry fine powder raw materials, reduces dust in the production process, improves the mixing efficiency and the mixing uniformity, and is very suitable for preparing special glass batch materials such as borosilicate and the like.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It is to be understood that the processing equipment or apparatus not specifically identified in the following examples is conventional in the art.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention does not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between these explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
The embodiment of the invention provides a preparation method of a glass batch, which comprises the following steps:
the dry powder raw materials are respectively conveyed to or lifted into each raw material bin through a bucket elevator by a pneumatic conveying tank;
weighing each raw material in the raw material bin to a proportional amount by an electronic scale below the raw material bin;
feeding the raw material components with the proportion into a pneumatic mixing and sending tank for pneumatic mixing to form a batch, and sending the qualified batch to a first intermediate bin; sending unqualified batch to a first waste bin;
the batch materials in the first intermediate bin enter a forced mixer for mixing; the mixed batch falls into a second intermediate bin below the forced mixer. The second intermediate bin is the final batch.
Conveying the qualified batch to a kiln head storage bin; and the unqualified batch materials are transported to a second waste bin by a transport conveyor.
Example 1
In the embodiment, the batch produced by the method is a batch of borate glass, and the borate glass comprises the following raw material components:
SiO2 75％
Al2O3 4％
B2O3 10％
Na2O 1％
K2O 4％
CaO 5％
NaCl 1％。
wherein SiO in dry powder raw materials2And is lifted into a corresponding raw material bin by a bucket elevator. Other dry powder raw materials are pneumatically conveyed to the raw material bins through a pneumatic conveying tank.
Seven raw material bins are distributed in a matrix type centralized manner.
The moisture content of each raw material component is less than or equal to 1 wt%. In the process of melting boride such as borax and boric acid in raw materials into borosilicate, the boride can be volatilized in a large amount when meeting water vapor, and in order to reduce the volatilization of boron, various raw materials are considered to be dry powder.
The granularity of each raw material component is less than or equal to 2 mm. Because the special glass (borate glass and the like) has high melting temperature, high melting difficulty and more volatile components compared with the common glass, the special glass (borate glass and the like) has finer granularity requirement compared with the common glass by considering that the material melting has close relation with the raw material granularity (the larger the raw material granularity is, the higher the melting temperature is and the longer the melting time is).
Heating devices are arranged outside the raw material bins. The heating device is used for heating the dry material raw materials in the raw material bin. The heating device reduces or prevents the powder from absorbing water. The heated medium can be flue gas, water vapor or heat transfer oil.
The number of the pneumatic mixing and sending tanks is two. The raw material components are stirred, rolled and mixed by high-pressure gas in the pneumatic mixing and sending tank.
Example 2
In the embodiment, the batch produced by the method is a batch of borate glass, and the borate glass comprises the following raw material components:
SiO2 65％
Al2O3 5％
B2O3 11％
Na2O 4％
K2O 5％
CaO 8％
NaCl 2％。
wherein SiO in dry powder raw materials2And is lifted into a corresponding raw material bin by a bucket elevator. Other dry powder raw materials are pneumatically conveyed to the raw material bins through a pneumatic conveying tank.
Seven raw material bins are distributed in a matrix type centralized manner.
The moisture content of each raw material component is less than or equal to 1 wt%. In the process of melting boride such as borax and boric acid in raw materials into borosilicate, the boride can be volatilized in a large amount when meeting water vapor, and in order to reduce the volatilization of boron, various raw materials are considered to be dry powder.
The granularity of each raw material component is less than or equal to 2 mm. Because the special glass (borate glass and the like) has high melting temperature, high melting difficulty and more volatile components compared with the common glass, the special glass (borate glass and the like) has finer granularity requirement compared with the common glass by considering that the material melting has close relation with the raw material granularity (the larger the raw material granularity is, the higher the melting temperature is and the longer the melting time is).
Heating devices are arranged outside the raw material bins. The heating device is used for heating the dry material raw materials in the raw material bin. The heating device reduces or prevents the powder from absorbing water. The heated medium can be flue gas, water vapor or heat transfer oil.
The number of the pneumatic mixing and sending tanks is two. The raw material components are stirred, rolled and mixed by high-pressure gas in the pneumatic mixing and sending tank.
Example 3
In the embodiment, the batch produced by the method is a batch of borate glass, and the borate glass comprises the following raw material components:
SiO2 70％
Al2O3 8％
B2O3 12％
Na2O 1％
K2O 4％
CaO 4％
NaCl 1％。
wherein SiO in dry powder raw materials2And is lifted into a corresponding raw material bin by a bucket elevator. Other dry powder raw materials are pneumatically conveyed to the raw material bins through a pneumatic conveying tank.
Seven raw material bins are distributed in a matrix type centralized manner.
The moisture content of each raw material component is less than or equal to 1 wt%. In the process of melting boride such as borax and boric acid in raw materials into borosilicate, the boride can be volatilized in a large amount when meeting water vapor, and in order to reduce the volatilization of boron, various raw materials are considered to be dry powder.
The granularity of each raw material component is less than or equal to 2 mm. Because the special glass (borate glass and the like) has high melting temperature, high melting difficulty and more volatile components compared with the common glass, the special glass (borate glass and the like) has finer granularity requirement compared with the common glass by considering that the material melting has close relation with the raw material granularity (the larger the raw material granularity is, the higher the melting temperature is and the longer the melting time is).
Heating devices are arranged outside the raw material bins. The heating device is used for heating the dry material raw materials in the raw material bin. The heating device reduces or prevents the powder from absorbing water. The heated medium can be flue gas, water vapor or heat transfer oil.
The number of the pneumatic mixing and sending tanks is two. The raw material components are stirred, rolled and mixed by high-pressure gas in the pneumatic mixing and sending tank.
The preparation method in the embodiments 1 to 3 reduces the generation of dust in the production process, and improves the mixing efficiency and the mixing uniformity.
The quality of the batch plays a key role in the quality of finished glass, and the uniformity of the batch is favorable for stabilizing subsequent production. The uniformity of the batch refers to the deviation degree of chemical components between two adjacent batches when the batch is taken out at regular intervals. The closer the analytical results between the batches are to the average, the better the homogeneity is indicated. The prior glass production line generally uses Na in batch2CO3The mean square error of the contents was used to calculate batch homogeneity. The smaller the mean square error is, the better the quality of the batch, whereas the larger the mean square error is, the worse the quality of the batch is.
The production method comprises the steps of working continuously for 24 hours, taking out the qualified mixed batch to a kiln head bin every 2 hours, and detecting Na in each batch2CO3The content of (A) is calculated as Na2CO3Mean square error of content. The mean square error of the original forced mechanical mixing mode is generally about 0.5, and the mean square error can be reduced to be below 0.2 by adopting the mode of pneumatic mixing and mechanical mixing in the application; meets the requirement of producing high-quality glass products.
The above examples are intended to illustrate the disclosed embodiments of the invention and are not to be construed as limiting the invention. In addition, various modifications of the methods and compositions set forth herein, as well as variations of the methods and compositions of the present invention, will be apparent to those skilled in the art without departing from the scope and spirit of the invention. While the invention has been specifically described in connection with various specific preferred embodiments thereof, it should be understood that the invention should not be unduly limited to such specific embodiments. Indeed, various modifications of the above-described embodiments which are obvious to those skilled in the art to which the invention pertains are intended to be covered by the scope of the present invention.
Claims (8)
1. A preparation method of a glass batch is characterized by comprising the following steps:
a) conveying the dry powder raw materials to or lifting the dry powder raw materials into each raw material bin through a bucket elevator respectively;
b) weighing each raw material in the raw material bin to a proportional amount by an electronic scale below the raw material bin;
c) feeding the raw material components with the proportion into a pneumatic mixing and sending tank for pneumatic mixing to form a batch, and sending the qualified batch to a first intermediate bin;
d) the batch materials in the first intermediate bin enter a forced mixer for mixing; the mixed batch materials fall into a second intermediate bin below the forced mixer; the second intermediate bin is the final batch; conveying the qualified final batch materials to a kiln head bin through closed conveying equipment; qualified final batch refers to discharge without process anomaly;
if the components entering the kiln head storage bin contain cullet, adding the cullet on the qualified batch, and conveying the cullet to the kiln head storage bin along with the batch;
the glass is borate glass; the borate glass comprises the following raw material components in percentage by weight: 50-85% of SiO20.5 to 15% of Al2O30.5 to 15% of B2O30.5 to 15% of Na2O, 0.5-10% of K2O, 0.5-10% of CaO and 0.5-2% of NaCl.
2. The production method according to claim 1, wherein the moisture content of each raw material component is 1 wt% or less.
3. The method according to claim 1, wherein a heating device is provided outside the plurality of raw material bins.
4. The method according to claim 1, wherein the particle size of each raw material component is 2mm or less.
5. The manufacturing method according to claim 1, wherein a rechecking electronic scale is provided at the bottom of the first intermediate bin.
6. The preparation method according to claim 1, wherein the raw material bins are distributed in a matrix type centralized distribution manner.
7. The method for preparing the water-based paint, according to claim 1, is characterized in that the number of the pneumatic mixing and sending tanks is one or more.
8. The method of claim 1, wherein in c) the off-spec batch materials are sent to the first reject bin via a pneumatic mix delivery tank.
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| US11912608B2 (en) | 2019-10-01 | 2024-02-27 | Owens-Brockway Glass Container Inc. | Glass manufacturing |
| CN112340964A (en) * | 2020-12-31 | 2021-02-09 | 河南省中联玻璃有限责任公司 | Efficient float glass production process |
| CN115321789A (en) * | 2022-06-30 | 2022-11-11 | 重庆国际复合材料股份有限公司 | Homogenizing device and process for high-capacity and high-uniformity glass fiber batch |
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| CN101891368A (en) * | 2010-07-04 | 2010-11-24 | 王增贵 | Glass granulated material as well as preparation method and application thereof |
| CN102276151A (en) * | 2011-05-16 | 2011-12-14 | 周涛 | Technological method for preparing LTCC (low temperature co-fired ceramic) amorphous glass ceramic powder with microwave plasma torch |
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| US8753993B2 (en) * | 2006-02-10 | 2014-06-17 | Corning Incorporated | Glass compositions having high thermal and chemical stability and methods of making thereof |
| CN205221908U (en) * | 2015-10-19 | 2016-05-11 | 珠海优特电力科技股份有限公司 | Batching system |
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|---|---|---|---|---|
| US8753993B2 (en) * | 2006-02-10 | 2014-06-17 | Corning Incorporated | Glass compositions having high thermal and chemical stability and methods of making thereof |
| CN101891368A (en) * | 2010-07-04 | 2010-11-24 | 王增贵 | Glass granulated material as well as preparation method and application thereof |
| CN102276151A (en) * | 2011-05-16 | 2011-12-14 | 周涛 | Technological method for preparing LTCC (low temperature co-fired ceramic) amorphous glass ceramic powder with microwave plasma torch |
| CN103172268A (en) * | 2013-04-11 | 2013-06-26 | 内江华原电子材料有限公司 | E glass fiber with low boron and low softening point, preparation method and application thereof |
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