CN112661484A - Preparation method of composite ball clay with firing whiteness not lower than 88% - Google Patents
Preparation method of composite ball clay with firing whiteness not lower than 88% Download PDFInfo
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- CN112661484A CN112661484A CN202011406040.8A CN202011406040A CN112661484A CN 112661484 A CN112661484 A CN 112661484A CN 202011406040 A CN202011406040 A CN 202011406040A CN 112661484 A CN112661484 A CN 112661484A
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Abstract
The invention discloses a method for preparing composite ball clay with the sintered whiteness of not less than 88%, which comprises the steps of screening slurry prepared from mansion kaolin and Guangdong Shaoyang black clay, removing impurities, doping ball grinding materials (Longyan first-grade porcelain stone and Liancheng bentonite), stripping and shearing to obtain slurry with the particle size distribution of-2 mu m and the content of more than 45%, carrying out filter pressing and dehydration on the slurry to obtain a mud cake with the water content of 28-30%, drying the mud cake and preparing into a circular block sample, calcining the prepared block sample at 1200 ℃ to obtain the whiteness of 88%, wherein the whole preparation process comprises the steps of pulping, magnetic separation, ball milling, compounding, stripping and the like, so that harmful impurities in minerals are effectively removed, the defects of low whiteness and the like of natural ball clay are overcome, and the ball clay has good plasticity through stripping, shearing and fusing the particle size distribution, Excellent molding performance, and high whiteness after firing.
Description
Technical Field
The invention relates to the field of ceramic raw materials, in particular to a preparation method of composite ball clay with the firing whiteness of not less than 88%.
Background
The most important characteristics of ball clay are high plasticity and good sintering properties, and these unique properties make ball clay widely used in the ceramic industry. The existing ball clay preparation method mostly adopts kaolin, coal gangue, quartz sand and the like as raw materials, and can not meet the requirements of low porosity, product mechanical property and the like of the vitrified tile. As described in the Chinese patent of invention CN103664133A, a water-washing ball clay special for high-grade ceramics and a production method thereof, raw materials for manufacturing the ball clay are required to be pressed into mud cakes after procedures of homogenization, flocculation and the like according to a certain proportion. The ball clay processed according to the method increases the manufacturing and processing cost, and has low purity, low strength and unstable performance. Therefore, the person skilled in the art can provide good green body forming performance by a method of compositely introducing plastic clay black mud and bentonite and improving plasticity, dry green body strength and the like through high-speed shearing, fused particle size distribution and the like.
Disclosure of Invention
In view of the above defects of the prior art, the technical problem to be solved by the invention is to prepare a preparation method of white composite ball clay with whiteness of not less than 88%, specifically by introducing various hydrous silicate minerals and a certain amount of alkali metal minerals as raw materials.
In order to realize the aim, the invention provides a preparation method of composite ball clay with the firing whiteness of not less than 88 percent, which comprises the following steps:
step 1, respectively putting kaolin and black mud into a stirring tank, adding water, and stirring to respectively obtain kaolin slurry and black mud slurry;
step 2, carrying out classified screening on the kaolin slurry and the black mud slurry;
step 3, carrying out iron removal, purification and impurity reduction processing on the kaolin slurry and the black mud slurry after the grading screening;
step 4, uniformly mixing the kaolin slurry obtained after iron removal, purification and impurity reduction processing and the black mud slurry in proportion, adding ball-milling fine material porcelain stone and ball-milling fine material bentonite, and uniformly stirring;
step 5, carrying out stripping processing on the slurry obtained after the composite stirring and uniform mixing;
step 6, dehydrating the slurry obtained by the flaking processing into mud cakes through a plate-and-frame filter press, and drying the mud cakes to prepare powder for whiteness detection;
and 7, preparing the powder into a round block sample, calcining, taking out the sample when the furnace temperature is reduced to room temperature, and testing by using a blue light whiteness tester to obtain the whiteness of the sample which is more than 88%.
Further, step 3 further comprises the following steps:
introducing the kaolin slurry and the black mud slurry into a permanent magnet high-gradient magnetic separator to obtain slurry after primary selection;
introducing the slurry obtained after the primary selection into an electromagnetic high-gradient magnetic separator to obtain the slurry after the fine selection;
and introducing the slurry obtained after the fine selection into a low-temperature superconducting magnetic separator to obtain the slurry after the special selection.
Further, after the kaolin slurry and the black mud slurry which are specially selected in the step 4 are doped, the porcelain stone and the bentonite are sequentially mixed according to the mass ratio of (70-80): (5-15): (1-5).
Further, the porcelain stone and the bentonite are doped into the kaolin slurry and the black mud slurry which are specially selected in the step 4, and the mass parts of the porcelain stone and the bentonite are 78:10:11:1 or 74:10:15:1 in sequence.
Further, in step 7, the round block samples were calcined at 1200 ℃ for 3 hours and held for 30 minutes.
Further, the screening in step 2 is performed by drum washing, classification by a spiral classifier, or tertiary classification by a cyclone.
Furthermore, the kaolin, the black mud, the porcelain stone and the bentonite are mansion kaolin, Guangdong Fuyang black mud, Longyan first-class porcelain stone and Liancheng bentonite in sequence.
Further, in the step 2, the kaolin slurry and the black mud slurry are subjected to classified screening to obtain slurry with the particle size of-45 μm.
Further, in the step 5, the slurry obtained after the composite stirring and uniform mixing is subjected to flaking processing to obtain slurry with the particle size of-2 microns and the content of more than 45%.
Further, in the step 6, the slurry obtained by the stripping processing is dehydrated into the mud cake with the water content of 28-30% through a plate-and-frame filter press.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
(1) the invention obtains the pulp with the grain diameter of minus 2 mu m and the content of more than 45 percent through the processing steps of screening pulp prepared by mansion kaolin and Guangdong Shaoyang black mud, removing iron and reducing impurities, mixing and doping Longyan first-grade porcelain stone and Liancheng bentonite, high-speed shearing by a stripping machine, fusing the grain size distribution and the like, dehydrating the slurry after the composite stripping into mud cakes with the water content of 28-30% by a plate-and-frame filter press, drying the mud cakes, pulverizing, pressing and molding to prepare circular block samples, calcining the circular block samples at 1200 ℃ for 3 hours, keeping the temperature for 30 minutes, taking out the samples when the furnace temperature is reduced to room temperature, testing by a blue light whiteness instrument to obtain a blue light whiteness value of more than 88%, the ceramization effect of the ball clay is improved by compositely introducing various hydrated silicate minerals and a certain amount of alkali metal minerals, and the plasticity and the dry blank strength of the ball clay are improved by adding bentonite and black mud. The invention adopts the processes of fusion, compounding, shearing and the like to prepare the composite ball clay, realizes that the composite ball clay has excellent properties of good plasticity, forming performance, firing whiteness and the like, can improve the formability of the porcelain clay glaze, is more beneficial to the processing processes of turning blank, grouting, ceramic forming and the like, is an important raw material for producing high-grade porcelain and ceramic tile, and can be widely applied to the ceramic industry.
(2) The iron removal and whitening processing of the invention further improves the whiteness of the ball clay by the synergistic effects of permanent magnet high-gradient roughing, electromagnetic high-gradient fine selection, low-temperature superconducting high-gradient fine selection and the like.
(3) The ceramic effect and plasticity of the ball clay are further improved by proper proportion of the composite formula of a plurality of materials.
The conception, the specific structure, and the technical effects produced by the present invention will be further described below to fully understand the objects, the features, and the effects of the present invention.
Detailed Description
The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
The invention provides a preparation method of composite ball clay with the sintering whiteness of not less than 88 percent, which comprises the following steps,
step 1: respectively putting the mansion kaolin and the Guangdong uncovering black mud into a stirring tank, adding water and stirring to obtain slurry;
step 2: and introducing the slurry into the slurry of a spiral classifier, and screening the slurry through drum washing, classification of the spiral classifier or three-level classification of a swirler to obtain the slurry with the granularity of-325 meshes.
And step 3: purifying and impurity-removing the slurry after the classified screening; the method specifically comprises the following steps:
step 3.1: introducing the slurry into a permanent-magnet high-gradient magnetic separator to obtain slurry after rough separation;
step 3.2: introducing the roughly-selected slurry obtained in the step 3.1 into an electromagnetic high-gradient magnetic separator to obtain a carefully-selected slurry;
step 3.3: introducing the slurry obtained in the step 3.2 after the fine selection into a low-temperature superconducting magnetic separator to obtain fine selected slurry;
and 4, step 4: uniformly mixing the kaolin slurry and the black mud slurry obtained after iron removal, purification and impurity reduction processing according to a proportion, then adding ball-milling fine porcelain stone and ball-milling fine bentonite, and uniformly stirring, wherein the porcelain stone and the bentonite are respectively first-class Longyan porcelain stone and Liancheng bentonite, and the weight ratio of the four materials is 74:10:15:1 in sequence.
And 5: stripping the uniformly mixed slurry in the step 4 to obtain slurry with the particle size of-2 mu m and the content of more than 45%;
step 6: dehydrating the slurry obtained in the step 5 into mud cakes with the water content of 28-30% by a plate-and-frame filter press;
and 7: and calcining the mud dried cake at 1200 ℃ for 3 hours and preserving heat for 30 minutes to obtain a blue light whiteness value of 90.4%. The whiteness of the composite ball clay at different temperature points is characterized in the following table.
| Item | 1180℃ | 1200℃ | 1250℃ | 1280℃ | Remarks for note |
| Temperature gauge | 1192℃ | 1213℃ | 1267℃ | 1295℃ | |
| Temperature of temperature measuring ring | 1180℃ | 1200℃ | 1250℃ | 1280℃ | |
| Whiteness value ° | 87.3 | 90.4 | 86.9 | 85.1 |
The invention obtains the slurry with the granularity of-2 mu m and the content of more than 45 percent by screening, impurity removing and processing the slurry prepared by mansion kaolin, compounding and doping the first-class Longyan porcelain stone, Guangdong Shaoyang black mud, bentonite and the like, stripping and processing and the like, and obtains the slurry with the blue light whiteness value of 88 percent by drying, sample preparation and calcination in a set temperature range. The invention prepares the composite ball clay by a simple process, and simultaneously removes the weak magnetic impurities in the minerals by the synergistic effect of the permanent magnetic high-gradient roughing, the electromagnetic high-gradient concentrating and the low-temperature superconducting magnetic separator, the process is simple, the whiteness of the ball clay is further improved, and the production process of the composite ball clay is perfected.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A preparation method of composite ball clay with the sintering whiteness of not less than 88 percent is characterized by comprising the following steps:
step 1, respectively putting kaolin and black mud into a stirring tank, adding water, and stirring to respectively obtain kaolin slurry and black mud slurry;
step 2, carrying out classified screening on the kaolin slurry and the black mud slurry;
step 3, carrying out iron removal, purification and impurity reduction processing on the kaolin slurry and the black mud slurry after the grading screening;
step 4, uniformly mixing the kaolin slurry obtained after iron removal, purification and impurity reduction processing and the black mud slurry in proportion, adding ball-milling fine material porcelain stone and ball-milling fine material bentonite, and uniformly stirring;
step 5, carrying out stripping processing on the slurry obtained after the composite stirring and uniform mixing;
step 6, dehydrating the slurry obtained by the flaking processing into mud cakes through a plate-and-frame filter press, and drying the mud cakes to prepare powder for whiteness detection;
and 7, preparing the powder into a round block sample, calcining, taking out the sample when the furnace temperature is reduced to room temperature, and testing by using a blue light whiteness tester to obtain the whiteness of the sample which is more than 88%.
2. The method for preparing the composite ball clay with the fired whiteness of not less than 88 percent according to claim 1, wherein the step 3 further comprises the following steps:
introducing the kaolin slurry and the black mud slurry into a permanent magnet high-gradient magnetic separator to obtain slurry after primary selection;
introducing the slurry obtained after the primary selection into an electromagnetic high-gradient magnetic separator to obtain the slurry after the fine selection;
and introducing the slurry obtained after the fine selection into a low-temperature superconducting magnetic separator to obtain the slurry after the special selection.
3. The method according to claim 1, wherein the kaolin slurry, the black mud slurry, the china stone and the bentonite which have been specially selected in the step 4 are sequentially mixed in the following weight portions of (70-80): 5-15): 1-5.
4. The method for preparing the composite ball clay with the firing whiteness of not less than 88% according to claim 3, wherein the kaolin slurry and the black mud slurry which are specially selected in the step 4 are doped with the porcelain stone and the bentonite, and the mass ratio of the four materials is 78:10:11:1 or 74:10:15:1 in sequence.
5. The method for preparing a composite ball clay according to claim 1, wherein in step 7, the round pieces are calcined at 1200 ℃ for 3 hours and held for 30 minutes.
6. The method for preparing a composite ball clay having a fired whiteness of not less than 88% as claimed in claim 1, wherein the screening in step 2 is performed by drum washing, classification by a screw classifier or three-stage classification by a cyclone.
7. The method according to claim 1, wherein the kaolin, the black mud, the china clay and the bentonite are, in order, Kamamai kaolin, Guangdong Fuyang black mud, Longyan first-class china clay and Liancheng bentonite.
8. The method for preparing a composite ball clay according to claim 1, wherein the kaolin slurry and the black mud slurry are classified and screened in step 2 to obtain a slurry with a particle size of-45 μm.
9. The method for preparing the composite ball clay with the fired whiteness of not less than 88% as claimed in claim 1, wherein the slurry obtained by the composite stirring and uniform mixing in the step 5 is subjected to a flaking process to obtain the slurry with the particle size of-2 μm and the content of more than 45%.
10. The method for preparing composite ball clay with a calcined whiteness of not less than 88% as claimed in claim 1, wherein the slurry obtained by the flaking process in step 6 is dehydrated into the mud cake with water content of 28-30% by a plate and frame filter press.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114477952A (en) * | 2022-01-26 | 2022-05-13 | 佛山市南海科友陶瓷原料有限公司 | Preparation method of ball clay special for 75-degree white ultrathin building ceramic rock plate |
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| US20030027708A1 (en) * | 2001-07-18 | 2003-02-06 | Michael Ginn | Novel clay and products |
| CN101844913A (en) * | 2009-03-25 | 2010-09-29 | 广州市花都区梯面金鹏高岭土原料厂 | Preparation method of ball clay for high-grade sanitary appliance |
| CN103360030A (en) * | 2012-03-30 | 2013-10-23 | 黄崧基 | Method for producing high-plasticity ceramic kaolin (ball clay) by mine surface soil |
| CN103664133A (en) * | 2012-09-20 | 2014-03-26 | 宜昌久久鑫建筑材料有限公司 | Special washing ball clay for top-grade ceramics and production method thereof |
| CN106747269A (en) * | 2016-12-14 | 2017-05-31 | 广东格莱斯陶瓷有限公司 | A kind of preparation method of the special ultrawhite ball clay of high-end tiles |
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| CN108249886A (en) * | 2018-02-01 | 2018-07-06 | 厦门欣意盛非金属材料科技有限公司 | A kind of preparation method of ultrawhite ball clay |
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2020
- 2020-12-03 CN CN202011406040.8A patent/CN112661484A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20030027708A1 (en) * | 2001-07-18 | 2003-02-06 | Michael Ginn | Novel clay and products |
| CN101844913A (en) * | 2009-03-25 | 2010-09-29 | 广州市花都区梯面金鹏高岭土原料厂 | Preparation method of ball clay for high-grade sanitary appliance |
| CN103360030A (en) * | 2012-03-30 | 2013-10-23 | 黄崧基 | Method for producing high-plasticity ceramic kaolin (ball clay) by mine surface soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477952A (en) * | 2022-01-26 | 2022-05-13 | 佛山市南海科友陶瓷原料有限公司 | Preparation method of ball clay special for 75-degree white ultrathin building ceramic rock plate |
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