Mud capable of reducing firing temperature and preparation method

Abstract

The invention discloses pug capable of reducing firing temperature and a preparation method. The pug comprises 20-30 parts of Jiangxi feldspar, 10-20 parts of Kefu soil, 10-20 parts of pyrophyllite, 20-30 parts of black clay, 20-30 parts of Zhangzhou kaolin, 10-20 parts of sericite, 3-7 parts of diopside powder and 2-3 parts of calcium fluoride, wherein the particle size of the diopside powder is smaller than 0.04 mm. When the pug is used for preparing a green body for firing, the firing temperature of the green body is reduced to 1140-1150 DEG C, so that the firing cost is better reduced, waste gas protection is reduced, and the environment is protected.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic clay materials, and in particular relates to a clay material capable of reducing firing temperature and a preparation method thereof. Background Art

[0002] Ceramic products have been used in all aspects of people's lives, from cups, bowls, and saucers to sanitary urinals, toilets and other utensils, and are inseparable from people's lives. Clay is the raw material for ceramic products. The clay formula generally includes feldspar, clay, kaolin, mica and other substances. The clay is mixed in a certain proportion to make a green body, and then fired to obtain ceramic products.

[0003] In the current industrialized firing process of sanitary ceramics, the firing temperature generally needs to be between 1180-1200°C to be successful. The clay materials with high firing temperatures will consume more fuel during the firing process, and more exhaust gas will be emitted after the fuel is burned, which is not conducive to environmental protection.

[0004] Therefore, under the premise of meeting the relevant standards of sanitary ceramics, adjusting the clay formula to lower its firing temperature has become a problem that people need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a clay material with a reduced firing temperature, which can reduce the firing temperature during later firing while meeting relevant standards for sanitary ceramics, thereby better protecting the environment.

[0006] In order to achieve the above purpose, the following technical solutions are adopted: A clay material for reducing firing temperature, calculated by weight: 20-30 parts of Jiangxi feldspar, 10-20 parts of Kefu clay, 10-20 parts of pyrophyllite, 20-30 parts of black clay, 20-30 parts of Zhangzhou kaolin, 10-20 parts of sericite, 3-7 parts of diopside powder, the particle size of the diopside powder is less than 0.04mm, and 2-3 parts of calcium fluoride.

[0007] By adopting the above technical scheme, the clay with the above composition and proportion is made into a ceramic body. When it is fired, it is found that a ceramic body with good performance can be fired at 1140-1150°C. Therefore, the clay made with the above composition and proportion has the effect of reducing the firing temperature of the body.

[0008] The reason for this effect is that the surface energy of calcium fluoride and diopside powder, as well as the difference in grain boundary energy between calcium fluoride and diopside powder polycrystalline sintered bodies, reduce the overall particle size of the green body and increase the surface area, thereby increasing the sintering driving force during the heating process, and the calcium fluoride mineralizer accelerates the reaction rate to reduce the firing temperature.

[0009] Furthermore, in parts by weight: 20 parts of Jiangxi feldspar, 11 parts of Kefu clay, 10 parts of pyrophyllite, 20 parts of black clay, 20 parts of Zhangzhou kaolin, 12 parts of sericite, 4 parts of diopside powder, and 3 parts of calcium fluoride.

[0010] Furthermore, the Kofu soil comprises, by weight: 0.25% CaO, 63.50% SiO 2 , 1.09%Fe 2 O 3 , 0.06% MgO, 0.04% TiO 2 , 23.15% Al 2 O 3 , 4.35% K 2 O, 0.12% Na 2 O, and the rest are impurities and loss on ignition.

[0011] Furthermore, by weight fraction: the Zhangzhou kaolin comprises: 0.04% CaO, 47.71% SiO 2 , 1.08%Fe 2 O 3 , 0.02% MgO, 0.09% TiO 2 , 35.93%Al 2 O 3 , 1.17%K 2 O, 0.01% Na 2 O, and the rest are impurities and loss on ignition.

[0012] Furthermore, by weight fraction: the Jiangxi feldspar comprises: 0.10% CaO, 73.45% SiO 2 , 0.23%Fe 2 O 3 , 0.11% MgO, 0.14% TiO 2 , 12.61%Al 2 O 3 , 7.09%K 2 O, 4.93% Na 2 O, and the rest are impurities and loss on ignition.

[0013] Another object of the present invention is to provide a method for preparing clay with a lower firing temperature. By using a corresponding clay formula for firing, the firing temperature is lowered and the operation is convenient.

[0014] A method for preparing a clay material with a reduced firing temperature, characterized in that it comprises the following steps: S1. Weigh and mix Jiangxi feldspar, Kefu clay, pyrophyllite, black clay, Zhangzhou kaolin, sericite, diopside powder with a particle size of less than 0.04 mm, and calcium fluoride according to proportion to obtain a mixture; S2, weighing part of the mixed material and adding water to make the water-to-material ratio 1:1, and then ball milling until the particles below 50 microns are more than 96%, to obtain a ball milled material; S3, filtering and removing iron from the ball mill to obtain primary mud, wherein the concentration of the primary mud is 350-360g / 200ml; S4, standing and evaporating until the mass of water in the initial mud is less than 5%, thereby obtaining final mud; S5, after the final slurry is made into a green body, it is dried at 110°C; S6. The dried green body is put into a kiln for firing at 1140-1150°C, and the finished product is obtained after being taken out of the kiln.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Diopside powder with a particle size of less than 0.04 mm and calcium fluoride are added to the conventional clay formula, and the proportions of other components are adjusted. The interaction between diopside powder with a particle size of less than 0.04 mm and calcium fluoride is utilized to reduce the firing temperature when the clay is later made into a green body for firing, thereby better protecting the environment. Implementation

[0016] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Unless otherwise specified, the raw materials and equipment selected by the present invention are all commercially available.

[0017] The specific composition of the Kofu soil mentioned in the present invention includes: 0.25% CaO, 63.50% SiO 2 , 1.09% Fe 2 O 3 , 0.06% MgO, 0.04% TiO 2 , 23.15% Al 2 O 3 , 4.35% K 2 O, 0.12% Na 2 O, and the rest are impurities and loss on ignition.

[0018] The specific composition of Zhangzhou kaolin mentioned in the present invention includes: 0.04% CaO, 47.71% SiO 2 , 1.08% Fe 2 O 3, 0.02% MgO, 0.09% TiO 2 , 35.93%Al 2 O 3 , 1.17%K 2 O, 0.01% Na 2 O, and the rest are impurities and loss on ignition.

[0019] The Jiangxi feldspar mentioned in the present invention comprises: 0.10% CaO, 73.45% SiO 2 , 0.23% Fe 2 O 3 , 0.11% MgO, 0.14% TiO 2 , 12.61%Al 2 O 3 , 7.09%K 2 O, 4.93% Na 2 O, the rest are impurities and loss on ignition Embodiment 1

[0020] A method for preparing a clay material with a reduced firing temperature comprises the following steps: Step 1: Weigh 20 kg of Jiangxi feldspar, 11 kg of Kefu soil, 10 kg of pyrophyllite, 20 kg of black clay, 20 kg of Zhangzhou kaolin, 12 kg of sericite, 4 kg of diopside powder with a particle size less than 0.04 mm, and 3 kg of calcium fluoride, and mix them to obtain a mixture; Step 2: Weigh 50 kg of the mixed material and 50 kg of water to make the water-to-material ratio 1:1, then mix the mixed material and water and perform ball milling until the particles below 50 microns account for more than 96%, thereby obtaining a ball milled material; Step 3: filtering and removing iron from the ball mill to obtain initial mud, wherein the concentration of the initial mud is 350-360 g / 200 ml; Step 4: Allow the initial mud to stand and evaporate until the mass of water in the initial mud is less than 5%, thereby obtaining the final mud; Step 5: After the final slurry is made into a green body, it is dried at 110°C; Step 6: Put the dried body into the kiln for firing at 1140-1150℃ and get the finished product. Embodiment 2

[0021] A method for preparing a clay material with a reduced firing temperature comprises the following steps: Step 1: Weigh 20 kg of Jiangxi feldspar, 10 kg of Kefu soil, 20 kg of pyrophyllite, 30 kg of black clay, 20 kg of Zhangzhou kaolin, 12 kg of sericite, 3 kg of diopside powder with a particle size less than 0.04 mm, and 2 kg of calcium fluoride, and mix them to obtain a mixture; Step 2: Weigh 50 kg of the mixed material and 50 kg of water to make the water-to-material ratio 1:1, then mix the mixed material and water and perform ball milling until the particles below 50 microns account for more than 96%, thereby obtaining a ball milled material; Step 3: filtering and removing iron from the ball mill to obtain initial mud, wherein the concentration of the initial mud is 350-360 g / 200 ml; Step 4: Allow the initial mud to stand and evaporate until the mass of water in the initial mud is less than 5%, thereby obtaining the final mud; Step 5: After the final slurry is made into a green body, it is dried at 110°C; Step 6: Put the dried body into the kiln for firing at 1140-1150℃ and get the finished product. Embodiment 3

[0022] A method for preparing a clay material with a reduced firing temperature comprises the following steps: Step 1: Weigh 30 kg of Jiangxi feldspar, 20 kg of Kefu soil, 10 kg of pyrophyllite, 20 kg of black clay, 30 kg of Zhangzhou kaolin, 10 kg of sericite, 3 kg of diopside with a particle size less than 0.04 mm, and 3 kg of calcium fluoride, and mix them to obtain a mixture; Step 2: Weigh 50 kg of the mixed material and 50 kg of water to make the water-to-material ratio 1:1, then mix the mixed material and water and perform ball milling until the particles below 50 microns account for more than 96%, thereby obtaining a ball milled material; Step 3: filtering and removing iron from the ball mill to obtain initial mud, wherein the concentration of the initial mud is 350-360 g / 200 ml; Step 4: Allow the initial mud to stand and evaporate until the mass of water in the initial mud is less than 5%, thereby obtaining the final mud; Step 5: After the final slurry is made into a green body, it is dried at 110°C; Step 6: Put the dried body into the kiln for firing at 1140-1150℃ and get the finished product.

[0023] Comparative Example 1: Compared with Example 1, no calcium fluoride was added in Comparative Example 1.

[0024] Comparative Example 2: Compared with Example 1, in Comparative Example 2, calcium fluoride is replaced by calcium chloride.

[0025] Comparative Example 3: Compared with Example 1, no diopside powder with a particle size less than 0.04 mm was added in Comparative Example 3.

[0026] Comparative Example 4: Compared with Example 1, in Comparative Example 4, the diopside powder with a particle size of less than 0.04 mm is replaced with talc.

[0027] On the premise of meeting relevant standards for finished products, Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to sintering tests to obtain Table 1.

[0028] Test items Firing temperature (unit: °C) Embodiment 1 1140-1150 Embodiment 2 1140-1150 Embodiment 3 1140-1150 Comparative Example 1 1200-1220 Comparative Example 2 1200-1220 Comparative Example 3 1200-1220 Comparative Example 4 1200-1220

[0029] By comparing Example 1 with Comparative Examples 1 to 4, it can be seen that when calcium fluoride and diopside powder with a particle size of less than 0.04 mm interact with each other in the clay, the firing temperature is reduced during firing. That is to say, when the clay and green body are made and fired using the formula in Example 1, they can be fired at a lower firing temperature to obtain ceramic products that meet product requirements.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clay material that reduces the firing temperature. It is characterized in that Calculated by weight: 20-30 parts of Jiangxi feldspar, 10-20 parts of Kefu clay, 10-20 parts of pyrophyllite, 20-30 parts of black clay, 20-30 parts of Zhangzhou kaolin, 10-20 parts of sericite, 3-7 parts of diopside powder, the particle size of the diopside powder is less than 0.04mm, and 2-3 parts of calcium fluoride.

2. The clay material for reducing the firing temperature according to claim 1, It is characterized in that Calculated by weight: 20 parts of Jiangxi feldspar, 11 parts of Kefu clay, 10 parts of pyrophyllite, 20 parts of black clay, 20 parts of Zhangzhou kaolin, 12 parts of sericite, 4 parts of diopside powder, and 3 parts of calcium fluoride.

3. The clay material for reducing the firing temperature according to claim 1, It is characterized in that By weight: the Kofu soil includes: 0.25% CaO, 63.50% SiO 2 , 1.09% Fe 2 O 3 , 0.06% MgO, 0.04% TiO 2 , 23.15% Al 2 O 3 , 4.35% K 2 O, 0.12% Na 2 O, and the rest are impurities and loss on ignition.

4. The clay material for reducing the firing temperature according to claim 1, It is characterized in that By weight: the Zhangzhou kaolin includes: 0.04% CaO, 47.71% SiO 2 , 1.08% Fe 2 O 3 , 0.02% MgO, 0.09% TiO 2 , 35.93%Al 2 O 3 , 1.17%K 2 O, 0.01% Na 2 O, and the rest are impurities and loss on ignition.

5. A clay material for reducing the firing temperature according to claim 1, It is characterized in that By weight: the Jiangxi feldspar includes: 0.10% CaO, 73.45% SiO 2 , 0.23% Fe 2 O 3 , 0.11% MgO, 0.14% TiO 2 , 12.61%Al 2 O 3 , 7.09%K 2 O, 4.93% Na 2 O, and the rest are impurities and loss on ignition.

6. A method for preparing a clay material with a lower firing temperature, It is characterized in that The steps include: S1. Weigh and mix Jiangxi feldspar, Kefu clay, pyrophyllite, black clay, Zhangzhou kaolin, sericite, diopside powder with a particle size of less than 0.04 mm, and calcium fluoride according to proportion to obtain a mixture; S2, weighing part of the mixed material and adding water to make the water-to-mixture ratio 1:1, and then ball milling until the particles below 50 microns account for more than 96%, to obtain a ball milled material; S3, filtering and removing iron from the ball mill to obtain primary mud, wherein the concentration of the primary mud is 350-360g / 200ml; S4, standing and evaporating until the mass of water in the initial mud is less than 5%, thereby obtaining final mud; S5, after the final slurry is made into a green body, it is dried at 110°C; S6. The dried green body is put into a kiln for firing at 1140-1150°C, and the finished product is obtained after being taken out of the kiln.