CN111792843B - Langhong ceramic glaze capable of contacting with food and preparation method thereof - Google Patents
Langhong ceramic glaze capable of contacting with food and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a Langhong ceramic glaze capable of contacting with food, which adopts natural minerals and chemical raw materials which do not contain toxicity to human bodies and environment, and respectively obtains ground glaze and overglaze through the procedures of proportioning, wet ball milling and sieving according to certain raw material composition mass percentage; applying base coat on the ceramic green body by using a glaze spraying method, and applying overglaze by using a glaze spraying method after drying; and firing the glazed ceramic green body at 1330-1350 ℃ by adopting a firing system of raising the temperature in an oxidizing atmosphere, then carrying out strong reduction and then carrying out weak reduction, thus obtaining the novel Langhong ceramic glaze capable of contacting with food. The invention realizes the preparation of the ceramic Langhong ceramic glaze without toxic elements to human bodies, thereby solving the practical application problem of the ceramic Langhong ceramic glaze in ceramic products which can contact with food. The preparation method is simple and easy to implement, can meet the requirement of environmental protection, has low production cost, and is suitable for large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of traditional ceramic material manufacturing, in particular to a Langhong ceramic glaze capable of contacting with food and a preparation method thereof.
Background
The Langhong glaze is also called as bovine blood red, originates from the early Jingdezhen of the Qing Dynasty, and is one of the traditional rare copper red glazes in China with the most bright color. The Chinese has the tradition of using red as noble, modesty and festive color from ancient to present, and is used as a 'treasure' in high-temperature colored glaze, the Langhong glaze is an excellent ceramic decorative material, has good corrosion resistance, can resist the scouring of strong alkaline washing liquid, receives more and more attention of people in recent years, and is widely applied to the decoration of common daily-use porcelain, particularly personalized tableware and tea sets.
The langhong glaze is precious since ancient times, not only because of its color is gorgeous, but also because it only has slight deviation when firing, will cause smoking, the color development is inhomogeneous, mobility technical problem such as being not suitable, makes the ceramic article qualification rate reduce by a wide margin, so is about firing the langhong and has always had a proverb: "poor in quality, good for fever with red body. Lead, cadmium and other elements which are toxic to human bodies and the environment are generally introduced into the traditional Langhurt glaze, if the traditional Langhurt glaze is applied to tableware and tea sets, the migration quantity of lead and cadmium is easy to exceed the standard, the traditional Langhurt glaze does not meet the requirements of national standards, and the traditional Langhurt glaze can also affect the health of consumers.
At present, part of researchers in China adopt lead-free and cadmium-free raw material formulas to prepare the Langhong glaze, but most of the researchers are in the laboratory research stage, and the Langhong glaze is easy to generate various defects when being applied to batch production and has low yield, so that the Langhong glaze cannot be practically applied. Meanwhile, reports on the research on the migration amount of harmful elements in the Langhua red glaze ceramic product and factors capable of contacting with food are not found. Therefore, the research of the novel Langhong glaze ceramic which has the characteristics of mass production, high yield, no harm to human bodies and environment and contact with food is an urgent task and has important economic and social benefits.
Disclosure of Invention
The invention aims to overcome the problems of high firing difficulty, low yield, excessive migration of harmful elements possibly occurring in ceramic products and the like of the existing Langhuang red ceramic glaze, and provides the Langhuang red ceramic glaze which has pure color development, stable performance, safety and environmental protection and can be contacted with food and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
the invention provides a Langhong ceramic glaze capable of contacting with food, which consists of ground glaze and overglaze, and is characterized in that: the ground coat comprises the following raw materials in percentage by mass: 22-26% of quartz and kaolin5-8% of Chenwan glaze fruit, 32-35% of Chenwan glaze fruit, 6-8% of Sanbao ceramic stone powder, 6-8% of magnesite, 11-14% of gypsum rubrum, 1-2% of zinc oxide and 12-15% of titanium dioxide;
the overglaze comprises the following raw materials in percentage by mass: 12-15% of quartz and kaolin6-9% of Chenwan glaze fruit, 48-55% of Chenwan glaze fruit, 5-8% of Sanbao porcelain stone powder, 4-6% of burnt talcum, 12-15% of coral powder, 0.3-1% of copper oxide and 0.8-2.5% of cassiterite powder.
The preparation method of the Langhong ceramic glaze capable of contacting with food is characterized by comprising the following steps:
the method comprises the following steps: mixing the ground glaze raw material and the surface glaze raw material according to the respective raw material composition percentage, putting the mixture into a ball mill for wet ball milling and sieving to respectively obtain glaze slip of the ground glaze and the surface glaze;
step two: applying a ground coat of 0.5-1 mm on the ceramic green body by using a glaze spraying method, drying at the temperature of 100-120 ℃ for 2-4 hours, and applying a surface coat of 1.5-2.5 mm on the ground coat by using a glaze spraying method;
step three: drying the glazed ceramic glaze blank at the temperature of 100-120 ℃ for 4-6 hours;
step four: and firing the dried glaze blank to obtain the bright red ceramic glaze decoration product, wherein the maximum firing temperature is 1330-1350 ℃.
The parameters of wet ball milling of the ground glaze in the first step are as follows: the weight ratio of raw materials, water and balls is 1: 0.8-1: 1, ball-milling for 8-12 hours in a ball mill; the parameters of the wet ball milling of the overglaze are as follows: the weight ratio of raw materials, water and balls is 1: 1-1.2: 1, ball-milling for 8-10 hours in a ball mill.
In the first step, the ground glaze is sieved by a sieve of 100-200 meshes; and sieving the overglaze with a 200-300-mesh sieve.
The firing system in the fourth step is as follows:
firstly: putting the glazed dry ceramic glaze blank into a kiln, and heating to 940-1020 ℃ from room temperature for 6-8 hours in an oxidizing atmosphere;
then: converting the atmosphere in the kiln from an oxidizing atmosphere to a strong reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 4-8%, heating the flue gas to 1330-1350 ℃ for 4-5 hours, converting the flue gas to a weak reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 1-2%, and preserving the heat for 1-2 hours;
and finally: and naturally cooling to room temperature after annealing.
The performance parameters of the step Sizhonglang red ceramic glaze decorative product are as follows: gloss: not less than 85; acid resistance and alkali resistance: a level; adaptability of the microwave oven: passing; thermal shock resistance: the heat exchange is carried out once at 160 ℃ to 20 ℃ without damage; migration amount of harmful elements: lead =0 mg/L; cadmium =0 mg/L; chromium =0 mg/L; nickel =0 mg/L; antimony =0 mg/L; zinc =0 mg/L; arsenic =0 mg/L; cobalt =0 mg/L; barium =0 mg/L; tin =0 mg/L; chroma value: l: 53.65-85.51, a: 18.23-28.71, b: -3.22 to 5.68.
The second step is that the ceramic green body comprises the following minerals in percentage by mass: 30-40% of Keemun porcelain powder, 30-40% of Saibao porcelain stone powder and 20-40% of star kaolin.
The chemical composition of the Chen gulf glaze fruit comprises the following components: SiO 22 74.53%，Al2O3 15.29%，Fe2O3 1.37%，CaO 0.53%，MgO 0.22%，K2O 1.44%，Na2O5.85 percent and ignition loss is 0.77 percent.
The chemical composition of the sanbao galapectium china stone powder in the invention is as follows: SiO 22 73.70%，Al2O3 15.74%，Fe2O3 0.70%，CaO 0.72%，MgO 0.16%，K2O 4.13%，Na2O3.79%, reduced by 1.13%.
The chemical composition of the gypsum rubrum in the invention is as follows: SiO 22 0.25%，Al2O3 0.15%，Fe2O3 0.01%，CaO 55.45%，MgO 0.10%，K2O 0.02%，Na20.21 percent of O and 43.81 percent of ignition loss.
The coral powder of the invention comprises the following chemical components: SiO 22 0.88%，Al2O3 0.37%，Fe2O3 0.89%，CaO 50.38%，MgO 4.66%，K2O 0.98%，Na2O 1.66%，P2O5 0.33%，SO30.41% and reduced by weight 39.44%.
The invention has the following beneficial effects:
1. the Langhong ceramic glaze which consists of the ground glaze and the surface glaze and can be contacted with food selects elements which do not contain toxic elements to human bodies and environment from the formula design, adopts natural minerals and chemical raw materials which do not contain toxic elements to human bodies and environment, avoids the introduction of elements which are toxic to human bodies and environment from the source, avoids the harm to human bodies and environment in the preparation process, and simultaneously has zero migration amount of the harmful elements of the internationally concerned ceramic products;
2. the invention relates to a preparation method of a bright and clean Langhong glaze ceramic glaze, which is prepared by matching and processing two different glaze formulas of a ground glaze and a surface glaze and adding a firing system of heating in an oxidizing atmosphere, then carrying out strong reduction and then carrying out weak reduction. The ground coat has the function of ensuring that the whole glaze layer has better fluidity to generate the top of the snow and the lines without opening, but not too thick, otherwise, the glaze flow is serious. The overglaze has the functions of color development and sheet opening, the color development can have the layering sense only within the thickness range, the sheet opening is facilitated, and the effect cannot be achieved when the overglaze is too thin or too thick. The parameters of ball milling and sieving can ensure that the ground glaze and the overglaze respectively obtain the particle distribution and the specific surface area with proper sizes, and the initial melting temperature of the glaze is mainly influenced. In the strong reduction stage of the firing system, copper oxide is very easy to be reduced into bright red cuprous oxide, in the weak reduction stage, the bright red cuprous oxide is in a stable state under the condition of glaze firing, if the concentration of carbon monoxide in the reducing atmosphere is too low, excessive copper oxide is not reduced, the color is greenish, and if the concentration of carbon monoxide in the reducing atmosphere is too high, the cuprous oxide is reduced into zero-valent copper, and the color is blackish;
3. the calcium oxide is introduced into the gypsum rubrum, so that the base glaze can play a good fluxing role. The calcium oxide is produced in mountainous areas where Jingdezhen and Leping are located, the calcium oxide content is extremely high and reaches 55%, and the iron oxide content is the lowest of all calcium raw materials and is lower than 0.02%;
4. the coral powder introduced into the overglaze is leftover bits and pieces of precious raw materials growing in deep sea in the process of manufacturing bonsais or furnishing articles, can well promote the color development of red, and contains 50% of calcium oxide, more than 4.5% of magnesium oxide and less than 0.5% of sulfur.
Detailed Description
Example 1
A Langhong ceramic glaze capable of contacting with food is composed of ground glaze and overglaze, and is characterized in that: the ground coat comprises the following raw materials in percentage by mass: 23% of quartz, 6% of kaolin, 32% of Chenwan glaze fruit, 6% of sanbao ceramic stone powder, 7% of magnesite, 12% of gypsum rubrum, 1% of zinc oxide and 13% of titanium dioxide;
the overglaze comprises the following raw materials in percentage by mass: 14% of quartz, 8% of kaolin, 52% of aged bay glaze, 6% of sanbao ceramic stone powder, 5% of calcined talc, 13.2% of coral powder, 0.5% of copper oxide and 1.3% of cassiterite powder.
The preparation method of the Langhong ceramic glaze capable of contacting with food is characterized by comprising the following steps:
the method comprises the following steps: mixing the ground glaze raw material and the surface glaze raw material according to the respective raw material composition percentage, putting the mixture into a ball mill for wet ball milling and sieving to respectively obtain glaze slip of the ground glaze and the surface glaze;
step two: applying a ground coat of 0.8mm on the ceramic green body by using a glaze spraying method, drying at the temperature of 100 ℃ for 3 hours, and applying a cover glaze of 2mm on the ground coat by using a glaze spraying method;
step three: drying the glazed ceramic glaze blank at 100 ℃ for 4 hours;
step four: and firing the dried glaze blank to obtain the bright red ceramic glaze decorative product, wherein the maximum firing temperature is 1350 ℃.
The parameters of wet ball milling of the ground glaze in the first step are as follows: the weight ratio of raw materials, water and balls is 1: 0.9: 1, ball milling for 8 hours in a ball mill; the parameters of the wet ball milling of the overglaze are as follows: the weight ratio of raw materials, water and balls is 1: 1.1: 1, ball milling in a ball mill for 10 hours.
In the first step, the ground glaze is sieved by a 200-mesh sieve; the overglaze is sieved by a 300-mesh sieve.
The firing system in the fourth step is as follows:
firstly: putting the glazed dry ceramic glaze blank into a kiln, and heating to 960 ℃ from room temperature in an oxidizing atmosphere for 6 hours;
then: converting the kiln internal atmosphere from an oxidizing atmosphere to a strong reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 6 percent, heating the flue gas to 1350 ℃ after 5 hours, converting the flue gas to a weak reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 1.5 percent, and preserving the heat for 1 hour;
and finally: and naturally cooling to room temperature after annealing.
The second step is that the ceramic green body comprises the following minerals in percentage by mass: 30% of Keemun porcelain powder, 30% of sanbao porcelain stone powder and 40% of star kaolin.
The glaze of the Langhurt glaze ceramic fired in the fourth step is bright and clean, fine open sheets are arranged on the surface, a circle of snow is white and has a notch at the top, the color is bright red and bright from the bottom to the bottom, and the glaze is accompanied with longitudinal cow-hair-shaped lines, and the following indexes are achieved through detection:
gloss: 88.
acid and alkali resistance: and (4) A stage.
Adaptability of the microwave oven: and (4) passing.
Thermal shock resistance: the heat exchange at 160-20 deg.c is once without damage.
Fifthly, migration amount of harmful elements: lead =0 mg/L; cadmium =0 mg/L; chromium =0 mg/L; nickel =0 mg/L; antimony =0 mg/L; zinc =0 mg/L; arsenic =0 mg/L; cobalt =0 mg/L; barium =0 mg/L; tin =0 mg/L.
Chroma value: l: 70.87, a: 26.88, b: 2.12.
example 2
A Langhong ceramic glaze capable of contacting with food is composed of ground glaze and overglaze, and is characterized in that: the ground coat comprises the following raw materials in percentage by mass: 25% of quartz, 7% of kaolin, 33% of aged bay glaze, 5% of sanbao ceramic powder, 6% of magnesite, 11% of gypsum rubrum, 1% of zinc oxide and 12% of titanium dioxide;
the overglaze comprises the following raw materials in percentage by mass: 14% of quartz, 8% of kaolin, 52% of aged bay glaze, 6% of sanbao ceramic stone powder, 5% of calcined talc, 13.2% of coral powder, 0.5% of copper oxide and 1.3% of cassiterite powder.
The preparation method of the Langhong ceramic glaze capable of contacting with food is characterized by comprising the following steps:
the method comprises the following steps: mixing the ground glaze raw material and the surface glaze raw material according to the respective raw material composition percentage, putting the mixture into a ball mill for wet ball milling and sieving to respectively obtain glaze slip of the ground glaze and the surface glaze;
step two: applying a ground coat of 0.8mm on the ceramic green body by using a glaze spraying method, drying at the temperature of 100 ℃ for 3 hours, and applying a cover glaze of 2mm on the ground coat by using a glaze spraying method;
step three: drying the glazed ceramic glaze blank at 100 ℃ for 4 hours;
step four: and firing the dried glaze blank to obtain the bright red ceramic glaze decorative product, wherein the maximum firing temperature is 1350 ℃.
The parameters of wet ball milling of the ground glaze in the first step are as follows: the weight ratio of raw materials, water and balls is 1: 0.9: 1, ball milling for 8 hours in a ball mill; the parameters of the wet ball milling of the overglaze are as follows: the weight ratio of raw materials, water and balls is 1: 1.1: 1, ball milling in a ball mill for 10 hours.
In the first step, the ground glaze is sieved by a 200-mesh sieve; the overglaze is sieved by a 300-mesh sieve.
The firing system in the fourth step is as follows:
firstly: putting the glazed dry ceramic glaze blank into a kiln, and heating to 960 ℃ from room temperature in an oxidizing atmosphere for 6 hours;
then: converting the kiln internal atmosphere from an oxidizing atmosphere to a strong reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 6%, heating the flue gas to 1350 ℃ for 4 hours, converting the flue gas to a weak reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 2%, and preserving the heat for 1 hour;
and finally: and naturally cooling to room temperature after annealing.
The second step is that the ceramic green body comprises the following minerals in percentage by mass: keemun porcelain powder 35%, Saibao porcelain powder 35%, and star kaolin 30%.
The glaze of the Langhurt glaze ceramic fired in the fourth step is bright and clean, fine open sheets are arranged on the surface, a circle of snow is white and has a notch at the top, the color is bright red and bright from the bottom to the bottom, and the glaze is accompanied with longitudinal cow-hair-shaped lines, and the following indexes are achieved through detection:
gloss: 87.
acid and alkali resistance: and (4) A stage.
Adaptability of the microwave oven: and (4) passing.
Thermal shock resistance: the heat exchange at 160-20 deg.c is once without damage.
Fifthly, migration amount of harmful elements: lead =0 mg/L; cadmium =0 mg/L; chromium =0 mg/L; nickel =0 mg/L; antimony =0 mg/L; zinc =0 mg/L; arsenic =0 mg/L; cobalt =0 mg/L; barium =0 mg/L; tin =0 mg/L.
Chroma value: l: 80.51, a: 25.63, b: -3.22.
Example 3
A Langhong ceramic glaze capable of contacting with food is composed of ground glaze and overglaze, and is characterized in that: the ground coat comprises the following raw materials in percentage by mass: 22% of quartz, 5% of kaolin, 35% of Chenwan glaze fruit, 6% of Sanbao ceramic stone powder, 6% of magnesite, 12% of gypsum rubrum, 2% of zinc oxide and 12% of titanium dioxide;
the overglaze comprises the following raw materials in percentage by mass: 12% of quartz, 6% of kaolin, 55% of Chenwan glaze fruit, 7% of Sanbao porcelain stone powder, 5% of calcined talc, 13.6% of coral powder, 0.3% of copper oxide and 1.1% of cassiterite powder.
The preparation method of the Langhong ceramic glaze capable of contacting with food is characterized by comprising the following steps:
the method comprises the following steps: mixing the ground glaze raw material and the surface glaze raw material according to the respective raw material composition percentage, putting the mixture into a ball mill for wet ball milling and sieving to respectively obtain glaze slip of the ground glaze and the surface glaze;
step two: applying 1mm of ground coat on the ceramic green body by a glaze spraying method, drying at 120 ℃ for 4 hours, and applying 2.5mm of overglaze on the ground coat by a glaze spraying method;
step three: drying the glazed ceramic glaze blank at 120 ℃ for 6 hours;
step four: and firing the dried glaze blank to obtain the bright red ceramic glaze decorative product, wherein the maximum firing temperature is 1330 ℃.
The parameters of wet ball milling of the ground glaze in the first step are as follows: the weight ratio of raw materials, water and balls is 1: 0.9: 1, ball milling for 10 hours in a ball mill; the parameters of the wet ball milling of the overglaze are as follows: the weight ratio of raw materials, water and balls is 1: 1.1: 1, ball milling in a ball mill for 10 hours.
In the first step, the ground glaze is sieved by a 100-mesh sieve; the overglaze is sieved by a 200-mesh sieve.
The firing system in the fourth step is as follows:
firstly: putting the glazed dry ceramic glaze blank into a kiln, and heating the ceramic glaze blank to 1020 ℃ from room temperature in an oxidizing atmosphere for 6 hours;
then: converting the kiln internal atmosphere from an oxidizing atmosphere to a strong reducing atmosphere to enable the concentration of carbon monoxide in the flue gas to be 8%, heating the flue gas to 1330 ℃ for 4 hours, converting the flue gas to a weak reducing atmosphere to enable the concentration of carbon monoxide in the flue gas to be 1%, and preserving heat for 1 hour;
and finally: and naturally cooling to room temperature after annealing.
The second step is that the ceramic green body comprises the following minerals in percentage by mass: 40% of Keemun porcelain stone powder, 40% of sanbao porcelain stone powder and 20% of star kaolin.
The glaze of the Langhurt glaze ceramic fired in the fourth step is bright and clean, fine open sheets are arranged on the surface, a circle of snow is white and has a notch at the top, the color is bright red and bright from the bottom to the bottom, and the glaze is accompanied with longitudinal cow-hair-shaped lines, and the following indexes are achieved through detection:
gloss: 86.
acid and alkali resistance: and (4) A stage.
Adaptability of the microwave oven: and (4) passing.
Thermal shock resistance: the heat exchange at 160-20 deg.c is once without damage.
Fifthly, migration amount of harmful elements: lead =0 mg/L; cadmium =0 mg/L; chromium =0 mg/L; nickel =0 mg/L; antimony =0 mg/L; zinc =0 mg/L; arsenic =0 mg/L; cobalt =0 mg/L; barium =0 mg/L; tin =0 mg/L.
Chroma value: l: 53.65, a: 18.23, b: 5.68.
example 4
A Langhong ceramic glaze capable of contacting with food is composed of ground glaze and overglaze, and is characterized in that: the ground coat comprises the following raw materials in percentage by mass: 26% of quartz, 5% of kaolin, 32% of Chenwan glaze fruit, 6% of sanbao ceramic stone powder, 6% of magnesite, 11% of gypsum rubrum, 1% of zinc oxide and 13% of titanium dioxide;
the overglaze comprises the following raw materials in percentage by mass: 15% of quartz, 9% of kaolin, 48% of Chenwan glaze, 6% of sanbao ceramic stone powder, 4% of calcined talc, 14.5% of coral powder, 1% of copper oxide and 2.5% of cassiterite powder.
The preparation method of the Langhong ceramic glaze capable of contacting with food is characterized by comprising the following steps:
the method comprises the following steps: mixing the ground glaze raw material and the surface glaze raw material according to the respective raw material composition percentage, putting the mixture into a ball mill for wet ball milling and sieving to respectively obtain glaze slip of the ground glaze and the surface glaze;
step two: applying a ground coat of 0.5mm on the ceramic green body by using a glaze spraying method, drying at the temperature of 100 ℃ for 2 hours, and applying a surface glaze of 1.5mm on the ground coat by using a glaze spraying method;
step three: drying the glazed ceramic glaze blank at 100 ℃ for 4 hours;
step four: and firing the dried glaze blank to obtain the bright red ceramic glaze decorative product, wherein the maximum firing temperature is 1340 ℃.
The parameters of wet ball milling of the ground glaze in the first step are as follows: the weight ratio of raw materials, water and balls is 1: 0.9: 1, ball milling for 8 hours in a ball mill; the parameters of the wet ball milling of the overglaze are as follows: the weight ratio of raw materials, water and balls is 1: 1.1: 1, ball milling in a ball mill for 10 hours.
In the first step, the ground glaze is sieved by a 200-mesh sieve; the overglaze is sieved by a 300-mesh sieve.
The firing system in the fourth step is as follows:
firstly: putting the glazed dry ceramic glaze blank into a kiln, and heating to 980 ℃ from room temperature in an oxidizing atmosphere for 6 hours;
then: the method comprises the following steps of (1) converting the internal atmosphere of the kiln from an oxidizing atmosphere to a strong reducing atmosphere to enable the concentration of carbon monoxide in flue gas to be 4%, heating the temperature to 1340 ℃ for 5 hours, then converting the internal atmosphere of the kiln to a weak reducing atmosphere to enable the concentration of carbon monoxide in the flue gas to be 2%, and keeping the temperature for 2 hours;
and finally: and naturally cooling to room temperature after annealing.
The ceramic green body in the second step comprises the following raw materials in percentage by mass: keemun porcelain powder 35%, Saibao porcelain powder 35%, and star kaolin 30%.
The glaze of the Langhurt glaze ceramic fired in the fourth step is bright and clean, fine open sheets are arranged on the surface, a circle of snow is white and has a notch at the top, the color is bright red and bright from the bottom to the bottom, and the glaze is accompanied with longitudinal cow-hair-shaped lines, and the following indexes are achieved through detection:
gloss: 87.
acid and alkali resistance: and (4) A stage.
Adaptability of the microwave oven: and (4) passing.
Thermal shock resistance: the heat exchange at 160-20 deg.c is once without damage.
Fifthly, migration amount of harmful elements: lead =0 mg/L; cadmium =0 mg/L; chromium =0 mg/L; nickel =0 mg/L; antimony =0 mg/L; zinc =0 mg/L; arsenic =0 mg/L; cobalt =0 mg/L; barium =0 mg/L; tin =0 mg/L.
Chroma value: l: 69.66, a: 28.71, b: 2.68.
Claims (5)
1. a Langhong ceramic glaze capable of contacting with food is composed of ground glaze and overglaze, and is characterized in that: the ground coat comprises the following raw materials in percentage by mass: 22-26% of quartz, 5-8% of kaolin, 32-35% of Chenwan glaze, 6-8% of sanbao ceramic stone powder, 6-8% of magnesite, 11-14% of gypsum rubrum, 1-2% of zinc oxide and 12-15% of titanium dioxide;
the overglaze comprises the following raw materials in percentage by mass: 12-15% of quartz, 6-9% of kaolin, 48-55% of Chenwan glaze, 5-8% of sanbao ceramic stone powder, 4-6% of burnt talc, 12-15% of coral powder, 0.3-1% of copper oxide and 0.8-2.5% of cassiterite powder;
the preparation method of the Langhong ceramic glaze capable of being in contact with food comprises the following steps:
the method comprises the following steps: mixing the ground glaze raw material and the surface glaze raw material according to the respective raw material composition percentage, putting the mixture into a ball mill for wet ball milling and sieving to respectively obtain glaze slip of the ground glaze and the surface glaze;
step two: applying a ground coat of 0.5-1 mm on the ceramic green body by using a glaze spraying method, drying at the temperature of 100-120 ℃ for 2-4 hours, and applying a surface coat of 1.5-2.5 mm on the ground coat by using a glaze spraying method;
step three: drying the glazed ceramic glaze blank at the temperature of 100-120 ℃ for 4-6 hours;
step four: firing the dried glaze blank to obtain a bright red ceramic glaze decoration product, wherein the maximum firing temperature is 1330-1350 ℃;
the chemical composition of the Chenwan glaze fruit is as follows: SiO 22 74.53％，Al2O3 15.29％，Fe2O3 1.37％，CaO 0.53％，MgO 0.22％，K2O 1.44％，Na2O5.85 percent and ignition loss is 0.77 percent;
the chemical composition of the sanbao galaxy china stone powder is as follows: SiO 22 73.70％，Al2O3 15.74％，Fe2O3 0.70％，CaO 0.72％，MgO 0.16％，K2O 4.13％，Na2O3.79%, reduced by 1.13%;
the chemical composition of the gypsum rubrum is as follows: SiO 22 0.25％，Al2O3 0.15％，Fe2O3 0.01％，CaO 55.45％，MgO 0.10％，K2O 0.02％，Na20.21% of O and 43.81% of ignition;
the chemical composition of the coral powder is：SiO2 0.88％，Al2O3 0.37％，Fe2O3 0.89％，CaO 50.38％，MgO 4.66％，K2O 0.98％，Na2O 1.66％，P2O5 0.33％，SO30.41% and reduced by weight 39.44%.
2. The langhong ceramic glaze according to claim 1, characterized in that: the parameters of wet ball milling of the ground glaze in the first step are as follows: the weight ratio of raw materials, water and balls is 1: 0.8-1: 1, ball-milling for 8-12 hours in a ball mill; the parameters of the wet ball milling of the overglaze are as follows: the weight ratio of raw materials, water and balls is 1: 1-1.2: 1, ball-milling for 8-10 hours in a ball mill.
3. The langhong ceramic glaze according to claim 1, characterized in that: in the first step, the ground glaze is sieved by a sieve of 100-200 meshes; and sieving the overglaze with a 200-300-mesh sieve.
4. The langhong ceramic glaze according to claim 1, characterized in that: the firing system in the fourth step is as follows:
firstly: putting the glazed dry ceramic glaze blank into a kiln, and heating to 940-1020 ℃ from room temperature for 6-8 hours in an oxidizing atmosphere;
then: converting the atmosphere in the kiln from an oxidizing atmosphere to a strong reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 4-8%, heating the flue gas to 1330-1350 ℃ for 4-5 hours, converting the flue gas to a weak reducing atmosphere to ensure that the concentration of carbon monoxide in the flue gas is 1-2%, and preserving the heat for 1-2 hours;
and finally: and naturally cooling to room temperature after annealing.
5. The langhong ceramic glaze according to claim 1, characterized in that: the performance parameters of the step Sizhonglang red ceramic glaze decorative product are as follows: gloss: not less than 85; acid resistance and alkali resistance: a level; adaptability of the microwave oven: passing; thermal shock resistance: the heat exchange is carried out once at 160 ℃ to 20 ℃ without damage; migration amount of harmful elements: lead is 0 mg/L; cadmium is 0 mg/L; chromium is 0 mg/L; nickel is 0 mg/L; antimony is 0 mg/L; 0mg/L of zinc; arsenic is 0 mg/L; cobalt is 0 mg/L; barium is 0 mg/L; tin is 0 mg/L; chroma value: l: 53.65-85.51, a: 18.23-28.71, b: -3.22 to 5.68.
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