Lithium-free and glaze-free high-temperature-resistant sand pot and preparation method thereof

Abstract

The present application relates to the field of sand pot preparation, and particularly relates to a lithium-free and glaze-free high-temperature-resistant sand pot and a preparation method thereof; the sand pot comprises the following raw materials in parts by weight: Qinggu 15-25 parts, Huanggu 30-45 parts, Kuotu 10-25 parts, Alum stone 10-20 parts, Feldspar 10-15 parts, and White clay 5-10 parts; the sand pot does not contain lithium (lithium spar) and is not glazed inside and outside, so that the cost is greatly reduced. In the formula, Kuotu (magnesium oxide) is added, which has a good thermal stability effect; therefore, Pingding local white clay is added in the formula, which plays a role in reducing the water absorption rate, and the water absorption rate reaches 3.67-3.8. The raw materials are all from the local area and do not have any chemical components, so that the original taste of food materials cannot be changed, so that the taste and nutrition of soup materials can be maintained. Moreover, the sand pot has good heat preservation performance, so that the cooking quality of dishes can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sand pot preparation, in particular to a lithium-free and glaze-free high-temperature-resistant sand pot and a preparation method thereof. BACKGROUND

[0002] The sand pot has a firing history of more than 2000 years. The sand pot originated in the Qin Dynasty, flourished in the Tang and Song Dynasties, and became the main product of local handicraft technology and commercial trade in the Tang Dynasty. The sand pot of the Ming Dynasty was comparable to the products of Yixing, Jiangsu, Dehua, Fujian, and Shiwang, Guangdong. In the Qing Dynasty, it was famous together with Yixing purple sand pottery and Guangdong sand pot, and was known as "the three best" in history, with a long history and unique cultural heritage. According to the Records of Pingding County, the Pingding sand goods were famous far and wide. Its unique cultural charm, such as "not changing color when cooking rice, changing taste when stewing meat, and not changing nature when decocting medicine", cannot be replaced by other materials. Its unique function is recognized by generations, and it carries the Pingding culture and the Chinese civilization. After more than 2000 years of change and development, it has become a well-known traditional characteristic product in Shanxi and even in the whole country, and is an important part of Chinese sand pottery culture. The Pingding sand pot firing process was listed in the intangible cultural heritage of Shanxi in 2009, and the Pingding sand pot making technique was listed in the national intangible cultural heritage in 2014.

[0003] Pingding is mainly mountainous and hilly. The western part is a sand shale mountainous area, and the eastern and central parts are a basin covered with loess and sand shale hilly areas. According to the data, shale is a kind of sedimentary rock with complex composition, but it has thin page or thin sheet joint, which is mainly formed by clay deposition under pressure and temperature, mixed with quartz, feldspar debris and other chemical substances. The clay mixed in the shale is a plastic mineral material containing kaolin, hydrous kaolin and very small (<2µ;m) silicate. In addition to aluminum, it also contains chemical elements such as magnesium, iron, sodium, potassium and calcium. This material, commonly known as "crucible" by the people, is pure in color, low in dyeing quality, soft and plastic, which is an excellent material for firing sand pots. Qingguo is such a raw material.

[0004] Nowadays, a large amount of lithium spar is added to the popular lithium porcelain sand pot. In order to improve the performance of sand pot in resisting rapid cooling and heating, lithium spar is also added to the existing traditional sand pot. In recent years, the price of lithium spar has risen from more than 7000 yuan / ton to more than 40000 yuan / ton, so the cost is high. In the market, as a daily necessity, if the price rises, consumers will be difficult to bear. Based on such a severe situation, only new ways can be found to innovate in formula and process. SUMMARY

[0005] The present application overcomes the deficiencies of the prior art, and provides a lithium-free and glaze-free high-temperature-resistant sand pot, which is developed without adding lithium spodumene, and still does not affect the performance of the sand pot.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

[0007] A lithium-free and glaze-free high-temperature-resistant sand pot, comprising the following raw materials in parts by weight: Qinggu 15-25 parts, Huanggu 30-45 parts, bitter earth 10-25 parts, alum stone 10-20 parts, feldspar 10-15 parts, and white clay 5-10 parts.

[0008] The chemical composition analysis table of the sand pot is as follows:

[0009] SiO2 Al2O3 Fe2O3 CaO K2O MgO 40-48％ 22-32％ 1-2％ 1.5-2.5％ 1-1.5％ 0.01-0.03％

[0010] The present application also provides a preparation method of the above-mentioned lithium-free and glaze-free high-temperature-resistant sand pot, comprising the following steps:

[0011] Step one, processing of raw materials: according to the proportion in the formula, the fine powder content reaches 60-75%, the particle fineness is controlled between 160-180 meshes, and the particle content is controlled between 30-38%. The particle fineness is controlled between 20-24 meshes. The various raw materials are uniformly stirred in the mixer. Then water is added for stirring, and the mud is stacked for not less than 3-5 days after being formed;

[0012] Step two, after the stacking, the mud is processed by a mud processing machine, and the mud is processed under the condition that the vacuum degree is not less than 0.09 Mpa, the water content is adjusted to 21-24%, and the finished mud is processed;

[0013] Step three, molding, a larger molding machine TC600 slide plate special-shaped molding machine is used to make various shapes of sand pots, and the water content of the blank body is controlled to be less than 2%;

[0014] Step four, kiln firing, using one-time oxidation flame firing.

[0015] Further, the stacking conditions in step two are light-proof, wind-proof, the temperature is controlled at 25+2℃, and the humidity is controlled at 30+2℃.

[0016] Further, the firing system in step four is room temperature-300℃, 4 hours; 300℃-950℃, 4 hours; 950℃-1050℃, 1 hour; 1050℃-1240℃, 1.5 hours; 1240℃, 1.5 hours; 1240℃-1 cooling, 4 hours.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The sand pot of the present application does not contain lithium (spodumene) and is not glazed on the inside and outside, so that the cost is greatly reduced. In the formula, magnesia (magnesium oxide) is added, which has a very good thermal stability effect. In order to improve the performance of resisting sudden cooling and heating, the raw material particles are relatively large (20-24 mesh), so that the formula is added with Pingding local white clay, which plays a role in reducing the water absorption rate, and the water absorption rate reaches 3.67-3.8. The raw materials are all from the local area and do not contain any chemical components, so that the original taste of the food materials cannot be changed, so that the taste and nutrition of the soup can be maintained. The characteristics of the clay make it possible to uniformly disperse heat, so that the food materials are evenly heated, the taste of the food materials is increased, and good heat preservation performance is achieved, so that the cooking quality of the dishes is ensured. Since the raw materials are all from nature and do not contain any chemical components, the medicine pot can be made of the medicine pot, which has the advantage of "medicine pot not changing". DETAILED DESCRIPTION

[0019] The present application will be further described below in combination with specific examples.

[0020] Example 1

[0021] A lithium-free and glaze-free high-temperature-resistant sand pot, comprising the following raw materials in parts by weight: Qinggu 15 parts, Huanggu 45 parts, magnesia 10 parts, alunite 20 parts, feldspar 10 parts, and white clay 10 parts.

[0022] A preparation method of a lithium-free and glaze-free high-temperature-resistant sand pot, comprising the following steps:

[0023] Step one, processing of raw materials: according to the proportion in the formula, the fine powder content reaches 60-75%, the particle size is controlled between 160-180 mesh, and the particle content is controlled between 30-38%. The particle size is controlled between 20-24 mesh. The various raw materials are pre-mixed in a mixer. Then water is added for stirring, and the mud is stacked for not less than 3-5 days after being formed into mud; the stacking conditions are light and wind, and the temperature is controlled at about 25+2℃. The humidity is controlled at about 30+2℃, which is beneficial to the aging of the mud in such an environment.

[0024] Step two, after the mud is stacked, the mud is processed by a mud processing machine under the condition that the vacuum degree is not less than 0.09mpa, the water content is adjusted to 21-24%, and the finished mud is processed; according to the needs of the product, the thickness of the mud strip is determined to facilitate production.

[0025] Step three, molding, using a larger molding machine TC600 slide plate special-shaped molding machine to make various shapes of sand pots, and the water content of the blank body is controlled to be less than 2% before entering the kiln for firing.

[0026] Step four, kiln firing, using disposable oxidation flame firing, its firing system as follows:

[0027] Temperature Time Function Kiln temperature - 300°C 4 hours Excluding moisture 300℃—950℃ 4 hours Oxidative decomposition stage 950℃—1050℃ 1 hour Strong oxidative decomposition stage 1050℃—1240℃ 1.5 hours Oxidative atmosphere formation of new crystals 1240℃ 1.5 hours Oxidation holding 1240°C - cooling 4 hours Liquid phase cooling solidification

[0028] Firing uses microcomputer numerical control, automatic temperature adjustment, according to the specific process requirements of the application, the exhaust, combustion-supporting, quenching, preheating, cooling and other processes and coal gas supply, with the independently developed numerical control software, all process technical parameters are input into the numerical control cabinet and computer, and the display screen is synchronously displayed, such as temperature change, pressure change, semi-finished product in and out of the kiln, product quantity, and automatic alarm for fan overload, gas pressure overrun, temperature overrun, combustion-supporting pressure overrun. Thus, the original old process relies on manual experience to adjust the furnace temperature and pressure, which becomes a numerical control software system with regularity, data and quantitative requirements. The traditional original method of relying on experience to observe the degree of fire is changed. Such accurate temperature control plays a good guarantee role for product quality and yield.

[0029] Example 2

[0030] A lithium-free and glaze-free high-temperature-resistant sand pot comprises the following raw materials in parts by weight: green crucible 25 parts, yellow crucible 30 parts, bauxite 25 parts, alunite 10 parts, feldspar 15 parts, and white clay 5 parts.

[0031] A preparation method of a lithium-free and glaze-free high-temperature-resistant sand pot comprises the following steps:

[0032] Step one, processing of raw materials: according to the proportions in the formula, the fine powder content reaches 60-75%, the particle size is controlled between 160-180 meshes, and the particle content is controlled between 30-38%. The particle size is controlled between 20-24 meshes. The various raw materials are uniformly stirred in the mixer. Then, water is added for stirring, and the mud is stacked for not less than 3-5 days after being formed; the stacking conditions are light-proof, wind-proof, and the temperature is controlled at about 25+2℃. The humidity is controlled at about 30+2℃, which is beneficial to the aging of the mud in such an environment.

[0033] Step two, after the mud is stacked, the mud is refined by a mud refining machine under the condition that the vacuum degree is not less than 0.09mpa, the water content is adjusted to 21-24%, and the finished mud is refined; according to the needs of the product, the thickness of the mud strip is determined to facilitate production.

[0034] Step three, molding, using a larger molding machine TC600 slide plate special-shaped molding machine to make various shaped sand pots, and the water content of the blank body is controlled to be less than 2% before entering the kiln for firing.

[0035] Step four, kiln firing, using disposable oxidation flame firing, its firing system same as example 1.

[0036] Example 3

[0037] A lithium-free and glaze-free high-temperature-resistant sand pot comprises the following raw materials in parts by weight: Qinggu 20 parts, Huanggu 40 parts, Bitter earth 20 parts, Alum stone 15 parts, Feldspar 12 parts, and White clay 8 parts.

[0038] A preparation method of a lithium-free and glaze-free high-temperature-resistant sand pot comprises the following steps:

[0039] Step one, processing of raw materials: according to the proportion in the formula, the fine powder content reaches 60-75%, the particle fineness is controlled between 160-180 meshes, and the particle content is controlled between 30-38%. The particle fineness is controlled between 20-24 meshes. The various raw materials are uniformly stirred in the mixer. Then, water is added for stirring, and the mud is stacked for not less than 3-5 days after being formed; the stacking conditions are light-proof, wind-proof, and the temperature is controlled at about 25+2℃. The humidity is controlled at about 30+2℃, which is beneficial to the aging of the mud in such an environment.

[0040] Step two, after the mud is stacked, the mud is processed by a mud processing machine under the condition that the vacuum degree is not less than 0.09mpa, the moisture content is adjusted to 21-24%, and the finished mud is processed; according to the needs of the product, the thickness of the mud strip is determined to facilitate production.

[0041] Step three, molding, a larger molding machine TC600 slide plate special-shaped molding machine is used to make various sand pots, and the moisture content of the blank body is controlled to be less than 2% so that it can be put into the kiln for firing.

[0042] Step four, kiln firing, one-time oxidation flame firing is adopted, and the firing system is the same as that of Example 1.

[0043] The performance test of the sand pot products prepared in Examples 1-3 is as follows:

[0044] (1) The water permeability of the sand pot product is tested to be 3.67%, which is not more than the basic requirement of about 4% of the sand pot.

[0045] (2) The refractoriness of the sand pot product during dry burning: when the dry burning temperature is 300℃, the product has no damage after quenching test. The product has no damage after quenching test at 400℃.

[0046] (3) The above two test results prove that the product is qualified in terms of thermal stability.

Claims

1. A high temperature resistant sand pot without lithium and glaze, characterized in that, The raw materials include the following components: Qinggu 15-25 parts, Huanggu 30-45 parts, Buxi 10-25 parts, Alunite 10-20 parts, Feldspar 10-15 parts, and White clay 5-10 parts.

2. The preparation method of the lithium-free and glaze-free high-temperature-resistant sand pot according to claim 1, characterized in that, The method comprises the following steps: Step one, processing of raw materials: according to the proportion in the formula, the fine powder content reaches 60-75%, the particle fineness is controlled between 160-180 meshes, the particle content is controlled between 30-38%, the particle fineness is controlled between 20-24 meshes, the various raw materials are uniformly stirred in a mixer, then water is added for stirring, the mud is stacked for not less than 3-5 days; Step two, after the mud is stacked, the mud is processed by a mud processing machine, the vacuum degree is not less than 0.09mpa, the water content is adjusted to 21-24% for processing of the finished mud; Step three, molding, a molding machine TC600 slide plate special-shaped molding machine is adopted to make various sand pots, and the water content of the blank is controlled to be less than 2%; Step four, kiln firing, one-time oxidation flame firing is adopted.