A purple sand sintered body for tea soup flavoring and a preparation method and application thereof

Abstract

The application provides a purple sand sintered body for tea soup flavoring and a preparation method and application thereof. The purple sand sintered body for tea soup flavoring is prepared by mixing and sintering Zhaozhuang red mud purple sand mud material and Ben Mountain mud purple sand mud material in a mass ratio of (95-70):(5-30). The Fe2O3 content in the Zhaozhuang red mud purple sand mud material is not less than 8.5 wt.% and the MgO content is not less than 1.0 wt.%, and the trace element Mn content in the Ben Mountain mud purple sand mud material is not less than 40 mg / kg. The purple sand sintered body does not need to add other preparations, and is mixed with Zhaozhuang red mud purple sand mud material rich in iron and magnesium and Ben Mountain mud purple sand mud material rich in manganese, an iron-based multi-element catalytic system is constructed by limiting the mass ratio of the two, and a pore is generated by limiting the sintering process, a confined space is created, the synergistic effect of the multi-element metal catalyst is enhanced, and the generation efficiency of tea soup flavoring substances can be significantly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of purple clay materials, and particularly relates to a purple clay sintered body for enhancing the aroma of tea, and a preparation method and application thereof. Background Art

[0002] With the prosperity of the social economy and the improvement of people's quality of life, consumers are increasingly pursuing healthy and natural drinking experiences. Zisha tea vessels are favored for their natural, breathable, and aesthetic qualities. In tea culture, in particular, they are believed to improve the taste and aroma of tea. However, there is a lack of systematic research on the interaction between purple clay materials and tea flavor compounds. In particular, in the modern and diverse tea brewing process, how to better utilize the purple clay material to enhance tea flavor remains understudied.

[0003] For example, patent document CN201210009248 discloses a negative ion health-promoting purple clay teapot. The process involves mixing coral fossils, tourmaline, opal, serpentine, medical stone, strange ice stone, hokutolite, yiwang stone, shells, aluminum oxide, zirconium oxide, and zirconium phosphate. The mixture is then ground evenly and used as a negative ion additive with the purple clay. The finished product is then fired. During tea brewing, the finished teapot releases negative ions, improving the flavor and making the tea soup sweeter.

[0004] Disadvantages of this method: It incorporates many non-purple clay minerals in addition to purple clay. Furthermore, while the method mentions that purple clay vessels can enhance the "sweetness of tea," it does not specifically identify which flavor substances or chemical components are enhanced or improved. The flavor of tea is influenced by numerous factors, including volatile compounds, sugars, amino acids, and phenolic compounds within the tea. This prior art also fails to clearly describe the interaction mechanism between purple clay vessels and these components, merely mentioning the "sweetness of tea" in general terms, lacking scientific evidence or detailed analysis of flavor substances.

[0005] For example, patent document CN201410338012 discloses a blue-gray purple clay and its firing method. The process involves mixing and pulverizing purple clay, sesame clay, and azurite clay. The clay is then kneaded, aged, and refined to create purple clay vessels, which are then fired to produce the finished product. The innovation lies in the artificial blending of the clays, without the addition of any artificial pigments, to create a purple clay material that matches the color and texture of blue-gray clay from the Ming and Qing dynasties. This method also enhances the flavor and sweetness of tea.

[0006] Disadvantages of this method: It primarily reflects the color change of the purple clay tea, but does not delve into how to specifically enhance the flavor of the tea. It only generally mentions "sweet tea" without specifying which key flavor components are enhanced or improved.

[0007] Therefore, it is necessary to develop a purple clay sintered body for enhancing the flavor of tea soup, so as to effectively improve the flavor experience of tea soup and meet the market demand for healthy beverage containers. Summary of the Invention

[0008] The purpose of the present invention is to overcome the defects of the prior art and provide a purple clay sintered body with enhanced tea flavor substances, a preparation method and application thereof.

[0009] The present invention provides the following technical solutions:

[0010] The present invention provides a method for preparing a purple clay sintered body for enhancing the aroma of tea soup, comprising the following steps:

[0011] S1. Grind and sieve Zhaozhuang Zhuni purple clay and Benshan Duanni purple clay separately, wherein the Fe2O3 content of the Zhaozhuang Zhuni purple clay is not less than 8.5wt.% and the MgO content is not less than 1.0wt.%, and the trace element Mn content of the Benshan Duanni purple clay is not less than 40mg / kg;

[0012] S2, uniformly mixing the Zhaozhuang Zhuni purple clay material and the Benshan Duanni purple clay material obtained in step S1 according to a proportion to obtain a binary purple clay mixed material, wherein the mass ratio of the Zhaozhuang Zhuni purple clay material to the Benshan Duanni purple clay material is (5-30):(95-70);

[0013] S3, adding pure water to the binary purple sand mixed clay obtained in step S2, and performing vacuum kneading to obtain clay blocks;

[0014] S4, pressing the clay block obtained in step S3 into a green body, and then bisque firing the green body to obtain the purple clay sintered body.

[0015] Furthermore, in step S1, a Raymond mill is used for crushing and screening, wherein the Zhaozhuang Zhuni purple clay material is sieved to 100 mesh, and the Benshan Duanni purple clay material is sieved to 200 mesh.

[0016] Furthermore, in step S2: the Zhaozhuang Zhuni purple clay material and the Benshan Duanni purple clay material are stirred and mixed for 30 minutes and then ball-milled; the ball-milling speed is 500 rpm, the ball-milling time is 2 hours, the grinding medium of the ball mill is 5mm zirconia balls, and the sieve mesh number is 400 mesh.

[0017] Further, in step S3: in step S3: pure water accounting for 30 wt.% of the total weight of the binary purple clay mixed mud is added to the binary purple clay mixed mud material, and a mechanical vacuum mud kneading machine is used to knead the mud to obtain mud blocks, and the obtained mud blocks are aged for a aging time of more than 1 month.

[0018] Furthermore, in step S4: the bisque firing of the green body is specifically as follows: heating from room temperature to 300°C at a heating rate of 3°C / min; then heating from 300°C to 800°C at a heating rate of 5°C / min, and staying at 800°C for 30 minutes; finally heating from 800°C to 1000-1300°C at a heating rate of 4°C / min, and staying for 8 hours; and cooling in the furnace to obtain the purple clay sintered body for enhancing the aroma of tea.

[0019] The present invention also provides a tea soup aroma-enhancing purple clay sintered body produced by the preparation method.

[0020] The invention also provides application of the tea soup aroma-enhancing purple clay sintered body in brewing tea beverages.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention combines iron- and magnesium-rich Zhaozhuang Zhuni purple clay with manganese-rich Benshan Duanni purple clay, defining a specific mass ratio to create an iron-based multi-metal catalyst system. Furthermore, through a controlled sintering process, pores are generated, creating a confined space and enhancing the synergistic effect of the multi-metal catalysts, significantly improving the production of flavor compounds in tea.

[0023] The purple clay sintered body in the present invention has an effect on the flavor substances of tea, mainly because iron ions act as catalysts, which can promote the oxidation reaction of polyphenols in tea. Specifically, the divalent iron ions in the sintered body can react with polyphenols to form iron-polyphenol complexes, which in turn oxidize the polyphenols to generate quinone compounds. These quinone compounds can be further oxidized to form aldehyde aroma substances, or react with amino acids, proteins, etc., ultimately changing the flavor of the tea soup. At high temperatures, magnesium has a certain reducing effect and can promote the reaction of iron and manganese at lower temperatures. Low-valent manganese accelerates the oxidation of divalent iron in saturated air and accelerates the production of quinone compounds. At the same time, the control of the sintering temperature can cause the purple clay sintered body to produce pores, and iron, manganese and magnesium are enriched in the pores, enhancing the catalytic effect through the confinement effect, thereby achieving the enhancement effect of the binary purple clay material on the flavor substances of tea. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the SEM image of the sintered body prepared in Example 1;

[0025] Figure 2 for Figure 1 EDS spectrum of the middle spot1 area;

[0026] Figure 3 for Figure 1 EDS spectrum of the middle spot2 area;

[0027] Figure 4This is an SEM image of the sintered body prepared in Example 4;

[0028] Figure 5 for Figure 4 EDS spectrum of the middle spot1 area;

[0029] Figure 6 for Figure 4 EDS spectrum of the middle spot2 area;

[0030] Figure 7 This is an SEM image of the sintered body prepared in Example 5;

[0031] Figure 8 for Figure 7 EDS spectrum of the middle spot1 area;

[0032] Figure 9 for Figure 7 EDS spectrum of the middle spo2 region;

[0033] Figure 10 The radar charts of flavor substances dissolved in tea soup in different containers, including white porcelain cups and sintered cups of Examples 1-5 of the present invention, were measured by gas chromatography-mass spectrometry (GC-MS). DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] The steps for preparing the purple sand sintered material for enhancing the aroma of tea are as follows:

[0037] S1. Select Zhaozhuang Zhuni purple clay and Benshan Duanni purple clay as the basic materials for preparing purple clay sintered bodies, wherein the Fe2O3 content of the Zhaozhuang Zhuni purple clay is not less than 8.5wt.% and the MgO content is not less than 1.0wt.%, and the trace element Mn content of the Benshan Duanni purple clay is not less than 40 mg / kg; and the two clays are dried separately to ensure that the water content of the two clays is less than 10wt.%. Subsequently, the dried clays are crushed and sieved using a Raymond mill to further refine the particle size. Specifically, the Zhaozhuang Zhuni purple clay needs to be sieved to 100 mesh; and the Benshan Duanni purple clay needs to be sieved to 200 mesh.

[0038] S2. The Zhaozhuang Zhuni purple clay obtained in step S1 was mixed with the Benshan Duanni purple clay in a mass ratio of 15:85. Specifically, 0.6 kg of Zhaozhuang Zhuni purple clay and 3.4 kg of Benshan Duanni purple clay were placed in a blender and mixed for 30 minutes. The mixture was then further refined in a ball mill to obtain a binary purple clay mixture. The ball milling conditions were set at a speed of 500 rpm for 2 hours, using 5 mm zirconia balls as a grinding medium, and finally sieved to 400 mesh.

[0039] S3, add 30wt.% of pure water of the total amount of mud to the binary purple sand mixed mud obtained in step S2, use a mechanical vacuum mud kneading machine to knead mud until a uniform mud block is obtained. After the kneaded mud block is packaged, it is sent to the cellar for aging treatment, and the aging time is 2 months.

[0040] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1166°C. The sintering process is as follows: (1) heating from room temperature to 300°C at a heating rate of 3°C / min; (2) heating from 300°C to 800°C at a heating rate of 5°C / min, and dwelling at 800°C for 30 minutes; (3) heating from 800°C to the final temperature at a heating rate of 4°C / min, and dwelling at 1166°C for 8 hours; (4) cooling in the furnace to produce the purple clay sintered body for enhancing the aroma of tea.

[0041] Example 2

[0042] S1. Zhaozhuang Zhuni purple sand clay and Benshan Duanni purple sand clay are selected as the basic materials for preparing purple sand sintered bodies, wherein the Fe2O3 and MgO contents in the Zhaozhuang Zhuni purple sand clay and the trace element Mn content in the Benshan Duanni purple sand clay are the same as those in Example 1, and they are dried separately to ensure that the water content of the two clays is less than 10wt.%. Subsequently, the dried clays are crushed and sieved using a Raymond mill to further refine the particle size. Specifically, the Zhaozhuang Zhuni purple sand clay needs to be sieved to 100 mesh; while the Benshan Duanni purple sand clay needs to be sieved to 200 mesh.

[0043] S2. The Zhaozhuang Zhuni purple clay obtained in step S1 was mixed with the Benshan Duanni purple clay in a mass ratio of 5:95. Specifically, 0.2 kg of Zhaozhuang Zhuni purple clay and 3.8 kg of Benshan Duanni purple clay were placed in a blender and mixed for 30 minutes. The mixture was then further refined in a ball mill to obtain a binary purple clay mixture. The ball milling conditions were set at a speed of 500 rpm for 2 hours, using 5 mm zirconia balls as a grinding medium, and finally sieved to 400 mesh.

[0044] S3, add 30wt.% of pure water of the total amount of mud to the binary purple sand mixed mud obtained in step S2, use a mechanical vacuum mud kneading machine to knead mud until a uniform mud block is obtained. After the kneaded mud block is packaged, it is sent to the cellar for aging treatment, and the aging time is 2 months.

[0045] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1166°C. The sintering process is as follows: (1) heating from room temperature to 300°C at a heating rate of 3°C / min; (2) heating from 300°C to 800°C at a heating rate of 5°C / min, and staying at 800°C for 30 minutes; (3) heating from 800°C to the final temperature at a heating rate of 4°C / min, and staying at 1166°C for 8 hours; (4) cooling in the furnace to produce the purple clay sintered body for enhancing the aroma of tea.

[0046] Example 3

[0047] S1. Zhaozhuang Zhuni purple sand clay and Benshan Duanni purple sand clay are selected as the basic materials for preparing purple sand sintered bodies, wherein the Fe2O3 and MgO contents in the Zhaozhuang Zhuni purple sand clay and the trace element Mn content in the Benshan Duanni purple sand clay are the same as those in Example 1, and they are dried separately to ensure that the water content of the two clays is less than 10 wt.%. Subsequently, the dried clays are crushed and sieved using a Raymond mill to further refine the particle size. Specifically, the Zhaozhuang Zhuni purple sand clay needs to be sieved to 100 mesh; and the Benshan Duanni purple sand clay needs to be sieved to 200 mesh.

[0048] S2, the Zhaozhuang red clay purple sand clay obtained in step S1 and the Benshan Duan clay purple sand clay were mixed in a mass ratio of 30:70. Specifically, 1.2 kg of Zhaozhuang red clay purple sand clay and 2.8 kg of Benshan Duan clay purple sand clay were put into a blender and mixed for 30 minutes, and then transferred to a ball mill for further refinement to obtain a mixed clay material of binary purple sand. The ball milling conditions were set to a speed of 500 rpm, a time of 2 hours, using 5 mm zirconia balls as a grinding medium, and finally sieved to 400 mesh.

[0049] S3, add 30wt.% of pure water of the total amount of mud to the binary purple sand mixed mud obtained in step S2, use a mechanical vacuum mud kneading machine to knead mud until a uniform mud block is obtained. After the kneaded mud block is packaged, it is sent to the cellar for aging treatment, and the aging time is 2 months.

[0050] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1166°C. The sintering process is as follows: (1) heating from room temperature to 300°C at a heating rate of 3°C / min; (2) heating from 300°C to 800°C at a heating rate of 5°C / min, and staying at 800°C for 30 minutes; (3) heating from 800°C to the final temperature at a heating rate of 4°C / min, and staying at 1166°C for 8 hours; (4) cooling in the furnace to produce the purple clay sintered body for enhancing the aroma of tea.

[0051] Example 4

[0052] S1. Zhaozhuang Zhuni purple sand clay and Benshan Duanni purple sand clay are selected as the basic materials for preparing purple sand sintered bodies, wherein the Fe2O3 and MgO contents in the Zhaozhuang Zhuni purple sand clay and the trace element Mn content in the Benshan Duanni purple sand clay are the same as those in Example 1, and they are dried separately to ensure that the water content of the two clays is less than 10 wt.%. Subsequently, the dried clays are crushed and sieved using a Raymond mill to further refine the particle size. Specifically, the Zhaozhuang Zhuni purple sand clay needs to be sieved to 100 mesh; and the Benshan Duanni purple sand clay needs to be sieved to 200 mesh.

[0053] S2. The Zhaozhuang Zhuni purple clay obtained in step S1 was mixed with the Benshan Duanni purple clay in a mass ratio of 15:85. Specifically, 0.6 kg of Zhaozhuang Zhuni purple clay and 3.4 kg of Benshan Duanni purple clay were placed in a blender and mixed for 30 minutes. The mixture was then further refined in a ball mill to obtain a binary purple clay mixture. The ball milling conditions were set at a speed of 500 rpm for 2 hours, using 5 mm zirconia balls as a grinding medium, and finally sieved to 400 mesh.

[0054] S3, add 30 wt.% of pure water of the total amount of mud to the binary purple sand mixed mud obtained in step S2, use a mechanical vacuum mud kneading machine to knead mud until a uniform mud block is obtained. After the kneaded mud block is packaged, it is sent to the cellar for stale treatment, and the stale time is 2 months.

[0055] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1000°C. The sintering process is as follows: (1) heating from room temperature to 300°C at a heating rate of 3°C / min; (2) heating from 300°C to 800°C at a heating rate of 5°C / min, and staying at 800°C for 30 minutes; (3) heating from 800°C to the final temperature at a heating rate of 4°C / min, and staying at 1000°C for 8 hours; (4) cooling in the furnace to produce the purple clay sintered body for enhancing the aroma of tea.

[0056] Example 5

[0057] S1. Zhaozhuang Zhuni purple clay and Benshan Duanni purple clay were selected as base materials for preparing purple clay sintered bodies. The Fe2O3 and MgO contents in the Zhaozhuang Zhuni purple clay and the trace element Mn content in the Benshan Duanni purple clay were the same as those in Example 1. The clays were dried to ensure that their water content was less than 10 wt.%. Subsequently, the dried clays were crushed and sieved using a Raymond mill to further refine the particle size. Specifically, the Zhaozhuang Zhuni purple clay was sieved to 100 mesh, while the Benshan Duanni purple clay was sieved to 200 mesh.

[0058] S2. The Zhaozhuang Zhuni purple clay obtained in step S1 was mixed with the Benshan Duanni purple clay in a mass ratio of 15:85. Specifically, 0.6 kg of Zhaozhuang Zhuni purple clay and 3.4 kg of Benshan Duanni purple clay were placed in a blender and mixed for 30 minutes. The mixture was then further refined in a ball mill to obtain a binary purple clay mixture. The ball milling conditions were set at a speed of 500 rpm for 2 hours, using 5 mm zirconia balls as a grinding medium, and finally sieved to 400 mesh.

[0059] S3, add 30wt.% of pure water of the total amount of mud to the binary purple sand mixed mud obtained in step S2, use a mechanical vacuum mud kneading machine to knead mud until a uniform mud block is obtained. After the kneaded mud block is packaged, it is sent to the cellar for aging treatment, and the aging time is 2 months.

[0060] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1300°C. The sintering process is as follows: (1) heating from room temperature to 300°C at a heating rate of 3°C / min; (2) heating from 300°C to 800°C at a heating rate of 5°C / min, and staying at 800°C for 30 minutes; (3) heating from 800°C to the final temperature at a heating rate of 4°C / min, and staying at 1300°C for 8 hours; (4) cooling in the furnace to produce the purple clay sintered body for enhancing the aroma of tea.

[0061] 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, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0062] Performance testing:

[0063] The clay blocks after the processes S1 to S3 of Examples 1, 2 and 3 of the present invention and the Zhaozhuang Zhuni purple clay and Benshan Duanni purple clay used in Examples 1-5 were subjected to X-ray fluorescence spectrometer (XRF) chemical composition analysis, and the results are shown in Table 1.

[0064] Table 1 Chemical composition analysis of the clay blocks after the processes S1 to S3 of Examples 1-3 of the present invention and the Zhaozhuang Zhuni purple clay and Benshan Duanni purple clay used in Examples 1-5

[0065]

[0066] As can be seen from Table 1, in Example 1 of the present invention, the Zhaozhuang Zhuni purple clay material and the Benshan Duanni purple clay material are uniformly mixed and the chemical composition of the clay material is changed through steps S1 to S3. The addition of Zhaozhuang Zhuni purple clay material increases the content of iron (derived from Fe2O3) and magnesium (derived from MgO), while the addition of Benshan Duanni purple clay material increases the content of manganese (Mn).

[0067] The sintered body prepared in Example 1 was subjected to SEM test analysis and regional EDS spectrum analysis. The results are shown in Figure 1-Figure 3 ;

[0068] The sintered body prepared in Example 4 was subjected to SEM test analysis and regional EDS spectrum analysis. The results are shown in Figure 4-Figure 6 ;

[0069] The sintered body prepared in Example 5 was subjected to SEM test analysis and regional EDS spectrum analysis. The results are shown in Figure 7-Figure 9 .

[0070] The difference between the preparation processes of Example 1, Example 4 and Example 5 is that the final sintering temperature is different. Figure 1-Figure 3 It can be seen that under the same conditions, the number of channels produced at different final sintering temperatures is different, and the contents of iron, manganese and magnesium in the channels are also different. The results show that in Example 1, under the appropriate binary mud ratio and the appropriate sintering temperature, a large number of channel structures will be produced on the surface of the sintered body, and at the same time, high content of iron, manganese and magnesium will be enriched in the channels.

[0071] The radar chart of flavor substances dissolved in tea soup in different containers was obtained by gas chromatography-mass spectrometry (GC-MS) testing method, including the white porcelain cup and the sintered cup of Examples 1-5 of the present invention. The results are shown in FIG. Figure 10 .

[0072] The integrated peak areas of flavor substances extracted from tea soup in different containers, including white porcelain cups and sintered cups of Examples 1-5 of the present invention, were semi-quantitatively determined by gas chromatography-mass spectrometry (GC-MS). The results are shown in Table 2.

[0073] Table 2 The peak integral areas of flavor substances dissolved in tea soup in different containers

[0074]

[0075] Figure 10Table 2 shows that tea infusions in binary purple clay sintered bodies, which have pores rich in iron, manganese, and magnesium, contain significantly higher levels of unique flavor extractables than tea in white porcelain. This demonstrates that optimal binary clay ratios and sintering temperatures can yield significant flavor extractables.

[0076] This is because the present invention is based on the principle that iron ions act as catalysts to promote the oxidation reaction of polyphenols in tea. Specifically, the divalent iron ions in the sintered body react with polyphenols to form iron-polyphenol complexes, which in turn oxidize the polyphenols to produce quinone compounds. These quinone compounds can further oxidize to form aldehyde aroma compounds or react with amino acids, proteins, and other substances, ultimately changing the flavor of the tea.

[0077] Natural purple clay is usually rich in iron, but the catalytic efficiency of iron alone is limited. Therefore, the present invention introduces transition metals such as manganese and alkaline earth metals such as magnesium to form a multi-metal catalytic system to accelerate the catalytic reaction of iron and accelerate the production of quinone compounds. Different types of purple clay have unique properties due to the different enriched metal contents. The present invention selects Zhaozhuang Zhuni clay, which is rich in iron and magnesium, and Benshan Duanni clay, which is rich in manganese, to mix them, and by adjusting the mass ratio of the two, constructs an iron-based multi-metal catalytic system. Specifically, the Fe2O3 content in Zhaozhuang Zhuni purple clay is not less than 8.5 wt.% and the MgO content is not less than 1.0 wt.%, and the trace element Mn content in Benshan Duanni purple clay is not less than 40 mg / kg. Furthermore, by optimizing the sintering process and creating a confined space, the synergistic effect of the multi-metal catalyst is enhanced, thereby significantly improving the efficiency of generating tea flavor substances.

[0078] At high temperatures, magnesium has a certain reducing effect, promoting the reaction between iron and manganese at lower temperatures. Low-valent manganese accelerates the oxidation of divalent iron in saturated air, accelerating the production of quinone compounds. Simultaneously, controlling the sintering temperature creates pores within which the iron, manganese, and magnesium are concentrated. This confinement enhances the catalytic effect, ultimately achieving the dual-component purple clay's enhanced effect on tea flavor.

[0079] The present invention sets a limit on the firing temperature and time: during the firing process, the final temperature is set at 1000-1300°C. The sintering system is as follows: (1) heating from room temperature to 300°C at a heating rate of 3°C / min; (2) heating from 300°C to 800°C at a heating rate of 5°C / min, and staying at 800°C for 30 min; (3) heating from 800°C to the final temperature at a heating rate of 4°C / min, and staying at the final temperature for 8 h; (4) cooling with the furnace. In the sintering system of the present invention, the setting of the final temperature will affect whether the three metal oxides of iron, manganese and magnesium react fully, and also affect the formation of the pore structure on the surface of the purple clay. If the temperature is too low, on the one hand, the three metal oxides of iron, manganese and magnesium are not melted and the reaction is not sufficient, and they do not have catalytic activity. On the other hand, the large amount of silicate present in the purple clay cannot be melted to form pores under the solubility of alkaline earth metals. However, if the temperature is too high, a large amount of mullite phase will be generated to wrap the metal oxide, inhibiting the catalytic activity.

[0080] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a purple sand sintered body for enhancing the aroma of tea, characterized in that: The following steps are involved: S1. Grind and sieve Zhaozhuang Zhuni purple clay and Benshan Duanni purple clay separately, wherein the Fe2O3 content of the Zhaozhuang Zhuni purple clay is not less than 8.5 wt.% and the MgO content is not less than 1.0 wt.%, and the trace element Mn content of the Benshan Duanni purple clay is not less than 40 mg / kg; S2, uniformly mixing the Zhaozhuang Zhuni purple clay material and the Benshan Duanni purple clay material obtained in step S1 according to a proportion to obtain a binary purple clay mixture, wherein the mass ratio of the Zhaozhuang Zhuni purple clay material to the Benshan Duanni purple clay material is (5-30):(95-70); S3, adding pure water to the binary purple sand mixed clay obtained in step S2, and performing vacuum kneading to obtain clay blocks; S4. Pressing the clay block obtained in step S3 into a green body, and biscuit firing the green body to obtain the purple clay sintered body, wherein the biscuit firing final temperature of the green body is set at 1000-1300°C.

2. The method for preparing a purple clay sintered body for enhancing the aroma of tea according to claim 1, characterized in that: In step S1, a Raymond mill is used for crushing and screening, wherein the Zhaozhuang Zhuni purple clay material is sieved to 100 mesh, and the Benshan Duanni purple clay material is sieved to 200 mesh.

3. The method for preparing a purple clay sintered body for enhancing the aroma of tea according to claim 1, characterized in that: In step S2: the Zhaozhuang Zhuni purple clay material and the Benshan Duanni purple clay material are stirred and mixed for 30 minutes and then ball-milled; the ball-milling speed is 500 rpm, the ball-milling time is 2 hours, the grinding medium of the ball mill is 5 mm zirconia balls, and the sieve mesh number is 400 mesh.

4. The method for preparing a purple clay sintered body for enhancing the aroma of tea according to claim 1, characterized in that: In step S3: pure water accounting for 30 wt.% of the total weight of the binary purple clay mixture is added to the binary purple clay mixture, and a mechanical vacuum clay kneading machine is used to knead the clay to obtain a clay block, and the obtained clay block is aged for a period of more than 1 month.

5. The method for preparing a purple clay sintered body for enhancing the aroma of tea according to claim 1, characterized in that: In step S4, the bisque firing of the green body is specifically as follows: heating from room temperature to 300°C at a heating rate of 3°C / min; then heating from 300°C to 800°C at a heating rate of 5°C / min, and staying at 800°C for 30 minutes; finally heating from 800°C to 1000-1300°C at a heating rate of 4°C / min, and staying for 8 hours; and cooling in the furnace to obtain the purple clay sintered body for enhancing the aroma of tea.

6. A purple clay sintered body for enhancing the aroma of tea, characterized in that: The tea soup fragrance enhancing purple clay sintered body is prepared by the preparation method of any one of claims 1 to 5.

7. Use of the purple clay sintered body for enhancing the aroma of tea as claimed in claim 6 in brewing tea beverages.

Images