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

Abstract

The application provides a purple sand sintered body for coffee flavoring and a preparation method and application thereof, and belongs to the technical field of purple sand materials. The purple sand sintered body for coffee flavoring is prepared by mixing and sintering small coal mine red clay purple sand clay and Ben Shan red clay purple sand clay at a mass ratio of (80-50):(20-50), wherein the content of Fe2O3 in the Ben Shan red clay purple sand clay is not less than 9.0 wt.%, the content of trace element Cu in the small coal mine red clay purple sand clay is not less than 40 mg / kg, and the content of K2O is not less than 2.5 wt.%. The purple sand sintered body for coffee flavoring does not need to add other preparations, and only needs to mix the small coal mine red clay purple sand clay rich in copper and potassium and the Ben Shan red clay purple sand clay rich in iron, adjust the mass ratio of the two, and construct an iron-based multi-element catalytic system. Further, by optimizing the sintering process, a limited space is created, the synergistic effect of the multi-element metal catalyst is enhanced, and the generation efficiency of coffee flavoring substances is 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 coffee aroma, 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 seeking healthy and natural beverage experiences. Zisha vessels are favored for their natural, breathable, and aesthetic qualities. Especially in tea brewing, the aroma-enhancing and taste-enhancing effects of Zisha are widely recognized. However, the application of Zisha in the coffee industry has not yet become widespread, primarily due to a lack of research on the interaction between Zisha and coffee flavor.

[0003] Patent publication number CN108751932A discloses a purple clay material with health benefits and a cold brew coffee pot using it. The process involves mixing calcite powder, actinolite powder, tourmaline powder, and Bian stone powder with purple clay powder, stirring them evenly to form a blank, which is then dried, fired, and naturally cooled to obtain the finished product. The patent's innovation lies in the addition of minerals with health benefits to the purple clay material. For example, Bian stone makes water weakly alkaline, actinolite and calcite release pharmacological compounds, and tourmaline activates water and releases negative ions. Furthermore, the cold brew coffee pot's structural design ensures health benefits and excellent sealing.

[0004] However, adding other minerals to the purple clay teapot can alter its texture, appearance, and brewing properties. Furthermore, the minerals added in this paper are all for health benefits, and the purple clay teapots do not alter the coffee flavor or the content of coffee flavoring substances.

[0005] Therefore, it is necessary to develop a purple clay sintered body for coffee aroma enhancement, which can enrich people's experience of coffee flavor and meet the market demand for healthy and natural beverage containers. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a method for preparing a purple sand sintered body for enhancing the aroma of coffee, and a preparation method and application thereof.

[0007] The present invention provides the following technical solutions:

[0008] The present invention provides a method for preparing a purple sand sintered body for enhancing coffee aroma, comprising the following steps:

[0009] S1. Grind and sieve Xiaomeiyao Zhuni purple clay and Benshan Zhuni purple clay separately, wherein the Benshan Zhuni purple clay has an Fe2O3 content of not less than 9.0 wt.%, and the Xiaomeiyao Zhuni purple clay has a trace element Cu content of not less than 40 mg / kg and a K2O content of not less than 2.5 wt.%.

[0010] S2. Evenly mix the Xiaomeiyao Zhuni purple sand clay material obtained in step S1 with the Benshan Zhuni purple sand clay material according to a proportion to obtain a binary purple sand mixed clay material, wherein the mass ratio of the Xiaomeiyao Zhuni purple sand clay material to the Benshan Zhuni purple sand clay material is (80-50):(20-50);

[0011] S3, adding pure water to the binary purple sand mixed clay obtained in step S2, and performing vacuum kneading to obtain clay blocks;

[0012] 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.

[0013] Furthermore, in step S1, a Raymond mill is used for crushing and screening, wherein the Xiaomeiyao Zhuni and Zisha clay materials are sieved to 100 mesh, and the Benshan Zhuni and Zisha clay materials are sieved to 100 mesh.

[0014] Furthermore, in step S2: the Xiaomeiyao Zhuni purple clay material and the Benshan Zhuni purple clay material are stirred and mixed for 30 minutes and then ball-milled; the ball milling speed is 600 rpm; the ball milling time is 2 hours; the grinding medium is 3mm zirconia balls; and the sieve mesh number is 300 meshes.

[0015] Furthermore, 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 clay blocks, and the obtained clay blocks are aged for a period of more than 2 months.

[0016] Furthermore, in step S4, the bisque firing of the green body is specifically performed as follows: the green body is fired at a temperature of 1000-1250°C. The temperature is raised from room temperature to 300°C at a heating rate of 3°C / min; then the temperature is raised from 300°C to 800°C at a heating rate of 5°C / min, and the temperature is held at 800°C for 30 minutes; finally, the temperature is raised from 800°C to the final temperature at a heating rate of 4°C / min, and the temperature is held at the final temperature for 6 hours; and the green body is cooled in the furnace to obtain the purple clay sintered body for coffee aroma enhancement.

[0017] The present invention also provides a coffee-aroma-enhancing purple sand sintered body produced by the above-mentioned preparation method.

[0018] The present invention also provides application of the coffee aroma-enhancing purple clay sintered body in coffee beverages.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention eliminates the need for additional additives. Instead, it selects two natural purple clay materials: the iron-rich Benshan Zhuni purple clay and the copper- and potassium-rich Xiaomeiyao Zhuni purple clay. By defining the mass ratio of these two materials, a multi-metal catalyst system based on iron and potassium is constructed. Furthermore, by defining the sintering process to create pores and confined spaces, the synergistic effect of the multi-metal catalysts is enhanced, significantly improving the efficiency of coffee flavor generation. The purple clay sintered body used for coffee aroma enhancement retains the original appearance and properties of purple clay while also increasing the amount of flavor in coffee, enriching the coffee flavor experience and remaining non-toxic and harmless to the human body.

[0021] The purple clay sintered body in the present invention has an effect on the flavor substances of coffee, mainly because iron ions act as catalysts, which can promote the oxidation reaction of polyphenols in coffee. Specifically, the divalent iron ions in the sintered body can react with polyphenols to form iron-polyphenol complexes, thereby oxidizing the polyphenols to generate quinone compounds. These quinone compounds can further participate in the oxidation reaction to form aldehyde aroma substances, or react with amino acids, proteins, etc., and ultimately change the flavor of coffee. Divalent copper has a higher redox potential, which will accelerate the oxidation of divalent iron, thereby accelerating the generation of quinone compounds. At the same time, for the control of sintering temperature, the purple clay sintered body can produce pores, and both iron and copper are enriched in the pores, and the catalytic effect is enhanced by the confinement effect, thereby achieving the flavor enhancement effect of the binary purple clay material on coffee. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the SEM image of the sintered body prepared in Example 1;

[0023] Figure 2 for Figure 1 EDS spectrum of the middle spot1 area;

[0024] Figure 3 for Figure 1 EDS spectrum of the middle spot2 area;

[0025] Figure 4 This is an SEM image of the sintered body prepared in Example 4;

[0026] Figure 5 for Figure 4 EDS spectrum of the middle spot1 area;

[0027] Figure 6 for Figure 4 EDS spectrum of the middle spot2 area;

[0028] Figure 7 This is an SEM image of the sintered body prepared in Example 5;

[0029] Figure 8for Figure 7 EDS spectrum of the middle spot1 area;

[0030] Figure 9 for Figure 7 EDS spectrum of the middle spo2 region;

[0031] Figure 10 The radar graphs of flavor substances dissolved in coffee in different containers, including glass cups and sintered cups of Examples 1 to 5 of the present invention, were measured by gas chromatography-mass spectrometry (GC-MS). DETAILED DESCRIPTION

[0032] 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.

[0033] Example 1

[0034] The steps for preparing the purple sand sintered material for coffee aroma enhancement are as follows:

[0035] S1. Select Xiaomeiyao Zhuni purple clay and Benshan Zhuni purple clay as the basic materials for preparing purple clay sintered bodies, wherein the Fe2O3 content of the Benshan Zhuni purple clay is not less than 9.0wt.%, and the trace element Cu content of the Xiaomeiyao Zhuni purple clay is not less than 40 mg / kg and the K2O content is not less than 2.5wt.%; 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 Xiaomeiyao Zhuni purple clay needs to be sieved to 100 mesh; and the Benshan Zhuni purple clay needs to be sieved to 100 mesh.

[0036] S2. The Xiaomeiyao Zhuni purple clay material and the Benshan Zhuni purple clay material obtained in step S1 were mixed in a mass ratio of 60:40. Specifically, 2.4 kg of Xiaomeiyao Zhuni purple clay material and 1.6 kg of Benshan Zhuni purple clay material 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 600 rpm for 2 hours using 3 mm zirconia balls as the grinding medium, and the mixture was finally sieved to 300 mesh.

[0037] 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.

[0038] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1160°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 1160°C at a heating rate of 4°C / min, and staying at the final temperature for 6 hours; (4) cooling in the furnace to produce the purple clay sintered body for coffee aroma enhancement.

[0039] Example 2

[0040] S1. Select Xiaomeiyao Zhuni purple sand clay and Benshan Zhuni purple sand clay as the basic materials for preparing purple sand sintered bodies, wherein the Fe2O3 content in the Benshan Zhuni purple sand clay and the trace element Cu content and K2O content in the Xiaomeiyao Zhuni purple sand clay are the same as those in Example 1, 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 Xiaomeiyao Zhuni purple sand clay needs to be sieved to 100 mesh; while the Benshan Zhuni purple sand clay needs to be sieved to 100 mesh.

[0041] S2. The Xiaomeiyao Zhuni purple sand clay material and the Benshan Zhuni purple sand clay material obtained in step S1 are mixed in a mass ratio of 80:20. Specifically, 3.2 kg of Xiaomeiyao Zhuni purple sand clay material and 0.8 kg of Benshan Zhuni purple sand clay material are put into a blender and mixed for 30 minutes, and then transferred to a ball mill for further refinement to obtain a mixed mud material of binary purple sand. The ball milling conditions are set to a speed of 600 rpm and a time of 2 hours. 3 mm zirconia balls are used as grinding media, and finally sieved to 300 mesh. S3. Pure water of 30 wt.% of the total amount of mud is added to the binary purple sand mixed mud material obtained in step S2, and a mechanical vacuum mud kneader is used to knead the 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.

[0042] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1160°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 1160°C at a heating rate of 4°C / min, and dwelling at the final temperature for 6 hours; (4) cooling in the furnace to produce the purple clay sintered body for coffee aroma enhancement.

[0043] Example 3

[0044] S1. Select Xiaomeiyao Zhuni purple sand clay and Benshan Zhuni purple sand clay as the basic materials for preparing purple sand sintered bodies, wherein the Fe2O3 content in the Benshan Zhuni purple sand clay and the trace element Cu content and K2O content in the Xiaomeiyao Zhuni 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 Xiaomeiyao Zhuni purple sand clay needs to be sieved to 100 mesh; while the Benshan Zhuni purple sand clay needs to be sieved to 100 mesh.

[0045] S2. The Xiaomeiyao Zhuni purple sand clay material and the Benshan Zhuni purple sand clay material obtained in step S1 are mixed in a mass ratio of 50:50. Specifically, 2.0 kg of Xiaomeiyao Zhuni purple sand clay material and 2.0 kg of Benshan Zhuni purple sand clay material are put into a blender and mixed for 30 minutes, and then transferred to a ball mill for further refinement to obtain a mixed mud material of binary purple sand. The ball milling conditions are set to a speed of 600 rpm and a time of 2 hours. 3 mm zirconia balls are used as grinding media, and finally sieved to 300 mesh. S3. Pure water of 30 wt.% of the total amount of mud is added to the binary purple sand mixed mud material obtained in step S2, and a mechanical vacuum mud kneader is used to knead the 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.

[0046] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1160°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 1160°C at a heating rate of 4°C / min, and dwelling at the final temperature for 6 hours; (4) cooling in the furnace to produce the purple clay sintered body for coffee aroma enhancement.

[0047] Example 4

[0048] S1. Select Xiaomeiyao Zhuni purple sand clay and Benshan Zhuni purple sand clay as the basic materials for preparing purple sand sintered bodies, wherein the Fe2O3 content in the Benshan Zhuni purple sand clay and the trace element Cu content and K2O content in the Xiaomeiyao Zhuni 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 Xiaomeiyao Zhuni purple sand clay needs to be sieved to 100 mesh; while the Benshan Zhuni purple sand clay needs to be sieved to 100 mesh.

[0049] S2. The Xiaomeiyao Zhuni purple clay material and the Benshan Zhuni purple clay material obtained in step S1 were mixed in a mass ratio of 60:40. Specifically, 2.4 kg of Xiaomeiyao Zhuni purple clay material and 1.6 kg of Benshan Zhuni purple clay material 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 600 rpm for 2 hours using 3 mm zirconia balls as the grinding medium, and the mixture was finally sieved to 300 mesh.

[0050] 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.

[0051] 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 dwelling at 800°C for 30 minutes; (3) heating from 800°C to 1000°C at a heating rate of 4°C / min, and dwelling at the final temperature for 6 hours; (4) cooling in the furnace to produce the purple clay sintered body for coffee aroma enhancement.

[0052] Example 5

[0053] S1. Select Xiaomeiyao Zhuni purple sand clay and Benshan Zhuni purple sand clay as the basic materials for preparing purple sand sintered bodies, wherein the Fe2O3 content in the Benshan Zhuni purple sand clay and the trace element Cu content and K2O content in the Xiaomeiyao Zhuni 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 Xiaomeiyao Zhuni purple sand clay needs to be sieved to 100 mesh; while the Benshan Zhuni purple sand clay needs to be sieved to 100 mesh.

[0054] S2. The Xiaomeiyao Zhuni purple clay material and the Benshan Zhuni purple clay material obtained in step S1 were mixed in a mass ratio of 60:40. Specifically, 2.4 kg of Xiaomeiyao Zhuni purple clay material and 1.6 kg of Benshan Zhuni purple clay material 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 600 rpm for 2 hours using 3 mm zirconia balls as the grinding medium, and the mixture was finally sieved to 300 mesh.

[0055] 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.

[0056] S4. Press the aged clay blocks into green bodies. During the firing process, the final temperature is set at 1250°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 1250°C at a heating rate of 4°C / min, and dwelling at the final temperature for 6 hours; (4) cooling in the furnace to produce the purple clay sintered body for coffee aroma enhancement.

[0057] 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.

[0058] Performance testing:

[0059] The mud blocks after the S1 to S3 processes of Examples 1, 2 and 3 of the present invention and the Xiaomeiyao Zhuni purple clay materials and Benshan Zhuni purple clay materials used in Examples 1-5 were subjected to X-ray fluorescence spectrometer (XRF) chemical composition analysis, and the results are shown in Table 1.

[0060] Table 1

[0061]

[0062] As can be seen from Table 1, in Example 1 of the present invention, the Xiaomeiyao Zhuni purple clay material and the Benshan Zhuni purple clay material are uniformly mixed and the chemical composition of the clay materials is changed through steps S1 to S3. The addition of Xiaomeiyao Zhuni purple clay material increases the content of copper (derived from Cu) and potassium (K2O), while the addition of Benshan Zhuni purple clay material increases the content of iron (derived from Fe2O3).

[0063] 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 ;

[0064] 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 ;

[0065] 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 .

[0066] 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 content of iron and copper in the channels is also different. The results show that in Example 1, when a suitable binary clay ratio and a suitable sintering temperature are selected, 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 and copper will be enriched in the channels.

[0067] The radar charts of flavor substances dissolved in coffee in different containers, including glass cups and sintered cups of Examples 1-5 of the present invention, were obtained by gas chromatography-mass spectrometry (GC-MS) testing method. The results are shown in FIG. Figure 10 .

[0068] The integrated peak areas of flavor substances extracted from coffee in different containers, including glass cups and sintered cups of Examples 1-5 of the present invention, were semi-quantitatively determined using gas chromatography-mass spectrometry (GC-MS). The results are shown in Table 2.

[0069] Table 2 Peak integral areas of flavor substances dissolved in coffee in different containers

[0070]

[0071] Figure 10 Table 2 shows that coffee fired in a binary purple clay sintered body with iron- and copper-rich pores significantly increases the content of unique flavor extractables compared to glass. Furthermore, optimal flavor extractability is achieved through the appropriate binary clay ratio and sintering temperature.

[0072] The effect of the purple clay sintered body on coffee flavor is primarily due to the iron ions acting as a catalyst, promoting the oxidation reaction of polyphenols in coffee. 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 participate in oxidation reactions to form aldehyde aroma compounds, or react with amino acids, proteins, and other substances, ultimately changing the flavor of the coffee. Divalent copper, with its high redox potential, accelerates the oxidation of divalent iron, thereby accelerating the formation of quinone compounds.

[0073] 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 copper to form a multi-metal catalytic system to accelerate the catalytic reaction of iron. Different types of purple clay have unique properties due to the different enriched metal contents. The present invention selects Xiaomeiyao Zhuni purple clay rich in copper and potassium and Benshan Zhuni purple clay rich in iron to mix, and constructs an iron-based multi-catalytic system by adjusting the mass ratio of the two. Specifically, the Fe2O3 content in Benshan Zhuni purple clay is not less than 9.0wt.%, the trace element Cu content in Xiaomeiyao Zhuni purple clay is not less than 40 mg / kg and the K2O content is not less than 2.5wt.%. Furthermore, by optimizing the sintering process, creating a confined space, and enhancing the synergistic effect of the multi-metal catalyst, the generation efficiency of coffee flavor substances is significantly improved.

[0074] The present invention sets a limit on the firing temperature and time: the final temperature setting temperature is 1000-1250℃. The sintering system is as follows: (1) heating from room temperature to 300℃ at a heating rate of 3℃ / min; (2) heating from 300℃ to 800℃ at a heating rate of 5℃ / min, and staying at 800℃ for 30 minutes; (3) heating from 800℃ to the final temperature at a heating rate of 4℃ / min, and staying at the final temperature for 6 hours; (4) cooling with the furnace. In the present invention, the setting of the final temperature will affect whether the iron-copper metal oxides react and melt fully, and also affect the formation of the pore structure on the surface of the purple clay. At a suitable temperature, potassium promotes the melting of iron-copper at a lower temperature, and at the same time promotes the melting of aluminosilicates present in a large amount in the purple clay under the action of potassium solubilization to produce pores. If the temperature is too low, on the one hand, iron and copper do not melt and react, and have no catalytic activity, and on the other hand, aluminosilicates fail to melt and produce pores under the alkaline earth metal solubility. However, when the temperature is too high, a large amount of mullite phase will be generated to wrap the metal, inhibiting the catalytic activity.

[0075] 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 coffee aroma enhancement, characterized in that: The following steps are involved: S1. Grind and sieve Xiaomeiyao Zhuni purple clay and Benshan Zhuni purple clay separately, wherein the Benshan Zhuni purple clay has an Fe2O3 content of not less than 9.0 wt.%, and the Xiaomeiyao Zhuni purple clay has a trace element Cu content of not less than 40 mg / kg and a K2O content of not less than 2.5 wt.%. S2. Evenly mix the Xiaomeiyao Zhuni purple sand clay material obtained in step S1 with the Benshan Zhuni purple sand clay material according to a proportion to obtain a binary purple sand mixed clay material, wherein the mass ratio of the Xiaomeiyao Zhuni purple sand clay material to the Benshan Zhuni purple sand clay material is (80-50):(20-50); S3, adding pure water to the binary purple sand mixed clay obtained in step S2, and performing vacuum kneading to obtain clay blocks; S4. Press the clay block obtained in step S3 into a green body, and then bisque-fire it to obtain the purple clay sintered body. The firing temperature of the green body is 1000-1250°C.

2. The method for preparing a purple clay sintered body for coffee aroma enhancement according to claim 1, wherein: In step S1, a Raymond mill is used for crushing and screening, wherein the Xiaomeiyao Zhuni and Zisha clay materials are sieved to 100 mesh, and the Benshan Zhuni and Zisha clay materials are sieved to 100 mesh.

3. The method for preparing a purple clay sintered body for coffee aroma enhancement according to claim 1, wherein: In step S2: the Xiaomeiyao Zhuni purple clay material and the Benshan Zhuni purple clay material are stirred and mixed for 30 minutes and then ball-milled; the ball-milling speed is 600 rpm; the ball-milling time is 2 hours; the grinding medium is 3 mm zirconium oxide balls; and the sieve mesh number is 300 meshes.

4. The method for preparing a purple clay sintered body for coffee aroma enhancement according to claim 1, wherein: 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 clay blocks, and the obtained clay blocks are aged for a period of more than 2 months.

5. The method for preparing a purple clay sintered body for coffee aroma enhancement according to claim 1, wherein: 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 the final temperature at a heating rate of 4°C / min, and staying at the final temperature for 6 hours; and cooling in the furnace to obtain the purple clay sintered body for enhancing coffee aroma.

6. A purple sand sintered body for coffee aroma enhancement, characterized in that: The coffee aroma enhancing product is prepared by the method for preparing the purple clay sintered body for coffee aroma enhancement according to any one of claims 1 to 5.

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

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