Preparation method of special tricalcium phosphate for cheese

Abstract

The invention discloses a preparation method of special tricalcium phosphate for cheese, which comprises the following steps: S1, reacting a carbonic acid source and a calcium source in water to obtain calcium carbonate slurry; s2, mixing the calcium carbonate slurry with phosphoric acid for reaction, adding a solid active carrier supported acid catalyst, and reacting to obtain tricalcium phosphate; and S3, carrying out superfine grinding on the obtained tricalcium phosphate to obtain a tricalcium phosphate product. Calcium carbonate participates in a reaction in a solution state to improve reaction uniformity, then a solid active carrier is adopted to load an acid catalyst to further improve reaction activity, promote complete reaction, reduce calcium carbonate residues and improve the purity and taste of tricalcium phosphate, and finally superfine grinding is adopted to further improve the purity and taste of tricalcium phosphate. Therefore, the method can be better applied to cheese.

Description

Technical Field

[0001] The present invention belongs to the technical field of food processing, and particularly relates to a preparation method of tricalcium phosphate special for cheese. Background Art

[0002] Cheese is a food with rich nutritional value and popular among children. The market scale is gradually expanding and has entered a stage of high-quality development. The problem brought by the rapid growth is serious homogenization. To seek new ways out, the healthiness of product ingredients is an inevitable development trend. The most prominent product is the high-calcium cheese stick.

[0003] Tricalcium phosphate is a calcium nutritional fortifier with a theoretical calcium content of 34% - 40%, a phosphorus content of about 20%, and a calcium-phosphorus ratio of about 2:1. At this golden ratio, the calcium absorption rate is the highest, and it can supplement two nutrients, calcium and phosphorus at the same time. Therefore, it has also become the first choice of calcium supplement in the cheese industry.

[0004] At present, food-grade tricalcium phosphate is mostly synthesized from calcium hydroxide (or calcium carbonate) and phosphoric acid with a simple process. The prepared product can meet the applications in the conventional tablet and milk powder industries. However, due to the low product purity, there will be a small amount of calcium carbonate residue in the product, and there are problems such as poor taste and poor formability in the application in the cheese industry. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method of tricalcium phosphate special for cheese to solve the deficiencies of the prior art.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] A preparation method of tricalcium phosphate special for cheese includes the following steps:

[0008] S1. Take a carbon source and a calcium source to react in water to obtain a calcium carbonate slurry;

[0009] S2. Take the calcium carbonate slurry and phosphoric acid to react, and add a solid active carrier to load an acid catalyst, and react to obtain tricalcium phosphate;

[0010] S3. Ultrafinely pulverize the obtained tricalcium phosphate to obtain a tricalcium phosphate product.

[0011] Preferably, the carbon source in step S1 is selected from at least one of sodium carbonate and potassium carbonate;

[0012] The calcium source is at least one of calcium oxide and calcium chloride.

[0013] Preferably, the reaction temperature in step S1 is 70 - 80 °C, and the reaction molar ratio of the carbon source to the calcium source is (0.95 - 1.01):1;

[0014] After the reaction, solid-liquid separation is carried out. The calcium carbonate is taken, washed with water, and then solid-liquid separation is carried out again. Then, the calcium carbonate after the second solid-liquid separation is added to water to obtain the calcium carbonate slurry.

[0015] The mass percentage concentration of calcium carbonate in the calcium carbonate slurry is 5-10%.

[0016] Preferably, the active carrier in step S2 is activated alumina.

[0017] Preferably, the solid active carrier loaded with an acid catalyst in step S2 is prepared by the following method:

[0018] After drying the active carrier, it is impregnated with a phosphoric acid solution. After the impregnation is completed, it is allowed to stand for 8-10 h, dried again, and then calcined at 400-600 °C for 3-5 h.

[0019] Preferably, the drying temperature of the active carrier is 100-140 °C and the time is 1-3 h;

[0020] The temperature for the second drying is 100-120 °C and the time is 6-7 h;

[0021] The amount of the phosphoric acid solution used is 0.9-1.2 times the volume of the active carrier.

[0022] Preferably, the reaction temperature in step S2 is 70-80 °C, and the amounts of calcium carbonate and phosphoric acid used are in a molar ratio of (1.4-1.5):1;

[0023] The amount of the solid active carrier loaded with an acid catalyst used is 1-2% of the mass of the phosphoric acid.

[0024] Preferably, step S2 further includes:

[0025] First, the calcium carbonate slurry is heated to 70-80 °C, the solid active carrier loaded with an acid catalyst is added, and then phosphoric acid is slowly added dropwise. After the addition is completed, the mixture is kept warm and reacted for 20-40 min, and then filtered. The solution is concentrated until calcium phosphate tribasic precipitates, and then filtered to obtain the calcium phosphate tribasic.

[0026] Preferably, before the ultrafine grinding in step S3, drying is first carried out. The drying temperature is 120-130 °C and the drying time is 10-14 h.

[0027] Preferably, the ultrafine grinding is carried out until the average particle size of the calcium phosphate tribasic is 5-7 μm.

[0028] This application first makes calcium carbonate participate in the reaction in a solution state to improve the reaction uniformity, then uses a solid active carrier to load an acid catalyst to further improve the reaction activity, promote the complete reaction, reduce the calcium carbonate residue, improve the taste of tricalcium phosphate, and finally uses ultrafine grinding to further improve the taste of tricalcium phosphate so that it can be better applied to cheese.

[0029] The yield of tricalcium phosphate prepared by the method of this application can reach more than 96%, the purity is as high as more than 99%, the impurity content of which is lead ≤ 0.05 ppm, manganese ≤ 50 ppm, iron ≤ 50 ppm, there is no calcium carbonate residue, the taste is delicate, and the application performance in cheese products is better. Detailed implementation manners

[0030] The present invention provides a method for preparing tricalcium phosphate for special use in cheese, comprising the following steps:

[0031] S1. React a carbonic acid source and a calcium source to obtain a calcium carbonate slurry; the carbonic acid source and the calcium source can adopt conventional substances capable of generating calcium carbonate.

[0032] In the prior art, generally solid calcium carbonate is directly reacted with phosphoric acid in water. Since the solubility of calcium carbonate is small, it is easy to cause uneven reaction, slow reaction rate, incomplete reaction of calcium carbonate, and calcium carbonate residue. This application uses the synthesized calcium carbonate slurry to replace the reaction of conventional solid calcium carbonate with phosphoric acid. The calcium carbonate has higher activity, can make the reaction uniform and complete, reduce the calcium carbonate residue, and the product has high purity.

[0033] Preferably, the carbonic acid source is selected from at least one of sodium carbonate and potassium carbonate, and the calcium source is selected from at least one of calcium oxide and calcium chloride. Further, the reaction is carried out under heating conditions, the temperature is preferably 70 - 80 °C, and the reaction molar ratio of the carbonic acid source to the calcium source is (0.95 - 1.01):1.

[0034] After the reaction, solid-liquid separation is carried out. The calcium carbonate is taken, washed with water and then solid-liquid separated again. Then the calcium carbonate after the second solid-liquid separation is added to water to obtain a calcium carbonate slurry; impurities can be further removed by washing with water to improve the product purity.

[0035] Further, the washing with water is carried out at a high temperature to better remove impurities. The washing temperature with water is preferably 70 - 80 °C.

[0036] The mass percentage concentration of calcium carbonate in the calcium carbonate slurry is preferably 5 - 10%.

[0037] S2. Mix and react the calcium carbonate slurry and phosphoric acid, and add a solid active carrier to load an acid catalyst, and react to obtain tricalcium phosphate;

[0038] Adding a solid active carrier-supported acid catalyst can enhance the acidity and activity of phosphoric acid, further promote the reaction with calcium carbonate, and reduce the calcium carbonate residue. The active carrier can be activated alumina, etc. Activated alumina has a large specific surface area and can support more phosphoric acid, increasing the contact degree between calcium carbonate and phosphoric acid and promoting the reaction between calcium carbonate and phosphoric acid.

[0039] Preferably, the solid active carrier-supported acid catalyst is prepared by the following method:

[0040] After drying the active carrier, it is impregnated with a phosphoric acid solution. After impregnation, it is allowed to stand for 8 - 10 h to fully load the phosphoric acid on the active carrier, and then dried again. After that, it is calcined at 400 - 600 °C for 3 - 5 h to further improve the stability and activity of the catalyst.

[0041] Furthermore, the drying temperature of the active carrier is 100 - 140 °C and the time is 1 - 3 h; the temperature for the second drying is 100 - 120 °C and the time is 6 - 7 h; the dosage of the phosphoric acid solution is 0.9 - 1.2 times the volume of the active carrier.

[0042] Preferably, the reaction temperature in step S2 is 70 - 80 °C. Heating can further improve the reaction activity and promote the reaction; the dosage of calcium carbonate and phosphoric acid is (1.4 - 1.5):1 in terms of molar ratio, based on the content of calcium carbonate and phosphoric acid in the system. Phosphoric acid preferably uses a 75 - 86% food-grade phosphoric acid aqueous solution.

[0043] The dosage of the solid active carrier-supported acid catalyst is 1 - 2% of the mass of phosphoric acid. An appropriate dosage of the catalyst can not only improve the reaction activity and promote the reaction, but also not introduce excessive impurities to affect the product purity.

[0044] Under the above conditions, calcium carbonate and phosphoric acid can fully react to form tricalcium phosphate. With a slightly excessive amount of phosphoric acid in the reaction, it can ensure complete reaction of calcium carbonate, reduce the calcium carbonate residue, and improve the purity of tricalcium phosphate.

[0045] Preferably, step S2 further includes:

[0046] First, heat the calcium carbonate slurry to 70 - 80 °C, add the solid active carrier-supported acid catalyst, and then slowly dropwise add phosphoric acid. After dropping, continue to keep the temperature for reaction for 20 - 40 min. After that, filter, concentrate the solution until tricalcium phosphate precipitates, and then filter to obtain tricalcium phosphate.

[0047] S3. Ultrafinely pulverize the obtained tricalcium phosphate to obtain a tricalcium phosphate product.

[0048] After ultrafine pulverization, tricalcium phosphate can be pulverized to the micron level, improving the delicate texture of tricalcium phosphate and making it better applicable to cheese.

[0049] Preferably, before the ultrafine grinding in step S3, drying is first carried out to improve the grinding effect. The drying temperature is preferably 120-130°C, and the drying time is 10-14h. The ultrafine grinding equipment can adopt supersonic airflow grinding equipment, etc.

[0050] Ultrafine grind until the average particle size of tricalcium phosphate is 5-7μm.

[0051] Therefore, in this application, calcium carbonate is first involved in the reaction in a solution state to improve the reaction uniformity, and then a solid active carrier is used to load the acid catalyst to further improve the reaction activity, promote the reaction to be complete, reduce the calcium carbonate residue, improve the taste of tricalcium phosphate, and finally ultrafine grinding is adopted to further improve the taste of tricalcium phosphate, so that it can be better applied to cheese.

[0052] The yield of tricalcium phosphate prepared by the method of this application can reach more than 96%, the purity is as high as more than 99%, among which the impurity content of lead ≤ 0.05ppm, manganese ≤ 50ppm, iron ≤ 50ppm, there is no calcium carbonate residue, the taste is delicate, and the application performance in cheese products is better.

[0053] Example 1

[0054] After drying activated alumina at 120°C for 2h, it is impregnated with phosphoric acid solution in equal volume. After the impregnation is completed, it is left standing for 9h, then dried at 110°C for 7h, and then calcined in a muffle furnace at 500°C for 4h to obtain activated alumina supported phosphoric acid catalyst.

[0055] By mass, 38 parts of sodium carbonate are added to 550 parts of water, heated to 40°C, and after complete dissolution, 20 parts of calcium oxide are slowly added. After reacting at 80°C for 30min, it is filtered. The prepared calcium carbonate is washed with water at 78°C for 30min to dehydrate again. The dehydrated calcium carbonate is added to 500 parts of water, stirred evenly and heated to 80°C, 0.46 part of solid active carrier supported acid catalyst is added, and 27.5 parts of phosphoric acid aqueous solution (mass percentage concentration is 85%) are slowly added dropwise. After the dropwise addition is completed, the reaction is continued to be kept warm for 30min, and then filtered. The solution is concentrated until the product precipitates, then cooled to room temperature, filtered, dried at 120°C for 12h, and then the tricalcium phosphate product is ground to a particle size of 5.8 microns by using supersonic airflow equipment. The yield of the prepared product is 96.8%, the purity is 99.9%, among which lead is 0.03ppm, manganese is 32.67ppm, and iron is 21.42ppm. There are no bubbles generated in 2% citric acid solution. When added to cheese products, it has good formability, a smooth surface, and a delicate taste.

[0056] Comparative Example 1 (changing the form of calcium carbonate raw material)

[0057] By mass fraction, 36 parts of 600-mesh calcium carbonate are added to 550 parts of water, and the temperature is raised to 80 °C. Then, 0.48 part of a solid active carrier-supported acid catalyst is added, and 27.5 parts of a phosphoric acid aqueous solution (mass percentage concentration: 85%) are slowly added dropwise. After the addition is complete, the reaction is continued under insulation for 30 min. Then, filtration is carried out. The solution is concentrated until the product precipitates, then cooled to room temperature, filtered, dried at 120 °C for 12 h, and the tricalcium phosphate product is pulverized to a particle size of 6.2 microns using a supersonic air flow device.

[0058] Comparative Example 2 (changing the form of calcium carbonate raw material)

[0059] By mass fraction, 36 parts of 1250-mesh calcium carbonate are added to 550 parts of water, and the temperature is raised to 80 °C. Then, 0.48 part of a solid active carrier-supported acid catalyst is added, and 27.5 parts of a phosphoric acid aqueous solution (mass percentage concentration: 85%) are slowly added dropwise. After the addition is complete, the reaction is continued under insulation for 30 min. Then, filtration is carried out. The solution is concentrated until the product precipitates, then cooled to room temperature, filtered, dried at 120 °C for 12 h, and the tricalcium phosphate product is pulverized to a particle size of 5.9 microns using a supersonic air flow device.

[0060] Table 1 Influence of different raw material forms on the product

[0061]

[0062] Comparing Table 1, it can be seen that directly using calcium carbonate results in insufficient reaction, low product yield, high impurity ions, and a large amount of calcium carbonate residue, with a large number of bubbles appearing, seriously affecting the sensory properties during the application of the final product.

[0063] Comparative Example 3 (without using a catalyst)

[0064] By mass fraction, 38 parts of sodium carbonate are added to 550 parts of water, and the temperature is raised to 40 °C. After complete dissolution, 20 parts of calcium oxide are slowly added, and the temperature is raised to 78 °C for reaction for 30 min, then filtered. The obtained calcium carbonate is washed with water at 79 °C for 30 min for dehydration again. The dehydrated calcium carbonate is added to 500 parts of water, stirred evenly, the temperature is raised to 79 °C, and 27.5 parts of a phosphoric acid aqueous solution (mass percentage concentration: 85%) are slowly added dropwise. After the addition is complete, the reaction is continued under insulation for 30 min. Then, filtration is carried out. The solution is concentrated until the product precipitates, then cooled to room temperature, filtered, dried at 120 °C for 12 h, and the tricalcium phosphate product is pulverized to a particle size of 5.7 microns using a supersonic air flow device.

[0065] Table 2 Influence of not using a catalyst on the product

[0066]

[0067] As can be seen from Comparative Table 2, without using a catalyst, the reaction degree is low, the product yield decreases, there is calcium carbonate residue, which affects the sensory experience during the application of the final product.

[0068] Comparative Example 4 (changing the particle size of the product)

[0069] By mass parts, 38 parts of sodium carbonate were added to 550 parts of water, and the temperature was raised to 40 °C. After complete dissolution, 20 parts of calcium oxide were slowly added. After raising the temperature to 78 °C and reacting for 30 min, filtration was carried out. The prepared calcium carbonate was washed with water at 80 °C for 30 min for dehydration again. The dehydrated calcium carbonate was added to 500 parts of water, stirred evenly and the temperature was raised to 77 °C. 0.46 part of a solid active carrier-supported acid catalyst was added, and 27.5 parts of a phosphoric acid aqueous solution (mass percentage concentration of 85%) was slowly added dropwise. After the addition was completed, the reaction was continued under insulation for 30 min. Then filtration was carried out. The solution was concentrated until the product precipitated, then cooled to room temperature, filtered, and dried at 120 °C for 12 h. The product was pulverized and passed through a 100-mesh sieve, and the particle size was 49.6 microns.

[0070] Comparative Example 5 (changing the particle size of the product)

[0071] By mass parts, 38 parts of sodium carbonate were added to 550 parts of water, and the temperature was raised to 40 °C. After complete dissolution, 20 parts of calcium oxide were slowly added. After raising the temperature to 76 °C and reacting for 30 min, filtration was carried out. The prepared calcium carbonate was washed with water at 78 °C for 30 min for dehydration again. The dehydrated calcium carbonate was added to 500 parts of water, stirred evenly and the temperature was raised to 80 °C. 0.46 part of a solid active carrier-supported acid catalyst was added, and 27.5 parts of a phosphoric acid aqueous solution (mass percentage concentration of 85%) was slowly added dropwise. After the addition was completed, the reaction was continued under insulation for 30 min. Then filtration was carried out. The solution was concentrated until the product precipitated, then cooled to room temperature, filtered, and dried at 120 °C for 12 h. Then the calcium phosphate product was pulverized to a particle size of 18.5 microns using a supersonic airflow device.

[0072] Table 3 Influence of different particle sizes on the product

[0073]

[0074] As can be seen from Comparative Table 3, if the particle size of the product is relatively coarse, it will affect the taste during the application of the final product, and mottling will appear on the surface. The finer the particle size, the more delicate the taste.

[0075] Example 2

[0076] The activated alumina was dried at 120 °C for 2 h, then impregnated with a phosphoric acid solution in an equal volume. After impregnation, it was left standing for 9 h, then placed in an oven at 110 °C for drying for 6 h, and then calcined in a muffle furnace at 550 °C for 4 h to obtain an activated alumina-supported phosphoric acid catalyst.

[0077] By mass fraction, 38 parts of sodium carbonate are added to 550 parts of water, and the temperature is raised to 45 °C. After complete dissolution, 20.6 parts of calcium oxide are slowly added. After raising the temperature to 75 °C and reacting for 30 min, filtration is carried out. The prepared calcium carbonate is washed with water at 78 °C for 30 min for dehydration again. The dehydrated calcium carbonate is added to 500 parts of water, stirred evenly and the temperature is raised to 80 °C. 0.45 part of a solid active carrier-supported acid catalyst is added, and 28 parts of a phosphoric acid aqueous solution (mass percentage concentration is 85%) are slowly added dropwise. After the addition is completed, the reaction is continued under insulation for 30 min, and then filtration is carried out. The solution is concentrated until the product precipitates, then cooled to room temperature, filtered, dried at 120 °C for 12 h, and then the tricalcium phosphate product is pulverized to a particle size of 5.4 microns using a supersonic gas flow device. The yield of the prepared product is 97.2%, the purity is 99.9%, the lead content is 0.02 ppm, the manganese content is 33.17 ppm, and the iron content is 19.85 ppm. No bubbles are generated in a 2% citric acid solution. When added to cheese products, it has good formability, a smooth surface, and a delicate taste.

[0078] Example 3

[0079] The activated alumina is dried at 120 °C for 2 h, then impregnated with an equal volume of phosphoric acid solution. After impregnation is completed, it is left standing for 9 h, then dried at 110 °C for 6 h, and then calcined in a muffle furnace at 550 °C for 4 h to obtain an activated alumina-supported phosphoric acid catalyst.

[0080] By mass fraction, 38 parts of sodium carbonate are added to 500 parts of water, and the temperature is raised to 45 °C. After complete dissolution, 20.3 parts of calcium oxide are slowly added. After raising the temperature to 80 °C and reacting for 30 min, filtration is carried out. The prepared calcium carbonate is washed with water at 76 °C for 30 min for dehydration again. The dehydrated calcium carbonate is added to 500 parts of water, stirred evenly and the temperature is raised to 79 °C. 0.50 part of a solid active carrier-supported acid catalyst is added, and 27.4 parts of a phosphoric acid aqueous solution (mass percentage concentration is 85%) are slowly added dropwise. After the addition is completed, the reaction is continued under insulation for 30 min, and then filtration is carried out. The solution is concentrated until the product precipitates, then cooled to room temperature, filtered, dried at 130 °C for 12 h, and then the tricalcium phosphate product is pulverized to a particle size of 5.7 microns using a supersonic gas flow device. The yield of the prepared product is 97.3%, the purity is 99.9%, the lead content is 0.01 ppm, the manganese content is 31.25 ppm, and the iron content is 18.92 ppm. No bubbles are generated in a 2% citric acid solution. When added to cheese products, it has good formability, a smooth surface, and a delicate taste.

[0081] Example 4

[0082] The activated alumina is dried at 120 °C for 2 h, then impregnated with an equal volume of phosphoric acid solution. After impregnation is completed, it is left standing for 10 h, then dried at 110 °C for 6 h, and then calcined in a muffle furnace at 450 °C for 5 h to obtain an activated alumina-supported phosphoric acid catalyst.

[0083] By mass parts, 38 parts of sodium carbonate are added to 550 parts of water, and the temperature is raised to 45 °C. After complete dissolution, 21 parts of calcium oxide are slowly added. After raising the temperature to 78 °C and reacting for 30 min, filtration is carried out. The obtained calcium carbonate is washed with water at 76 °C for 30 min for dehydration again. The dehydrated calcium carbonate is added to 500 parts of water, stirred evenly and the temperature is raised to 80 °C. 0.40 part of a solid active carrier-supported acid catalyst is added, and 27.8 parts of a phosphoric acid aqueous solution (mass percentage concentration is 85%) are slowly added dropwise. After the addition is completed, the reaction is continued to be kept warm for 30 min, and then filtration is carried out. The solution is concentrated until the product precipitates, then cooled to room temperature, filtered, dried at 130 °C for 12 h, and then the tricalcium phosphate product is pulverized to a particle size of 6.1 microns by using a supersonic gas flow device. The yield of the obtained product is 96.9%, the purity is 99.9%, the lead content is 0.02 ppm, the manganese content is 28.74 ppm, and the iron content is 22.03 ppm. No bubbles are generated in a 2% citric acid solution. When added to cheese products, it has good formability, a smooth surface, and a delicate taste.

[0084] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A method for preparing tricalcium phosphate for cheese, characterized in that: The following steps are involved: S1. Take a carbonate source and a calcium source and react them in water to obtain a calcium carbonate slurry; S2. The calcium carbonate slurry and phosphoric acid are mixed and reacted, and a solid active carrier-supported acid catalyst is added to obtain tricalcium phosphate; S3. ultrafinely pulverize the obtained tricalcium phosphate to obtain a tricalcium phosphate product.

2. The method for preparing tricalcium phosphate for cheese according to claim 1, characterized in that: The carbonate source in step S1 is selected from at least one of sodium carbonate and potassium carbonate; The calcium source is at least one of calcium oxide and calcium chloride.

3. The method for preparing tricalcium phosphate for cheese according to claim 1, characterized in that: Step S1: the reaction temperature is 70-80° C., and the reaction molar ratio of the carbonate source to the calcium source is (0.95-1.01):1; After the reaction, the solid and liquid are separated, the calcium carbonate is washed with water and then separated again, and then the calcium carbonate after the solid-liquid separation is added into water to obtain the calcium carbonate slurry; The mass percentage concentration of calcium carbonate in the calcium carbonate slurry is 5-10%.

4. The method for preparing tricalcium phosphate for cheese according to claim 1, characterized in that: The active carrier in step S2 is activated alumina.

5. The method for preparing tricalcium phosphate for cheese according to claim 1, characterized in that: The solid active carrier-supported acid catalyst in step S2 is prepared by the following method: After the active carrier is dried, it is impregnated with a phosphoric acid solution, left to stand for 8 to 10 hours, dried again, and then calcined at 400 to 600° C. for 3 to 5 hours.

6. The method for preparing tricalcium phosphate for cheese according to claim 5, characterized in that: The active carrier is dried at a temperature of 100 to 140°C for 1 to 3 hours; The second drying temperature is 100-120°C and the time is 6-7h; The amount of the phosphoric acid solution is 0.9 to 1.2 times the volume of the active carrier.

7. The method for preparing tricalcium phosphate for cheese according to claim 1, characterized in that: The reaction temperature in step S2 is 70-80° C., and the amount of the calcium carbonate and the phosphoric acid is in a molar ratio of (1.4-1.5):1; The amount of the solid active carrier-supported acid catalyst is 1-2% of the mass of the phosphoric acid.

8. The method for preparing tricalcium phosphate for cheese according to claim 7, characterized in that: Step S2 further comprises: First, the calcium carbonate slurry is heated to 70-80° C., the solid active carrier-supported acid catalyst is added, and then phosphoric acid is slowly added dropwise. After the addition is completed, the reaction is continued by keeping the temperature for 20-40 minutes, and then filtered. The solution is concentrated until tricalcium phosphate is precipitated, and then filtered to obtain the tricalcium phosphate.

9. The method for preparing tricalcium phosphate for cheese according to claim 1, characterized in that: In step S3, the ultrafine grinding is first dried at a temperature of 120 to 130° C. for a time of 10 to 14 hours.

10. The method for preparing tricalcium phosphate for cheese according to claim 1, characterized in that: The ultrafine grinding is performed until the average particle size of tricalcium phosphate is 5 to 7 μm.

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