Method and device for continuous flocculation and sedimentation of a jerusalem artichoke extract by phosphoric acid

Abstract

The present application belongs to the field of deep processing technology of Jerusalem artichoke, and discloses a method and device for continuous flocculation and sedimentation of Jerusalem artichoke extract liquid by phosphoric acid method, which solves the problems of complex equipment, large amount of filter mud and low product yield in clarifying Jerusalem artichoke extract liquid by lime milk-carbonate method. In the present application, the Jerusalem artichoke extract liquid in the extraction section is sent into a mixed juice tank for temporary storage, and then pumped into a lime mixing tank to mix and react with calcium oxide clarification solution. Then, the mixture is overflowed into a phosphorus mixing tank to mix and react with phosphoric acid solution. After that, the mixture is overflowed into a strengthening reactor to stay and react, and then enters a neutralization juice tank for temporary storage. The mixture is heated to a specified temperature by a heater, enters a diffuser tank to release water vapor, and then automatically flows into a rapid sedimentation device to mix and settle with a flocculant solution. The clear liquid is filtered by a curved screen and then enters a clear juice tank, and the sediment is treated by a vacuum suction filter to obtain recovered filter juice and adsorbed filter mud. The recovered filter juice is returned to the mixed juice tank, and the adsorbed filter mud is temporarily stored. The present application has the advantages of simplified process, high product yield and purity.

Description

Technical Field

[0001] This invention belongs to the field of Jerusalem artichoke deep processing technology, and particularly relates to a method and apparatus for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method. Background Technology

[0002] Jerusalem artichoke, also known as sunchoke, has tubers rich in inulin. Inulin, a natural water-soluble dietary fiber, has various physiological functions, including regulating intestinal flora, lowering blood sugar, and lowering blood lipids, and is widely used in food, medicine, and health products. In the deep processing of Jerusalem artichoke, the clarification of the extract (sugar juice) is one of the key steps. Its purpose is to remove suspended impurities, proteins, pectin, pigments, and other harmful substances from the extract to obtain a pure, clear juice, thereby improving the yield and purity of subsequent products.

[0003] Currently, the clarification process for Jerusalem artichoke extract mainly employs the lime milk-carbonation method. This process requires secondary CO2 injection and secondary filtration, making it complex and requiring significant equipment investment. Furthermore, it generates a large amount of filter mud (0.8-1.2 tons / ton of inulin), whose main component is calcium carbonate, which cannot be recycled. This not only increases the cost of filter mud disposal but also causes significant environmental pollution. In addition, the lime milk-carbonation method has a long production cycle and high energy consumption, resulting in high production costs. Moreover, the inulin yield is low (only 73.2%), and the purity of the finished product needs improvement, making it difficult to meet the needs of large-scale industrial production and the requirements of green and environmentally friendly development.

[0004] Therefore, developing a method for clarifying Jerusalem artichoke extract that is simple in process, requires little equipment investment, consumes little energy, is environmentally friendly, and can improve product yield and purity has become an urgent technical problem to be solved in the field of Jerusalem artichoke deep processing. Summary of the Invention

[0005] One objective of this invention is to provide a method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid, which effectively solves the problems of complex equipment, high energy consumption, large amount of filter mud, high environmental pressure, and low product yield in the existing lime milk-carbonation method for clarifying Jerusalem artichoke extract.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid, comprising the following steps: S1, selecting the raw sugar juice from the Jerusalem artichoke extraction section as the Jerusalem artichoke extract; S2, dissolving calcium oxide powder in water at 60-70℃ to prepare a calcium oxide solution with a mass fraction of 10-12%, allowing it to stand and clarify, adding the clarified liquid to the Jerusalem artichoke extract at 80℃, controlling the pH value of the Jerusalem artichoke extract to be maintained between 10.5-11, mixing and reacting fully to obtain solution A; S3, preparing a 10% phosphoric acid solution with water using industrial-grade colorless transparent phosphoric acid with a purity of not less than 85%, adding the phosphoric acid solution to solution A at 75℃, controlling the pH value of solution A to be maintained between 6.5-6.8, mixing and reacting fully to obtain solution B, the amount of phosphoric acid solution added being controlled at 300-500 g / L. S4. Prepare a flocculant solution with anionic polyacrylamide in water, with a mass fraction of 0.05-0.075%. Heat solution B to 95-104℃, and then add the flocculant solution to the heated solution B to obtain solution C. The amount of flocculant solution added is such that the final mass concentration of flocculant in solution C is 5-8 ppm. S5. Send solution C to a rapid settling tank for separation and sedimentation. After sedimentation for 45-50 minutes, the clear liquid is discharged from the upper part of the rapid settling tank. The discharged clear liquid is filtered through a curved screen to obtain pure clear juice with a transparency of 55-60%. The pure clear juice is sent to the clear juice tank for subsequent product preparation. The sediment at the bottom of the rapid settling tank is intermittently discharged to a vacuum filter. After filtration, it is divided into recovered filtrate and adsorbed filter mud. The recovered filtrate is sent to step S1 for reuse, and the adsorbed filter mud is recycled as fertilizer raw material.

[0007] Furthermore, in step S2, the CaO content in the calcium oxide powder is ≥92%.

[0008] Furthermore, in step S4, the degree of hydrolysis of the anionic polyacrylamide is 22-28%, and the molecular weight is ≥18 million.

[0009] Furthermore, in step S4, solution B is heated to 98-102°C.

[0010] Furthermore, in step S3, the phosphoric acid solution is directly added after preparation without additional purification.

[0011] Furthermore, in step S5, the main components of the adsorption filter mud are calcium phosphate and hydroxyapatite, and it also contains a small amount of protein pectin, plant residue and adsorption impurities; the effective P2O5 content of the adsorption filter mud after air drying is 9%.

[0012] Furthermore, in step S1, the sugar concentration of the Jerusalem artichoke extract is 14-15°Bx, and the temperature is 75-80℃, to remove obvious mechanical impurities from the Jerusalem artichoke extract.

[0013] Furthermore, in step S5, the discharged clear liquid is filtered through a 100-mesh curved sieve.

[0014] Another objective of this invention is to provide an apparatus for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method. The apparatus employs the method described in the above embodiments for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method, and includes a mixing tank, an ash-adding mixing tank, a phosphorus-adding mixing tank, an enhanced reactor, a neutralizing tank, a heater, a gas dispersing tank, a rapid sedimentation device, a curved screen, a clearing tank, and a vacuum filter.

[0015] Jerusalem artichoke extract in the mixing tank is pumped to the ash mixing tank and mixed with the calcium oxide clarification solution. It then overflows to the phosphorus mixing tank and mixes with the phosphoric acid solution. After overflowing to the enhanced reactor for further reaction, it enters the neutralization tank for temporary storage. It is then heated to a specified temperature by a heater and enters the aeration tank to release water vapor. It then automatically flows into the rapid settling tank and mixes with the flocculant solution for sedimentation. The clear liquid obtained after sedimentation is filtered through a curved screen and enters the clear liquid tank. The sediment obtained after sedimentation is processed by a vacuum filter to obtain the recovered filtrate and adsorbed filter mud. The recovered filtrate is returned to the mixing tank, and the adsorbed filter mud is sent for temporary storage.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are: (1) Simplified process and less equipment investment: The present invention adopts the method of adding all auxiliary materials at one time, without the need for secondary CO2 filling and secondary filtration, and the process flow is simple; the required equipment structure is simple, and compared with the lime milk-carbonation method, the equipment investment is greatly reduced, which reduces the initial investment cost of enterprises.

[0017] (2) Low energy consumption and low production cost: The process flow of this invention is short and the heating load of the extract is low. The power consumption per ton of finished product is only 1120kWh and the steam consumption is only 5.4t. Compared with the lime milk-carbonation method (power consumption per ton of finished product is 1530kWh and steam consumption is 7.2t), the energy consumption is significantly reduced. At the same time, the cost of filter mud disposal is only 12 yuan / t of inulin, which is much lower than the 146 yuan / t of inulin in the lime milk-carbonation method. The comprehensive production cost per ton of inulin is reduced by 1047 yuan, which greatly improves the economic benefits of enterprises.

[0018] (3) High product yield and purity: The yield of inulin of the present invention can reach 82.5%, which is 9.3 percentage points less than the 73.2% of the lime milk-carbonation method; the purity of the finished product can reach 92.3%. The present invention has low calcium residue and fewer impurities, resulting in better product quality and better meeting market demand.

[0019] (4) Environmentally friendly and highly sustainable: The amount of filter mud produced by this invention is only 0.25-0.4 tons / ton of inulin, which is only 1 / 3 of that of the lime milk-carbonation method; the main component of the filter mud is calcium phosphate (Ca3(PO4)2), which can be recycled as a raw material for phosphate fertilizer. After air drying, the effective P2O5 content is 9%. 1 ton of ordinary calcium phosphate is equivalent to 1.78 tons of air-dried filter mud, realizing the resource utilization of filter mud, greatly reducing environmental pressure, conforming to the green and sustainable development concept advocated by the state, and avoiding the problems of filter mud not being able to be recycled and polluting the environment in the existing process.

[0020] (5) Achieve continuous production: The entire process of this invention can achieve automatic control of adding auxiliary materials and continuous sedimentation separation, resulting in high production efficiency and suitability for large-scale industrial production. This solves the defects of existing processes, such as long production cycles and inability to produce continuously. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection structure of the apparatus for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to the present invention.

[0022] Explanation of reference numerals in the attached diagrams: Mixing juice tank-1; Ash mixing tank-2; Phosphorus mixing tank-3; Enhanced reactor-4; Neutralizing juice tank-5; Pipeline heater-6; Gas dissipation tank-7; Rapid settling device-8; Curved screen-9; Clearing juice tank-10; Vacuum filter-11; Belt conveyor-12. Detailed Implementation

[0023] Example 1: A device for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method, such as... Figure 1 As shown, it includes a mixing tank 1, an ash mixing tank 2, a phosphorus mixing tank 3, an enhanced reactor 4, a neutralizing tank 5, a pipeline heater 6, a gas dissipation tank 7, a rapid settling device 8, a curved screen 9, a clearing tank 10, and a vacuum filter 11.

[0024] Jerusalem artichoke extract in mixing tank 1 is pumped to ash mixing tank 2 and mixed with calcium oxide clarification solution for reaction; then it overflows to phosphorus mixing tank 3 and mixed with phosphoric acid solution for reaction; then it overflows to enhanced reactor 4 and stays for reaction for about 10 minutes before entering neutralization tank 5 for temporary storage; then it is heated to a specified temperature by pipeline heater 6 and enters diffuser 7 to release water vapor; then it automatically flows into rapid settling tank 8, where the added flocculant mixes with the sugar juice at the inlet of rapid settling tank 8, and is separated and settled through complex intervals inside the equipment; the clear liquid obtained after settling is filtered through curved screen 9 and enters clear juice tank 10; the sediment obtained after settling is processed by vacuum filter 11 to obtain recovered filtrate and adsorbed filter mud; the recovered filtrate is returned to mixing tank 1, and the adsorbed filter mud is sent to the stockpile for temporary storage by belt conveyor 12.

[0025] Example 2: This example provides a method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid, applied to the apparatus described in Example 1, and includes the following steps: S1. Raw material pretreatment: The sugar juice from the Jerusalem artichoke extraction section was selected as the Jerusalem artichoke extract. After testing, the sugar juice concentration was 14.5°Bx, the temperature was 78℃, and there were no large mechanical impurities. It was directly used for subsequent processing.

[0026] S2. Addition of calcium oxide solution: Select calcium oxide powder with a CaO content of 92%, dissolve the calcium oxide powder in water at 65℃, and continuously stir to prepare a calcium oxide solution with a mass fraction of 11%. After standing and clarifying, take the clarified liquid and add it to Jerusalem artichoke extract at 80℃. Adjust the amount of clarified liquid added through the automatic control system to maintain the pH value of Jerusalem artichoke extract at 10.8. Mix for 2.5 minutes to obtain solution A, ensuring a complete reaction.

[0027] S3. Adding phosphoric acid solution: Prepare a 10% phosphoric acid solution by mixing 85% pure industrial-grade colorless and transparent phosphoric acid with water. Add the phosphoric acid solution to solution A at 75℃. The amount of phosphoric acid solution added is controlled at 400 ppm. Adjust the amount of phosphoric acid solution added through the automatic control system to maintain the pH value of solution A at 6.5. Mix for 2.5 minutes to obtain solution B.

[0028] S4. Flocculant addition: Anionic polyacrylamide is selected as the flocculant, with a degree of hydrolysis of 25% and a molecular weight of 18 million. The anionic polyacrylamide is prepared into a flocculant solution with a mass fraction of 0.06% by water. Solution B is heated to 100°C, and then the flocculant solution is added to the heated solution B to obtain solution C. The amount of flocculant solution added is to make the final mass concentration of flocculant in solution C 6 ppm. An automatic control method is used to ensure uniform dispersion of flocculant.

[0029] S5. Continuous sedimentation separation: Solution C is sent to a rapid sedimentation tank for separation and sedimentation. After sedimentation for 48 minutes, the clear liquid is discharged from the upper part of the rapid sedimentation tank. The discharged clear liquid is filtered through a 100-mesh curved sieve to remove a small amount of suspended impurities and foam, and a pure clear juice with a transparency of 58% is obtained. The pure clear juice is sent to the clear juice tank for subsequent inulin preparation.

[0030] The sediment (i.e. filter mud) at the bottom of the rapid settling tank is intermittently discharged to the vacuum filter press. After filtration, it is divided into recovered filtrate and adsorbed filter mud. The recovered filtrate is sent to step S1 for reuse. The adsorbed filter mud is unloaded by a scraper and transported to an outdoor storage yard for temporary storage. It is then sent to an organic fertilizer plant for recycling as fertilizer raw material.

[0031] According to statistics, in this embodiment, the yield of inulin is 82.5%, the purity of the finished product is 92.3%, the lime consumption is 43 kg per ton of finished product, the power consumption is 1120 kWh, the steam consumption is 5.4 t, the wet filter mud production is 0.31 t / t of inulin, the filter mud disposal cost is 12 yuan / t of inulin, the comprehensive production cost per ton of inulin is 19,500 yuan, and the annual profit (calculated based on 5,000 tons / year of inulin) is 6.12 million yuan. After the adsorbed filter mud is air-dried, the effective P2O5 content is 9% (average), which can be recycled as a raw material for phosphate fertilizer, realizing resource utilization.

[0032] The adsorption filter mud produced in this embodiment consists mainly of calcium phosphate, with small amounts of protein, pectin, fine plant residue, and adsorption impurities. The composition of the air-dried adsorption filter mud is as follows: 58% calcium phosphate (Ca3(PO4)2) and hydroxyapatite, 22% plant organic matter (protein, pectin, microfiber), 9% bound water / water of crystallization, 7% inorganic impurities such as calcium, magnesium, and silicon, and 4% pigments and trace adsorption impurities. The effective P2O5 content of the air-dried adsorption filter mud is 9% (average), while the effective P2O5 content of commercially available agricultural calcium phosphate (extracalcium phosphate) is 16% (average). The equivalent ratio is: 1 ton of extracalcium phosphate ≈ 1.78 tons of air-dried adsorption filter mud.

[0033] Example 3: This example provides a method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid, applied to the apparatus described in Example 1, and includes the following steps: S1. Raw material pretreatment: The sugar juice from the Jerusalem artichoke extraction section is selected as the Jerusalem artichoke extract. After testing, the concentration of the sugar juice is 14°Bx and the temperature is 75°C. After removing a small amount of larger mechanical impurities, it is used for subsequent processing.

[0034] S2. Addition of calcium oxide solution: Select calcium oxide powder with a CaO content of 93%, dissolve the calcium oxide powder in water at 65℃, and continuously stir to prepare a calcium oxide solution with a mass fraction of 10%. After standing and clarifying, take the clarified liquid and add it to Jerusalem artichoke extract at 80℃. Adjust the amount of clarified liquid added through the automatic control system to maintain the pH value of Jerusalem artichoke extract at 10.5. Mix for 2 minutes to obtain solution A, ensuring a complete reaction.

[0035] S3. Adding phosphoric acid solution: Prepare a 10% phosphoric acid solution by mixing 86% pure industrial-grade colorless and transparent phosphoric acid with water. Add the phosphoric acid solution to solution A at 75℃. The amount of phosphoric acid solution added is controlled at 300 ppm. Adjust the amount of phosphoric acid solution added through the automatic control system to maintain the pH value of solution A at 6.5. Mix for 2 minutes to obtain solution B.

[0036] S4. Flocculant addition: Anionic polyacrylamide is selected as the flocculant, with a degree of hydrolysis of 22% and a molecular weight of 19 million. The anionic polyacrylamide is prepared into a flocculant solution with a mass fraction of 0.05% by water. Solution B is heated to 95°C, and then the flocculant solution is added to the heated solution B to obtain solution C. The amount of flocculant solution added is to make the final mass concentration of flocculant in solution C 5 ppm. An automatic control method is used to ensure uniform dispersion of flocculant.

[0037] S5. Continuous sedimentation separation: Solution C is sent to a rapid sedimentation tank for separation and sedimentation. After sedimentation for 45 minutes, the clear liquid is discharged from the upper part of the rapid sedimentation tank. The discharged clear liquid is filtered through a 100-mesh curved sieve to remove a small amount of suspended impurities and foam, and a pure clear juice with a transparency of 55% is obtained. The pure clear juice is sent to the clear juice tank for subsequent inulin preparation.

[0038] The sediment (i.e. filter mud) at the bottom of the rapid settling tank is intermittently discharged to the vacuum filter press. After filtration, it is divided into recovered filtrate and adsorbed filter mud. The recovered filtrate is sent to step S1 for reuse. The adsorbed filter mud is unloaded by a scraper and transported to an outdoor storage yard for temporary storage. It is then sent to an organic fertilizer plant for recycling as fertilizer raw material.

[0039] According to statistics, in this embodiment, the yield of inulin is 82.1%, the purity of the finished product is 92.0%, the lime consumption is 42.8 kg per ton of finished product, the power consumption is 1115 kWh, the steam consumption is 5.3 t, the wet filter mud production is 0.30 t / t of inulin, the filter mud disposal cost is 12 yuan / t of inulin, and the comprehensive production cost per ton of inulin is 19520 yuan. The adsorbed filter mud can be normally recycled as a raw material for phosphate fertilizer.

[0040] Example 4: This example provides a method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid, applied to the apparatus described in Example 1, and includes the following steps: S1. Raw material pretreatment: The sugar juice from the Jerusalem artichoke extraction section is selected as the Jerusalem artichoke extract. After testing, the sugar juice concentration is 15°Bx, the temperature is 80℃, and there are no large mechanical impurities. It can be directly used for subsequent processing.

[0041] S2. Addition of calcium oxide solution: Select calcium oxide powder with a CaO content of 94%, dissolve the calcium oxide powder in water at 70℃, and continuously stir to prepare a calcium oxide solution with a mass fraction of 11%. After standing and clarifying, take the clarified liquid and add it to Jerusalem artichoke extract at 80℃. Adjust the amount of clarified liquid added through the automatic control system to maintain the pH value of Jerusalem artichoke extract at 11.0. Mix for 3 minutes to obtain solution A, ensuring a complete reaction.

[0042] S3. Adding phosphoric acid solution: Prepare a 10% phosphoric acid solution by mixing 87% pure industrial-grade colorless and transparent phosphoric acid with water. Add the phosphoric acid solution to solution A at 75℃. The amount of phosphoric acid solution added is controlled at 400 ppm. Adjust the amount of phosphoric acid solution added through the automatic control system to maintain the pH value of solution A at 6.8. Mix for 3 minutes to obtain solution B.

[0043] S4. Flocculant addition: Anionic polyacrylamide is selected as the flocculant, with a degree of hydrolysis of 28% and a molecular weight of 20 million. The anionic polyacrylamide is prepared into a flocculant solution with a mass fraction of 0.075% by water. Solution B is heated to 104℃, and then the flocculant solution is added to the heated solution B to obtain solution C. The amount of flocculant solution added is to make the final mass concentration of flocculant in solution C 8ppm. An automatic control method is used to ensure uniform dispersion of flocculant.

[0044] S5. Continuous sedimentation separation: Solution C is sent to a rapid sedimentation tank for separation and sedimentation. After sedimentation for 50 minutes, the clear liquid is discharged from the upper part of the rapid sedimentation tank. The discharged clear liquid is filtered through a 100-mesh curved sieve to remove a small amount of suspended impurities and foam, and a pure clear juice with a transparency of 60% is obtained. The pure clear juice is sent to the clear juice tank for subsequent inulin preparation.

[0045] The sediment (i.e. filter mud) at the bottom of the rapid settling tank is intermittently discharged to the vacuum filter press. After filtration, it is divided into recovered filtrate and adsorbed filter mud. The recovered filtrate is sent to step S1 for reuse. The adsorbed filter mud is unloaded by a scraper and transported to an outdoor storage yard for temporary storage. It is then sent to an organic fertilizer plant for recycling as fertilizer raw material.

[0046] According to statistics, in this embodiment, the yield of inulin is 82.8%, the purity of the finished product is 92.5%, the lime consumption is 43.2 kg per ton of finished product, the power consumption is 1125 kWh, the steam consumption is 5.5 t, the wet filter mud production is 0.32 t / t of inulin, the filter mud disposal cost is 12 yuan / t of inulin, and the comprehensive production cost per ton of inulin is 19480 yuan. The filter mud can be normally recycled as a raw material for phosphate fertilizer.

[0047] Test Example 1: The continuous flocculation and sedimentation method of Jerusalem artichoke extract using phosphoric acid as described in Example 2 (hereinafter referred to as "lime milk-phosphoric acid sedimentation method") was compared with the existing membrane separation method (ultrafiltration). The results are shown in Table 1.

[0048] Table 1. Statistical comparison of lime slurry-phosphoric acid sedimentation method and membrane separation method across different dimensions As shown in Table 1, the lime milk-phosphoric acid sedimentation method provided in Example 2 has the following advantages: (1) Impurity removal capability: crushing ultrafiltration: targeting protein, pectin, and pigment macromolecule colloids, it removes them deeply in one go, with high clarity, solving the problems of inulin raw material loss and subsequent color return. (2) No risk of material blockage, suitable for crude raw material: no need for precision filtration pretreatment, directly treats high turbidity crude extract. (3) Extremely low industrialization cost: simple equipment, no high-end consumables, no high electricity costs, and low overall operating cost of the production line. (4) High raw material tolerance: suitable for saline-alkali land, inferior, high ash Jerusalem artichoke raw materials, not affected by seasonal fluctuations in raw materials, and has high production stability. (5) Solid waste can be recycled: the filter mud is calcium phosphate organic fertilizer raw material, there is no difficult-to-treat organic wastewater, and the environmental pressure is small.

[0049] Test Example 2: The continuous flocculation and sedimentation method of Jerusalem artichoke extract using phosphoric acid as described in Example 2 (hereinafter referred to as "lime milk-phosphoric acid sedimentation method") was compared with the existing lime milk-carbonic acid method in terms of equipment, process and production operation data. The results are shown in Tables 2 and 3.

[0050] Table 2. Comparison of equipment and processes between lime slurry-phosphoric acid sedimentation method and lime slurry-carbonic acid method. Table 3 Comparison of actual operating data between lime slurry-phosphoric acid sedimentation method and lime slurry-carbonic acid method (5000 tons / year inulin production) Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid, characterized in that, Includes the following steps: S1. Select the sugar juice from the Jerusalem artichoke extraction section as the Jerusalem artichoke extract; S2. Dissolve calcium oxide powder in water at 60-70℃ to prepare a calcium oxide solution with a mass fraction of 10-12%. After standing and clarifying, take the clarified liquid and add it to Jerusalem artichoke extract at 80℃. Control the pH value of Jerusalem artichoke extract to be maintained between 10.5 and 11. Mix and react fully to obtain solution A. S3. Prepare a 10% phosphoric acid solution by mixing industrial-grade colorless and transparent phosphoric acid with a purity of not less than 85% with water. Add the phosphoric acid solution to solution A at 75℃, and control the pH value of solution A to be maintained between 6.5 and 6.

8. Mix and react fully to obtain solution B. The amount of phosphoric acid solution added is controlled at 300-500 ppm. S4. Prepare anionic polyacrylamide into a flocculant solution with a mass fraction of 0.05-0.075% using water. Heat solution B to 95-104℃, and then add the flocculant solution to the heated solution B to obtain solution C. The amount of flocculant solution added is such that the final mass concentration of flocculant in solution C is 5-8 ppm. S5. Solution C is sent to a rapid settling tank for separation and sedimentation. After sedimentation for 45-50 minutes, the clear liquid is discharged from the upper part of the rapid settling tank. The discharged clear liquid is filtered through a curved sieve to obtain pure clear juice with a transparency of 55-60%. The pure clear juice is sent to the clear juice tank for subsequent product preparation. The sediment at the bottom of the rapid settling device is intermittently discharged to the vacuum filter. After filtration, it is divided into recovered filtrate and adsorbed filter mud. The recovered filtrate is sent to step S1 for reuse, and the adsorbed filter mud is recycled as fertilizer raw material.

2. The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to claim 1, characterized in that, In step S2, the CaO content in the calcium oxide powder is ≥92%.

3. The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to claim 1, characterized in that, In step S4, the degree of hydrolysis of the anionic polyacrylamide is 22-28%, and the molecular weight is ≥18 million.

4. The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to claim 1, characterized in that, In step S4, solution B is heated to 98-102℃.

5. The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to claim 1, characterized in that, In step S3, the phosphoric acid solution is prepared and used directly for addition without additional purification.

6. The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to claim 1, characterized in that, In step S5, the main components of the adsorption filter mud are calcium phosphate and hydroxyapatite, and it also contains a small amount of protein pectin, plant residue and adsorption impurities; the effective P2O5 content of the adsorption filter mud after air drying is 9%.

7. The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to claim 1, characterized in that, In step S1, the sugar concentration of the Jerusalem artichoke extract is 14-15°Bx, and the temperature is 75-80℃, to remove obvious mechanical impurities from the Jerusalem artichoke extract.

8. The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to claim 1, characterized in that, In step S5, the discharged clear liquid is filtered through a 100-mesh curved sieve.

9. A device for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method, characterized in that, The method for continuous flocculation and sedimentation of Jerusalem artichoke extract using phosphoric acid method according to any one of claims 1-8 includes a mixing tank, an ash-adding mixing tank, a phosphorus-adding mixing tank, an enhanced reactor, a neutralizing tank, a heater, a gas dispersing tank, a rapid sedimentation device, a curved screen, a clearing tank, and a vacuum filter. Jerusalem artichoke extract in the mixing tank is pumped to the ash mixing tank and mixed with the calcium oxide clarification solution. It then overflows to the phosphorus mixing tank and mixes with the phosphoric acid solution. After overflowing to the enhanced reactor for further reaction, it enters the neutralization tank for temporary storage. It is then heated to a specified temperature by a heater and enters the aeration tank to release water vapor. It then automatically flows into the rapid settling tank and mixes with the flocculant solution for sedimentation. The clear liquid obtained after sedimentation is filtered through a curved screen and enters the clear liquid tank. The sediment obtained after sedimentation is processed by a vacuum filter to obtain the recovered filtrate and adsorbed filter mud. The recovered filtrate is returned to the mixing tank, and the adsorbed filter mud is sent for temporary storage.

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