TWI608868B - Method and system for separating substances - Google Patents

Description

Method and system for separating substances

The present invention relates to a method for separating a substance, and more particularly to a method for separating a specific gravity of a substance.

At present, powdery foods such as starch produced by various processes are inevitably contaminated with various impurities derived from food materials (for example, plant materials). The presence of these impurities will reduce the purity and whiteness of the product, which in turn affects the properties of the product. These impurities are currently separated by washing and sieving, but the method of cleaning and sieving must be repeated several times. The effective removal of impurities depends on the size of the mesh. If the sieve having a small sieve opening is selected for sieving, the impurities can be effectively removed to improve the purity, but the loss rate of the product is also increased. In terms of the current material separation method, it is not only time consuming, but also increases the product loss rate in order to achieve high purity of the product. How to separate impurities at the same time with high equipment cost has become an effort of the relevant food industry. The goal.

For the sake of the job, the Applicant, in view of the above-mentioned shortcomings in the prior art, was carefully designed and researched, and the spirit of perseverance was used to conceive the "separation method of matter" in this case. The following is a brief description of the case.

The present invention provides a system and method for separating impurities in a powdery product, which can utilize water having no pollution to the environment and products as a medium to separate powdery solids of different specific gravities The separation and cleaning are integrated in the same process, achieving significant time savings and increased efficiency. In addition, the systems and methods provided by the present invention do not substantially increase the rate of loss while increasing product purity.

One of the purposes of the present invention is to provide a system for separating an impurity from a mixture. The system includes a tank body, a liquid disposed in the tank body having a liquid level, and a liquid inlet and a liquid outlet disposed in the tank body. The trough body includes a trough bottom. The mixture is dispersed in the liquid. The liquid outlet is closer to the bottom of the tank than the liquid inlet. The system further includes a liquid circulation drive device coupled to the liquid inlet and the liquid outlet outside the tank, configured to continuously drive the liquid to be discharged from the liquid outlet at a predetermined flow rate, and then flow from the liquid inlet at the predetermined flow rate a tank body to form a circulating turbulent flow in the tank.

Another object of the present invention is to provide a method of separating a first substance and a second substance from a mixture. The method includes dispersing the mixture in a liquid, wherein the first substance and the second substance have different specific gravities; and causing the liquid to follow a long side of a rectangular trough at a predetermined flow rate of 15-45 liters/minute Circulating back and forth into a circulating turbulent flow and separating the first substance from the second substance after a cycle time.

A further object of the present invention is to provide a method of separating a first substance and a second substance from a mixture. The method comprises: providing a tank; dispersing the mixture in a liquid to form a dispersion, and placing the dispersion in the tank; and forming the dispersion in the tank at a predetermined flow rate The specific circulation turbulence reaches a specific cycle time to separate the first substance from the second substance.

11, 21, 31, 41‧‧‧

13, 23, 33, 43 ‧ ‧ liquid inlet

15, 25, 35, 45‧‧‧ liquid exports

17‧‧‧pipe

171, 172‧‧‧ valves

19‧‧‧Liquid circulation drive

H‧‧‧Predetermined height

Fig. 1 is a schematic view showing a substance separation system of a first embodiment of the present invention.

2A is a schematic view of a substance separation system of a second embodiment of the present invention.

Fig. 2B is a right side view of the substance separation system of the second embodiment of the present invention.

Fig. 3A is a schematic view showing a substance separation system of a third embodiment of the present invention.

Fig. 3B is a right side view of the substance separation system of the third embodiment of the present invention.

Fig. 4A is a schematic view showing a substance separation system of a fourth embodiment of the present invention.

Fig. 4B is a front elevational view of the substance separation system of the fourth embodiment of the present invention.

Fig. 5 is a flow chart showing a method of separating substances according to a fifth embodiment of the present invention.

Figure 6 is a flow chart showing a method of separating matter according to a sixth embodiment of the present invention.

The apparatus, system, and method of the present invention will be fully understood from the following description of the embodiments and can be made by those skilled in the art. However, the implementation of this case is not limited to the following examples.

As used herein, "specific gravity" means the ratio between the density of an object and the density of water (both densities are obtained by weighing in air). If the specific gravity of the object is greater than 1, it will sink in the water, and if it is less than 1, it can float on pure water.

Please refer to Fig. 1, which is a schematic view of a substance separation system according to a first embodiment of the present invention. As shown, the substance separation system of the present invention comprises a tank body 11, a liquid inlet 13 for injecting a liquid into the tank body 11, a liquid outlet port 15 for discharging the liquid out of the tank body 11, and outside the tank body 11. The liquid circulation drive unit 19 of the liquid inlet 13 and the liquid outlet 15 is connected through a line 17. The tank body 11 is a rectangular parallelepiped in this embodiment, but is not limited thereto. The size of the tank 11 depends on the amount of the substance to be separated, for example, 160 liters (L) or 500 liters of the tank, but not limited thereto. The material of the tank body 11 is determined according to the substance to be separated, and the material thereof can be metal, plastic, rubber, ceramic material, Polymer material or a combination thereof. The tank 11 is filled with a liquid of a predetermined height H, and a mixture to be separated (for example, a mixture of starch and impurities) is dispersed in the liquid. Preferably, if a 500 L rectangular tank 11 is used, 300 L of liquid can be used. The position of the liquid inlet 13 is preferably near the liquid level. More preferably, the liquid inlet 13 is located 5-10 cm above the liquid level or about 5-10 cm below the liquid level. The position of the liquid outlet 15 is preferably below the liquid level. In the present embodiment, the liquid inlet 13 and the liquid outlet 15 are respectively on both sides of the tank body 11, and the liquid outlet 15 is closer to the bottom of the tank body 11 than the liquid inlet 13. Preferably, the liquid outlet 15 is at the middle of the liquid level and the bottom of the tank (i.e., at a position of 1/2H). The liquid inlet 13 and the liquid outlet 15 can be in the form of a conduit separate from the tank 11 as shown in Fig. 1 so that the same set of conduits 17 and the liquid circulation drive 19 can be used for a plurality of identical or different sizes. The tank, thereby increasing the variability of the material separation system. Alternatively, the liquid inlet 13 and the liquid outlet 15 may be integrally formed with the tank body 11. The liquid circulation driving device 19 is configured to continuously drive the liquid to be discharged from the liquid outlet 15 at a predetermined flow rate, and then flow into the tank body 11 from the liquid inlet 13 at the same predetermined flow rate to form a circulating flow in the tank body 11 (indicated by an arrow in the figure) Liquid flow direction). The liquid circulation drive unit 19 can be any device that can cause a circulating flow of liquid, preferably a water pump. In the present embodiment, the liquid circulation driving device 19 drives the liquid in the tank body 11 to continuously flow from right to left. Valves 171, 172 and flow switches (not shown) may be provided in the line 17 connecting the liquid circulation drive unit 19. The valves 171, 172 and the flow switch may be connected to a control panel (not shown) for monitoring and control. The desired circulation flows.

Please refer to FIG. 2A, which is a schematic diagram of a substance separation system according to a second embodiment of the present invention. In order to simplify the drawing, the liquid circulation driving device of the second embodiment is not shown, and the same portions of the second embodiment as those of the first embodiment will not be described again. The second embodiment differs from the first embodiment in the position of the liquid inlet 23 and the liquid outlet 25. As shown, the liquid inlet of the second embodiment The port 23 and the liquid outlet 25 are on the same side of the trough 21, further on the same side wall of the rectangular trough 21 or in the vicinity of the same side wall. In the present embodiment, both the liquid inlet 23 and the liquid outlet 25 are adjacent to the right side wall of the tank 21. Figure 2B is a right side view of the material separation system of Figure 2A, from which it can be seen that the liquid inlet 23 and the liquid outlet 25 are respectively on the left and right sides of the right side wall, wherein the liquid outlet 25 is closer to the bottom of the tank body 21 Close to the liquid level is the liquid inlet 23. The liquid inlet 23 can also be placed above the liquid level. In the present embodiment, the liquid circulation driving means drives the liquid in the tank body 21 to continue to flow from right to left and from left to right (the direction of the liquid flow is indicated by an arrow in the figure).

Please refer to FIG. 3A, which is a schematic diagram of a substance separation system according to a third embodiment of the present invention. In order to simplify the drawing, the liquid circulation driving device of the third embodiment is not shown, and the same portions of the third embodiment as those of the first embodiment will not be described again. The third embodiment differs from the first embodiment in the position of the liquid inlet 33 and the liquid outlet 35. As shown, the liquid inlet 33 and the liquid outlet 35 of the third embodiment are on the same side of the tank body 31, and further, on the same side wall of the rectangular tank body 31 or in the vicinity of the same side wall. In the present embodiment, both the liquid inlet 33 and the liquid outlet 35 are adjacent to the right side wall of the tank 31. Fig. 3B is a right side view of Fig. 3A, from which it can be seen that the liquid inlet 33 and the liquid outlet 35 are both close to the left side of the right side wall, wherein the liquid outlet 35 is closer to the bottom of the tank body 31, and the liquid is closer to the liquid surface. Entrance 33. The liquid inlet 33 can also be placed above the liquid level. In the present embodiment, the liquid circulation driving means drives the liquid in the tank body 31 to continue to flow from right to left and from left to right (the liquid flow direction is indicated by an arrow in the figure).

Please refer to FIG. 4A, which is a schematic diagram of a substance separation system according to a fourth embodiment of the present invention. In order to simplify the drawing, the liquid circulation driving device of the fourth embodiment is not shown, and the same portions of the fourth embodiment as those of the first embodiment will not be described again. The fourth embodiment differs from the first embodiment in the shape of the trough 41 and the positions of the liquid inlet 43 and the liquid outlet 45. As shown in the figure, the fourth real The trough 41 of the embodiment is generally conical but has a flat bottom. The liquid inlet 43 and the liquid outlet 45 of the fourth embodiment are similar to the second embodiment, both on the same side of the tank 41. In the present embodiment, both the liquid inlet 43 and the liquid outlet 45 are close to the right side of the tank 41. 4B is a front view of FIG. 4A, in which it can be seen that both the liquid inlet 43 and the liquid outlet 45 are close to the right side wall, wherein the liquid outlet 45 is closer to the bottom of the tank 41, and the liquid inlet 43 is closer to the liquid surface. . The liquid inlet 43 can also be placed above the liquid level.

Please refer to FIG. 5, which is a flow chart of a method for separating substances according to a fifth embodiment of the present invention. The method of the fifth embodiment is directed to separating the first substance and the second substance from a mixture comprising the first substance and the second substance. First, in step 51, a tank body is provided, which tank body can have a housing space of a rectangular parallelepiped, a cylinder or a cone. Preferably, the tank body has a liquid inlet and a liquid outlet as defined by the material separation system of any of the first to fourth embodiments. Next, a mixture comprising the first substance and the second substance is dispersed in a liquid to form a dispersion, and the dispersion is placed in the tank (step 52). The dispersion can be placed into the tank from the upper opening of the tank or directly into the tank from the liquid inlet. Alternatively, the mixture may be placed in the tank first, and then the liquid (from the upper opening of the tank or the liquid outlet) is injected into the tank to form a dispersion. Finally, the dispersion is caused to form a specific cyclic turbulence in the tank at a predetermined flow rate for a specific cycle time to separate the first substance from the second substance (step 53). The separation described in the step 53 may be at least one of the following: (1) the first substance and the second substance are precipitated in layers; (2) the first substance is precipitated, the second substance is dispersed in the liquid; and (3) The two substances precipitate and the first substance is dispersed in the liquid. When the separation described in the step 53 is (2) or (3), if the precipitater is the target product, the liquid can be drained (for example, by mercury in water) to obtain a final product. The aforementioned predetermined flow rate is in the range of 15 to 45 liters/minute, preferably 25 to 35 liters/minute, more preferably 25 liters/minute. The aforementioned specific cycle time is 1 to 4 hours In the range.

Please refer to FIG. 6, which is a flow chart of a method for separating substances according to a sixth embodiment of the present invention. First, in step 61, a mixture comprising a first substance and a second substance is dispersed in a liquid, wherein the first substance and the second substance have different specific gravities. Next, in step 62, the liquid is circulated back and forth along the long side of the rectangular trough to a circulating turbulent flow at a predetermined flow rate of 15-45 liters/minute, and the first substance is separated from the second substance after the cycle time. The separation described in step 62 may be at least one of the following: (1) stratified precipitation of the first substance and the second substance; (2) precipitation of the first substance, dispersion of the second substance in the liquid; and (3) The two substances precipitate and the first substance is dispersed in the liquid. The aforementioned predetermined flow rate is preferably 25-35 liters/minute, more preferably 25 liters/minute. The aforementioned cycle time is in the range of 1 to 4 hours. Preferably, the method of the present embodiment is accomplished using the system of the second or third embodiment of the present invention.

In various embodiments of the present invention, the choice of liquid medium depends primarily on the density (or specific gravity) of the first substance and the second substance to be separated in order to effectively separate the two substances. Secondly, consideration should be given to the ease of recycling and reuse, the wide range of sources, the low price, the non-polluting substances to be separated, and food safety. The liquid is preferably water, and other liquids (for example, an aqueous solution of a salt which can be used as a food additive, such as a calcium chloride solution) can also be used.

In each of the embodiments of the present invention, the first substance and the second substance must have different specific gravities, and the target product is insoluble in the liquid. Under the influence of gravity, the higher density particles move downward (settling) relative to the liquid density; conversely, the lower density particles move upward (upward). When the particles are placed in a liquid with a lower density, a vertical downward acceleration motion is applied until the frictional resistance of the liquid cancels out the settling driving force of the particles. Thereafter, the particles continue to settle at a constant speed (terminal speed). The density of the first substance and the second substance to be separated may both be greater than the density of the liquid; or Is one greater than the liquid density and one less than the liquid density. Preferably, the first substance and the second substance to be separated are both solids, and the density is one greater than the liquid density and one less than the liquid density. In various embodiments of the invention, the liquid is preferably water, the first material being greater than the liquid density and the second material being less than the liquid density, preferably having a specific gravity greater than one. The water moves in a certain manner in the tank body, and the material to be separated is subjected to the buoyancy and hydrodynamic action of the water to achieve stratified precipitation by specific gravity difference or only one of them is precipitated. In the case where only one of the substances to be separated is precipitated, it is preferred that the target product precipitates. The first material is preferably a vegetable starch having an average particle size of from about 40 to about 700 microns and a specific gravity greater than the second substance. The second substance is preferably an impurity produced during the extraction of the plant starch, which comprises plant fiber, protein, pectin and the like. The composition of the impurities may vary greatly depending on the extraction process, so the specific gravity may be greater than water or less than water, and some impurities (such as if the glue) will dissolve in water. Larger impurities can be filtered out in a preferred starch process, whereby starch and impurities can be isolated after separation of the starch and impurities in various embodiments of the present invention. However, even if large impurities (e.g., fibers) are present, the use of the embodiments of the present invention can effectively precipitate the starch and impurities in layers to achieve the separation effect. In summary, the first substance precipitates during the circulation of the water stream, and the second substance is suspended or precipitated on the first substance.

In the embodiments of the present invention, the water flow is not required to be absolutely parallel and stable, but rather a slight upward push-up force is required, which is equivalent to the sinking force of the lighter-weight solid, and enables the lighter-weight solid. It has been suspended in the liquid or sinked later than the heavier specific gravity.

The following describes an example performed using the various embodiments described above.

Example 1-3

Examples 1-3 use the substance separation systems of the first embodiment, the second embodiment, and the third embodiment, respectively, in order to clearly distinguish the separation effect, the first substance and the second substance to be separated Do not use starch and rice husk, the tank is a 500 liter rectangular tank containing 300 liters of water, and the material to be separated is suspended in water. The water in the tank was circulated for a period of 2 hours using mercury in water at a flow rate of 25 liters per minute. Since the specific gravity of the rice husk is greater than that of the starch, the rice husk precipitates during the circulation of the water, and the starch precipitates on the rice husk. The separation effect of Examples 1-3 is evaluated by dividing the bottom of the tank into a plurality of blocks (for example, 20 blocks), and evaluating the stratification of the first substance and the second substance in each block, And according to the degree of stratification (V), (△) and (X), wherein V indicates that the first substance and the second substance are completely layered; Δ indicates that the first substance and the second substance are substantially layered; X represents the first The substance and the second substance are slightly mixed.

Tables 1-3 show the separation effect evaluation of Examples 1-3, respectively. Substituting the first substance and the second substance in Examples 1-3 with white porcelain clay and yellow soil can obtain substantially the same evaluation results.

As apparent from the above Tables 1-3, the separation effect of Example 2 is preferred in Examples 1-3. That is, in the substance separation systems of the first to third embodiments, the substance of the second embodiment It is better to leave the system.

The replacement of the first substance and the second substance in Examples 1-3 with the starch and the impurities generated in the process of extracting the starch also achieves the best separation effect using the substance separation system of the second embodiment.

Example 4-8

Examples 4-8 all use the material separation system of the second embodiment. In order to clearly distinguish the separation effect, the first substance and the second substance to be separated are respectively made of starch and rice husk, and the tank body is a rectangular tank of 500 liters, and the tank body It contains 300 liters of water, and the substance to be separated is suspended in water. The water in the tank was caused to circulate for a period of 2 hours using water mercury at the flow rates shown in Table 4. The second substance precipitates during the circulation of the water stream, and the first substance precipitates on the second substance.

As can be seen from Table 4, 25 liters/min is the best flow rate. When the flow rate is lower than 25 liters/min, finer impurities are easily precipitated together with the starch, and the separation effect is not good. When the flow rate is greater than 25 liters/min, the separation effect is good, but the faster flow rate tends to cause the precipitated starch to rise again. The water flow is lost, so the amount of starch loss is large. The optimum flow rate will vary with the geometry of the material to be separated, the liquid and the container, but there will be an optimal flow point. The separation effect is less than the optimal flow point, and the separation is better than the optimal flow point. Big.

When the first substance and the second substance in Examples 4-8 were replaced with starch and soybean ferment, respectively, results similar to those shown in Table 4 were obtained. When the first and second materials in Examples 4-8 were replaced with starch and the impurities produced during the extraction of the starch, an optimum flow rate of 25 liters/min was also obtained.

Examples 9 and 10

Examples 9 and 10 all use the material separation system of the fourth embodiment, wherein both the liquid inlet and the liquid outlet are on the same side of the tank. In order to clearly identify the separation effect, the first substance and the second substance to be separated are respectively made of starch and rice husk. The tank is a 500 liter drum containing 300 liters of water while the material to be separated is suspended in the water. In Example 9, water mercury was used to cause the water in the tank to be substantially spirally cycled for a period of 3 hours at a flow rate of 25 liters per minute. In Example 10, water mercury was used to cause the tank at a flow rate of 25 liters/minute. The water in the line is roughly cycled back and forth for up to 3 hours of cycle time. The second substance precipitates during the circulation of the water stream, and the first substance precipitates on the second substance. In Example 9, the first substance and the second substance are clearly layered only at the annular edge of the bottom of the drum, and the center of the bottom of the drum exhibits uneven separation. In Example 10, the first substance and the second substance are clearly separated on the side away from the liquid inlet and the liquid outlet, and are mixed together on the side close to the liquid inlet and the liquid outlet. Thus, Example 9 and Example 10 are not preferred embodiments as compared to other examples and embodiments. In order to exert a better material separation effect, the tank body is preferably a rectangular tank body having a certain depth.

Example 11-14

Examples 11-14 all use the substance separation system of the second embodiment, wherein the first substance and the second substance to be separated are respectively starch and impurities generated during the process of extracting starch, and the tank body is a 500-liter rectangular tank, the tank The body contains 300 liters of water, and the substance to be separated is suspended in water. Using water mercury at a flow rate of 25 liters per minute caused water circulation in the tank to reach the cycle time shown in Table 5. The total weight of the first substance and the second substance to be separated is 7 kg. The first substance precipitates during the circulation of the water stream and the second substance is suspended in the water.

As can be seen from Table 5, at a flow rate of 25 liters/minute, a water flow cycle time of 2 to 4 hours is preferred. It will be appreciated by those skilled in the art that a water flow cycle time of more than 4 hours is also feasible, however, it is desirable to save a process time for mass production of the plant, and a water flow cycle time of 2 to 4 hours is preferred.

The substance separation system of the various embodiments of the present invention is particularly suitable for separating two substances having very close specific gravity or two solid substances having very small particles. It is assumed below that the first substance to be separated (for example, starch) has an average particle diameter of 40 to 700 μm and a specific gravity larger than that of the second substance (for example, impurities). When the solid particles settle in the liquid, the sedimentation velocity will increase gradually due to the acceleration of gravity. However, when the velocity is as high as a certain degree, the gravity, buoyancy and resistance will reach equilibrium, and the sedimentation velocity will not change at this time. For terminal velocity. Object in fluid Settling velocity is related to particle size, object density, fluid density, fluid viscosity (at low speed), gravity (or centrifugal force). The substance separation system according to the present invention produces a liquid phase flow on the separation faces of the two kinds of particles. When both particles are precipitated, the liquid phase flow on the separation surface brings up the two kinds of particles, of which heavy particles or weight. The particles smaller than the area (the first substance) are less and more precipitated, whereas the second substance is less likely to be precipitated, whereby the first substance and the second substance are precipitated or only sequentially. The first substance precipitates to cause a significant separation effect. The aforementioned liquid phase flow may be laminar or turbulent, preferably turbulent. When controlling the liquid phase flow rate or increasing some turbulent uplifting force, the second substance is just completely taken up, but the heavy particles or the particles with a smaller weight than the area (the first substance) are precipitated as much as possible; The sediment is piled up layer by layer to cause significant delamination. Accordingly, the present invention provides a continuous separation process that controls the stratified precipitation of only two of the materials to be separated or only one of them by passing a continuous flow of liquid through a flow rate adjustment or selection of a liquid of a particular specific gravity.

As can be seen from the above embodiments, the present invention does not require special customized equipment, and the present invention can use non-polluting water as a medium, thereby reducing the cost of production and ensuring the safety of operators. According to the material separation system and method of the present invention, two solid materials having similar specific gravity can be separated and simultaneously cleaned through a system with a relatively simple overall structure and low equipment cost, which can achieve a significant saving in process time and efficiency. The product after separation has been synchronized through the cleaning process, which is quite helpful for subsequent further processing. The system and method provided by the present invention are particularly useful for separating impurities (especially impurities in food powders) in powdered products, and without increasing the purity of the product, without significantly increasing the rate of wear. Thus, the systems and methods of the present invention are quite competitive for the food industry.

Other embodiments

A system for separating an impurity from a mixture, comprising: a tank body comprising a tank bottom; a liquid having a liquid level disposed in the tank body, the mixture being dispersed in the liquid; being disposed in the tank body a liquid inlet and a liquid outlet, wherein the liquid outlet is closer to the bottom of the tank than the liquid inlet; and a liquid circulation drive unit connecting the liquid inlet and the liquid outlet outside the tank, configured to continue The liquid is driven to be discharged from the liquid outlet at a predetermined flow rate, and then flows into the tank at the predetermined flow rate from the liquid inlet to form a circulating turbulent flow in the tank.

2. The system of embodiment 1, wherein the trough body has an accommodating space selected from the group consisting of a rectangular parallelepiped, a cylinder, and a cone.

3. The system of any of the preceding embodiments, wherein the liquid inlet is 5-10 cm below the liquid level, and the liquid outlet is intermediate the liquid level and the bottom of the tank.

4. The system of any of the preceding embodiments, wherein the liquid inlet and the liquid outlet are on opposite sides of the tank.

5. The system of any of the preceding embodiments, wherein the liquid inlet and the liquid outlet are on the same side of the tank and the predetermined flow rate is 25 liters/minute.

6. The system of any of the preceding embodiments, wherein the liquid inlet and the liquid outlet are disposed on an identical sidewall of the tank, and the predetermined flow rate is in a range of 15-45 liters/minute.

7. A method of separating a first substance and a second substance from a mixture, comprising: dispersing the mixture in a liquid, wherein the first substance and the second substance have different specific gravities; and 15-45 A predetermined flow rate of liters per minute causes the liquid to circulate back and forth along a long side of a rectangular trough The cycle is turbulent and the first substance is separated from the second substance after a cycle time.

8. A method of separating a first substance and a second substance from a mixture comprising: providing a tank; dispersing the mixture in a liquid to form a dispersion, and placing the dispersion in the tank And separating the first substance from the second substance by forming a specific circulation turbulence in the tank at a predetermined flow rate for a specific cycle time.

9. The method of any of the preceding embodiments, wherein: the first substance has an average particle size of 40 to 700 microns, the first substance has a specific gravity less than a majority of the specific gravity of the second substance, the first The separation of the substance from the second substance comprises at least one of: the first substance is precipitated and the second substance is in the dispersion; and the first substance and the second substance are precipitated in layers.

10. The method of any of the preceding embodiments, wherein the cycle time is in a range of 1 to 4 hours, and the tank has a liquid inlet and a liquid outlet, wherein the liquid inlet is compared to the liquid inlet The liquid outlet is closer to a bottom of the tank.

The method of any of the preceding embodiments, wherein the first substance is starch and the second substance is an impurity obtained during starch extraction.

The method of any of the preceding embodiments, wherein the impurities comprise fibers, proteins, and pectin.

The method or system of any of the preceding embodiments, wherein the liquid inlet is 5-10 cm on the liquid surface.

The above embodiments are merely illustrative of exemplary embodiments of the present invention, but the present invention The scope of the invention is not limited to the specific embodiments described above; and the invention may be modified by those skilled in the art without departing from the scope of the application.

11‧‧‧

13‧‧‧Liquid inlet

15‧‧‧Liquid exports

17‧‧‧pipe

171, 172‧‧‧ valves

19‧‧‧Liquid circulation drive

H‧‧‧Predetermined height

Claims (9)

A system for separating an impurity from a mixture, comprising: a tank body comprising a tank bottom; a liquid having a liquid level disposed in the tank body, the mixture being dispersed in the liquid; being disposed in the tank body a liquid inlet and a liquid outlet, wherein the liquid outlet is closer to the bottom of the tank than the liquid inlet, and the liquid inlet is 5-10 cm below the liquid surface, and the liquid outlet is at the liquid level a middle portion of the bottom of the tank; and a liquid circulation driving device connected to the liquid inlet and the liquid outlet outside the tank, configured to continuously drive the liquid to be discharged from the liquid outlet at a predetermined flow rate, and then from the liquid inlet A predetermined flow rate flows into the tank to form a circulating turbulent flow in the tank. The system of claim 1, wherein the tank has an accommodating space selected from the group consisting of a rectangular parallelepiped, a cylinder, and a cone. The system of claim 1, wherein the liquid inlet and the liquid outlet are on opposite sides of the tank. The system of claim 1, wherein the liquid inlet and the liquid outlet are on the same side of the tank, and the predetermined flow rate is 25 liters/minute. The system of claim 1, wherein the liquid inlet and the liquid outlet are disposed on a same side wall of the tank, and the predetermined flow rate is in a range of 15-45 liters/minute. A method for separating a first substance and a second substance from a mixture, comprising: dispersing the mixture in a liquid, wherein the first substance and the second substance have different specific gravities; and the liquid is 15- A predetermined flow rate of 45 liters/minute flows into a rectangular trough, wherein the rectangle The trough body includes a trough bottom, a liquid inlet and a liquid outlet, and the liquid has a liquid level in the rectangular trough, the liquid inlet is 5-10 cm below the liquid surface, and the liquid outlet is in the At the middle of the liquid level and the bottom of the tank, the liquid is circulated back and forth along a long side of the rectangular tank to form a cyclic turbulent flow, and the first substance is separated from the second substance after a cycle time. A method for separating a first substance and a second substance from a mixture, comprising: providing a tank body, wherein the tank body comprises a tank bottom, a liquid inlet, and a liquid outlet; and dispersing the mixture in a liquid Forming a dispersion, and placing the dispersion in the tank, wherein the dispersion has a liquid level in the tank, the liquid inlet is 5-10 cm below the liquid surface, and the liquid An outlet is intermediate the liquid level and the bottom of the tank; and the dispersion is caused to form a specific cyclic turbulence in the tank at a predetermined flow rate for a specific cycle time to separate the first substance from the second substance. The method of claim 7, wherein: the first substance has an average particle diameter of 40 to 700 microns, and the separation of the first substance from the second substance comprises at least one of: the first The substance precipitates and the second substance is in the dispersion; and the first substance and the second substance are precipitated in layers. The method of claim 7, wherein the cycle time is in a range of 1 to 4 hours, and the tank has a liquid inlet for allowing a liquid to enter the tank and allowing the liquid to leave the tank a liquid outlet, wherein the liquid outlet is closer to a bottom of the tank than the liquid inlet.