A method for extracting cassava starch

Abstract

This invention discloses a low-cost, high-efficiency cassava starch extraction method in the field of starch preparation technology, comprising the following steps: Step 1, raw material processing: After washing and peeling the cassava, soak it in clean water for 1 to 2 hours; Step 2, placing the soaked cassava into a processing device, where a rolling roller circulates and presses the cassava. The squeezing action of the crushing blocks and the cooperating blocks on the rolling roller separates the starch from the cassava residue. The rolling roller, through the force between the crushing blocks and the cooperating blocks, drives the rotating blocks and the drum to rotate. The cassava residue falls from the slag outlet onto the waste plate, and the slurry is discharged into a sedimentation tank after double filtration by the drum and the filter screen; Step 3, separating the starch from the slurry using a starch hydrocyclone, and then dehydrating, drying, and packaging the separated starch for storage; By maintaining the integrity of the fiber in the cassava residue, it is easier to separate the cassava residue from the starch slurry in the future, thus improving work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of starch preparation, and particularly relates to a cassava starch extraction method. BACKGROUND

[0002] Cassava starch is a powder obtained by dehydrating and drying cassava after starch extraction. Cassava starch has two categories of native starch and various modified starches, and is widely used in food industry and non-food industry.

[0003] The traditional cassava starch extraction process includes cassava crushing, pulp residue separation, washing separation and dehydration drying steps. In the cassava crushing, the cassava is cut into small pieces. If the cassava crushing is not sufficient, it is not conducive to the separation of starch and pulp residue. If the cassava crushing is too sufficient, it will increase the difficulty of separation of starch and small fibers in the slurry in the subsequent pulp residue separation. In the pulp residue separation process, the pulp residue after the cassava crushing is separated in the vertical centrifugal screen. The pulp residue is gradually accumulated on the surface of the screen to form a thick pulp residue and starch mixed filter layer, so that the resistance of the starch slurry passing through the screen is increased. Since the fibers in the pulp residue are uneven materials, if the smallest fiber is used as the screen diameter for screening, the starch is not easy to pass through the pulp residue and starch mixed filter layer, or if the screen diameter is too large, the starch slurry contains small fiber impurities, which increases the filtering step and reduces the work efficiency. Therefore, the present application provides a cassava starch extraction method. SUMMARY

[0004] The purpose of the present application is to provide a cassava starch extraction method, which maintains the integrity of the fibers in the pulp residue, facilitates the subsequent separation of the pulp residue and the starch slurry, and improves the work efficiency.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A cassava starch extraction method, comprising the following steps: step one, raw material treatment, after the cassava is cleaned and peeled, it is soaked in clean water for 1 to 2 hours;

[0007] Step two, the soaked cassava is put into the feed inlet of the processing device, the processing device includes a mounting frame, the mounting frame is provided with a processing tank, the processing tank is provided with a first processing cavity and a second processing cavity from left to right, a roller is rotatably connected in the first processing cavity, a plurality of openings are formed in the roller, the first processing cavity is also connected with a residue outlet and a slurry outlet, the slurry outlet is located below the roller, a filter screen is connected with the slurry outlet, and the residue outlet is located on both sides of the roller; a sedimentation tank is arranged below the slurry outlet, the sedimentation tank is connected with a water return pipe, one end of the water return pipe away from the sedimentation tank is connected with the first processing cavity and the second processing cavity respectively; the residue outlet is also fixedly connected with an inclined waste board, and the waste board is located above the sedimentation tank;

[0008] The side of the roller close to the second processing cavity is coaxially connected with an arc-shaped rotating block, the rotating block is located in the second processing cavity and is in sliding fit with the second processing cavity, a plurality of matching blocks are fixedly connected to the inner wall of the rotating block;

[0009] The second processing cavity is also provided with a crushing roller, a plurality of crushing blocks are fixedly connected to the crushing roller, and the crushing blocks are located on one side of the crushing pipe and abut against the matching blocks; one end of the crushing roller is in rotary fit with the mounting frame, the other end of the crushing roller penetrates through the second processing cavity, and the other end of the crushing roller is coaxially connected with a driving member, the driving member is located on one side of the second processing cavity and is fixedly connected with the mounting frame; the second processing cavity is also connected with a feeding port, and the feeding port is located above the crushing roller;

[0010] The upper clear liquid on the surface of the sedimentation tank is pumped into the first processing cavity and the second processing cavity through the backwater pipe, the cassava is subjected to cyclic pressure by the crushing roller, and the residue and the slurry are obtained, and the crushing blocks on the crushing roller and the matching blocks are subjected to extrusion, so that the starch in the residue is separated from the residue, and the crushing roller drives the rotating block and the roller to rotate through the force between the crushing blocks and the matching blocks;

[0011] During the continuous rotation of the crushing roller, when the crushing blocks are no longer in abutment with the matching blocks, the rotating block falls to the bottom of the second processing cavity due to gravity, and the residue gradually moves into the first processing cavity;

[0012] During the rotation of the residue in the roller, when the residue outlet is in communication with the opening, the residue falls from the residue outlet to the waste board, and the slurry is filtered through the roller and the filter screen and discharged into the sedimentation tank;

[0013] Step three, heat the slurry in the sedimentation tank to 35 to 42 degrees, separate the starch in the slurry through the starch cyclone, and then dehydrate, dry and package the separated starch for storage.

[0014] The above scheme has the following beneficial effects:

[0015] During the processing of the cassava by the crushing roller, extrusion, grinding and transportation are realized, and the starch is separated from the residue.

[0016] The residue is driven to rotate by the rotating block and the matching block, and when the crushing blocks are no longer in abutment with the matching blocks, the residue moves into the first processing cavity, compared with the prior art, the use of the conveying belt is reduced, the resource utilization rate is improved, and the residue is rolled to realize the crushing of different positions of the residue, so that the starch in the residue is separated from the residue.

[0017] The potato residue is processed by the same direction of the crushing roller pair, so that the fibers in the obtained potato residue remain consistent in the same direction, the integrity of the fibers in the potato residue is maintained, the potato residue continuously rolls on the screen, the potato residue starch mixed filter layer is not easy to form, and the potato residue is automatically discharged from the residue outlet, automatic separation is realized, the probability of starch passing through the screen is increased, the fiber content in the subsequent obtained starch slurry is reduced, and the working efficiency is improved. Compared with the prior art, the separation steps in the slurry residue separation process are reduced, the energy use cost and the water consumption are reduced, and the cassava starch extraction is more efficient.

[0018] Further, the diameters of the broken pieces gradually decrease from left to right.

[0019] Beneficial effect: the diameter change of the broken pieces gradually reduces the distance between the crushing roller and the rotating block, facilitating the step-by-step crushing of cassava and the separation of starch and potato residue.

[0020] Further, the end of the mounting frame close to the second processing cavity is higher than the end of the mounting frame close to the first processing cavity.

[0021] Beneficial effect: the inclined mounting frame makes the first processing cavity and the second processing cavity inclined, facilitating the flow of slurry into the sedimentation tank and the movement of potato residue into the first processing cavity.

[0022] Further, in step three, the slurry in the sedimentation tank is subjected to PH detection, so that the PH value of the slurry is maintained between 6.5 and 7.5.

[0023] Beneficial effect: because the cassava starch slurry is acidic, too high or too low PH value can easily cause the change of starch precipitation speed, and maintaining the appropriate PH value facilitates the sedimentation of starch.

[0024] Further, in step two, water droplets are sprayed on the potato residue on the waste board, and the spraying direction is above the residue outlet.

[0025] Beneficial effect: the water droplet spraying method removes the unwashed starch on the surface of the potato residue, saves water consumption, and replenishes the water in the sedimentation tank to make up for the water loss due to evaporation and subsequent processing.

[0026] Further, in step one, cassava with uniform appearance diameter is selected as the raw material.

[0027] Beneficial effect: the uniform diameter of the cassava as the raw material maintains the uniformity of the fibers in the processed potato residue.

[0028] Further, in step two, the cassava is placed horizontally along the processing direction of the crushing roller.

[0029] Beneficial effects: It keeps the cassava processed in the same direction, preventing the fibers in the cassava residue from being broken down in large quantities during processing, reducing the content of small fibers in the pulp, and facilitating subsequent separation.

[0030] Furthermore, in step two, the return water pipe is located on the side of the sedimentation tank away from the slurry outlet, and the return water pipe is located below the second processing chamber.

[0031] Beneficial effects: Makes the obtained supernatant clearer and reduces the starch content in the rinse supernatant. Attached Figure Description

[0032] Figure 1 This is a front view of the processing apparatus for the cassava starch extraction method according to an embodiment of the present invention.

[0033] Figure 2 for Figure 1 A three-dimensional schematic diagram of the mounting bracket.

[0034] Figure 3 for Figure 1 A cross-sectional view of the rolling mill roller.

[0035] Figure 4 for Figure 1 A three-dimensional schematic diagram of the roller.

[0036] Figure 5 for Figure 4 A three-dimensional schematic diagram of the rotating block. Detailed Implementation

[0037] The following detailed description illustrates the specific implementation method:

[0038] The reference numerals in the accompanying drawings include: mounting frame 1, feed inlet 10, slag outlet 11, slurry outlet 12, roller 2, opening 21, mating block 22, rotating block 23, crushing roller 3, crushing block 31, motor 32, return water pipe 4, sedimentation tank 5, waste plate 6. Example 1

[0039] The basic implementation examples are as follows: Figures 1 to 5 The following is a method for extracting cassava starch, comprising the following steps: Step 1: Raw material processing. Select cassava with uniform diameter as raw material. After washing and peeling the cassava, soak it in clean water for 1 to 2 hours to allow the starch granules to swell, making it easier to separate the starch granules from the cassava residue, making it easier to remove impurities from the surface of the cassava, and removing the amylase in the cassava.

[0040] Step two, the soaked cassava is put into the feed inlet 10 of the processing device, the processing device includes a mounting frame 1, the mounting frame 1 is provided with a processing groove, the processing groove is sequentially provided with a first processing cavity and a second processing cavity from left to right, one end of the mounting frame 1 close to the second processing cavity is higher than the other end of the mounting frame 1 close to the first processing cavity;

[0041] The first processing cavity is rotatably connected with a roller 2, the roller 2 is provided with a plurality of openings 21, the first processing cavity is also connected with a slag outlet 11 and a slurry outlet 12, the slurry outlet 12 is located below the roller 2, the slurry outlet 12 is connected with a filter screen, the slag outlet 11 is located on both sides of the roller 2; a sedimentation tank 5 is arranged below the slurry outlet 12, the sedimentation tank 5 is connected with a water return pipe 4, one end of the water return pipe 4 away from the sedimentation tank 5 is connected with the first processing cavity and the second processing cavity respectively, the water return pipe 4 is located on the side of the sedimentation tank 5 away from the slurry outlet 12, and the water return pipe 4 is located below the second processing cavity; the slag outlet 11 is also fixedly connected with an inclined waste board 6, the waste board 6 is located above the sedimentation tank 5;

[0042] The roller 2 is coaxially connected with an arc-shaped rotating block 23 on the side close to the second processing cavity, the rotating block 23 is located in the second processing cavity, and the rotating block 23 is in sliding fit with the second processing cavity, a plurality of matching blocks 22 are fixedly connected to the inner wall of the rotating block 23;

[0043] The second processing cavity is also provided with a crushing roller 3, a plurality of crushing blocks 31 are fixedly connected to the crushing roller 3, and the crushing blocks 31 are located on one side of the crushing pipe, and the crushing blocks 31 abut against the matching blocks 22; one end of the crushing roller 3 is rotatably connected with the mounting frame 1, the other end of the crushing roller 3 penetrates through the second processing cavity, and the other end of the crushing roller 3 is coaxially connected with a driving member, the driving member is a motor 32, the driving member is located on one side of the second processing cavity, and the driving member is fixedly connected with the mounting frame 1; the second processing cavity is also connected with the feed inlet 10, and the feed inlet 10 is located above the crushing roller 3;

[0044] The crushing roller 3 processes the residue in the same direction, so that the fibers in the obtained residue maintain consistency in the same direction, and the integrity of the fibers in the residue is maintained.

[0045] The cassava is placed horizontally along the processing direction of the crushing roller 3, the upper layer of supernatant on the surface of the sedimentation tank 5 is pumped into the first processing cavity and the second processing cavity through the water return pipe 4, the cassava is cyclically pressed by the crushing roller 3, the residue and the slurry are obtained, and the crushing blocks 31 on the crushing roller 3 and the extrusion of the matching blocks 22 separate the starch in the residue from the residue, the crushing roller 3 drives the rotating block 23 and the roller 2 to rotate through the acting force between the crushing blocks 31 and the matching blocks 22;

[0046] In the process of continuously rotating the rolling roller 3, when the broken block 31 is no longer in contact with the matched block 22, the rotating block 23 falls to the bottom of the second processing cavity due to gravity, and the residue is continuously moved into the first processing cavity due to the dislocation force between the rotating block 23 and the rolling roller 3, and the inclined mounting frame 1 makes the residue continuously move into the first processing cavity due to gravity; in the process of processing cassava by the rolling roller 3, extrusion, grinding and transportation are realized, which facilitates the separation of starch and residue. Compared with the prior art, the use of conveying belts is reduced, the resource utilization rate is improved, and at the same time, the residue is rolled to realize the rolling of different positions of the residue, which facilitates the separation of starch in the residue and the residue.

[0047] In the process of rotating the residue in the drum 2, when the residue outlet 11 is communicated with the opening 21, the residue falls from the residue outlet 11 to the waste plate 6, and the slurry is filtered by the drum 2 and the filter screen and discharged into the sedimentation tank 5; the residue is continuously tumbled on the screen, and it is not easy to form a mixed filter layer of residue starch, and the residue is automatically discharged from the residue outlet 11, realizing automatic separation; the probability of starch passing through the screen is increased, and the fiber content in the subsequent obtained starch slurry is also reduced, thereby improving the working efficiency. Compared with the prior art, the separation steps in the slurry residue separation process are reduced, the energy use cost and the water consumption are reduced, and the cassava starch extraction is more efficient.

[0048] Step three, heat the slurry in the sedimentation tank 5 to 35-42 degrees, separate the starch in the slurry through the starch cyclone, then dehydrate, dry and pack the separated starch for storage. Example 2

[0049] The difference between the above embodiment and the present embodiment is that the diameter of the broken block 31 gradually decreases from left to right.

[0050] The specific implementation process is as follows: the diameter of the broken block 31 gradually decreases the distance between the rolling roller 3 and the rotating block 23, which facilitates the step-by-step crushing of cassava, increases the grinding accuracy of the broken block 31 and the residue, and facilitates the separation of starch and residue. Example 3

[0051] The difference between the above embodiment and the present embodiment is that in step three, the PH of the slurry in the sedimentation tank 5 is detected, and the PH of the slurry is kept between 6.5 and 7.5.

[0052] The specific implementation process is as follows: adjust the pH of the milk slurry to control the activity of microorganisms and fermentation, and accelerate the separation of starch and other impurities; too high or too low PH value is easy to cause the change of starch precipitation speed, and keeping the appropriate PH value facilitates the sedimentation of starch; the gum on the outer layer of the starch particles is removed, and the starch particles are kept white. Example 4

[0053] The difference from the above embodiment is that in step two, the water droplet is sprayed on the waste plate 6 using clean water, and the spraying direction is above the slag outlet 11.

[0054] The specific implementation process is as follows: the uncleaned starch on the surface of the potato residue is removed by water droplet spraying, water is saved, and the water in the sedimentation tank 5 is supplemented to make up for the water loss due to evaporation and subsequent processing.

[0055] The above is only an embodiment of the present application, and common knowledge such as specific structures and / or characteristics in the scheme is not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A cassava starch extraction method, characterized by, The method comprises the following steps: Step one, raw material processing, after washing and peeling the cassava, soak it in clean water for 1 to 2 hours; Step two, put the soaked cassava into the feeding port of the processing device, the processing device comprises a mounting frame, the mounting frame is provided with a processing groove, the processing groove is sequentially provided with a first processing cavity and a second processing cavity from left to right, the first processing cavity is rotatably provided with a roller, the roller is provided with a plurality of openings, the first processing cavity is further connected with a slag outlet and a slurry outlet, the slurry outlet is located below the roller, the slurry outlet is connected with a filter screen, and the slag outlet is located on both sides of the roller; a sedimentation tank is arranged below the slurry outlet, the sedimentation tank is connected with a backwater pipe, one end of the backwater pipe away from the sedimentation tank is connected with the first processing cavity and the second processing cavity respectively; the slag outlet is further fixedly connected with an inclined waste board, and the waste board is located above the sedimentation tank; The side of the roller close to the second processing cavity is coaxially connected with an arc-shaped rotating block, the rotating block is located in the second processing cavity and is in sliding fit with the second processing cavity, and a plurality of matching blocks are fixedly connected to the inner wall of the rotating block; The second processing cavity is further provided with a rolling roller, a plurality of crushing blocks are fixedly connected to the rolling roller, and the crushing blocks are located on one side of the rolling pipe, and the crushing blocks abut against the matching blocks; one end of the rolling roller is in rotational fit with the mounting frame, the other end of the rolling roller penetrates through the second processing cavity, and the other end of the rolling roller is coaxially connected with a driving member, the driving member is located on one side of the second processing cavity, and the driving member is fixedly connected with the mounting frame; the second processing cavity is further connected with a feeding port, and the feeding port is located above the rolling roller; The upper layer of supernatant on the surface of the sedimentation tank is pumped into the first processing cavity and the second processing cavity through the backwater pipe, the cassava is cyclically pressed by the rolling roller to obtain residue and slurry, and the crushing blocks on the rolling roller and the matching blocks are extruded to separate the starch in the residue from the residue; the rolling roller drives the rotating block and the roller to rotate through the force between the crushing blocks and the matching blocks; During the continuous rotation of the rolling roller, when the crushing blocks are no longer in abutment with the matching blocks, the rotating block falls to the bottom of the second processing cavity due to gravity, and the residue gradually moves into the first processing cavity; During the rotation of the residue in the roller, when the slag outlet is in communication with the opening, the residue falls from the slag outlet to the waste board, and the slurry is filtered by the roller and the filter screen and discharged into the sedimentation tank; Step three, heat the slurry in the sedimentation tank to 35 to 42 degrees, separate the starch in the slurry through a starch cyclone, and then dehydrate, dry and package the separated starch for storage.

2. The cassava starch extraction method according to claim 1, characterized by: The diameters of the crushing blocks gradually decrease from left to right.

3. The cassava starch extraction method according to claim 1, characterized by: The end of the mounting frame close to the second processing cavity is higher than the end of the mounting frame close to the first processing cavity.

4. The cassava starch extraction method according to claim 1, characterized by: In step three, the PH of the slurry in the sedimentation tank is detected to keep the PH of the slurry between 6.5 and 7.

5.

5. The cassava starch extraction method according to claim 1, characterized by: In step two, water droplets are sprayed on the residue on the waste board from above the slag outlet.

6. The cassava starch extraction method according to claim 1, characterized by: In step one, the cassava with the same diameter is selected as the raw material.

7. The cassava starch extraction method according to claim 1, characterized by: In step two, the cassava is placed horizontally along the processing direction of the rolling roller.

8. The cassava starch extraction method according to claim 1, characterized by: In step two, the backwater pipe is located at the side of the sedimentation tank far from the slurry outlet, and the backwater pipe is located below the second processing cavity.

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