Horizontal flotation cell and device for removing polyethylene film from pulp

Abstract

The utility model discloses a horizontal type flotation cell and paper pulp polyethylene film removal device relates to cotton rod raw material fiber preparation technical field, and the main purpose is to make the residual mulch polyethylene substance in paper pulp high -efficient sorting and go out, improves cotton rod pulp quality. The main technical scheme of the utility model is: horizontal type flotation cell, including: first material position mechanism includes first fixed plate and first lifting plate, and there is first interval between first fixed plate and the top wall of tank body, and first lifting plate is vertically slid with respect to first fixed plate, and pulp inlet pipe is connected in the top wall of right chamber, and one end of pulp outlet pipe is connected in the bottom wall of right chamber, and the other end of pulp outlet pipe is connected in the lower end one side of adjusting groove, and the lower end other side of adjusting groove is connected in the discharge pipe, and second material position mechanism includes second fixed plate and second lifting plate in the adjusting groove, and there is second interval between second fixed plate and the top wall of adjusting groove, and second lifting plate is vertically slid with respect to second fixed plate.

Description

Technical Field

[0001] This utility model relates to the field of cotton stalk raw material fiber preparation technology, and in particular to a horizontal flotation cell and a device for removing polyethylene film from pulp. Background Technology

[0002] Cotton mulch plays a vital role in agricultural production, improving the growing environment of cotton fields and enhancing cotton yield and quality. However, during cotton stalk harvesting, mulch film inevitably gets mixed into the raw cotton stalks, causing frequent blockages in pressure screens, disc mills, and pumps during pulping. In papermaking, it frequently results in issues like light penetration, bright spots, paper breaks, screen clogging, and felt clogging. This leads to discontinuous pulping, severe equipment wear, and unstable pulp quality. Furthermore, it causes frequent paper defects and poor waterproofing and oil-proofing during papermaking or molding, causing significant problems for cotton stalk pulp users.

[0003] The impact of residual plastic film has become a prominent problem restricting the large-scale development of cotton stalk pulping. Therefore, how to efficiently separate residual plastic film and other polyethylene substances from the pulp so that the cotton stalk pulp can be used in higher-grade fiber products has become an urgent problem for cotton stalk pulping enterprises to solve. Utility Model Content

[0004] In view of this, the present invention provides a horizontal flotation cell and a device for removing polyethylene film from pulp, the main purpose of which is to efficiently separate residual polyethylene film from the pulp and improve the quality of cotton stalk pulp.

[0005] To achieve the above objectives, this utility model mainly provides the following technical solutions:

[0006] On the one hand, this utility model embodiment provides a horizontal flotation cell, which includes: a cell body, a first material leveling mechanism, a slurry inlet pipe, a slurry outlet pipe, and a second material leveling mechanism;

[0007] The first material leveling mechanism includes a first fixed plate and a first lifting plate. There is a first gap between the first fixed plate and the top wall of the tank body, which is used to divide the tank body into a left chamber and a right chamber. The first lifting plate slides vertically relative to the first fixed plate to adjust the size of the first gap.

[0008] The slurry inlet pipe is connected to the top wall of the right chamber;

[0009] One end of the slurry outlet pipe is connected to the bottom wall of the right chamber, and the other end of the slurry outlet pipe is connected to one side of the lower end of the regulating trough. The other side of the lower end of the regulating trough is connected to the discharge pipe.

[0010] The second material level mechanism includes a second fixed plate and a second lifting plate disposed in the adjusting trough. There is a second gap between the second fixed plate and the top wall of the adjusting trough, which is used to separate the slurry outlet pipe and the discharge pipe. The second lifting plate slides vertically relative to the second fixed plate to adjust the size of the second gap.

[0011] The purpose of this utility model and the technical problems to be solved can be further achieved by the following technical measures.

[0012] Optionally, it also includes a bubble generator, wherein the slurry inlet pipe penetrates the top wall of the right chamber and is connected to the bubble generator.

[0013] Optionally, it also includes a slag discharge pipe and a dilution pipe, wherein the slag discharge pipe is connected to the bottom wall of the left chamber and the dilution pipe is connected to the top wall of the left chamber.

[0014] On the other hand, embodiments of this utility model also provide a device for removing polyethylene film from pulp, comprising: a pulp dilution tower, a rotary grid filter, a good pulp tank, and the aforementioned horizontal flotation tank;

[0015] The lower end of the dilution slurry tower is connected to one end of the slurry inlet pipe, and the other end of the slurry inlet pipe is connected to the top wall of the right chamber. One end of the slag discharge pipe is connected to the bottom wall of the left chamber, and the other end is connected to the feed inlet of the rotary grid filter. One end of the discharge pipe is connected to the other side of the lower end of the regulating tank, and the other end is connected to the good slurry tank.

[0016] Optionally, it also includes a flushing pipe, which is connected to the sidewall of the dilution pipe and the dilution slurry tower respectively.

[0017] Optionally, the drain pipe of the rotary bar filter is connected to the slurry tank.

[0018] By employing the above technical solution, this utility model has at least the following advantages:

[0019] Using this polyethylene film removal device for pulp, the removal rate of polyethylene substances such as mulch film in cotton stalk pulp reaches over 97%, meeting the conditions for applying cotton stalk pulp to higher-grade fiber products, thus making the rapid and large-scale development of cotton stalk pulping a reality. Attached Figure Description

[0020] Figure 1 A schematic diagram of a device for removing polyethylene film from pulp provided in an embodiment of this utility model;

[0021] Figure 2 for Figure 1 View from point AA.

[0022] The reference numerals in the accompanying drawings include: tank body 1, inlet pipe 2, outlet pipe 3, first fixed plate 4, first lifting plate 5, second fixed plate 6, second lifting plate 7, adjusting tank 8, discharge pipe 9, first lead screw 10, first handwheel 11, second lead screw 12, second handwheel 13, bubble generator 14, slag discharge pipe 15, dilution pipe 16, dilution slurry tower 17, rotary grid filter 18, good slurry tank 19, flotation pump 20, good slurry pump 21, screening pump 22, and rinsing pipe 23. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] like Figure 2 As shown, an embodiment of the present invention provides a horizontal flotation cell, which includes: a cell body 1, a first material leveling mechanism, a slurry inlet pipe 2, a slurry outlet pipe 3, and a second material leveling mechanism;

[0026] The first material leveling mechanism includes a first fixed plate 4 and a first lifting plate 5. There is a first gap between the first fixed plate 4 and the top wall of the tank 1, which is used to divide the tank 1 into a left chamber and a right chamber. The first lifting plate 5 slides vertically relative to the first fixed plate 4 to adjust the size of the first gap.

[0027] The slurry inlet pipe 2 is connected to the top wall of the right chamber;

[0028] One end of the slurry outlet pipe 3 is connected to the bottom wall of the right chamber, and the other end of the slurry outlet pipe 3 is connected to one side of the lower end of the regulating trough 8. The other side of the lower end of the regulating trough 8 is connected to the discharge pipe 9.

[0029] The second material level mechanism includes a second fixed plate 6 and a second lifting plate 7 disposed in the adjusting groove 8. There is a second gap between the second fixed plate 6 and the top wall of the adjusting groove 8, which is used to separate the slurry outlet pipe 3 and the discharge pipe 9. The second lifting plate 7 slides vertically relative to the second fixed plate 6 to adjust the size of the second gap.

[0030] The working process of a horizontal flotation cell is as follows:

[0031] Before using this equipment, adjust the height of the first lifting plate 5 and the second lifting plate 7, thereby adjusting the lower edge position of the first interval and the lower edge position of the second interval. The right chamber, the slurry outlet pipe 3 and the regulating tank 8 form a connector to maintain the liquid level in the right chamber.

[0032] The slurry enters the right chamber below the liquid surface through the slurry inlet pipe 2. The lighter polyethylene in the slurry rises to the liquid surface, then rolls over the upper edge of the first lifting plate 5 and reaches the left chamber, thus separating the slurry and polyethylene. Since the slurry outlet pipe 3 is located at the bottom of the right chamber, the polyethylene rises in the right chamber, so the polyethylene cannot enter the slurry outlet pipe 3. The good slurry without polyethylene flows to the regulating tank 8, rolls over the upper edge of the second lifting plate 7, and is discharged through the discharge pipe 9.

[0033] Specifically, the upper edge of the first lifting plate 5 is rotatably connected to the lower end of the first lead screw 10 (the upper edge of the first lifting plate 5 is provided with a groove, the groove opening is fixedly welded to a retaining ring, the lower end of the first lead screw 10 is fixedly connected to a circular retaining block, the circular retaining block is located in the groove, the upper surface of the circular retaining block abuts against the lower surface of the retaining ring to prevent the first lead screw 10 from detaching from the first lifting plate 5, and at the same time, the plate surface of the first lifting plate 5 and the plate surface of the first fixed plate 4 are in contact with each other to prevent the first lifting plate 5 from rotating), the upper end of the first lead screw 10 is threadedly connected to the top wall of the groove 1, and the upper end of the first lead screw 10 is fixedly connected to the first handwheel 11; the upper edge of the second lifting plate 7 is rotatably connected to the lower end of the second lead screw 12 (the connection structure of the second lifting plate 7 and the second lead screw 12 is the same as the connection structure of the first lifting plate 5 and the first lead screw 10), the upper end of the second lead screw 12 is threadedly connected to the top wall of the adjusting groove 8, and the upper end of the second lead screw 12 is fixedly connected to the second handwheel 13;

[0034] The operator rotates the first handwheel 11 and the second handwheel 13, causing the first lead screw 10 to drive the first lifting plate 5 to rise and fall along the surface of the first fixed plate 4, and causing the second lead screw 12 to drive the second lifting plate 7 to rise and fall along the surface of the second fixed plate 6, thereby changing the height of the liquid level at both ends of the connector to meet the needs of polyethylene flotation in the slurry.

[0035] In a specific embodiment, a bubble generator 14 is also included, and the slurry inlet pipe 2 penetrates the top wall of the right chamber and is connected to the bubble generator 14.

[0036] In this embodiment, specifically, the pulp enters the tank 1 through the bubble generator 14 below the pulp inlet pipe 2. Due to the Venturi effect, air is automatically drawn in when the pulp flows through the bubble generator 14, forming a mixture of pulp and microbubbles. The pulp-air mixture is sprayed out from the opening at the lower end of the bubble generator 14 and evenly distributed to the bottom of the tank 1, which facilitates the dispersion of polyethylene flocculents and thus facilitates the subsequent floating of polyethylene.

[0037] In a specific embodiment, it also includes a slag discharge pipe 15 and a dilution pipe 16, wherein the slag discharge pipe 15 is connected to the bottom wall of the left chamber and the dilution pipe 16 is connected to the top wall of the left chamber.

[0038] In this embodiment, specifically, the dilution pipe 16 sprays diluent into the left chamber, so that the polyethylene diluent can be discharged from the left chamber through the slag discharge pipe 15.

[0039] like Figure 1 and Figure 2 As shown, another embodiment of the present invention also provides a device for removing polyethylene film from pulp, comprising: a pulp dilution tower 17, a rotary grid filter 18, a good pulp tank 19, and the aforementioned horizontal flotation tank;

[0040] The lower end of the dilution slurry tower 17 is connected to one end of the slurry inlet pipe 2, and the other end of the slurry inlet pipe 2 is connected to the top wall of the right chamber. One end of the slag discharge pipe 15 is connected to the bottom wall of the left chamber, and the other end is connected to the feed inlet of the rotary grid filter 18. One end of the discharge pipe 9 is connected to the other side of the lower end of the regulating tank 8, and the other end is connected to the good slurry tank 19.

[0041] In this embodiment, specifically, the material received by the dilution tower 17 is the slurry after the extraction of cotton stalk pulp black liquor. The lower end outlet of the dilution tower 17 is connected to the inlet of the flotation pump 20. The outlet of the flotation pump 20 is connected to the top wall of the right chamber through the slurry inlet pipe 2. The other end of the discharge pipe 9 is connected to the inlet of the good slurry pump 21. The outlet of the good slurry pump 21 is connected to the good slurry tank 19. After the slurry in the dilution tower 17 is descaled by flotation in the horizontal flotation tank, the good slurry is transported to the good slurry tank 19 by the good slurry pump 21, and then transported to the screening process by the screening pump 22.

[0042] Specifically, the horizontal flotation cell includes two sections, front and rear. The outlet of the dilution slurry tower 17 is connected to the inlet of the front section flotation pump 20, the lower outlet of the right chamber of the front section is connected to the inlet of the rear section flotation pump 20, and the lower outlet of the right chamber of the rear section is connected to the inlet of the good slurry pump 21.

[0043] Specifically, the screening volume of the front horizontal flotation cell is about 8-10%, and the screening volume of the rear horizontal flotation cell is about 2-5%, with the total slag discharge controlled at 10-15%; after two stages of flotation, the removal rate of polyethylene substances reaches over 97%.

[0044] Specifically, the rotary bar filter 18 is a mechanical filtration device. The filter gaps in the rotary bar filter 18 are approximately 1.5-2.5 mm. It separates large particles or cotton-like polyethylene substances present in the slurry to the maximum extent, achieving the separation of good slurry and slag. Utilizing the centrifugal force of the rotating screen, it achieves high flow velocity with relatively low hydraulic resistance, effectively trapping suspended solids.

[0045] Specifically, the mulch film is primarily made of a milky white, translucent to opaque thermoplastic resin material—polyethylene resin. Polyethylene is a high-molecular-weight polymer, a non-toxic, odorless, and tasteless white granule with a melting point of approximately 110℃-130℃ and a relative density of 0.918-0.965. The specific melting point depends on its molecular weight and degree of polymerization. High-density polyethylene (HDPE) has a melting point between 120-130 degrees Celsius, while low-density polyethylene (LDPE) has a melting point between 105-115 degrees Celsius. The mulch film material is mainly low-density polyethylene. At room temperature, PE is insoluble in any known solvent.

[0046] During the cooking process, the cotton stalk pulp is kept at a temperature of 155-165℃. Under this temperature and pressure, the residual mulch film in the cotton stalks melts into a liquid and becomes invisible. After cooking into pulp, during the cooling and washing process, the adjacent polyethylene will re-solidify into an irregular cotton-like state with a much larger specific surface area than fibers. In addition, the density of polyethylene is 0.918-0.965 g / cm³. 3 It is lower than water and fiber, and will tend to float when the slurry concentration is appropriate and it is gently stirred.

[0047] In a specific embodiment, a flushing pipe 23 is also included, which is connected to the side wall of the dilution pipe 16 and the dilution slurry tower 17 respectively.

[0048] In this embodiment, specifically, the outlet of the flushing pipe 23 is connected to the dilution pipe 16, the side wall of the dilution slurry tower 17, and the inlet pipe of the flotation pump 20. The flushing pipe 23 provides diluent to the dilution pipe 16. At the same time, the flushing pipe 23 can also provide diluent to the dilution slurry tower 17, thereby diluting the slurry in the dilution slurry tower 17 to a concentration of 1-1.5%. Simultaneously, it can also provide diluent to the inlet pipe of the flotation pump 20, thereby ensuring smooth conveying of the flotation pump 20.

[0049] Specifically, the slag is diluted to a concentration of 1-1.5% through the dilution pipe 16 and then pumped to the inlet of the rotary bar filter 18 by the slag pump. The rotary bar of the rotary bar filter 18 rotates under the drive of the transmission mechanism, generating centrifugal force. With low hydraulic resistance, it has a high flow rate, and large particles or cotton-like polyethylene substances in the slurry are separated to the maximum extent, achieving the purpose of two-phase separation of good slurry and slag, and completing the separation process of polyethylene substances such as mulch film from cotton stalk slurry.

[0050] In a specific embodiment, the drain pipe of the rotary grid filter 18 is connected to the slurry tank 19.

[0051] In this embodiment, specifically, within the rotary grid filter 18, the good slurry after the mulch film separation is completed is discharged to the good slurry tank 19 through the drain pipe, which facilitates further improvement of the good slurry yield.

[0052] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A horizontal flotation cell, characterized in that, include: Tank body; The first material leveling mechanism includes a first fixed plate and a first lifting plate. There is a first gap between the first fixed plate and the top wall of the tank body, which is used to divide the tank body into a left chamber and a right chamber. The first lifting plate slides vertically relative to the first fixed plate to adjust the size of the first gap. A slurry inlet pipe is connected to the top wall of the right chamber; The slurry outlet pipe has one end connected to the bottom wall of the right chamber and the other end connected to one side of the lower end of the regulating trough, and the other side of the lower end of the regulating trough is connected to the discharge pipe. The second material leveling mechanism includes a second fixed plate and a second lifting plate disposed in the adjusting trough. There is a second gap between the second fixed plate and the top wall of the adjusting trough, which is used to separate the slurry outlet pipe and the discharge pipe. The second lifting plate slides vertically relative to the second fixed plate to adjust the size of the second gap.

2. The horizontal flotation cell according to claim 1, characterized in that, It also includes a bubble generator, with the slurry inlet pipe penetrating the top wall of the right chamber and connected to the bubble generator.

3. The horizontal flotation cell according to claim 1, characterized in that, It also includes a slag discharge pipe and a dilution pipe, wherein the slag discharge pipe is connected to the bottom wall of the left chamber and the dilution pipe is connected to the top wall of the left chamber.

4. A device for removing polyethylene film from pulp, characterized in that, include: The dilution tank, the rotary grid filter, the good pulp tank, and the horizontal flotation cell as described in claim 3; The lower end of the dilution slurry tower is connected to one end of the slurry inlet pipe, and the other end of the slurry inlet pipe is connected to the top wall of the right chamber. One end of the slag discharge pipe is connected to the bottom wall of the left chamber, and the other end is connected to the feed inlet of the rotary grid filter. One end of the discharge pipe is connected to the other side of the lower end of the regulating tank, and the other end is connected to the good slurry tank.

5. The apparatus for removing polyethylene film from pulp according to claim 4, characterized in that, It also includes flushing pipes, which are respectively connected to the sidewalls of the dilution pipe and the dilution slurry tower.

6. The apparatus for removing polyethylene film from pulp according to claim 4, characterized in that, The drain pipe of the rotary grid filter is connected to the slurry tank.

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