Pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers

Abstract

The utility model discloses a pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers, which comprises a pulping pool, an acid treatment tank, a vacuum belt filter, a washing barrel, a presser and a dipping barrel which are sequentially connected through a delivery pump, and an inlet of the pulping pool is connected with a papermaking bamboo pulp delivery line. And an outlet of the dipping barrel is connected with a viscose production line. Impurities of bamboo cellulose can be greatly reduced, the purity of the cellulose is improved, after viscose production, the dipping effect is obviously improved, the aging polymerization reduction time is greatly shortened, the yellowing quality is obviously improved, and the spinnability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of viscose fiber production in the textile industry, in particular to a pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers. Background Art

[0002] In the current viscose staple fiber production sector, pulp intrinsic quality significantly impacts production, and various pulp testing parameters are key process indicators. Bamboo pulp for papermaking, in particular, has higher silica and ash content compared to wood and dissolving pulps, making production control more challenging. Furthermore, its high cellulose polymerization degree hinders degradation during aging. Furthermore, its wide cellulose length distribution, without screening, can severely impact impregnation efficiency and product quality.

[0003] Compared with wood, bamboo contains higher contents of ash (about 1.0%) and 1% NaOH extract (about 30.0%), which will produce more impurities during the pulping process. This is not conducive to the sewage discharge and wastewater treatment of the pulp and paper industry, and will increase the investment cost of some equipment. Bamboo pulp for papermaking is basically not suitable for viscose production.

[0004] In the current viscose production impregnation process, Fe in the ash of bamboo pulp for papermaking 2+ 、Mn 2+ The aging process is accelerated by depolymerization, making it difficult to control the aging process and causing large fluctuations in viscose viscosity. In the viscose staple fiber production process, how to reduce the content of hemicellulose and increase the content of methylcellulose is an urgent problem to be solved. Utility Model Content

[0005] The utility model aims to provide a pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers, which can significantly reduce the impurities in bamboo cellulose itself and improve the purity of cellulose. After viscose production, the impregnation effect is significantly improved, the aging and degradation time is greatly shortened, the yellowing quality is significantly improved, and the spinnability is good.

[0006] In order to achieve the above-mentioned purpose of the invention, the technical solution of the present utility model is as follows:

[0007] A pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers comprises a pulping tank, an acid treatment tank, a vacuum belt filter, a washing barrel, a press, and an impregnation barrel, which are sequentially connected via a delivery pump. The inlet of the pulping tank is connected to a papermaking bamboo pulp delivery line, and the outlet of the impregnation barrel is connected to a viscose production line.

[0008] The two acid treatment tanks are provided with two acid treatment tanks, which are connected in series or in parallel. The tops of the acid treatment tanks are equipped with acid corrosion-resistant stirring devices. The stirring devices are provided with three layers of stirring blades: upper, middle and lower, which can achieve mixing and stirring effects at different liquid levels. The two acid treatment tanks are connected by FRPP material pipes. The acid treatment tanks remove ash, metal impurities, etc. in the bamboo pulp by adding various agents.

[0009] The acid treatment tanks are respectively provided with reagent feeding ports, the reagent feeding ports are connected to the reagent mixing tank, and the inlet of the reagent mixing tank is connected to the acid reagent storage tank.

[0010] The vacuum belt filter includes a vacuum belt filter assembly and a recovery water tank. The recovery water tank is connected to the water outlet at the bottom of the vacuum belt filter assembly. A water spraying mechanism is provided on the top of the vacuum belt filter assembly. The water spraying mechanism is connected to the soft water pipe and the recovery water tank at the same time. When there is sufficient water in the recovery water tank, the recovered water is used for spraying and circulating water. The vacuum filter assembly separates the water and cellulose in the porridge through vacuum adsorption. The water enters the recovery water tank and the cellulose enters the next process.

[0011] The vacuum belt filter assembly is a three-section vacuum belt filter assembly, with each 6 meters forming a section. The bottom of each section of the vacuum belt filter assembly is connected to a recovery water tank.

[0012] The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers is further provided with a hot water tank, which is provided with a heat exchanger heated by steam, and the outlet of the hot water tank is connected to the pulping tank and the acid treatment tank.

[0013] The press includes a pressing component and a pressing water storage tank, the bottom of the pressing component is connected to the pressing water storage tank, and the outlet of the pressing water storage tank is connected to the pulping tank; the pressing component separates water and cellulose in the pulp by pressing, the separated cellulose enters the impregnation barrel for impregnation, and the separated water enters the pressing water storage tank and is transported to the pulping tank by a delivery pump for recycling.

[0014] Beneficial effects of the utility model:

[0015] 1. This utility model reduces the ash content in bamboo cellulose and appropriately lowers its degree of polymerization. This facilitates the formation of alkali cellulose in viscose production, effectively shortening the aging time and achieving stable production and quality assurance. Furthermore, the device reduces the metal and silica content, facilitating the production of specialized pulp for Lyocell. This papermaking bamboo pulp pretreatment device effectively addresses viscose production quality issues such as uneven impregnation, difficulty in aging and depolymerization, and poor yellowing caused by variations in bamboo pulp varieties. It also addresses quality bottlenecks in Lyocell pulp production, such as high metal content.

[0016] 2. This utility model effectively solves the problem of pulp quality differences caused by different bamboo slice cooking processes during the production process, thus safeguarding viscose production.

[0017] 3. The present invention is not only applicable to bamboo pulp, but also to the pre-treatment of softwood pulp, broadleaf pulp and other pulps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers according to the present invention.

[0019] Among them, 1. pulping tank; 2. acid treatment tank; 21. chemical mixing tank; 22. acid chemical storage tank; 3. vacuum belt filter; 31. vacuum belt filter assembly; 32. recovery water tank; 4. washing barrel; 5. press; 51. pressing assembly; 52. pressing water storage tank; 6. impregnation barrel; 7. papermaking bamboo pulp conveyor line; 8. hot water tank. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the embodiments, but the embodiments of the present invention are not limited thereto.

[0021] Example 1

[0022] This embodiment provides a pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers, comprising a pulping tank 1, an acid treatment tank 2, a vacuum belt filter 3, a washing barrel 4, a press 5, and an impregnation barrel 6 connected in sequence via a conveying pump, wherein the inlet of the pulping tank 1 is connected to a papermaking bamboo pulp conveying line 7, and the outlet of the impregnation barrel 6 is connected to a viscose production line.

[0023] In this embodiment, a pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers performs a softening pretreatment on the papermaking bamboo pulp, mixes the papermaking bamboo pulp with softened water in a pulping tank 1, and uniformly disperses the bamboo cellulose in the softened water through high-speed rotation and shearing action of stirring to form a fluid pulp porridge; the bamboo cellulose pulp porridge is acidified in an acid treatment tank 2, and the acid treatment in the acid treatment tank 2 performs functions such as removing ash, removing metal precursors such as iron, calcium, and magnesium, and removing silica, and at the same time, reducing the degree of polymerization of the bamboo cellulose; a vacuum belt filter 3 separates the water and cellulose in the pulp porridge by vacuum adsorption, and the water enters a recovery water tank 32, and the cellulose enters the next process; after vacuum adsorption, the cellulose enters a washing barrel 4 and water is added to form a pulp porridge, and the acid inside the cellulose is dissolved; and the water and cellulose of the pulp porridge are separated by a press 5, and the separated cellulose enters an impregnation barrel 6 for impregnation, and after the impregnation is completed, it enters a viscose production line for viscose production.

[0024] Example 2

[0025] The difference between this embodiment and embodiment 1 is that, in this embodiment,

[0026] Two acid treatment tanks 2 are provided, and the two acid treatment tanks 2 are connected in series or in parallel. The top of each acid treatment tank 2 is equipped with an acid corrosion-resistant stirring device, and the stirring device is provided with three layers of stirring blades: upper, middle, and lower. The two acid treatment tanks 2 are connected by a FRPP material pipe. The acid treatment tanks 2 are respectively provided with a reagent feed port, and the reagent feed port is connected to a reagent mixing tank 21. The inlet of the reagent mixing tank 21 is connected to the acid reagent storage tank 22. The rest of the structure is the same as that of Example 1.

[0027] In this embodiment, the stirring device is provided with three layers of stirring blades, namely upper, middle and lower layers, to achieve mixing and stirring effects at different liquid levels.

[0028] In this embodiment, the acid treatment tank 2 removes ash, metal impurities, etc. in the bamboo pulp by adding various reagents. The two acid treatment tanks 2 can be switched in series or in parallel. When the two acid treatment tanks 2 are switched in series, the pulp porridge in the first acid treatment tank 2 is pumped into the second acid treatment tank 2, and the materials can be continuously operated;

[0029] The purpose of parallel use is to meet the intermittent use of materials. After the first acid treatment tank 2 completes the acid treatment, the material is pumped into the suction filter for dehydration. At this time, the second acid treatment tank 2 can enter the material and carry out acid treatment. When the first acid treatment tank 2 completes the discharge, the second acid treatment tank 2 starts to discharge. This repeated switching ensures the uniformity of the material in each tank.

[0030] Example 3

[0031] The difference between this embodiment and embodiment 1 is that, in this embodiment,

[0032] The vacuum belt filter 3 includes a vacuum belt filter assembly 31 and a recovery water tank 32. The recovery water tank 32 is connected to the water outlet at the bottom of the vacuum belt filter assembly 31. A water spraying mechanism is provided on the top of the vacuum belt filter assembly 31. The water spraying mechanism is connected to the soft water pipe and the recovery water tank 32 at the same time. The vacuum belt filter assembly 31 is a three-section vacuum belt filter assembly, with one section every 6 meters. The bottom of each section of the vacuum belt filter assembly is respectively connected to a recovery water tank 32. The rest of the structure is the same as that of Example 1.

[0033] In this embodiment, the vacuum belt filter 3 uses a suction filter of model XL-10M², manufactured by Yantai Bairun Machinery Co., Ltd.

[0034] In this embodiment, the filter is divided into three sections, each of which is connected to a vacuum adsorption tube, the purpose of which is to absorb the moisture in the material. Soft water pipes are installed in the upper, middle and lower sections of the suction filter, and soft water can be sprayed on the surface of the material to achieve the effect of washing; the vacuum filtration component separates the water and cellulose in the porridge by vacuum adsorption, and the water enters the recovery water tank 32, and the cellulose enters the next process; the water spraying mechanism is connected to the soft water pipe and the recovery water tank 32 at the same time, and when there is sufficient water in the recovery water tank 32, the recovered water is used for spraying and circulating water.

[0035] Example 4

[0036] This embodiment differs from Example 1 in that the pretreatment apparatus for modifying bamboo pulp for papermaking to produce viscose staple fibers is further provided with a hot water tank 8 equipped with a steam-heated heat exchanger, the outlet of which is connected to the pulping tank 1 and the acid treatment tank 2. The remaining structure is the same as that of Example 1.

[0037] In this embodiment, the purpose of the hot water tank 8 is to heat the soft water. The heated soft water is connected to the pulping tank 1 to achieve the effect of heating the material temperature. The effect is to increase the temperature of the porridge, which is conducive to the dissolution of organic and inorganic impurities and their penetration into the impregnation liquid.

[0038] Example 5

[0039] Compared with Example 1, the present embodiment differs in that, in the present embodiment, the press 5 includes a pressing component 52 and a pressing water storage tank 51, the bottom of the pressing component 52 is connected to the pressing water storage tank 51, and the outlet of the pressing water storage tank 51 is connected to the pulping tank 1; the rest of the structure is the same as that of Example 1.

[0040] In this embodiment, the squeezer 5 is a suction filter of model ZYR055.

[0041] In this embodiment, the pressing component 52 separates the water and cellulose in the pulp by pressing, the separated cellulose enters the impregnation barrel 6 for impregnation, and the separated water enters the pressing water storage tank 51 and is transported to the pulping tank 1 by the delivery pump for recycling.

[0042] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A pretreatment device for modifying bamboo pulp for papermaking to prepare viscose staple fibers, characterized by: The invention comprises a pulping tank (1), an acid treatment tank (2), a vacuum belt filter (3), a washing barrel (4), a press (5) and an impregnation barrel (6) which are sequentially connected via a delivery pump. The inlet of the pulping tank (1) is connected to a papermaking bamboo pulp delivery line (7), and the outlet of the impregnation barrel (6) is connected to a viscose production line.

2. The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers according to claim 1, characterized in that: The acid treatment tanks (2) are provided with two, and the two acid treatment tanks (2) are connected in series or in parallel with each other. The tops of the acid treatment tanks (2) are both provided with acid corrosion-resistant stirring devices, and the stirring devices are provided with upper, middle and lower three layers of stirring blades.

3. The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers according to claim 2, characterized in that: The acid treatment tanks (2) are each provided with a reagent feed port, the reagent feed port is connected to a reagent mixing tank (21), and the inlet of the reagent mixing tank (21) is connected to an acid reagent storage tank (22).

4. The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers according to claim 1, characterized in that: The vacuum belt filter (3) comprises a vacuum belt filter assembly (31) and a recovery water tank (32), wherein the recovery water tank (32) is connected to a water outlet at the bottom of the vacuum belt filter assembly (31), and a water spray mechanism is provided at the top of the vacuum belt filter assembly (31).

5. The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers according to claim 4, characterized in that: The vacuum belt filter assembly (31) is a three-section vacuum belt filter assembly, with each section being 6 meters long. The bottom of each section of the vacuum belt filter assembly is connected to a recovery water tank (32).

6. The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers according to claim 1, characterized in that: The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers further comprises a hot water tank (8), the hot water tank (8) being provided with a heat exchanger heated by steam, and the outlet of the hot water tank (8) being connected to the pulping tank (1) and the acid treatment tank (2).

7. The pretreatment device for modifying papermaking bamboo pulp for preparing viscose staple fibers according to claim 1, characterized in that: The press (5) comprises a pressing component (52) and a pressing water storage tank (51); the bottom of the pressing component (52) is connected to the pressing water storage tank (51); and the outlet of the pressing water storage tank (51) is connected to the pulping tank (1).

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