JPH04505190A - Method and apparatus for recovering pulp solids from white water - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] BACKGROUND OF THE INVENTION Method and Apparatus for Recovering Bulb Solids from White Water Today, the papermaking process mainly uses the Fourdrinier method, here called ``wire'' or ``wire mesh.'' Implemented by a method and apparatus that includes a running screen or fabric.

Said wire mesh receives a wood bulb and an associated thin layer of an aqueous dispersion of fiber material. The aqueous dispersion is deposited on a paper sheet on a wire mesh after water removal and drying. is formed as. The water removed from the wire mesh at the beginning of this process is called "white water". , this white water contains a certain amount of fa-reactive material, so Tomei Paper Manufacturing Co., Ltd. It is hoped that the materials will be collected and reused in the paper manufacturing process. The method and apparatus of the present invention , collect as much valuable phi material as possible from white water and circulate it to the papermaking process. It is for the purpose of However, the present invention is applicable to liquid streams in processing steps other than papermaking processes, e.g. Other vegetable fibers such as cotton, animal fibers such as wool, and nylon Valuable materials from dispersions of synthetic fibers such as , acrylonitrile, polyester, etc. Please understand that it can also be used to collect. Furthermore, non-finish materials, Remove these materials from the dispersion system, whether it is recovered or disposed of. The present invention can be practiced if it is desired to do so.

The basic concept of the method and apparatus of the present invention is described in U.S. Pat. No. 4,895.623. It is.

The purpose of the present invention is to recover and remove fiber solids and moisture from white water in the papermaking process. The present invention relates to a new method for treating white water. Another object of the invention is to The present invention relates to an apparatus for carrying out such a method. Still another object of the present invention is to A method for continuously filtering a solid liquid medium in the process of continuously preparing a supermedia. and provide equipment. Still other objects of the present invention will be apparent from the description below. It will be.

Detailed description of the invention The present invention produces solids from white water containing fine valve particles produced in the papermaking process. In a method for removing particles and recovering purified water, (a) A wedge-shaped space between wire meshes that moves continuously in the upper and lower horizontal directions and concentrates on each other. supplying white water containing valve particles into the bath; (b) When the upper wire mesh passes through the space, the upper wire mesh is adjacent to the white water. Apply a siphon action to the side surface and the opposite side surface to place the valve and the fixed material on the upper wire mesh. forming a web of body particles and removing purified water through the web; (c) Collecting the purified water from the siphon means (Tokukaihei 4-505190) (3) stages and 9(d) directing a water spray against said web to remove the web from said upper wire gauze; disengaging and feeding into an aqueous collection boule; (e) recycling the aqueous collection boule to the papermaking process. The present invention relates to a method characterized by:

Preferably, the solids entrained in the white water fed into the upper adjacent area of the lower wire gauze are To enhance entrapment, a valve aqueous dispersion system is introduced into the lower adjacent area of the upper wire mesh. Ru.

The present invention uses water from white water containing fine valve particles that has passed through the papermaking process using a Fourdrinier paper machine. In the device L for separating solid fine particles, (a) moving adjacent and parallel to each other in a substantially horizontal direction through the web forming area; The upper and lower long wire endless wire meshes are constructed in such a way that these wire meshes are concentrated on each other. Upper and lower wire mesh forming a wedge-shaped space with a large entrance and a small exit. , (b) moving at substantially constant speed while holding the upper and lower wire meshes adjacent to each other and separate; and (c) a driving means for discharging the white water between the valve aqueous dispersion system and the lower metal mesh. an inlet pipe introducing the flow as an evenly distributed flow along the width of the tube-forming area; (d) Adjacent to the side surface of the lower wire mesh opposite to the side surface contacted by the white water flow. (e) a solid fluid barrier positioned immediately downstream of said web forming zone; Valve particles and solid particles that come into contact with the lower surface of the wire mesh and are trapped between the wire mesh a vacuum suction box for pulling the child onto the lower wire mesh and supporting it on the lower wire mesh; (f) said suction for washing solid material from said upper and lower wire meshes into the container; a water spray disposed downstream of the draw box, the sprayer being in the container; - a water spray adapted to receive water and solid material; and (g) said web formation. a level at which said web-forming area is continuously immersed in water as water exits the area; a siphon means for holding; (h) a container for receiving water flowing out of said web forming area by siphon means; The present invention relates to an apparatus including:

Preferably, a valve aqueous dispersion is introduced at the entrance of said wedge-shaped space. oriented to contact said upper wire mesh and run along the width of said web forming area. Qualitatively evenly distributed inlet tubes are provided.

Brief description of the drawing The present invention will be described below with reference to embodiments shown in the drawings. It is not limited.

FIG. 1 shows the first part of the web forming section of the apparatus of the invention in which a single filter nib is formed. 2 is a side sectional view of the embodiment of FIG. 1, and FIG. Aspects of a second embodiment of the web forming part of the apparatus of the invention in which a filter web is formed A cross-sectional view, and FIG. 4 is a vertical cross-section showing the entire device of the present invention using FIGS. 1 and 2. figure, Figure 5 is a cross-sectional view taken along line 5-5 in Figure 4, and Figure 6 is a cross-sectional view taken using the apparatus shown in Figure 3. 1 is a vertical sectional view showing the entire apparatus of the present invention.

Detailed description of the invention Embodiments of the present invention shown in the drawings will be described below.

FIGS. 1-3 show the structure as claimed and described in U.S. Pat. 1 shows a web forming part and a method for forming a fourdrinier paper machine according to the present invention, which operates as shown in FIG. . The upper wire mesh 12 is guided around rollers 25 and serves as a dewatering device that acts as a siphon. It passes below the station 10. Correspondingly, the lower wire mesh 1 is arranged around the roll 26. adjacent to said wire mesh 12, both wire meshes traveling substantially parallel at the same speed. Ru. When these upper wire mesh and lower wire mesh pass through the dewatering device 1o, they concentrate on each other and interact with each other. Define wedge-shaped spaces or areas between each other. The lower wire mesh 11 is a solid plate 1 3, this plate 13 forms a liquid flow barrier.

Water is removed by means of a siphon in the dehydrator 10 having a level 29. slight The white water 27 containing particles etc. is supplied from the supply [28 to the upper side of the lower wire mesh 11] be done.

In U.S. Pat. No. 4,893,823, an aqueous dispersion of bulbs instead of white water is used. The system is fed with water that remains after passing through the Fourdrinier machine. White water is dehydrated When passing under the paper stock 73, the water in the paper stock 73 is removed by the dewatering system. It is absorbed by the ON action, and the level in the container 10 becomes 29, which is the float level. Controlled by the stem 24, the water drains continuously through the drain valve 2]8.22. be done. During this drainage time, the paper stock 73 on the wire mesh 11 is immersed in water, so There is no air-water meniscus on or near the wire mesh 11.

In FIG. 2 the siphon means and level control member are shown in more detail and the structure In the construction, water from the paper stock 73 flows upward through the manifold 15 to the drainage tank 1. It flows to 6.

Figure 3 shows a system similar to Figures 1 and 2, except that the siphon means is They are arranged above and below 73.

A container 110 similar to the dehydration container 10 is placed in contact with the lower wire mesh 11, and the plate 13 is has been removed.

In the method and apparatus of the present invention, the method and apparatus described in U.S. Pat. A white water treatment principle similar to that used was used to recover the valve solids contained in the white water. At the same time, the liquid phase of white water is purified [7. produces purified water for use at desired locations. Figure 4 and figure 5 contain figures 1 and 5. Dehydrated wallet special topsoil 4-505190 (4) shown in Figure 2 The entire apparatus of the present invention using the on-system is shown in FIG. 6, and FIG. An apparatus using a dehydrating siphon system is shown.

Referring to FIG. 4, the lower wire mesh 11 supported on the upper wire mesh 12 and the plate 13 are close to each other at a certain angle, forming a wedge-shaped space 64. this space 64 is supplied with white water from supply line 62 through pipe 59 . Preferably , intermediate the outlet of the pipe 59 and the upper wire mesh 12, a pipe 67 as a branch of the supply line 66. Through the valve the aqueous dispersion is fed. This dispersion system is described in U.S. Patent No. 4.89. It should be similar to the stock 28 from the feed box of No. 3,623, or removes surfactants, dispersants, bleaches and other additives contained in conventional valve stock. It is possible to create a simple valve aqueous dispersion system containing no alcohol. The end of the tube 67 is The dispersion system is formed so as to come into contact with the upper wire mesh 12 when approaching the front end of the dehydration container 10. It will be done. Therefore, the valve in the aqueous dispersion system coming out of the pipe 67 is sucked into the wire mesh 12 and applied. as the wire mesh 12 moves along the side surface 14 of the container 10. Form a taweb. Since there is a barrier plate 13 that supports the lower wire mesh 11, , water cannot fall downward from the wedge-shaped space 64.

After passing the downstream end of the container 10, the lower wire mesh 12 and the lower wire mesh 1 are separated from each other and turned over. 12. Go through the system again. At the downstream end of the system, a suction box 53 Pull the filter web 71 from the upper wire mesh 12 to the lower wire mesh 11, and then The filter web 71 is washed from the gold by passing under a powerful water spray 51. and fell into the concentration valve boule 49 in the tank 48, from 47 to 46 The paper is discharged in the direction of paper and recycled into the papermaking process.

The upper wire mesh 12 passes through another spray 45 and removes the remaining valve valve adhered to this one wire mesh. The fibers are washed away.

The white water coming out of the tube 59 is sucked through the filter web 71 to remove the solids it contains. particles (usually fiber granules or the like) that are captured by this filter web. The filtered water enters the boule 56 through the discharge valve 2] and flows in the direction of the arrow from the discharge port 57. 58 and be discharged elsewhere, e.g. as a spray 45.51 or in a paper plant. used elsewhere in .

FIG. 5 shows a cross-section of tube 59, with white water running along its entire width between wire meshes 1 and 12. Evenly distributed to break up large chunks or prevent foreign objects from getting between the wire mesh. state.

In FIG. 6, a process and apparatus similar to that of FIG. 4 is illustrated, but this In some cases, the bellier 13 is removed and instead has a suction port with a deflector. and a dehydration container (similar to 10, omitted for brevity). It is placed. The white water is sent through five pipes (7) to the center of the wedge-shaped space 64, Also, the valve aqueous dispersion system coming out of the supply line 66 is connected to the upper wire mesh 12 through a pipe 67. At the same time, the pipe 167 is passed through 5 and the lower wire mesh 11 is brought into contact. In this way, the top A filter web 71 is formed on the wire mesh unit 2, and a similar web is formed on the lower wire mesh unit 2. A filter web 17] is formed between which the white water is passed.

The siphon system sucks water through the filter webs 71 and 17] and It is collected in a tube 56 and recycled to the papermaking process through an outlet 57. top and bottom filters The webs 71 and 171 come into contact with wire mesh Co. 2 and Co. 1 respectively [7] and move forward, spraying 4 5.51 and enters the concentration valve boule 49, and this valve The paper is circulated through outlet 47 2 to the papermaking process. The suction box 53 (Fig. 4) It has been removed as it is not necessary in this structure, but if desired, the ・I container] downstream of 0 (ko).

It can be placed on top of the lower wire mesh.

The system of the invention can be used for the filtration of other media than white water. liquid Solid dispersions in water (particularly in water) are treated according to the invention to separate solids and purify water. I7, each can be collected or recycled.

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Claims (14)

[Claims] 1. Solid particles are extracted from white water containing fine pulp particles produced in the paper manufacturing process. In a method for removing and recovering purified water, (a) A wedge-shaped space between wire meshes that moves continuously in the upper and lower horizontal directions and concentrates on each other. supplying white water containing pulp particles into the bath; (b) When the upper wire mesh passes through the space, the upper wire mesh is adjacent to the white water. A siphon effect is applied to the side and the opposite side to place the pulp and solid on the upper wire mesh. forming a web of body particles and removing purified water through the web; (c) recovering said purified water from said siphon means; (d) directing a water spray toward the web to remove the web from the upper wire gauze; sending the mixture into an aqueous collection pool; (e) recycling the aqueous collection pool to the papermaking process. How to do it. 2. The lower wire mesh is supported from below by a solid horizontal barrier and runs over this barrier. sliding, wherein said adjacent upper wire mesh is subjected to the action of said siphon means. 2. The method according to claim 1. 3. An aqueous dispersion of pulp is fed below and adjacent to the upper wire gauze, and the aqueous dispersion of the pulp is The pulp is formed as a filter web on top wire gauze to remove solid particles from the white water. 2. A method according to claim 1, characterized in that removal is facilitated. 4. Next, using suction means, the filter web on the upper wire mesh is removed from the upper wire mesh. The web on the upper wire mesh is separated from the upper wire mesh by dropping it onto the lower wire mesh. 2. The method of claim 1, further comprising the step of transferring to a lower wire gauze. 5. After removing the web on the upper wire mesh from the upper wire mesh, the upper wire mesh is sprayed with water. washing to remove residual pulp or particulates and sending it into the pool. 5. The method according to claim 4, characterized in that: 6. The step (a) includes feeding the first pulp layer adjacent to the upper wire gauze. , feeding a second pulp layer adjacent to the lower wire gauze, wherein the white water is Claim 3 characterized in that the pulp is fed between the first pulp layer and the second pulp layer. The method described in. 7. In step (b), the side of the lower wire mesh adjacent to the second pulp layer and the opposite side 7. The method according to claim 6, further comprising the step of applying siphon means to a side of the How to put it on. 8. Solid fine particles are extracted from the water content of white water containing pulp fine particles that have passed through the papermaking process of a Fourdrinier paper machine. in an apparatus for separating (a) adjacent and parallel to each other through the web forming area; An upper and lower long wire endless wire mesh configured to move almost horizontally, wire meshes are concentrated on each other to form a wedge-shaped space with a large entrance and a small exit. The upper and lower wire meshes that make up the (b) driving means for moving the upper and lower wire meshes at substantially constant speed; (c) substantially uniformly between said upper and lower wire meshes along the width of said web forming area; The wire mesh is narrower so as to introduce white water containing pulp fine particles as a distributed stream. and an inlet pipe having a width. 9. moreover, (d) a site for extracting white water from the white water in the web forming area through the upper wire gauze; means for discharging said web as purified water exits said web forming area; siphon means for maintaining a level such that the forming area is continuously immersed in water; (e) receiving purified water flowing out of said web forming area by said siphon means; a first container for circulating the purified water in the paper manufacturing process; (f) pulp particulates collected from the wire gauze downstream of the web forming zone; and solid fine particles, which are then circulated into the pulp aqueous dispersion system of the papermaking process. 2 containers and (g) for introducing a pulp aqueous dispersion at the entrance of said wedge-shaped space; The web forming member has a width narrower than the wire mesh and is oriented to contact the upper wire mesh. inlet trays substantially evenly distributed along the width of the area, the inlet tubes being substantially uniformly distributed along the width of the area; The white water is supplied between the pulp aqueous dispersion system and the lower wire mesh. 9. The apparatus of claim 8, further comprising an inlet tray. 10. moreover, (h) a solid fluid barrier in contact with the lower surface of the lower wire mesh; (i) contacting the lower surface of the lower wire mesh immediately downstream of the web forming area; Pulp particles and solid particles captured between the wire meshes are pulled onto the lower wire mesh. a vacuum suction box to be supported on the lower wire mesh; and (j) the upper and lower wire meshes. downstream of the suction box for washing solid material from the suction box into the second container. a water spray placed between the spray water and the solid material in the second container; and a water spray adapted to receive the water spray. Place. 11. The upper and lower wire meshes expand to be separated from each other after passing through the suction box. 11. The device according to claim 10. 12. The upper and lower wire meshes exert a compressive force on the solid in the web forming area. 10. Device according to claim 9, characterized in that they are mutually concentrated to the extent that they occur. 13. moreover, (h) introducing a second pulp aqueous dispersion at the entrance of the wedge-shaped space; substantially along the width of the web forming area and oriented in contact with the lower wire gauze. a second inlet tray, the siphon means being evenly distributed over the wafer; White water is extracted from the white water in the sieve formation area through the lower wire mesh, and the siphon is Negative pressure in the means causes purified water to flow from the web forming area into the first container. maintain a level such that the web-forming area is continuously immersed in water when 10. The device according to claim 9, characterized in that: 14. moreover, (i) disposed downstream of said web forming zone for cleaning said wire gauze to remove pulp from said wire gauze; a water spray for removing and discharging particulates and solid particulates into said second container; 14. The device according to claim 13, characterized in that: