JPH04503537A - Method and apparatus for washing pulp suspension - 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] Method and apparatus for washing pulp suspension The present invention cleans pulp suspensions to remove contaminant particles regardless of weight and fibers. Relates to lossless cleaning methods and devices.

The purpose of the present invention is to develop a highly efficient pulp that can remove contaminant particles regardless of their weight or weight. An object of the present invention is to provide a method and apparatus for cleaning a liquid suspension. Distinguishing the invention from known technology The features are as disclosed in the claims below.

The invention will be described in detail below with reference to the accompanying drawings. In the attached drawings, FIG. 1 shows a preferred implementation of the fiber recovery system of the present invention for the separation of heavy contaminant particles. FIG. 3 is a schematic side view, partially in section, of an example;

Figure 2 shows the method of the present invention for separating light contaminant particles such as polymers and sticky substances. FIG. 2 is a side view schematically showing an example of a fiber recovery system, partially in cross section.

The fiber recovery system of the present invention shown in FIG. , containers 4, 5 and at least one if at least two containers 4.5 are provided. The connecting mechanism includes a connecting pipe 6. Lower cone and flap of cyclone (not shown) Connect the flange with the flange 7 of the cone 1.

The fibers or pulp suspension to be cleaned is tangentially removed from the cyclone inlet under a predetermined pressure. Inject into. In the cyclone, the suspension is separated into a passed part (washed suspension) and a rejected part. (Not only heavy contaminant particles, but also light contaminant particles contain contaminant particles. (unwashed suspension) and Known technology recycles all fibers It is impossible to collect the fibers in cleaning solutions, and some of the fibers are released into the sea. . In contrast, in the present invention all fibers are recycled, e.g. It is collected at the final stage.

Cleaning or separation according to the method of the invention involves forcing the rejects into a cone 1 and exiting with radius d. This is done by pressing towards the mouth 13. The rejected portion is spread out inside the conical casing 2. The liquid flows into the container 4 through the gap 17 between the container 4 and the suction tube 3.

Heavy contamination occurs in the vessel 4°5, the height H of which determines the residence time in the fiber recovery system. Particles are separated (e.g. sand in suspension). The pulp suspension passes through the connecting pipe 6. This process favorably separates the fine sand. heavy Contaminant particles settle at the bottom of both containers, so remove them manually or automatically from the bottom of both containers. You can take out the sludge.

When the suspension flows into the container 4 through the gap 17, the outlet of diameter d of the cone 1 and the suction tube 3 A vacuum zone is generated between the open end 16 of the diameter of the suction tube 3 and the tail end of the suction tube 3 All of the suspension that has reached the level 18 flows back through the cone 1 to the cyclone.

The diameter d of the outlet 13 of the cone 1 and the diameter of the open end 16 of the suction tube 3 are as described below. Sea urchins are extremely important. A cyclone with a small capacity, e.g. 1001/mtn In the case of a cone or cleaner, the outlet diameter d of the cone 1 is small (for example, several mm). It is. This is because the suction tube 3 is more likely to be clogged with fibers than the outlet 13 of the cone body 1 having a diameter of d. , the open end 16 of the suction tube 3 must be sized the same as the outlet 13 of the cone 1. stomach.

The diameter of the open end 16 of the suction tube 3 must be much larger than the diameter d. . Only if the diameter d of the cone 1 reaches approximately 30-40 m+n, the diameter also reaches 40 m. It can be set to m. If d is set large, the diameter may be smaller than the diameter d, as shown in Fig. The distance A shown in 1 can be reduced to zero. Geometry of cone 1 and suction tube 3 conditions, from the outlet 13 of the cone 1 with a diameter d to the diametrically open end 16 of the suction tube 3. of the distance A, the residence time of the suspension in the container (depending on the height H) and the number of containers. All are relevant to determining the cleaning efficiency of the fiber recovery system.

The fiber recovery system may be configured to include a single container 4 with a suction tube 3 or a It may be configured to include a plurality of containers connected to each other via the continuation pipe 6. container 4 A valve 8 is provided for supplying water when dilution is required.

Reducing fiber consistency increases cleaning efficiency.

For example, adhesive substances (stickies) that may be present in some pulp suspensions. Separation of such light contaminant particles can be achieved by the configuration shown in FIG. like this Sticky substances are especially present in fibers recycled from waste paper, and are found in envelopes (glue) and books. It comes out from the back. The fibers contained in the rejected material are separated from the sticky material, and the cleaning process The same method as described for heavy contaminant particles is used, although there are some changes to bring the fibers back to acceptable quality. Process in the same way. The connecting tube 9 terminates at the top of the vessel or vessels to be connected. Configure. That is, the sticky substance collects (accumulates) on the upper surface of the container.

relatively low near the bottom of the container to aspirate the pulp suspension that does not contain sticky substances. A suction pipe 10 is provided at the level.

By providing a valve 11 just below the top of the connecting pipe 9, it is possible to contain concentrated sticky substances. Release the suspension. Light pollution particles are separated from the outside, e.g. The connecting pipe 1 of the container 5 shown in FIG. 2.

Copy and translation of written amendment) Submission form (Article 184-8 of the Patent Law) Same as August 13, 1991

Claims (3)

[Claims] 1. Washing the pulp suspension to remove not only heavy contamination particles but also light contamination particles Therefore, the fiber recovery system is connected to the cyclone or cleaner via connecting means (1, 2). a device consisting of at least one container (4, 5) with a possible opening (15); , the connecting means (1, 2) converge towards the container (4) and the ends meet in a predetermined position. consisting of a cone (1) defining an outlet (13) with a diameter (d); The outlet (13) of (1) is at a predetermined distance (A) from the opening (15) of the container (4). Insert the cone (1) into the opening (15) of the container (4) so that the free end ( 14) is inserted into the fixed conical casing (2), and the container (4) is connected to the suction tube ( 3), the suction tube (3) having one end thereof concentric with the opening (15) of the container (4). said opening (1) with an open end (16) of a predetermined diameter (D) occupying a position in relation to said 5) forming an annular gap (17) between the suction tube (3) and the container (4); A suction tube (3) extends downward into the container (4) or an adjacent container, having a second end (18) at a predetermined distance from the bottom and containing the dirt to be separated from the pulp suspension; An apparatus characterized in that the distance is determined according to the weight and weight of dye particles. 2. The diameter (D) of the open end (16) of the suction tube (3) preferably corresponds to the exit of the cone (1). Device according to claim 1, characterized in that it is larger than the diameter (d) of the mouth (13). 3. Heavy contaminated particles are removed from the pulp suspension by a fiber recovery system comprising an apparatus according to claim 1. In a cleaning method that removes not only particles but also light contaminant particles, The rejected portion is pushed into the cone (1) and pushed out from the outlet (13) downwards. It expands and expands within the conical casing (2) and flows into the container (4) through the gap (17). This generates a vacuum, which causes the suction tube (3) near the end (18) The entire pulp suspension is passed through the suction tube (3) and through the cone (1) into the cyclone. A cleaning method characterized by backflowing into a tank or cleaner.