Complete equipment for recycling papermaking green mud

Abstract

The utility model relates to the technical field of papermaking waste reutilization, and discloses complete equipment for recycling papermaking green mud, which comprises a rinsing bath, a thickener, a deflocculating machine, a screening machine and a receiving tank which are sequentially connected through pipelines, the rinsing bath is used for receiving and diluting the green mud, the thickener is used for washing water and separating material residues from the green mud, and the deflocculating machine is used for deflocculating the green mud. The deflocculation machine is used for grinding material residues, the screening machine is used for screening the material residues, the material receiving groove is used for storing the material residues, and the material receiving groove is connected with a papermaking workshop and used for conveying the material residues to the papermaking workshop to serve as papermaking filler; the device further comprises a concentrated water tank and a spray drying tower, the concentrated water tank is used for receiving washing water of the thickener, and the spray drying tower enables the washing water to form sodium carbonate. According to the utility model, the thickening device is used for separating washing water from material residues, the washing water is evaporated and crystallized through the spray drying tower to form a sodium carbonate product, and the material residues are ground and screened to be returned to a papermaking process as papermaking filler for recycling, so that papermaking green mud is turned into wealth.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking waste recycling, in particular to a complete set of equipment for recycling and treating papermaking green mud. Background Art

[0002] The papermaking industry is one of the important basic industries of my country's national economy. In addition to a large amount of sewage, a large amount of solid waste is also generated during the papermaking process. Solid waste in the pulp and paper industry includes the waste residue of raw material preparation in the production of primary pulp, green mud in the alkali recovery workshop, sludge from wastewater treatment, and deinking sludge generated in the process of secondary fiber utilization.

[0003] In the process of pulp and paper production, a large amount of green mud is produced in the alkali recovery causticization process. It has a complex composition and a high water content, and contains a large amount of alkali, calcium carbonate, calcium silicate, magnesium, silicon, iron, organic matter, free carbon and other substances. Since green mud contains a small amount of alkali, the method of treating it is still a difficult problem in the industry; currently, there are mainly the following ways to treat papermaking green mud:

[0004] 1. Disposal by landfill, which not only occupies a large amount of land, but also causes environmental pollution and prevents plants from growing. In the long run, it will cause serious damage to the environment. At the same time, it is necessary to set up a yard in the factory for transportation, which seriously pollutes the environment and affects clean production;

[0005] 2. Incineration: This method has low economic benefits and serious environmental pollution;

[0006] 3. Brick making and production of building materials. This method cannot control problems such as alkali hazards.

[0007] The annual output of raw pulp for papermaking in my country has reached 40 million tons, and more than 2 million tons of green mud need to be processed every year. At present, the green mud for papermaking cannot be utilized, which seriously affects the ecological environment. Based on this, the present application provides a complete set of equipment for recycling green mud for papermaking, which uses pure water washing to recover the useful component sodium carbonate salt in the green mud for papermaking, and the residue is then deflocculated and screened and returned to the papermaking process as papermaking filler for recycling, so that the green mud for papermaking can be turned into treasure. Utility Model Content

[0008] The utility model aims to solve the technical problems existing in the prior art. To this end, the utility model provides a complete set of equipment for recycling green mud for papermaking, which uses pure water to wash and recover the useful component sodium carbonate salt in the green mud for papermaking, and the residue is then processed by deflocculation and screening to be returned to the papermaking process for recycling as papermaking filler, so that the green mud for papermaking can be turned into treasure.

[0009] The technical solution adopted by the utility model to solve its technical problems is:

[0010] Provided is a complete set of equipment for recycling and treating green mud in papermaking, comprising a water washing tank, a concentrator, a deflocculator, a screening machine and a material receiving tank which are connected in sequence through pipelines, wherein the water washing tank is used to receive and dilute the green mud, the concentrator is used to separate washing water and material residue of the green mud, the deflocculator is used to grind the material residue, the screening machine is used to screen the material residue, the material receiving tank is used to store the material residue, and the material receiving tank is connected to a papermaking workshop to transport the material residue to the papermaking workshop as papermaking filler; the invention also comprises a concentrated water tank and a spray drying tower, wherein the concentrated water tank is used to receive washing water from the concentrator, and the spray drying tower is used to evaporate and crystallize the washing water to form sodium carbonate salt from the washing water.

[0011] In a preferred embodiment, the high-temperature gas source of the spray drying tower is taken from the high-temperature flue gas in the flue of the boiler.

[0012] In a preferred embodiment, the concentrated water tank is also provided with an overflow pipe, and the overflow pipe is connected to the water washing tank.

[0013] In a preferred embodiment, a return pipe is further provided on the pumping pipe between the water washing tank and the concentrator, and the return pipe is connected to the washing water pipe of the water washing tank. Valve 1 and valve 2 are respectively provided on the pumping pipe and the return pipe.

[0014] In a preferred embodiment, the deflocculating machine, the screening machine and the material receiving trough are each provided with two units, namely a first deflocculating machine, a second deflocculating machine, a first screening machine, a second screening machine, a first material receiving trough and a second material receiving trough. The first deflocculating machine, the first screening machine, the first material receiving trough, the second deflocculating machine, the second screening machine and the second material receiving trough are connected in sequence, wherein the screened material of the first screening machine is returned to the first deflocculating machine, and the screened material of the second screening machine is returned to the second deflocculating machine.

[0015] In a preferred embodiment, a clean water pipe is further provided on the pipeline between the thickener and the first deflocculator, and the clean water pipe is arranged on the pipeline at the feed end of the slurry pump.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model uses pure water to wash papermaking green mud, uses a concentrator to separate the washing water from the residue, the washing water is evaporated and crystallized through a spray drying tower to form a sodium carbonate salt product, and the residue is returned to the papermaking process for recycling as papermaking filler after grinding and screening, thereby turning papermaking green mud into treasure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1 This is a schematic diagram of the structure of a complete set of equipment for recycling and treating papermaking green mud provided by the utility model;

[0019] Figure 2 The utility model discloses a process flow chart of a complete set of equipment for recycling and treating green mud from papermaking.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1—water washing tank, 2—thickener, 3—first deflocculator, 4—first sieving machine, 5—first receiving tank, 6—second deflocculator, 7—second sieving machine, 8—second receiving tank, 9—concentrated water tank, 10—spray drying tower, 11—flue, 12—overflow pipe, 13—clean water pipe, 14—return pipe, 15—wash water pipeline, 16—valve one, 17—valve two. DETAILED DESCRIPTION

[0022] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific position, be constructed and operate in a specific position, and therefore should not be understood as limiting the present invention;

[0025] In addition, the descriptions involving the terms "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. The terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] Embodiment 1

[0028] Please refer to the instruction manual Figure 1 A complete set of equipment for recycling and treating papermaking green mud includes a water washing tank 1, a concentrator 2, a deflocculator, a screening machine, a material receiving tank, a concentrated water tank 9 and a spray drying tower 10. The water washing tank 1, the concentrator 2, the deflocculator, the screening machine and the material receiving tank are connected in sequence through pipelines. The water inlet end of the concentrated water tank 9 is connected to the washing water outlet of the concentrator 2, and the water outlet end is connected to the spray drying tower 10.

[0029] Specifically, the water washing tank 1 is used to receive and dilute the green mud, the concentrator 2 is used to separate the washing water and the residue of the green mud, the deflocculator is used to grind the residue, the screening machine is used to screen the residue, the receiving tank is used to store the residue, and the receiving tank is connected to the papermaking workshop to send the residue to the papermaking workshop as papermaking filler; the concentrated water tank 9 is used to receive the washing water of the concentrator, and the spray drying tower 10 is used to evaporate and crystallize the washing water to form sodium carbonate salt.

[0030] Preferably, the high-temperature gas source of the spray drying tower 10 is taken from the high-temperature flue gas in the flue 11 of the boiler, so as to recover the heat energy of the flue gas and save energy.

[0031] Preferably, the concentrated water tank 9 is also provided with an overflow pipe 12, and the overflow pipe 12 is connected to the water washing tank 1. This design can overflow the excess washing water into the water washing tank for reuse.

[0032] Preferably, as attached Figure 1As shown, the deflocculating machine, the screening machine and the material receiving trough are each provided with two, namely the first deflocculating machine 3, the second deflocculating machine 6, the first screening machine 4, the second screening machine 7, the first material receiving trough 5 and the second material receiving trough 8. The first deflocculating machine 3, the first screening machine 4, the first material receiving trough 5, the second deflocculating machine 6, the second screening machine 7 and the second material receiving trough 8 are sequentially connected, wherein the screened material of the first screening machine 4 is returned to the first deflocculating machine 3, and the screened material of the second screening machine 7 is returned to the second deflocculating machine 6. In this embodiment, the material residue is firstly coarsely ground and coarsely screened, and then finely ground and finely screened, so that the fiber of the material residue meets the requirements of papermaking filler.

[0033] Preferably, a clean water pipe 13 is further provided on the pipeline between the thickener 2 and the first deflocculator 3, and the clean water pipe 13 is provided on the pipeline at the feed end of the slag slurry pump. This design can use clean water to form a suspension of the slag discharged from the thickener, which is conducive to the pumping of the slag.

[0034] The process flow of the complete set of equipment for recycling and treating papermaking green mud is as shown in the attached figure. Figure 2 As shown, pure water is used to wash papermaking green mud, and a concentrator is used to separate the wash water and the residue. The wash water is evaporated and crystallized through a spray drying tower to form a sodium carbonate salt product. The residue is ground and screened and returned to the papermaking process for recycling as papermaking filler, thus turning papermaking green mud into treasure.

[0035] Embodiment 2

[0036] Based on the first embodiment, as shown in the attached Figure 1 As shown, in this embodiment, a return pipe 14 is further provided on the pumping pipe between the water washing tank 1 and the concentrator 2, and the return pipe 14 is connected to the washing water pipe 15 of the water washing tank 1. The pumping pipe and the return pipe 14 are respectively provided with a valve 16 and a valve 2 17. In this embodiment, by controlling the valve 1 and the valve 2, the green mud in the water washing tank can form an internal circulation during the dilution and stirring process through the return pipe to ensure the dilution effect; on the other hand, the washing water can also enter the concentrator through the return pipe and can be used to clean the concentrator.

[0037] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A complete set of equipment for recycling and treating green mud from papermaking, characterized in that: It comprises a washing tank, a thickener, a deflocculator, a screening machine and a material receiving tank which are connected in sequence through pipelines, wherein the washing tank is used to receive and dilute the green mud, the thickener is used to wash the green mud and separate the material residue, the deflocculator is used to grind the material residue, the screening machine is used to screen the material residue, the material receiving tank is used to store the material residue, and the material receiving tank is connected to the papermaking workshop to deliver the material residue to the papermaking workshop as papermaking filler; It also includes a concentrated water tank and a spray drying tower. The concentrated water tank is used to receive the washing water of the concentrator, and the spray drying tower is used to evaporate and crystallize the washing water to form sodium carbonate salt.

2. The complete equipment for recycling green mud from papermaking according to claim 1, characterized in that: The high-temperature gas source of the spray drying tower is taken from the high-temperature flue gas in the flue of the boiler.

3. The complete equipment for recycling and treating papermaking green mud according to claim 1, characterized in that: The concentrated water tank is also provided with an overflow pipe, and the overflow pipe is connected to the water washing tank.

4. The complete equipment for recycling and treating papermaking green mud according to claim 1, characterized in that: A return pipe is also provided on the pumping pipe between the water washing tank and the concentrator, and the return pipe is connected to the washing water pipe of the water washing tank. A valve 1 and a valve 2 are respectively provided on the pumping pipe and the return pipe.

5. The complete set of equipment for recycling green mud for papermaking according to any one of claims 1 to 4, characterized in that: The deflocculating machine, the screening machine and the material receiving trough are each provided with two, namely the first deflocculating machine, the second deflocculating machine, the first screening machine, the second screening machine, the first material receiving trough and the second material receiving trough. The first deflocculating machine, the first screening machine, the first material receiving trough, the second deflocculating machine, the second screening machine and the second material receiving trough are connected in sequence, wherein the screened material of the first screening machine is returned to the first deflocculating machine, and the screened material of the second screening machine is returned to the second deflocculating machine.

6. The complete equipment for recycling green mud from papermaking according to claim 5, characterized in that: A clean water pipe is also provided on the pipeline between the thickener and the first deflocculator. The clean water pipe is arranged on the pipeline at the feed end of the slurry pump.

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