Core layer pulp line and slag removal equipment for coated whiteboard with grey back
By using the combination scheme of two sets of thick residue and a set of thick residue in one set of two groups in the core layer slurry of the gray -floor whiteboard paper, it solves the less residue and residue effect in the existing technologies. The problem of poorness achieves more efficient slag removal effects and lower production costs.
Patent Information
- Application Number
- CN202421244081.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-06-03
AI Technical Summary
In the core slurry line of existing coated gray-bottomed white board paper, the two groups of medium-concentrated slag removal methods respectively result in less slag discharge, poor slag removal effect, large equipment vibration, high failure rate and high production costs.
Adopt a combination scheme of two sets of thick residue device and a set of thick residue in one set of two sections, and send a good pulp to the medium thick residue processing through a section of the pulp pump. The tail paste is sent to the medium thick residue can, and the second section of the pulp pump will send the tail paste after the residue to the second section of the thick residue device.
It improves the scum removal effect and the cleanliness of the slurry, reduces the amount and failure rate of equipment, and reduces production costs and power consumption.
Smart Images
Figure CN222412419U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of papermaking, and in particular to a core layer pulp line and slag removal equipment for coating grey-bottom white board paper. Background Art
[0002] See also Figure 1 and Figure 2 In the core pulp line of coated grey-bottom white board with a daily output of 1,600 tons, there are two groups of medium-consistency cleaners, each of which is divided into two sections. The good pulp treated by the first-stage medium-consistency cleaner is sent to the grading screen for pulping. The tailings are sent to the corresponding second-stage medium-consistency cleaners for treatment, and the good pulp is sent back to the first-stage pulping pump, and the sand of the tailings is discharged to the slag lifter.
[0003] However, this method of removing slag separately by two sets of medium-consistency cleaners leads to the following problems:
[0004] 1. The flow rate of a single group of slurry is small, the pressure difference is low, the slag discharge is small, and the slag removal effect is poor;
[0005] 2. The flow rate of a single group is small, the equipment is not full of pipes, resulting in large vibration and high failure rate;
[0006] 3. The equipment is used more frequently. The two stages share two slurry pumps and four slag removers, which increases production costs. Utility Model Content
[0007] In view of the above problems, the present application provides a core layer pulp line and slag removal equipment for coating grey-backed white board paper, which solves the problems of insufficient slag discharge and poor slag removal effect in the existing core layer pulp line for coating grey-backed white board paper, which uses two groups of medium-consistency slag removers to remove slag separately.
[0008] To achieve the above object, the inventor provides a slag removal device for a core layer pulp line for coating grey-backed white board paper, comprising:
[0009] Two sets of first-stage medium-consistency cleaners, wherein the first-stage medium-consistency cleaner is used to remove the slag from the good pulp fed into the grading screen, and to feed the ungenerated tail pulp into the corresponding medium-consistency slag collecting tank;
[0010] Two groups of first-stage slurry feed pumps, the two groups of first-stage slurry feed pumps correspond to the two groups of first-stage medium-consistency cleaners one by one, and the first-stage slurry feed pumps are used to feed the good slurry to be processed into the corresponding first-stage medium-consistency cleaner;
[0011] Two groups of medium-concentration slag collecting tanks, the two groups of medium-concentration slag collecting tanks correspond to the two groups of first-stage medium-concentration slag removers one by one, and the medium-concentration slag collecting tanks are used to collect tailings generated by the corresponding first-stage medium-concentration slag removers;
[0012] A second-stage slurry feed pump, which is used to feed the tail slurry in the two groups of medium-concentration slag collection tanks into the second-stage medium-concentration slag remover;
[0013] The second-stage medium-consistency cleaner is used to process the tailings to obtain good slurry and send it to the first-stage medium-consistency cleaner.
[0014] In some embodiments, it also includes:
[0015] A slag lifter, wherein the slag inlet of the slag lifter is connected to the slag discharge port of the medium-concentration slag collecting tank and the slag discharge port of the second-stage medium-concentration slag remover.
[0016] In some embodiments, the two groups of medium-concentration slag collection tanks are connected to the second-stage medium-concentration slag remover through the same second-stage slurry feed pump.
[0017] In some embodiments, each of the two groups of one-stage medium-consistency cleaners includes five medium-consistency cleaners.
[0018] In some embodiments, there are two second-stage medium-concentration cleaners.
[0019] Another technical solution is provided, a core layer pulp line for coating grey-bottom white board paper, comprising a slag removal device, the slag removal device comprising:
[0020] Two sets of first-stage medium-consistency cleaners, wherein the first-stage medium-consistency cleaner is used to remove the slag from the good pulp fed into the grading screen, and to feed the ungenerated tail pulp into the corresponding medium-consistency slag collecting tank;
[0021] Two groups of first-stage slurry feed pumps, the two groups of first-stage slurry feed pumps correspond to the two groups of first-stage medium-consistency cleaners one by one, and the first-stage slurry feed pumps are used to feed the good slurry to be processed into the corresponding first-stage medium-consistency cleaner;
[0022] Two groups of medium-concentration slag collecting tanks, the two groups of medium-concentration slag collecting tanks correspond to the two groups of first-stage medium-concentration slag removers one by one, and the medium-concentration slag collecting tanks are used to collect tailings generated by the corresponding first-stage medium-concentration slag removers;
[0023] A second-stage slurry feed pump, which is used to feed the tail slurry in the two groups of medium-concentration slag collection tanks into the second-stage medium-concentration slag remover;
[0024] The second-stage medium-consistency cleaner is used to process the tailings to obtain good slurry and send it to the first-stage medium-consistency cleaner.
[0025] In some embodiments, it also includes:
[0026] A slag lifter, wherein the slag inlet of the slag lifter is connected to the slag discharge port of the medium-concentration slag collecting tank and the slag discharge port of the second-stage medium-concentration slag remover.
[0027] In some embodiments, the two groups of medium-concentration slag collection tanks are connected to the second-stage medium-concentration slag remover through the same second-stage slurry feed pump.
[0028] In some embodiments, each of the two groups of one-stage medium-consistency cleaners includes five medium-consistency cleaners.
[0029] In some embodiments, there are two second-stage medium-concentration cleaners.
[0030] Different from the prior art, the above technical scheme uses two groups of first-stage slurry feed pumps to respectively send the good slurry to be processed into the corresponding first-stage medium-consistency cleaner for processing, and then the good slurry treated by the two groups of first-stage medium-consistency cleaners are respectively sent to the grading screen for subsequent processing, and then the tail slurry of the two groups of first-stage medium-consistency cleaners is sent to the corresponding medium-consistency slag collecting tank for processing, and the tail slurry after slag collection in the two groups of medium-consistency slag collecting tanks is sent to the second-stage medium-consistency cleaner for processing through the second-stage slurry feed pump, and the treated good slurry is then sent to one of the first-stage medium-consistency cleaners for processing. By using two groups of first-stage medium-consistency cleaners to share one group of second-stage medium-consistency cleaners, the slurry feed pressure of the second-stage medium-consistency cleaner becomes larger, the slag removal effect is improved, and then the cleanliness of the slurry is improved; at the same time, the second-stage medium-consistency cleaner is reduced, which saves power consumption and production costs, and at the same time reduces the use of equipment, reduces equipment failure rate, and reduces equipment maintenance costs.
[0031] The above-mentioned records related to the content of the utility model are only an overview of the technical solution of the present application. In order to enable ordinary technicians in the field to more clearly understand the technical solution of the present application, and then implement it according to the text of the specification and the contents recorded in the drawings, and to make the above-mentioned purpose and other purposes, features and advantages of the present application easier to understand, the following is an explanation in combination with the specific implementation method and drawings of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The drawings are only used to illustrate the principles, implementation methods, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and shall not be considered as limitations of the present application.
[0033] In the drawings of the specification:
[0034] Figure 1 A schematic diagram of a process flow of a core layer pulp line for coating grey-bottom white board paper described in the background technology;
[0035] Figure 2 A schematic diagram of a flow chart of the existing slag removal equipment described in the background technology;
[0036] Figure 3 A structural schematic diagram of a slag removal device for a core layer pulp line for coating grey-bottom white board paper according to a specific implementation method;
[0037] Figure 4 The present invention is a schematic flow chart of a core layer pulp line for coating grey-backed white board paper according to a specific implementation method.
[0038] The reference numerals in the above drawings are described as follows:
[0039] 110. One-stage medium-consistency cleaner,
[0040] 120, a first stage slurry pump;
[0041] 130. Medium concentration slag collecting tank;
[0042] 140. Two-stage slurry pump;
[0043] 150. Second stage medium-density slag remover;
[0044] 160. Slag lifting machine. DETAILED DESCRIPTION
[0045] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0046] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0047] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0048] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.
[0049] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0050] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.
[0051] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.
[0052] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0053] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0054] See also Figure 3 This embodiment provides a slag removal device for a core layer pulp line for coating gray-bottom white board paper, comprising:
[0055] Two sets of first-stage medium-consistency cleaners 110, wherein the first-stage medium-consistency cleaners 110 are used to remove the slag from the good pulp before sending it to the grading screen, and to send the unproduced tailings to the corresponding medium-consistency slag collecting tank 130;
[0056] Two groups of first-stage slurry feed pumps 120, the two groups of first-stage slurry feed pumps 120 correspond to the two groups of first-stage medium-consistency cleaners 110 one by one, and the first-stage slurry feed pumps 120 are used to feed the good slurry to be processed into the corresponding first-stage medium-consistency cleaners 110;
[0057] Two groups of medium-concentration slag collecting tanks 130, the two groups of medium-concentration slag collecting tanks 130 correspond to the two groups of first-stage medium-concentration slag removers 110 one by one, and the medium-concentration slag collecting tanks 130 are used to collect tailings generated by the corresponding first-stage medium-concentration slag removers 110;
[0058] A second-stage slurry feed pump 140, which is used to feed the tail slurry in the two groups of medium-concentration slag collection tanks 130 into the second-stage medium-concentration slag remover 150;
[0059] The second-stage medium-consistency cleaner 150 is used to process the tailings to obtain good slurry which is then sent to the first-stage medium-consistency cleaner 110 .
[0060] See also Figure 4 The good pulp to be processed is respectively sent to the corresponding first-stage medium-consistency cleaner 110 for processing by two sets of first-stage slurry pumps 120, and then the good pulp processed by the two sets of first-stage medium-consistency cleaners 110 is respectively sent to the grading screen for subsequent processing, and then the tail pulp of the two sets of first-stage medium-consistency cleaners 110 is sent to the corresponding medium-consistency slag collection tank 130 for processing, and the tail pulp after slag collection in the two sets of medium-consistency slag collection tanks 130 is sent to the second-stage medium-consistency cleaner 150 for processing by the second-stage slurry pump 140 The good pulp obtained by the treatment is then sent to one of the groups of first-stage medium-consistency cleaners 110 for treatment. The two groups of first-stage medium-consistency cleaners 110 share one group of second-stage medium-consistency cleaners 150, so that the pulp inlet pressure of the second-stage medium-consistency cleaners 150 becomes larger, the deslagging effect is improved, and then the cleanliness of the pulp is improved; at the same time, the second-stage medium-consistency cleaners 150 are reduced, saving electricity consumption and production costs, while reducing the use of equipment, reducing equipment failure rate and equipment maintenance costs.
[0061] In some embodiments, it also includes:
[0062] The slag extractor 160 has a slag inlet connected to the slag discharge port of the medium-concentration slag collecting tank 130 and the slag discharge port of the second-stage medium-concentration slag remover 150 .
[0063] The sand produced by the medium-concentration slag collecting tank 130 and the second-stage medium-concentration slag remover 150 is discharged through the slag lifter 160
[0064] In some embodiments, the two groups of medium-concentration slag collection tanks 130 are connected to the second-stage medium-concentration slag remover 150 through the same second-stage slurry feed pump 140 .
[0065] In order to further increase the slurry inlet pressure of the second-stage medium-concentration slag remover 150, the two groups of medium-concentration slag collection tanks 130 send the tailings slurry into the second-stage medium-concentration slag remover 150 through the same second-stage slurry inlet pump 140. In other embodiments, two groups of second-stage slurry inlet pumps 140 may be used to correspond to the two groups of medium-concentration slag collection tanks 130, respectively, and the tailings slurry in the corresponding medium-concentration slag collection tanks 130 may be sent into the second-stage medium-concentration slag remover 150 for processing through the two groups of second-stage slurry inlet pumps 140.
[0066] In some embodiments, each of the two groups of first-stage medium-consistency cleaners 110 includes five medium-consistency cleaners. Each group of first-stage medium-consistency cleaners 110 includes five medium-consistency cleaners for processing the sent good pulp, and then the tail pulp generated by the five medium-consistency cleaners is sent to the corresponding medium-consistency slag collecting tank 130 for processing. In other embodiments, each group of first-stage medium-consistency cleaners 110 may use other numbers of medium-consistency cleaners, such as four or six.
[0067] In some embodiments, there are two second-stage medium-consistency cleaners 150. Two second-stage medium-consistency cleaners 150 can ensure that the pressure of the slurry inlet is large enough and the efficiency of tailings slurry treatment is guaranteed. In other embodiments, the second-stage medium-consistency cleaner 150 can also use other numbers of medium-consistency cleaners, such as three or one.
[0068] By adopting the deslagging equipment in the present application, the two-stage medium-consistency deslagging devices 150 in OCC (core pulp line for coating gray-bottom white paperboard) are combined, and the tail pulp of two groups of the first stage is combined before the second stage pump, and only one group of the second-stage medium-consistency deslagging devices 150 is used. One feed pump and two second-stage medium-consistency deslagging devices are used less, and the feed pressure is increased from about 260kpa to about 310kap, and the pressure difference is increased from the original 40-60kp to the current 120-160kp. The deslagging effect is better, and the deslagging is increased from the original average of 2-3 buckets per day to the current 5-6 buckets, which improves the cleanliness of the finished pulp. A feed pump with a power of 132 kilowatts is stopped, and the power of the two feed pumps before the stop is about 65%. Now only one unit is in use with a load of 85%, which can save 45% of the load of a single unit, that is, electricity can be saved every day (132*0.45*24=1425 kWh / day). If the unit is turned on for 300 days a year and calculated at 0.6 yuan per kWh, the electricity cost can be saved by 1425*300*0.6=256,500 yuan per year.
[0069] In another embodiment, a core layer pulp line for coating gray-backed white board paper includes a slag removal device, see Figure 3 , the slag removal equipment comprises:
[0070] Two sets of first-stage medium-consistency cleaners 110, wherein the first-stage medium-consistency cleaners 110 are used to remove the slag from the good pulp before sending it to the grading screen, and to send the unproduced tailings to the corresponding medium-consistency slag collecting tank 130;
[0071] Two groups of first-stage slurry feed pumps 120, the two groups of first-stage slurry feed pumps 120 correspond to the two groups of first-stage medium-consistency cleaners 110 one by one, and the first-stage slurry feed pumps 120 are used to feed the good slurry to be processed into the corresponding first-stage medium-consistency cleaners 110;
[0072] Two groups of medium-concentration slag collecting tanks 130, the two groups of medium-concentration slag collecting tanks 130 correspond to the two groups of first-stage medium-concentration slag removers 110 one by one, and the medium-concentration slag collecting tanks 130 are used to collect tailings generated by the corresponding first-stage medium-concentration slag removers 110;
[0073] A second-stage slurry feed pump 140, which is used to feed the tail slurry in the two groups of medium-concentration slag collection tanks 130 into the second-stage medium-concentration slag remover 150;
[0074] The second-stage medium-consistency cleaner 150 is used to process the tailings to obtain good slurry which is then sent to the first-stage medium-consistency cleaner 110 .
[0075] See also Figure 4 The good pulp to be processed is respectively sent to the corresponding first-stage medium-consistency cleaner 110 for processing by two sets of first-stage slurry pumps 120, and then the good pulp processed by the two sets of first-stage medium-consistency cleaners 110 is respectively sent to the grading screen for subsequent processing, and then the tail pulp of the two sets of first-stage medium-consistency cleaners 110 is sent to the corresponding medium-consistency slag collection tank 130 for processing, and the tail pulp after slag collection in the two sets of medium-consistency slag collection tanks 130 is sent to the second-stage medium-consistency cleaner 150 for processing by the second-stage slurry pump 140 The good pulp obtained by the treatment is then sent to one of the groups of first-stage medium-consistency cleaners 110 for treatment. The two groups of first-stage medium-consistency cleaners 110 share one group of second-stage medium-consistency cleaners 150, so that the pulp inlet pressure of the second-stage medium-consistency cleaners 150 becomes larger, the deslagging effect is improved, and then the cleanliness of the pulp is improved; at the same time, the second-stage medium-consistency cleaners 150 are reduced, saving electricity consumption and production costs, while reducing the use of equipment, reducing equipment failure rate and equipment maintenance costs.
[0076] In some embodiments, it also includes:
[0077] The slag extractor 160 has a slag inlet connected to the slag discharge port of the medium-concentration slag collecting tank 130 and the slag discharge port of the second-stage medium-concentration slag remover 150 .
[0078] The sand produced by the medium-concentration slag collecting tank 130 and the second-stage medium-concentration slag remover 150 is discharged through the slag lifter 160
[0079] In some embodiments, the two groups of medium-concentration slag collection tanks 130 are connected to the second-stage medium-concentration slag remover 150 through the same second-stage slurry feed pump 140 .
[0080] In order to further increase the slurry inlet pressure of the second-stage medium-concentration slag remover 150, the two groups of medium-concentration slag collection tanks 130 send the tailings slurry into the second-stage medium-concentration slag remover 150 through the same second-stage slurry inlet pump 140. In other embodiments, two groups of second-stage slurry inlet pumps 140 may be used to correspond to the two groups of medium-concentration slag collection tanks 130, respectively, and the tailings slurry in the corresponding medium-concentration slag collection tanks 130 may be sent into the second-stage medium-concentration slag remover 150 for processing through the two groups of second-stage slurry inlet pumps 140.
[0081] In some embodiments, each of the two groups of first-stage medium-consistency cleaners 110 includes five medium-consistency cleaners. Each group of first-stage medium-consistency cleaners 110 includes five medium-consistency cleaners for processing the sent good pulp, and then the tail pulp generated by the five medium-consistency cleaners is sent to the corresponding medium-consistency slag collecting tank 130 for processing. In other embodiments, each group of first-stage medium-consistency cleaners 110 may use other numbers of medium-consistency cleaners, such as four or six.
[0082] In some embodiments, there are two second-stage medium-consistency cleaners 150. Two second-stage medium-consistency cleaners 150 can ensure that the pressure of the slurry inlet is large enough and the efficiency of tailings slurry treatment is guaranteed. In other embodiments, the second-stage medium-consistency cleaner 150 can also use other numbers of medium-consistency cleaners, such as three or one.
[0083] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.
Claims
1. A slag removal device for a core layer pulp line for coating grey-backed white board paper, characterized in that: include: Two sets of first-stage medium-consistency cleaners, wherein the first-stage medium-consistency cleaner is used to remove the slag from the good pulp fed into the grading screen, and to feed the ungenerated tail pulp into the corresponding medium-consistency slag collecting tank; Two groups of first-stage slurry feed pumps, the two groups of first-stage slurry feed pumps correspond to the two groups of first-stage medium-consistency cleaners one by one, and the first-stage slurry feed pumps are used to feed the good slurry to be processed into the corresponding first-stage medium-consistency cleaner; Two groups of medium-concentration slag collecting tanks, the two groups of medium-concentration slag collecting tanks correspond to the two groups of first-stage medium-concentration slag removers one by one, and the medium-concentration slag collecting tanks are used to collect tailings generated by the corresponding first-stage medium-concentration slag removers; A second-stage slurry feed pump, which is used to feed the tail slurry in the two groups of medium-concentration slag collection tanks into the second-stage medium-concentration slag remover; The second-stage medium-consistency cleaner is used to process the tailings to obtain good slurry which is then sent to the first-stage medium-consistency cleaner.
2. The slag removal equipment for the core layer pulp line of gray-backed white board paper according to claim 1, characterized in that: Also includes: A slag lifter, wherein the slag inlet of the slag lifter is connected to the slag discharge port of the medium-concentration slag collecting tank and the slag discharge port of the second-stage medium-concentration slag remover.
3. The slag removal equipment for the core layer pulp line of gray-backed white board paper according to claim 1, characterized in that: The two groups of medium-concentration slag collecting tanks are connected to the second-stage medium-concentration slag remover through the same second-stage slurry feed pump.
4. The slag removal equipment for the core layer pulp line of gray-backed white board paper according to claim 1, characterized in that: Each of the two groups of one-stage medium-consistency cleaners includes five medium-consistency cleaners.
5. The slag removal equipment for the core layer pulp line of gray-backed white board paper according to claim 1, characterized in that: There are two second-stage medium-concentration slag removers.
6. A core layer pulp line for coating grey-backed white board paper, comprising a slag removal device, characterized in that: The slag removal equipment comprises: Two sets of first-stage medium-consistency cleaners, wherein the first-stage medium-consistency cleaner is used to remove the slag from the good pulp fed into the grading screen, and to feed the ungenerated tail pulp into the corresponding medium-consistency slag collecting tank; Two groups of first-stage slurry feed pumps, the two groups of first-stage slurry feed pumps correspond to the two groups of first-stage medium-consistency cleaners one by one, and the first-stage slurry feed pumps are used to feed the good slurry to be processed into the corresponding first-stage medium-consistency cleaner; Two groups of medium-concentration slag collecting tanks, the two groups of medium-concentration slag collecting tanks correspond to the two groups of first-stage medium-concentration slag removers one by one, and the medium-concentration slag collecting tanks are used to collect tailings generated by the corresponding first-stage medium-concentration slag removers; A second-stage slurry feed pump, which is used to feed the tail slurry in the two groups of medium-concentration slag collection tanks into the second-stage medium-concentration slag remover; The second-stage medium-consistency cleaner is used to process the tailings to obtain good slurry and send it to the first-stage medium-consistency cleaner.
7. The core layer pulp line for coating grey-backed white board paper according to claim 6, characterized in that: Also includes: A slag lifter, wherein the slag inlet of the slag lifter is connected to the slag discharge port of the medium-concentration slag collecting tank and the slag discharge port of the second-stage medium-concentration slag remover.
8. The core layer pulp line for coating grey-backed white board paper according to claim 6, characterized in that: The two groups of medium-concentration slag collecting tanks are connected to the second-stage medium-concentration slag remover through the same second-stage slurry feed pump.
9. The core layer pulp line for coating grey-backed white board paper according to claim 6, characterized in that: Each of the two groups of one-stage medium-consistency cleaners includes five medium-consistency cleaners.
10. The core layer pulp line for coating grey-backed white board paper according to claim 6, characterized in that: There are two second-stage medium-concentration slag removers.