Material preparation system and method of high-concentration pulping machine

Abstract

The invention relates to a material preparation system for a high-concentration refiner, in which the device for pulping a pulp package is a drum pulper which outputs pulp suitable for the feed concentration of the high-concentration refiner, and a heavy impurity removal device is arranged upstream of the drum pulper. The invention also relates to a material preparation method of the high-concentration pulping machine, which comprises the following steps: preparing a pulp bag, and removing heavy impurities; a drum pulper is used for pulping the pulp bag, and pulp with the feeding concentration suitable for the high-concentration pulping machine is output; and the pulp output by the drum pulper is supplied to the high-concentration pulping machine. The invention further relates to a material preparation system of the high-concentration pulping machine, the device for pulping the pulp bag is the intermittent high-concentration pulping machine, the buffer tank and the screw conveyor with the dewatering function are arranged on the downstream portion of the intermittent high-concentration pulping machine, and the screw conveyor is used for concentrating pulp to the feeding concentration of the high-concentration pulping machine. The invention further relates to a material preparation method of the high-concentration pulping machine.

Description

Technical Field

[0001] The invention relates to a material preparation system and method for a high-concentration refiner. Background Art

[0002] High-consistency pulping is a pulping process widely used in the paper industry. Although it was and is mainly used for kraft pulp, the advantages of high-consistency pulping have recently been applied to hardwood, coniferous or non-wood fiber pulp, especially for the production of toilet paper. In the pulping process using a high-consistency refiner, the pulp is usually pulped in a low-consistency pulper and discharged at a concentration of 3% to 6%. Some heavy impurities (broken wire or even small stones mixed during storage) in the resulting pulp with a concentration of about 4% are removed by a liquid cyclone separator. Then, the pulp concentration is increased to 15% to 45% by pulp concentration equipment (such as a twin-wire pulping machine, a pressing screw, etc.), and at this concentration, the pulp is fed into a high-consistency refiner by a screw feed for pulping under high-concentration conditions. This process using the prior art requires low-consistency preparation first, heavy impurities removal (liquid cyclone separator) and then concentration to the required concentration, and the investment cost of the pulp concentration equipment is relatively high.

[0003] Chinese invention patent CN103603222A discloses a production process for making molded plates from waste paper, boards and waste plastics, which undergoes purification pretreatment before pulping. However, the pulp obtained by pulping is still concentrated to a concentration of 4.0±0.5% before entering the coarse pulp pool, and then the pulp is sent to the pulper for grinding through a pulp pump. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a stock preparation system and method for a high-consistency refiner, so as to eliminate the use of pulp thickening equipment during the stock preparation process.

[0005] According to a first aspect of the present invention, a material preparation system for a high-consistency refiner is provided, which is used to break up pulp bales and provide pulp for the high-consistency refiner. The device for breaking up pulp bales is a drum pulper, and its operation mode can be continuous feeding, continuous discharging or intermittent feeding, intermittent discharging. The drum pulper outputs pulp of a feed concentration suitable for the high-consistency refiner.

[0006] Preferably, a heavy impurity removal device is arranged upstream of the drum pulper, and the heavy impurity removal device loosens the pulp bales and removes impurities in a dry process.

[0007] The feed concentration suitable for high-concentration refiners is generally in the range of 15% to 45%, and the preferred feed concentration is around 24% to 28%.

[0008] When using a drum pulper in the prior art, the pulp must be diluted to a low concentration during or after pulping before proceeding to the next step. For example, Chinese invention patent CN112746513A discloses a dilution water adding device and a drum pulper with the dilution water adding device, which has a pulping section and a screening section, and the pulp can reach a concentration of 30% in the pulping section, but the pulp leaves the pulping section with a concentration of less than 5%.

[0009] The inventors of the present invention have found that the drum pulper can output pulp that meets the concentration requirements of the high-concentration refiner. Furthermore, the inventors of the present invention have changed the traditional use of the drum pulper, allowing the drum pulper to directly output high-concentration pulp for the high-concentration refiner; accordingly, a heavy impurity removal device is arranged upstream of the drum pulper to remove heavy impurities.

[0010] Alternatively, the output of the drum pulper is fed directly to the feed screw of a high consistency refiner.

[0011] Optionally, a buffer tank is provided downstream of the drum pulper, and pulp output from the drum pulper is provided to the buffer tank, which collects the pulp and directly provides the pulp to the feeding screw of the high-consistency refiner through a self-contained conveying screw located at the bottom of the buffer tank.

[0012] Optionally, a screw conveyor is arranged downstream of the drum pulper, and pulp output from the drum pulper is provided to the screw conveyor, which is designed to be suitable for providing pulp with uniform concentration and volume flow to a feeding screw of a high-consistency refiner through frequency conversion control.

[0013] Further optionally, the screw conveyor is designed to have a dewatering function, and is suitable for further concentrating the pulp received from the drum pulper to the feeding concentration of the high-consistency refiner during the conveying process and conveying it to the feeding screw of the high-consistency refiner.

[0014] Optionally, there are a buffer tank and a screw conveyor downstream of the drum pulper, the pulp output from the drum pulper is provided to the buffer tank, the buffer tank collects the pulp and provides it to the screw conveyor, and the screw conveyor is designed to be suitable for providing the pulp to a feeding screw of a high-concentration refiner with uniform concentration and volume flow through variable frequency control.

[0015] Further optionally, the screw conveyor is designed to have a dewatering function, and is suitable for further concentrating the pulp received from the drum pulper to the feeding concentration of the high-consistency refiner during the conveying process and conveying it to the feeding screw of the high-consistency refiner.

[0016] The screw conveyor is a conveying device. Even if it has a dewatering function, it does not mean that the screw conveyor can be used as a thickening device. The pulp output by the drum pulper is suitable for refining in a high-concentration refiner. The dewatering function of the screw conveyor is only to further make the pulp concentration close to or reach the preferred feeding concentration.

[0017] Optionally, the heavy impurity removing device comprises a rotating drum with holes, the rotating drum being designed to enable the pulp pack to be dispersed and moved forward as the rotating drum rotates, and the heavy impurities to be screened out from the holes during the rotation.

[0018] Optionally, the stock preparation system further comprises a thick pulp screen arranged downstream of the high-consistency refiner, and the tailings obtained by passing through the thick pulp screen after the pulp output from the high-consistency refiner is diluted are provided to the inlet of the drum pulper directly or after being concentrated.

[0019] According to a second aspect of the present invention, a material preparation system for a high-concentration pulper is provided, which is used to break up pulp bags and provide pulp for the high-concentration pulper, wherein the device for breaking up pulp bags in the material preparation system for the high-concentration pulper is an intermittent high-concentration pulper, and a buffer tank and a screw conveyor are provided downstream of the intermittent high-concentration pulper, the pulp output by the intermittent high-concentration pulper is provided to the buffer tank, the buffer tank collects the pulp and provides the pulp to the screw conveyor, wherein the screw conveyor is designed to have a dewatering function, suitable for concentrating the received pulp output by the intermittent high-concentration pulper to the feed concentration of the high-concentration pulper during the transportation process and conveying it to the feeding screw of the high-concentration pulper with uniform concentration and volume flow rate through frequency conversion control. The working concentration of the above-mentioned intermittent high-concentration pulper is 10-20%, preferably 12-17%, and the output pulp is concentrated to about 25% after dehydration, so as to be suitable for providing to the high-concentration pulper.

[0020] Preferably, a heavy impurity removal device is arranged upstream of the intermittent high-consistency pulper to remove heavy impurities, wherein the heavy impurity removal device loosens the pulp bales and removes impurities in a dry process.

[0021] Preferably, the material preparation system further comprises a thick pulp screen arranged downstream of the high-concentration refiner, wherein the tailings obtained by passing through the thick pulp screen after the pulp output from the high-concentration refiner is diluted are provided to the inlet of the intermittent high-concentration pulper directly or after being concentrated.

[0022] According to a third aspect of the present invention, a material preparation method for a high-concentration refiner is provided, which adopts the material preparation system for the above-mentioned high-concentration refiner, comprising the following steps: preparing pulp bags and removing heavy impurities; using a drum pulper to break up the pulp bags and output pulp with a feeding concentration suitable for the high-concentration refiner; and providing the pulp output by the drum pulper to the high-concentration refiner.

[0023] Optionally, the method further comprises the following steps: diluting the pulp output from the high-concentration refiner and passing it through a thick pulp screen, and providing the obtained tailings directly or after being concentrated to the inlet of the drum pulper.

[0024] According to a fourth aspect of the present invention, a method for preparing a material for a high-concentration refiner is provided, which uses the above-mentioned material preparation system for a high-concentration refiner, comprising the following steps: preparing pulp bags and removing heavy impurities; breaking up the pulp bags with an intermittent high-concentration pulper and outputting the pulp into a buffer tank; and concentrating the pulp received from the intermittent high-concentration pulper to the feed concentration of the high-concentration refiner during the conveying process with a screw conveyor and providing it to the high-concentration refiner.

[0025] Optionally, the method further comprises the following steps: diluting the pulp output from the high-consistency refiner and passing it through a thick pulp screen, and providing the obtained tailings directly or after being concentrated to the inlet of the intermittent high-consistency pulper.

[0026] According to the stock preparation system and method for a high-concentration pulping machine provided by the present invention, stock preparation can be completed without using additional pulp concentration equipment, thereby saving investment costs, reducing energy consumption and simplifying the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 is a schematic diagram of a material preparation system for a high-consistency refiner according to an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a material preparation system for a high-consistency refiner according to another embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of a material preparation system for a high-consistency refiner according to another embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a material preparation system for a high-consistency refiner according to another embodiment of the present invention;

[0032] Figure 5 It is a schematic flow chart of a material preparation method for a high-consistency refiner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] Figure 1 , Figure 2 , Figure 3 and Figure 4 The material preparation system of the high-consistency refiner according to an embodiment of the present invention is schematically shown, which is used to break up pulp bags and provide pulp for the high-consistency refiner 200. Figures 1 to 3 The device for breaking up the pulp bale in the stock preparation system of the high-consistency refiner is a drum pulper 120, and the drum pulper 120 outputs pulp of a feed concentration suitable for the high-consistency refiner 200. Figure 4 The device for breaking up the pulp bales in the stock preparation system of the high-consistency pulper can be either a drum pulper or an intermittent high-consistency pulper.

[0035] The feed concentration suitable for the high-concentration pulper 200 is generally in the range of 15% to 45%, and the preferred feed concentration is about 24% to 28%. The conventional drum pulper usually has a pulping section and a screening section, wherein the pulp concentration in the pulping section can be as high as 30%. The pulp must be diluted before entering the screening section or when passing through the screening section, and the diluted pulp is a low-concentration pulp (generally less than 5%). The inventor of the present invention changes the conventional use of the drum pulper so that it directly outputs high-concentration pulp to feed the high-concentration pulper 200.

[0036] It should be understood that other types of high-concentration pulping devices, whether continuous feed, continuous discharge or intermittent feed, intermittent discharge, can also be used as optional alternatives to the drum pulper as long as they can output pulp with a feed concentration suitable for the high-concentration refiner 200.

[0037] For example, the pulp bales may be composed of waste paper, board, etc., which are usually bound into bales by metal wires (such as iron wires). Before entering the stock preparation system of the high-consistency refiner, the bales may be disassembled and the metal wires may be removed manually or by automated mechanical equipment. For example, it may be further detected whether the metal wires are completely removed during the subsequent conveying process.

[0038] Illustratively, the unpacked pulp bales can be provided to the inlet of the drum pulper 120 together with an appropriate amount of dilution water for pulping, and pulp having a feed consistency suitable for a high-consistency refiner can be obtained at the outlet of the drum pulper 120 .

[0039] In some embodiments, a heavy impurity removal device 110 is arranged upstream of the drum pulper 120. In the embodiments of the present invention, the pulp output from the drum pulper 120 is high-concentration pulp, and the high-concentration pulp is provided to the high-concentration refiner 200 without dilution and concentration process, and it is not easy to remove impurities in the process of transporting from the outlet of the drum pulper 120 to the high-concentration refiner 200. Therefore, a preferred embodiment is to remove heavy impurities before the pulp bag enters the drum pulper 120.

[0040] Optionally, the device 110 for removing heavy impurities includes a rotating drum with holes, which is designed to allow the pulp bags to be scattered and move forward as the rotating drum rotates, and to allow the heavy impurities to be screened out from the holes during the rotation process. Using such a rotating drum with holes can achieve both bag scattering and impurity removal.

[0041] See also Figure 1 In some embodiments, the pulp output from the drum pulper 120 is directly provided to the feed screw of the high-consistency refiner 200 .

[0042] See also Figure 2 In some embodiments, a buffer tank 130 is provided downstream of the drum pulper 120 (for example, disposed at the outlet of the drum pulper 120), and the pulp outputted from the drum pulper 120 is provided to the buffer tank 130, which collects the pulp and directly provides the pulp to the feeding screw of the high-concentration refiner 200. The buffer tank 130 is used to receive the output pulp and play a buffering role, so that the concentration and volume of the supplied pulp can be more uniform.

[0043] See also Figure 3 In some embodiments, a screw conveyor 140 is arranged downstream of the drum pulper 120 (for example, arranged at the outlet of the drum pulper 120), and the pulp output from the drum pulper 120 is provided to the screw conveyor 140. The screw conveyor 140 is designed to be suitable for providing the pulp to the feeding screw of the high-concentration refiner 200 with uniform concentration and volume flow through variable frequency control.

[0044] Optionally, in the above embodiment, the screw conveyor 140 is designed to have a dehydration function, suitable for concentrating the pulp received from the drum pulper 120 to the feeding concentration of the high-concentration refiner 200 during the conveying process and conveying it to the feeding screw of the high-concentration refiner 200.

[0045] See also Figure 4In some embodiments, a buffer tank 130 and a screw conveyor 140 are provided downstream of the drum pulper 120 (or an intermittent high-concentration pulper). The pulp output from the drum pulper 120 is provided to the buffer tank 130. The buffer tank 130 collects the pulp and provides the pulp to the screw conveyor 140 (for example, the screw conveyor 140 is arranged at the bottom of the buffer tank 130). The screw conveyor 140 is designed to be suitable for providing the pulp to the feeding screw of the high-concentration pulper 200 with uniform concentration and volume flow through variable frequency control.

[0046] Optionally, in the above embodiment, the screw conveyor 140 is designed to have a dehydration function, suitable for concentrating the pulp received from the drum pulper 120 to the feeding concentration of the high-concentration refiner 200 during the conveying process and conveying it to the feeding screw of the high-concentration refiner 200.

[0047] It is understandable that the dehydration function of the screw conveyor 140 does not mean that the screw conveyor 140 is used as a concentrating device. The concentration of the slurry output by the drum pulper 120 meets or is slightly lower than the feeding concentration requirement of the high-concentration refiner 200. The screw conveyor 140 only further dehydrates the slurry to ensure that the feeding concentration required by the high-concentration refiner 200 is reached, or to ensure that the preferred feeding concentration is reached.

[0048] It is understandable that in the material preparation system for the high-concentration refiner provided by the present invention, the implementation method of providing the pulp output from the drum pulper 120 to the high-concentration refiner 200 is not limited to the above embodiment, and other modified embodiments or alternative embodiments may be provided as needed.

[0049] See also Figure 1 , Figure 2 , Figure 3 or Figure 4 In some embodiments, the stock preparation system 100 further includes a thick stock screen 150 arranged downstream of the high-consistency refiner 200. After the pulp output from the high-consistency refiner 200 is diluted, the tailings obtained by the thick stock screen 150 are provided to the inlet of the drum pulper 120. It can be understood that the thick stock screen 150 can separate the pulp to obtain good pulp and tailings, and the good pulp can be sent to the subsequent papermaking process for further processing (slurry preparation), and the tailings can be returned to the drum pulper 120 for repeated pulping, so as to make full use of the raw materials, thereby making the process more environmentally friendly and economical.

[0050] Figure 5 A material preparation method for a high-consistency refiner according to the present invention is shown. The method adopts a material preparation system for a high-consistency refiner in any of the above embodiments, and comprises the following steps:

[0051] Step S101: prepare pulp bags and remove heavy impurities;

[0052] Step S102: using the drum pulper 120 to disintegrate the pulp bag and output pulp with a feed concentration suitable for the high-concentration refiner 200;

[0053] Step S103: providing the pulp outputted from the drum pulper 120 to the high-consistency refiner 200;

[0054] In some embodiments, the material preparation method for a high-consistency refiner provided by the present invention further comprises:

[0055] Step S104 : the pulp output from the high-consistency refiner 200 is diluted and passed through the thick pulp screen 150 , and the obtained tailings are provided to the inlet of the drum pulper 120 .

[0056] The above step S103 can have many variations:

[0057] like Figure 1 As shown, the pulp output from the drum pulper 120 is directly provided to the feed screw of the high-consistency refiner 200 .

[0058] like Figure 2 As shown, a buffer tank 130 is arranged downstream of the drum pulper 120, and the pulp output from the drum pulper 120 is provided to the buffer tank 130. The buffer tank 130 is used to collect the pulp and the pulp is directly provided to the feeding screw of the high-consistency refiner 200 by the self-contained conveying screw located at the bottom of the buffer tank.

[0059] like Figure 3 As shown, a screw conveyor 140 is arranged downstream of the drum pulper 120 to provide the pulp output from the drum pulper 120 to the screw conveyor 140. The screw conveyor 140 controlled by a variable frequency is used to provide the pulp to the feeding screw of the high-consistency refiner 200 with uniform concentration and volume flow.

[0060] like Figure 4 As shown, a buffer tank 130 and a screw conveyor 140 are arranged downstream of the drum pulper 120, and the pulp output from the drum pulper 120 is provided to the buffer tank 130. The buffer tank 130 is used to collect the pulp and provide the pulp to the screw conveyor 140. The screw conveyor 140 controlled by a variable frequency is used to provide the pulp to the feeding screw of the high-concentration refiner 200 with uniform concentration and volume flow.

[0061] The preferred embodiments of the present invention are described above, but the spirit and scope of the present invention are not limited to the specific contents disclosed herein. Those skilled in the art can make more embodiments and applications based on the teachings of the present invention, and these embodiments and applications are all within the spirit and scope of the present invention. The spirit and scope of the present invention are not limited by the specific embodiments, but by the claims.

[0062] Reference numerals list

[0063] 110-heavy impurity removal device;

[0064] 120-drum pulper;

[0065] 130-buffer tank;

[0066] 140-screw conveyor;

[0067] 150-thick pulp screen;

[0068] 200-High-consistency refiner;

[0069] R-tailings;

[0070] A-Good pulp.

Claims

1. A material preparation system for a high-consistency refiner, used for breaking up pulp bags and providing pulp for the high-consistency refiner, characterized in that: The device for breaking up pulp bales in the stock preparation system of the high-consistency refiner is a drum pulper, and the drum pulper outputs pulp with a feed concentration suitable for the high-consistency refiner.

2. The material preparation system for a high-consistency refiner according to claim 1, characterized in that: A heavy impurity removal device is arranged upstream of the drum pulper, and the heavy impurity removal device is used to loosen the pulp bales and remove impurities in a dry process.

3. The material preparation system for a high-consistency refiner according to claim 1 or 2, characterized in that: The pulp output from the drum pulper is directly supplied to the feed screw of the high consistency refiner.

4. The material preparation system for a high-consistency refiner according to claim 1 or 2, characterized in that: A buffer tank is provided downstream of the drum pulper, and pulp outputted from the drum pulper is supplied to the buffer tank. The buffer tank collects the pulp and directly supplies the pulp to the feeding screw of the high-consistency refiner through a self-contained conveying screw at the bottom of the buffer tank.

5. The material preparation system for a high-consistency refiner according to claim 1 or 2, characterized in that: A screw conveyor is arranged downstream of the drum pulper to supply pulp outputted from the drum pulper to the screw conveyor, and the screw conveyor is designed to be suitable for supplying pulp with uniform concentration and volume flow to a feeding screw of the high-consistency refiner through variable frequency control.

6. The material preparation system for a high-consistency refiner according to claim 5, characterized in that: The screw conveyor is designed to have a dehydration function, and is suitable for concentrating the pulp received from the drum pulper to the feeding concentration of the high-concentration refiner during the conveying process and conveying it to the feeding screw of the high-concentration refiner.

7. The material preparation system for a high-consistency refiner according to claim 1 or 2, characterized in that: A buffer tank and a screw conveyor are provided downstream of the drum pulper. The pulp output from the drum pulper is supplied to the buffer tank. The buffer tank collects the pulp and supplies it to the screw conveyor. The screw conveyor is designed to be suitable for supplying the pulp to the feeding screw of the high-consistency refiner with uniform concentration and volume flow through variable frequency control.

8. The material preparation system for a high-consistency refiner according to claim 7, characterized in that: The screw conveyor is designed to have a dehydration function, and is suitable for concentrating the pulp received from the drum pulper to the feeding concentration of the high-concentration refiner during the conveying process and conveying it to the feeding screw of the high-concentration refiner.

9. The material preparation system for a high-consistency refiner according to claim 2, characterized in that: The heavy impurity removal device comprises a rotating drum with holes, wherein the rotating drum is designed to allow the pulp pack to be dispersed and move forward as the rotating drum rotates, and the heavy impurities are screened out from the holes during the rotation process.

10. The material preparation system for a high-consistency refiner according to claim 1 or 2, characterized in that: The stock preparation system further comprises a thick stock screen arranged downstream of the high-consistency refiner, wherein the tailings obtained by passing through the thick stock screen after the pulp output from the high-consistency refiner is diluted are provided to the inlet of the drum pulper.

11. A material preparation system for a high-consistency refiner, used for breaking up pulp bags and providing pulp for the high-consistency refiner, characterized in that: The device for breaking up pulp bales in the stock preparation system of the high-consistency pulper is an intermittent high-consistency pulper, and a buffer tank and a screw conveyor are provided downstream of the intermittent high-consistency pulper. The pulp output by the intermittent high-consistency pulper is provided to the buffer tank, and the buffer tank collects the pulp and provides the pulp to the screw conveyor. Among them, the screw conveyor is designed to have a dehydration function, suitable for concentrating the pulp received from the intermittent high-concentration pulper to the feeding concentration of the high-concentration refiner and conveying it to the feeding screw of the high-concentration refiner with uniform concentration and volume flow through frequency conversion control.

12. The material preparation system for a high-consistency refiner according to claim 11, characterized in that: A heavy impurity removal device is arranged upstream of the intermittent high-consistency pulper, and the heavy impurity removal device is used to loosen the pulp bales and remove impurities in a dry process.

13. The material preparation system for a high-consistency refiner according to claim 11 or 12, characterized in that: The stock preparation system further comprises a thick stock screen arranged downstream of the high-consistency refiner, wherein the tailings obtained by passing through the thick stock screen after the pulp output from the high-consistency refiner is diluted are provided to the inlet of the intermittent high-consistency pulper directly or after being concentrated.

14. A method for preparing materials for a high-concentration refiner, characterized in that: A material preparation system for a high-consistency refiner according to any one of claims 1 to 10, comprising the following steps: Prepare pulp bags and remove heavy impurities; Using a drum pulper to disintegrate the pulp bag and output pulp with a feed concentration suitable for the high-consistency refiner; The pulp output from the drum pulper is provided to the high-consistency refiner.

15. The method according to claim 14, characterized in that The following steps are also included: The pulp output from the high-consistency refiner is diluted and passed through a thick pulp screen, and the obtained tailings are provided to the inlet of the drum pulper directly or after being concentrated.

16. A method for preparing materials for a high-concentration refiner, characterized in that: A material preparation system for a high-consistency refiner according to any one of claims 11 to 13, comprising the following steps: Prepare pulp bags and remove heavy impurities; Use an intermittent high-consistency pulper to break up the pulp bales and output the pulp into a buffer tank; The received pulp output from the intermittent high-consistency pulper is concentrated to the feed concentration of the high-consistency refiner by a screw conveyor and then supplied to the high-consistency refiner.

17. The method according to claim 16, characterized in that The following steps are also included: The pulp output from the high-consistency refiner is diluted and passed through a thick stock screen, and the obtained tailings are provided to the inlet of the intermittent high-consistency pulper directly or after being concentrated.

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