阅读说明：本技术 一种废纸高回收率清洁制浆的排渣破碎工艺 (Slag discharging and crushing process for high-recovery clean pulping of waste paper ) 是由 李文斌 于 2021-07-30 设计创作，主要内容包括：本发明属于废纸排渣破碎技术领域,尤其是一种废纸高回收率清洁制浆的排渣破碎工艺,针对现有的废纸原料短缺,废纸破渣效率低,对残渣收集利用率低,工艺流程复杂问题,现提出如下方案,其包括以下工艺步骤：S1：残渣破碎,采用温和碎浆的方式：利用碎解助剂、控制碎浆温度、控制碎浆浓度、控制转子转速进行残渣破碎；S2：残渣筛选：利用多功能复合压力筛的方式进行残渣筛选；S3：残渣分级筛选：利用多种不同孔径筛网进行筛选；S4：残渣回收利用：使用碎解机对排渣进行处理后回用,将尾渣中的白水回用；S5：残渣热力分散；S6：残渣储存。本发明操作方便,提高了废纸破渣效率低,提高了对残渣收集利用率。(The invention belongs to the technical field of waste paper slag discharge and crushing, in particular to a slag discharge and crushing process for high-recovery clean pulping of waste paper, which aims at solving the problems of shortage of waste paper raw materials, low waste paper slag crushing efficiency, low residue collection and utilization rate and complex process flow and provides the following scheme, comprising the following process steps: s1: crushing residues by adopting a mild pulping mode: crushing residues by using a crushing aid, controlling the crushing temperature, controlling the crushing concentration and controlling the rotating speed of a rotor; s2: residue screening: screening residues by using a multifunctional composite pressure screen; s3: and (3) grading and screening residues: screening by using various screens with different apertures; s4: and (3) recycling residues: treating and recycling the discharged slag by using a crusher, and recycling white water in the tailings; s5: thermally dispersing the residue; s6: and (5) storing the residues. The waste paper residue breaking device is convenient to operate, improves waste paper residue breaking efficiency, and improves residue collection utilization rate.)

1. A slag discharge and crushing process for high-recovery clean pulping of waste paper is characterized by comprising the following process steps:

s1: crushing residues by adopting a mild pulping mode: crushing residues by using a crushing aid, controlling the crushing temperature, controlling the crushing concentration and controlling the rotating speed of a rotor;

s2: residue screening: screening residues by using a multifunctional composite pressure screen;

s3: and (3) grading and screening residues: screening by using various screens with different apertures;

s4: and (3) recycling residues: treating and recycling the discharged slag by using a crusher, and recycling white water in the tailings;

s5: thermally dispersing the residue;

s6: and (5) storing the residues.

2. The slag discharging and crushing process for high-recovery clean pulping of waste paper as claimed in claim 1, wherein in S1, the disintegration aid is a surfactant, and the disintegration aid is a mixture of sodium dodecylbenzenesulfonate surfactant and Na2SiO 3.

3. The slag discharge and crushing process for high recovery rate clean pulping of waste paper as claimed in claim 1, wherein in S1, the pulping temperature is controlled to be 25-30 ℃, the pulping concentration is controlled to be 15-20%, and the rotor speed is controlled to carry out pulping under the condition of 700-750r/min, the main steps include:

firstly, adding the residue into a container with the volume of 30L, and then adding white water for dilution until the concentration reaches 15-20%, and stopping dilution;

secondly, adding the disintegration auxiliary agent into the container and stirring, wherein the reaction time is 2-3 h.

4. The residual slag crushing process of high-recovery clean pulping of waste paper according to claim 1, wherein in step S2, 1/5 of residue after completion of reaction is introduced into a first filter cylinder for screening, a first screen is arranged at the bottom of the first filter cylinder, a pressure plug is arranged at the top of the filter cylinder, the residue is subjected to pressure screening by the pressure plug, screened pulp enters a second filter cylinder, then the step S2 is repeated, the residue is introduced into the first filter cylinder again for filtering until the residue is completely filtered, and residue a after the first filtering is collected.

5. The process of claim 1, wherein in step S3, the first screened slurry is introduced into a second filter cartridge, screening is performed by means of the same composite pressure screen, the second screened slurry is collected in a container of step S1 for reuse, and the second filtered residue B is collected.

6. The residual slag crushing process of waste paper high recovery rate clean pulping according to claim 1, wherein in S4, the residue A and the residue B are mixed together and are subjected to crushing treatment by using a crusher, crushing is carried out at a crushing speed of 800-.

7. The slag discharge and crushing process for high-recovery clean pulping of waste paper as claimed in claim 1, wherein in S5, the residue is cooled by blowing air through a cooler for 40-50 min.

8. The process of claim 1, wherein the cooled residue is collected in S6 and collected in a residue collection tank.

Technical Field

The invention relates to the technical field of waste paper slag discharge and crushing, in particular to a slag discharge and crushing process for high-recovery clean pulping of waste paper.

Background

Paper companies for waste paper can explore from three directions: firstly, purchasing waste paper pulp boards and wet pulp to supplement a small part of gaps; secondly, seeking for waste paper to replace raw materials, including mechanical pulp, biological straw pulp and the like; thirdly, the pulping rate of the waste paper is improved. The truly important direction of the three points is to improve the pulping rate of the waste paper. Linerboard, corrugating medium, coated board made from secondary fibers, and uncoated board are major sources of waste paper. After the waste paper fibers are repeatedly used for many times, the fibers are shorter and shorter, the strength is lower and lower, the stickies are more and more, and the pulping yield is lower and lower. Because the process flow of waste paper pulping is mature, in order to improve the yield of the waste paper pulping, the main research direction at present is to optimize the performance of pulping equipment and fully improve the utilization efficiency of tailings, and the method mainly comprises the structural design of a pulper, a pressure screen and a slag remover, the recycling of heavy slag and slag removal in a coarse screen and a fine screen, and the like.

The existing waste paper has the disadvantages of shortage of raw materials, low waste paper residue breaking efficiency, low residue collection and utilization rate and complex process flow.

Disclosure of Invention

The invention aims to solve the defects of shortage of waste paper raw materials, low waste paper residue breaking efficiency, low residue collection and utilization rate and complex process flow in the prior art, and provides a slag discharging and breaking process for high-recovery clean pulping of waste paper.

A slag discharge and crushing process for high-recovery clean pulping of waste paper comprises the following process steps:

s1: crushing residues by adopting a mild pulping mode: crushing residues by using a crushing aid, controlling the crushing temperature, controlling the crushing concentration and controlling the rotating speed of a rotor;

s2: residue screening: screening residues by using a multifunctional composite pressure screen;

s3: and (3) grading and screening residues: screening by using various screens with different apertures;

s4: and (3) recycling residues: treating and recycling the discharged slag by using a crusher, and recycling white water in the tailings;

s5: thermally dispersing the residue;

s6: and (5) storing the residues.

Preferably, in S1, the disintegration aid is a surfactant, and the disintegration aid is a mixture of a sodium dodecylbenzenesulfonate surfactant and Na2SiO 3.

Preferably, in the step S1, the pulping temperature is controlled to be 25-30 ℃, the pulping concentration is controlled to be 15-20%, and the rotor speed is controlled to perform pulping under the conditions of 700 and 750r/min, and the method mainly comprises the following steps:

firstly, adding the residue into a container with the volume of 30L, and then adding white water for dilution until the concentration reaches 15-20%, and stopping dilution;

secondly, adding the disintegration auxiliary agent into the container and stirring, wherein the reaction time is 2-3 h.

Preferably, in S2, 1/5 of the residue after the reaction is completed is introduced into a first filter cartridge for screening, a first screen is arranged at the bottom of the first filter cartridge, a pressure plug is arranged at the top of the filter cartridge, the residue is screened under pressure by the pressure plug, the screened slurry enters a second filter cartridge, and then the step S2 is repeated, the residue is introduced into the first filter cartridge again for filtering until the residue is completely filtered, and the residue a after the first filtering is collected.

Preferably, in S3, the slurry obtained by the first screening is introduced into a second filter cartridge, screening is performed by using the same composite pressure screen, and the slurry obtained by the second screening is collected in a container in S1 and reused, and the residue B obtained by the second filtering is collected.

Preferably, in the step S4, the residue A and the residue B are mixed together and are subjected to disintegration treatment by a disintegrator, the disintegration is carried out at a disintegration speed of 800-850r/min for 40-50min, and the squeezed white water in the tailings is recycled into the container in the step S1 together with the slurry for reuse.

Preferably, in S5, the residue is cooled by blowing air through a cooler. The cooling time is 40-50 min.

Preferably, in S6, the cooled residue is collected and collected in a slag collection tank.

Compared with the prior art, the invention has the advantages that:

(1) according to the scheme, the crushing aid is utilized to control the crushing temperature, the crushing concentration and the rotating speed of the rotor to crush the residues, so that the residue crushing effect can be improved, the crushing process of the waste paper is completed under the action of the high-temperature clean enzyme of the crushing aid, and the waste paper residue crushing efficiency is improved;

(2) a multifunctional composite pressure sieve with functions of defibering and screening is adopted to replace a floating sieve and a subsequent impurity sorting machine in a coarse sieve, so that waste paper processing procedures are reduced; the slag discharged by the slag remover and the light slag remover are collected into a slag collecting tank, concentrated by an extruder with a sieve plate and then sent to a crushing working section, and then returned to the pulper together with the extruded white water for recycling, thereby saving resources.

The waste paper residue breaking device is convenient to operate, improves waste paper residue breaking efficiency, and improves residue collection utilization rate.

Drawings

FIG. 1 is a process flow diagram of a slag discharge crushing process for high-recovery clean pulping of waste paper according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Example one

Referring to fig. 1, a slag discharge and crushing process for high-recovery clean pulping of waste paper comprises the following process steps:

s1: crushing residues by adopting a mild pulping mode: crushing residues by using a crushing aid, controlling the crushing temperature, controlling the crushing concentration and controlling the rotating speed of a rotor;

s2: residue screening: screening residues by using a multifunctional composite pressure screen;

s3: and (3) grading and screening residues: screening by using various screens with different apertures;

s4: and (3) recycling residues: treating and recycling the discharged slag by using a crusher, and recycling white water in the tailings;

s5: thermally dispersing the residue;

s6: and (5) storing the residues.

In this example, in S1, the disintegration aid is a surfactant, and the disintegration aid is a mixture of a sodium dodecylbenzenesulfonate surfactant and Na2SiO 3.

In this embodiment, in S1, the pulping temperature is controlled to 25 ℃, the pulping concentration is controlled to 15%, and the rotor speed is controlled to perform pulping under the condition of 700r/min, and the method mainly includes:

firstly, adding the residue into a container with the volume of 30L, and then adding white water for dilution until the concentration reaches 15%, and stopping dilution;

secondly, adding the disintegration auxiliary agent into the container and stirring, wherein the reaction time is 2 hours.

In this embodiment, in S2, 1/5 of the residue after completion of the reaction is introduced into a first filter cartridge for screening, a first screen is disposed at the bottom of the first filter cartridge, a pressure plug is disposed at the top of the filter cartridge, the residue is subjected to pressure screening by the pressure plug, the screened slurry enters a second filter cartridge, and then the step S2 is repeated, the residue is introduced into the first filter cartridge again for filtering until the residue is completely filtered, and the residue a after the first filtration is collected.

In this example, in S3, the slurry obtained by the first screening was introduced into a second filter cartridge, screening was performed using the same composite pressure screen, and the slurry obtained by the second screening was collected in a container in S1 and reused, and the residue B obtained by the second filtration was collected.

In this example, in S4, the residue a and the residue B were mixed together and subjected to a disintegrating treatment using a disintegrator, and then, the mixture was disintegrated at a disintegrating speed of 800r/min for 40min, and the white water squeezed out of the tailings was recovered together with the slurry into a container in S1 and reused.

In this embodiment, in S5, the residue is cooled by blowing air using a cooling machine. The cooling time was 40 min.

In this embodiment, in S6, the cooled residue is collected and collected in a slag collection tank.

Example two

Referring to fig. 1, a slag discharge and crushing process for high-recovery clean pulping of waste paper comprises the following process steps:

s1: crushing residues by adopting a mild pulping mode: crushing residues by using a crushing aid, controlling the crushing temperature, controlling the crushing concentration and controlling the rotating speed of a rotor;

s2: residue screening: screening residues by using a multifunctional composite pressure screen;

s3: and (3) grading and screening residues: screening by using various screens with different apertures;

s4: and (3) recycling residues: treating and recycling the discharged slag by using a crusher, and recycling white water in the tailings;

s5: thermally dispersing the residue;

s6: and (5) storing the residues.

In this example, in S1, the disintegration aid is a surfactant, and the disintegration aid is a mixture of a sodium dodecylbenzenesulfonate surfactant and Na2SiO 3.

In this embodiment, in S1, the pulping temperature is controlled to be 28 ℃, the pulping concentration is controlled to be 18%, and the rotor speed is controlled to perform pulping under the condition of 720r/min, and the method mainly includes the steps of:

firstly, adding the residue into a container with the volume of 30L, and then adding white water for dilution until the concentration reaches 18 percent, and stopping dilution;

secondly, the disintegration aid is added into the container and stirred, and the reaction time is 2.5 h.

In this embodiment, in S2, 1/5 of the residue after completion of the reaction is introduced into a first filter cartridge for screening, a first screen is disposed at the bottom of the first filter cartridge, a pressure plug is disposed at the top of the filter cartridge, the residue is subjected to pressure screening by the pressure plug, the screened slurry enters a second filter cartridge, and then the step S2 is repeated, the residue is introduced into the first filter cartridge again for filtering until the residue is completely filtered, and the residue a after the first filtration is collected.

In this example, in S3, the slurry obtained by the first screening was introduced into a second filter cartridge, screening was performed using the same composite pressure screen, and the slurry obtained by the second screening was collected in a container in S1 and reused, and the residue B obtained by the second filtration was collected.

In this example, in S4, the residue a and the residue B were mixed together and subjected to a disintegrating treatment using a disintegrator, and then, they were disintegrated at a disintegrating speed of 820r/min for 45min, and the white water squeezed out of the tailings was recovered together with the slurry into a container in S1 and reused.

In this embodiment, in S5, the residue is cooled by blowing air using a cooling machine. The cooling time was 45 min.

In this embodiment, in S6, the cooled residue is collected and collected in a slag collection tank.

EXAMPLE III

Referring to fig. 1, a slag discharge and crushing process for high-recovery clean pulping of waste paper comprises the following process steps:

s1: crushing residues by adopting a mild pulping mode: crushing residues by using a crushing aid, controlling the crushing temperature, controlling the crushing concentration and controlling the rotating speed of a rotor;

s2: residue screening: screening residues by using a multifunctional composite pressure screen;

s3: and (3) grading and screening residues: screening by using various screens with different apertures;

s4: and (3) recycling residues: treating and recycling the discharged slag by using a crusher, and recycling white water in the tailings;

s5: thermally dispersing the residue;

s6: and (5) storing the residues.

In this example, in S1, the disintegration aid is a surfactant, and the disintegration aid is a mixture of a sodium dodecylbenzenesulfonate surfactant and Na2SiO 3.

In this embodiment, in S1, the pulping temperature is controlled to be 30 ℃, the pulping concentration is controlled to be 20%, and the rotor speed is controlled to perform pulping under the condition of 750r/min, and the method mainly includes the steps of:

firstly, adding the residue into a container with the volume of 30L, and then adding white water for dilution until the concentration reaches 20%, and stopping dilution;

secondly, adding the disintegration auxiliary agent into the container and stirring, wherein the reaction time is 3 hours.

In this embodiment, in S2, 1/5 of the residue after completion of the reaction is introduced into a first filter cartridge for screening, a first screen is disposed at the bottom of the first filter cartridge, a pressure plug is disposed at the top of the filter cartridge, the residue is subjected to pressure screening by the pressure plug, the screened slurry enters a second filter cartridge, and then the step S2 is repeated, the residue is introduced into the first filter cartridge again for filtering until the residue is completely filtered, and the residue a after the first filtration is collected.

In this example, in S3, the slurry obtained by the first screening was introduced into a second filter cartridge, screening was performed using the same composite pressure screen, and the slurry obtained by the second screening was collected in a container in S1 and reused, and the residue B obtained by the second filtration was collected.

In this example, in S4, the residue a and the residue B were mixed together and subjected to a disintegrating treatment using a disintegrator, and then, the mixture was disintegrated at a disintegrating speed of 850r/min for 50min, and the white water squeezed out of the tailings was recovered together with the slurry into a container in S1 and reused.

In this embodiment, in S5, the residue is cooled by blowing air using a cooling machine. The cooling time was 50 min.

In this embodiment, in S6, the cooled residue is collected and collected in a slag collection tank.

Example four

The index research is carried out on the slag discharge crushing by combining the first embodiment to the third embodiment, and the main technical indexes are as follows:

pulping system row Reduction of slag amount

Domestic waste paper Pulping yield

Waste paper unit consumption Reduce

Power consumption per ton of pulp is reduced Down to

Pulping main production System energy consumption

Tightness of finished paper

Burst index

Ring pressure index

Water absorption

Smoothness of the surface

Moisture content of delivery

Example one

20%

＜1.25

＞85%

＜231kmh

＜60kgce/t

≥0.72g/cm3

≥2.650kPa·m2/g

≥9.1N·m/g

39/70g/m2

≥7s

8.0±1.8%

Example two

19%

＜1.2

＞86%

＜230kmh

＜60kgce/t

≥0.72g/cm3

≥2.60kPa·m2/g

≥9.0N·m/g

40/70g/m2

≥7s

8.0±2%

EXAMPLE III

21%

＜1.25

＞85%

＜230kmh

＜61kgce/t

≥0.70g/cm3

≥2.65kPa·m2/g

≥8.9N·m/g

38/70g/m2

≥7s

8.0±1.9%

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.