Efficient purification method of papermaking white water mixed micro-fine stickies based on ordered adhesion of hydrophilic / hydrophobic materials

Abstract

The application discloses a papermaking white water mixed micro-fine adhesive substance purification method based on ordered adhesion of hydrophilic / hydrophobic materials; fibers in papermaking white water are recovered first to obtain mixed micro-fine adhesive substances with a particle size less than 100 microns, and papermaking white water containing fine fibers and fillers; after treatment, the papermaking white water is stirred and adhered by a rotor with a surface coated with fixed hydrophilic materials at a temperature of 25-90 DEG C and a rotating speed of 150-1000 r / min for 15-60 min, and then stirred and adhered by a rotor with a surface coated with fixed hydrophobic materials for 15-60 min; the stirring and adhesion of the hydrophilic materials and the hydrophobic materials are cycled once or more times. The application can continuously remove adhesive substance particles with complex components in various papermaking white water, especially adhesive substance particles with multiple sources and complex components, and the effect is remarkable; the removal efficiency of micro-fine adhesive substances in papermaking white water reaches 52-59%.

Description

TECHNICAL FIELD

[0001] The present application relates to the adhesive, especially relates to the papermaking white water mixed fine adhesive purification method, specifically relates to the efficient purification method of the papermaking white water fine adhesive based on the ordered adhesion of the hydrophilic / hydrophobic material which has a negative impact on the paper machine operation and the paper product quality in the papermaking process; belongs to the technical field of fiber recycling. BACKGROUND

[0002] In recent years, the consumption of waste paper pulp in the world has been increasing. Waste paper is an important raw material for pulp and paper industry in China. The recycling of waste paper not only can save a large amount of plant fiber raw material and reduce production cost, but also has far-reaching significance for energy saving and emission reduction and environmental pollution relief. However, with the continuous increase of waste paper utilization and the increasing types of impurities in waste paper, the problem of adhesive is becoming more and more prominent. The adhesive in waste paper has wide sources, complex composition, and characteristics such as adhesion and deformation. If the adhesive cannot be effectively removed, it will deposit on mechanical equipment, pipelines and even paper surface, affecting normal production and product quality.

[0003] The adhesive control problem in waste paper runs through the whole waste paper recycling system, from pulping to pulp conveying and forming, each link faces the problem of adhesive. The adhesive accumulates in the process of waste paper pulping, hot dispersion and rubbing, and is dispersed into adhesive particles of different particle sizes. The particle size greater than 100 μm is called large adhesive, and the particle size less than the particle size is called fine adhesive. The large adhesive can be removed by screening, purification, flotation, hot dispersion and other means in the pulping stage of waste paper because of its large particle size, but the fine adhesive is not suitable for these methods because of its small particle size. Because the white water of modern paper machine is closed circulation, with the extension of production time, the fine adhesive is continuously enriched in the white water, and some colloidal and dissolved substances in the white water will also flocculate into secondary adhesive under certain conditions. The sudden change of system environment will cause the aggregation of fine adhesive. When the content of fine adhesive in white water accumulates to a certain extent, it will cause large area instability of the whole wet part system, resulting in paper breakage and other production accidents.

[0004] The pulp and paper industry applies various methods to control adhesive. These methods mainly include mechanical method, chemical method and biological method. The mechanical method includes screening, purification, washing, flotation and hot dispersion and other physical methods. The chemical method is to remove fine adhesive by using chemical adsorption, modification, dispersion and surface passivation. The biological method mainly uses enzymes and enzyme preparations to reduce the adhesion of adhesive and prevent particle flocculation.

[0005] Current treatment technologies for white water micro-fines mostly focus on making them stably dispersed in white water, or fixed on the surface of the fiber to take out of the papermaking system. But this method cannot fundamentally solve the problem of micro-fines, and with the continuous accumulation of micro-fines in white water, micro-fines fixed in the fiber will re-enter the pulp system with the recycling of waste paper, making the problem of micro-fines more complex.

[0006] Papermaking is divided into pulping and papermaking stages, and the measures taken are different according to the different forms of micro-fines. In the pulping stage, large micro-fines exist in the form of micro-fines, which can be removed by screening, flotation and other methods, supplemented by biological enzyme technology mainly for degrading micro-fines and ink, and then removed by flotation and other methods; but in the papermaking stage, micro-fines mainly exist in the form of micro-fines. The technical measures of Chinese invention patent CN104695264B are mainly applied to the pulping stage, and are not suitable for the removal of micro-fines in the papermaking stage.

[0007] Chinese invention patent CN109024050B discloses a kind of high surface roughness of hydrophobic material based papermaking white water micro-fines high-efficiency adhesion purification method. The method first recovers the fiber and part of the fine components in the papermaking white water, stirs the white water suspension at 30-90 DEG C, at a speed of 50-2000r / min, uses high surface roughness of hydrophobic material rotor to stir and adhere white water micro-fines, the average removal rate of micro-fines is 29.58%, and the highest removal rate of micro-fines is 46.40%, but this is the optimal condition of various conditions of the purification method, since the removal rate of micro-fines is less than 50%, special downtime is needed to remove micro-fines, which affects the continuity and stability of production, and prolongs the production cycle. SUMMARY

[0008] The purpose of the present application is to solve the problem of continuous accumulation of micro-fines in the closed loop white water of paper machine, which leads to a series of serious obstacles, and to provide a kind of papermaking white water micro-fines removal efficiency reaching 52-59% based on the ordered adhesion of hydrophilic / hydrophobic materials.

[0009] The purpose of the present application is achieved by the following technical scheme:

[0010] The ordered adhesion of hydrophilic / hydrophobic materials based on the ordered adhesion of hydrophilic / hydrophobic materials, which includes the following steps:

[0011] 1) Recover the fiber in the papermaking white water to obtain mixed micro-fines with particle size less than 100 μm, and papermaking white water containing fine fibers and fillers;

[0012] 2) the papermaking white water treated in step 1) is stirred and adhered by a rotor with surface coated with hydrophilic material at a temperature of 25-90℃ and a rotating speed of 150-1000r / min for 15-60min, and then stirred and adhered by a rotor with surface coated with hydrophobic material at a temperature of 25-90℃ and a rotating speed of 150-1000r / min for 15-60min, and the stirring and adhering cycle of the hydrophilic material and then the hydrophobic material is repeated for one or more times, so that the fine adhesive substances in the white water are removed after being adhered to the surface of the hydrophilic material and the hydrophobic material; the surface static water contact angle of the hydrophilic material ranges from 50° to 70°; and the surface static water contact angle of the hydrophobic material ranges from 100° to 120°.

[0013] To further achieve the object of the present application, preferably, the adhesive substances in the papermaking white water mainly comprise ethylene-vinyl acetate copolymer, alkyl ketene dimer (AKD), polyacrylate polymer and / or styrene acrylate copolymer, etc.

[0014] Preferably, the fibers in the recycled papermaking white water are collected by a dynamic filter instrument in a laboratory condition, and the fibers and part of the fine fibers in the recycled papermaking white water are collected by a multi-disc filter in production.

[0015] Preferably, the filter screen of the dynamic filter instrument is a standard screen, and the stirring speed is 200-1000r / min; and the filter screen of the multi-disc filter has a mesh range of 60-200.

[0016] Preferably, the rotor is a symmetrical sheet, and the stirring and adhering mode is a convolute mode or a reciprocating mode.

[0017] Preferably, the papermaking white water in step 2) is treated at a temperature of 30-60℃ and a rotating speed of 100-1000r / min for 15-60min.

[0018] Preferably, the hydrophilic material is cotton fiber, hydrophilic polyurethane or non-woven fabric.

[0019] Preferably, the hydrophobic material is foamed copper, polyester fiber or epoxy resin plate.

[0020] Preferably, the coating and fixing is that the hydrophilic material or the hydrophobic material is coated on the whole rotor and then fixed by a detachable mode.

[0021] Preferably, the number of the stirring and adhering cycle of the hydrophilic material and then the hydrophobic material is 1-3 times.

[0022] Compared with the prior art, the present application has the following advantages and remarkable effects:

[0023] 1.The present application is mainly aimed at the current situation of complex composition of papermaking white water adhesive, which is derived from various sources, especially the adhesive in the new system of mixed waste paper after the "ban waste order", including common pressure-sensitive adhesive, hot melt adhesive, and various types of adhesive derived from papermaking chemicals, etc. The mixture of various typical adhesive substances mixed together is difficult to purify effectively by existing technology. The present application finds that the use of hydrophilic material adhesion first, followed by hydrophobic material adhesion, and repeating the sequence, has achieved unexpected results. For the first time, the adhesive in the system is reduced by more than 52% through single adhesion treatment, which can eliminate the problem of adhesive in the white water system and ensure the smooth operation of the papermaking system, fundamentally solving or alleviating the harm of adhesive to production and product quality. Whether changing the processing sequence or using single hydrophilic or hydrophobic material, the effect is far lower than that of the present application.

[0024] 2.The adhesion purification treatment of the present application is a physical method that does not interfere with the chemical environment of the papermaking system. Only by controlling temperature, speed and adhesion time, according to the ordered adhesion of adhesion materials to different components of adhesive, can the papermaking white water be efficiently purified without stopping, ensuring the continuity and stability of production, avoiding the extension of the cleaning cycle by at least 1-2 times due to the obstruction of adhesive in the existing technology, and maintaining normal production and stable product quality.

[0025] 3.The method of the present application can significantly remove various papermaking white water adhesive particles with complex components, especially those with multiple sources and complex components, and has better effect, which can minimize the interference of white water chemical environment and maintain the stability of the system, effectively promote the closed cycle utilization of papermaking white water, and has high practical value.

[0026] 4.The method of the present application is simple in operation, low in cost, easy to implement and has significant effect, which has obvious cost and efficiency advantages and is suitable for application in various paper mills. DETAILED DESCRIPTION

[0027] In order to further understand the present application, the following embodiments will be further described, but the embodiments of the present application are not limited to this.

[0028] The high-efficiency purification method of papermaking white water mixed micro-fine adhesive based on the ordered adhesion of hydrophilic / hydrophobic materials is as follows:

[0029] 1) Recovering the fibers in the papermaking white water to obtain papermaking white water containing mixed micro-fine adhesive with a particle size of less than 100 μm, and fine fibers and fillers;

[0030] 2) The papermaking white water treated in step 1) is stirred and adhered with a rotor with surface coated with hydrophilic material at a temperature of 25-90℃ and a rotating speed of 150-1000r / min for 15-60min, and then stirred and adhered with a rotor with surface coated with hydrophobic material for 15-60min, and the stirring and adhering of the hydrophilic material and the hydrophobic material is repeated for one or more times, so that the fine adhesive substances in the white water are adhered to the surface of the hydrophilic material and the hydrophobic material and then removed.

[0031] The present application finds that the necessary order of the adhesion is: first the surface of the hydrophilic material is adhered, and then the surface of the hydrophobic material is adhered; and the order is repeated for one or more times. Even if the surface of the hydrophobic material is adhered first and then the surface of the hydrophilic material is adhered, the effect is far less than that of the present application, and the removal efficiency of the fine adhesive substances in the papermaking white water is less than 50%. The present application only needs to be carried out under the conditions of controlling the temperature and the rotating speed of the papermaking white water for one time, and belongs to single treatment.

[0032] The surface static water contact angle of the hydrophilic material is in the range of 50°-70°; the surface static water contact angle of the hydrophobic material is in the range of 100°-120°; the hydrophilic material is, for example, cotton fiber, hydrophilic polyurethane, non-woven fabric material, etc.; and the hydrophobic material is, for example, foamed copper, polyester fiber, epoxy resin plate material, etc.

[0033] The adhesion purification treatment of the present application is a physical way, which does not interfere with the chemical environment of the papermaking system, and the purified white water can be reused in the papermaking system for continuous circulation.

[0034] Example 1

[0035] The label paper with pressure-sensitive adhesive and the copy paper are mixed at a ratio of 1:49 to prepare a slurry, and then the slurry is screened and filtered by a dynamic water filtering instrument with a 200-mesh filter screen to recover the components containing fibers, fillers, etc. in the slurry, so as to obtain white water containing fine fibers, mixed fine adhesive substances and fillers, etc. AKD is added to the white water to make the concentration of AKD in the white water be 0.1%, so that the adhesive substances contained in the white water are: ethylene-vinyl acetate copolymer, AKD and polyacrylate substances. Then, the white water is preheated, and the adhesive substance content in the preheated white water is measured by a laser particle size instrument to be 3.18×10 -1 mm 3 / mL.

[0036] White water mixed fine adhesive substance adhesion purification treatment: the preheated white water is stirred at a temperature of 25℃ and a rotating speed of 250r / min, and then the hydrophilic material filter cotton is fixed on the rotor to adhere for 60min, and the adhesive substance content in the white water is measured by a laser particle size instrument, and the adhesive substance content is calculated to be 2.16×10 -1 mm 3 / mL, and the adhesion efficiency is 32.14%.

[0037] After the hydrophobic material foam copper was fixed to the rotor and individually adhered to the preheated white water, the content of the adhesive substance therein was determined using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 2.21 x 10 -1 mm 3 / mL, and the adhesion efficiency was calculated to be 30.49%.

[0038] Under the same conditions, combined adhesion was performed, and the hydrophilic material filter cotton and the hydrophobic material foam copper were respectively fixed to different rotors. First, the hydrophobic foam copper material was used to adhere for 30 min at a speed of 250 r / min, and then the hydrophilic filter cotton material was used to adhere for 30 min. The content of the adhesive substance therein was determined using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 1.89 x 10 -1 mm 3 / mL, and the adhesion efficiency was calculated to be 40.68%.

[0039] Under the same conditions, combined adhesion was performed, and the hydrophilic material filter cotton and the hydrophobic material foam copper were respectively fixed to different rotors. First, the hydrophilic filter cotton material was used to adhere for 30 min, and the white water mixed with fine adhesive substances was aggregated and adhered to the surface of the material. Then, the hydrophobic foam copper material was used to adhere for 30 min, and the white water mixed with fine adhesive substances was aggregated and adhered to the surface of the material. The removal of the mixed fine adhesive substances can be achieved by replacing the adhesion material. Then, the content of the adhesive substance therein was determined using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 1.51 x 10 -1 mm 3 / mL, and the adhesion efficiency was calculated to be 52.48%.

[0040] The hydrophilic filter cotton material used in this example had a static contact angle of 68.85°, and the hydrophobic material foam copper had a static contact angle of 106.14°.

[0041] Example 2

[0042] The same batch of white water after filtration treatment in Example 1 was placed in the same container as in Example 1, and under the conditions of a temperature of 25°C and a speed of 500 r / min, the sample was taken, and the size and quantity of the mixed fine adhesive substance particles per unit volume of white water were detected, and the volume content of the fine adhesive substance per unit volume of white water was calculated to be 3.18 x 10 -1 mm 3 / mL.

[0043] Selective adhesion was performed using different hydrophilic materials, and the hydrophobic material was the same as in Example 1. The hydrophilic non-woven fabric was bound to the rotor and used alone, and under the conditions of a temperature of 90°C and a speed of 500 r / min, the mixture was stirred for 60 min. The content of the adhesive substance therein was determined using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 2.76 x 10 -1 mm3 / mL, the adhesion efficiency was calculated as 13.50%.

[0044] After the hydrophobic epoxy resin plate was fixed to the rotor for individual adhesion, the content of the adhesive substance therein was determined using a laser particle size instrument, and the content of the adhesive substance at this time was calculated as 2.1061 x 10 -1 mm 3 / mL, the adhesion efficiency was calculated as 33.77%.

[0045] The combined adhesion was performed, and all the materials were first fixed to the rotor. The hydrophilic non-woven fabric material was first used for stirring for 30 min at 500 r / min, and then the hydrophobic epoxy resin plate material was used for adhesion for 30 min. The content of the adhesive substance therein was determined using a laser particle size instrument, and the content of the adhesive substance at this time was calculated as 1.84 x 10 -1 mm 3 / mL, the adhesion efficiency was calculated as 42.13%.

[0046] The combined adhesion was performed, and all the materials were first fixed to the rotor. The hydrophilic non-woven fabric material was first used for stirring for 30 min, and then the hydrophobic epoxy resin plate material was used for stirring for 30 min. The fine adhesive substance in the white water was aggregated and adhered to the surface of the material. The removal of the fine adhesive substance could be achieved by replacing the adhesive material. Then, the content of the adhesive substance therein was determined using a laser particle size instrument, and the content of the adhesive substance at this time was calculated as 1.53 x 10 -1 mm 3 / mL, the adhesion efficiency was calculated as 52.19%.

[0047] The hydrophilic non-woven fabric material used in the example had a static contact angle of 58.67°, and the hydrophobic material epoxy resin plate had a static contact angle of 118.34°.

[0048] Example 3

[0049] The label paper with pressure-sensitive adhesive and the copy paper were prepared into a slurry according to a proportion, and then were screened. The dynamic water filter instrument with a 200-mesh filter screen was used to filter and recover the components such as fibers, fillers, etc. contained therein, to obtain a laboratory papermaking white water containing fine fibers, mixed fine adhesive substances and fillers, etc. At this time, the adhesive substances contained in the white water were ethylene-vinyl acetate copolymer and polyacrylate substances. Then, the white water was preheated. A part of the preheated white water was taken, and the content of the adhesive substance therein was determined using a laser particle size instrument as 8.60 x 10 -1 mm 3 / mL.

[0050] White water fine size stickies adhesion purification treatment: the white water after preheating is stirred and adhesion under the condition of 25℃ and 250r / min, the hydrophilic polyurethane material is fixed on the rotor and used alone, stirred and adhesion under the condition of 250r / min for 60min, the stickies content is measured by using the laser particle size instrument, the stickies content at this time is calculated as 6.23x10 -1 mm 3 / mL, the adhesion efficiency is calculated as 27.51%; the hydrophobic nylon net material is fixed on the rotor and used alone, stirred and adhesion under the condition of 250r / min for 60min, the stickies content is measured by using the laser particle size instrument, the stickies content at this time is calculated as 6.18x10 -1 mm 3 / mL, the adhesion efficiency is calculated as 28.09%.

[0051] Under the same condition, combined adhesion is carried out. All the materials are fixed on the rotor, the hydrophobic nylon net material is used first and adhesion under the condition of 250r / min for 30min, then the hydrophilic polyurethane material is used and adhesion for 30min, the stickies content is measured by using the laser particle size instrument, the stickies content at this time is calculated as 4.21x10 -1 mm 3 / mL, the adhesion efficiency is calculated as 51.08%; the hydrophilic polyurethane material is used first and stirred for 30min, the white water mixed fine size stickies is gathered and adhesion on the surface of the rotor; then the hydrophobic nylon net material is used and adhesion for 30min, the white water fine size stickies is gathered and adhesion on the surface of the material. The removal of the fine size stickies can be realized by changing the adhesion material. Then the stickies content is measured by using the laser particle size instrument, the stickies content at this time is calculated as 3.51x10 -1 mm 3 / mL, the adhesion efficiency is calculated as 59.14%.

[0052] The hydrophilic polyurethane material used in this example has a static contact angle of 60.12°, and the hydrophobic material nylon net has a static contact angle of 104.90°.

[0053] Example 4

[0054] Another batch of the white water after filtration treatment in example 3) is taken and placed in the same container, under the condition of 25℃ and 500r / min, the sample is taken, the fine size stickies particle size and quantity in unit volume of white water are detected, and the fine size stickies volume content in unit volume of white water is calculated as 8.60x10 -1 mm 3 / mL.

[0055] The different hydrophilic materials were used for selective adhesion, and the hydrophobic material was the same as Example 3. All the materials were first fixed to the rotor. First, the hydrophilic non-woven fabric material was used alone, and was stirred at a temperature of 90°C and a speed of 500 r / min for 60 min. The content of the adhesive substance in it was measured by using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 7.60 x 10 -1 mm 3 / mL, and the adhesion efficiency was calculated to be 11.63%. The hydrophobic nylon mesh material was fixed to the rotor and used alone, and was stirred at a speed of 1000 r / min for 60 min. The content of the adhesive substance in it was measured by using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 6.01 x 10 -1 mm 3 / mL, and the adhesion efficiency was calculated to be 30.17%.

[0056] The combined adhesion was carried out. All the materials were first fixed to the rotor. First, the hydrophobic nylon mesh material was used to adhere for 30 min at a speed of 1000 r / min, and then the hydrophilic non-woven fabric material was used to adhere for 30 min. The content of the adhesive substance in it was measured by using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 3.98 x 10 -1 mm 3 / mL, and the adhesion efficiency was calculated to be 53.72%. First, the hydrophilic non-woven fabric material was used to adhere for 30 min, and the fine adhesive substance in the white water was aggregated and adhered to the surface of the material. Then, the hydrophobic nylon mesh material was used to adhere for 30 min, and the fine adhesive substance in the white water was aggregated and adhered to the surface of the material. Then, the content of the adhesive substance in it was measured by using a laser particle size instrument, and the content of the adhesive substance at this time was calculated to be 3.61 x 10 -1 mm 3 / mL, and the adhesion efficiency was calculated to be 58.02%.

[0057] The hydrophilic non-woven fabric material used in this example had a static contact angle of 58.67°, and the hydrophobic material nylon mesh had a static contact angle of 104.90°.

[0058] As can be seen from the above examples, the removal efficiency of the adhesive substance treated by a single hydrophilic surface was 21.20%, and the average removal efficiency of the adhesive substance treated by a single hydrophobic surface was improved to 30.63%. This is similar to the research results summarized by Tang Yanan in his master's thesis "White Water Fine Adhesive Substance Destabilization Characteristics and Purification Research under the Action of Biological Enzymes".

[0059] If the hydrophobic surface treatment is used first and then the hydrophilic surface treatment, the average removal efficiency of the adhesive substance reaches 46.90%, which is increased by 25.7% compared with the average removal efficiency of the adhesive substance treated by the hydrophilic surface treatment alone and increased by 21.2% compared with the average removal efficiency of the adhesive substance treated by the hydrophobic surface treatment alone. However, it is also found by the present application that if the hydrophilic surface treatment is used first and then the hydrophobic surface treatment, the average removal efficiency of the adhesive substance is 55.46%, which is increased by 8.56% compared with the average removal efficiency of the adhesive substance treated by the hydrophobic surface treatment first and then the hydrophilic surface treatment, and increased by 34.26% and 24.83% compared with the average removal efficiency of the adhesive substance treated by the hydrophilic surface treatment and the hydrophobic surface treatment, respectively. Moreover, the overall adhesive substance removal efficiency of the present application is all above 52%, reaching 52-59%. It can be said that this is an unexpected improvement because, in the prior art, no matter how optimized and no matter what way is used to remove the fine adhesive substance in the papermaking white water, the single treatment (to the papermaking white water) is difficult to reach above 50%, especially after reaching a certain level of purification efficiency, it is difficult to further optimize. The method of the present application does not interfere with the chemical environment of the papermaking system, and after the fine adhesive substance removal efficiency of the papermaking white water reaches above 50%, the fine adhesive substance can be removed without stopping the machine, which can avoid repeated stopping of the production process to remove the fine adhesive substance in the papermaking white water, maintain normal production operation and stable product quality, ensure smooth operation of the papermaking system, fundamentally solve or alleviate the harm of the adhesive substance to production and product quality, avoid the extension of the cleaning period caused by the adhesive substance obstacle, and shorten the production period by 1-2 times compared with the prior art. Moreover, the method of the present application is simple in operation and low in cost, and has obvious advantages in production.

[0060] The protection scope of the present application is not limited by the above-mentioned embodiments, and any changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principles of the present application shall be equivalent alternative methods, which are all included in the protection scope of the present application.

Claims

1. A method for efficient purification of papermaking white water mixed fines and stickies based on ordered adhesion of hydrophilic / hydrophobic materials, characterized in that It comprises the following steps: 1) recovering fibers in papermaking white water to obtain papermaking white water containing mixed fine adhesives with particle size less than 100 μm, and fine fibers and fillers; the main components of the adhesives in the papermaking white water are ethylene-vinyl acetate copolymer, alkyl enone dimer, polyacrylate polymer and / or styrene-acrylate copolymer; 2) after the treatment in step 1), the papermaking white water is stirred and adhered by a rotor with surface coated and fixed with hydrophilic material at a temperature of 25-90 ℃ and a rotating speed of 150-1000 r / min for 15-60 min, and then stirred and adhered by a rotor with surface coated and fixed with hydrophobic material at a temperature of 25-90 ℃ and a rotating speed of 150-1000 r / min for 15-60 min, and the stirring and adhering cycle of the hydrophilic material first and then the hydrophobic material is repeated once or more times, so that the mixed fine adhesives in the white water are removed after adhering to the surfaces of the hydrophilic material and the hydrophobic material; the surface static water contact angle of the hydrophilic material ranges from 50° to 70°; the surface static water contact angle of the hydrophobic material ranges from 100° to 120°; the hydrophilic material is cotton fiber, hydrophilic polyurethane or non-woven fabric; and the hydrophobic material is foamed copper, polyester fiber or epoxy resin plate.

2. The method for high efficient purification of papermaking white water mixed microfines based on the ordered adhesion of hydrophilic / hydrophobic materials according to claim 1, characterized in that: The fibers in the recovered papermaking white water are recovered in the laboratory conditions by using a dynamic filter instrument, and in the production by using a multi-disc filter.

3. The method for high efficient purification of papermaking white water mixed microfines based on the ordered adhesion of hydrophilic / hydrophobic materials according to claim 2, characterized in that: The filter screen of the dynamic filter instrument is a standard screen, and the stirring speed is 200-1000 r / min; the filter screen of the multi-disc filter has a mesh range of 60-200.

4. The method for white water mixed fines purification based on hydrophilic / hydrophobic material ordered adhesion according to claim 1, characterized in that: The rotor is a symmetrical sheet, and the stirring and adhering mode is a convolute mode or a reciprocating mode.

5. The method for white water mixed fines purification based on the ordered adhesion of hydrophilic / hydrophobic materials according to claim 1, characterized in that The coating and fixing is to coat the entire rotor with the hydrophilic material or the hydrophobic material and then to fix it in a detachable manner.

6. The method for white water mixed fines purification based on hydrophilic / hydrophobic material ordered adhesion according to claim 1, characterized in that The number of the stirring and adhering cycle of the hydrophilic material first and then the hydrophobic material is 1-3.