The method of processing of wastepaper pulp

 

(57) Abstract:

The invention relates to the processing of wastepaper pulp and can be used for the manufacture of tissue paper with a high absorption capacity and other types of securities. The technical result is the improvement of consumer properties of tissue paper. This technical result is achieved by a method of processing waste paper pulp, comprising the following operations. Initially, the processing of wastepaper pulp carry chemicals in the pulper at the stopped rotor. As chemicals used sodium hydroxide, sodium silicate, liquid soap and sintana at a given ratio of components and processing them hold for 3-5 min at 60-70oC. Then waste a lot dissolve within 35-40 min when the rotor and at the end of the dissolution in the bath add 3-4% hydrogen peroxide. 1 Il.

The invention relates to pulp and paper production and can be used for the manufacture of tissue paper with a high absorption capacity and other popular kinds of securities.

A method of processing wastepaper pulp obtained from waste papers which undergoes dissolution in the pulper, tub filled with water containing sodium hydroxide, water glass, sodium salt, diethylenetriaminepentaacetic acid and demurovoy acid. At the end of the dissolution in the bath is added to the hydrogen peroxide. The treated mass is fed to stage flotation is carried out at pH 6. Upon the dissolution of waste paper in a pulper tub, in addition to these chemicals, are injected surfactants, dissolution and flotation is carried out at a pH of 6.5 to 8.8. (Application 19718661, Germany, 1998. RJ. Technology and equipment for timber and pulp and paper production. Pulp and paper industry. - 2000. - 2. - S. 14).

There is a method allows one to obtain high-quality semi-finished product. Alkaline improvement increases boyhoodparadise properties of keratinous fibers wastepaper pulp. The addition of sodium silicate maintains the pH in the pulper.

However, the ratio of the dosage of surface-active substances (surfactants) and active components of the alkali treatment is insufficient, which leads to the secondary precipitation of particles of the dyes on the fiber; however, clogged pores, which ultimately leads to reduced absorption capacity of the final product.

Naevana paper, involves the initial processing of waste chemicals in the pulper at the stopped rotor for 30 min at a temperature of 40-50oWith as chemicals used caustic soda, sodium silicate, liquid soap and sintana, then the mass is diluted and additionally in the pulper serves peroxide and coagulant; the further process of dissolution and separation from fibers of paint particles produced when the rotor within 20-30 min (B. H. Smolyanitsky. Paper recycling. M: the Forest industry. - 1980. - S. 164-166).

This method allows you to reduce the cost of sanitary papers due to be used as improving agent caustic soda is a relatively cheap reagent. Sintana and liquid soap are used in small quantities (2%, 0.1% by weight of the fiber, respectively) and perform the role of a protective colloid, preventing re-deposition of particles of printing ink.

However, the known method of deinking wastepaper pulp is not possible:

to improve the absorption capacity of the sanitary tissue paper. Probably due to the fact that when data technological parameters increased elastic-wasteline reduce costs, as saving on chemicals is compensated by the increase in energy consumption due to a sufficiently long time of dissolution.

The aim of the invention is to increase the absorbency of wastepaper pulp for the manufacture of tissue paper with a high absorption capacity and other popular kinds of securities.

This goal is achieved by the fact that in the proposed method, the initial processing of wastepaper pulp as chemicals used sodium hydroxide in the amount of 2-3%, 2% sodium silicate, liquid soap and 0,08-0,09% cintanya. In this case, the processing of wastepaper pulp chemicals produced when the stopped rotor within 3-5 minutes at a temperature of 60-70oC. In a subsequent stage of processing waste mass is subjected to dissolution within 35-40 min when the rotor. At the end of the dissolution in the bath add 3-4% hydrogen peroxide.

Experimental studies to determine the absorbency (on the Terminal in accordance with GOST 12602) treated paper pulp from chemical consumption variation of the basic technological parameters. With the use of application packages Excel defined optimalise 10 - 12% compared with the equivalent.

With the proposed method, the processing of wastepaper pulp optimal ratio of regenerating reagent (NaOH), buffer (PA2SiO3), a protective colloid (liquid soap) and surfactants (sintana) enable you to fully regenerated cellulose fibers and fibers of wood pulp (the main components of the paper) for the re-formation of hydrogen bonds during the subsequent drying, and the active centers of the fibers do not absorb particles of printing ink, separated during processing, as this prevents evenly formed a layer of protective colloids. Elastic and viscous properties of the fibers are not greatly changed, that does not increase the stiffness of the paper.

Bleaching with hydrogen peroxide can increase the degree of whiteness, which improves the appearance of the final product.

An example implementation of the method.

Pre-sorted waste paper grades MS-1(1), MS-2(1), MS-3(1) and MC-10(1), GOST 10700-89, served in the pulper 2. The pulper pre-1/3 fill with hot water temperature 60-70oWith the tank 1. In the pulper, before loading paper, also add chemicals: sodium hydroxide in the amount of 2-3%, 2% sodium silicate, liquid is ASS="ptx2">

The pulping produced within 35-40 min, then the pump is pumped into the metal stock pool 3. At the end of the dissolution in the bath add 3-4% hydrogen peroxide. From the pool a lot served on dvuhkonechnaya trap from the slag 4, where under the action of centrifugal force from the mass of separated heavy inclusions, which are then collected in the bottom chamber of the trap and transported to the dump.

The pulp under residual pressure enters the pressure tank shakers 5, sorted mass sent to the stock tank 6, where it is diluted with fresh water, and the pump serves on flotation device for removing paint 7, the waste is transported to the dump.

On flotation installation also serves the fan air. When saturated air mass light paint particles float in the upper zone, through which the rotating scrapers collect to the center and through the Central part is removed from the stream and then sent to the sewer. Cleaned the mass is withdrawn from the lower part of the unit and through the stator flux, directed by gravity to the second stage subsidized cleaning 7, where the purified mass sent to the stock tank 8, and it is served in a bath of the thickener 9, where it is dewatered, washed from chemicals with the Yan washing - the thickener 9. The filtrate from the thickeners is discharged into the sewer, and the washed mass flows, by gravity, massin pool 11, whence it is directed to the mill-the trap 12. Waste dumped into the dump. From the mill mass delivered to the second stage of the grinding - cone mill 13, where it is then sent to the pulp pool 14.

Possible supply of parts hydrogen peroxide in the pulp pool 21. The need to supply the hydrogen peroxide is determined in the process of working out the technological regime, it is also possible to supply dye for tinting paper.

Ground mass from the pool 14 is fed into the tank regulation of concentrations of 15, consisting of several compartments, one of which serves a lot from the pump, the other paper machine circulating water from the pump (also provides for the supply of fresh water).

From the tank to regulate the concentration of mass flows, by gravity, stock tank 16, and from there to the conical cleaners 17, after which the purified mass collected in the reservoir and under the influence of the residual pressure serves to centrifugal sorting 19. Light waste from conical cleaners remove through the top of the cones and dumped into the tank waste 18. Heavy waste remove ctyroky by gravity in the stock tank 20, and the waste is directed into the sewer. From the tank 20 sorted mass served in the constant head tank (BNP) 21. From BNP mass at constant pressure and flow by gravity into the composition of the pool 22 and further to the headbox of the paper machine.

In contrast to the process, this method of making sanitary paper allows to obtain a final product with a high absorption capacity.

Mode deinking aimed at cleaning up the masses from all impurities, restoring boomgaarden properties of recycled fibers and improve the appearance of wastepaper pulp. To restore the elasticity of recycled fibers, hydrophilic and boomgaarden properties promotes alkaline processing at elevated temperatures.

This treatment has a greater impact on secondary fiber from wood pulp (newspaper, book and magazine paper) due to the effect of opening internal reserves the mechanical strength of the fibers.

Fiber wood pulp contain large amounts of lignin, which limits the swelling of the fibers, making them difficult plasticization and fibrillation, so by increasing the portion of the MC-10 in feedstock consumption Hey ability of wastepaper pulp on the ratio of chemicals, presented on the following diagram (see drawing).

1. Sodium hydroxide 3%, sodium silicate 2%, liquid soap 2%, sintana 0,09, hydrogen peroxide 4%, sintana 0,09%.

2. Sodium hydroxide 3%, sodium silicate 4%, liquid soap 2%, sintana 0,09% hydrogen peroxide 5%, fatty acid, and 0.5%, sodium polyphosphate 3%.

3. Sodium hydroxide 1% sodium silicate 2%, sintana 0,09% and alphona, hydrogen peroxide 0.5 to 1%.

4. Sodium hydroxide 2-3%, sodium silicate 2%, liquid soap 2%, sintana 0,08-0,09%, hydrogen peroxide 3-4%.

The chart shows that the proposed method of deinking and chemical reagents allow you to get a tissue with a high absorption capacity.

As proposed, the method of processing of wastepaper pulp to increase its absorbency, and other quality indicators for this application has not been studied.

Weight with increased absorptive capacity (as shown above), prepared by the claimed method can be used for the manufacture of tissue paper with a high absorption capacity and other popular kinds of securities.

The method of processing of wastepaper pulp, vitria, sodium silicate, liquid soap and sintana, in the pulper at the stopped rotor and the dissolution of the wastepaper pulp when the rotor using hydrogen peroxide, characterized in that the chemical treatment is carried out in 3-5 minutes at a temperature of 60-70oAnd the following chemicals: 2-3% sodium hydroxide, 2% of sodium silicate, 2% liquid soap and 0,08-0,09% cintanya, with subsequent dissolution of the wastepaper pulp for 35-40 minutes, in a bath add 3-4% hydrogen peroxide.

 

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