EA000264B1 - Method and apparatus for continuously preparing cellulose pulp - Google Patents

Abstract

1. A method for continuously preparing cellulose pulp, in particular for use in the chemical or paper industry, from a raw material consisting of textile fibres, characterized in that: separating the textile fibres from foreign matter, such as agricultural residues, metal or mineral particles; realizing densification of the textile fibers; continuously leaching and pre-cutting the textile fibres in a first processing machine (10)with two co-rotating screws(11, 12) to give a pulp with a dryness value of 25-40%; continuously leaching in a first dwell vessel (35), of latent period wherein the dwell time is of 30 to 60 minutes; continuously washing and bleaching the pulp in a second processing machine (40) with two co-rotative screws (41, 42) to give a pulp with a dryness value of 25-40%; continuously bleaching in a second dwell vessel (61), of latent period the dwell time is of 60 to 120 minutes.; diluting the pulp in a first dilution tank (62) to give the pulp with a concentration of value 1.5-3%; draining and pressing the cellulose pulp at the outlet of the first dilution tank (62) to give a pulp with a dryness value of 30-35%. 2. A method of Claim 1 characterized in that after draining and pressing the cellulose pulp at the outlet of the first dilution tank (62) and dilution is continued in the second dilution tank to give the pulp concentration with a value of 3 to 5%. 3. A method of Claim 2 characterized in that after second diluting the pulp is conveyed for storing in a reservoir, provided with an agitating means. 4. A method of Claim 1 characterized in that the first processing machine (10) comprises continuous and close to each other steps of the material transfer respectfully: step A of feeding said machine with textile fibres and mixing the textile fibres with water, injected into the machine at the beginning of this step; step B of compression; a primary step C of mixing and cutting; step D of conveying and treatment introducing at the beginning of the step leaching reagents and diluting water wherein the leaching reagents represent essentially a solution of caustic soda, consumption of which comprises a value of 2 to 5% of product reactivity in respect to the initial products; a second step of mixing and cutting; and a final step F of transporting and evacuation of the cellulose pulp into first dwell vessel (35) of the latent period. 5. A method of Claim 4 characterized in that water injected into the first processing machine (10) at the beginning of step A represents the water collected at draining and pressing the cellulose pulp and clear water. 6. A method of Claim 4 characterized in that at the end of step B compression recuperation of liquid residues is carried out. 7. A method of Claim 4 characterized in that between the outlet of the first processing machine (10) and the first dwell vessel (35) of latent period the cellulose pulp is maintained at a temperature, corresponding the temperature at the outlet from the first processing machine (10). 8. A method of Claim 1 characterized in that the second processing machine (40) comprises continuous and close to each other the steps of the material transfer respectfully: step G of feeding the bleached pulp fed from the first dwell vessel (35) of latent period and mixing this pulp with water, injected into this vessel at the beginning of this phase G; succession of steps H1, H2, H3 and H4 of compression, cutting and processing of the cellulose pulp; and step J of transportation and evacuation of the pulp into the second dwell vessel (61) of latent period. 9. A method of Claim 8 characterized in that water injected into the second processing machine (40) at the beginning of phase G represents the water collected at draining and pressing the cellulose pulp and clear water not earlier used in the technological process of pulp preparation. 10. A method of Claim 8 characterized in that the first H1 step of compression, cutting and treatment of the cellulose pulp comprises on one hand the first H11 step of compression and evacuation of liquid residues at the end of this phase and on the other hand the second step H12 of the pulp cutting. 11. A method of Claim 8 characterized in that the second H2 step of compression, cutting and treatment of the cellulose pulp comprises on one hand the H21 step of compression and introduction of the diluting water at the beginning of this phase and evacuation of liquid residues at the end of this phase and on the other hand the H22 step of cutting. 12. A method of Claim 8 characterized in that the third H3 step of compression, cutting and treatment of the cellulose pulp comprises on one hand the H31 step of compression and introduction of the diluting water at the beginning of this phase and evacuation of liquid residues at the end of this step and on the other hand the H32 step of cutting. 13. A method of Claim 8 characterized in that the fourth H4 step of compression, cutting and treatment of the cellulose pulp comprises on one hand the H41 step of compression with simultaneous introduction of the diluting water, solution of caustic soda the consumption of which correspondents to a value of 0.5 to 2% of reactive material in respect to the initial material, and solution of hydrogen peroxide he consumption of which correspondents to a value of 2 to 6% of reactive material in respect to the initial material and on the other hand the consumption of which correspondents a value of 0.5 to 2% of reactive material in respect to the initial material, the H42 step of cutting. 14. A method of Claim 1 characterized in that clear water is fed into each dilution tank (62, 69). 15. Apparatus for continuously preparing cellulose pulp in particular for use in the chemical or paper industry, from a raw material consisting of textile fibres, characterized in that: pneumatic means (2, 7) for conveying the textile fiberes; means of separating the textile fibres from foreign matter, such as agricultural residues, metal or mineral particles; a textile fibre densifier (6); means (8, 9) for extracting and filtering dust-laden air from the pneumatic means (2, 7) for conveying the textile fibres; a first processing machine (10) with two co-rotating screws (11, 12) for continuously leaching and pre-cutting the textile fibres to give a pulp with a dryness value of 25-40%; means (34) for conveying the cellulose pulp at a temperature, corresponding to its temperature at the outlet from the first processing machine (10); a first dwell vessel (35), of latent period for continuously leaching of the pulp, the dwell time of 30-60 minutes a second processing machine (40) with two co-rotative screws (41, 42) for continuously washing and bleaching the pulp to give a pulp with a dryness value of 25-40%; means (60) for conveying washed and bleached the cellulose pulp; a second first dwell vessel (61), of latent period for continuously leaching of the pulp, the dwell time of 60-120 minutes; a first dilution tank (62) with an agitator to give a pulp with a concentration value of 1.5-3%; a screw press (66) for draining and pressing the cellulose pulp o give a pulp with a dryness value of 30-35%; 16. Apparatus of Claim 15 wherein comprising after the screw press a second dilution tank with an agitator to give a pulp with a concentration value of 3-5%. 17. Apparatus of Claim 16 wherein comprising after the second dilution tank a storing tank with an agitator. 18. Apparatus of Claim 15 wherein the first processing machine (10) comprises continuous and close to each other steps of the material transfer respectfully: step A of feeding said machine with textile fibres and mixing the textile fibres with water, injected into the machine at the beginning of this phase; step B of compression with recuperation of liquid residues at the end of this steps; a primary step C of mixing and cutting; step D of conveying and processing, and introducing at the beginning of the step leaching reagents and diluting water wherein the leaching reagents represent essentially a solution of caustic soda, consumption of which comprises a value of 2 to 5% of product reactivity in respect to the initial products; a second step of mixing and cutting; and a final step F of transporting and evacuation of the cellulose pulp into first dwell vessel (35) of the latent period. 19. Process of Claim 18 wherein the water injected into the first processing machine (10) at the beginning of phase A represents the water collected at the outlet of the screw press (66) and clear water. 20. Process of Claim 15 wherein the second processing machine (40) comprises continuous and close to each other the steps of the material transfer respectfully: step G of feeding the bleached pulp fed from the first dwell vessel (35) of latent period and mixing this pulp with water, injected into this vessel at the beginning of this step; succession. of steps H1, H2, H3 and H4 of compression, cutting and processing of the cellulose pulp; and step J of transportation and evacuation of the pulp into the second dwell vessel (61) of latent period. 21. Apparatus of Claim 20 wherein the water injected into the second processing machine (10) at the beginning of step G represents the water collected at the screw press (66) and clear water. 22. Apparatus of Claim 20 wherein the first H1 step of compression, cutting and treatment of the cellulose pulp comprises the first H11 step of compression and evacuation of liquid residues at the end of this step and the second step H12 of the pulp cutting. 23. Apparatus of Claim 20 wherein the second H2 step of compression, cutting and treatment of the cellulose pulp comprises on one hand the H21 step of compression and introduction of the diluting water at the beginning of this step and evacuation of liquid residues at the end of this step and on the other hand the H22 step of cutting. 24. Apparatus of Claim 20 wherein the third H3 step of compression, cutting and treatment of the cellulose pulp com

Description

The invention relates to a method and installation for the continuous preparation of pulp, intended, in particular, for use in the chemical or pulp and paper industry. This cellulose pulp is prepared from raw materials, which are textile fibers, such as cotton fluff, flax, hemp or hemp, as well as jute.

For example, the method and installation in accordance with the invention provide the possibility of preparing in a continuous mode cellulose pulp intended for dissolution or use in the chemical industry, in particular, for the manufacture of viscose, paints, varnishes, terry cloth, nitrocellulose, etc.

Typically, cellulosic pulp, intended in particular for use in the chemical or pulp and paper industry, is made from wood-pulp starting material, most often wood.

At the same time, cellulose pulp can also be made from raw materials, which are cotton-like textile fibers, which allows to obtain products with excellent chemical and mechanical properties.

Such characteristics are required for the production of, for example, very high quality paper.

The present invention is the task of developing a method and technological installation for the preparation of pulp, intended, in particular, for use in the chemical or pulp and paper industry. This cellulose pulp is made from raw materials, which are textile fibers. The proposed method and installation provide the possibility of manufacturing in a continuous mode cellulose pulp without interruptions of loading in the technological line of preparation of the above-mentioned cellulose pulp and can significantly reduce the energy consumption, chemical reagents and water, usually necessary for the manufacture of such pulp.

This task according to the first aspect of the invention is solved by means of a method of continuous preparation of cellulose pulp, intended, in particular, for use in the chemical or pulp and paper industry, from raw materials, which are textile fibers. This method according to the invention is that

- textile fibers are separated from extraneous bodies, such as, for example, plant residues, metal particles or mineral particles;

- carry out the seal of the treated textile fibers;

- continuous bleaching and pre-cutting of textile fibers in the first processing machine with two jointly rotating screws to obtain a pulp with a dryness in the range from 25 to 40%;

- continue bleaching in the first tank of the latent period, and keep cellulose pulp in the first tank of the latent period for from 30 to 60 minutes;

- continuously carry out the washing and bleaching of cellulose pulp in the second processing machine with two jointly rotating screws to obtain washed and bleached pulp having a dryness in the range from 25 to 40%;

- continue bleaching in the second tank of the latent period, and keep the cellulose pulp in this second tank of the latent period for from 60 to 120 minutes;

- liquefy the cellulose pulp in the first tank liquefaction to obtain a pulp having a concentration in the range from 1.5 to 3%;

- carry out the drainage or thickening of the pulp and its pressing at the outlet of the first liquefaction tank to obtain cellulose pulp having a dryness in the range from 30 to 35%.

This task, according to another aspect of the invention, is achieved through an installation intended for the continuous preparation of cellulose pulp used, in particular, in the chemical or pulp and paper industry, from raw materials, which are textile fibers, which, according to the invention, contain:

- pneumatic transport means of textile fibers used in this case;

- a means of separating textile fibers and foreign bodies such as plant residues, metallic or mineral particles;

- device for sealing textile fibers;

- a means of removing and filtering dusty air from a pneumatic means of transporting textile fibers;

- the first processing machine with two co-rotating screws, designed for continuous bleaching and pre-cutting of textile fibers and obtaining cellulose pulp, having a dryness in the range from 25 to 40%;

- a means of transporting the pulp at a temperature corresponding to its temperature at the outlet of the first processing machine;

- the first capacity of the latent period, designed to continue the bleaching of pulp, and the time the pulp is kept in this first capacity of the latent period is from 30 to 60 minutes;

- a second processing machine with two co-rotating screws, designed for the continuous implementation of the washing and bleaching of the pulp and obtaining at the outlet the washed and bleached pulp having a dryness in the range from 25 to 40%;

- a means of transporting washed and bleached pulp;

- the second capacity of the latent period, designed to continue bleaching the pulp, and the time the pulp is kept in this second capacity of the latent period is from 60 to 120 minutes;

- the first tank of pulp liquefaction, equipped with a stirrer and intended to produce pulp having a concentration in the range from 1.5 to 3%;

- screw press designed for thickening and pressing of the pulp and thus obtaining a pulp having a dryness in the range from 30 to 35%.

Other characteristics and advantages of the invention will be clear from the following description of a variant of its implementation with reference to the accompanying drawings, where FIG. 1 is a schematic view of an installation for the continuous preparation of cellulosic pulp according to the invention;

FIG. 2 is a schematic sectional view of a vertical plane passing through the axis of rotation of one screw of the first processing machine;

FIG. 3 is a schematic sectional view along line 3-3 of FIG. 2;

FIG. 4 is a schematic sectional view along a vertical plane passing through the axis of rotation of one screw of the second processing machine;

FIG. 5 is a schematic sectional view along line 5-5 of FIG. four.

The process plant shown schematically in FIG. 1, successively comprises means 1 for opening bales or bales of textile fibers and means for cleaning these fibers, which may be, for example, cotton fluff, flax, hemp or hemp, as well as jute.

Textile fibers cleaned in this way are guided using a pneumatic conveying system comprising a fan 2, successively through a hub 3, a weighing system 4, a means 5 for separating textile fibers and metal particles and a compactor 6 for textile fibers, ensuring a constant density and uniform and controlled consumption of these textile materials. fibers needed to power the first processing machine 10, which is located along the process immediately behind the compactor 6.

This installation also contains between the means 5 for separating metal particles from textile fibers and a compactor 6 a second fan 7 for transporting these textile fibers and a fan 8 for removing dust from air associated with air filtration unit 9.

As can be seen in FIG. 2 and 3, the first processing machine 10 comprises two screws 11 and 12, which are rotatably driven around their axes by means of an engine and a gearbox, not shown in the drawings, inside the elongated chamber, forming the screw-covering pipe 15.

The screws 11 and 12 are provided with helical threads that are in engagement with each other, and the inner wall of the pipe 15 forms two intersecting cylindrical lobes, the inner diameters of which slightly exceed the outer diameters of the threads.

These threads are inserted into each other and the two screws 11 and 12 are rotated at the same speed and in the same direction in such a way that the two screws are identical, and their threads are simply offset from each other.

The screws 11 and 12 in the preferred embodiment of the invention are corrugated or grooved shafts 16 and 17, respectively (see FIG. 3), on which individual sections of this screw are strung.

The inner hole of these sections of the screw is provided with grooves corresponding to the grooves or grooves of the shaft, and their outer part is provided with a spiral thread, the pitch of which is different depending on the area in question to ensure the processing and transportation of material.

Thus, you can have a sufficiently large number of different sections of the screw, which allows you to change the screw pitch, thread depth, the number of different threads and the length of each zone.

The first processing machine 10 contains closely adjacent to each other from the beginning of this machine to its end in the direction of transportation of textile fibers, respectively:

- zone A supply of textile fibers having a dryness in the range from 92 to 95%, and mixing textile fibers with water supplied to the machine at the beginning of this zone A;

- zone B of compression of textile fibers with liquid waste disposal at the end of this zone B;

- the first zone C mixing and cutting textile fibers;

- zone D of transportation and processing with the introduction at the beginning of this zone chemical bleaching agents and thinning water;

- the second zone E mixing and cutting textile fibers;

- zone F of transportation and removal of pulp.

In the supply and mixing zone A, the pipe 15 has a supply hole 18, equipped with a bunker 19 in the inlet funnel connected with the outlet of the compactor 6 and the pipeline 13 for supplying recovered or clean water.

In this zone, screws 11 and 12 are provided with threads 20 with a wide pitch and reduced cross section in order to transport the material through this hole 18, which opens wide on both screws 11 and 12, and distribute the material into two threads 20.

Textile fibers and water are directly transported from the beginning to the end of this processing machine 10 and are mixed as a result of rotation and intermeshing of screws 11 and 12.

In zone B, screws 11 and 12 contain threads 21 with a reduced pitch and a thicker section so that their compression is added to the mixing of materials.

At the end of this zone B, where the compression is maximum, the liquid wastes from the washing are removed by means of filters 15a suitably installed in the pipe 15.

Then the material enters the first zone C of mixing and cutting.

To perform its functions, this zone C is provided with helical threads 22, the winding direction of which is opposite to the winding, ensuring the promotion of the material in the processing machine 10.

The threads 22 are made holes 23, which are in the radial direction up to the core of each screw 11 and 12 from the peripheral part of the threads. These holes are evenly distributed around the axis of each screw.

The screws 11 and 12 are adjusted in such a way that the two holes 23 periodically coincide in the central area of the engagement.

Thus, the passage of a given material consumption in the direction of its movement along this processing machine is controlled, which determines the braking of the material in this zone C and the effect of compression of the material in the previous zone.

At the same time, there is an intense cutting of the material, which leads to the homogenization of the mixture, improves the impregnation of textile fibers with water and also forms the first phase of the preparation of the half-mass and cutting of textile fibers.

In addition, cutting and blending textile fibers in Zone C, although to a lesser extent than in Zone B, lead to heating of the material, with much of the mechanical work being converted to thermal energy.

As a result, at the exit from zone C without any external supply of thermal energy, the material being processed acquires a temperature that makes it suitable for performing processing operations in the next zone of the machine.

Zone D of transportation and processing of the material is provided with threads 24, the pitch and thickness of which have characteristics close to the corresponding characteristics of threads of zone B.

At the beginning of the zone D, the pipe 15 is provided with an opening 25 connected to two pipelines 26a and 266, respectively, of supplying chemical bleaching agents and thinning water.

Bleaching reagents are, in particular, a solution of caustic soda, the consumption of which corresponds to a value in the range from 2 to 5% of the reactive product with respect to the starting material.

Each of the pipelines 26a and 266 is equipped with a metering pump 27a and 276, respectively.

Along the entire zone D textile fibers are mixed with reagents for the implementation of the technological stage of bleaching.

Such a processing machine with two co-rotating screws is especially well adapted for this operation.

Indeed, due to the rotation of the screws in the same direction, the material turns over in the area of mutual penetration of threads into each other, which turns out to be very effective in the sense of mixing and allows for close contact of reagents and textile fibers, which were soaked with water in the previous areas.

Thus, the best conditions for the use of reagents are provided, which is expressed, on the one hand, in their savings, and on the other hand, in the reduction in the subsequent phases of the amount of wash water and, accordingly, the amount of liquid waste to be treated.

Zone D of transport and processing of material passes into the second zone E of mixing and cutting, which, like zone C, is formed by spiral threads 30 with a winding direction opposite to that which ensures the progressive advance of the material being processed in this machine, i.e. counter-threading, and also contains passage holes 31.

Physical and thermal phenomena, as well as the functions implemented in this zone E, are similar to those in zone C, i.e. intensive cutting and mixing, as well as the preparation of a half-mass of textile fibers.

The last zone F contains the threads 32, the pitch and thickness of which are similar to the pitch and thickness of the threads in zone D.

The bleaching reaction continues during the advancement of the material in zone F, which, in addition, ensures the transfer of material in the direction of the outlet 33 in the rear end of the process 15 along the process.

At the exit of the first processing machine 10, the pulp has a dryness, the value of which lies in the range from 25 to 40%.

Bleached slurry exiting the first processing machine 10 is unloaded into the conveyance means 34, which is, for example, a screw elevator, which maintains the slurry at the temperature at which it leaves the first processing machine 10.

Thus, the bleached pulp is transported to the tank 35 of the latent period 35, the function of which consists mainly in continuing the bleaching reaction.

The holding time of the pulp in the tank 35 of the latent period has a value in the range from 30 to 60 minutes.

At the outlet of the latent period vessel 35, the pulp flows into the second processing machine 40.

This second processing machine 40 (see FIGS. 4 and 5) has a generally the same construction as the first processing machine 10 described above.

The second processing machine 40 comprises two screws 41 and 42, which are rotatably driven around their axes by means of an engine and a gearbox, not shown in the drawings, inside the elongated chamber forming the screw-covering pipe 45.

The screws 41 and 42 are provided with helical threads that are meshed with each other, and the inner wall of the tube 45 forms two intersecting cylindrical lobes, the inner diameters of which slightly exceed the outer diameters of the threads.

The threads are inserted one into the other, and the screws 41 and 42 are rotated at the same speed and in the same direction in such a way that the two screws 41 and 42 are identical, and the threads are simply offset from each other.

The second processing machine 40 contains closely to each other from its beginning to the end in the direction of transporting the material, respectively:

- zone G power bleached pulp coming from the tank 35 latent period, and mixing this pulp with water supplied to the machine at the beginning of this zone;

- a sequence of zones H1, H2, NC and H4 compression, cutting and processing of the pulp;

- zone J of transportation and removal of pulp after processing.

In the first zone G, the tube 45 has a special insertion hole 46, equipped with a funnel-shaped hopper 46a and designed to feed the processed materials to the machine.

For this, the hopper 46a is connected with the outlet of the latent period container 35 and with the pipeline 43 for supplying recovered or clean water.

In this zone G, the screws 41 and 42 are provided with threads 47 with wide pitch and reduced cross section in order to allow the transfer of products or materials introduced into the machine through the inlet 46, which opens wide on both screws 41 and 42 in order to distribute material on their threads.

The cellulose pulp and the first portion of wash water are thus directly transported along the length of the processing machine 40 in the direction of its output end and intermixed as a result of rotation and mutual engagement of screws 41 and 42.

The material then enters the first compression zone H1, cutting and processing the pulp.

The first zone H1 contains the first element H11 of the compression and washing zone and the second element H12 of the braking and cutting zone.

In the first element Hl 1 zones screws 41 and 42 contain threads 48 with reduced pitch and a thicker cross section than threads 47 of zone G.

Thus, pulp compression is added to the mixing of materials. Consequently, throughout the zone element H11, the pulp is vigorously mixed with the washing water introduced into the feed hopper 46a in order to eliminate residual reagents and products of the effect of these reagents on the pulp pulp.

At the end of the element H11 zone, where compression is maximum, the liquid waste pulp washing is removed using filters, appropriately placed in the pipe 45.

Element H12 zone is threaded. 49, the direction of winding or cutting which is reverse with respect to the direction of winding, ensuring the translational movement of the pulp along the machine 40 processing.

Holes 50 are made in these threads 49, which extend radially from the core of each screw 41 and 42 to the peripheral part of the thread and, moreover, are evenly distributed around the axis of rotation.

The screws 41 and 42 are adjusted in such a way that the two holes 50 periodically coincide with each other in the central engagement zone.

Thus, control is provided for the passage of the required flow rate of pulp along the processing machine, which determines the braking in this element of the H12 zone and the effect of compression in front of it.

At the same time, there is an intensive cutting of the pulp and its homogenization.

After the first zone H1, the pulp enters the second zone H2 of compression, cutting and processing, identical to the first zone H1. This second zone H2 contains, on the one hand, the first element H21 of the compression zone, and on the other hand, the second element H22 of the zone where the cutting takes place.

The first element H21 of the zone is similar to the first element H11 of the zone and contains threads 48 with reduced pitch, and the second element H22 of the zone is similar to the second element H12 of the zone and contains threads 49, the winding direction of which is reverse with respect to the direction of winding the thread, processing machine 40.

Holes 50 are made in these threads 49, which extend from the core of each screw 41 and 42 to the peripheral part of the thread.

At the beginning of the first element H21 of the zone, the pipe 45 is connected to the pipeline 52 for supplying wash water.

As a result, along the entire length of the first element H21 of the zone, cellulose pulp is mixed with diluting it with water to remove residual reagents and products of the effect of these reagents on the pulp.

At the end of this first element H21 of the zone where compression is maximum, the liquid waste from pulp washing is removed using filters appropriately placed in the pipe 45.

The third zone of NC compression, cutting and processing is identical to the first two zones H1 and H2 and contains, on the one hand, the first element of the NS 1 of the compression zone, and on the other hand, the second element of the H32 zone where cutting occurs.

In the first element NZ 1, the screws 41 and 42 contain threads 48 with reduced pitch, and in the second element H32, the screws 41 and 42 are provided with threads 49, the winding direction of which is opposite to the winding direction, which ensures the translational movement of the material in this processing machine 40 processing.

Holes 50 are made in these threads 49, which extend radially from the core of each screw 41 and 42 to the peripheral portion of the thread.

At the beginning of the first element NZ 1 zone pipe 45 is also connected to the pipeline 52 for supplying thinning water. As a result, throughout the first element of the NC 1 zone, the cellulose pulp is mixed with diluting water to remove residual reagents and products of the effect of these reagents on the pulp.

At the exit from the first element H31 of the zone where compression is maximum, the liquid waste from pulp washing is removed from the processing machine using filters 53, appropriately placed in pipe 45.

The fourth zone H4 of compression, cutting and processing contains, on the one hand, the first element H41 of the compression zone and, on the other hand, the second element H42 of the zone where the cutting takes place.

In the first element H41 of the zone, identical to the first elements H11, H21 and H31, screws 41 and 42 contain threads 48 in reduced pitch. The second element H42 of the zone is identical to the second elements of the H12, H22 and H32 zones and contains threads 49, the winding direction of which is reverse with respect to the winding direction, ensuring the translational movement of materials in this processing machine 40.

Holes 50 are made in these threads 49, which extend radially from the core of each screw 41 and 42 to the peripheral portion of the thread.

At the beginning of the first element H41 of the zone of the fourth zone H4, pipe 45 is connected to pipeline 54, which itself, in turn, is connected to three pipelines 55a, 556 and 55c (see Fig. 1), simultaneously supplying diluting water, caustic soda solution, flow rate which corresponds to a value in the range from 0.5 to 2% of a reactive product with respect to the starting material, and a solution of hydrogen peroxide, the consumption of which corresponds to a value in the range from 2 to 6% of a reactive product in relation to the starting material.

As a result, throughout the H4 zone, cellulose pulp is mixed with these bleaching reagents in order to provide the main stage in the production of cellulose pulp.

The processing machine described above with two co-rotating screws is particularly well suited for this process.

Indeed, due to the rotation of the screws in the same direction, there is a continuous turning of the material in the zone of mutual penetration of the threads into each other, which turns out to be very effective from the point of view of mixing and ensures close contact of the pulp with reagents.

Thus, the best conditions for the exposure of the reagents to the pulp are provided, which leads, on the one hand, to a saving of reagents, and on the other hand, to a decrease in the subsequent pulp processing phases of the need for washing water and, accordingly, to a decrease in the amount of liquid waste to be treated.

The last zone J of the second processing machine 40 is the zone of transportation and removal of cellulose pulp into the conveyor 60, formed, for example, by a screw elevator (as schematically shown in FIG. 1).

At the exit of the second processing machine 40, the pulp has a dryness in the range of 25 to 40%.

As can be seen in FIG. 1, the conveyor 60 supplies the pulp to the second tank 61 of the latent period.

The second tank 61 of the latent period is mainly intended to continue the bleaching reaction and the time it takes to keep this pulp in tank 61 has a value in the range from 60 to 120 minutes.

Then the pulp is reloaded into the dilution tank 62, equipped with a stirrer 63.

This liquefaction tank 62 is fed by pipeline 64 with water returned to the cycle, which is necessary to liquefy the pulp, the concentration of which at the outlet of the liquefaction tank 62 has a value in the range from 1 to 3%.

The cellulose pulp thus liquefied is fed by a pump in the direction of a screw press 66, which provides thickening and pressing of the pulp to achieve a dryness level in the range from 30 to 35%.

The liquid waste coming from the screw press 66 is collected by means of pipeline 67 in tank 68, from where some of this waste can be recycled to processing machines 10 and 40.

In accordance with a possible embodiment of the present invention, the thickened and pressed pulp pulp coming out of the screw press 66 is directed to the second liquefaction tank 69, also equipped with a stirrer 70 and fed with recycled water through the pipeline 71 to liquefy the pulp, the concentration of which is at the outlet of this the second tank 69 liquefaction has a value in the range from 3 to 5%.

In accordance with another possible embodiment of the invention, the pulp is then fed through a pump 72 to a storage tank 73 containing an agitator 74 designed to maintain the fibers in suspension.

As an example, the physical and paper (i.e. properties of paper made from this cellulose pulp) properties of cellulose pulp obtained using the method and installation in accordance with the invention from a certain amount of cotton fluff grown in Central Asia are given below.

Physical properties

Whiteness: 85% ISO.

Average fiber length: in the range of 1.5 to 6 mm.

The degree of contamination by inclusions: less than 3.5 mm ² / m ² '.

Alpha-cellulose coefficient: not less

98%.

Polymerization degree: variable from 650 to 3000 depending on the processing conditions.

Paper properties

Cleaning rate, ° SR 33 60 Density, g / m ² 70 70 Tensile strength, daN 6.5 7.5 Porosity CHEFFIELD SU 315 24 Tensile strength, mN 679 850

The analyzes were performed on the basis of cellulose pulp, previously refined using a PILE VALLEY apparatus. Using the method in accordance with the invention, the time of continuous preparation of cellulose pulp has a value in the range from 2 to 3 hours, while using traditional methods, this time exceeds 10 hours.

The method according to the invention requires the use of approximately 30 cubic meters of water per ton of pulp, while the traditional method requires from 100 to 150 cubic meters of water per ton of pulp.

Thus, the method in accordance with the invention allows to significantly reduce the amount of liquid waste to be treated, as well as significantly reduce the area occupied by this process unit.

The method in accordance with the proposed invention also allows for savings of 20 to 50% of the energy and chemical reagents used. This method allows to obtain cellulose pulp, which has constant and stable physical and mechanical properties.

Claims (26)

CLAIM 1. Method for continuous preparation of cellulose pulp, intended, in particular, for use in the chemical or pulp and paper industry, from raw materials, which are textile fibers, characterized in that: - Textile fibers are separated from foreign particles, such as plant residues, metal or mineral particles; - carry out the compaction of textile fibers; - continuous bleaching and pre-cutting of textile fibers in the first processing machine (10) with two jointly rotating screws (11, 12) to obtain cellulose pulp, having a dryness in the range from 25 to 40%; - continue bleaching in the first tank (35) of the latent period, and the retention time of the pulp in the tank is from 30 to 60 minutes; - continuously carry out the washing and bleaching of cellulose pulp in the second machine (40) processing with two jointly rotating screws (41, 42) to obtain washed and bleached pulp, having a dryness in the range from 25 to 40%; - continue bleaching in the second tank (61) of the latent period, and the retention time of the pulp in the tank (61) is from 60 to 120 minutes; - dilute the cellulose pulp in the first tank (62) liquefaction to obtain a pulp having a concentration in the range from 1.5 to 3%; - carry out the thickening and pressing of the pulp pulp at the outlet of the first tank (62) dilution to obtain a pulp with a dryness in the range from 30 to 35%. 2. The method according to π. 1, characterized in that after thickening and pressing of the pulp at the outlet of the first tank (62) of the liquefaction, the liquefaction of this pulp is again carried out in the second liquefaction tank to obtain a pulp having a concentration in the range from 3 to 5%. 3. The method according to p. 2, characterized in that after the second dilution of the cellulose pulp this pulp is sent to storage in a tank equipped with mixing means. 4. The method according to π. 1, characterized in that said first processing machine (10) contains continuously and close to each other from its beginning to the end in the direction of material advancement, respectively: - zone A of the power of this machine with textile fibers and mixing of textile fibers with water supplied to the machine at the beginning of this zone; - zone B compression; - the first zone C mixing and cutting; - zone D of transport and treatment with the introduction at the beginning of this zone of bleaching agents and thinning water, and bleaching agents represent, in particular, a solution of caustic soda, whose consumption corresponds to a value in the range from 2 to 5% of the reactive product relative to the starting material; - the second zone E mixing and cutting; - and the last zone F of the transport and disposal of the pulp in the first tank (35) of the latent period. 5. The method according to claim 4, characterized in that the water supplied to the processing machine at the beginning of the power zone A of the first treatment machine (10) is water collected in the process of thickening and pressing the cellulose pulp, and clean water. 6. The method according to claim 4, characterized in that at the end of the compression zone B, liquid waste is recovered. 7. A method according to any one of claims. 1, 4, characterized in that between the output of the first processing machine (10) and the first tank (35) of the latent period, the pulp is maintained at a temperature corresponding to its temperature at the outlet of the first processing machine (10). 8. The method according to π. 1, characterized in that the second processing machine (40) contains continuously and close to each other from its beginning to the end in the direction of material advance, respectively: - zone G for feeding bleached pulp from the first tank (35) of the latent period, and mixing this pulp with water supplied to this machine at the beginning of this zone G; - a sequence of Hl, H2, NC and H4 zones of compression, cutting and processing of cellulose pulp; - and the last zone J of transportation and removal of pulp into the second tank (61) of the latent period. 9. The method according to claim 8, characterized in that the water supplied to the machine at the beginning of the power zone G of the second processing machine (40) is water collected during the operations of thickening and pressing the pulp, and clean water that has not yet participation in this process of obtaining cellulose pulp. 10. The method according to claim 8, characterized in that the first H1 zone of compression, cutting and processing of cellulose pulp contains, on the one hand, the first phase H11 of compression, removing liquid waste at the end of this phase, and on the other hand, the second phase of H12 cutting pulp. 11. The method according to and. 8, characterized in that the second zone H2 of compression, cutting and processing contains, on the one hand, a phase H21 of compression with the introduction of thinning water at the beginning of this phase and with the removal of liquid waste at the end of this phase, and on the other hand, the phase H22 of cutting. 12. The method according to claim 8, characterized in that the third NC zone of compression, cutting and processing comprises, on the one hand, a phase H31 of compression with the introduction of diluting water at the beginning of this phase and removal of liquid waste at the end of this phase, and on the other side, phase H32 cutting. 13. The method according to and. 8, characterized in that the fourth H4 zone of compression, cutting and processing contains, on the one hand, the phase H41 of compression with the simultaneous introduction of a caustic soda solution at the beginning of this phase of diluting water, the flow rate of which corresponds to a value in the range from 0.5 to 2% reactive material with respect to the source material, and a solution of hydrogen peroxide, the flow rate of which corresponds to a value in the range from 2 to 6% of the reactive product in relation to the source material, and on the other hand, the phase H42 cutting pulp fibers. 14. The method according to π. 1, characterized in that in each tank (62, 69) dilution serves clean water. 15. Installation for the continuous preparation of pulp, intended, in particular, for use in the chemical or pulp and paper industry, from raw materials, which are textile fibers, characterized in that this installation contains: - pneumatic means (2, 7) of transportation of used textile fibers; - means (5) of separation from these textile fibers of foreign inclusions, such as plant residues, metal and mineral particles; - device (6) compaction of textile fibers; - means (8, 9) for removing and filtering dusty air from pneumatic means (2, 7) for transporting textile fibers; - the first machine (10) processing with two jointly rotating screws (11, 12), designed for the continuous implementation of bleaching and pre-cutting textile fibers and obtaining cellulose pulp, having a dryness in the range from 25 to 40%; - means (34) for transporting cellulosic pulp at a temperature corresponding to its temperature at the outlet of the first processing machine (10); - the first tank (35) of the latent period, designed to continue bleaching the pulp, and the holding time of the pulp in the tank (35) is from 30 to 60 minutes; - a second processing machine (40) with two jointly rotating screws (41, 42), designed for the continuous implementation of washing and bleaching pulp pulp and obtaining washed and bleached pulp, having a dryness in the range from 25 to 40%; - means (60) of transporting the washed and bleached pulp; - the second tank (61) of the latent period, designed to continue bleaching the pulp, and the holding time of the pulp in the tank (61) is from 60 to 120 min; - the first tank (62) of the cellulose pulp liquefaction, equipped with a stirrer (63) and intended to produce pulp having a concentration in the range from 1.5 to 3%; - and a screw press (66), intended for the implementation of the thickening and pressing of the pulp to obtain a pulp with a dryness in the range from 30 to 35%. 16. Installation according to claim 15, characterized in that it contains downstream, following the screw press, a second pulp dilution tank equipped with a stirrer and intended to produce a pulp having a concentration in the range from 3 to 5%. 17. Installation according to claim 16, characterized in that it contains downstream, following the second liquefaction tank, a cellulose pulp storage tank equipped with a stirring means. 18. Installation under item 15, characterized in that the first processing machine (10) contains continuously and close to each other from its beginning to the end in the direction of advancement of the processed material, respectively: - zone A of supplying textile fibers and mixing fibers with water supplied to this machine at the beginning of this zone; - zone B of compression with liquid waste recovery at the end of this zone; - the first zone C mixing and cutting; - zone D of transportation and processing of the material with the introduction at the beginning of this zone of bleaching reagents and thinning water, and these bleaching reagents are, in particular, a solution of caustic soda, whose consumption corresponds to a value in the range from 2 to 5% of the reactive product relative to the original material; - the second zone E mixing and cutting; - and zone F of the transport and disposal of cellulose pulp in the first container (35) of the latent period. 19. Installation according to claim 18, characterized in that the water supplied at the beginning of the zone A of the power supply of the first treatment machine (10) is water collected at the outlet of the screw press (66) and clean water. 20. Installation under item 15, characterized in that the second processing machine (40) contains continuously and close to each other from its beginning to the end in the direction of advancement of the processed material, respectively: - zone G supply bleached pulp pulp coming from the first tank (35) of the latent period, and mixing the pulp with water supplied at the beginning of this zone; - a sequence of Hl, H2, NC and H4 zones of compression, cutting and processing of cellulose pulp; - and the zone J of transportation and removal of pulp into the second tank (61) of the latent period. 21. Installation according to claim 20, characterized in that the water supplied at the beginning of the supply zone G of the second treatment machine (40) is water collected at the outlet of the screw press (66), or clean water. 22. Installation according to claim 20, characterized in that the first H1 zone of compression, cutting and processing contains the first element H11 of the compression zone with removal of liquid waste at the end of this zone and the second element H12 of the cutting zone. 23. Installation according to claim 20, characterized in that the second H2 zone of compression, cutting and processing contains, on the one hand, the first element H21 of the compression zone with the introduction of thinning water at the beginning of this first element H21 and with the removal of H21 at the end of this first element liquid waste, and on the other hand, the second element H22 of the cutting zone. 24. Installation according to claim 20, characterized in that the third zone NZ compression, cutting and processing contains, on the one hand, the first element H31 of the compression zone with the introduction of thinning water at the beginning of this first element H31 and with the removal of H31 at the end of this first element liquid waste, and on the other hand, the second element H32 of the cutting zone. 25. Installation according to claim 20, characterized in that the fourth zone H4 of compression, cutting and processing contains, on the one hand, the first element H41 of the compression zone with simultaneous introduction at the beginning of this first element H41 of thinning water, a solution of caustic soda, the flow rate of which corresponds a value in the range from 0.5 to 2% of a reactive product with respect to the starting material, and a solution of hydrogen peroxide, the consumption of which corresponds to a value in the range from 2 to 6% of a reactive product in relation to the starting material, and on the other side, the second element H42 cutting zone. 26. Installation according to claim 15, characterized in that each liquefaction tank (62, 69) is provided with a means for supplying clean water (64, 71).