JPH0351389A - Pitch controlling agent and method for controlling pitch - Google Patents

Abstract

PURPOSE:To obtain the subject formulation, which is a reaction secondary aggregate of acid clay treated with an acid with an Al salt capable of remarkably reducing pitch of (waste paper) pulp by application thereof to white water treating steps by specifying oil absorption, average particle diameter and specific surface area thereof. CONSTITUTION:The objective formulation which is a reaction secondary aggregate of acid clay treated with an acid with an aluminum salt having >=75mol/100g oil absorption, <=2.5mum average particle diameter and >=140m<2>/g specific surface area. Furthermore, the aforementioned formulation is obtained by, e.g. adding 25.5kg water to 4.5kg activated clay having 82ml/100g oil absorption and 110m<2>/g specific surface area, stirring the resultant slurry in 15wt.% concentration at ambient temperature, then adding an aqueous solution of aluminum chloride with 10% Al2O3 content in an amount of 1.44kg expressed in terms of solid substance, stirring and reacting the resultant mixture for 1hr, drying and heat-treating the above-mentioned reaction product and pulverizing the heat-treated product.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pitch control agent and a pitch control method.

[Prior Art] Countermeasures against pitch troubles in pulp and paper manufacturing processes have been an important issue for a long time.

Pitch is a substance that inevitably gets mixed into paper mills, and is mainly brought in from wood chips, waste paper pulp, rosin sizing agents, etc., and some is removed from the system with wastewater, and some is also mixed into paper. The remaining waste is accumulated in the cooking, beating, and papermaking processes and circulated within the system.

Furthermore, aggregated pitch particles adhere to pulp processing equipment in each process, walls of pulp slurry storage chests, wire press rolls on paper machines, dryer rolls, blankets, canvases, etc., causing various troubles.

Conventional countermeasures include, for example, ■ Strengthening the seasoning of raw material wood, ■ Strengthening the cleaning of raw material pulp, ■ Selecting raw materials with low pitch, ■ Raw material system: suppressing foaming of white water systems, ■ Surfactants, water-soluble Polymer dispersants, starch, protective colloids such as gelatin, ethylenediaminetetraic acid (EDT)
A) Methods such as adding talc or the like to a mixer have been adopted.

In addition to the above, it has been known to use diatomaceous earth, silica, clay, bentonite, acid clay, and the like as pitch removers by adding them to pulp raw materials or white water systems.

None of the above-mentioned measures is a decisive factor in pitch control, and the development of effective pitch control methods is an urgent need for the industry as a whole.

[Problem to be solved by the invention: Problem S] The purpose of the present invention is to control the pitch by applying it to the manufacturing process of pulp and waste paper pulp, the paper manufacturing process, and the white water treatment process, in order to cope with the increase in pitch due to the deterioration of raw material quality in recent years. An object of the present invention is to provide an effective pitch control agent and pitch control method that can achieve the following.

Conventional pitch control was mainly based on the above-mentioned talc, but although the colloidal pitch in pulp slurry, which is thought to be the root cause of pitch problems, was reduced,
It was not possible to completely eradicate pitch troubles.

Talc has a three-layer crystal structure, but since it is based on magnesium silicate, it does not adsorb metal ions or water between the crystal layers like silica-alumina systems, but instead adsorbs lipophilic pitch on its relatively lipophilic surface. Although it has a smaller specific surface area than alumina, it is used as a pitch control agent.

The present inventors previously proposed a new pitch control agent and pitch control method in Japanese Patent Application No. 63-58504. This pitch control agent is a secondary reaction aggregate of acid-treated acid clay and aluminum salt, and has an oil absorption of 701R1/100g or more and a specific surface area of 1.
It has physical properties of 30 m/g or more. Since this pitch control agent is made by treating acid clay with an aluminum salt, it strengthens the attraction of charged pitch particles in water and uses a large specific surface area to enhance pitch control effects.

The present invention is based on experimental results showing that when two types of pitch control agents, talc and reactive secondary aggregates, are used together, the pitch control effect is higher and there is a synergistic effect than when each pitch control agent is added alone. This was done based on the following.

The present inventors originally thought that there are several types of pitch, and there are also differences in size, and that depending on the type of pitch control agent, there is selectivity in adsorption to pitch.

That is, it seems that there is a difference in the type of pitch adsorbed between the reaction secondary aggregate of the acid-treated acid clay and the aluminum salt and the talc.

Therefore, when both are used together, due to their synergistic effect,
We thought that the pitch control effect could be further enhanced.

Regarding the addition location of this pitch control agent,
In the bleached kraft pulp (BKP) manufacturing process, based on the knowledge that pitch accumulates and rapidly increases in the white water process in which white water circulates rather than in the pulp raw material, white water bits (■, ■) in Figure 2, waste paper processing In the process, the white water tank shown in Figure 3 (
■, ■).

The present inventors have completed the invention of a method for controlling the pitch of each process and final paper product by adding the pitch control agent of the present invention to the circulating white water of the pulp manufacturing process, paper manufacturing process, and waste paper processing process. It is something that

[Means for Solving the Problems] The present invention is a reaction secondary aggregate of acid-treated acid clay and aluminum salt, and has an oil absorption of 75M1/10.
09 or more, an average particle diameter of 2.5 am or less, and a specific surface area of 140-rlt/g or more.

Further, the present invention is a reaction secondary aggregate of acid-treated acid clay and aluminum salt, and has an oil absorption amount of 75aj/j/
1009 or more, an average particle size of 2.5 μm or less, and a specific surface area of 140 Td/g or more and talc with an average particle size of 5 μm or less in a ratio of 9:1 to 1:9. This is a pitch control agent with special characteristics.

Further, in the method of the present invention, in the papermaking process, a pitch control agent is added to high-concentration white water obtained by treating papermaking white water with a paper stock recovery equipment and recovering the paper stock, and the pitch control agent is not added to the papermaking stock. This is a pitch control method using a pitch control agent.

After further beating the pulp, it is diluted with fresh water or white water, and then in the process of adding chemicals and making paper, it is diluted with papermaking white water or high-concentration white water to which the pitch control agent of the present invention has been added, and it is made into paper as it is in the papermaking process. This is a pitch control method using the pitch control agent of the present invention.

Further, in the pitch control method using the pitch control agent of the present invention, papermaking white water or iX concentration white water to which the pitch control agent has been added is used for dilution when disintegrating and diluting the waste paper generated in the papermaking process.

Furthermore, in the pulp manufacturing process, a pitch control agent is added to the white water discharged after washing, dedusting, and dehydrating the pulp after cooking or bleaching, and the pitch of the present invention is recycled for use in the process of dedusting and dewatering the pulp. This is a pitch control method using a control agent.

In addition, in the waste paper processing process, the pitch control agent of the present invention is added to waste paper white water discharged after disintegrating, washing and dehydrating the waste paper, and recirculating the pitch control agent in the process of disintegrating, washing and dehydrating the waste paper. This is a pitch control method based on

Furthermore, in the waste paper deinking process, after adding the 1!121 agent, when the ink is floated and collected in the floatator, the waste paper pulp just before entering the floatator is subjected to the waste paper deinking final process in which a pitch control agent is added. This is a pitch control method using a pitch control agent according to the present invention, in which the pitch is diluted with white water generated in the process, and the pitch that floats together with the ink is discharged from the system using a floatator.

Furthermore, dilution with papermaking white water or high-concentration white water added with the above-mentioned pitch control agent, circulating use of pulp processing white water, circulating use of waste paper processing white water, dilution of waste paper pulp with white water generated in the final process of waste paper deinking, etc. This is a pitch control method using the pitch control agent of the present invention, in which the steps are performed in parallel at two or more locations.

Although it is not clear why the pitch control agent of the present invention is so effective, the following reasons may be considered.

In other words, there are several types of bitge, and
There is also a difference in size, and it is thought that there is selectivity in adsorption to pitch depending on the type of pitch control agent. It seems that there is a difference in the type of pitch adsorbed between the reaction secondary aggregates of acid-treated acid clay and aluminum salt and talc.

Therefore, when the pitch control agent of the present invention is used, each pitch control agent shares the adsorption of pitches with different properties, and it is considered that more pitches are controlled.

Furthermore, the reactive secondary aggregates in the pitch control agent of the present invention are characterized by a finer particle size than conventional ones, and therefore have a large specific surface area, which is thought to improve pitch adsorption.

Hereinafter, in each step, the place where the pitch control agent of the present invention is added and how to use it will be explained with reference to the drawings.

FIG. 1 is a schematic diagram of the flow of the preparation and papermaking process. In the papermaking process, the pitch control agent of the present invention is added to high-concentration white water (high-concentration white water CHEST shown in the figure) in which paper-making white water is treated with paper stock recovery equipment and paper stock is recovered to dilute pulp raw materials, etc. use.

Adding the pitch control agent to the highly concentrated white water involves blowing fine air bubbles into the white water, adsorbing and concentrating the pitch into the air bubbles, and floating the pitch together with the solid content, and adding the pitch control agent of the present invention to this white water mixture. The pitches that had been accumulating and rapidly increasing will be significantly reduced. The equipment used in this method is preferably a pressurized floating type cell, such as the Crofter Super Cell manufactured by US Machinery.

In the preparation process, as shown in the figure, after the pulp is beaten, sizing agents and other chemicals are added and sent to the papermaking process. Or use highly concentrated white water. In this case, the pitch control agent added to the white water is contained in the paper stock by diluting the paper stock, and is made into paper during the paper making process.

The papermaking white water or high-concentration white water to which the pitch control agent has been added is also used when disintegrating and diluting the waste paper generated during the paper making and finishing processes using the illustrated waste paper pulper.

FIG. 2 shows an example of applying the present invention to a pulp manufacturing process, and is a schematic diagram showing the flow of pulp processing of bleached kraft pulp (BKP).

The pitch control agent of the present invention is added to the white water bits discharged from the dehydrator ■ before bleaching and/or the white water bits discharged from the dehydrator ■ after bleaching, and the white water to which the pitch control agent has been added is screened and In the dewatering tank, it is used to dilute the pulp raw material, and controls the pitch by adsorbing pitch in white water and pulp.

FIG. 3 is a schematic diagram of the flow of a waste newspaper deinking process. In the waste paper processing process, the pitch control agent of the present invention is added to the waste paper processing white water that is discharged after disintegrating the waste paper, washing and dehydrating it (white water tank ■ shown in the figure), and disintegrating the waste paper.
It is used as circulating white water that is washed, dehydrated, and returned to the disintegrator.

In the waste paper deinking process, after adding a deinking agent to the waste paper raw material, the ink is floated and collected in a floatator. Just before entering the floatator, the ink is diluted with white water generated in the final process of deinking the waste paper pulp. However, the pitch control agent of the present invention is added to the white water (white water tank (2) shown in the figure) which is freshly generated in this sharp ink final step (dehydrator (2) shown in the figure).

Thereby, the pitch that floats together with the ink can be discharged from the system by the floatator.

As described above, the pitch control agent of the present invention is added to high-concentration white water obtained in the paper stock recovery equipment for white water in the papermaking process, and the pitch control agent of the present invention is added to the dilution of beaten pulp with white water or papermaking white water or Using high grade white water, adding the pitch control agent of the present invention to circulating white water in the pulp manufacturing process and waste paper circulating white water in the waste paper processing process, and for dilution before floatation in the waste paper ink process. The pitch control method using the pitch control agent of the present invention, such as using white water generated in the final deinking process to which the pitch control agent of the present invention has been added, can be applied to paper by performing these steps in parallel at two or more locations. It can be significantly effective in controlling pitch spots and pitch troubles in each process.

In the pitch control method using the pitch control agent of the present invention, the amount of the reaction secondary aggregate of the acid-treated acid clay (activated clay) and aluminum salt or the mixture of this and talc added to the white water in each of the above steps is as follows: It is sufficiently effective at 0.1 to 3% by weight based on the white water solid content (pulp). In reality, the amount added varies depending on the process, for example, 0.1 to 0.5% by weight in the pulp process, and 0% in the waste paper processing process.
A preferable removal effect can be obtained at 2 to 1% by weight.

In addition, since the pitch control agent of the present invention is added by 0.1 to 3 weights to the paper stock content in the white water, the amount used is 15% of the white water solid content to the pulp or paper stock solid content.
% for the fiber content of pulp or paper stock
．． 014 to 0.45% by weight, which is 17% compared to the amount of pitch control agent added to ordinary pulp raw materials.
A pitch control effect of about 10 can be achieved.

[Example] Next, the present invention will be explained in more detail with reference to Examples.

The test methods for Examples and Comparative Examples are as follows.

Size 22sX on hemastometer with colloidal pitch scale of 50μm
A 30 g cover glass was placed over the tube, and the white water was poured into the tube through a capillary tube from one end, and the number of colloidal pitches was counted at 800 times magnification using a microscope. This count number was divided by the number of squares counted to obtain the average number of colloidal pitches per square, and the number of colloidal pitches (P) per 1 CI3 was calculated from the following formula.

■ Average number of colloidal pitches per second square of PC d: Depth correction coefficient = 1.1 V Volume of liquid above second square The volume of liquid above second square is 0.1 am and μd in depth, so C13 Converted to a base area of 2500 Example 1 Pitch control agent W4 oil absorption 82ae/100 (II, specific surface area 110/
4.5 kg of activated clay was weighed out and 25.5 kg of water was added to obtain a slurry with a concentration of 15% by weight. 1.4419 (as solid content) of aluminum chloride aqueous solution (A1203 content 10%) was added to this slurry under stirring at air temperature, and after reacting with stirring for 1 hour, it was heated to 130°C using a blow dryer.
It was dried and heat treated at ℃ for 4 hours and allowed to cool. This reaction product was pulverized to obtain a secondary reaction aggregate (Ao). The oil absorption capacity of this reaction secondary aggregate (^°) is 120 m/1000, B E
The specific surface area determined by the T method was 180 m2/(1), and the average particle size was 1.8 μm.

Next, talc with an average particle size of 4 μm (oil absorption ffl 43d /
100 g, specific surface area 16 m/III") was prepared.

The pitch control agent of the present invention is a mixture of reaction secondary aggregate (8) and talc (B) at a predetermined ratio.

Separately, for comparison, the reaction secondary aggregate (Ao) was produced in exactly the same manner as the reaction secondary aggregate (Ao) except that the average particle size obtained by pulverization was 2.7 μm.
A reaction secondary aggregate (A) was obtained.

Unbleached kraft pulp before the pulp bleaching process shown in Figure 2 (
In the process of cleaning (containing 70% domestic softwood and 30% tropical hardwood) with Akebono, removing dust with a screen, sorting, and dehydrating with a dehydrator, the concentration of water discharged from the dehydrator was 0.
．． The reaction secondary aggregate of the present invention (
A mixture of Ao) and talc was applied to the pulp, and the white water to which the amount shown in Table 3 was added was used to dilute the pulp raw material in the screen and dehydrator.The colloidal pitch number of the pulp at the outlet of the dehydrator was measured. .

Example 2 Example 1 was carried out in exactly the same manner as in Example 1, except that only the reaction secondary aggregates of the present invention were added as shown in the table.

Comparative Example 1 The same procedure as in Example 1 was carried out except that talc was added in the amount shown in the table instead of the mixture of the secondary reaction aggregate (8°) and talc.

Comparative Example 2 The same procedure as in Example 1 was carried out except that the mixture of the secondary reaction aggregate (^°) and talc was not added.

Reference Example 1 Example 1 except that the reaction secondary aggregate (A) previously proposed by the present inventors was added instead of the mixture of the reaction secondary aggregate (Ao) and talc. I did it exactly the same way.

The test results of Example 1, Comparative Examples 1 and 2, and Reference Example 1 are shown in Table 1.

According to the results shown in the table, the removal rate of colloidal pitch of the pitch control agent of the present invention is significantly superior to that of the conventional pitch control agent talc, and the removal rate of colloidal pitch of the pitch control agent of the present invention is much higher than that of the conventional pitch control agent talc. It's better than that.

Further, the mixing ratio of the reaction secondary aggregate (Ao) and talc of the present invention is most preferably 1:1, and as the ratio of talc increases, the removal rate decreases.

Example 3 In the process of treating the bleached kraft pulp after the pulp bleaching process shown in Figure 2 with a washing machine, screen, and dehydrator, white water bits with a concentration of 0.02% discharged from the dehydrator were mixed with
A mixture of the reaction secondary aggregate (Ao) of the present invention and talc is applied to the pulp, and the white water added in the amount shown in Table 4 is used for diluting the pulp raw material in the screen and dehydrator. The colloidal pitch number of the pulp was measured.

Example 4 Example 3 was carried out in exactly the same manner as in Example 3, except that only the reaction secondary aggregate (^゛) of the present invention was added as shown in the table.

Comparative Example 3 In Example 3, except that talc was added as shown in the table instead of the mixture of the reaction secondary aggregate (Ao) and talc.
It was carried out in exactly the same manner as in Example 3.

Comparative Example 4 Example 3 was carried out in exactly the same manner as in Example 3, except that the mixture of the secondary reaction aggregate (Ao) and talc was not added.

Reference Example 2 The same procedure as Example 3 was performed except that the reaction secondary aggregate (A) previously proposed by the present inventors was added instead of the mixture of the reaction secondary aggregate (Ao) and talc. I did it exactly the same way.

The test results of Examples 3 and 4, Comparative Examples 3.4, and Reference Example 2 are shown in Table 2.

According to the results shown in the table, the removal rate of colloidal pitch of BKP of the pitch control agent of the present invention is significantly superior to that of talc, which is a conventional pitch control agent, and the reaction secondary aggregation rate proposed earlier by the present inventors It is improved over product (A).

Moreover, the mixing ratio of the reaction secondary aggregate (Ao) of the present invention and talc is most preferably 1:1, and as the ratio of talc increases, the removal rate decreases.

Example 5 A mixture of reaction secondary aggregates (Ao) and talc was applied to the white water tank (2) shown in the schematic diagram of the used paper processing flow in Figure 3 (relative to the white water solid content), and the m shown in Table 5 was obtained. and processed according to the illustrated flow to obtain deinked pulp (hereinafter abbreviated as finished IP).

Thereafter, the colloidal pitch number of the completed IR was measured in exactly the same manner as in Example 1.

In addition, as shown in Figure 3, the white water in the white water tank
After disintegrating the 80-weight portion (0%) and the 20-weight portion of the coated paper yarn using a pulper, they were dehydrated using a dehydrator ① and then discharged.

Example 6 The same procedure as in Example 5 was carried out except that only the reaction secondary aggregate (Ao) of the present invention was added in the amount shown in the table.

Comparative Example 5 The same procedure as in Example 5 was carried out except that talc was added in the amount shown in the table instead of the mixture of the reaction secondary aggregate (8°) of the present invention and talc.

Comparative Example 6 In Example 5, reaction secondary aggregates (A
The number of colloidal pitches of the finished iP obtained by treating it in the same manner as in Example 5 except that o) was not added was measured.

Reference Example 3 In Example 5, instead of the mixture of the reaction secondary aggregate (Ao) and talc, the reaction secondary aggregate (A) previously proposed by the present inventors was added with M shown in the table. was carried out in exactly the same manner as in Example 5.

According to the results shown in the test tables of Example 5゜6, Comparative Example 5゜6, and Reference Example 3, the colloidal pitch removal effect of adding the pitch control agent of the present invention to the white water tank ① in the waste paper processing process was as follows: It is far superior to talc, which is a conventional pitch II control agent.
This is improved from the previously proposed reaction secondary aggregate (A).

The mixing ratio of the reaction secondary aggregate (Ao) of the present invention and talc is most preferably 1:1, and as the amount of talc is increased, the removal rate decreases.

Example 7 The raw material mainly composed of old newspapers from Example 5 was subjected to normal deinking treatment in the processing system shown in the flow diagram in Figure 3, dehydrated in a dehydrator ■, and discharged as white water (white water) with a concentration of %. Tank■
), a mixture of the reaction secondary aggregate (Ao) of the present invention and talc is applied to the pulp (based on the solid content of white water), the provisions shown in Table 4 are added, and the white water is poured into waste paper pulp in front of a floatator. It was used to dilute the raw material to obtain the finished IR. Example 1 below
The colloidal pitch number of the completed IP was measured in exactly the same manner as above.

Example 8 Example 7 was carried out in exactly the same manner as in Example 7, except that only the reaction secondary aggregate (Ao) of the present invention was added in the m amount shown in the table.

Comparative Example 7 In Example 7, except that instead of the mixture of the reaction secondary aggregate (A") and talc, talc was added in m as shown in the table.
It was carried out in exactly the same manner as in Example 7.

Comparative Example 8 In Example 7, reaction secondary aggregates (A
The colloidal pitch number of the finished IR obtained by processing in exactly the same manner as in Example 7 except that the mixture of o) and talc was not added was measured.

Reference Example 4 In Example 7, instead of the mixture of the reaction secondary aggregate (Ao) and talc, the reaction secondary aggregate (A) previously proposed by the present inventors was added in m shown in the table. was carried out in exactly the same manner as in Example 7.

The test results of Examples 7 and 81, Comparative Examples 7 and 8, and Reference Example 4 are shown in Table 4.

According to the results shown in the table, the effect of removing colloidal pitch when the pitch control agent of the present invention is added to the white water tank (■) in the waste paper processing process is far superior to that of talc, which is a conventional pitch control agent, and is much better than the conventional pitch control agent, talc. This is an improvement over the secondary aggregate (A).

The mixing ratio of the reaction secondary aggregate (Ao) of the present invention and talc is most preferably 1:1, and as the amount of talc is increased, the removal rate decreases.

Example 9 Tropical hardwood chemical pulp, softwood chemical pulp, softwood mechanical pulp, and deinked waste paper pulp in a heavy ratio of 25:15:40:2
Further, 5 kg of rosin sizing agent/pulp t1 and 20 Ky of band sulfate/pulp t were added and mixed to prepare a pulp slurry having a concentration of 3% by weight.

This pulp slurry was diluted with clear water to a concentration of 1% by weight, stirred for 10 seconds at a rotational speed of 1100Orp, and then filtered through an 80 mesh wire while stirring at the same rotational speed. (hereinafter referred to as low-concentration white water, which corresponds to papermaking white water) was obtained. Add cationic polyacrylamide to this low-concentration white water at a rate of 1100p based on the white water solid content.
P was added, and pressurized water of 5K9/ci was blown into the water to form a coagulated and floated layer of pulp (3% m) on the top surface of the white water.
formed. This layer was skimmed off to obtain highly concentrated white water with a concentration of 3%.

The above-mentioned reaction secondary aggregates of the present invention (Ao
) and talc were added to the pulp solid content in amounts shown in Table 5 and stirred for 5 minutes.

Example 10 Example 9 was carried out in exactly the same manner as in Example 9, except that addition (1) of the mixture of the reaction secondary aggregate (Ao) of the present invention and talc was changed as shown in Table 5.

Comparative Example 9 Example 9 was carried out in exactly the same manner as in Example 9, except that the mixture of the reaction secondary aggregate (8') of the present invention and talc was added as shown in Table 5.

Example 11 Example 9 was carried out in the same manner as Example 11, except that only the reaction secondary aggregate (Ao) of the present invention was used in the amount shown in Table 5.

Comparative Example 10 In Example 9, talc (oil absorption matrix 40n+I/1
Example 9 was carried out in exactly the same manner as in Example 9, except that a specific surface area of 0.00 g and a specific surface area of 10 g/g was used.

Comparative Example 11 In Example 9, commercially available talc-based pitch control agent A (hereinafter abbreviated as commercial product A) (oil absorption fi471/1) was used instead of the mixture of the reaction secondary aggregate (8) of the present invention and talc.
The same procedure as in Example 1 was carried out except that a specific surface area of 0.00 g and a specific surface area of 16 g/g was used.

Comparative Example 12 Example 9 was carried out in exactly the same manner as in Example 1, except that the reaction secondary aggregate (Ao) of the present invention was not added.

Reference Example 5 In Example 9, the reaction was carried out in the same manner as in Example 9, except that the reaction secondary aggregate (A) was added instead of the mixture of the reaction secondary aggregate (Ao) of the present invention and talc. went.

The test results of Examples 9 to 11, Comparative Examples 9 to 12, and Reference Example 5 are shown in Table 5.

According to the results shown in the table, the pitch control agent of the present invention is significantly superior to conventional pitch control agents such as talc and talc-based commercial products (A). It is improved over aggregate (A).

Further, the amount of the mixture of the reaction secondary aggregate (8゛) and talc of the present invention added is preferably 2 kg per pulp;
Even if the amount is doubled, the removal rate will not improve much. On the other hand, if the amount added is too small, the removal effect will decrease, which is not preferable.

Example 12 In Example 1, high-concentration white water to which the mixture of the reaction secondary aggregate (A″) of the present invention and talc was added was added to the broken paper pulp slurry collected from the broken paper pulper in the paper making process shown in FIG. The solid content of white water is 15% of the solid content of broken paper pulp.
% and stirring for 5 minutes, the same procedure as in Example 1 was conducted.

Example 13 Completely the same as Example 12 except that only the reaction secondary aggregate (A゛) was added to ω shown in the table instead of the mixture of the reaction secondary aggregate (A゛) and talc. I went there.

Comparative Example 13 For comparison with Example 12.13, the procedure was carried out in exactly the same manner as in Example 12, except that the mixture of the reaction secondary aggregate (8°) and talc of the present invention was not added to the highly concentrated white water in Example 12. went.

Reference Example 6 In Example 12, the reaction secondary aggregate (A゛) of the present invention
and talc mixture, Moeki reaction secondary aggregate (8)
The same procedure as in Example 12 was carried out except that .

The test results of Examples 12.13, Comparative Example 13, and Reference Example 6 are shown in Table 6.

According to the results shown in the table, it is clear that colloidal pitch can be removed at a high removal rate by adding the pitch control agent of the present invention to highly concentrated white water for diluting the waste paper pulp slurry.

Example 14 The reaction secondary aggregation of the present invention shown in Example 1 was applied to circulating white water in the pulp manufacturing process of tropical hardwood unbleached chemical pulp, softwood unbleached chemical pulp, softwood mechanical pulp, and deinked waste paper pulp used as pulp raw materials. Material (A゛) and talc 1:
1 mixture was added to the pulp solid content, 2 kg each to the white water of chemical pulp and mechanical pulp, and 5 kg to the white water of waste paper pulp, and the white water was circulated (see Figures 2 and 3).

Next, after disintegrating and beating the tropical hardwood unbleached chemical pulp, softwood unbleached chemical pulp, softwood mechanical pulp, and deinked waste paper pulp, respectively, they were mixed at a ratio of 25:15:40:2o to form the reactive secondary agglomeration method of the present invention. After diluting the mixture of substance (A') and talc with 3% high concentration white water to which 2 Kt was added, filler (talc) 81/pulp t, rosin sizing agent 5 Ky/pulp t1, cationic polyacrylamide, 0
．． 5Ky/pulp t, 9/pulp t was added to sulfate band 40 to prepare pulp slurry, and this was mixed at a machine speed of 500 m/
The paper was made on a fourdrinier paper machine. The pitch area of the paper obtained by paper making was measured.

Note that high-concentration white water with a concentration of 3% to which a mixture of reaction secondary aggregates (8°) and talc was added was obtained as follows. In Fig. 1, papermaking white water with a concentration of 0.5% generated by a paper machine is led to a paper stock recovery equipment, 90 ppm of cationic acrylamide is added, and air is blown with a Crofter Super Cell (pressurized water 5 K'j/ci). The agglomerated floating layer of pulp (white water scum concentration: 3%) formed on the top surface of the white water with bubbles is collected into a high concentration white water chest equipped with a stirrer, and the reaction secondary aggregate of the present invention (8°) is collected therein. A mixture of talc and talc was added continuously to the pulp to give a total weight of 1 kg each.

Example 15 In Example 14, the reaction secondary aggregate (8゛) of the present invention
Pulp production white water, high concentration white water each 2 to 9/pulp t1
Paper was made in exactly the same manner as in Example 14 except that 5/(y/pulp was added to the waste paper treated white water), and the pitch area of the obtained paper was measured.

Comparative Example 14 In Example 14, the reaction secondary aggregate (A゛) of the present invention
Paper was made in exactly the same manner as in Example 14, except that the mixture of talc and talc was not added, and the pitch area of the obtained paper was measured.

Example 14. Example 15. The test results of Comparative Example 14 are
Shown in the table.

According to the results shown in the table, when the pitch control agent of the present invention is added to the circulating white water of the pulp manufacturing process, waste paper processing process, and highly concentrated white water of the papermaking process, and pitch control is performed in parallel in each of these processes, It is clear that a paper of superior quality with significantly reduced pitch than before can be obtained.

As mentioned above, the pitch control agent of the present invention has a much better pitch control effect than conventional pitch control agents. The pitch control agent of the present invention, especially the mixture of the reaction secondary aggregate (A') and talc, works effectively in the pulp and paper manufacturing process where pitches with different properties are present, and the addition location is also , preparation,
By adding it to white water, where pitch tends to increase significantly regardless of the paper making or waste paper processing process, it exhibits a synergistic effect of pitch removal of reaction secondary aggregates (A') and talc. When added to white water, the layer is much smaller than when added to pulp raw materials, and it is also unique in that it allows for effective pitch control.

[Effects of the Invention] As detailed above, the pitch control agent and pitch control method of the present invention can cope with the increase in pitch due to deterioration in raw material quality in recent years, such as the use of tropical hardwoods with a large amount of pitch or the increase in the use of waste paper pulp. It was made by

The PitchCon 1-roll agent of the present invention is a reaction secondary aggregate of an acid-treated acid clay and an aluminum salt.In particular, the average particle size is 2.5 μm or less, and the oil absorption and specific surface area are large. Talc alone or in combination with talc has much better pitch adsorption performance than conventional pitch control agents.

In addition, when using the pitch control agent of the present invention, it can be added to white water that is recycled and reused in the manufacturing process of pulp, deinked waste paper pulp, and white water treatment process. The reaction secondary aggregates and talc each adsorb the increased pitch of different properties in the white water and exert a synergistic effect, significantly reducing the pitch concentration during the pulp, waste paper pulp manufacturing process, and papermaking process. It is possible to improve the quality of pulp and paper by removing pitch of the resulting pulp and paper to a greater extent than when using conventional pitch control agents.

Therefore, the present invention provides an unprecedented pitch control agent and pitch control method that can significantly reduce pitch troubles in pulp and paper mills.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the flow of the preparation and papermaking process, Fig. 2 is a schematic diagram showing the flow of the pulp manufacturing process (bleached kraft pulp), and Fig. 3 is a schematic diagram showing the flow of the deinking process of used newspaper paper.

Claims (1)

[Scope of Claims] 1 A secondary reaction aggregate of acid-treated acid clay and aluminum salt, which has an oil absorption of 75 ml/100 g or more, an average particle size of 2.5 μm or less, and a specific surface area of 140 m ^
2/g or more. 2 Secondary aggregates produced by the reaction between acid-treated acid clay and aluminum salt, with an oil absorption of 75 ml/100 g or more, an average particle size of 2.5 μm or less, and a specific surface area of 140 m^
A pitch control agent comprising a mixture of 2/g or more of the reaction secondary aggregate and talc with an average particle size of 5 μm or less in a ratio of 9:1 to 1:9. 3. The pitch control agent according to claim 1 or 2, wherein the pitch control agent is added to highly concentrated white water obtained by treating papermaking white water with a paper stock recovery equipment and recovering the paper stock in the papermaking process, but is not added to the papermaking stock. pitch control method. 4 When disintegrating and diluting the waste paper generated in the paper making process,
3. The pitch control method using a pitch control agent according to claim 1, wherein papermaking white water or high concentration white water to which the pitch control agent has been added is used for dilution. 5. In the pulp manufacturing process, a pitch control agent is added to the white water discharged after cleaning, dust removal, and dehydration of the pulp after cooking or bleaching, and it is recycled in the process of removing dust and dewatering the pulp, as claimed in claim 1 or 2. A pitch control method using the described pitch control agent. 6. The pitch control according to claim 1 or 2, wherein in the waste paper processing process, a pitch control agent is added to the waste paper white water discharged after disintegrating the waste paper, washing and dehydrating the waste paper, and reusing it in the process of disintegrating, washing and dewatering the waste paper. Pitch control method using agent. 7 In the waste paper deinking process, after adding the deinking agent, when the ink is floated and collected with a floatator, the waste paper pulp just before entering the floatator is converted into white water generated in the final process of waste paper deinking with the addition of a pitch control agent. 3. The pitch control method using a pitch control agent according to claim 1, wherein the pitch is diluted with ink and the pitch floating with the ink is discharged from the system using a floatator. 8 Dilution with white water for papermaking or high-concentration white water added with a pitch control agent, circulation of white water for pulp processing, circulation of white water for waste paper processing, dilution with white water generated in the final process of waste paper deinking, in parallel at two or more locations. 9. A pitch control method using a pitch control agent according to any one of claims 3, 4, 5, 6, 7, or 8.