JP4397925B2 - Processing method of powder waste - Google Patents

Description

  The present invention relates to a method for treating powder waste such as waste toner, EP ash (Electron Particle), and waste powder paint. In particular, the present invention relates to a method for treating powder waste that can prevent scattering of powder waste, thereby preventing contamination of peripheral facilities and deterioration of the working environment, and preventing dust explosion.

  Most of powder wastes such as waste toner, EP ash, and waste powder paint are disposed of in landfill or incinerated. However, treatment costs have risen due to a decrease in the number of incineration sites due to tighter remaining years at landfill sites and stricter exhaust gas regulations. In addition, when processing powder waste, powder may be scattered to cause contamination of peripheral equipment and work environment, or to cause dust explosion. Therefore, powder waste is avoided in landfills and incineration disposal sites due to the difficulty of processing, and high costs are required for processing.

  Under such circumstances, attempts have been made to produce solid fuel by suppressing generation of dust from powder waste having a high calorific value such as waste toner (Patent Document 1, Patent Document 2, Patent Document 3, Patent). Reference 4), since its manufacturing system is complicated, it has not been put to practical use.

In addition, a method of adding water to the powder in advance in order to prevent the powder from scattering is proposed (Patent Document 5). This method is effective for inorganic powder waste such as incinerated ash that easily gets wet with water, but cannot be expected for organic powder waste that is difficult to get wet with water such as waste toner and EP ash.
JP-A-5-295375 JP 2000-136263 A JP 2001-259598 A JP 2005-120112 A JP 2005-221090 A Japanese Patent No. 3039644

  In this way, waste toner, EP ash, waste powder paint, and other powder waste having a particle size of several μm to several hundred μm can be recycled as landfill, incineration, or solid fuel. When powder waste is put into the receiving facility for the prescribed treatment, the particle size is small, so the scattering of the powder waste causes contamination of the surrounding facilities and deterioration of the work environment. In the case of powder waste, there is a possibility of dust explosion due to electrostatic sparks. Therefore, it is considered difficult to treat these powder wastes, and the processing costs are higher than other wastes.

  In the present invention, when a powder waste having a particle size with severe scattering of several μm to several hundred μm is subjected to a predetermined treatment, An object of the present invention is to provide a method for preventing the scattering of bodily waste and further preventing the explosion of dust due to the ignition of electrostatic sparks or the like.

Processing method of powder waste of the present invention, the by injecting an aqueous surfactant solution towards from above the powder waste stored in the flexible container to the inner wall of the flexible container the powder waste flexible container It is characterized in that it is gradually wetted from the outer peripheral part in contact with the inner wall toward the central part, and then the wetted powder waste is put into a receiving facility.

  According to the present invention, powder waste having a particle size of several μm to several hundred μm, such as waste toner, EP ash, and waste powder paint, is recycled as landfill, incineration, or solid fuel. Prior to putting powder waste into the receiving facility for the prescribed treatment, etc., an appropriate aqueous surfactant solution according to the nature of the powder waste is sprayed onto the powder waste to dispose of the powder. Wet things. Thereby, since the scattering of the powder waste can be reduced when it is put into the receiving facility, it is possible to prevent the surrounding facilities from being contaminated and the working environment from being deteriorated, and further to prevent the dust explosion. As a result, powder waste can be treated in a simple and inexpensive manner.

  In this invention, it is preferable that the penetration time of the said surfactant aqueous solution with respect to the said powder waste is less than 24 hours. A surfactant aqueous solution that satisfies this condition has good wettability with respect to powder waste. By using such a surfactant aqueous solution, the powder waste can be efficiently moistened.

  In this invention, it is preferable to select the injection method of surfactant aqueous solution according to the kind of container in which powder waste is stored.

  For example, when powder waste is stored in a flexible container, drum can, etc., the surface activity from above the powder waste stored in the flexible container, drum can, etc. as a container toward the inner wall of the container It is preferable to spray the aqueous agent solution. Thereby, powder waste can be efficiently moistened with a small amount of a surfactant aqueous solution. Moreover, since the outer peripheral portion of the powder waste can be wetted, even if unwet powder remains in the central portion, the wetted powder of the outer peripheral portion wraps it, It is possible to greatly prevent powder waste from scattering and to prevent dust explosion.

  In this case, it is preferable that the surfactant aqueous solution is ejected using an ejection nozzle in which openings for ejecting the surfactant aqueous solution are formed only on the outer peripheral side surface. Thereby, it is possible to easily spray the surfactant aqueous solution toward the inner wall of the container, and the powder waste in the container can be efficiently wetted from the outer peripheral portion.

  When dropping the powder waste into the receiving facility and putting it in, it is preferable to spray the surfactant aqueous solution toward the powder waste that is falling. Thereby, since the mist of the surfactant aqueous solution captures the powder waste that has been scattered because it has not been wetted, the powder waste can be further prevented from being scattered.

  The powder waste is preferably waste toner, EP ash, or waste powder paint. Since these particles have a small particle size, powder scattering and dust explosion often become a problem. According to the present invention, this problem can be solved.

  The container is preferably a flexible container. Flexible containers are inexpensive and are widely used as containers for storing powder waste. Therefore, if the present invention is applied to the powder waste stored in the flexible container, the effect of the present invention is remarkably exhibited.

  The powder waste is preferably recycled as a raw material for auxiliary fuel for cement firing. Thereby, powder waste can be recycled at low cost as an auxiliary fuel for cement firing without deteriorating the working environment.

  In the present invention, the powder waste is preferably a powder having a particle diameter of several μm to several hundred μm, and is recovered from EP ash recovered from the electric dust collector of the heavy oil combustion facility, and recovered from the electric dust collector of the coal combustion facility. Used in electronic image forming devices such as fly ash, copiers and printers, and waste toner remaining in used toner cartridges, or waste toner generated in toner manufacturing factories, powder coating factories, or painting sites Examples thereof include waste powder paint generated from waste, waste activated carbon powder discharged from a deodorizing facility, and the like.

  Such powder waste processing is rarely performed at the place where it is generated, and is usually stored in containers such as flexible containers, drums, and bulk cars, and then transported to landfills or incineration sites for disposal. Or transported to a recycling plant to be recycled as fuel.

  The powder waste that has been stored in containers and transported to a disposal site or recycling plant is either put directly into the disposal site or recycling facility, or put into a storage facility and temporarily stored After that, it is thrown into a disposal site or a recycling facility.

  The process in which powder waste scatters and the facilities are contaminated, the work environment is deteriorated, and dust explosion occurs most frequently is the process in which the powder waste transported from the place of occurrence is first put into the receiving facility. Here, the “receiving facility” is a disposal site or facility in which powdered waste that has been carried in a container from the place of occurrence is first input. For example, a landfill or incineration of a landfill disposal site. It means a storage facility for temporarily storing incineration facilities, recycling facilities, or powdered waste before putting them into these.

  In the present invention, prior to performing the step of firstly putting the powder waste stored in the container and transported from the place of occurrence into the receiving equipment from this container (that is, the receiving step), the powder waste is converted into the powder waste. The powder waste is moistened by spraying an aqueous surfactant solution. If powder waste is moistened during the acceptance process, prevent powder waste from scattering in subsequent processes (for example, landfill process, incineration process, mixing process with other waste, etc.) Can do.

  In order to wet the powder waste efficiently, it is preferable to use an appropriate surfactant according to the properties of the powder waste. That is, the wettability of the surfactant aqueous solution with respect to the powder waste is preferably good.

The wettability can be confirmed by performing the following wettability test. A glass beaker with a capacity of 200 cm ³ is charged with 15 g of a predetermined aqueous surfactant solution, and then 30 g of powder waste is added. Then, the beaker is gently shaken several times to float on the aqueous surfactant solution. Place the beaker on a flat body waste top. The surfactant aqueous solution penetrates into the powder waste with time. The time until all the surfactant aqueous solution penetrates into the powder waste and the surfactant aqueous solution becomes invisible is measured, and this is taken as the penetration time. In the present invention, it is preferable to use a surfactant aqueous solution having a permeation time in this wettability test of less than 24 hours, more preferably less than 18 hours, and particularly less than 12 hours. It means that the shorter the permeation time, the higher the ability to wet the powder waste of the surfactant aqueous solution. If the permeation time exceeds the above upper limit, the ability to wet powder waste is low, and it is not preferable because the powder waste cannot be sufficiently scattered when the powder waste is put into the receiving facility. The surfactant to be used may be one kind or a mixture of plural kinds.

  The concentration of the surfactant in the surfactant aqueous solution is not particularly limited, but is preferably 0.1 to 20% by weight. In general, the higher the concentration, the shorter the penetration time, and the better the ability to wet powder waste. Therefore, when the concentration is less than the above range, it becomes difficult to obtain the wetting ability for the powder waste. On the other hand, when the concentration exceeds the above range, the cost of the surfactant aqueous solution increases, and the viscosity of the surfactant aqueous solution increases, which may deteriorate the permeability to powder waste.

  In the present invention, the type of the surfactant is not particularly limited as long as the permeation time in the wettability test of the surfactant aqueous solution satisfies the above conditions. For example, sodium alkylbenzene sulfonate, sodium alkyl ether sulfate, etc. Nonionics such as anionic surfactants, cationic surfactants such as alkyltrimethylammonium salts, zwitterionic surfactants such as sodium alkylamino fatty acid and alkylbetaine, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, etc. A surface active agent or the like can be used.

  In the present invention, it is preferable to appropriately select the method for injecting the surfactant aqueous solution to the powder waste according to the type of the container in which the powder waste is stored.

  When the container in which the powder waste is stored is a flexible container, as shown in FIG. 1, the flexible container 10 storing the powder waste 1 is suspended above the receiving facility 5 by, for example, a forklift 6. Move. At this time, the upper injection port of the flexible container 10 is opened, the injection nozzle 20 is inserted into the flexible container 10, and the injection nozzle 20 is applied to the powder waste 1 in the flexible container 10 with the upper input port closed. The surfactant aqueous solution 3 is sprayed using The injection nozzle 20 has a substantially columnar shape, and as shown in FIG. 2, the opening 21 for ejecting the surfactant aqueous solution is not formed on the tip surface (bottom surface), but on the outer peripheral surface near the tip surface. Only a plurality are formed. As shown in FIG. 3, the injection nozzle 20 is inserted into the flexible container 10 from the upper side, and the surfactant aqueous solution 3 is pumped to the injection nozzle 20 through the hose 22. The aqueous surfactant solution 3 is sprayed from above the powder waste 1 toward the inner wall of the flexible container 10.

  As the surfactant aqueous solution 3 is sprayed toward the inner wall of the flexible container 10, the powder waste 1 is in an outer peripheral portion (a hatched portion in FIG. 3) 1 a that is in contact with the inner wall of the flexible container 10. It gradually gets wet from the center toward the center. Thereby, the powder waste 1 can be efficiently moistened. Moreover, even if unwetted powder remains in the central portion 1b by wetting the outer peripheral portion 1a of the powder waste 1, the wetted powder of the outer peripheral portion 1a wraps around this. Therefore, when the powder waste 1 is thrown into the receiving facility 5 from the flexible container 10, the powder waste can be largely prevented from being scattered and dust explosion can be prevented.

  After spraying a predetermined amount of the surfactant aqueous solution 3 in the flexible container 10 as described above, the bottom portion of the flexible container 10 is cut with a blade, and the wet powder waste 1 is dropped into the receiving facility 5 and charged.

  The spray amount of the surfactant aqueous solution 3 varies depending on the quality and particle size of the powder waste 1, but is preferably 5 to 50% by weight with respect to the weight of the powder waste 1. If it is less than 5% by weight, the powder waste 1 cannot be sufficiently wetted. If it exceeds 50% by weight, the wet powder waste 1 becomes mud and adheres to the flexible container 10 and contaminates it. It is undesirable and at the same time uneconomical.

  Even if the surfactant aqueous solution 3 determined to be suitable in the above-described wettability test is used, for example, because the composition of the powder waste 1 in the flexible container 10 is slightly different between the upper part and the lower part, the powder is discarded. In some cases, the product 1 cannot be sufficiently wetted and the powder waste 1 cannot be completely prevented from being scattered. In such a case, as shown in FIG. 1, the spray nozzle 25 that is installed in the space between the suspended flexible container 10 and the receiving facility 5 falls from the flexible container 10 toward the receiving facility 5. It is preferable to spray the surfactant aqueous solution 4 in a mist toward the powder waste. Thereby, since the mist of the surfactant aqueous solution 4 captures the powder waste scattered because it is not wetted, the powder waste can be prevented from scattering. It is preferable to set the installation position and the number of the spray nozzles 25 so that the powder waste that is falling can be surrounded by the mist of the surfactant aqueous solution 4 from the periphery in the horizontal plane.

  The spraying of the surfactant aqueous solution 4 from the spray nozzle 25 is preferably continued during the time when the powder waste is falling from the flexible container 10. The spray amount per hour of the aqueous surfactant solution 4 is preferably 0.5 kg / min to 5 kg / min. If it is less than 0.5 kg / min, it may be difficult to prevent powder waste from scattering, and if it exceeds 5 kg / min, the effect of preventing powder scattering hardly changes, which is uneconomical.

  When the container in which the powder waste is stored is a drum can, as shown in FIG. 4, the top plate of the drum can 30 in which the powder waste 1 is stored is removed, and as in the case of FIG. The injection nozzle 20 shown in FIG. 1 is inserted into the drum 30 from above, and the aqueous surfactant solution 3 is pumped to the injection nozzle 20 via the hose 22 while covering the upper opening of the drum 30 and the injection nozzle 20 with a plastic sheet 31 or the like. To do. The aqueous surfactant solution 3 is sprayed from above the powder waste 1 toward the inner wall of the drum 30. Thus, as in the case of FIG. 3, the powder waste 1 is gradually wet from the outer peripheral portion (the hatched portion in FIG. 4) 1a in contact with the inner wall of the drum can 30 toward the central portion 1b. It becomes.

  After the injection, the plastic sheet 31 and the injection nozzle 20 are removed, and the drum can 30 is held using the rotary forklift 7 as shown in FIG. The powder waste 1 is dropped into the receiving facility 5 and put in. The means for transporting and overturning the drum can 30 is not limited to the rotary forklift 7, and for example, a drum overturning machine may be used.

  As in the case where the powder waste 1 is stored in the flexible container, the spray amount of the surfactant aqueous solution 3 varies depending on the quality and particle size of the powder waste 1, but the weight of the powder waste 1 The content is preferably 5 to 50% by weight. If it is less than 5% by weight, the powder waste 1 cannot be sufficiently wetted, and if it exceeds 50% by weight, the wet powder waste 1 becomes muddy and adheres to the drum 30, which is preferable. Not at the same time uneconomical.

  Similarly to the case where the powder waste 1 is stored in the flexible container, the powder waste 1 cannot be sufficiently wetted even if the surfactant aqueous solution 3 determined to be suitable in the wettability test is used. In some cases, scattering of the powder waste 1 cannot be completely prevented. In such a case, as shown in FIG. 5, the surfactant aqueous solution 4 is applied from the spray nozzle 25 installed in the space between the overturned drum can 30 and the receiving facility 5 toward the falling powder waste. It is preferable to spray in the form of a mist. Thereby, since the mist of the surfactant aqueous solution 4 captures the powder waste scattered because it is not wetted, the powder waste can be prevented from scattering. It is preferable to set the installation position and the number of the spray nozzles 25 so that the powder waste that is falling can be surrounded by the mist of the surfactant aqueous solution 4 from the periphery in the horizontal plane.

  The spraying of the surfactant aqueous solution 4 from the spray nozzle 25 is preferably continued during the time when the powder waste is falling from the drum 30. The spray amount per hour of the aqueous surfactant solution 4 is preferably 0.5 kg / min to 5 kg / min. If it is less than 0.5 kg / min, it may be difficult to prevent powder waste from scattering, and if it exceeds 5 kg / min, the effect of preventing powder scattering hardly changes, which is uneconomical.

  When the container in which the powder waste is stored is a storage tank of a bulk car, it is difficult to inject the surfactant aqueous solution onto the powder waste in the storage tank. Therefore, as shown in FIG. 6, an injection nozzle is provided between the discharge pipe 42 for discharging the powder waste from the storage tank 41 of the bulk vehicle 40 and the receiving facility 5 to spray the surfactant aqueous solution on the inner wall surface. A pipe 45 is installed. While spraying the surfactant aqueous solution from the spray nozzle of the pipe 45, the powder waste in the storage tank 41 of the bulk vehicle 40 is discharged by a method such as pneumatic feeding or a screw feeder. Thus, the powder waste is wetted by the surfactant aqueous solution when passing through the pipe 45.

  The inner diameter of the pipe 45 in which the injection nozzle is installed is preferably substantially the same as the inner diameter of the discharge pipe 42 of the bulk wheel 40. When the inner diameter of the pipe 45 is extremely smaller than the inner diameter of the discharge pipe 42, the transfer speed of the powder waste in the pipe 45 is increased, and it becomes difficult to sufficiently wet the powder waste. On the contrary, if the inner diameter of the pipe 45 is extremely larger than the inner diameter of the discharge pipe 42, the wet powder waste may stay in the pipe 45 and block the pipe 45.

  The length of the pipe 45 is appropriately set depending on the wettability of the surfactant aqueous solution to the powder waste, but 2 m to 10 m is preferable. If it is less than 2 m, the powder waste may not be sufficiently moistened depending on the discharge speed of the powder waste. In addition, if it exceeds 10 m, the efficiency of wetting hardly changes, and the possibility that the wet powder waste will block the pipe 45 increases.

  Although the number of injection nozzles for injecting the surfactant provided on the inner wall surface of the pipe 45 may be one, it is preferable that the number is plural. Providing a plurality of spray nozzles increases the chance of contact between the powder waste and the surfactant aqueous solution, so that the powder waste can be efficiently moistened. When installing a plurality of injection nozzles, it is preferable to arrange a plurality of injection nozzles 46 in a spiral on the inner wall surface of the pipe 45 as shown in FIG. Thereby, the powder waste which passes the inside of the piping 45 can be moistened uniformly. Although not shown in FIGS. 6 and 7, a hose for pressure-feeding the surfactant aqueous solution to the injection nozzle 46 is connected to the pipe 45.

  As in the case where the powder waste 1 is stored in a flexible container and a drum can, the spray amount of the surfactant aqueous solution varies depending on the quality and particle size of the powder waste 1, but the powder passing through the pipe 45 5 to 50 weight% is preferable with respect to the weight of the body waste 1. If it is less than 5% by weight, the powder waste 1 cannot be sufficiently wetted. If it exceeds 50% by weight, the wet powder waste 1 becomes mud and adheres to the inner wall surface of the pipe 45. Since it obstructs, it is not preferable. It is preferable to adjust the injection amount of the surfactant aqueous solution so that the ratio of the surfactant aqueous solution to the powder waste 1 falls within the above range according to the speed of the powder waste 1 passing through the pipe 45. .

  Similarly to the case where the powder waste 1 is contained in a flexible container and a drum can, the powder waste 1 cannot be sufficiently moistened even if the surfactant aqueous solution determined to be suitable by the wettability test is used. In some cases, scattering of the powder waste 1 cannot be completely prevented. In such a case, as shown in FIG. 7, the aqueous surfactant solution 4 is applied from the spray nozzle 25 installed in the space between the discharge pipe outlet 43 and the receiving facility 5 toward the powder waste falling. It is preferable to spray in the form of a mist. Thereby, since the mist of the surfactant aqueous solution 4 captures the powder waste scattered because it is not wetted, the powder waste can be prevented from scattering. It is preferable to set the installation position and the number of the spray nozzles 25 so that the powder waste that is falling can be surrounded by the mist of the surfactant aqueous solution 4 from the periphery in the horizontal plane.

  The spraying of the surfactant aqueous solution 4 from the spray nozzle 25 is preferably performed continuously during the time when the powder waste is falling from the discharge pipe outlet 43. The spray amount per hour of the aqueous surfactant solution 4 is preferably 0.5 kg / min to 5 kg / min. If it is less than 0.5 kg / min, it may be difficult to prevent powder waste from scattering, and if it exceeds 5 kg / min, the effect of preventing powder scattering hardly changes, which is uneconomical.

  As described above, the surfactant aqueous solution having good wettability with respect to the powder waste is jetted onto the powder waste by the jetting method according to the container for storing the powder waste. The wet powder waste is directly landfilled according to a predetermined processing procedure, incinerated, or mixed with other waste and recycled as fuel or the like. The powder waste wetted by the present invention and put into the receiving facility does not generate dust or cause dust explosion in the next processing (for example, recycling process).

  The method for recycling powder waste is not particularly limited, but can be recycled as a raw material for auxiliary fuel for cement firing, for example. In this case, it is preferable to impart reversible thixotropic properties to the cement firing auxiliary fuel, for example, by the method described in Patent Document 6. That is, when a plurality of wastes including powder wastes are mixed, water and oil contained in these wastes are emulsified, and calorific value and chlorine content are adjusted to produce auxiliary fuel for cement firing. Add reversible thixotropy to auxiliary fuel for cement firing.

  By adding reversible thixotropy to the auxiliary fuel for cement firing, the viscosity becomes extremely high in a stationary state such as during storage, so that sedimentation of solids contained in waste can be prevented, pipe transportation, spray combustion Since the viscosity is low when flowing, the pipe transportation and spray combustion can be easily performed.

  Presence / absence of reversible thixotropy and its degree are determined by measuring the viscosity using a rotational viscometer with the rotational speed of the rotor set to 6 revolutions / minute and 60 revolutions / minute, respectively, and comparing the values. It can be said that a composition having a viscosity at 60 revolutions / minute of 1/10 or less of the viscosity at 6 revolutions / minute has good thixotropic properties.

  When a plurality of wastes are mixed to produce a cement firing auxiliary fuel, reversible thixotropy can be imparted to the cement firing auxiliary fuel by mixing powder having a particle size of 10 μm or less. A good cement firing auxiliary fuel having reversible thixotropy can be produced by mixing powder waste having a particle size of 10 μm or less wetted by the present invention with other waste.

  Hereinafter, the present invention will be specifically described with reference to examples.

Example 1
As a wettability test, 15 g of a 1% aqueous solution of sodium lauryl sulfate (Emal 2FG manufactured by Kao Corporation) was placed in a glass beaker having a capacity of 200 cm ³ , and then 30 g of waste toner was added and the surface of the waste toner was shaken lightly. After flattening and standing for 8 hours, all the 1% aqueous solution of sodium lauryl sulfate permeated the waste toner.

  2 is opened, and the injection nozzle 20 shown in FIG. 2 is inserted into the flexible container, and the upper inlet is tied with a string to close the flexible container. As shown in FIG. 1, the forklift 6 lifts the flexible container 10 so that the bottom of the flexible container 10 is about 1 m above the upper surface of the powder receiving tank (receiving facility) 5. 30 kg of% aqueous solution was sprayed in about 1 minute.

After spraying, the bottom of the flexible container 10 was cut with a ceramic knife, and the wet waste toner was dropped into a powder receiving tank 5 equipped with a stirrer having a capacity of 30 m ³ and charged. At the time of charging, three spray nozzles 25 are provided between the flexible container 10 and the powder receiving tank 5, and a 1% aqueous solution of sodium lauryl sulfate from each spray nozzle 25 toward the falling waste toner is 1 kg / min. Sprayed at a rate to capture a small amount of waste toner dust.

  Waste toner is moistened with a 1% aqueous solution of sodium lauryl sulfate, and a small amount of waste toner dust generated during the fall is captured by spraying with a 1% aqueous solution of sodium lauryl sulfate to prevent generation of dust. Peripheral equipment was not contaminated, and of course no dust explosion occurred.

A total of 20 × 10 ³ kg of waste acetic acid and waste sodium hydroxide aqueous solution and about 10 × 10 ³ kg of dehydrated sludge obtained by dehydrating calcium fluoride sludge with a filter press are already put into the powder receiving tank 5. A slurry-like composition was obtained by continuing stirring while the toner was charged. 300 kg of waste toner moistened with a 1% aqueous solution of sodium lauryl sulfate was mixed with the composition that had already been charged about 5 seconds after the completion of the charging.

The above operation was performed 10 times, and a total of 3 × 10 ³ kg of waste toner was dropped into the powder receiving tank 5 from the flexible container 10.

A mixture consisting of 3 × 10 ³ kg of waste toner, a total of 20 × 10 ³ kg of waste acetic acid and waste sodium hydroxide aqueous solution, and 10 × 10 ³ kg of dewatered sludge became a uniform slurry.

The obtained slurry 5 × 10 ³ kg was put into a 15 m ³ biaxial paddle mixer, and 4 × 10 ³ kg of waste oil was added and stirred for 20 minutes. The calorific value and chlorine content of the resulting composition were obtained. The calorific value was 4100 kcal / kg, and the chlorine content was 520 ppm.

  When the viscosity of the slurry was measured using a single cylinder type rotational viscometer manufactured by Shibaura System Co., Ltd., type VS-A, it was 7,800 mPa · s at 6 revolutions / minute, and 750 mPa · s at 60 revolutions / minute. There was sufficient thixotropy.

  When the above composition was used as a fuel in a calcining furnace for cement firing, it burned well and there was no problem in the properties of the produced cement.

(Comparative Example 1)
As a wettability test, 15 g of groundwater was put into a 200 cm ³ glass beaker, then 30 g of waste toner was added, the beaker was lightly shaken to flatten the surface of the waste toner, and left to stand for 24 hours. Did not penetrate.

  To prevent dust explosion in a flexible container with a polyethylene inner bag containing 300 kg of waste toner, attach five ground wires, open the upper inlet, insert the injection nozzle 20 shown in FIG. 2 into the flexible container, After the upper inlet is closed by tying a string, the forklift 6 is used to close the flexible container 10 as shown in FIG. 1 so that the bottom of the flexible container 10 is about 1 m above the upper surface of the powder receiving tank (receiving facility) 5. It was lifted and 30 kg of groundwater was jetted from the opening 21 of the jet nozzle 20 in about 1 minute.

After spraying, the bottom of the flexible container 10 is cut with a ceramic knife, and the waste toner is dropped into a powder receiving tank 5 equipped with a stirring device having a capacity of 30 m ³ , and the waste toner is hardly wetted. Therefore, a large amount of dust was generated, soared to the vicinity of the ceiling with a height of about 5 m, fell on the peripheral equipment, and the working environment was extremely deteriorated. At the time of charging, three spray nozzles 25 are provided between the flexible container 10 and the powder receiving tank 5, and ground water is sprayed from each spray nozzle 25 toward the falling waste toner at a rate of 1 kg / min. The generated dust could hardly be captured.

(Example 2)
As a wettability test, 15 g of a 5% aqueous solution of polyoxyethylene sorbitan monolaurate (Reodol TW manufactured by Kao Corporation) was placed in a 200 cm ³ glass beaker, then 30 g of EP ash was added, and the beaker was shaken lightly to make EP ash When the surface was flattened and allowed to stand for 5 hours, 5% aqueous solution of polyoxyethylene sorbitan monolaurate all penetrated into the EP ash.

As shown in FIG. 6, a bulk vehicle 40 having a screw type discharge device loaded with 10 × 10 ³ kg of EP ash is installed in a management-type landfill site, and an inner diameter of 150 mm and a length of a discharge pipe 42 having an inner diameter of 150 mm are installed. A 5 meter long pipe 45 was connected. Ten injection nozzles 46 of the surface-active aqueous solution were provided on the inner wall surface of the pipe 45 spirally. The discharge pipe outlet 43 is installed on a bucket (receiving facility) 5 of a bucket loader having a bucket capacity of 1 m ³ , and a 5% aqueous solution of polyoxyethylene sorbitan monolaurate from each injection nozzle 46 is 0.02 × 10 ³ kg / min. EP ash was discharged at a rate of 0.15 × 10 ³ kg / min and charged into the bucket 5 while being injected at a rate of 0.15 × 10 ³ kg / min.

  The EP ash discharged from the discharge pipe outlet 43 was well wetted with a 5% aqueous solution of polyoxyethylene sorbitan monolaurate, and no dust was generated when it dropped into the bucket 5 of the bucket loader.

  EP ash well wetted with a 5% aqueous solution of polyoxyethylene sorbitan monolaurate placed in a bucket loader was put into a landfill site and rolled by a roller, but no dust was generated and compacted well. Was made.

(Example 3)
As a wettability test, 15 g of a 3% aqueous solution of polyoxyethylene lauryl ether (Emalgen 420 manufactured by Kao Corporation) was placed in a 200 cm ³ glass beaker, and then 30 g of waste powder paint was added and the beaker was shaken lightly to dispose of the waste powder. After the surface of the body paint was flattened and allowed to stand for 17 hours, all the 3% aqueous solution of polyoxyethylene lauryl ether penetrated into the waste powder paint.

  As shown in FIG. 5, a drum can 30 containing 70 kg of waste powder paint is held by a rotary forklift 7 above a solid waste receiving pit (receiving facility) 5, a top plate of the drum can 30 is removed, and the drum can 30 2 is inserted into the center of the drum can 30 from above, the upper opening of the drum can 30 is covered with a polyethylene sheet 31, and 14 kg of a 3% aqueous solution of polyoxyethylene lauryl ether is supplied from the opening 21 of the injection nozzle 20 into the inside. It sprayed in about 1 minute.

  After the injection, the injection nozzle 20 and the polyethylene sheet 31 were removed, the drum 30 was turned over 180 degrees using the rotary forklift 7, and the wet waste powder coating material was dropped into the solid waste receiving pit 5 and charged. At the time of charging, three spray nozzles 25 are provided between the drum can 30 and the receiving pit 5, and a 3% aqueous solution of polyoxyethylene lauryl ether is supplied from each spray nozzle 25 toward the falling powder coating material at 1 kg / min. A small amount of dust was collected from the waste powder paint.

  Waste powder paint is moistened with a 3% aqueous solution of polyoxyethylene lauryl ether, and a small amount of waste powder paint dust generated during dropping is collected by spraying with a 3% aqueous solution of polyoxyethylene lauryl ether. Generation was prevented, peripheral equipment was not contaminated, and naturally no dust explosion occurred.

  The waste powder paint wetted with a 3% aqueous solution of polyoxyethylene lauryl ether was mixed in the solid waste receiving pit 5 with the wood chips, waste paper, and waste plastic that had already been charged. These mixtures were put into an incinerator using an automatic charging device and incinerated, but no dust was generated in the mixing process with other waste and the charging process into the incinerator.

  The field of application of the present invention is not particularly limited, and can be widely used for the treatment of powder waste such as waste toner, EP ash, and waste powder paint.

FIG. 1 is a view showing a method for injecting a surfactant aqueous solution into powder waste when the powder waste is stored in a flexible container. FIG. 2 is a side view showing an injection nozzle for injecting an aqueous surfactant solution. FIG. 3 is a cross-sectional view showing a state in which a surfactant aqueous solution is sprayed onto powder waste stored in a flexible container. FIG. 4 is a cross-sectional view showing a state in which a surfactant aqueous solution is sprayed onto powder waste stored in a drum. FIG. 5 is a side view showing a state in which powder waste stored in a drum can is put into a receiving facility. FIG. 6 is a side view showing a state in which the powder waste stored in the storage tank of the bulk vehicle is put into the receiving facility. FIG. 7 is a side view showing a pipe provided with an injection nozzle for injecting a surfactant aqueous solution connected to a discharge pipe of a bulk vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder waste 1a Peripheral part 1b of powder waste Central part 3 of powder waste 3,4 Surfactant aqueous solution 5 Reception equipment 6 Forklift 7 Rotary forklift 10 Flexible container 20 Injection nozzle 21 Opening 22 Hose 25 Spray nozzle 30 Drum Can 31 Plastic Sheet 40 Bulk Car 41 Bulk Car Storage Tank 42 Discharge Pipe 43 Discharge Pipe Outlet 45 Pipe 46 Injection Nozzle

Claims (6)

A surfactant aqueous solution is sprayed from above the powder waste stored in the flexible container toward the inner wall of the flexible container to move the powder waste from the outer peripheral portion in contact with the inner wall of the flexible container to the central portion. A method for treating powder waste, wherein the powder waste is wetted gradually and then the wetted powder waste is put into a receiving facility.   The method for treating powder waste according to claim 1, wherein the penetration time of the surfactant aqueous solution into the powder waste is less than 24 hours.   The processing method of the powder waste of Claim 1 which injects the said surfactant aqueous solution using the injection nozzle in which the opening which ejects the said surfactant aqueous solution was formed only in the outer peripheral side surface.   The powder according to any one of claims 1 to 3, wherein the surfactant aqueous solution is sprayed toward the powder waste that is falling when the powder waste is dropped into the receiving facility. How to dispose of body waste.   The method for treating powder waste according to any one of claims 1 to 4, wherein the powder waste is waste toner, EP ash, or waste powder paint. The method for treating powder waste according to any one of claims 1 to 5 , wherein the powder waste is recycled as a raw material of auxiliary fuel for cement firing.

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