JP2019184220A - Treated material drying method and drying apparatus - Google Patents

Abstract

To provide a method of drying a treated material and an apparatus for drying the same which allows a sludge treated material which contains copper or the like and has high moisture content and large bulk density.SOLUTION: A treated material inserted into a jacket 2 has moisture content of 30 - 70 mass %, cupper appearance quality of 5 - 50 mas %, and bulk density of .2 to 2.0 and is in a sludge state. The treated material is input into the jacket 2 at an input speed less than or equal to 1/3 of the rating, and is subjected to semi-drying until the treated material in the process of dry processing is hidden in height by an upper portion of a stirring blade 4to 4. After the semi-dried treated material is stored in the jacket 2 until the stirring blades 4to 4are hidden by the treated material, the treated material is input at an input speed of 80 - 100% of a rating input speed for drying. Thus, the treated material having the above properties can be dried in a desired state.SELECTED DRAWING: Figure 1

Description

  More specifically, the present invention relates to a drying method and a drying apparatus for a workpiece, and more specifically, a sludge-like workpiece that contains copper or the like, has a high moisture content, and has a large bulk specific gravity. The present invention relates to a drying method and a drying apparatus for an object to be processed.

  Since sewage sludge, human waste sludge, activated sludge, etc. have a large amount of water and become a problem in resource recycling and disposal, they are dried to reduce and recycle resources. In addition, thinned trees (= forest residual materials) that have been thinned for forest conservation have a high water content and cannot be used as biomass fuel. Applied. For drying such sludge and wood chips, for example, a band dryer, a band fluidized dryer, a box-type dryer, an octopus rotary dryer, a wedge-type dryer (also referred to as a “dryer with a stirring blade”), and the like. The dryer is used.

  Among various types of dryers, the wedge-type dryer has a wedge-type stirring blade (hereinafter simply referred to as “stirring blade”) that is a plurality of wedge-shaped rotary blades. Conductive heat transfer type dryer (conductive heat transfer type drying) that supplies heat medium such as hot water and oil and also supplies heat medium such as steam, hot water, and oil into the jacket of the dryer body. The processed product is dried by heat conduction from the rotating blades and the jacket. This wedge style dryer has 1: high thermal efficiency and high heat transfer coefficient, 2: large heat transfer area, small installation area, 3: low odor gas due to low air volume, 4: continuous processing Possible: 5: High stirring efficiency and few deposits, 6: Low running cost. In addition, there exists patent document 1, 2 regarding a conductive heat-transfer type drying apparatus, for example.

  The conductive heat transfer type drying apparatus shown in Patent Document 1 dries the object to be processed when the solvent and the solid resin are recovered from the object to be processed (a paste, gel, liquid or the like obtained by dissolving the resin with a solvent). On the other hand, the conductive heat transfer type drying apparatus shown in Patent Document 2 grinds and stirs wet materials with adhesive properties such as water and sewage sludge, and other particularly highly adhesive materials such as powders and granules. The drying is performed using the above-described heat medium or catalyst as a heat source.

JP 2013-170754 A JP 2014-9876 A

  The present inventors tried to dry a sludge-like object to be treated containing copper or the like, having a high moisture content and a large bulk specific gravity using a conductive heat transfer type drying apparatus as shown in Patent Document 2. The expected result was not obtained. According to the inventors' verification, when the sludge-like object to be treated is introduced and drying is started, casting occurs in the stirring blade, and the heat conduction from the stirring blade to the object is inhibited by casting. As a result, there was a problem that the drying rate was lowered. It was also found that when the drying speed decreases, semi-dried products with high moisture (water content of about 30 to 50%) increase in the jacket, resulting in a problem of overloading the motor that drives the stirring blades. . Such a problem is presumed that the object to be treated affects not the sludge, the woody chip, the papermaking sludge, or the like but the characteristic property of the sludge-like object to be treated containing metal. Therefore, even when a conductive heat transfer type drying apparatus as shown in Patent Document 1 is used, it is presumed that it is difficult to dry the sludge-like workpiece as described above, which the present inventor desires. Moreover, when the particle diameter of the to-be-processed object is small (for example, 1-100 micrometers), there existed a problem that it might be scattered after drying or there might be a lot of falling rocks and a conveyance defect might arise.

  Therefore, the present invention has been made in view of such a problem, and efficiently and longly treats a sludge-like workpiece containing a metal such as copper, having a high moisture content and a large bulk specific gravity. It is an object of the present invention to provide a drying method and drying apparatus for a workpiece that can be stably dried for a period of time.

  In order to solve the above problems, the present invention according to claim 1 is arranged such that at least two rotating shafts arranged in parallel to each other are arranged to be rotatable in opposite directions to each other, and the rotating shaft has a predetermined interval. A plurality of stirring blades are arranged, and the stirring blades attached to the rotating shaft on one side and the stirring blades attached to the other side are alternately arranged, and the jacket and the heat heated by the stirring blades are arranged. In a method for drying a sludge-like object to be processed by a stirring-type drying device that heats and drys the object to be processed by supplying a medium, the agitation-type drying of the sludge-like object to be processed is performed at a rate of 1/3 or less of the rated speed. It puts into the apparatus and performs semi-drying until the height position of the object being dried in the stirring-type drying apparatus is such that 80% or more of the length from the rotation center to the upper end of the stirring blade is hidden. With semi-drying process When the workpiece in the semi-dried state is stored in the stirring and drying apparatus to a height at which the stirring blade is hidden, drying is performed by feeding the workpiece at a rate of 80 to 100% of the rated speed. And a process.

  In order to solve the above-mentioned problem, the present invention according to claim 2 is the method for drying an object to be processed according to claim 1, wherein the rated input speed of the object to be processed is 3.0 to 5.0 wt / h. It is characterized by being.

  In order to solve the above problems, the present invention according to claim 3 is the method for drying an object to be processed according to claim 1 or 2, wherein the drying in the drying step is performed at 0.5 to 0.6 MPa inside. The stirring blade heated by introducing steam is rotated at 15 to 30 rpm.

  In order to solve the above-mentioned problem, the present invention described in claim 4 is the method for drying an object to be processed according to any one of claims 1 to 3, wherein heated air is introduced into the stirring-type drying apparatus. In addition, the inside of the conduit and the dust collector are kept warm by steam tracing at least before the dust collector and / or the dust collector that sends exhaust gas exhausted from the stirring-type drying device to the dust collector. It is characterized in that the inside of the inside does not fall below the dew point temperature.

  In order to solve the above-mentioned problem, the present invention according to claim 5 is the method for drying an object to be processed according to any one of claims 1 to 4, wherein the object to be processed after the drying is closed in a closed conveyor. It is characterized by being conveyed by.

  In order to solve the above-mentioned problem, the present invention according to claim 6 is the method for drying an object to be processed according to any one of claims 1 to 5, wherein the object to be processed has a water content of 30 to 70 mass. %, The copper grade is 5 to 50% by mass, and the bulk specific gravity is 1.2 to 2.0.

  In order to solve the above-mentioned problem, the present invention described in claim 7 is the method for drying an object to be processed according to any one of claims 1 to 6, wherein in the semi-drying step of the object to be processed, the object to be processed is dried. Semi-drying is performed so that the moisture content of the processed product is 20% by mass or more and less than 30% by mass.

  In order to solve the above problems, the present invention according to claim 8 is the method for drying an object to be processed according to any one of claims 1 to 7, wherein the particle diameter of the object to be processed is 1 to 100 μm. In the case, in the drying step, drying is performed so that the moisture content of the object to be processed is 15% by mass or more and less than 20% by mass.

  In order to solve the above problem, the present invention according to claim 9 is arranged such that at least two rotating shafts arranged in parallel to each other are rotatably arranged in opposite directions, and the rotating shafts have a predetermined interval. A plurality of stirring blades are arranged, and the stirring blades attached to the rotating shaft on one side and the stirring blades attached to the other side are alternately arranged, and the jacket and the heat heated by the stirring blades are arranged. In the stirring-type drying apparatus that heats and drys an object to be processed by supplying a medium, the upper end of the weir plate arranged in the jacket has a height of 80% or more of the length from the rotation center to the upper end of the stirring blade. In addition, it is characterized in that it can be discharged by overflowing the object to be processed after drying from the weir plate.

  In order to solve the above-mentioned problem, the present invention described in claim 10 is the stirring-type drying apparatus according to claim 9, wherein a heating air supply means for introducing heated air into the stirring apparatus, and an exhaust from the stirring apparatus. A conduit for sending the exhaust gas to the dust collector, and steam provided at least before the dust collector and / or in the dust collector so that the temperature inside the dust collector does not fall below the dew point temperature And a trace.

  In order to solve the above-mentioned problem, the present invention according to claim 11 is the drying apparatus for the object to be processed according to claim 9 or 10, wherein the conveying means for conveying the object to be processed after drying is hermetically sealed. It is characterized by that.

  According to the method for drying an object to be processed according to the present invention, a sludge-like object to be processed having a water content of 30 to 70% by mass, a copper quality of 5 to 50% by mass, and a bulk specific gravity of 1.2 to 2.0. After semi-drying at a feed rate of 1/3 or less of the rated feed rate, it was decided to feed and dry at a feed rate of 80-100% of the rated feed rate. During the stage of starting drying from the empty state and the subsequent stage of rated operation, it is possible to prevent the stirrer blade from sticking and to prevent the drive mechanism from being overloaded. is there.

  Further, according to the apparatus for drying an object to be processed according to the present invention, since the upper end of the weir plate is provided at a position higher than at least 80% of the length from the rotation center to the upper end of the stirring blade, This has the effect of preventing the casting from being prevented and drying and stirring and crushing can be efficiently performed by all the stirring blades, and can prevent the drive mechanism from being overloaded.

  Moreover, according to the drying method and drying apparatus of the to-be-processed object which concerns on this invention, while introducing heated air into the inside of a stirring type drying device so that the inside of a dust collector may not become below a dew point temperature, it collects exhaust gas. It is possible to prevent the operation from being impossible due to the wetness of the filter cloth of the dust collector because the dust collector is kept warm by steam tracing at least before the dust collector of the conduit to the device. There is an effect.

It is a plane sectional view showing an internal configuration in one embodiment of a drying apparatus of a processed object concerning the present invention. It is BB sectional drawing of the drying apparatus shown in FIG. It is a side view of a stirring blade. It is an enlarged view which shows the detail of the A section shown in FIG. It is explanatory drawing which shows the attachment angle of each stirring blade. It is explanatory drawing which shows the attachment angle of each stirring blade from an entrance side to the 5th sheet. It is a flowchart which shows one Embodiment of the drying method of the to-be-processed object which concerns on this invention.

[Configuration of Drying Device for Processing Object]
Hereinafter, a drying method and a drying apparatus for an object to be processed according to the present invention will be described in detail based on a preferred embodiment. FIG. 1 is a plan sectional view showing an internal configuration of an embodiment of a drying apparatus for an object to be treated according to the present invention, FIG. 2 is a sectional view taken along line BB of the drying apparatus shown in FIG. 1, and FIG. It is. A processing object drying apparatus (hereinafter simply referred to as a “drying apparatus”) 1 according to the present invention generally includes a horizontally long jacket (or casing) 2 that is horizontally disposed and an inside of the jacket 2. Two rotation shafts 3a and 3b arranged in parallel, and a plurality of rotation shafts 3a and 3b attached to each of the rotation shafts 3a and 3b (in this embodiment, 22 on the rotation shaft 3a side and on the rotation shaft 3b side). 23) stirring blades (wedges) 4 ( _4-1 to _4-45 ), driving mechanisms 5a and 5b which are driving sources of the rotating shafts 3a and 3b, and the rear end of the jacket 2 (right end in FIG. 1) And a support member 7 that supports the jacket 2.

Jacket 2 is for example made of metal, as shown in FIG. 3, section in line with the shape of the lower side agitating blade ₄ -1 _{to 4 -22} and stirring blade ₄ -23 _{-4 -45} has an arcuate While being formed in a substantially W shape, the inside is made into the sealing structure. As shown in FIG. 2, a workpiece inlet 2 a is provided at the upper portion of one end side (left side in FIG. 2) of the jacket 2, and a weir plate 6 is provided on the other end side (right side in FIG. 2). At the same time, a discharge port 2 e is provided on the top of the barrier plate 6. The upper height position of the weir plate 6 is higher than the height position of the stirring blade 4. Thereby, the semi-dried object to be treated is held in the jacket 2 until the upper part of all the stirring blades _4-1 to _4-45 is hidden at the beginning of the operation, so that the material is charged from the charging port 2a. The new object to be treated is prevented from coming into direct contact with the surface of the stirring blade 4 to prevent the casting from growing on the surface of the stirring blade 4. The upper height position of the weir plate 6 is 80% or more, preferably 95% or more of the length from the rotation center to the upper end of the stirring blades _4-1 to _4-45 , more preferably 95% or more. If the height which can be filled up to the height of the upper end can be secured, it is possible to prevent the growth of the surface of the stirring blade 4 from being cast. Further, the jacket 2 has a double structure, and a plurality of heating steam supply ports 2f and 2f are provided on both side surfaces of the jacket 2, and the heating steam is supplied from the heating steam supply ports 2f and 2f into the cavity of the jacket 2. To heat the drying of the object to be processed in the jacket 2. A plurality (three in FIG. 2) of drain discharge ports 2c and 2c are attached to the bottom of the jacket 2, and the drain after the heating steam supplied from the heating steam supply ports 2f and 2f is cooled is removed. It is designed to drain. Further, a heating air supply port 2b is provided in the vicinity of the discharge port 2e, and heating air introduced into the jacket 2 and steam generated when drying the object to be processed are disposed at an intermediate position on the jacket 2. An exhaust duct 2d (see FIG. 2) for leading to a dust collector (not shown) is connected. The exhaust duct 2d and a dust collector (not shown) are connected by a conduit (not shown), and a so-called steam trace is provided at least before the dust collector and in the dust collector. This is to prevent the inside of the drying device and a dust collector (not shown) from condensing due to the steam generated when the workpiece is dried. Note that the steam trace can be provided at least before the dust collector of the conduit or on either the dust collector. Steam trace prevents the temperature in the dust collector (not shown) from dropping below the dew point temperature. This is because when the temperature in the dust collector becomes equal to or lower than the dew point, the filter cloth of the dust collector becomes wet due to dew condensation, and the pressure loss due to the filter cloth rises rapidly and the operation becomes impossible.

The rotary shafts 3a and 3b are formed in a hollow shape so that heating steam (for example, heating steam of 0.5 to 0.6 MPa) can be introduced into the rotation shafts via the steam supply ports 2g and 2g. The heating steam introduced into the rotary shafts 3a and 3b is further introduced into the stirring blades _4-1 to _4-45 as will be described later. The workpiece is dried by contacting the workpieces with the rotating shafts 3a and 3b and the stirring blades _4-1 to _4-45 heated by the heating steam. The steam supply ports 2g and 2g are formed by rotary joints having a plurality of flow paths therein, and the heated steam introduced into the rotating shafts 3a and 3b and the stirring blades 4 _-1 to _4-45 is heated. The water generated by the exchange is drained again through the steam supply ports 2g and 2g. The dried object to be processed is discharged so as to overflow from a discharge port 2e provided at the upper portion of the dam plate 6, and is sealed through a discharge chute 2h (see FIG. 2), for example, a flow conveyor. It is comprised so that it may be carried out by. The reason for this is that when the particle size of the crushed and dried product is as fine as 1 to 100 μm, the dried product scatters or the amount of ore falling is extremely high when transported by an open conveyor such as a belt conveyor. This is because a conveyance failure may occur.

The rotary shafts 3a and 3b are pivotally supported at both ends by bearings. As shown in FIG. 6, the rotating shaft 3a rotates in the clockwise direction, and the rotating shaft 3b rotates in the counterclockwise direction. That is, the rotating shafts 3a and 3b are driven to rotate in opposite directions and at the same speed by the driving mechanisms 5a and 5b. As shown in FIG. 1, in this embodiment, the stirring blades 4 _-1 to _4-45 attached to the respective rotary shafts 3a and 3b and arranged in two rows have 22 rotary shafts 3a (4 _-1). ˜4 ₋₂₂ ), and the rotating shaft 3 b side is 23 (4 ₋₂₃ to _4-45 ). When viewed from the plane direction, the stirring blades _4-1 to _4-22 and the stirring blades _4-23 to _4-45 are arranged so as to partially overlap each other alternately at the center side of the jacket 2.

The stirring blades 4 _-1 to 4 _-45 have the same shape, and a pair of blade pieces 4 a and 4 b and blade pieces 4 c and 4 d formed in a disk shape by notches 8 and 8 in two portions of the disk shape. It is formed with. The wing pieces 4a to 4d have a hollow structure inside, and the heating steam introduced into the rotary shafts 3a and 3b is introduced into the inside and heated. Further, as shown in FIG. 5, the blade pieces 4a to 4d have a tapered shape in which the rotation direction side end portion is thick and the rotation direction opposite side end portion is thinned, thereby increasing the crushing and stirring force of the workpiece. It can be shaped. Further, as shown in FIG. 3, the stirring blades 4 _-1 to _4-22 are arranged so that two blade pieces 4a and 4b are opposed to each other on the same circumference on the rotating shaft 3a side. _{Each of the} blades _4-23 to _4-45 has a configuration in which two blade pieces 4c and 4d are arranged opposite to each other on the same circumference on the rotating shaft 3b side. The wing 4a~4d impellers 4 _-1 to 4 _-45 to different positions so that the position provided with the cutout portion 8 does not overlap the predetermined number as viewed from the axial direction (four in this embodiment) Has been placed.

  An auxiliary wing 20 is attached to the outer edge portion forming the notch portion 8. The auxiliary blade 20 crushes the processed material so that the dried product does not harden, and sends the processed material to the outlet side or returns it to the inlet side to hold the processed material in the jacket 2 for a predetermined time. And provided to promote drying. The auxiliary wing 20 is a rear end side in the rotational direction of the notch 8 formed in the wing pieces 4a to 4d as a pair of substantially L-shaped auxiliary wing pieces 20a and 20a formed by bending a metal plate member at 90 °. The outer peripheral portion of the edge portion is attached to the auxiliary wing mounting seat 12 provided at the outer peripheral edge by being fixed by bolts and lock nuts (not shown). And the auxiliary wing | blade 20 is each attached with the predetermined inclination | tilt angle (theta) with respect to the plate | board surface of blade piece 4a-4d.

In the case of this embodiment, the attachment angles of the blade pieces 4a to 4d to the rotary shafts 3a and 3b are as shown in FIG. Until 5 th of the stirring blade ₄ -1 _{to 4 -5} to the rotary shaft 3a in FIG. 6, and, for each wing 4a~4d to 5th stirring blade ₄ -23 _{-4 -27} to the rotary shaft 3b The mounting angle is shown. Then, in the rotary shaft 3a side, stirring blade ₄ -1 15 ° from _{-4 -4} wing 4a~4d horizontal position (9 o'clock) the counterclockwise direction, 60 °, 105 °, that 150 ° shifting the angle attached to, stirring blade ₄ -5 _{to 4 -22} is the repetition of the attachment of the stirring blade ₄ -1 _{to 4 -4.} On the rotating shaft 3b side, the blade pieces 4c and 4d of the stirring blades _4-23 to _4-26 are shifted in the clockwise direction from the 12 o'clock position to 15 °, 60 °, 105 °, and 150 °. The agitating blades _4-27 to _4-45 are repeatedly attached to the agitating blades _4-23 to _4-26 . As described above, since the attachment directions of the auxiliary blades 20 are different from each other, the workpiece is sufficiently crushed and stirred, and the workpiece is sent from the inlet 2a side to the outlet 2e and returned to the opposite side. The action of the stirring blade 4 to be applied is further assisted. The auxiliary feeding blade 20 can be appropriately selected in accordance with the degree of adhesiveness of the material to be dried and the like, as appropriate, with an optimal size, shape, inclination angle, and the like.

The drive mechanisms 5a and 5b have the same configuration corresponding to the rotation shafts 3a and 3b, respectively. Here, the configuration of the drive mechanism 5a on the rotary shaft 3a side will be described. As shown in FIG. 2, a motor 5a- ₁ that is a drive source, and a speed reducer 5a- ₂ that adjusts the number of rotations of the motor 5a- _1. The transmission member 5a- ₃ that transmits the rotational output of the speed reducer 5a- ₂ to the rotary shaft 3a is provided.

The weir plate 6 dams the workpiece supplied into the jacket 2, and the workpiece is 80% or more, preferably 95% or more of the length from the rotation center to the upper end of the stirring blades _4-1 to _4-45. And more preferably a member for holding it so as to be filled up to the height of the upper end (height exceeding the Y level in FIG. 2). If you are holding an object to be processed until stirring blade ₄ -1 _{to 4 -45} from the rotation center to the upper end of a length of at least 80% of the height, casting with preventing and drive mechanism for the stirring blade ₄ -1 _{to 4 -45} Occurrence of overloads 5a and 5b can be prevented. The dimensions and shape of the weir plate 6 are equivalent to the internal shape of the jacket 2 shown in FIG. 3, but in this embodiment, the height of the upper end is hidden by the workpiece to which at least the stirring blades _4-1 to _4-45 are put. The height is set to be higher than the upper height of the stirring blades _4-1 to _4-45 . The material used for the weir plate 6 may be a material that can withstand the extrusion pressure of the dried product by the stirring blades _4-1 to _4-45 , for example, an iron-based metal.

  The support member 7 is a structure for maintaining the jacket 2 at a predetermined height, and is constructed by combining a steel pipe, a shape steel, and the like having a desired strength.

[Operation and drying method of drying apparatus for processing object]
Next, operation | movement of the drying apparatus 1 mentioned above and the drying method are demonstrated. FIG. 7 is a flowchart showing an embodiment of a method for drying an object to be processed according to the present invention. The properties of the object to be treated in the present embodiment are, for example, sludge having a water content of 30 to 70% by mass, a copper grade of 5 to 50% by mass, a bulk specific gravity of 1.2 to 2.0, and a particle size of 1 to 100 μm. It is a shape. This is because the object to be treated having such properties cannot be sufficiently dried by a conventional conductive heat transfer type drying apparatus as shown in Patent Document 2, for example. Of course, the workpiece to be dried by the drying apparatus 1 in the present embodiment is not limited to such properties.

First, heating steam is introduced into the stirring blades _4-1 to _4-45 through the rotating shafts 3a and 3b, and the driving mechanisms 5a and 5b are driven to _{move the} stirring blades _4-1 to _4-45 at a predetermined speed. (For example, 15 to 30 rpm), the workpiece is introduced into the jacket 2 from the introduction port 2a (step S1: introduction step). The input speed of the object to be processed at this time is 1/3 or less of the rating (for example, 3.0 wt / h). When turning at a faster input rate than the rate of 1/3 of the rated, the treatment object is will be attached cast to stirring blade ₄ -1 _{to 4 -45,} no longer separated from the stirring blade ₄ -1 _{to 4 -45,} drying efficiency This is because it is remarkably lowered and a long-term operation stop is required after several days for removing the casting. Since the jacket 2 contains a large amount of moisture in the exhaust gas, the heated air is heat-exchanged with steam having a vapor pressure of 0.5 to 0.6 MPa in order to prevent dew condensation in the exhaust gas treatment facility and the exhaust duct 2d. Is introduced so that the inside of the jacket 2 does not fall below the dew point temperature. Also, a dust collector (not shown) connected from the exhaust duct 2d via a conduit (not shown) is provided with a steam trace, and at least the inside of the dust collector is maintained at 80 ° C. or higher. It prevents wet operation due to condensation and pressure loss soaring that it becomes impossible to operate.

The object to be processed put into the jacket 2 moves to the subsequent stage while being sequentially stirred by the rotating stirring blades _4-1 to _4-45 and the auxiliary blade 20, and a drying process is performed in the process. In this process, the height position of the workpiece to be dried is 80% or more of the length from the rotation center to the upper end of the stirring blades 4 _-1 to _4-45 , preferably 95% or more. Preferably, semi-drying is performed until the stirring blades _4-1 to _4-45 have a height at which the upper _ends are hidden (step S2: semi-drying step). In the semi-drying step, the object to be processed is dried so that the water content of the object to be processed is 20% by mass or more and less than 30% by mass. Perform semi-dry is to prevent the stirring blade 4 _-1 to 4 cast with prevention and drive mechanism 5a to _-45, the occurrence of 5b overload. In addition, the to-be-processed object which became a semi-dry state is called a semi-dry product. By continuing such a semi-drying process, a semi-dry product is accumulated in the jacket 2 and finally semi-drying is performed until reaching a level at which the upper _ends of the stirring blades _4-1 to _4-45 are hidden (step). S3: Accumulation step).

When the semi-dried product is stored in the jacket 2 to such a height that the stirring blades _4-1 to _4-45 are hidden, the charging speed of the workpiece is set to 80 to 100% of the rated charging speed (for example, 3.0 wt / h). The operation shifts to the rated operation at the charging speed (step S4: drying process). In the drying step, drying is performed so that the water content of the object to be processed is 15% by mass or more and less than 20% by mass. When complete drying is performed so that the moisture content of the object to be processed is less than 15%, if the particle size of the object to be processed is fine, severe dust generation will occur during the dry product storage or subsequent transportation, etc. This is because there is a risk of inconveniences such as deterioration of the equipment life and remarkably shortening of the equipment life. Therefore, the moisture content is temporarily held in the jacket 2 in a semi-dried product having a moisture content of 20% by mass or more and less than 30% by mass, and then the moisture content of the object to be processed is 15% by mass or more and less than 20% by mass by a drying process. Dry so as to be. Here, an object to be processed that has been dried is referred to as a dried product. If the particle size is not fine and there is no problem such as scattering after drying, drying may be performed until the water content is 15% by mass or less. Was dried and crushed by rotating the stirring blades 4 _-1 to 4 _-45 in the drying process drying product, overflows a weir plate 6 falls from the discharge port 2e to the discharge chute 2h is discharged to the outside of the jacket 2 (Step S5: Discharge process) Further, it is carried to a predetermined place by a sealed flow conveyor.

  As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment, and within the scope of the gist of the present invention described in the claims, Needless to say, various modifications and changes are possible. For example, the drying apparatus according to the present invention can be widely applied to objects to be processed other than copper-containing sludge. In addition, the dry product discharge facility and dust collector dust transport facility are designed to handle workpieces that are extremely susceptible to poor transport from the viewpoint of particle size, so they can handle a wider range of workpieces. is there.

DESCRIPTION OF SYMBOLS 1 Drying apparatus 2 Jacket 2a Input port 2b Heating air supply port 2c Drain discharge port 2d Exhaust duct 2e Discharge port 2f Heating steam supply port 2g Steam supply port 2h Discharge chute 3a, 3b Rotating shaft 4 _-1 to _4-45 Stirring blade 4a -4d Stirring blade 5 Drive mechanism 5a Motor 5b Deceleration device 5c Transmission member 6 Dam plate 7 Support member 8 Notch 9 Feed blade 10 Return blade 11 Bolt hole 12 Auxiliary blade mounting seat 20 Auxiliary blade 20a Auxiliary blade piece

Claims (11)

At least two rotating shafts arranged in parallel to each other are arranged so as to be rotatable in opposite directions to each other, and a plurality of stirring blades are arranged on the rotating shaft with a predetermined interval. Stirring-type drying in which the stirring blades attached and the stirring blades attached to the other side are alternately arranged, and the workpiece is heated and dried by supplying a heated heat medium to the jacket and the stirring blades In the method for drying the sludge-like workpiece by the apparatus,
A sludge-like object to be treated is introduced into the stirring type drying device at an input speed of 1/3 or less of the rated value, and the height position of the object to be treated in the stirring type drying device is rotated by the stirring blade. A semi-drying step of semi-drying until 80% or more of the length from the center to the upper end is hidden,
When the workpiece in the semi-dried state is stored in the stirring and drying apparatus to a height at which the stirring blade is hidden, drying is performed by feeding the workpiece at a rate of 80 to 100% of the rated speed. Process,
A method for drying an object to be processed, comprising: In the drying method of the to-be-processed object of Claim 1,
The method for drying an object to be processed is characterized in that the rated input speed of the object to be processed is 3.0 to 5.0 wt / h. In the drying method of the to-be-processed object of Claim 1 or 2,
The drying in the drying step is performed by rotating the stirring blade heated by introducing steam of 0.5 to 0.6 MPa into the interior at 15 to 30 rpm. . In the drying method of the to-be-processed object of any one of Claim 1 to 3,
The heated air is introduced into the agitation-type drying device and the exhaust gas exhausted from the agitation-type drying device is sent to the dust collection device at least before the dust collection device and / or the steam collection device. The method of drying an object to be treated is characterized in that the inside of the conduit and the inside of the dust collector are kept at a dew point temperature or lower by keeping the temperature at a low temperature. In the drying method of the to-be-processed object of any one of Claim 1 to 4,
A method for drying an object to be processed, wherein the object to be processed after drying is conveyed by a closed conveyor. In the drying method of the to-be-processed object of any one of Claim 1 to 5,
The said processed material is 30-70 mass% of water contents, 5-50 mass% of copper grades, and bulk specific gravity 1.2-2.0, The drying method of the processed material characterized by the above-mentioned. In the drying method of the to-be-processed object of any one of Claim 1 to 6,
In the said semi-drying process of the said to-be-processed object, the semi-drying is performed so that the moisture content of the said to-be-processed object may be 20 mass% or more and less than 30 mass%, The drying method of the to-be-processed object characterized by the above-mentioned. In the drying method of the to-be-processed object of any one of Claim 1 to 7,
When the particle size of the object to be treated is 1 to 100 μm, the drying step is performed such that the moisture content of the object to be treated is 15% by mass or more and less than 20% by mass. A method for drying an object to be processed. At least two rotating shafts arranged in parallel to each other are arranged so as to be rotatable in opposite directions to each other, and a plurality of stirring blades are arranged on the rotating shaft with a predetermined interval. Stirring-type drying in which the stirring blades attached and the stirring blades attached to the other side are alternately arranged, and the workpiece is heated and dried by supplying a heated heat medium to the jacket and the stirring blades In the device
The upper end of the weir plate arranged on the jacket is formed to be 80% or more of the length from the rotation center to the upper end of the stirring blade, and the processed material after drying is removed from the weir plate. A stirrer type drying apparatus characterized in that it can be discharged by overflowing. The stirring-type drying apparatus according to claim 9,
Heating air supply means for introducing heated air into the stirring device;
A conduit for sending exhaust gas exhausted from the stirring device to a dust collector;
A steam trace provided at least before the dust collector and / or in the dust collector so that the temperature inside the dust collector does not become a dew point temperature or less;
An apparatus for drying an object to be processed, comprising: In the drying apparatus of the to-be-processed object of Claim 9 or 10,
An apparatus for drying an object to be processed, wherein a conveying means for conveying the object to be processed after drying is hermetically sealed.

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