WO2019103419A1 - Device for mixing blended raw materials for sintered ore - Google Patents

Abstract

The purpose of an embodiment of the present invention is to provide a device for mixing blended raw materials for sintered ore, wherein the performance of the mixer is improved such that the performance of granulating sintered blended raw materials can be improved. A device for mixing blended raw materials for sintered ore according to an embodiment of the present invention comprises: a primarily mixer for receiving blended raw materials from a blended raw material storage portion and mixing the charged blended raw materials, thereby forming primarily granulated fuel; and a secondary mixer for receiving the primarily granulated fuel formed by the primary mixer and forming secondarily granulated fuel. The primary mixer comprises: multiple lifters provided therein near the entrance of blended raw materials and installed to slope at a sloping angle of 20-45º in the reverse direction with regard to the direction of movement of the blended raw materials such that the blended raw materials are lifted to a predetermined height, thereby increasing the time for which the blended raw materials stay; a spraying portion provided between the lifters and the exit of the blended raw materials along the longitudinal direction of the primary mixer so as to supply moisture to the blended raw materials mixed by driving of the lifters; and at least one first blade provided along the inner peripheral surface so as to have a predetermined first protruding height, thereby mixing and granulating the charged blended raw materials.

Description

Mixing raw material mixing device for sintered ores

The present invention relates to a blending raw material mixing apparatus for sintered ores.

The raw materials to be used in the blast furnace may include raw materials such as sintered oresite, pellets and pellets, coke for securing the air permeability in the blast furnace, and reducing iron ores. Sintered ore is not only the most used raw material but also the cheapest raw material. Therefore, various efforts to increase the use ratio of the sintered ores have been continuously carried out. For this reason, the sintering equipment for the production of iron ore sintering has gradually increased the effective image area, increasing the effective image area from 150 ~ 200㎡ to 450 ~ 600㎡. As a result, the height of the sintered bogie has been increased to 700 ~ 1,000mm at the previous 500mm level. Using these large sintering machines, a large amount of iron ore sintered ores are produced and supplied to the blast furnace by using binders such as iron ore, limestone, quick lime, quartz and serpentine, semitransparent materials, and binders such as coke and anthracite.

On the other hand, when the sintering blend material is improved in the granulation property when it is used in the manufacture of the sintering blast furnace, it is necessary to continuously improve the assembling performance of the pelletizing machine because the sintering productivity can be improved, have. However, in order to improve the assemblability of the raw materials for sintering, there is a continuous demand for improving the performance of the mixer or the performance of the mixer.

An embodiment of the present invention is to provide a blending raw material mixing apparatus for a sintered ore which can improve the performance of the blending machine to improve the assembling performance of the sintering blending raw material.

The mixing raw material mixing apparatus for sintered ores according to an embodiment of the present invention includes a primary mixer for mixing a raw material mixture supplied from a mixing material storage unit and mixing the charged raw materials to form a primary assembly fuel, And a secondary mixer for receiving the assembled fuel to form a secondary assembly fuel, wherein the primary mixer is provided at a plurality of inlet sides of the mixing material in the interior thereof, and the inclination angle of the mixing material ranges from 20 degrees to 45 degrees A lifter for lifting the mixing raw material to a predetermined height to increase the residence time of the raw material for mixing and a lifting device for lifting the mixing raw material, A jetting section for supplying water to the raw material, and a first projection height preset along the inner circumferential surface of the jetting section, It includes at least one first blade assembly.

The lifter includes a lifting plate having a predetermined inclination angle in a reverse direction that feeds the raw material mixture to the inlet side on the basis of the longitudinal horizontal surface of the first mixer, and a lifting plate having one side fixedly coupled to the inner peripheral surface and the other side coupled to the lifting plate, And may include a pedestal supporting it. Here, the backward inclination angle of the lifting plate can be set to 20 degrees to 45 degrees. And the height of the lifter may be formed higher than the first projecting height of the first blade.

The secondary mixer includes at least one second blade having a predetermined second protrusion height along the inner circumferential surface to mix and mix the charged blend materials, and a second blade having a height higher than the second protrusion height along an inner circumferential surface in the longitudinal direction 3 protruding height to increase the moving distance of the blended raw material. Here, the reverse blade may be formed in a spiral shape having a screw thread of one pitch to three pitches for guiding the transfer of the raw material charged in the interior of the secondary mixer to the inlet side during rotation of the secondary mixer.

The first section A of the inlet side, the second section B of the middle section, and the third section C of the outlet side along the longitudinal direction of the primary mixer, Within range. The liner may further comprise a urethane liner coupled to the interior of the primary mixer or secondary mixer to prevent adhesion of the build-up light within the primary mixer or secondary mixer.

In order to improve mixing and granulation of blending materials for sintering, blending equipment such as lifter, liner, and reverse blades are provided and the position of spraying water is adjusted to improve sintering productivity and blending effect of blending materials to improve sintering quality There is an effect.

1 is a view schematically showing a sintering production apparatus including a blending raw material mixing apparatus for sintering according to an embodiment of the present invention.

2 is a schematic view of a primary mixer according to an embodiment of the present invention.

3 is a schematic view of a secondary mixer according to an embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 is a view schematically showing a sintering production apparatus including a blending raw material mixing apparatus for sintering according to an embodiment of the present invention. The production flow of the iron ore sintered ore will be described with reference to FIG. Raw materials such as iron ore, raw materials such as limestone, and fuel such as coke are stored in respective hoppers, and then discharged to a predetermined ratio so as to meet the proper mixing ratio, and then charged into a drum mixer as a primary mixer (120). do. At this time, the reflection of -5 mm or less during the semi-light is stored in the semi-light hopper and then charged into the primary mixer 120 such as iron ore, additives, fuels, and raw materials, (130) to complete the assembly, and then charged into the surge hopper (1).

On the other hand, the upper light is used for the purpose that the sintered light in the melt state is not adhered to the lower part of the sintering vehicle. The sintered light having a particle size of about 10 to 15 mm after passing through the screen of the sintered light secondary screen is charged into the upper light hopper 3 do. After the upper light is charged into the lower part of the truck through the upper light hopper 3, the blended raw materials assembled from the surge hopper 1 are fed through the drum feeder 4 and segregated according to the difference in particle size and density through the swash plate 5 (2). After the sintering is completed, the surface layer of the charge material is flattened in the cut off plate 5-1 before being transferred to the ignition furnace 6, and then transferred to the ignition furnace 6. The upper part of the sintered bed is ignited in the ignition furnace 6, and the upper air is sucked down through the main blow 7 to proceed the sintering. At this time, as the sintering progresses, the exhaust gases that have been reacted in the sintered bed pass through the main vent pipe 9 through the wind box 8, collect dust and the like from the electrostatic precipitator 10 And exits to the stack (11). This series of processes is continuously carried out to produce sintered ores used in the blast furnace.

The blending material mixing apparatus for sintering according to an embodiment of the present invention includes a primary mixer 120 and a secondary mixer 130 in the above-described sintering production apparatus. The performance of the primary mixer 120 and the secondary mixer 130 is improved to improve the sintering productivity and mixing effect of the raw materials to improve the mixing and granulation of the raw materials for sintering, have. In the case of the primary mixer 120, the slurry has a slope of about 2 to 3 degrees relative to the horizontal plane to facilitate the movement of the ingredients, and the secondary mixer 130 has a slope of about 2 to 3 degrees. The primary mixer 120 and the secondary mixer 130 are rotating at about 5 rpm to 10 rpm. (Usually 0.5 mm or more) around nuclear particles (typically 1 mm or more particles) as moisture as the compounding materials are moved along the proceeding direction according to the rotation operation of the primary mixer 120 and the secondary mixer 130. [ (Pseudoparticles) are adhered to form the granules (pseudoparticles). The primary mixer 120 functions to mix and assemble the raw materials including iron ores, additives and binders such as coke or anthracite, and semitransparency. If sufficient mixing is not performed at this time, components such as calcium oxide (CaO) or carbon (C) in the raw material mixture are unevenly distributed. As a result, uneven sintering due to the difference in sintering reactivity proceeds, which may result in degradation of sintering quality. In the case of the primary mixer 120, not only the mixing of the ingredients but also the assembly function is performed. At this time, it is important to improve the assemblability by increasing the time required for assembly in the limited primary mixer 120 specification.

2 is a schematic view of a primary mixer according to an embodiment of the present invention. 2, the primary mixer 120 includes a lifter 126, a jetting unit 124, and a first blade 122 inside a cylindrical body 120a. And the supplied blended raw materials are mixed to form a primary assembly fuel.

The lifter 126 is provided at a plurality of inlet sides of the raw materials for mixing and is inclined at an inclination angle of 20 degrees to 45 degrees in a reverse direction with respect to the direction of progress of the raw materials to be mixed. Thereby increasing the residence time. The lifter 126 may include a lifting plate 126a and a pedestal 126b. The lifting plate 126a may have a length of 200 to 250 mm and a thickness of 10 to 30 t. The lifting plate 126a may be provided with a predetermined inclination angle in a reverse direction that feeds the raw material mixture to the inlet side on the basis of the longitudinal horizontal surface of the first mixer. The reverse inclination angle of the lifting plate 126a can be set to 20 degrees to 45 degrees. The pedestal 126b may have one side fixedly coupled to the inner circumferential surface and the other side coupled to the lifting plate 126a to support the lifting plate 126a. The height of the lifter 126 may be higher than the first projecting height of the first blade 122. The height of the lifter 126 can be set to 250 to 350 mm.

The jetting section 124 is provided along the longitudinal direction of the primary mixer 120 between the lifter 126 and the outlet side of the raw material mixture and supplies moisture to the raw material mixture mixed by driving the lifter 126. The sprayer 124 may include a spray nozzle installed in the longitudinal direction inside the primary mixer 120 to spray water to the mixed raw material. The injection nozzle is provided so as to be directed to a portion where the compounding material is filled in a predetermined region. Water is supplied to a large amount of the compounding material at the time of water injection, thereby efficiently supplying moisture to the compounding material, Can be improved.

The first blades 122 are provided with at least one predetermined height along the inner circumferential surface and at least one of mixing and mixing the charged blend materials. The first protrusion height of the first blade 122 can be set to 100 to 200 mm. When the primary mixer 120 rotates, the plurality of first blades 122 feed the blended raw material supplied therein by a predetermined amount. The blended raw material transferred to the upper part can be mixed while dropping again by gravity.

On the other hand, the first section A of the inlet side, the second section B of the middle section, and the third section C of the outlet side can be distinguished along the longitudinal direction of the primary mixer 120. The lifter 126 may be provided in the first zone A which is the inlet side of the raw material mixture. And the jetting section 124 may be provided within the range of the second zone (B) to the third zone (C). The liner 128 may further include a urethane liner 128 coupled to the interior of the primary mixer 120 or the secondary mixer 130 to prevent attachment of adhered light within the primary mixer 120 or the secondary mixer 130 can do. Adhesion light may adhere to the inside of the primary mixer 120 or the secondary mixer in the assembly of the ingredients using water. If the adhesive light adheres to the inside of the primary mixer 120 or the secondary mixer, the working volume inside the mixer may be reduced, which may lead to deterioration of the assemblability. As a solution to this problem, various types of liner are tested to prevent sticking of adhesive light, and a liner 128 made of urethane material is selected and installed in the mixer, thereby improving the workability of the mixer, have.

As described above, the internal structure of the primary mixer 120 can be improved to improve the mixing and assembling property in the production of sintered ores. For example, only the blades are provided inside the primary mixer 120 used for assembling the conventional blended materials, and the position where the water is sprayed is also installed at the inlet side of the primary mixer 120. In the embodiment of the present invention, a lifter 126 is provided at the inlet side of the primary mixer 120 to maximize the mixing ability of the raw material mixture. The position of the jetting section 124 is also moved from the inlet side of the primary mixer 120 to the position after the lifter 126, so that the water can be injected in a state in which the lifter 126 is sufficiently mixed. As described above, the blending and granulation property of the blending raw materials used for producing the sintered ores can be improved to improve the productivity of the sintering due to the improvement of the granulation property and the uniform firing effect by the improvement of the blending property.

3 is a schematic view of a secondary mixer according to an embodiment of the present invention. 3, the secondary mixer 130 according to the embodiment of the present invention includes a second blade 132 and a reverse blade 134 inside a cylindrical body 130a, and the primary mixer 120, And the secondary assembly fuel is formed.

The second blades 132 are provided with a predetermined second protrusion height along the inner circumferential surface to mix and mix the charged blend materials, and at least one or more blades are provided. Here, the second protrusion height of the second blade 132 can be set to 100 to 200 mm.

The reverse blade 134 has a predetermined third protrusion height along the inner circumferential surface in the longitudinal direction to increase the movement distance of the material mixture. The reverse blade 134 may be formed in a spiral shape having a screw thread of one pitch to three pitches for guiding the conveyance of the raw materials charged in the inside of the secondary mixer 130 to the inlet side. Here, the third projection height may be formed to be higher than the second projection height. For example, the third protrusion height of the backward blade 134 can be set to 200 to 300 mm. As described above, since the reverse blade 134 is installed in the secondary mixer 130, it is possible to increase the moving distance of the raw material mixture and improve the assembling performance due to the increase of the residence time.

As described above, the embodiment of the present invention relates to a blending raw material mixing apparatus for sintered ores for improving sintering productivity and sintering quality by improving blendability of blended raw materials. The mixing ability of the raw materials can be increased by changing the internal structure of the primary mixer 120 and the secondary mixer 130, And it is possible to remarkably improve the assemblability and the assemblability of the assembly. In addition, the sintering productivity can be improved by shortening the sintering time by improving the air permeability inside the sintered bed by improving the granulation property of the sintering blend material. In addition, it is possible to improve the mixing ability of the blending raw materials used in the production of the sintered ores and to uniformly disperse the flux and coke in the sintering blending raw materials in the sintering blending raw materials to improve the uniform firing ability during the sintering. That is, by improving the structure of the primary mixer 120 and the secondary mixer 130, the pesticide material pellets having excellent mixing and granulating ability are produced and utilized in the production of sintered ores, thereby improving the overall sintering quality, It is possible to improve the sintering productivity by supplying the blended raw material with improved assembling property during the production of the sintered ores. In addition to the primary mixer 120 and the secondary mixer 130, it is possible to improve the internal shape of the primary mixer 120 and the secondary mixer 130 without the addition of a tertiary mixer, It is possible to improve the assemblability of the sintering raw material without increasing the site and increasing the capital investment cost.

Detailed experimental results for improving the assemblability of the sintering raw material by improving the structure of the primary mixer 120 and the secondary mixer 130 will be described in the following experimental examples.

(Experimental Example 1)

In the experimental example 1 of the present invention, the lifter 126 was provided at the inlet side of the primary mixer 120 as shown in Fig. The lifter 126 is formed to have a height of 250 to 350 mm from the main body in the primary mixer 120, compared to the height of the first blade 122 of 100 to 200 mm. The lifter 126 may be installed at 1/4 to 1/3 of the entire length of the primary mixer 120. The lifter 126 may include a lifting plate 126a having a width of 200 to 250 mm and a rectangular shape having a thickness of 10 to 30 t and a pedestal 126b capable of supporting the lifting plate 126a. The pedestal 126b is fixed inside the main body 120a of the primary mixer 120. [ The function of the lifter 126 is to maximize the mixing efficiency by lifting the ingredients from the low point to the highest point within the primary mixer 120 and to adjust the retention time of the ingredients in the primary mixer 120, The assembly time can be improved by increasing the assembly time. Therefore, the angle of the lifter 126 as well as the installation of the lifter 126 is also important.

Therefore, in the case of the lifter 126, the horizontal surface is set to 0 degree and the lifter (the direction in which the blending material is fed to the outlet of the primary mixer 120) and the reverse direction (the blending material is fed to the inlet of the primary mixer 120) 126 were experimentally performed while varying the angles of the granules and the granules. The results are shown in Tables 1 and 2. The symbol "+" is used for the forward direction and the symbol "-" for the reverse direction.

	0	+15	+30	+45	-15	-30	-45
CaO component deviation (%)	0.59	0.65	0.80	0.74	0.62	0.44	0.53

The standard deviation of measured values obtained by measuring the calcium oxide (CaO) component value in the raw material mixture 7 times for each angle was obtained by changing the angle of the lifter 126 under the conditions of the angle and the rotation speed of the same primary mixer 120 , And the values are shown in Table 1. Referring to Table 1, when the reverse 30-degree lifter 126 is installed, the calcium oxide (CaO) component variation in the raw material mixture is the smallest, which means that the mixing effect is increased as a result.

	0	+15	+30	+45	-15	-30	-45
Average size of granules (mm)	4.61	4.46	4.25	4.30	4.90	4.95	4.83

Table 2 shows the average particle size of the granulated material according to the angular variation of the lifter 126. It was found that the average grain size of the granulated product varied depending on the angle of the lifter 126. Particularly, when the lifter 126 was installed at 30 degrees in the reverse direction, the average granularity of the granulated product was the largest,

	0	+15	+30	+45	-15	-30	-45
Mixture residence time (min)	3.49	3.29	2.95	3.04	4.44	4.53	4.25

Referring to Table 3, it can be clearly seen from the fluctuation of the residence time in the primary mixer 120 due to the angular variation of the lifter 126. The increase in the residence time in the primary mixer 120 is equivalent to the increase in the travel distance for assembling the ingredients in the primary mixer 120. The increase in residence time directly affects the increase in the average particle size of the granule. As can be seen from Table 3, when the angles of the lifters 126 are arranged in the positive direction, the residence time in the mixer tends to be short without sufficient mixing, while when the angles of the lifters 126 are arranged in the reverse direction, 120), as shown in Table 2, the average particle size of the granules tends to increase. Especially, it was found that the longest retention time in the first mixer (120) I could.

(Experimental Example 2)

In Experimental Example 2 of the present invention, not only the installation of the lifter 126 but also the water spraying position effective for improving the assemblability were shown. In order to select these optimal water spray positions, the interior of the primary mixer 120 was divided into three Experiments were conducted on the average particle size fluctuation of the granules when spraying water at each position, and the results shown in Table 4 were obtained. At this time, along the longitudinal direction of the primary mixer 120, the inlet side 1/3 point of the entirety of the triple is referred to as a first zone A, the mid-point 1/3 point is divided into a second zone B and an outlet side 1/3 And the third branch (C). In addition, the experiment was carried out in accordance with the variation of the water injection position while keeping the total water content equal. The average particle size of the granules according to the variation of the water spray position was examined based on the installation of the reverse 30-degree lifter 126.

	A	B	C	A + B	B + C	A + B + C
Average size of granules (mm)	4.56	4.95	4.90	4.76	4.97	4.89

As shown in Table 4, when the water spray is performed from the inlet side of the primary mixer 120, the average particle size of the granules is small. Particularly, it was found that the water granulation in the first zone (A) on the inlet side is the least granular. This can be explained as follows. That is, quicklime is used as a binder when the compounding raw material is assembled. When the quicklime is uniformly distributed in the compounding raw material, the granulation improving effect is exhibited. In the case where the water spraying position is the first zone (A), since the water is added immediately before the sufficient mixing effect of the blending raw material appears, the effect of improving the assemblability due to the dispersion of quicklime is relatively small. In Experimental Example 2 of the present invention, water sprinkling at a point after the first zone A on the inlet side after the sufficient mixing effect of the raw material mixture is expressed by the lifter 126, the second zone B and the second zone B) + water spraying in the third zone (C) is relatively excellent in assembling effect. On the other hand, when water is sprayed only in the third zone (C), the mixing effect is sufficient. However, the assembly effect is less than the second zone (B) because the time until the water is sprayed and assembled is relatively short. [Experimental Example 3]

In Experimental Example 3 of the present invention, various types of liners were mounted in the primary mixer 120 for the purpose of improving the workload inside the primary mixer 120 through suppressing adherence in the primary mixer 120, (120) were attached to each other. At this time, in the case of the attachment adherence measurement, the degree of attachment of the primary mixer 120 to the primary mixer 120 according to the variation of the liner type was evaluated with a primary mixer for testing in which the actual primary mixer 120 was reduced to 1/7. At this time, the amount of the sample used was 70 kg, and the moisture content was maintained at about 8%. Table 5 shows the result of measurement of the amount of adhesion in the primary mixer 120 according to the variation of the liner type.

	Steel	Rubber	urethane
Adhesion inside the mixer (g)	320	150	100

Referring to Table 5, it was found that the urethane type liner 128 is effective in suppressing the adherence inside the primary mixer 120. On the other hand, the raw materials for sintering are firstly mixed and assembled in the primary mixer 120, and then finally assembled in the secondary mixer 130. The improvement in the assemblability in the secondary mixer 130 results in an effect of improving the final assemblability of the sintering raw material.

(Experimental Example 4)

In the experimental example 4 of the present invention, in addition to the primary mixer 120, the secondary mixer 130 is provided with a spiral reverse blade 134 in addition to the second blade 132, thereby improving the assembling performance. Here, the reverse direction refers to the counterclockwise direction when the rotation direction of the secondary mixer 130 is clockwise. Table 6 shows the average particle size fluctuation of the granulated product according to the installation of the reverse blade 134.

	No reverse blade	Reverse blade 1 pitch		Reverse blade 2 pitch	Reverse blade 3 pitch		Reverse blade 4 pitch		Reverse blade 5 pitch
Average size of granules (mm)	4.49	4.85	4.88	4.86	4.72	4.61

Referring to Table 6, it can be seen that the average grain size of the granules is increased when the reverse blade 134 is installed, as compared with the case where the reverse blade 134 is not installed. The principle and installation method of the reverse blade 134 are as follows. In the case of the blended raw material, the blended raw material is fed into the secondary mixer 130 and then discharged along the rotating direction of the secondary mixer 130 to the outside of the secondary mixer 130 through the assembling process. The mixing materials can be prevented from being discharged to the outside of the secondary mixer 130 during the installation of the reverse blades 134, thereby improving the assembling performance by increasing the residence time in the secondary mixer 130. In addition, in the case where only the second blades 132 are provided, the assembling property is improved according to the effect of increasing the moving distance required for assembling the blend materials. In the same secondary mixer 130, 134 may be installed in the secondary mixer 130 so as to have thread pitches of one pitch to three pitches. As shown in Table 6, when the threads exceed 3 pitches, the average particle size of the granules is rather reduced. This is due to the excessive separation of some of the granules as a result of the excessive movement of the ingredients. Therefore, it is desirable that the secondary blade 130 is designed to have a spiral structure within three pitches when the reverse blade 134 is installed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. And it goes without saying that they belong to the scope of the present invention.

(Explanation of Symbols)

120; Primary mixer 122; The first blade

124; A jetting section 126; Lifter

126a; Lifting plate 126b; Pedestal

128; Liner 130; Secondary mixer

132; A second blade 134; Reverse blade

Claims (7)

1. A primary mixer for supplying a raw material mixture from the raw material storage portion and mixing the charged raw materials to form a primary assembly fuel, and

   A secondary mixer for supplying the primary assembly fuel formed in the primary mixer and forming a secondary assembly fuel,

   / RTI >

   The primary mixer

   And a lifter for raising the mixing raw material to a preset height to increase the residence time of the raw material mixture, wherein a plurality of the plurality of raw material mixing materials are provided at an inlet side of the mixing raw material and are inclined at an inclination angle of 20 to 45 degrees in a direction opposite to the advancing direction of the mixing raw material, ,

   A spraying portion provided along the longitudinal direction of the primary mixer between the lifter and the outlet side of the mixing material and supplying moisture to the mixing material mixed by driving the lifter;

   At least one first blade having a first protruding height preset along the inner circumferential surface to mix and mix the charged blend materials,

   Wherein the blending raw material blending raw material blending raw material blending raw blending blending raw material blending blending raw blending raw blending blending raw blending raw blending raw blending blending raw blending raw blending raw blending raw blending raw blending blending raw blending raw blending raw blending raw blending raw blending
2. The method of claim 1,

   The lifter

   A lifting plate having an inclination angle of 20 to 45 degrees in a direction opposite to the feeding direction of the raw material mixture on the basis of the longitudinal horizontal surface of the first mixer,

   And one end of which is fixedly coupled to the inner circumferential surface and the other end of which is coupled to the lifting plate to support the lifting plate

   Wherein the blending raw material blending raw material blending raw material blending raw blending blending raw material blending blending raw blending raw blending blending raw blending raw blending raw blending blending raw blending raw blending raw blending raw blending raw blending blending raw blending raw blending raw blending raw blending raw blending
3. 3. The method of claim 2,

   Wherein a height of the lifter is higher than a height of a first projection of the first blade.
4. The method of claim 1,

   The secondary mixer

   At least one second blade provided with a predetermined second projection height along the inner circumferential surface to mix and assemble the charged blend materials, and

   And a third projecting height formed to be higher than the second projecting height along an inner circumferential surface in the longitudinal direction to increase the travel distance of the blended raw material.
5. 5. The method of claim 4,

   Wherein the reverse blade is formed in a spiral shape having a screw thread of one pitch to three pitches for guiding the feed of the raw materials charged in the inside of the secondary mixer to the inlet side during rotation of the secondary mixer.
6. The method of claim 1,

   The first section A of the inlet side, the second section B of the middle section and the third section C of the outlet side along the longitudinal direction of the primary mixer, And a third zone.
7. The method of claim 6,

   Further comprising a urethane liner coupled to the primary mixer or the secondary mixer to prevent adhesion of adhering light in the primary mixer or the secondary mixer.

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