Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
  • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
  • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
  • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
  • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
  • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general

Definitions

• the present invention relates to a manufacturing method for alphabet used as an iron-making raw material and an opi manufacturing facility.
• the coatus used as a raw material for iron making has a high strength because it deteriorates the air permeability of the blast furnace when it is pulverized when charged into the blast furnace.
• the smaller the particle size of the coal, the raw material is preferable.
• the smaller particle size of the coal is difficult to handle when charging in the coke oven. Therefore, it is preferable to use coal with a particle size in the range of about 0.5 mm to 6 mm, for example, because productivity does not improve.
• the pulverized coal is changed to a coal having a particle size of only 0.5 mm to 6 mm except for those less than 0.5 mm and exceeding 6 mm by sieving.
• the one below 0.5 mm will be disposed of without any preferred use, resulting in processing costs.
• the coal is classified with a sieve having a sieve with a predetermined particle size, and the portion under the sieve is mixed as it is for cotas.
• a method is known in which the coarse particles on the sieve are used as a raw material, and the pulverization and classification are repeated until the coarse particles pass through the sieve (see, for example, Japanese Patent Laid-Open No. Sho 5 6-3 2 587).
• the sieve mesh is changed between coal rich in active components (soft coal) and coal rich in active components (hard coal). Therefore, the particle size of coal that is not rich in active ingredients is made smaller to make a blended raw material.
• Coal whose particle size is adjusted to each is mixed as appropriate and charged into a coke oven to produce a high strength cortas.
• the method described in Japanese Patent Application Laid-Open No. 1 1 1 3 0 2 6 6 2 has a maximum number of crushing times of 2 for the same coal. Since it is crushed again by the crusher, even if a distribution close to the ideal coal particle size distribution state is obtained, where the fine particles increase and the filling state in the coatus furnace is the closest packing, it is not desirable in actual operation . In addition, since the crushed coal is classified into three stages of large particle size, medium particle size, and small particle size, the equipment cost for sieving increases.
• the object of the present invention is to solve the problems of the prior art, and to improve the coatus strength by reducing the productivity and suppressing the cost increase while keeping the particle size distribution of the coke raw material coal within an appropriate range. It is to provide a method and equipment for producing coke that can be used. Disclosure of the invention
• the first pulverization step, the first pulverization step of mixing the coal pulverized in the first pulverization step and the coal having a small particle diameter, and the second pulverization step of pulverizing the mixed coal And then charging the coke oven together with the remainder of the coal used as the raw material for the coatus.
• the coal treated with the second powdered step is charged into the coke oven.
• a method for producing a coatus comprising: (4) A method for producing coatas using coal (X) having a high hardness and coal (Y) having a hardness lower than that of the coal (X), wherein at least a part of the coal (X) is granulated.
• a method for producing a coatus comprising charging (X) and the coal (Y) into a coke oven.
• the first coal blending step is performed by a first blending step of blending the small coal and the remainder of the coal (X), and a second powdering step of pulverizing the blended coal, and blending the coal (Y)
• the coal (X) and the coal (Y) are charged into a coke oven after being treated by the second blending step and the third grinding step of grinding the blended coal. Coke production method.
• a method for producing one tas wherein a classification step of classifying at least a part of the coal (X ′) into a coal having a larger particle diameter and a coal having a smaller particle diameter than the coal; A first pulverizing step of pulverizing coal, and a first compounding step of combining the coal treated in the first pulverizing step with the coal having a small particle diameter and / or the remainder of the coal (X ′). And a second crushing step of crushing the blended coal, and thereafter charging the coal (X ′), the coal ( ⁇ ′), and a coke oven.
• a classification step of classifying at least a part of (X ′) into a coal with a large particle size and a coal with a small particle size, a first pulverization step for pulverizing the coal with a large particle size, and the first pulverization A first blending step of blending the coal treated in the step with the coal having a small particle size, and a second grinding step of grinding the blended coal, and the remainder of the coal (X ′) And the second coal blending step in which the coal ( ⁇ ′) is blended separately, and a third powder milling step in which the blended coal is separately ground,
• a method for producing a coat characterized by charging ( ⁇ ,) and the coal ( ⁇ ,) into a coke oven.
• a classifier that classifies a part of coal as a raw material for coatas into a coal with a large particle size and a coal with a small particle size, a first pulverizer that pulverizes the coal with a large particle size, A blending tank for blending the coal treated with the first powder mill, the coal having a small particle size, and the remainder of the coal as the coke raw material, and a grinder for grinding the coal blended in the blending tank; Processed by the crusher Cotas production facility comprising a transporter for transporting coal to a coke oven.
• a classifier that classifies a part of coal that is a raw material for the coatus into a coal with a large particle size and a coal with a small particle size, a first powder mill that crushes the coal with a large particle size, A first compounding tank for compounding the coal treated with the first powder mill and the coal having a small particle diameter; and a second pulverizer for pulverizing the coal compounded in the first compounding tank And a second blending tank for blending the remainder of the coal as the coke raw material, a third mill for grinding the coal blended in the second blending tank, and the second mill
• a coatus production facility comprising a transporter for transporting coal and the coal treated by the third grinder to a coatus furnace.
• FIG. 1 is a schematic diagram of an embodiment of the coatus production facility of the present invention.
• Figure 2 Graph showing the particle size distribution of blended coal.
• Fig. 3 Graph showing the relationship between the classified particle size and the coatus production cost in the classification process.
• At least a part of the coal used as the raw material for coatus is It is divided into coal with a large particle size and coal with a small particle size, and after pulverizing the coal with a large particle size, the coal with the small particle size is mixed and re-pulverized and charged into a coke oven.
• a classification step of classifying at least a part of coal as a raw material for raw materials into a coal having a large particle size and a coal having a smaller particle size than the coal and a step of pulverizing the coal having a large particle size.
• the first pulverization step the first pulverization step of mixing the coal pulverized in the first pulverization step and the coal having a small particle diameter
• the second pulverization step of pulverizing the mixed coal. After that, it is charged into a coke oven together with the remainder of the coal used as the raw material for the coatus. It is sufficient to classify coal with a large particle size and coal with a small particle size by sieving using a sieve. Therefore, as the classification process, for example, using a sieve, the top and bottom sieves are used. Classify coal into In the first pulverization process, powder is reduced on the sieve having a particle size larger than the sieve mesh to reduce the particle size.
• the first pulverization step is not performed, and the first pulverization step is combined with the first pulverization step (the first mixing step), followed by the second pulverization step. Crushing process.
• the first blending step it is sufficient to put coal with a large particle size and coal with a small particle size into a blending tank or the like to make a mixed state.
• Special mixing means are also used in the following blending steps. There is no need to provide it. By crushing only the coal with a large particle size in advance (first crushing process), the proportion of coal with a large particle size decreases.
• the ratio of coarse particles is reduced, so that the pulverization ability in the second pulverization step can be reduced and pulverization can be performed.
• the coal particle size distribution is improved. After pulverizing coal on a sieve with a large particle size in the first pulverization process, the same coal is repeatedly pulverized by pulverizing in the second pulverization process together with sieving without repeating classification by sieving again. This is advantageous in terms of productivity.
• the “first grinding process” and the “second grinding process” This can be dealt with by using a different crushing device, or by reducing the number of revolutions of the crushing blade of the crushing device so that the “second powdering process” has a lower powdering capacity than the “first powdering process”.
• a second pulverizing step of pulverizing the blended coal, and the remainder of the coal as the coatus raw material is blended with the remainder of the coal as the coke raw material, and the blended coal It is desirable that the powder be pulverized in the third pulverization step and charged into the coke oven together with the coal pulverized in the second pulverization step.
• the third powdering process should be omitted if it is fine-grained or has a suitable particle size distribution for charging into the coke oven. Is also possible.
• coal (Y) can also be blended in the first blending step and pulverized in the second pulverization step. That is, coal with high hardness
• the quality of coal such as hardness and inert amount, varies depending on the brand, and it is desirable to adjust the grinding conditions for each brand and form a powder frame. Therefore, it is preferable that a plurality of coal tanks are arranged according to coal quality or brand, and a plurality of crushers are arranged correspondingly.
• the second compounding step of compounding the coal (i) and the compounding method.
• coal (X) with a high hardness and coal with a hardness lower than that of the coal (X) (Y) and a method for producing coke wherein at least a part of the coal (X) is classified into coal having a large particle size and coal having a small particle size, and the particle size
• the coal (X) and the coal ( ⁇ ) are charged into a coke oven. It can also be selected as a desirable method.
• Coal which is usually a coke raw material consisting of multiple brands, is replaced with high hardness coal
• coal (X) and coal (X) with lower hardness than the coal (X) a predetermined standard set as appropriate is used, and coal (X) with a hardness higher than the predetermined standard is selected. It can be classified as coal ( ⁇ ), which has a lower hardness than the standard. For example, when producing Cotas using coal brands A, B, and C, classify coal brand A, which has the highest average hardness, into coal (X), which has the highest hardness, and coal brands B, C, which have low hardness. Classify as coal (Y). In addition, when using coal brands D, E, and F, which have lower hardness compared to coal brands A, B, and C, set a predetermined standard low and compare with coal brands D, E, and F.
• Coal brand D with high hardness can be classified as coal (X) with high hardness. Desirable standards should be set so that the cost of Kotas production and the production efficiency are optimized in consideration of the brand of raw coal used and the production capacity of Kotas. As is clear from the above example, high hardness coal (X) and low hardness coal (Y) are not limited to a single brand, but consist of multiple brands of coal. It has.
• hard coal is preferentially treated in the first grinding process. This is because coal with a large particle size is mainly high-hardness coal, and productivity can be improved by preferentially increasing the number of powdered hard coal that is difficult to grind.
• the coal is classified into a coal having a large particle size and a coal having a small particle size, Even if the amount of stone that is pulverized into coal with a large particle size is about 10% of the total amount of coal, the coal (X) in the entire raw material is preferentially classified and crushed. As a result, the particle size distribution can be remarkably improved.
• the classification of coal (X) and other types of coal is not strict, and an average hardness is defined for each brand of coal, and if the average hardness exceeds a predetermined standard, it will be classified as coal (X).
• the coal (X) may partially contain coal having a hardness below a predetermined standard. The larger the proportion of coal (X) that is processed in the classification process and the first powdering process, the better the particle size distribution, but the processing cost also increases.
• HGI hard glove index: JIS—M — 8 8 0 1
• HGI hard glove index: JIS—M — 8 8 0 1
• non-thin coal many non-thin coals have a high hardness of H G I 80 or less and are inexpensive. Judgment of the hardness of coal with respect to a predetermined standard can be made, for example, by measuring the average H GI for each brand of coal and comparing these average values with a predetermined standard.
• a classification process for classifying into small coal, a first pulverization process for pulverizing the coal having a large particle diameter, coal treated in the first pulverization process, and a coal and coal having a small particle diameter (X ′ It is desirable to charge the coke oven after processing by the blending step of combining the remainder of) and the coal ( ⁇ ') and the second pulverization step of pulverizing the blended coal.
• the quality of coal such as hardness and inert amount
• the quality of coal varies depending on the brand, and it is desirable to adjust the grinding conditions for each brand and pulverize it. Therefore, it is preferable to arrange multiple coal tanks according to quality or brand of coal, and to arrange multiple crushers corresponding to the coal, so that the amount of inert gas is larger than that of coal (X ') and the coal (X').
• a first pulverizing step for pulverizing the coal having a large particle size, a coal treated in the first pulverizing step, and a coal opino having a small particle size 'Is treated by a first blending step in which the remainder of the coal ( ⁇ ') is blended and a second dusting step in which the blended coal is crushed, and a second blending the coal ( ⁇ '). It is preferable that the coal (X ′) and the coal (soot,) are charged into a coke oven by performing a blending step of the above and a third pulverization step of grinding the blended coal.
• a classification step of classifying into coal, a first pulverization step of pulverizing the coal having a large particle size, and a first pulverizing agent comprising the coal treated in the first pulverization step and the small particle size coal The coal is treated by a blending step and a second grinding step of grinding the blended coal,
• the coal ( ⁇ ') are preferably charged into a coke oven.
• the present invention relates to a method for producing coke using coal (X ′) having a large amount of inert and coal ( ⁇ ,) having a smaller amount of inert than the coal (X ′ :).
• the coal treated in the pulverization step is combined with at least a portion of the coal with a small particle size and / or the remainder of the coal (X ′) or at least a part of the coal ( ⁇ ′).
• Charging ( ⁇ ') into the coke oven can also be selected as a desirable method.
• coal ( ⁇ ,) it is effective to process only a part of the coal ( ⁇ ,) in the classification process and the first powdering process.
• the coal is separated into coal having a large particle size and coal having a small particle size, Even if the amount of coal that is pulverized into large-diameter coal is about 10% of the total amount of coal, the coal (X ') of the entire raw material is preferentially classified and pulverized to give a total As a result, the particle size distribution can be remarkably improved.
• the classification of coal (X ') and other coals is not strict, and the average amount of each coal brand must be specified and the average value exceeds the prescribed standard.
• the coal (X ′) may be classified into coal (X ′), and the coal (X ′) may partially contain coal having a hardness below a predetermined standard.
• Coal is known to have different amounts of inert (non-molten component) depending on the production area. Classifying the coal with a large amount of inert (i.e., ⁇ ) when the one with a large amount of inert is preferentially processed in the classification process ⁇ 1st crushing process, the brand of the raw coal used In addition, considering the coke production facility capacity, etc., the cost of cotas production will be set as appropriate so that production efficiency is optimized. However, it is particularly preferable to use coal with an inert amount of 35% or more as a coal with a large amount of inert coal (X,). As coal having an inert amount of 35% or more, it is preferable to use non-thin coal.
• coal inert amount is a predetermined standard (eg, inert amount of 35%). Can do.
• the coal is classified using both the standards of the hardness and the amount of the final component. It is desirable to preferentially treat hard and heavy inert materials in the classification process ⁇ first grinding process. In particular, it is desirable to preferentially treat coal having HGI of 80 or less and an inert amount of 35% or more in the classification step / first grinding step. Non-carburized coal is very suitable because it has many varieties with an HGI of 80 or less and an inert amount of 35% or more and is inexpensive.
• the classification particle size the particle size at the time of classification, for example, equivalent to the mesh size when classification using a sieve
• Fig. 3 is a graph illustrating the production cost of Kotas when the classified particle size in the classification process is changed.
• Coat strength increases as the classified particle size decreases, and the higher the Cotas strength, the lower the reflectivity (R o) of the coal used (mixed coal). After all, the classification particle size is small
• the cost of blended coal per unit production of Kotas decreases, and the merit in terms of cost increases (A in Fig. 3).
• the charging amount per kiln of the coke oven increases as the classified particle size increases, and the larger the charging amount per kiln, the higher the production amount of Kotas, which is the cost per unit production of Kotas.
• the production costs of Cotas will decrease, and the benefits in terms of cost will increase (B in Figure 3). Therefore, the total cost (C in Fig. 3), which is the cost of the production of coatus per unit production of coatas as a whole, decreases when the classified particle size is about 20 mm or less, and the classified particle size is 3 to 10 When it is about mm, it tends to be particularly low. Therefore, it is desirable in terms of cost to have a classified particle size of 1 to 20 mm, particularly preferably about 3 to 10 mm.
• the coatus strength was evaluated by the drum strength (D 1 3 0/1 5) of coatus.
• the amount of charge per kiln was evaluated with a kiln charge index that represents the filling rate of coal into the coke oven.
• the proportion on the small particle side is large, so that the desired classified particle size is 3 to 6 mm.
• the classified particle size can be easily adjusted, for example, by changing the mesh of the sieve when classifying coal.
• a classifier for classifying a part of the coal as the Kotas raw material into coal having a large particle size and coal having a small particle size, and pulverizing the coal having a large particle size A first pulverizer, a blending tank for blending the coal treated by the first pulverizer, the coal having a small particle diameter and the remainder of the coal as the coke raw material, and a coal blended in the blending tank It is preferable to use a coatus production facility characterized by comprising a pulverizer for pulverizing the coal and a conveyor for transporting the coal treated by the pulverizer to a coke oven.
• the quality of coal such as hardness and inert amount
• the quality of coal varies depending on the brand, and it is desirable to adjust the pulverization conditions for each brand. Therefore, distribution It is preferable to place multiple combined tanks according to the quality or brand of coal, and multiple breakers corresponding to the coal tank.
• Cotas which is characterized by comprising a transporter for transporting fresh coal to a coke oven. It is preferable to use an elephant facilities.
• blending tanks In addition to storing coal, blending tanks have the effect of homogenizing the properties of coal when charging into a coke oven by sequentially charging multiple brands of coal and cutting them into the mixing tank after storage. Only a single brand of coal may be stored in the same blending tank, but if it is mixed with other brands of coal on the conveyor after crushing, the brand of coal charged in the coke oven Is prevented from being partially biased.
• a sieve for classifying a part of the coal carried out from the coal yard, a first crusher for crushing the coal on the sieve classified by the sieve, and pulverizing with at least the first crusher
• a first blending tank that mixes and stores the coal that has been classified by the sieve and the sieve that has been classified by the sieve
• a second pulverizer that powders the coal cut out from the first blending tank
• a second compounding tank for storing the remaining coal transported from the coal yard
• a third pulverizer for pulverizing the coal cut out from the second compounding tank, and the second pulverizer.
• the production equipment of Kortas characterized by comprising a transporter for transporting the coal dusted in the above and the coal dusted by the third duster to a coke oven.
• a transporter for transporting the coal dusted in the above and the coal dusted by the third duster to a coke oven.
• coal other than coal classified by sieving can be stored. The mixing ratio of coal increases and the quality of product coatas becomes more uniform.
• the pulverization capacity of the first pulverizer is greater than the pulverization capacity of the second pulverizer.
• the “second pulverizer” has smaller powdering capacity than the “first pulverizer”. It is desirable to use
• FIG. 1 is a schematic view showing an embodiment of the production equipment for coatus according to the present invention.
• coal yard 1 and 2 a part of coal in coal yard 1 is unloaded and sieved with sieve 3, and the sieve a that exceeds the predetermined particle size is pulverized by first pulverizer 4 Charge to the first mixing tank 5.
• Sieve b is put in the first mixing tank 5 as it is.
• the remaining coal in Coal Yard 1 will be transported to the first blending tank 5 and second blending tanks 6 and 7 as they are.
• Coal Yard 2 coal is also transported to the first blending tank 5 and second blending tanks 6 and 7 as appropriate.
• the coal in the first mixing tank 5 is appropriately pulverized by the second pulverizer 8.
• the coal in the second mixing tank 6 is the third pulverizer 9
• the coal in the second mixing tank 7 is pulverized in the third pulverizer 10 as appropriate
• the coal pulverized in each pulverizer is a competitor, etc.
• the second blending tanks 6 and 7 are each installed in three tanks.
• the coal in the second blending tank 6 is crushed by the third powder mill 9 and the coal in the second blending tank 7 is the third.
• crushing with a crusher 10 crushing by brand can be performed.
• coal yard 1 be non-slightly caking coal and coal yard 2 be strongly caking coal.
• Cotas were produced using the coke production equipment shown in Fig. 1.
• the raw coal is 80% non-fine-coking coal and 20% strong-coking coal (HGI: approx. 85,
• HGI strong-coking coal
• HG I approx. 75
• inert acid approx. 36% of the non-mineral cohesive coal is 10%.
• Classification process On a sieve with a size of more than 6 mm, pulverize with a hammerhead type first pulverizer at 680 rpm (first pulverization process).
• Second pulverization step After throwing it into the first mixing tank together with some coal of 6 mm or less, it was pulverized (second pulverization step) at 570 rpm with a hammerhead type second pulverizer. The remaining non-mineral coking coal and strong caking coal are separately pulverized at 600 rpm with a plurality of hammerhead-type third crushers (third crushing step) and sieved. Coat was mixed with pulverized non-thin coal on a conveyor and charged into a coke oven to produce Cotas.
• Example of the present invention As comparative example 1, non-slightly coking coal and strongly caking coal are separately pulverized (equivalent to the third pulverization step), mixed on a conveyor, and charged into coke trough. The production of Kotas by the method was also carried out. Further, as Comparative Example 2, a coatus was produced in the same manner as in the present invention except that the classification step was not performed.
• Fig. 2 shows the coal powder before charging the coke oven manufactured using the method of the present invention.
• the particle size distribution of (mixed coal) is shown. It also shows the particle size distribution of the blended coal in the conventional case, which is Comparative Example 1 and does not use the classification step and the first grinding step. Also shown is the particle size distribution of the blended coal in Comparative Example 2, which does not use only the classification process. When the method of the present invention is used, it can be seen that the particle size distribution is narrower than in Comparative Example 1 and Comparative Example 2, and that coal particles having a preferred particle size in the range of 0.5 to 6 mm are increased. .
• the drum strength (DI) of the manufactured Kotas was measured.
• the drum strength (DI 30 No. 15) of the coatus produced by the method of the present invention is 94.2
• the drum strength (DI 30/1/5) of the conventional coatus of Comparative Example 1 and Comparative Example 2 is 94.2.
• DI 3 0 Z 1 5 is 30 revolutions at a speed of 15 revolutions per minute according to the rotational strength test method of JISK 2 1 5 1 (2 Drum strength measured under the conditions of
• the Kotas was manufactured using the Kotas manufacturing facility shown in FIG.
• raw material coal 80% non-microcoking coal and 20% strong caking coal (HG I: approx. 85, amount of inerting approx. 30%) are used.
• 30% non-thin cohesive coal HG I: approx. 75, amount of inerting approx. 3 6% is screened (classification process).
• Comparative Example 1 As a comparative example 1, conventional manufacturing, in which non-micro-coking coal and strong coking coal are separately pulverized (equivalent to the third pulverizing step only), mixed on a competitor and charged into a coke oven. The coke was also produced by this method. Further, as Comparative Example 2, a coatus was produced in the same manner as in the present invention except that the classification step was not performed.
• the drum strength (DI) of the manufactured Kotas was measured.
• the drum strength (D 1 30 1 5) of the coatus manufactured by the method of the present invention is 94.3
• the drum strength (DI 3 0/1 5) of the conventional coatus of comparative example 1 and comparative example 2 is Compared to 94.0 and 94.1 respectively, they improved by 0.3% and 0.2%, respectively. If coke with the same level of strength as conventional is produced, the proportion of non-thin cohesive coal can be increased from the conventional 80%, 82% to 87%. It turns out that it can reduce.
• the Kotas was manufactured using the Kotas manufacturing facility shown in FIG.
• raw material coal 80% non-microcoking coal and 20% strong caking coal (HG I: about 85, amount of inert about 30%).
• 30% non-thin cohesive coal HG I: approx. 75, inert amount approx. 22%) is screened (classification process).
• the drum strength (D I) of the manufactured Kotas was measured.
• the drum strength (DI 3 0 1 5) of the coatus manufactured by the method of the present invention is 94.1
• the drum strength (DI 3 0/1 5) of the conventional coatus of Comparative Example 1 and Comparative Example 2 is 94.1. Compared to 94.0 and 95.0%, respectively, they improved by 0.1% and 0.05%, respectively.
• the ratio of non-microcohesive coal could be increased to 80% or more, and the cost of the coata could be reduced.

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