WO2020155648A1 - 一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺 - Google Patents

一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺 Download PDF

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WO2020155648A1
WO2020155648A1 PCT/CN2019/106920 CN2019106920W WO2020155648A1 WO 2020155648 A1 WO2020155648 A1 WO 2020155648A1 CN 2019106920 W CN2019106920 W CN 2019106920W WO 2020155648 A1 WO2020155648 A1 WO 2020155648A1
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coal
equipment
product
sieve
coking
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PCT/CN2019/106920
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English (en)
French (fr)
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桂夏辉
杨自立
邢耀文
夏阳超
徐梦迪
曹亦俊
刘炯天
夏灵勇
程宏志
魏昌杰
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中国矿业大学
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens

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  • the present invention designs a multi-stage dissociation-mechanical column combined re-preparation process of medium-coal conjoined bodies of fat coal, and is especially suitable for a multi-stage dissociation of coking-fat coal contiguous bodies used in the field of coal dissociation and reconcentration of coking fat coal.
  • Separation-machine column combined reselection process is especially suitable for a multi-stage dissociation of coking-fat coal contiguous bodies used in the field of coal dissociation and reconcentration of coking fat coal.
  • Coking fat coal is a scarce coal in my country and a national strategic material, but its reserves account for less than one-third of the total coal reserves. Due to the common characteristics of poor coal quality and high content of impurities in coking coal, the sorting produces 20%-30% of medium coal. With the deterioration of resource conditions, the sorting of coking coal shows a deteriorating trend. Its outstanding performance is that the coking fat coal has a large contiguous body content, and the inorganic minerals and organic coal rock components are closely connected, which is difficult to sort. However, the coal ash content in the coking fat coal is generally about 35%, which contains a large amount of clean coal. Due to the high ash content of coal in a large amount of coking fat coal, it is difficult to sort and can only be used as steam coal, resulting in a great waste of scarce coking fat coal resources and loss of economic benefits.
  • the basic feature of coking coal in coking coal is that low-ash coal and high-ash gangue are intertwined with each other and closely co-exist to form a medium-coal conjoined body. It is impossible to obtain qualified clean coal products through direct separation. Therefore, the prerequisite for re-selection of coking fat coal is the effective dissociation of middle coal. After the coal in the coking fertilizer coal is dissociated, flotation is the main method to realize the separation, but in the dissociation process, it will inevitably be accompanied by the crushing of the gangue to form high-ash fine mud.
  • Patent Announcement No. CN101757982A is a coal slime separation process. Considering the influence of coking fat coal contiguous body on the flotation recovery rate, the contiguous body grinding dissociation and re-flotation process is adopted, but this will increase the recovery rate of clean coal.
  • Patent Announcement No. CN106669960A is a dissociation and re-selection process of coking fine coal. Taking into account the large content of clay minerals and conjoined coal in the washed fine particles, it adopts the pre-throwing-rapid grinding coal dissociation process to reduce The content of clay minerals after grinding, but the flotation column is completely used in the separation stage, and the separation efficiency of the equipment is not considered. The recovery rate of low ash coarse particles is low, and the recovery rate of clean coal is reduced. The process needs to be further optimized.
  • the multi-stage dissociation-mechanical column combined re-selection process of the coking fat coal of the present invention is characterized by:
  • the secondary sorting equipment completes the sorting, and the products under the tertiary sieve are fed to the tertiary series sorting equipment.
  • the final secondary sorting equipment and the tertiary series sorting equipment both output clean coal and tailings to complete the sorting.
  • the coarse grinding equipment is a self-mill or rod mill; the fine grinding equipment is a stirring mill or a ball mill.
  • the primary classification screening equipment I is a high frequency screen or hydrocyclone; the secondary classification screening equipment II is a high frequency screen or hydrocyclone; the third classification screening equipment III is high frequency screen or hydrocyclone.
  • the primary separation equipment and the secondary separation equipment are both flotation machines; the tertiary series separation equipment is two flotation columns arranged in series, the clean coal outlet of one flotation column and the other flotation column Connected to the feed inlet.
  • the sieve aperture of the screening equipment for the primary classification is 0.5 mm or 100 mm in diameter
  • the sieve aperture of the sieve equipment for the secondary classification is 0.25 mm or the diameter is 75 mm
  • the sieve of the screening equipment for the third classification The hole diameter is 0.074mm or the diameter is 50mm.
  • the multi-stage dissociation, grading flotation, and the combined re-selection process of coal in coking fertilizer coal based on the multi-stage dissociation of the coal in the coking fertilizer coal are proposed to realize the effective dissociation of the coal in the coking fertilizer coal, and this is achieved through the adaptation of the separation materials and the characteristics of the separation equipment Effective recovery of coal resources in coking fat coal.
  • the main advantages are:
  • the two-stage fast rod mill ensures that the coal contiguous materials in the coking fertilizer coal are fully dissociated.
  • the rapid coarse grinding equipment reduces the occurrence of the over-crushing of the middle coal.
  • the fine grinding equipment ensures the effective dissociation of the coal and contiguous bodies. ;
  • the one-time sorting equipment used for sorting has the effect of "throwing tails", that is, reducing the amount of subsequent fine grinding treatment, while reducing the ash content of the subsequent sorting materials, and reducing the fineness caused by the non-selective grinding of high-ash particles.
  • the severity of sludge pollution to clean coal effectively guarantees the ash content of clean coal;
  • the product is classified by flotation, the coarse-grained product is fed into the flotation machine for separation, and the fine-grained product is fed into the series flotation column for separation. It uses the advantages of the flotation machine to process coarse particles and the flotation column to process fine particles to significantly improve the separation efficiency of the equipment, maximize the recovery of the clean coal in the coking fat coal, and ensure the yield of clean coal and the ash content of clean coal.
  • Figure 1 is a block diagram of the process flow of the present invention.
  • FIG. 2 is a block diagram of the process flow of the present invention.
  • the multi-stage dissociation-mechanical column combined re-selection process of the medium coal conjoined body of coking fat coal is as follows:
  • the coal in the coking fertilizer coal is fed to the rapid coarse grinding equipment for screening.
  • the coarse grinding equipment is a self-grinding machine or rod mill.
  • the products obtained after being coarsely ground by the rapid coarse grinding equipment are fed to the screening equipment I for one screening.
  • the screening equipment I is a high-frequency screen or a hydrocyclone to obtain the product on the first sieve and the product under the first sieve;
  • the fine grinding equipment is a stirring mill or a ball mill.
  • the product after fine grinding is fed to the screening equipment II for secondary screening.
  • the screening equipment II is a high-frequency screen or Hydrocyclone to obtain secondary over-screen product and secondary under-screen product;
  • the sieving equipment III is a high-frequency sieve or hydrocyclone to obtain a third sieve.
  • the upper product and the third sieve product; the third sieve product is fed to the secondary separation equipment to complete the separation, the primary separation equipment and the second separation equipment are both flotation machines, and the third sieve product is fed to the third serial separation equipment.
  • the sorting is completed, and the final secondary sorting equipment and tertiary series sorting equipment both output clean coal and tailings to complete the sorting.
  • the tertiary series separation equipment is two flotation columns arranged in series, and the clean coal outlet of one flotation column is connected with the inlet of the other flotation column.
  • the sieve aperture of the screening equipment for the primary classification is 0.5mm or 100mm in diameter
  • the sieve aperture of the sieve equipment for the secondary classification is 0.25mm or 75mm in diameter
  • the sieve aperture of the sieve equipment for the third classification is 0.074mm or 50mm in diameter.
  • the coal in the coking fertilizer coal is fed into a fast coarse grinding device; the fast rough grinding device is a self-grinding machine or a rod mill.
  • the product obtained after coarse grinding is fed to the screening equipment for one screening to obtain an on-screen product and a down-screen product.
  • the screening equipment is a high-frequency sieve with a sieve aperture of 0.5 mm or a hydraulic sieve with a diameter of 100 mm.
  • the cyclone returns the product on the primary screen to the rapid coarse grinding equipment, and feeds the product under the primary screen to the separation equipment for a separation.
  • the primary separation equipment is flotation machine I, and the primary separation tail is obtained.
  • Coal and primary separation clean coal is fed into the fine grinding equipment, which is a stirring mill or a ball mill; the product obtained after the fine grinding is fed into the screening equipment for secondary screening, so
  • the secondary screening equipment mentioned is a high-frequency sieve with a pore size of 0.25 mm or a hydrocyclone with a diameter of 75 mm to obtain the secondary sieve product and the secondary sieve product; the secondary sieve product is returned to the inlet Fine grinding equipment; the product on the secondary screen is fed to the screening equipment for three screenings.
  • the three screening equipment is a high-frequency sieve with a sieve aperture of 0.074mm or a hydrocyclone with a diameter of 50mm to obtain three
  • the secondary separation equipment is a float Separator II
  • the tertiary series separation equipment consists of two flotation columns in series to obtain tertiary tailings and tertiary cleaned coal; finally, primary tailings, secondary tailings and tertiary tailings are discharged as final tailings, and the secondary refined Coal and tertiary clean coal are synthesized and finally clean coal is discharged to complete the separation.
  • the coal in the coking fertilizer coal is fed into a self-mill or rod mill for coarse grinding, and the product after coarse grinding is fed into a high-frequency sieve with a sieve aperture of 0.5 mm or a hydrocyclone with a diameter of 100 mm.
  • the model is screened once, the screened product is returned to the fast coarse grinding equipment for re-coarse grinding, and the screened product is fed to the flotation machine I as the sorting equipment for a flotation, after the flotation
  • Obtain primary separation tailings and primary separation clean coal feed the primary separation clean coal into a stirring mill or ball mill for fine grinding; feed the product after fine grinding into a high-frequency sieve or diameter with a pore size of 0.25 mm
  • the secondary sieve product is returned to the mixing mill or ball mill for fine grinding; the secondary sieve is lowered
  • the product is fed into a high-frequency sieve with a sieve aperture of 0.074mm or a hydrocyclone with a diameter of 50mm for three sieving, and the product on the third sieve and the product under the third sieve are obtained; the product on the third sieve is sent to the flotation machine II for two
  • the second sorting is used to obtain the second tailings and the second clean coal;
  • the second clean coal continues to be fed to the flotation column for the third separation clean coal obtained from the previous separation, and the products under the third sieve are fed to the flotation column to obtain three times Tailings and tertiary cleaned coal; finally, the primary, secondary, and tertiary tailings are discharged as final tailings, and the secondary cleaned coal and tertiary cleaned coal are combined into the final cleaned coal and discharged to complete the separation.

Abstract

一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺，属于煤炭分选方法。将焦肥煤中煤给入快速粗磨设备；将粗磨后所得产物给入筛分设备；将一次筛上产物返回给入快速粗磨设备，将一次筛下产物给入分选设备，将一次分选精煤给入细磨设备；将细磨后所得产物给入筛分设备进行二次筛分，将二次筛上产物返回给入细磨设备，将二次筛上产物给入筛分设备进行三次筛分；筛上产物给入二次分选设备完成分选，筛下产物给入串联的分选设备完成分选。实现了嵌布粒度细的中煤连生体解离，采用分级浮选有效的提高粗颗粒的回收率和细颗粒的选择性，保证精煤回收率和精煤灰分，该工艺流程简单可靠，最大程度回收焦肥煤中煤中的精煤。

Description

一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺 技术领域
本发明设计一种肥煤的中煤连生体多段解离-机柱联合再选工艺，尤其是适用于一种焦肥煤中煤解离再选领域使用的焦肥煤中煤连生体多段解离-机柱联合再选工艺
背景技术
焦肥煤是我国稀缺性煤种，国家战略性物质，但其储量占煤炭资源总储量不到三分之一的焦肥煤。由于焦肥煤普遍存在煤质品质差，杂物含量赋存多等特点，分选中产生20％～30％的中煤，随着资源条件的恶化，焦肥煤分选呈现恶化趋势。其突出表现为焦肥煤连生体含量大，无机矿物质和有机煤岩组分紧密连生，分选难度大，但焦肥煤中煤灰分含量一般在35％左右，含有大量的精煤。大量的焦肥煤中煤由于灰分高，难以分选只能作为动力煤，造成了稀缺焦肥煤资源的极大浪费和经济效益的损失。
焦肥煤中煤的基本特点是低灰分的煤和高灰分的矸石相互嵌布，紧密共生，形成中煤连生体，无法通过直接分选得到合格的精煤产品。因此，焦肥煤中煤再选的前提是中煤的有效解离。焦肥煤中煤解离后，浮选是实现分选的主要方法，但在解离过程中不可避免的会伴随有矸石的粉碎，形成高灰细泥，在分选过程中，由于水流夹带和机械罩盖，造成高灰细泥污染，使得精煤灰分难以达标，普遍存在精煤回收率和精煤灰分之间的矛盾，即为了获得合格灰分的精煤，需要降低精煤回收率。专利公告号CN101757982A的一种煤泥分选工艺，考虑到焦肥煤连生体对浮选回收率的影响，采取了连生体磨矿解离再浮选的工艺，但是这会提高精煤回收率，在另一方面，磨细后的产品细泥含量增加，精煤灰分难以得到保证，所以该工艺需要进一步的完善。专利公告号CN106669960A的一种炼焦细粒中煤的解离再选工艺，考虑到了对入洗细粒中煤黏土矿物和连生体含量大，采取预先抛尾-快速磨煤解离工艺，减少了磨后黏土矿物含量，但分选阶段完全采用浮选柱，没有考虑设备的分选效率问题，对低灰粗颗粒回收率较低，降低了精煤回收率，工艺有待进一步优化。因此，开发新的焦肥煤中煤分选工艺，通过工艺创新，实现焦肥煤中煤有效解离和高效分选，最大程度回收稀缺焦肥煤中煤是提高资源利用率和煤炭企业经济效益的关键所在。
发明内容
针对上述技术的不足之处，提供一种步骤简单，使用效率高从根本上解决了现存的稀缺焦肥煤资源无法回收再利用的中煤再选问题的焦肥煤的中煤连生体多段解离-机柱联合再选工。
为了实现技术上述目的，本发明焦肥煤的中煤连生体多段解离-机柱联合再选工艺，其特征在于：
将焦肥煤中煤给入快速粗磨设备进行筛分，将经过快速粗磨设备粗磨后所得产物给入筛 分设备Ⅰ进行一次筛分，得到一次筛上产物和一次筛下产物；
将一次筛上产物返回给入快速粗磨设备重新粗磨，将一次筛下产物给入一次分选设备进行一次分选，得到一次分选尾煤和一次分选精煤，尾煤排出；
将一次分选精煤给入细磨设备细磨，将细磨后所得产物给入筛分设备Ⅱ进行二次筛分，得到二次筛上产物和二次筛下产物；
将二次筛上产物返回给入细磨设备重新细磨，将二次筛上产物给入筛分设备Ⅲ进行三次筛分，得到三次筛上产物和三次筛下产物；三次筛上产物给入二次分选设备完成分选，三次筛下产物给入三次串联分选设备，最终二次分选设备和三次串联分选设备均输出精煤和尾煤完成分选。
所述的粗磨设备为自磨机或棒磨机；所述的细磨设备为搅拌磨或球磨机。
所述的一次分级的筛分设备Ⅰ为高频筛或水力旋流器；所述的二次分级的筛分设备Ⅱ为高频筛或水力旋流器；所述的三次分级的筛分设备Ⅲ为高频筛或水力旋流器。
所述的一次分选设备和二次分选设备均为浮选机；三次串联分选设备为两台串联设置的浮选柱，一台浮选柱的精煤出口与另一台浮选柱的入料口相连接。
所述的一次分级的筛分设备的筛孔孔径为0.5mm或直径为100mm，进行二次分级的筛分设备的筛孔孔径为0.25mm或直径为75mm；进行三次分级的筛分设备的筛孔孔径为0.074mm或直径为50mm。
有益效果：
提出了基于焦肥煤中煤连生体多段解离，分级浮选，机柱联合再选工艺，实现了焦肥煤中煤有效解离，并通过分选物料与分选设备特性适配来实现焦肥煤中煤资源的有效回收。主要优点有：
a.两段快速棒磨保证了焦肥煤中煤连生体的物料得到充分解离，采用快速粗磨设备减少了中煤过粉碎现象发生，细磨设备保证了煤和连生体的有效解离；
b.使用的一次分选设备分选，具有“抛尾”作用，即降低了后续细磨处理量，同时降低了后续分选入料灰分，减少了高灰颗粒无选择性磨矿带来细泥污染精煤严重程度，有效的保证了精煤灰分；
c.充分实现了分选物料与分选设备特性适配，细磨后产物，采用分级浮选，粗粒级产物给入浮选机分选，细粒级产物给入串联的浮选柱分选，利用浮选机处理粗颗粒和浮选柱处理细颗粒的优势，显著提高设备分选效率，最大程度回收焦肥煤中煤中的精煤，保证了精煤产率和精煤灰分。
d.本发明提出的分选工艺流程简单、技术成熟、投资少、运行费用低，经济效益显著。
附图说明
图1是本发明的工艺流程框图。
图2是本发明的工艺流程框图。
具体实施方式
下面结合附图对本发明的实施作进一步的描述：
如图1所示，焦肥煤的中煤连生体多段解离-机柱联合再选工艺，其步骤为：
将焦肥煤中煤给入快速粗磨设备进行筛分，粗磨设备为自磨机或棒磨机，将经过快速粗磨设备粗磨后所得产物给入筛分设备Ⅰ进行一次筛分，筛分设备Ⅰ为高频筛或水力旋流器，得到一次筛上产物和一次筛下产物；
将一次筛上产物返回给入快速粗磨设备重新粗磨，将一次筛下产物给入一次分选设备进行一次分选，得到一次分选尾煤和一次分选精煤，尾煤排出；
将一次分选精煤给入细磨设备细磨，细磨设备为搅拌磨或球磨机，将细磨后所得产物给入筛分设备Ⅱ进行二次筛分，筛分设备Ⅱ为高频筛或水力旋流器，得到二次筛上产物和二次筛下产物；
将二次筛上产物返回给入细磨设备重新细磨，将二次筛上产物给入筛分设备Ⅲ进行三次筛分，筛分设备Ⅲ为高频筛或水力旋流器，得到三次筛上产物和三次筛下产物；三次筛上产物给入二次分选设备完成分选，一次分选设备和二次分选设备均为浮选机，三次筛下产物给入三次串联分选设备完成分选，最终二次分选设备和三次串联分选设备均输出精煤和尾煤完成分选。
三次串联分选设备为两台串联设置的浮选柱，一台浮选柱的精煤出口与另一台浮选柱的入料口相连接。
一次分级的筛分设备的筛孔孔径为0.5mm或直径为100mm，进行二次分级的筛分设备的筛孔孔径为0.25mm或直径为75mm；进行三次分级的筛分设备的筛孔孔径为0.074mm或直径为50mm。
实施例一
将焦肥煤中煤给入快速粗磨设备；所述的快速粗磨设备为自磨机或棒磨机。将粗磨后所得产物给入筛分设备进行一次筛分，得到一次筛上产物和一次筛下产物，所述的筛分设备为筛孔孔径为0.5mm的高频筛或直径为100mm的水力旋流器，将一次筛上产物返回给入快速粗磨设备，将一次筛下产物给入分选设备进行一次分选，所述的一次分选设备为浮选机Ⅰ，得到一次分选尾煤和一次分选精煤；将一次分选精煤给入细磨设备，所述的细磨设备为搅拌磨或球磨机；将细磨后所得产物给入筛分设备进行二次筛分，所述的二次筛分设备为筛孔孔径为0.25mm的高频筛或直径为75mm的水力旋流器，得到二次筛上产物和二次筛下产物；将二次筛上产物返回给入细磨设备；将二次筛上产物给入筛分设备进行三次筛分，所述的三 次筛分设备为筛孔孔径为0.074mm的高频筛或直径为50mm的水力旋流器，得到三次筛上产物和三次筛下产物；三次筛上产物给入二次分选设备完成分选，三次筛下产物给入串联的三次分选设备完成分选，所述的二次分选设备为浮选机Ⅱ，三次串联分选设备为两台浮选柱串联，获得三次尾煤和三次精煤；最终将一次尾煤、二次尾煤和三次尾煤作为最终尾煤排出，将二次精煤和三次精煤合成最终精煤排出从而完成分选。
实施例二
如图2所示，焦肥煤中煤给入自磨机或者棒磨机中进行粗磨，粗磨后产物给入筛孔孔径为0.5mm的高频筛或直径为100mm的水力旋流器机型进行一次筛分，筛分后的筛上产物返回给入快速粗磨设备重新粗磨，一次筛下产物给入作为分选设备的浮选机Ⅰ进行一次分选浮选，浮选后得到一次分选尾煤和一次分选精煤；将一次分选精煤给入搅拌磨或者球磨机中进行细磨；将细磨后所得产物给入筛孔孔径为0.25mm的高频筛或直径为75mm的水力旋流器进行二次筛分，二次筛分后得到二次筛上产物和二次筛下产物，二次筛上产物返回搅拌磨或者球磨机继续细磨；将二次筛下产物给入筛孔孔径为0.074mm的高频筛或直径为50mm的水力旋流器进行三次筛分，得到三次筛上产物和三次筛下产物；三次筛上产物给入浮选机Ⅱ做二次分选，得到二次尾煤和二次精煤；二次精煤继续给入浮选柱做上次分选获得的三次分选精煤，三次筛下产物给入浮选柱，获得三次尾煤和三次精煤；最终将一次尾煤、二次尾煤和三次尾煤作为最终尾煤排出，将二次精煤和三次精煤合成最终精煤排出从而完成分选。

Claims (5)

  1. 一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺，其特征在于：
    将焦肥煤中煤给入快速粗磨设备进行筛分，将经过快速粗磨设备粗磨后所得产物给入筛分设备Ⅰ进行一次筛分，得到一次筛上产物和一次筛下产物；
    将一次筛上产物返回给入快速粗磨设备重新粗磨，将一次筛下产物给入一次分选设备进行一次分选，得到一次分选尾煤和一次分选精煤，尾煤排出；
    将一次分选精煤给入细磨设备细磨，将细磨后所得产物给入筛分设备Ⅱ进行二次筛分，得到二次筛上产物和二次筛下产物；
    将二次筛上产物返回给入细磨设备重新细磨，将二次筛上产物给入筛分设备Ⅲ进行三次筛分，得到三次筛上产物和三次筛下产物；三次筛上产物给入二次分选设备完成分选，三次筛下产物给入三次串联分选设备分选，最终二次分选设备和三次串联分选设备均输出精煤和尾煤完成分选。
  2. 根据权利要求1所述的一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺，其特征在于：所述的粗磨设备为自磨机或棒磨机；所述的细磨设备为搅拌磨或球磨机。
  3. 根据权利要求1所述的一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺，其特征在于：所述的一次分级的筛分设备Ⅰ为高频筛或水力旋流器；所述的二次分级的筛分设备Ⅱ为高频筛或水力旋流器；所述的三次分级的筛分设备Ⅲ为高频筛或水力旋流器。
  4. 根据权利要求1所述的一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺，其特征在于：所述的一次分选设备和二次分选设备均为浮选机；三次串联分选设备为两台串联设置的浮选柱，一台浮选柱的精煤出口与另一台浮选柱的入料口相连接。
  5. 根据权利要求2所述的一种焦肥煤的中煤连生体多段解离-机柱联合再选工艺，其特征在于：所述的一次分级的筛分设备的筛孔孔径为0.5mm或直径为100mm，进行二次分级的筛分设备的筛孔孔径为0.25mm或直径为75mm；进行三次分级的筛分设备的筛孔孔径为0.074mm或直径为50mm。
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