WO2020155422A1 - 一种难选动力煤分选工艺 - Google Patents

一种难选动力煤分选工艺 Download PDF

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WO2020155422A1
WO2020155422A1 PCT/CN2019/083664 CN2019083664W WO2020155422A1 WO 2020155422 A1 WO2020155422 A1 WO 2020155422A1 CN 2019083664 W CN2019083664 W CN 2019083664W WO 2020155422 A1 WO2020155422 A1 WO 2020155422A1
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particle size
coal
medium
products
fed
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French (fr)
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桂夏辉
李明
邢耀文
夏阳超
曹亦俊
刘炯天
夏灵勇
刘太顺
程宏志
魏昌杰
佟顺增
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KAILUAN (GROUP) CO Ltd
TIANDI (TANGSHAN) MINING TECHNOLOGY Co Ltd
China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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KAILUAN (GROUP) CO Ltd
TIANDI (TANGSHAN) MINING TECHNOLOGY Co Ltd
China University of Mining and Technology CUMT
China University of Mining and Technology Beijing CUMTB
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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

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  • the invention relates to a separation process of thermal coal, in particular to a separation process of difficult-to-select thermal coal suitable for the crushing and re-selection of medium coal.
  • the sorting of medium-selectable or difficult-to-sort coal has poor sorting effect for difficult-to-sort or extremely difficult-to-sort thermal coal;
  • the jigging and gangue removal process uses water medium instead of heavy medium as sorting medium, although the cost
  • the heavy medium separation process is low but the separation accuracy is not high, so it is not suitable for difficult and extremely difficult coal separation;
  • the full-grade heavy medium separation process has high separation accuracy and strong applicability to the quality of raw coal, but this process Intensify the contact and convection between the material and the heavy medium suspension, which will increase the amount of secondary slime in the system, thereby indirectly increasing the washing cost;
  • lump coal heavy medium gangue coal is not selected in the separation process than the full grade
  • the processing cost per ton of coal in the heavy-medium separation process is low, and it is suitable for the separation of thermal coal with large lump coal content and low ash content of fine coal.
  • the difficult-to-select steam coal separation process of the present invention includes the following steps:
  • the part of the raw coal with a particle size greater than 50mm is dry-separated by the post screen to obtain clean coal, medium coal and gangue.
  • the medium coal is fed into the post screen to continue the separation, and the airflow classifier I is used for the particle size less than 50mm.
  • the part is sieved, and the products with a particle size of 13-50mm and those with a particle size of less than 13mm are selected by sieving, and the products with a particle size of 13-50mm are sent to the heavy medium shallow groove separator for wet separation. Refine coal, medium coal and gangue and recover qualified media.
  • the medium coal stream is first fed into the roller mill for crushing and then fed into the classification screen for screening, and the product with a particle size of less than 13mm is fed into the airflow classifier II for separation.
  • Products with a particle size of 3-13mm and products with a particle size of less than 3mm are sieved to obtain products with a particle size of more than 3mm and products with a particle size of less than 3mm.
  • the products with a particle size of more than 3mm are sorted by Air Classifier II
  • Products with a particle size of 3-13mm are fed into a three-product heavy-medium cyclone for separation to obtain clean coal, medium coal and gangue and recover qualified media.
  • medium coal is continuously fed to the roller mill for crushing and sieving.
  • the products with a particle size of less than 3mm and the products with a particle size of less than 3mm after being sorted by Air Classifier II are fed into the desliming sieve for sieving.
  • the products on the sieve and those under the sieve are selected by the sieve and the products on the sieve are fed into The spiral separator is separated to obtain clean coal, medium coal and gangue, and the under-sieve product is fed to the filter press for dehydration to obtain slime.
  • a Feed the raw coal into the post-screening sieve for pre-screening. After sieving, the oversieve with a particle size greater than 50mm and the undersieve with a particle size less than 50mm are obtained, and the oversieve is fed to the intelligent dry separator for sorting and obtaining Clean coal, gangue and mid-coal materials, feed mid-coal materials into the impact crusher and return to the post screen for selection;
  • the medium coal obtained by the arc sieve of the medium coal is crushed by a roller compactor and then fed into a grading sieve for classification to obtain products with a particle size greater than 3mm and products with a particle size less than 3mm.
  • the particle size obtained by the air classifier I For products smaller than 13mm, feed into the airflow classifier II to obtain products with a particle size of 3-13mm and products with a particle size of less than 3mm.
  • the product with a particle size larger than 3mm and the product with a particle size of 3-13mm obtained by the air classifier II are fed into the three-product heavy-medium cyclone for separation, and the refined coal is selected by arc sieve
  • Use a magnetic separator to recover qualified media and magnetic tails from the thin media and use a medium coal arc screen to obtain medium coal, qualified media and thin media and use a magnetic separator to recover qualified media and thin media from the thin media.
  • the medium and the magnetic tail are fed into the roller compactor to be crushed and fed into the grading screen.
  • the gangue arc screen is used to obtain gangue, qualified media and thin media, and the magnetic separator is used to recover qualified media and magnetic tails from the thin media;
  • the products with a particle size of less than 3mm after sieving by the grading sieve and the product with a particle size of less than 3mm obtained by the air classifier II are fed into the desliming screen with a grading particle size of 1mm, and the product with a particle size greater than 1mm is fed into the spiral
  • the separator is used to separate clean coal, medium coal and gangue, and the product with a particle size of less than 1mm is fed to the filter press to obtain slime.
  • the media removal equipment adopts an arc screen.
  • the coarse particles are dry sorted, the medium and fine particles are wet sorted, the medium coal is crushed and then sorted, the coarse particles (+50mm) are sorted by the intelligent dry sorter, and the medium particles (13-50mm) are shallow in the heavy medium. Trough separation and fine particle (1-3mm) three-product heavy-medium cyclone separation process to obtain low-cost, high-recovery steam coal products.
  • the process of dry separation after pre-screening of raw coal, wet separation after dry classification and wet separation after dry classification, and re-selection of medium coal after crushing is used to realize low-cost separation of difficult-to-select steam coal, which not only solves the problem of sludge The impact of the sorting process, and solve the contradiction between sorting accuracy and product recovery rate.
  • the raw coal is classified by dry method.
  • the classification equipment includes a rear screen and an air flow classifier to ensure that the coal does not encounter water before separation, minimize the degree of sludge, reduce the generation of secondary slime, and solve the degree of sludge. Impact on the sorting process;
  • Figure 1 is a flow chart of the separation process in the present invention.
  • the difficult-to-select steam coal separation process of the present invention has the following steps:
  • A fresh separation greater than 50mm, medium coal crushing and re-selection operations
  • B 13-50mm wet separation, medium coal crushing and re-selection operations
  • C 3-13mm wet separation, medium coal crushing and re-selection Operation:
  • D 1-3mm wet separation, 0-1mm pressure filter slime operation;
  • the part of the raw coal with a particle size greater than 50mm is dry-separated by the post screen to obtain clean coal, medium coal and gangue.
  • the medium coal is fed into the post screen to continue the separation, and the airflow classifier I is used for the particle size less than 50mm.
  • the part is sieved, and the products with a particle size of 13-50mm and those with a particle size of less than 13mm are selected by sieving, and the products with a particle size of 13-50mm are sent to the heavy medium shallow groove separator for wet separation. Refine coal, medium coal and gangue and recover qualified media.
  • the medium coal stream is first fed into the roller mill for crushing and then fed into the classification screen for screening, and the product with a particle size of less than 13mm is fed into the airflow classifier II for separation.
  • Products with a particle size of 3-13mm and products with a particle size of less than 3mm are sieved to obtain products with a particle size of more than 3mm and products with a particle size of less than 3mm.
  • the products with a particle size of more than 3mm are sorted by Air Classifier II
  • Products with a particle size of 3-13mm are fed into a three-product heavy-medium cyclone for separation to obtain clean coal, medium coal and gangue and recover qualified media.
  • medium coal is continuously fed to the roller mill for crushing and sieving.
  • the products with a particle size of less than 3mm and the products with a particle size of less than 3mm after being sorted by Air Classifier II are fed into the desliming sieve for sieving.
  • the products on the sieve and those under the sieve are selected by the sieve and the products on the sieve are fed into The spiral separator is separated to obtain clean coal, medium coal and gangue, and the under-sieve product is fed to the filter press for dehydration to obtain slime.
  • a Feed the raw coal into the post-screening sieve for pre-screening. After sieving, the oversieve with a particle size greater than 50mm and the undersieve with a particle size less than 50mm are obtained, and the oversieve is fed to the intelligent dry separator for sorting and obtaining Clean coal, gangue and mid-coal materials, feed mid-coal materials into the impact crusher and return to the post screen for selection;
  • the medium coal obtained by the arc sieve of the medium coal is crushed by a roller compactor and then fed into a grading sieve for classification to obtain products with a particle size greater than 3mm and products with a particle size less than 3mm.
  • the particle size obtained by the air classifier I For products smaller than 13mm, feed into the airflow classifier II to obtain products with a particle size of 3-13mm and products with a particle size of less than 3mm.
  • the product with a particle size larger than 3mm and the product with a particle size of 3-13mm obtained by the air classifier II are fed into the three-product heavy-medium cyclone for separation, and the refined coal is selected by arc sieve
  • Use a magnetic separator to recover qualified media and magnetic tails from the thin media and use a medium coal arc screen to obtain medium coal, qualified media and thin media and use a magnetic separator to recover qualified media and thin media from the thin media.
  • the medium and the magnetic tail are fed into the roller compactor to be crushed and fed into the grading screen.
  • the gangue arc screen is used to obtain gangue, qualified media and thin media, and the magnetic separator is used to recover qualified media and magnetic tails from the thin media;
  • the de-medium equipment adopts an arc screen.
  • the difficult-to-select steam coal separation process of the present invention includes the use of Bohou screens, intelligent dry separators, impact crushers, air current classifiers, heavy medium shallow trough separators, media separators, magnetic separators, and roller crushers , Dense medium cyclone, desliming screen, spiral separator and filter press.
  • Bohou screens intelligent dry separators, impact crushers, air current classifiers, heavy medium shallow trough separators, media separators, magnetic separators, and roller crushers , Dense medium cyclone, desliming screen, spiral separator and filter press.
  • the selected raw coal is pre-screened by the Bohou sieve (the sieve size is 50mm), and the screened material (+50mm) after sieving enters the intelligent dry separator for separation and obtains clean coal, medium coal, and gangue.
  • the Bohou sieve the sieve size is 50mm
  • the screening size is 50mm
  • the screened material of the grading sieve (grading particle size is 3mm) is fed into a three-product heavy medium cyclone for separation, and the obtained clean coal, medium coal, and gangue products are respectively subjected to de-medium magnetic separation, and further qualified Clean coal, medium coal, gangue and media, among which qualified medium coal is returned to the roller compactor for crushing;

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  • Combined Means For Separation Of Solids (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

一种适用于难选动力煤的分选工艺，包括A、大于50mm干法分选，中煤破碎再选作业；B、13-50mm湿法分选，中煤破碎后再选作业；C、3-13mm湿法分选，中煤破碎再选作业；D、1-3mm湿法分选，0-1mm压滤煤泥作业。

Description

一种难选动力煤分选工艺 技术领域
本发明涉及动力煤的分选工艺，尤其是一种适用于中煤破碎再选的难选动力煤的分选工艺。
背景技术
随着我国煤炭开采工业的现代化发展、煤炭开采量的持续增加、煤炭消费需求的进一步加大以及市场对动力煤产品质量要求的逐步提高，难选动力煤的比例大幅度增加，其煤质较差、原煤中矸石泥化程度严重、细泥含量高、可选性较差，常规的动力煤分选工艺已不能满足市场对动力煤产品的要求，而且动力煤的市场价格低，分选的盈利性较差，这严重制约着选煤厂对动力煤分选工艺的综合选择，因此必须根据动力煤的煤质特点设计出低成本的难选动力煤分选工艺，从而尽可能地提高动力煤分选的吨煤利润。对于难选动力煤的分选工艺来说，应最大程度地回收精煤产品，尽可能地保证精煤的回收率，从而减少精煤的损失，这也是解决难选动力煤低成本分选工艺设计难题的关键因素。
常规的动力煤分选工艺，如：干法分选工艺，整个分选过程不加水，但是该工艺分选精度低，只能去除原煤中约80％的矸石量，而且对-6mm粒级的动力煤分选精度极差，因而这部分动力煤通常不参与分选，直接用做产品或是做掺和处理，因而该工艺降灰幅度低，精煤质量不高，一般只适用于易选、中等可选或较难选的煤炭分选，对于难选或者极难选的动力煤来说，分选效果差；跳汰排矸工艺，采用水介质而不是重介质作为分选介质，虽然成本较重介质分选工艺低但是分选精度不高，因而不适用于难选和极难选煤；全级重介质分选工艺，分选精度高、对原煤质量的适用能力强，但是该工艺加剧了物料与重介悬浮液之间的接触和对流，会增加系统内的次生煤泥量，从而间接提高洗选成本；块煤重介质排矸末煤不入选的分选工艺比全级重介质分选工艺的吨煤加工成本低，适用于分选块煤含量大、末煤灰分不高的动力煤，但是由于末煤不入选，这在很大程度上造成了精煤资源的浪费，间接地降低了吨煤利润。因此，设计一种适用于难选动力煤的低成本分选工艺已成为动力煤资源高效洁净利用过程中亟待解决的一个难题。
发明内容
技术问题：本发明目的是克服已有工艺中的不足之处，并充分结合煤质特点，尤其是煤泥量和泥化程度、用户对产品质量的要求，以所有产品的综合经济效益最大化为出发点，合里确定入洗粒度以及洗选设备，提供一种低成本、工艺合理、投资少、分选效率高、经济效益显著的难选动力煤分选工艺。
技术方案：为实现上述技术目的，本发明的难选动力煤分选工艺，其步骤为：
首先利用博后筛将原煤中粒径大于50mm的部分进行干法分选获得精煤、中煤和矸石，中煤重新给入博后筛继续分选，使用气流分级机Ⅰ对粒径小于50mm的部分进行筛分，筛分分选出粒径在13-50mm的产物和粒径小于13mm的产物，将粒径在13-50mm的产物给入重 介质浅槽分选机湿法分选得到精煤、中煤和矸石并回收合格介质，其中中煤流先给入辊式碾压机破碎后给入分级筛筛分，将粒径小于13mm的产物给入气流分级机Ⅱ分选，获得粒径在3-13mm的产物和粒径小于3mm的产物，分级筛筛分得到粒径大于3mm的产物和粒径小于3mm的产物，其中粒径大于3mm的产物与气流分级机Ⅱ分选的粒径在3-13mm的产物一起给入三产品重介质旋流器分选从而获得精煤、中煤和矸石并回收合格介质，其中中煤继续给入辊式碾压机破碎，分级筛筛分的粒径小于3mm的产物与气流分级机Ⅱ分选后粒径小于3mm的产物一起给入脱泥筛筛分，筛分分选出筛上产物和筛下产物，将筛上产物给入螺旋分选机分选从而得到精煤、中煤和矸石，将筛下产物给入压滤机脱水得到煤泥。
具体步骤为：
a、将原煤给入博后筛进行预先筛分，筛分后获得粒径大于50mm的筛上物和粒径小于50mm的筛下物，将筛上物给入智能干选机分选并得到精煤、矸石和中煤物料，并将中煤物料给入冲击破碎机破碎后返回到博后筛再选；
b、将博后筛筛分后获得的粒径小于50mm的产物给入气流分级机Ⅰ从而获得粒径在13-50mm的产物和粒径小于13mm的产物，对粒径在3-13mm的产物进行13-50mm湿法分选，即将粒径在13-50mm的产物给入重介质浅槽分选机分选，利用精煤弧形筛筛分获得精煤、合格介质与稀介质，并使用磁选机从稀介质中回收合格介质跟磁尾，利用中煤弧形筛获得中煤、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，利用矸石弧形筛获得矸石、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾；
c、将中煤弧形筛获得的中煤利用辊式碾压机破碎后给入分级筛分级，获得粒径大于3mm的产物和粒径小于3mm的产物，利用气流分级机Ⅰ获得的粒径小于13mm的产物，给入气流分级机Ⅱ获得粒径在3-13mm的产物与粒径小于3mm的产物，
将分级筛筛分出的粒径大于3mm的产物和气流分级机Ⅱ获得的粒径在3-13mm的产物一起给入三产品重介质旋流器分选，利用精煤弧形筛分选出精煤、合格介质和稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，利用中煤弧形筛获得中煤、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，中煤重新给入辊式碾压机破碎给入分级筛，利用矸石弧形筛获得矸石、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾；
d、分级筛筛分后的粒径小于3mm的产物和气流分级机Ⅱ获得的粒径小于3mm的产物一起给入分级粒度为1mm的脱泥筛分选，粒度大于1mm的产物给入螺旋了分选机分选获得精煤、中煤和矸石，粒度小于1mm的产物给入压滤机获得煤泥。
所述脱介设备采用弧形筛。
有益效果：
通过原煤干法分级后粗颗粒干法分选、中细颗粒湿法分选，中煤破碎再选，粗颗粒(+50mm)智能干选机分选、中颗粒(13-50mm)重介质浅槽分选、细颗粒(1-3mm)三产品重介旋流器分选的工艺，以此获取低成本、高回收率的动力煤精煤产品。首次应用原煤预先筛分后干法分选、干法分级后按粒级湿法分选、中煤破碎后再选的工艺来实现难选动力煤低成本分选，不仅解决了泥化程度对分选过程的影响，而且解决了分选精度和产品回收率之间的矛盾。
其主要优点包括：
a、原煤采用干法分级，分级设备包括博后筛和气流分级机，以保证分选之前煤不遇水，最大程度上降低泥化程度、减少次生煤泥量的产生，解决了泥化程度对分选过程的影响；
b、结合难选动力煤的煤质特点，对中煤破碎后再选，以尽可能多地回收精煤，提高精煤产品的回收率，从而保证动力煤资源利用最大化；
c、根据煤的粒级不同，采用不同的分选方式，粗颗粒(+50mm)智能干选机分选、中颗粒(13-50mm)重介质浅槽分选、细颗粒(1-3mm)三产品重介旋流器分选，在保证分选精度最高的同时，兼顾分选成本最低化。
d、该工艺流程合理、投资少、成本低，同传统的分选工艺相比分选效率高、精煤回收率高、经济效益显著。
附图说明
图1是本发明中分选工艺流程图。
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，本发明的难选动力煤分选工艺，其步骤为：
包括A、大于50mm刚发分选，中煤破碎再选作业；B、13-50mm湿法分选，中煤破碎后再选作业；C、3-13mm湿法分选，中煤破碎再选作业；D、1-3mm湿法分选，0-1mm压滤煤泥作业；
首先利用博后筛将原煤中粒径大于50mm的部分进行干法分选获得精煤、中煤和矸石，中煤重新给入博后筛继续分选，使用气流分级机Ⅰ对粒径小于50mm的部分进行筛分，筛分分选出粒径在13-50mm的产物和粒径小于13mm的产物，将粒径在13-50mm的产物给入重介质浅槽分选机湿法分选得到精煤、中煤和矸石并回收合格介质，其中中煤流先给入辊式碾压机破碎后给入分级筛筛分，将粒径小于13mm的产物给入气流分级机Ⅱ分选，获得粒径在3-13mm的产物和粒径小于3mm的产物，分级筛筛分得到粒径大于3mm的产物和粒径小于3mm的产物，其中粒径大于3mm的产物与气流分级机Ⅱ分选的粒径在3-13mm的产物一起 给入三产品重介质旋流器分选从而获得精煤、中煤和矸石并回收合格介质，其中中煤继续给入辊式碾压机破碎，分级筛筛分的粒径小于3mm的产物与气流分级机Ⅱ分选后粒径小于3mm的产物一起给入脱泥筛筛分，筛分分选出筛上产物和筛下产物，将筛上产物给入螺旋分选机分选从而得到精煤、中煤和矸石，将筛下产物给入压滤机脱水得到煤泥。
具体步骤为：
a、将原煤给入博后筛进行预先筛分，筛分后获得粒径大于50mm的筛上物和粒径小于50mm的筛下物，将筛上物给入智能干选机分选并得到精煤、矸石和中煤物料，并将中煤物料给入冲击破碎机破碎后返回到博后筛再选；
b、将博后筛筛分后获得的粒径小于50mm的产物给入气流分级机Ⅰ从而获得粒径在13-50mm的产物和粒径小于13mm的产物，对粒径在3-13mm的产物进行13-50mm湿法分选，即将粒径在13-50mm的产物给入重介质浅槽分选机分选，利用精煤弧形筛筛分获得精煤、合格介质与稀介质，并使用磁选机从稀介质中回收合格介质跟磁尾，利用中煤弧形筛获得中煤、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，利用矸石弧形筛获得矸石、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾；
c、将中煤弧形筛获得的中煤利用辊式碾压机破碎后给入分级筛分级，获得粒径大于3mm的产物和粒径小于3mm的产物，利用气流分级机Ⅰ获得的粒径小于13mm的产物，给入气流分级机Ⅱ获得粒径在3-13mm的产物与粒径小于3mm的产物，
将分级筛筛分出的粒径大于3mm的产物和气流分级机Ⅱ获得的粒径在3-13mm的产物一起给入三产品重介质旋流器分选，利用精煤弧形筛分选出精煤、合格介质和稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，利用中煤弧形筛获得中煤、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，中煤重新给入辊式碾压机破碎给入分级筛，利用矸石弧形筛获得矸石、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾；
d、分级筛筛分后的粒径小于3mm的产物和气流分级机Ⅱ获得的粒径小于3mm的产物一起给入分级粒度为1mm的脱泥筛分选，粒度大于1mm的产物给入螺旋了分选机分选获得精煤、中煤和矸石，粒度小于1mm的产物给入压滤机获得煤泥。
脱介设备采用弧形筛。
具体实施例一：
本发明的难选动力煤分选工艺包括采用博后筛、智能干选机、冲击式破碎机、气流分级机、重介质浅槽分选机、脱介筛、磁选机、碾压破碎机、重介质旋流器、脱泥筛、螺旋分选机和压滤机。具体实施步骤如下：
(1)入选的原煤经过博后筛(筛分粒级为50mm)预先筛分，筛分后的筛上物(+50mm) 进入智能干选机分选并得到精煤、中煤、矸石三种产品，其中的中煤产品全部给入冲击式破碎级进行破碎，并返回到博后筛(筛分粒级为50mm)进行筛分再选；
(2)预先筛分的筛下物(-50mm)给入气流分级机(分级粒度为13mm)分级，气流分级机(分级粒度为13mm)的溢流细颗粒物料进入小直径气流分级机(分级粒度为3mm)再次分级，气流分级机(分级粒度为13mm)底流粗颗粒物料给入到重介质浅槽分选机进行分选并将得到的精煤、中煤、矸石产品分别进行脱介磁选，进一步得到合格的精煤、中煤、矸石以及介质，其中合格中煤全部给入辊式碾压机进行破碎，并全部通过分级筛(分级粒度为3mm)进行分级；
(3)分级筛(分级粒度为3mm)的筛上物给入三产品重介质旋流器进行分选并将得到的精煤、中煤、矸石产品分别进行脱介磁选，进一步得到合格的精煤、中煤、矸石以及介质，其中合格中煤全部返回到辊式碾压机进行破碎；
(4)分级筛(分级粒度为3mm)的筛下物与小直径气流分级机(分级粒度为3mm)的溢流一起进入脱泥筛(分级粒度为1mm)再次分级，并将脱泥筛(分级粒度为1mm)的筛上物给入到螺旋分选机进行分选并得到精煤、中煤、矸石产品，脱泥筛(分级粒度为1mm)的筛下物给入压滤机脱水后得到煤泥产品。

Claims (3)

  1. 一种难选动力煤分选工艺，其特征在于步骤为：
    首先利用博后筛将原煤中粒径大于50mm的部分进行干法分选获得精煤、中煤和矸石，中煤重新给入博后筛继续分选，使用气流分级机Ⅰ对粒径小于50mm的部分进行筛分，筛分分选出粒径在13-50mm的产物和粒径小于13mm的产物，将粒径在13-50mm的产物给入重介质浅槽分选机湿法分选得到精煤、中煤和矸石并回收合格介质，其中中煤流先给入辊式碾压机破碎后给入分级筛筛分，将粒径小于13mm的产物给入气流分级机Ⅱ分选，获得粒径在3-13mm的产物和粒径小于3mm的产物，分级筛筛分得到粒径大于3mm的产物和粒径小于3mm的产物，其中粒径大于3mm的产物与气流分级机Ⅱ分选的粒径在3-13mm的产物一起给入三产品重介质旋流器分选从而获得精煤、中煤和矸石并回收合格介质，其中中煤继续给入辊式碾压机破碎，分级筛筛分的粒径小于3mm的产物与气流分级机Ⅱ分选后粒径小于3mm的产物一起给入脱泥筛筛分，筛分分选出筛上产物和筛下产物，将筛上产物给入螺旋分选机分选从而得到精煤、中煤和矸石，将筛下产物给入压滤机脱水得到煤泥。
  2. 根据权利要求1所述的难选动力煤分选工艺，其特征在于具体步骤为：
    a、将原煤给入博后筛进行预先筛分，筛分后获得粒径大于50mm的筛上物和粒径小于50mm的筛下物，将筛上物给入智能干选机分选并得到精煤、矸石和中煤物料，并将中煤物料给入冲击破碎机破碎后返回到博后筛再选；
    b、将博后筛筛分后获得的粒径小于50mm的产物给入气流分级机Ⅰ从而获得粒径在13-50mm的产物和粒径小于13mm的产物，对粒径在3-13mm的产物进行13-50mm湿法分选，即将粒径在13-50mm的产物给入重介质浅槽分选机分选，利用精煤弧形筛筛分获得精煤、合格介质与稀介质，并使用磁选机从稀介质中回收合格介质跟磁尾，利用中煤弧形筛获得中煤、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，利用矸石弧形筛获得矸石、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾；
    c、将中煤弧形筛获得的中煤利用辊式碾压机破碎后给入分级筛分级，获得粒径大于3mm的产物和粒径小于3mm的产物，利用气流分级机Ⅰ获得的粒径小于13mm的产物，给入气流分级机Ⅱ获得粒径在3-13mm的产物与粒径小于3mm的产物，
    将分级筛筛分出的粒径大于3mm的产物和气流分级机Ⅱ获得的粒径在3-13mm的产物一起给入三产品重介质旋流器分选，利用精煤弧形筛分选出精煤、合格介质和稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，利用中煤弧形筛获得中煤、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾，中煤重新给入辊式碾压机破碎给入分级筛，利用矸石弧形筛获得矸石、合格介质与稀介质并使用磁选机从稀介质中回收合格介质跟磁尾；
    d、分级筛筛分后的粒径小于3mm的产物和气流分级机Ⅱ获得的粒径小于3mm的产物一起给入分级粒度为1mm的脱泥筛分选，粒度大于1mm的产物给入螺旋了分选机分选获得精煤、中煤和矸石，粒度小于1mm的产物给入压滤机获得煤泥。
  3. 根据权利要求2所述的难选动力煤分选工艺，其特征在于：所述脱介设备采用弧形筛。
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