CN109746114B - Separation process of refractory power coal - Google Patents
Separation process of refractory power coal Download PDFInfo
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Abstract
A separation process suitable for refractory power coal belongs to a coal separation method. Comprises A, sorting the fresh coal with a diameter of more than 50mm, crushing the middlings and then sorting the middlings; B. wet separation of 13-50mm, crushing the middlings and then performing separation operation; C. wet separation of 3-13mm, crushing and re-separation of middlings; D. wet separation of 1-3mm, and filter pressing of coal slurry of 0-1 mm. The raw coal is classified by a dry method, and the classification equipment comprises a Bo-Back sieve and an airflow classifier so as to ensure that the coal does not contact water before being classified, reduce the argillization degree, reduce the generation of secondary coal slime and solve the influence of the argillization degree on the classification process; the clean coal is recovered, and the recovery rate of clean coal products is improved, so that the maximum utilization of power coal resources is ensured; according to different coal size grades, different separation modes are adopted, and the intelligent coarse particle dry separator is used for separation, the medium particle heavy medium shallow slot separation and the fine particle heavy medium cyclone separation are used for separation, so that the highest separation precision is ensured, and the lowest separation cost is also considered.
Description
Technical Field
The invention relates to a separation process of power coal, in particular to a separation process of hard-to-separate power coal suitable for crushing and re-separating middlings.
Background
With the modern development of the coal mining industry in China, the continuous increase of the coal mining quantity, the further increase of the coal consumption demand and the gradual improvement of the quality requirement of the market on power coal products, the proportion of refractory power coal is greatly increased, the coal quality is poor, the argillization degree of gangue in raw coal is serious, the content of fine mud is high, the selectivity is poor, the conventional power coal sorting process cannot meet the requirement of the market on the power coal products, the market price of the power coal is low, and the sorting profitability is poor, so that the comprehensive selection of the power coal sorting process by a coal preparation plant is severely restricted, and therefore, the low-cost refractory power coal sorting process must be designed according to the characteristics of the coal quality of the power coal, and the profit per ton of power coal sorting is improved as much as possible. For the separation process of the refractory power coal, the clean coal product is recovered to the maximum extent, and the recovery rate of the clean coal is ensured as much as possible, so that the loss of the clean coal is reduced, and the key factor for solving the design problem of the low-cost separation process of the refractory power coal is also solved.
Conventional power coal separation processes, such as: the dry separation process has no water added in the whole separation process, but the separation precision of the process is low, only about 80 percent of gangue in raw coal can be removed, and the separation precision of the power coal with the particle size of-6 mm is extremely poor, so that the power coal usually does not participate in separation and is directly used as a product or subjected to blending treatment, therefore, the ash reduction amplitude of the process is low, the quality of clean coal is not high, the process is generally only suitable for separation of coal which is easy to select, medium to select or difficult to select, and the separation effect is poor for the power coal which is difficult to select or extremely difficult to select; the jigging gangue-discharging process adopts a water medium instead of a dense medium as a separation medium, and although the separation process has lower cost than the dense medium, the separation precision is not high, so that the jigging gangue-discharging process is not suitable for coal which is difficult to separate and extremely difficult to separate; the full-grade dense medium separation process has high separation precision and strong applicability to the quality of raw coal, but the process aggravates the contact and convection between materials and dense medium suspension liquid, increases the amount of secondary coal slime in a system, and indirectly improves the washing cost; the non-selection separation process for the lump coal dense medium gangue-discharging slack coal has lower processing cost per ton than the full-grade dense medium separation process, is suitable for separating the power coal with high lump coal content and low ash content of the slack coal, but the non-selection of the slack coal causes the waste of clean coal resources to a great extent, and indirectly reduces the profit per ton coal. Therefore, designing a low-cost separation process suitable for refractory power coal becomes a difficult problem to be solved in the process of efficient and clean utilization of power coal resources.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art, fully combines the characteristics of coal quality, particularly the coal slime amount, the argillization degree and the requirements of users on the product quality, takes the comprehensive economic benefit of all products as the starting point, determines the washing granularity and washing equipment in combination, and provides the separation process of the refractory power coal, which has the advantages of low cost, reasonable process, less investment, high separation efficiency and remarkable economic benefit.
The technical scheme is as follows: in order to realize the technical purpose, the invention discloses a separation process of refractory power coal, which comprises the following steps:
firstly, performing dry separation on a part with the particle size larger than 50mm in raw coal by using a secondary sieve to obtain clean coal, middlings and gangue, feeding the middlings into the secondary sieve again for continuous separation, screening the part with the particle size smaller than 50mm by using an airflow classifier I, screening and separating the products with the particle size of 13-50mm and the products with the particle size smaller than 13mm, feeding the products with the particle size of 13-50mm into a dense medium shallow slot separator for wet separation to obtain the clean coal, the middlings and the gangue and recycling qualified media, wherein the middlings flow is fed into a roller mill firstly to be crushed and then fed into a classifying sieve for screening, the products with the particle size smaller than 13mm are fed into an airflow classifier II for separation, and the products with the particle size of 3-13mm and the products with the particle size smaller than 3mm are obtained, the products with the particle size larger than 3mm and the products with the particle size smaller than 3mm are screened by the classifying sieve, wherein the products with the particle size larger than 3mm and the cyclone products with the particle size of 3-13mm which are And (3) separating by using a separator to obtain clean coal, middlings and waste rocks and recycling qualified media, wherein the middlings are continuously fed into a roller type rolling machine for crushing, products with the particle size smaller than 3mm screened by a classifying screen and products with the particle size smaller than 3mm screened by an airflow classifier II are fed into a desliming screen for screening, oversize products and undersize products are screened and separated, the oversize products are fed into a spiral separator for separation to obtain clean coal, middlings and waste rocks, and the undersize products are fed into a filter press for dewatering to obtain coal slime.
The method comprises the following specific steps:
a. feeding raw coal into a post-blasting sieve for pre-screening to obtain oversize products with the particle size larger than 50mm and undersize products with the particle size smaller than 50mm, feeding the oversize products into an intelligent dry separator for separation to obtain clean coal, gangue and medium coal materials, feeding the medium coal materials into an impact crusher for crushing, and returning the crushed medium coal materials to the post-blasting sieve for re-screening;
b. feeding a product with the particle size of less than 50mm obtained after screening by a post-sieving machine into an airflow classifier I so as to obtain a product with the particle size of 13-50mm and a product with the particle size of less than 13mm, carrying out 13-50mm wet separation on the product with the particle size of 3-13mm, namely feeding the product with the particle size of 13-50mm into a heavy medium shallow slot separator for separation, obtaining clean coal, qualified medium and dilute medium by screening by a clean coal arc sieve, recovering the qualified medium and magnetic tail from the dilute medium by using a magnetic separator, obtaining medium coal, qualified medium and dilute medium by the medium coal arc sieve, recovering the qualified medium and magnetic tail from the dilute medium by using the magnetic separator, and obtaining gangue, qualified medium and dilute medium by a gangue arc sieve and recovering the qualified medium and magnetic tail from the dilute medium by using the magnetic separator;
c. crushing middlings obtained by a middling sieve bend by using a roller type roller mill, feeding the middlings into a grading sieve for grading to obtain products with the particle size of more than 3mm and products with the particle size of less than 3mm, feeding the middlings into an airflow classifier II to obtain products with the particle size of 3-13mm and products with the particle size of less than 3mm by using products with the particle size of less than 13mm obtained by an airflow classifier I,
feeding a product with the particle size of more than 3mm screened by the classifying screen and a product with the particle size of 3-13mm obtained by the airflow classifier II into a three-product heavy medium cyclone for sorting, screening clean coal, qualified medium and dilute medium by using the clean coal arc screen, recovering the qualified medium and the magnetic tail from the dilute medium by using a magnetic separator, obtaining middling coal, the qualified medium and the dilute medium by using the middling coal arc screen, recovering the qualified medium and the magnetic tail from the dilute medium by using the magnetic separator, feeding the middling coal into a roller type roller mill again for crushing and feeding into the classifying screen, obtaining gangue, the qualified medium and the dilute medium by using the gangue arc screen, and recovering the qualified medium and the magnetic tail from the dilute medium by using the magnetic separator;
d. and feeding the product with the particle size smaller than 3mm after being screened by the grading screen and the product with the particle size smaller than 3mm obtained by the airflow grader II into a desliming screen with the grading particle size of 1mm for separation, feeding the product with the particle size larger than 1mm into a spiral separator for separation to obtain clean coal, middlings and gangue, and feeding the product with the particle size smaller than 1mm into a filter press to obtain coal slime.
The medium removing equipment adopts a curved screen.
Has the advantages that:
the process comprises the steps of dry separation of coarse particles, wet separation of medium and fine particles, crushing and re-separation of medium coal, separation of coarse particles (+50mm) by an intelligent dry separator, separation of medium particles (13-50mm) by a heavy medium shallow groove and separation of fine particles (1-3mm) by a heavy medium cyclone, so that the power coal clean coal product with low cost and high recovery rate is obtained. The method is characterized in that the method comprises the steps of dry separation after pre-screening raw coal, wet separation according to the size fraction after dry classification and recleaning after crushing medium coal, so that the separation of the hard-to-separate power coal with low cost is realized, the influence of the argillization degree on the separation process is solved, and the contradiction between the separation precision and the product recovery rate is solved.
Its main advantages include:
a. the raw coal is classified by a dry method, and the classification equipment comprises a Bo-Back sieve and an airflow classifier so as to ensure that the coal does not contact water before being sorted, reduce the argillization degree to the maximum extent, reduce the generation of secondary coal slime and solve the influence of the argillization degree on the sorting process;
b. the coal quality characteristics of the refractory power coal are combined, the middlings are crushed and then separated, so that the clean coal is recovered as much as possible, the recovery rate of clean coal products is improved, and the utilization maximization of power coal resources is ensured;
c. according to different coal size grades, different sorting modes are adopted, and the sorting method comprises the steps of sorting coarse particles (+50mm) by an intelligent dry sorting machine, sorting medium particles (13-50mm) by heavy medium shallow grooves and sorting fine particles (1-3mm) by a heavy medium cyclone, so that the highest sorting precision is ensured, and the lowest sorting cost is considered.
d. The process has the advantages of reasonable flow, less investment, low cost, high separation efficiency, high clean coal recovery rate and obvious economic benefit compared with the traditional separation process.
Drawings
FIG. 1 is a flow diagram of a sorting process according to the present invention.
Detailed Description
The invention will be further described in the following with reference to the accompanying drawings:
as shown in figure 1, the separation process of the refractory power coal comprises the following steps:
comprises A, sorting the fresh coal with a diameter of more than 50mm, crushing the middlings and then sorting the middlings; B. wet separation of 13-50mm, crushing the middlings and then performing separation operation; C. wet separation of 3-13mm, crushing and re-separation of middlings; D. wet separation of 1-3mm, and coal slime press filtration of 0-1 mm;
firstly, performing dry separation on a part with the particle size larger than 50mm in raw coal by using a secondary sieve to obtain clean coal, middlings and gangue, feeding the middlings into the secondary sieve again for continuous separation, screening the part with the particle size smaller than 50mm by using an airflow classifier I, screening and separating the products with the particle size of 13-50mm and the products with the particle size smaller than 13mm, feeding the products with the particle size of 13-50mm into a dense medium shallow slot separator for wet separation to obtain the clean coal, the middlings and the gangue and recycling qualified media, wherein the middlings flow is fed into a roller mill firstly to be crushed and then fed into a classifying sieve for screening, the products with the particle size smaller than 13mm are fed into an airflow classifier II for separation, and the products with the particle size of 3-13mm and the products with the particle size smaller than 3mm are obtained, the products with the particle size larger than 3mm and the products with the particle size smaller than 3mm are screened by the classifying sieve, wherein the products with the particle size larger than 3mm and the cyclone products with the particle size of 3-13mm which are And (3) separating by using a separator to obtain clean coal, middlings and waste rocks and recycling qualified media, wherein the middlings are continuously fed into a roller type rolling machine for crushing, products with the particle size smaller than 3mm screened by a classifying screen and products with the particle size smaller than 3mm screened by an airflow classifier II are fed into a desliming screen for screening, oversize products and undersize products are screened and separated, the oversize products are fed into a spiral separator for separation to obtain clean coal, middlings and waste rocks, and the undersize products are fed into a filter press for dewatering to obtain coal slime.
The method comprises the following specific steps:
a. feeding raw coal into a post-blasting sieve for pre-screening to obtain oversize products with the particle size larger than 50mm and undersize products with the particle size smaller than 50mm, feeding the oversize products into an intelligent dry separator for separation to obtain clean coal, gangue and medium coal materials, feeding the medium coal materials into an impact crusher for crushing, and returning the crushed medium coal materials to the post-blasting sieve for re-screening;
b. feeding a product with the particle size of less than 50mm obtained after screening by a post-sieving machine into an airflow classifier I so as to obtain a product with the particle size of 13-50mm and a product with the particle size of less than 13mm, carrying out 13-50mm wet separation on the product with the particle size of 3-13mm, namely feeding the product with the particle size of 13-50mm into a heavy medium shallow slot separator for separation, obtaining clean coal, qualified medium and dilute medium by screening by a clean coal arc sieve, recovering the qualified medium and magnetic tail from the dilute medium by using a magnetic separator, obtaining medium coal, qualified medium and dilute medium by the medium coal arc sieve, recovering the qualified medium and magnetic tail from the dilute medium by using the magnetic separator, and obtaining gangue, qualified medium and dilute medium by a gangue arc sieve and recovering the qualified medium and magnetic tail from the dilute medium by using the magnetic separator;
c. crushing middlings obtained by a middling sieve bend by using a roller type roller mill, feeding the middlings into a grading sieve for grading to obtain products with the particle size of more than 3mm and products with the particle size of less than 3mm, feeding the middlings into an airflow classifier II to obtain products with the particle size of 3-13mm and products with the particle size of less than 3mm by using products with the particle size of less than 13mm obtained by an airflow classifier I,
feeding a product with the particle size of more than 3mm screened by the classifying screen and a product with the particle size of 3-13mm obtained by the airflow classifier II into a three-product heavy medium cyclone for sorting, screening clean coal, qualified medium and dilute medium by using the clean coal arc screen, recovering the qualified medium and the magnetic tail from the dilute medium by using a magnetic separator, obtaining middling coal, the qualified medium and the dilute medium by using the middling coal arc screen, recovering the qualified medium and the magnetic tail from the dilute medium by using the magnetic separator, feeding the middling coal into a roller type roller mill again for crushing and feeding into the classifying screen, obtaining gangue, the qualified medium and the dilute medium by using the gangue arc screen, and recovering the qualified medium and the magnetic tail from the dilute medium by using the magnetic separator;
d. and feeding the product with the particle size smaller than 3mm after being screened by the grading screen and the product with the particle size smaller than 3mm obtained by the airflow grader II into a desliming screen with the grading particle size of 1mm for separation, feeding the product with the particle size larger than 1mm into a spiral separator for separation to obtain clean coal, middlings and gangue, and feeding the product with the particle size smaller than 1mm into a filter press to obtain coal slime.
The medium removing equipment adopts a sieve bend.
The first embodiment is as follows:
the invention discloses a separation process of refractory power coal, which comprises a Bo-Bach screen, an intelligent dry separator, an impact crusher, an air classifier, a heavy medium shallow slot separator, a medium removing screen, a magnetic separator, a rolling crusher, a heavy medium cyclone, a mud removing screen, a spiral separator and a filter press. The specific implementation steps are as follows:
(1) pre-screening the selected raw coal by a post-screening sieve (the screening size fraction is 50mm), feeding the screened oversize product (+50mm) into an intelligent dry separator for separation to obtain three products of clean coal, middlings and gangue, wherein all the middlings are fed into an impact type crushing stage for crushing, and returned to the post-screening sieve (the screening size fraction is 50mm) for screening and re-selecting;
(2) feeding minus sieve (-50mm) sieved in advance into an airflow classifier (with the classification particle size of 13mm) for classification, feeding overflow fine particle materials of the airflow classifier (with the classification particle size of 13mm) into a small-diameter airflow classifier (with the classification particle size of 3mm) for secondary classification, feeding underflow coarse particle materials of the airflow classifier (with the classification particle size of 13mm) into a heavy medium shallow slot classifier for separation, and respectively performing medium removal magnetic separation on the obtained clean coal, middlings and gangue products to further obtain qualified clean coal, middlings, gangue and media, wherein all the qualified middlings are fed into a roller mill for crushing, and are all classified through a classification sieve (with the classification particle size of 3 mm);
(3) feeding oversize materials of a grading sieve (the grading particle size is 3mm) into a three-product dense medium cyclone for sorting, and respectively performing medium removal magnetic separation on the obtained clean coal, middlings and gangue products to further obtain qualified clean coal, middlings, gangue and medium, wherein all the qualified middlings are returned to a roller type roller mill for crushing;
(4) undersize materials of a classifying screen (with the classifying granularity of 3mm) and overflow of a small-diameter airflow classifier (with the classifying granularity of 3mm) enter a desliming screen (with the classifying granularity of 1mm) for secondary classification, oversize materials of the desliming screen (with the classifying granularity of 1mm) are fed into a spiral separator for separation, cleaned coal, middlings and gangue products are obtained, undersize materials of the desliming screen (with the classifying granularity of 1mm) are fed into a filter press for dehydration, and then coal slime products are obtained.
Claims (1)
1. A separation process of refractory power coal is characterized by comprising the following steps:
firstly, performing dry separation on a part with the particle size larger than 50mm in raw coal by using a secondary sieve to obtain clean coal, middlings and gangue, feeding the middlings into the secondary sieve again for continuous separation, screening the part with the particle size smaller than 50mm by using an airflow classifier I, screening and separating the products with the particle size of 13-50mm and the products with the particle size smaller than 13mm, feeding the products with the particle size of 13-50mm into a dense medium shallow slot separator for wet separation to obtain the clean coal, the middlings and the gangue and recycling qualified media, wherein the middlings flow is fed into a roller mill firstly to be crushed and then fed into a classifying sieve for screening, the products with the particle size smaller than 13mm are fed into an airflow classifier II for separation, and the products with the particle size of 3-13mm and the products with the particle size smaller than 3mm are obtained, the products with the particle size larger than 3mm and the products with the particle size smaller than 3mm are screened by the classifying sieve, wherein the products with the particle size larger than 3mm and the cyclone products with the particle size of 3-13mm which are Separating by a separator to obtain clean coal, middlings and waste rocks and recycling qualified media, wherein the middlings are continuously fed into a roller type rolling machine for crushing, products with the particle size smaller than 3mm screened by a classifying screen and products with the particle size smaller than 3mm screened by an airflow classifier II are fed into a desliming screen for screening, oversize products and undersize products are screened and separated, the oversize products are fed into a spiral separator for separation to obtain clean coal, middlings and waste rocks, and the undersize products are fed into a filter press for dewatering to obtain coal slime;
the method comprises the following specific steps:
a. feeding raw coal into a post-blasting sieve for pre-screening to obtain oversize products with the particle size larger than 50mm and undersize products with the particle size smaller than 50mm, feeding the oversize products into an intelligent dry separator for separation to obtain clean coal, gangue and medium coal materials, feeding the medium coal materials into an impact crusher for crushing, and returning the crushed medium coal materials to the post-blasting sieve for re-screening;
b. feeding a product with the particle size of less than 50mm obtained after screening by a post-sieving machine into an airflow classifier I so as to obtain a product with the particle size of 13-50mm and a product with the particle size of less than 13mm, carrying out 13-50mm wet separation on the product with the particle size of 3-13mm, namely feeding the product with the particle size of 13-50mm into a heavy medium shallow slot separator for separation, obtaining clean coal, qualified medium and dilute medium by screening by a clean coal arc sieve, recovering the qualified medium and magnetic tail from the dilute medium by using a magnetic separator, obtaining medium coal, qualified medium and dilute medium by the medium coal arc sieve, recovering the qualified medium and magnetic tail from the dilute medium by using the magnetic separator, and obtaining gangue, qualified medium and dilute medium by a gangue arc sieve and recovering the qualified medium and magnetic tail from the dilute medium by using the magnetic separator;
c. crushing middlings obtained by a middling sieve bend by using a roller type roller mill, feeding the middlings into a grading sieve for grading to obtain products with the particle size of more than 3mm and products with the particle size of less than 3mm, feeding the middlings into an airflow classifier II to obtain products with the particle size of 3-13mm and products with the particle size of less than 3mm by using products with the particle size of less than 13mm obtained by an airflow classifier I,
feeding a product with the particle size of more than 3mm screened by the classifying screen and a product with the particle size of 3-13mm obtained by the airflow classifier II into a three-product heavy medium cyclone for sorting, screening clean coal, qualified medium and dilute medium by using the clean coal arc screen, recovering the qualified medium and the magnetic tail from the dilute medium by using a magnetic separator, obtaining middling coal, the qualified medium and the dilute medium by using the middling coal arc screen, recovering the qualified medium and the magnetic tail from the dilute medium by using the magnetic separator, feeding the middling coal into a roller type roller mill again for crushing and feeding into the classifying screen, obtaining gangue, the qualified medium and the dilute medium by using the gangue arc screen, and recovering the qualified medium and the magnetic tail from the dilute medium by using the magnetic separator;
d. products with the particle size smaller than 3mm after being screened by the grading screen and products with the particle size smaller than 3mm obtained by the airflow grader II are fed into a desliming screen with the grading particle size of 1mm for separation, products with the particle size larger than 1mm are fed into a spiral separator for separation to obtain clean coal, middlings and gangue, and products with the particle size smaller than 1mm are fed into a filter press to obtain coal slime;
the medium removing equipment adopts a sieve bend;
the raw coal is classified by a dry method, and the classification equipment comprises a Bo-Back sieve and an airflow classifier so as to ensure that the coal does not contact water before being sorted, reduce the argillization degree to the maximum extent, reduce the generation of secondary coal slime and solve the influence of the argillization degree on the sorting process;
the coal quality characteristics of the refractory power coal are combined, the middlings are crushed and then separated, so that the clean coal is recovered as much as possible, the recovery rate of clean coal products is improved, and the maximum utilization of power coal resources is guaranteed.
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| CN110449259B (en) * | 2019-08-20 | 2021-10-08 | 神华神东煤炭集团有限责任公司 | Desliming equipment and desliming process |
| CN111744661A (en) * | 2020-07-23 | 2020-10-09 | 中国矿业大学 | Coal sorting-coal blending cooperative upgrading process method |
| CN112474300A (en) * | 2020-12-08 | 2021-03-12 | 国家能源集团宁夏煤业有限责任公司 | Dry coal sorting method |
| CN112871441A (en) * | 2020-12-29 | 2021-06-01 | 安徽理工大学 | Non-quantitative washing method for low-quality coal slime |
| CN113145292B (en) * | 2021-04-19 | 2023-02-28 | 国能包头能源有限责任公司 | Grading and selecting method for multistage screening and powder removal of power coal |
| CN113941431A (en) * | 2021-10-08 | 2022-01-18 | 神华准格尔能源有限责任公司 | Method and system for 3mm deep separation of power coal |
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| CN102179291A (en) * | 2010-12-31 | 2011-09-14 | 中国神华能源股份有限公司 | Steam coal preparation technique with low coal slime yield |
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| CN104174481A (en) * | 2014-08-27 | 2014-12-03 | 中国矿业大学(北京) | Simplified shallow-slot dense medium coal separation method |
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