CN102896036B - Three-section four-product heavy media coal preparation process - Google Patents
Three-section four-product heavy media coal preparation process Download PDFInfo
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- CN102896036B CN102896036B CN201210357029.6A CN201210357029A CN102896036B CN 102896036 B CN102896036 B CN 102896036B CN 201210357029 A CN201210357029 A CN 201210357029A CN 102896036 B CN102896036 B CN 102896036B
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Abstract
The invention discloses a three-section four-product heavy media coal preparation process. A buffering tank is additionally arranged at the tail of a second section of a two-section heavy media coal preparation system, and a third-section whirlcone is additionally arranged behind the buffering tank. Qualified clean coal is firstly separated out under the rotational flow effect of suspension liquid after raw coal enters a first section of the whirlcone, and the rest of materials enter the second section of the whirlcone. Middle coal is separated out in the second section of the whirlcone, and then the rest of materials enter a third section of the whirlcone through the buffering tank. Electricity coal is separated out in the third section of the whirlcone, and then residual gangue with low calorific value is discharged through a bottom flowing port of the third section of the whirlcone. By means of the three-section four-product heavy media coal preparation process, the qualified clean coal and the middle coal in the traditional process can be obtained, the electricity coal with about 60% of ash content can be obtained, the ash content in the wasted gangue is improved to more than 80%, the calorific value is reduced below 800cal, and coal resources are saved maximumly.
Description
Technical field
The invention belongs to the coal preparation technology field.
Background technology
No matter traditional coal preparation technique is the jigging method or heavily is situated between method, except coal slime, two sections three products heavy-media coal preparation process flow processs of general employing, reelecting the Recognition Applied in Coal Preparation System that coal technique takes is two sections three products dense-medium separations, the cyclone of two sections three products dense-medium separations only has two sections, only produce three kinds of products: cleaned coal, middle coal and spoil.Cleans ash is in 10% left and right, midale coal ash 40% left and right, spoil ash content 70%.The caloric value of spoil is greatly about 2000 kilocalories of/kilogram left and right, and such spoil is for generating electricity burning, and caloric value is a bit on the low side; If for the raw material of construction material, also contain 30% flammable body product, can't directly utilize.In order rationally to utilize limited coal resources, should, by the further sorting of this part spoil, divide the spoil of electing electric product of coal (caloric value is 3000 kilocalories/kilogram) as and can directly utilizing processing building materials low carbon content.
Summary of the invention
The objective of the invention is, on the basis of existing two sections three products heavy-media coal preparation process flow processs, to invent a kind of process the spoil of by the method, spoil being selected to the electric product of coal that caloric value is relatively high and can directly utilizing the low carbon content of processing building materials.
The present invention provides a kind of three sections four-product dense-medium separation systems that are applicable to this coal preparation technique simultaneously
For achieving the above object, the technical scheme that coal preparation technique of the present invention is taked is,
The first step: three sections four-product dense-medium separation systems of model
Three sections four-product dense-medium separation system architectures are: the cyclone second segment afterbody in existing two sections three products dense-medium separation systems increases a baffle-box, the baffle-box back increases by one section cyclone again, be called the 3rd section of cyclone, feeding density in the 3rd section cyclone is 1.7g/cm
3the heavy-media suspension of left and right, feed pressure and be not less than 0.1MPa.
Second step: utilize three sections four-product dense-medium separation systems that establish to carry out coal separation, concrete method for separating is as follows:
(1) at first raw coal sub-elects qualified cleaned coal after entering the cyclone first paragraph under the cyclonic action of suspension, and leftover materials enter the cyclone second segment;
(2) sub-elect middle coal at the cyclone second segment, after second segment sub-elects middle coal, remaining material enters the 3rd section of cyclone through baffle-box again:
(3) sub-elect electric coal the 3rd section of cyclone, remaining lower calorific value spoil is discharged by the underflow opening of the 3rd section of cyclone.
The invention has the advantages that: by four-product heavy-media coal preparation process flow process, not only can obtain qualified cleaned coal and middle coal in traditional handicraft, can also obtain the electric coal of ash content in 60% left and right.This part electric calorific value of coal, 3000 kilocalories of/kilogram left and right, can generate electricity for Gangue Power Plant, and output is about 15% of spoil output in legacy system.Also make in addition the ash content of discarded spoil bring up to more than 80%, caloric value drops to below 800cal, not only saves to greatest extent coal resources, and the spoil of lower calorific value also is more prone in follow-up comprehensive utilization.
The accompanying drawing explanation
1-3 further illustrates three sections four-product heavy-media coal preparation process methods of the present invention with reference to the accompanying drawings.
Fig. 1 is process chart of the present invention;
Fig. 2 is pressurized feeding system image contact figure of the present invention;
Fig. 3 is unpressurized feeding system image contact figure of the present invention.
In figure: 1-cyclone first paragraph, 2-cyclone second segment, the 3rd section of 3-cyclone, 4-baffle-box
XF represents suspension, and YM represents raw coal, coal in the ZM representative, and JM represents cleaned coal, and GS represents spoil, and DM represents electric coal, and XFYM represents the mixture of suspension and raw coal
The specific embodiment:
From Fig. 2,3, find out, three sections dense-medium separation systems of the present invention comprise two sections cyclones, be respectively cyclone first paragraph 1 and cyclone second segment 2, increased a baffle-box 4 at cyclone second segment 2 afterbodys, baffle-box 4 back increase the 3rd section 3 of cyclone again, and feeding density in the 3rd section 3 of cyclone is 1.7g/cm
3the heavy-media suspension XF of left and right, feed pressure and be not less than 0.1MPa.
As can be seen from Figure 1, sorting process of the present invention is: at first raw coal YM sub-elects qualified cleaned coal JM after entering cyclone first paragraph 1 under the cyclonic action of suspension XF, leftover materials enter cyclone second segment 2 and sub-elect middle coal ZM, and remaining material enters the 3rd section 3 of cyclone by baffle-box 4 again; Sub-elect electric coal DM for the 3rd section 3 at cyclone, remaining lower calorific value spoil GS is discharged by the underflow opening of the 3rd section 3 of cyclone.
Fig. 2 and Fig. 3 are respectively pressurized feeding system image contact figure of the present invention and unpressurized feeding system image contact figure; As can be seen from the figure, the difference of pressurized feeding system and unpressurized feeding system is enter material way, wherein the pressurized feeding system is that raw coal YM and suspension XF enter cyclone first paragraph 1 at different entrances, and the unpressurized feeding system to be raw coal YM and suspension XF mix forms raw coal slurry compositions XFYM and enter cyclone first paragraph 1.
Claims (1)
1. three sections four-product heavy-media coal preparation processes, is characterized in that, sorting process is as follows:
The first step: three sections four-product dense-medium separation systems of model
Three sections four-product dense-medium separation system architectures are: the cyclone second segment afterbody two sections three products dense-medium separation systems increases a baffle-box, the baffle-box back increases by one section cyclone again, be called the 3rd section of cyclone, feeding density in the 3rd section of cyclone is 1.7g/cm
3the heavy-media suspension of left and right, feed pressure and be not less than 0.1MPa;
Second step: utilize three sections four-product dense-medium separation systems that establish to carry out coal separation, concrete method for separating is as follows:
(1) at first raw coal sub-elects qualified cleaned coal after entering the cyclone first paragraph under the cyclonic action of suspension, and leftover materials enter the cyclone second segment;
(2) sub-elect middle coal at the cyclone second segment, after second segment sub-elects middle coal, remaining material enters the 3rd section of cyclone through baffle-box again:
(3) sub-elect electric coal the 3rd section of cyclone, remaining lower calorific value spoil is discharged by the underflow opening of the 3rd section of cyclone.
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CN104624408B (en) * | 2015-03-02 | 2017-04-19 | 云南磷化集团有限公司 | Method for producing powdery phosphate concentrate by two-segment hydrocyclone open circuit flow |
CN111841864A (en) * | 2020-06-29 | 2020-10-30 | 临沂矿业集团菏泽煤电有限公司 | Linear flow distribution box of coal slime dense medium coal separation system of coal washery |
CN113019671B (en) * | 2021-03-19 | 2023-04-07 | 神华神东煤炭集团有限责任公司 | Screening method and screening system for medium in full-dense coal separation process |
CN116550481A (en) * | 2023-07-11 | 2023-08-08 | 天津美腾科技股份有限公司 | Three-section dense medium cyclone for recycling and re-selecting |
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CN1418734A (en) * | 2002-12-26 | 2003-05-21 | 天地科技股份有限公司唐山分公司 | Heavy medium vortrap, coal separation system and method therefor |
CN101530824A (en) * | 2009-04-14 | 2009-09-16 | 金易通科技(北京)有限公司 | A coal dressing method and system of four-product jigging primary cleaning, secondary head coal small simplified heavy medium reelecting |
CN201565351U (en) * | 2009-12-03 | 2010-09-01 | 廖寅飞 | Medium separation box for heavy medium coal separation plant |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1418734A (en) * | 2002-12-26 | 2003-05-21 | 天地科技股份有限公司唐山分公司 | Heavy medium vortrap, coal separation system and method therefor |
CN101530824A (en) * | 2009-04-14 | 2009-09-16 | 金易通科技(北京)有限公司 | A coal dressing method and system of four-product jigging primary cleaning, secondary head coal small simplified heavy medium reelecting |
CN201565351U (en) * | 2009-12-03 | 2010-09-01 | 廖寅飞 | Medium separation box for heavy medium coal separation plant |
Non-Patent Citations (2)
Title |
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《无压给料重介质旋流器选煤技术的开发与发展》;李秀丽;《选煤技术》;19970825(第4期);第3-6页 * |
李秀丽.《无压给料重介质旋流器选煤技术的开发与发展》.《选煤技术》.1997,(第4期), |
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