CN102824955B - Method for using refined coal magnetic separator tailings for flotation water-spraying foam removal - Google Patents
Method for using refined coal magnetic separator tailings for flotation water-spraying foam removal Download PDFInfo
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- CN102824955B CN102824955B CN 201210336787 CN201210336787A CN102824955B CN 102824955 B CN102824955 B CN 102824955B CN 201210336787 CN201210336787 CN 201210336787 CN 201210336787 A CN201210336787 A CN 201210336787A CN 102824955 B CN102824955 B CN 102824955B
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Abstract
The invention discloses a method for using refined-coal magnetic separator tailings for flotation water-spraying foam removal. The method provides an improvement method aiming at characteristic of first-section overflowing refined coal products of a three-product heavy-medium cyclone, which comprises the following steps of: separating, removing the medium, recycling the medium, and using the refined-coal magnetic separator tailings for the flotation water-spraying foam removal. Therefore, the method is suitable for the characteristic of the refined-coal magnetic separator tailings of the first-section overflowing refined coal products of the three-product heavy-medium cyclone, and is particularly suitable for the technical reform of the refined-coal magnetic separator tailings in a coal preparation plant in which the content of fine granular materials (-0.5mm) is high.
Description
Technical field
The present invention relates to a kind of coal preparation technique method, relate to a kind of cleaned coal magnetic tail specifically as flotation water spray debubbling method.
Background technology
China is maximum in the world coal production state and country of consumption, the coal reserves is 9915.60 hundred million t, account for 70% in the primary energy production and consumption constitutes, wherein 84% coal directly burns as thermal coal, and this energy resource structure based on coal can not change in quite over a long time from now on.As maximum in the world developing country, China's sustained and rapid development of economy over nearly 20 years increases sharply to demand and the consumption of the energy, and is also more and more outstanding by the caused environmental problem of coal utilization.The progressively raising of Environmental Protection in China rules and standard thereof, following Energy Mix will tilt to clean energy resourcies such as natural gas, water power, nuclear energy lentamente, but in foreseeable future, turning variation can not take place in the ratio of coal in China's energy-consuming constitutes.China is a large amount of to produce and consumes coal and the environmental problem that caused, causes the Chinese government and the people's great attention and the concern of surrounding countries.In order effectively to utilize coal resources, to reduce coal-fired pollution to environment, guarantee the sustainable development of national economy health, must carry out clean coal technology.Clean coal technology is is the source with the coal washing, turn to the guide, be the technical system of core with coal clean combustion and generating with coal conversion.The coal washing technology is the most ripe in the clean coal technology, the most reliable, and investment and operating cost are minimum.Can remove spoil in the raw coal by coal washing, reduce sulphur content and ash content in the coal, improve the quality of coal and increase the kind of coal commodity, for effectively utilizing coal, reducing pollution that caused by coal burning and create conditions.
Flotation obtains general application as the method for Bed for Fine Coal sorting in coal preparation plant, is mainly used in the following Bed for Fine Coal of sorting 0.5mm.
Magnetic separator mine tailing (hereinafter to be referred as magnetic tail) refers to the last black water after magnetic iron ore is reclaimed in the magnetic separator magnetic separation in coal preparation plant; Cleaned coal magnetic separator mine tailing (hereinafter to be referred as the cleaned coal magnetic tail) then refers to for the screenings of selected cleaned coal behind sculping screen that heavily be situated between, and is sent to magnetic separator and reclaims magnetic iron ore black water afterwards.
Coal separation one factory of Shanxi sunlight coking Group Co.,Ltd then is to make it be sent to cleaned coal magnetic tail bucket earlier for the cleaned coal magnetic tail, with pump cleaned coal magnetic tail bucket is driven in the classifying cyclone then, the overflow of cyclone is sent to flotation device flotation again, and concrete process chart as shown in Figure 1.
The a application number of announcing in 2007 is in the application for a patent for invention " two stage dewatering technology of fine coal mud " of 200610102141.X, then be to sieve by vibration sieve bend earlier for the cleaned coal magnetic tail, screenings is sent to flotation device and selects, oversize is sent to screen-bowl centrifuge and further handles, and process chart as shown in Figure 2.
Wang Zhuan ore deposit coal preparation plant of the Lushui River peace group 2009 is finished by the reorganization and expansion of Tai Gete group, and its coal preparation technique that adopts is: 200～40mm adopts the dense-medium shallow-tank branch; 40～1.0mm adopts two section two product dual medium cyclone dressing; 1.0～0.25mm coarse slime adopts the sorting of TSS slime separation machine; 0.25～0 mm fine coal slurry adopts the flotation device sorting.Wherein the cleaned coal magnetic tail of dense-medium shallow-tank separator has been used as the water spray of raw coal sizing screen (40mm sieve aperture), and the cleaned coal magnetic tail of heavy medium cyclone has been used as the water spray of last raw coal desliming screen (1mm sieve aperture).
In the above-described cleaned coal magnetic tail treatment process, Shanxi Co., Ltd of sunlight coking group adopts classifying cyclone that the cleaned coal magnetic tail has been carried out classification, and the flotation device that is sent to that granularity is little carries out flotation recovery Bed for Fine Coal wherein; Number of patent application be in the patent of invention of 200610102141.X for the cleaned coal magnetic tail, it is sent in the vibration sieve bend, screenings is sent to flotation device to carry out flotation and reclaims; What the Lushui River was pacified coal washery, group Wang Zhuan ore deposit then is the water spray that directly the cleaned coal magnetic tail is used as sieve, has replaced the effect of recirculated water.
At the cleaned coal magnetic tail treatment process that is generally used, have following characteristics: 1. the cleaned coal magnetic tail is sent to earlier in the cleaned coal magnetic tail bucket at present, and a big cleaned coal magnetic tail Stall that bucket is positioned at has taken bigger space, and the capital expenditure cost is also very big; 2. with the cleaned coal magnetic tail through after the grading plant, fine-gradedly send into flotation and select system to carry out sorting, increased the load of flotation device; 3. the froth breaking water spray of flotation device use needs to use recirculated water, has further increased the load of follow-up black water dewatering process.
Summary of the invention
A kind of cleaned coal magnetic tail of cleaned coal magnetic tail utilization ratio, minimizing flotation device power consumption and reduction capital expenditure cost that improves that purpose of the present invention provides at existing weak point in the above-mentioned prior art just is as the flotation debubbling method.
Method proposed by the invention can reduce the investment of system and the capital expenditure of factory building, has improved the reliability of floatation system, reduces system consumption power, streamlining management and maintenance work.
The present invention is directed to the characteristics of one section overflow head coal product of three products heavy medium cyclone, a kind of cleaned coal magnetic tail has been proposed as flotation froth breaking water spray means, namely traditional cleaned coal magnetic tail treatment process is improved, make the characteristics of cleaned coal magnetic tail of one section overflow head coal product of its suitable three products heavy medium cyclone, (0.5mm) the extra high coal preparation plant of content is to the technological transformation of its cleaned coal magnetic tail particularly to be fit to fine.
Purpose of the present invention can realize by following technique measures:
Processing step of the present invention is as follows:
A. lump coal raw material ⑴ is sent into and carries out sorting in the three products heavy medium cyclone, obtain cleaned coal ⑵, middle coal ⑶ and spoil ⑷ respectively, the middle coal ⑶ that obtains and spoil ⑷ are carried out de-mediated and dehydration link after, coal bunker and waste bin in sending into respectively;
B. will send into the arc sculping screen from the cleaned coal ⑵ among the step a and carry out a de-mediated, screenings is sent into qualified medium bucket ⑹ as qualified medium; Oversize ⑸ sends into the straight-line oscillation sculping screen and carries out the secondary de-mediated, and the preceding 1/3 section screenings of linear vibrating screen is sent into qualified medium bucket ⑹ as qualified medium; The screenings that is provided with behind the linear vibrating screen of water injector 2/3 section is sent into magnetic separator (owing to added water spray back 2/3 section of linear vibrating screen as rare medium ⑻, qualified medium is diluted, obtained rare medium, the operation that this step adds water belongs to the routine operation of de-mediated system), oversize piece cleaned coal ⑺ sends into the cleaned coal storehouse after through the centrifugal dehydrator dehydration;
C. to being sent to magnetic separator from the rare medium ⑻ among the step b through after the magnetic separation, the concentrate that magnetic separation obtains is sent to current divider box and shunts (routine operation that the current divider box triage operator belongs to the magnetic separation system), reduces fine slime content wherein; The cleaned coal magnetic tail ⑼ that magnetic separation obtains is sent to floatation system;
D. the Bed for Fine Coal pan feeding ⑽ of general-0.5mm is sent to and carries out flotation in the flotation device, will be from the water spray of the cleaned coal magnetic tail ⑼ among the step c as flotation device, in order to prevent because mixing in the cleaned coal stream foam being arranged, so the form of employing water spray is carried out froth breaking, in order to avoid influence follow-up conveying and dewatering operation; Cleaned coal ⑾ that flotation obtains is sent to the cleaned coal storehouse through processed, tail coal ⑿ through concentrating-press filtration (this step concentrate-press filtration belong to the routine operation that floating tail-coal is handled) becomes coal slime and is sent to the tail coal storehouse.
In above-mentioned processing step was described, processing steps such as the not moisturizing of Miao Shuing, de-mediated, interpolation magnetic iron ore and interpolation clear water all were the routine techniques of this system, do not repeat them here.
Useful result of the present invention is as follows:
1. the present invention utilizes three products heavy medium cyclone to the grading of overflow product, no longer needs the follow-up grading to the cleaned coal magnetic tail.
2. the present invention directly sprays water the cleaned coal magnetic tail as the flotation froth breaking, the cleaned coal magnetic tail is owing to passed through the sorting of three products heavy medium cyclone, guaranteed that fine-graded coal is qualified head coal product in the cleaned coal magnetic tail, finally passing through dehydration by the overflow of flotation device becomes cleaned coal.
The present invention utilize magnetic separator to rare section magnetic iron ore that is situated between up to 99.999% the rate of recovery, guaranteed in the cleaned coal magnetic tail, to exist the magnetite powder of minute quantity; When this cleaned coal magnetic tail is used as the froth breaking water of agitation impeller flotator, because the density of magnetic iron ore is big than Bed for Fine Coal density, these a spot of magnetite powders can become the underflow of flotation device, and can not be sent to the pollution load of overflow floatation clean coal product of flotation device, have guaranteed the quality of floatation clean coal.
4. the present invention has played cleaning action by flotation device froth breaking water spray, has reduced carrying secretly of thin mud, has lowered the ash content of head coal product.
5. the present invention has reduced cleaned coal magnetic tail tube and follow-up cleaned coal magnetic tail graded operation, has reduced capital expenditure, is beneficial to maintenance.
6. the present invention replaces recirculated water as flotation device froth breaking water spray the cleaned coal magnetic tail, has reduced the load of follow-up black water processing operation.
Description of drawings
Fig. 1 is the processing mode process chart of the cleaned coal magnetic tail of Shanxi sunlight coking coal separation one factory.
Fig. 2 is that application number is the treating method process chart of the disclosed cleaned coal magnetic tail of 200610102141.X.
Fig. 3 is a whole set of process chart of the present invention.
Fig. 4 is that the cleaned coal magnetic tail that technology of the present invention relates to is used as the process chart that the flotation froth breaking is sprayed water.
The specific embodiment
The present invention does further detailed description below with reference to embodiment (accompanying drawing 4) to the present invention.
As shown in Figure 4, cleaned coal magnetic tail of the present invention is that characteristics at one section overflow head coal product of three products heavy medium cyclone have proposed a kind of improving one's methods as flotation water spray debubbling method, be sorting-de-mediated-medium recovery-cleaned coal magnetic tail as flotation froth breaking water spray link (referring to Fig. 4), make the characteristics of cleaned coal magnetic tail of one section overflow head coal product of its suitable three products heavy medium cyclone, (0.5mm) the extra high coal preparation plant of content is to the technological transformation of its cleaned coal magnetic tail particularly to be fit to fine.
Technology of the present invention is undertaken by following step:
A. lump coal pan feeding ⑴ is sent to and carries out sorting in the three products heavy medium cyclone, obtains cleaned coal ⑵, middle coal ⑶ and spoil ⑷ respectively, behind the middle coal ⑶ and spoil ⑷ process de-mediated and dehydration link that obtain, and coal bunker and waste bin in being sent to respectively;
B. carry out a de-mediated to being sent to the arc sculping screen from the cleaned coal ⑵ among the step a, screenings is sent to qualified medium bucket ⑹ as qualified medium; Oversize ⑸ is sent to the straight-line oscillation sculping screen and carries out the secondary de-mediated, and the preceding 1/3 section screenings of linear vibrating screen is sent to qualified medium bucket ⑹ as qualified medium; Behind the linear vibrating screen 2/3 section screenings as rare medium ⑻ (owing to added water spray back 2/3 section of linear vibrating screen, qualified medium is diluted, obtained rare medium, the operation that this step adds water belongs to the routine operation of de-mediated system) be sent to magnetic separator, oversize piece cleaned coal ⑺ sends into the cleaned coal storehouse after through the centrifugal dehydrator dehydration;
C. to being sent to magnetic separator from the rare medium ⑻ among the step b through after the magnetic separation, the concentrate that magnetic separation obtains is sent to current divider box and shunts, and reduces fine slime content (the current divider box triage operator belongs to the routine operation of magnetic separation system) wherein; The mine tailing that magnetic separation obtains (cleaned coal magnetic tail ⑼) is sent to floatation system;
D. the Bed for Fine Coal pan feeding ⑽ of general-0.5mm is sent to and carries out flotation in the flotation device, will carry out froth breaking with the form of water spray from the water spray of the cleaned coal magnetic tail ⑼ among the step c as flotation device, prevents from influencing follow-up operation because cleaned coal is mingled with a large amount of foams; Cleaned coal ⑾ that flotation obtains is sent to the cleaned coal storehouse through processed, tail coal ⑿ through concentrating-press filtration (this step concentrate-press filtration belong to the routine operation that floating tail-coal is handled) becomes coal slime and is sent to the tail coal storehouse.
In above-mentioned processing step was described, processing steps such as the not moisturizing of Miao Shuing, de-mediated, interpolation magnetic iron ore and interpolation clear water all were the routine techniques of this system, do not repeat them here.
Claims (1)
1. one kind is used for the method for flotation water spray froth breaking with the cleaned coal magnetic tail, and it is characterized in that: the processing step of described method is as follows:
A. lump coal raw material ⑴ is sent into and carries out sorting in the three products heavy medium cyclone, obtain cleaned coal ⑵, middle coal ⑶ and spoil ⑷ respectively, the middle coal ⑶ that obtains and spoil ⑷ are carried out de-mediated and dehydration link after, coal bunker and waste bin in sending into respectively;
B. will send into the arc sculping screen from the cleaned coal ⑵ among the step a and carry out a de-mediated, screenings is sent into qualified medium bucket ⑹ as qualified medium; Oversize ⑸ sends into the straight-line oscillation sculping screen and carries out the secondary de-mediated, and the preceding 1/3 section screenings of linear vibrating screen is sent into qualified medium bucket ⑹ as qualified medium; Back 2/3 section of linear vibrating screen is provided with water injector, and this screenings of 2/3 section is sent into magnetic separator as rare medium ⑻, and oversize piece cleaned coal ⑺ sends into the cleaned coal storehouse after dewatering through centrifugal dehydrator;
C. to being sent to magnetic separator from the rare medium ⑻ among the step b through after the magnetic separation, the concentrate that magnetic separation obtains is sent to current divider box and shunts, and reduces fine slime content wherein; The cleaned coal magnetic tail ⑼ that magnetic separation obtains is sent to floatation system;
D. the Bed for Fine Coal pan feeding ⑽ of general-0.5mm is sent to and carries out flotation in the flotation device, will be from the water spray of the cleaned coal magnetic tail ⑼ among the step c as flotation device, in order to prevent because mixing in the cleaned coal stream foam being arranged, so the form of employing water spray is carried out froth breaking, in order to avoid influence follow-up conveying and dewatering operation; The cleaned coal ⑾ that flotation obtains is sent to the cleaned coal storehouse through processed, and tail coal ⑿ becomes coal slime and is sent to the tail coal storehouse through concentrated-press filtration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210336787 CN102824955B (en) | 2012-09-13 | 2012-09-13 | Method for using refined coal magnetic separator tailings for flotation water-spraying foam removal |
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| CN 201210336787 CN102824955B (en) | 2012-09-13 | 2012-09-13 | Method for using refined coal magnetic separator tailings for flotation water-spraying foam removal |
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| CN105170306B (en) * | 2014-03-10 | 2017-12-05 | 衢州市易凡设计有限公司 | A kind of washing process for the high high high spoil coal of mud of ash |
| CN105233973B (en) * | 2015-11-02 | 2017-11-24 | 迈安德集团有限公司 | The graded desliming system and desliming process of a kind of MICA |
| CN108097451A (en) * | 2018-01-27 | 2018-06-01 | 华北科技学院 | A kind of coal separation station-service magnetic separation process flow |
| CN109201314B (en) * | 2018-09-11 | 2020-12-01 | 乌拉特中旗毅腾矿业有限责任公司 | Clean utilization production process for middlings |
| CN112221210B (en) * | 2019-12-13 | 2022-04-19 | 安徽理工大学 | Multi-stage sedimentation rake-free concentration device capable of distributing materials uniformly |
| CN110935203B (en) * | 2019-12-13 | 2020-10-20 | 安徽理工大学 | Rake-free concentration device comprising driving area |
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Patent Citations (4)
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| GB666801A (en) * | 1948-08-20 | 1952-02-20 | Stamicarbon | Process for the separation of mixtures of solid materials of different specific gravity and different grain size |
| US4802976A (en) * | 1988-01-04 | 1989-02-07 | Miller Francis G | Method for recovering fine clean coal |
| CN1792830A (en) * | 2005-10-21 | 2006-06-28 | 赵树彦 | Tech. for treating coal mud water by tow section concentration, tow section recovery |
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