CN104722390A - Coking middling coal dms-flotation combined separation process - Google Patents
Coking middling coal dms-flotation combined separation process Download PDFInfo
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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
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Abstract
The invention discloses a coking middling coal dms-flotation combined separation process, and belongs to the technical field of coking middling coal separation. The process comprises the steps of 1, primary size mixing flotation operation, 2, hierarchical dewatering operation, 3, crushing and screening operation, 4, coarse slime separation operation, 5, desliming operation, 6, ore grinding dissociation operation, 7, secondary size mixing operation and 8, secondary flotation operation. The coking middling coal dms-flotation combined separation process is simple in procedure, small in investment, low in energy consumption, little in operation cost, high in separation efficiency and remarkable in economic benefit.
Description
Technical field
The present invention relates to coal sorting technology field in coking, particularly relate to a kind of heavily floating combined sorting technique being applicable to coal in the more coking of middle intergrowth content.
Background technology
Along with the fast development of China's economy, the demand of coking coal is growing.Although rich coal resources in China, have strategic coking resource and only account for 27.6% of reserves, and about 46.9% be wherein bottle coal, coking coal and rich coal only account for 5.39%, 3.38% of gross reserves.The coking coal that China enters to wash every year and rich coal clean coal yield are 40%, and middle coal productive rate is on average more than 30%, and in this part, coal as thermal coal, can only which results in the significant wastage of scarce resource and the massive losses of economic benefit because ash content is high.In coking, coal is ash content between the intermediate product of cleaned coal and spoil, and its basic characteristics are that ash content is high, but still containing higher flammable body burden, because coal and spoil are fully dissociated, cannot obtain up-to-standard head coal product by direct sorting.Dissociating to the fragmentation of coal in coking is the prerequisite realizing sorting, but excessively pulverizing not only can cause the waste of energy, also can cause adverse effect to sorting.Realize coal in coking dissociate and efficient separation not only have good economic results in society, to guarantee national energy security also have positive role.Because coal and spoil exist comparatively notable difference in crushing strength, in coking, the fragmentation solution defection of coal makes the cleaned coal content in particulate get more and more, and in coarse grain, be mainly the thin middle coal intergrowth of disseminated grain size and spoil grey with height, a large amount of cleaned coal cannot be obtained by gravity treatment.Coal slime after dissociating mainly relies on flotation to realize effective sorting, and floatation process the most common be exactly that tail coal runs thick with height ash carefully sludge-polluted problem.It is due to classifying cyclone limited efficacy on the one hand that tail coal runs thick, enter floating Task-size Controlling not good caused by, and be exactly that the thin cement content of the high ash competitive Adsorption of crossing multipair medicament exacerbates and runs thick on the other hand, also make cleaned coal seriously polluted.The thin mud amount of high ash is not only relevant with ature of coal, and the excessive pulverizing of middle coal intergrowth is also particularly the major reason that the thin mud amount of high ash is large to the invalid broken mill of high ash particle.Therefore for jet coal in coking seriously polluted with race the thick and problem of depositing; a kind of thin mud amount of height ash effectively reducing brokenly mill and produce is proposed, improve simultaneously the coarse grain rate of recovery and fine particle separation optionally in coking coal sorting process be of great importance to promoting that the secondary recovery of scarce resource utilizes.
Summary of the invention
The present invention be intended to provide a kind of can the effective sorting process of coal in sorting coking, coal in flotation (tail coal coarse grain) is reclaimed low grey coarse grain wherein by gravity treatment, in gravity treatment, coal differently reclaims according to granularity after selective crushing, simultaneously according to coal coal slime in fragmentation and coal slime size difference in grinding process intensification particulate of sizing mixing at bis flotation time the coarse grain rate of recovery and particulate selective, with solve floating tail-coal run thick and middle coal excessive Grin-ding energ7 too high while thin mud carry serious problem secretly, provide a kind of operating cost low, the efficiency of separation is high, coal method for separating in the significant coking of business efficiency.
The present invention adopts following technical scheme:
In coking of the present invention, the heavily floating combined sorting technique of coal is as follows:
A, separation of coarse slime operation: one section of floating tail-coal coarse grain is fed in one section of separation of coarse slime machine the low ash particle used in gravity treatment recovery flotation in coal-tail coal coarse grain, effectively can solve the thick problem of race because classifying equipoment efficiency difference exceeds the flotation upper limit or occurs because flotation effect difference; After utilizing two sections of separation of coarse slime machines to carry out throwing tail the non-low grey coarse grain in the coarse slime after coal fragmentation in gravity treatment and one section of floating tail-coal, ore grinding dissociates, avoid energy charge that the ore grinding of the grey coarse grain of height is brought and the adverse effect to flotation, reduce the thin mud amount of high ash;
B, two sections of flotation operations of sizing mixing: the different requirements from middle coal ore grinding fine coal slurry, energy of sizing mixing inputted according to the broken coal slime of middle coal; when sizing mixing respectively by guarantee, the m-time of sizing mixing is not less than 4min and intensity-agitator arm linear velocity of sizing mixing is not less than 6m/s and realizes the abundant absorption of coarse grain and medicament and effective absorption of particulate and medicament; thus increase the flotation coarse grain rate of recovery and particulate selective; in after sizing mixing, the broken coal slime of coal feeds floatation equipment sorting after mixing with middle coal ore grinding coal slime, simplifies sorting flow process.
In coking of the present invention, the concrete grammar of the heavily floating combined sorting technique of coal is as follows:
(1) one section of flotation operation of sizing mixing:
To enter float coal mud ore pulp to flow automatically to be given in flotation device/post after agitator is sized mixing and carry out sorting, obtain one section of floatation clean coal and one section of floating tail-coal, floatation clean coal enters follow-up dehydration link becomes final products, and tail coal ore pulp enters subsequent hierarchical dewatering operation;
(2) Dewatering operation:
Be pumped to classifying cyclone after one section of flotation device floating tail-coal enters tail coal pond buffering and carry out classification, classifying cyclone underflow enters the further desliming dehydration of desliming oscillating screen, the overflow of classifying cyclone is as floating tail-coal together with desliming screen backwater, and in desliming screen oversize-flotation, coal enters the sorting of separation of coarse slime machine;
(3) crushing and screening operation:
In gravity treatment, coal enters impact breaker and carries out selective crushing and dissociate, broken rear material enters classifying screen and carries out classification, wherein+2mm coarse grain turns back to slack coal separation system and selects, and 2-0.5mm feeds spiral and carries out sorting, and the broken coal slime of-0.5mm enters bis flotation operation;
(4) separation of coarse slime operation:
This Partial Jobs comprises two sections of sortings, coal in tail coal coarse grain-flotation in one section of separation of coarse slime machine sorting, one section of flotation operation, coarse coal slurry and heavy product can be obtained after sorting, two sections of spiral sortings, one section of 2-0.5mm coarse slime weighed in product and gravity treatment after coal fragmentation, flotation again after light product ore grinding after throwing tail dissociates, two sections heavy products are coarse grain spoil;
(5) desliming operation:
Two sections of spiral light products enter sieve bend and carry out desliming dehydration, and oversize enters grinding machine and dissociates, and sieve bend screenings enters follow-up separation operation of sizing mixing together with double-deck classifying screen-0.5mm material;
(6) ore grinding dissociates operation:
Oversize in step (5) after dehydration desliming-thick middle coal slime enters grinding in coal pulverizer and dissociates, mill speed can adjust (working speed is the 65%-85% of critical speed) according to pan feeding character and granularity of dissociating, to ensure that-0.074mm part accounts for 40-50%, the middle colliery stock pump after dissociating is delivered to middle coal size mixing equipment and is sized mixing;
(7) two sections of operations of sizing mixing:
The broken coal slime of the sieve bend screenings obtained in step (5) and double-deck classifying screen-0.5mm material-middle coal enters single hop impeller and to size mixing agitator, and the time of sizing mixing is not less than 4min to ensure that collecting agent and coal grain fully adsorb; Obtain in step (6) dissociate after middle colliery slurry-ore grinding fine coal slurry enter in multistage action of forced stirring size mixing equipment, agitator arm linear velocity is not less than 6m/s;
(8) bis flotation operation:
The broken coal slime of middle coal and middle coal ore grinding coal slime enter in bis flotation equipment after sizing mixing carries out sorting, the bis flotation cleaned coal obtained and two sections of tail coals, one section of floatation clean coal is as final floatation clean coal together with bis flotation cleaned coal, and two sections of tail coals are as floating tail-coal.
In step (3), in described gravity treatment, coal comprises coal in coal in block, end.
In step (7), when the broken coal slime of middle coal and middle coal ore grinding coal slime carry out sizing mixing operation, add diesel oil or kerosene as flotation collector, consumption is 100-300g/t.Ensure that into floating pulp density be 60-80g/L by adding the water yield.
Good effect of the present invention is as follows:
The present invention is the sorting process dissociated based on middle coal ore grinding, by realizing sorting material and screening installation characteristic adaptation improves its efficiency of separation.Reclaim a floating tail-coal coarse grain, the race avoiding low grey coarse grain is thick; The efficient separation realizing each grade is reclaimed by point grade after coal selective crushing in gravity treatment; Spiral is thrown tail and is decreased unnecessary broken mill; The process of sizing mixing of the broken coal slime of coal and middle coal ore grinding coal slime in strengthening, ensure its rate of recovery and selective respectively by mating of the time of sizing mixing and intensity of sizing mixing, first Application heavily floats the efficient separation that combined sorting technique realizes coal in coking.
Major advantage has:
A, to reclaim in gravity treatment respectively according to different grain size after coal fragmentation, + 2mm material utilizes the field of force sorting of dense medium eddy flow, 2-0.5mm separation of coarse slime equipment sorting,-0.5mm flotation is reclaimed, avoid the drawback of the wide grade material of single coal preparation method sorting, adopt selective good impact breaker to avoid overcrushing to high rigidity spoil, saved crushing energy and expended.
B, low grey coarse grain is wherein reclaimed in coal utilization gravity treatment in flotation, efficiently solve the thick problem of race because classifying equipoment efficiency difference exceeds the flotation upper limit or occurs because of flotation effect difference, after utilizing separation of coarse slime machine to carry out throwing tail the coarse slime after dissociating and the coarse grain in one section of floating tail-coal, ore grinding dissociates, avoid energy charge that the ore grinding of the grey coarse grain of height is brought and the adverse effect to flotation, reduce the thin mud amount of high ash.
C, the different requirements that are that input energy of sizing mixing for the broken coal slime of middle coal and the different of middle coal ore grinding slime size, mate with different stirring size mixing equipments.Coarse grain ore pulp feeds single hop impeller and to size mixing agitator, fully ensures to size mixing the time (time of sizing mixing is not less than 4min) to guarantee the abundant absorption of flotation collector at particle surface; Particulate ore pulp feeds in multistage action of forced stirring size mixing equipment, this equipment is provided with three layers of agitator arm and speed of agitator high (agitator arm linear velocity is not less than 6m/s), particulate ore pulp and flotation collector are fully disperseed in size mixing equipment, realizes effective absorption of fine slime and collecting agent.Improve medicament quality of adsorption by the strengthening of the process of sizing mixing, increase the rate of recovery of coarse grain and the selective of particulate.
D, this technology investment are less, and power consumption is little, and operating cost is low, and the efficiency of separation is high, remarkable in economical benefits.
Accompanying drawing explanation
Fig. 1 is sorting process FB(flow block) of the present invention.
Fig. 2 is the installation drawing of the heavily floating combined sorting technique of coal in coking of the present invention.
In figure: A mono-section of floatation feed is sized mixing agitator, B mono-section of flotation device, C tail coal Buffer Pool, D classification pan feeding pump, E classifying cyclone, high F is sieve frequently, G separation of coarse slime machine, H impact breaker, I classifying screen, J spiral, K sieve bend, L ball mill, the broken coal slime Buffer Pool of coal in M, coal slime Buffer Pool after coal mill in N, coal pan feeding pump in No. mono-, O, coal pan feeding pump in No. bis-, P, Q coarse grain is sized mixing agitator, R particulate is sized mixing agitator, S bis flotation machine, 1 enters float coal mud, 2 recirculated waters, 3 medicaments, 4 floatation clean coals, 5 one sections of floating tail-coals, 6 cyclone overflows, 7 cyclone underflows, 8 oversizes, 9 backwaters, 10 floating tail-coals, 11 coarse coal slurries, 12 heavy products, coal in 13 gravity treatments (comprise in block in coal and end coal) pan feeding, + 2mm material after 14 classifications, 152-0.5mm coarse slime, 16 classifying screen-0.5mm materials, the heavy product of 17 spirals, the light product of 18 spiral, 19 sieve bend screenings, 20 sieve bend oversizes, colliery slurry in particulate after 21 grindings, 22 size mixing after the broken coal slime of middle coal and the mixture that is mixed to get through piping of ore grinding fine coal slurry ore pulp, 23 bis flotation cleaned coal, 24 floating tail-coals.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are further described:
Example: as shown in Figure 1, the heavily floating combined sorting technique of coal in a kind of coking of the present invention.Enter float coal mud to flow automatically to after sizing mixing in one section of flotation device and realize sorting, obtain floatation clean coal and tail coal.One section of floating tail-coal carries out thickening through classifying cyclone and desliming screen, classifying cyclone overflow and desliming screen backwater together with follow-up floating tail-coal as floating tail-coal, through desliming screen desliming dehydration after tail coal coarse grain feed one section of separation of coarse slime machine carry out gravity treatment obtain coarse coal slurry with one section weight product.The breakdown products of coal in gravity treatment (comprise in block in coal and end coal) after impact breaker fragmentation feeds classifying screen classification and obtains+2mm coarse grain, 2-0.5mm coarse slime, the broken coal slime of-0.5mm, + 2mm material feeds slack coal separation system washing again,-0.5mm enters bis flotation operation, feed spiral together with 2-0.5mm coarse slime and the heavy product of one section of separation of coarse slime machine and obtain heavy product coarse grain spoil, after the light product desliming that spiral is thrown after tail, feed rod mill grinding dissociate to-0.074mm part and account for 40-50%.Under classifying screen ,-0.5mm material feeds single hop impeller and to size mixing agitator together with desliming screen screenings, fully ensures to size mixing the time (time of sizing mixing is not less than 4min) to guarantee the abundant absorption of flotation collector on coal grain surface; In particulate after rod mill grinding, coal coal slime feeds in multistage action of forced stirring size mixing equipment, this equipment is provided with three layers of agitator arm and speed of agitator high (agitator arm linear velocity is not less than 6m/s), make to dissociate particulate and flotation collector fully disperses in size mixing equipment, realize effective absorption of fine slime and collecting agent, when sizing mixing, suitable recirculated water should be added according to concentration requirement.In fragmentation after sizing mixing, coal coal slime and coal coal slime in ore grinding are mixed by pipeline and feed sorting to flotation device and obtain floatation clean coal and tail coal.Bis flotation tail coal and one section of floating tail-coal particulate are as tail coal mud product after subsequent treatment, and one section of floatation clean coal and bis flotation cleaned coal are incorporated in after processed as floatation clean coal product.By the heavily floating combined sorting technique of coal in coking, therefrom can reclaim the qualified cleaned coal of 40% in coal, ensure that making full use of of coking coal resource.
As shown in Figure 2, in a kind of coking of the present invention, the heavily floating combined sorting technique capital equipment of coal comprises one section of floatation feed size mixing agitator Q, particulate of coal slime Buffer Pool N after agitator A, a section of flotation device B, tail coal Buffer Pool C, classification pan feeding pump D, classifying cyclone E, high-frequency screen F, separation of coarse slime machine G, impact breaker H, classifying screen I, spiral J, sieve bend K, ball mill L, middle coal broken coal slime Buffer Pool M, middle coal mill, coal pan feeding pump O in No., coal pan feeding pump P in No. two, coarse grain of sizing mixing and to size mixing agitator R, bis flotation machine S.Entering float coal mud 1 sizing mixing adds certain medicament 3 in agitator A and sizes mixing, and can add recirculated water 2 during excessive concentration and regulate, after sizing mixing, ore pulp feeds in one section of flotation device B and carries out sorting, obtains one section of floatation clean coal 4 and one section of floating tail-coal 5.Tail coal ore pulp 5 is pumped in classifying cyclone K and carries out classification after Buffer Pool C cushions, and underflow 7 enters high-frequency screen F and carries out desliming dehydration, and cyclone overflow 6 merges as becoming tail coal product after subsequent treatment with backwater 9 and bis flotation tail coal.Oversize 8 feeds in one section of separation of coarse slime machine G and carries out sorting, obtains coarse coal slurry 11 and heavy product 12.Coal in gravity treatment (comprise in block in coal and end coal) pan feeding 13 is given to individual layer two sections of classifying screen I and carries out classification after impact breaker H fragmentation, + 2mm material 14 after classification returns slack coal separation system and selects, 2-0.5mm coarse slime 15 feeds sorting in spiral J together with one section of heavy product 12 of separation of coarse slime machine, the heavy product 17 of spiral is as coarse grain spoil, and light product 18 feeds rod mill L after sieve bend K dewaters to carry out grinding and dissociate.Sieve bend screenings 19 and classifying screen-0.5mm material 16 are pumped to coarse grain individual layer impeller and size mixing in agitator Q at certain speed of agitator and size mixing under the abundant time conditions that ensures to size mixing after cushion; In particulate after grinding, colliery slurry 21 is pumped under multistage action of forced stirring size mixing equipment R ensures high rotating speed input of sizing mixing under the time of necessarily sizing mixing and makes particulate ore pulp and medicament fully disperse to size mixing after buffering.The broken coal slime of middle coal after sizing mixing carries out sorting from flowing in bis flotation machine S with ore grinding fine coal slurry ore pulp after piping mixes, the bis flotation cleaned coal 23 and the floating tail-coal 24 that obtain.One section of floatation clean coal 4 together with bis flotation cleaned coal 23 as floatation clean coal, two sections of tail coals 24 together with one section of floating tail-coal particulate (cyclone overflow 6 and desliming screen backwater 9) as floating tail-coal 10.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.
Claims (4)
1. the heavily floating combined sorting technique of coal in coking, is characterized in that:
A, separation of coarse slime operation: one section of floating tail-coal coarse grain is fed in one section of separation of coarse slime machine the low ash particle used in gravity treatment recovery flotation in coal-tail coal coarse grain, effectively can solve the thick problem of race because classifying equipoment efficiency difference exceeds the flotation upper limit or occurs because flotation effect difference; After utilizing two sections of separation of coarse slime machines to carry out throwing tail the non-low grey coarse grain in the coarse slime after coal fragmentation in gravity treatment and one section of floating tail-coal, ore grinding dissociates, avoid energy charge that the ore grinding of the grey coarse grain of height is brought and the adverse effect to flotation, reduce the thin mud amount of high ash;
B, two sections of flotation operations of sizing mixing: the different requirements from middle coal ore grinding fine coal slurry, energy of sizing mixing inputted according to the broken coal slime of middle coal; when sizing mixing respectively by guarantee, the m-time of sizing mixing is not less than 4min and intensity-agitator arm linear velocity of sizing mixing is not less than 6m/s and realizes the abundant absorption of coarse grain and medicament and effective absorption of particulate and medicament; thus increase the flotation coarse grain rate of recovery and particulate selective; in after sizing mixing, the broken coal slime of coal feeds floatation equipment sorting after mixing with middle coal ore grinding coal slime, simplifies sorting flow process.
2. the heavily floating combined sorting technique of coal in coking as claimed in claim 1, is characterized in that: the concrete grammar of described technique is as follows:
(1) one section of flotation operation of sizing mixing:
To enter float coal mud ore pulp to flow automatically to be given in flotation device/post after agitator is sized mixing and carry out sorting, obtain one section of floatation clean coal and one section of floating tail-coal, floatation clean coal enters follow-up dehydration link becomes final products, and tail coal ore pulp enters subsequent hierarchical dewatering operation;
(2) Dewatering operation:
Be pumped to classifying cyclone after one section of flotation device floating tail-coal enters tail coal pond buffering and carry out classification, classifying cyclone underflow enters the further desliming dehydration of desliming oscillating screen, the overflow of classifying cyclone is as floating tail-coal together with desliming screen backwater, and in desliming screen oversize-flotation, coal enters the sorting of separation of coarse slime machine;
(3) crushing and screening operation:
In gravity treatment, coal enters impact breaker and carries out selective crushing and dissociate, broken rear material enters classifying screen and carries out classification, wherein+2mm coarse grain turns back to slack coal separation system and selects, and 2-0.5mm feeds spiral and carries out sorting, and the broken coal slime of-0.5mm enters bis flotation operation;
(4) separation of coarse slime operation:
This Partial Jobs comprises two sections of sortings, coal in tail coal coarse grain-flotation in one section of separation of coarse slime machine sorting, one section of flotation operation, coarse coal slurry and heavy product can be obtained after sorting, two sections of spiral sortings, one section of 2-0.5mm coarse slime weighed in product and gravity treatment after coal fragmentation, flotation again after light product ore grinding after throwing tail dissociates, two sections heavy products are coarse grain spoil; (5) desliming operation:
Two sections of spiral light products enter sieve bend and carry out desliming dehydration, and oversize enters grinding machine and dissociates, and sieve bend screenings enters follow-up separation operation of sizing mixing together with double-deck classifying screen-0.5mm material;
(6) ore grinding dissociates operation:
Oversize in step (5) after dehydration desliming-thick middle coal slime enters grinding in coal pulverizer and dissociates, working speed is the 65%-85% of critical speed, granularity of dissociating after dissociating-0.074mm part accounts for 40-50%, and the middle colliery stock pump after dissociating is delivered to middle coal size mixing equipment and sized mixing;
(7) two sections of operations of sizing mixing:
The broken coal slime of the sieve bend screenings obtained in step (5) and double-deck classifying screen-0.5mm material-middle coal enters single hop impeller and to size mixing agitator, and the time of sizing mixing is not less than 4min to ensure that collecting agent and coal grain fully adsorb; Obtain in step (6) dissociate after middle colliery slurry-ore grinding fine coal slurry enter in multistage action of forced stirring size mixing equipment, agitator arm linear velocity is not less than 6m/s;
(8) bis flotation operation:
The broken coal slime of middle coal and middle coal ore grinding coal slime enter in bis flotation equipment after sizing mixing carries out sorting, the bis flotation cleaned coal obtained and two sections of tail coals, one section of floatation clean coal is as final floatation clean coal together with bis flotation cleaned coal, and two sections of tail coals are as floating tail-coal.
3. the heavily floating combined sorting technique of coal in coking as claimed in claim 2, is characterized in that: in step (3), in described gravity treatment, coal comprises coal in coal in block, end.
4. the heavily floating combined sorting technique of coal in coking as claimed in claim 2, it is characterized in that: in step (7), when the broken coal slime of middle coal and middle coal ore grinding coal slime carry out sizing mixing operation, add diesel oil or kerosene as flotation collector, consumption is 100-300g/t, ensures that into floating pulp density be 60-80g/L by adding the water yield.
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| CN105797831A (en) * | 2016-03-22 | 2016-07-27 | 中国矿业大学 | Dissociation and reselection process for coal in coking breeze |
| WO2017161922A1 (en) * | 2016-03-22 | 2017-09-28 | 中国矿业大学 | Process for liberating and separating slack middling obtained from coking |
| RU2677339C1 (en) * | 2016-03-22 | 2019-01-16 | Чайна Юниверсити Оф Майнинг Энд Текнолоджи | Method of release and enrichment of dust coal, obtained from coking |
| AU2016399293B2 (en) * | 2016-03-22 | 2019-04-18 | China University Of Mining And Technology | Process for liberating and separating slack middling obtained from coking |
| CN106669961A (en) * | 2016-06-20 | 2017-05-17 | 中国矿业大学 | Process for recycling fine coal from middlings |
| CN106311458A (en) * | 2016-10-10 | 2017-01-11 | 神华集团有限责任公司 | Teeter bed separator (TBS) tailing separation system and separation method |
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