CN103341398A - Coal separation method in which lump coal and fine coal dense media share same recovery system - Google Patents
Coal separation method in which lump coal and fine coal dense media share same recovery system Download PDFInfo
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- CN103341398A CN103341398A CN2013102408133A CN201310240813A CN103341398A CN 103341398 A CN103341398 A CN 103341398A CN 2013102408133 A CN2013102408133 A CN 2013102408133A CN 201310240813 A CN201310240813 A CN 201310240813A CN 103341398 A CN103341398 A CN 103341398A
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- 239000003245 coal Substances 0.000 title claims abstract description 140
- 238000000926 separation method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000007885 magnetic separation Methods 0.000 claims abstract description 7
- 230000001404 mediated effect Effects 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000010866 blackwater Substances 0.000 claims description 21
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 238000002360 preparation method Methods 0.000 claims description 12
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- YTAHJIFKAKIKAV-XNMGPUDCSA-N [(1R)-3-morpholin-4-yl-1-phenylpropyl] N-[(3S)-2-oxo-5-phenyl-1,3-dihydro-1,4-benzodiazepin-3-yl]carbamate Chemical compound O=C1[C@H](N=C(C2=C(N1)C=CC=C2)C1=CC=CC=C1)NC(O[C@H](CCN1CCOCC1)C1=CC=CC=C1)=O YTAHJIFKAKIKAV-XNMGPUDCSA-N 0.000 claims description 2
- 239000000725 suspension Substances 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000006148 magnetic separator Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 241000234295 Musa Species 0.000 description 2
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 2
- 239000003250 coal slurry Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of coal, relates to a dense medium coal separation method, in particular to a coal separation method in which lump coal and fine coal dense media share a same recovery system. The method includes the steps that classification desliming is conducted on raw coal, lump coal dense medium separation is conducted on the lump coal, and fine coal dense medium separation is conducted on first fine coal after being desliming; second lump clean coal and second fine clean coal are combined, then secondary medium draining classification is conducted on the second lump clean coal and the second fine clean coal, lump gangues and second fine gangues are combined, then secondary medium draining is conducted on the lump gangues and the second fine gangues, and qualified media are acquired through magnetic separation and fed to lump coal dense medium separation and fine coal dense medium separation after shunt. The second lump clean coal and the second fine clean coal are combined, and secondary medium draining classification is conducted on both the second lump clean coal and the second fine clean coal at the same time, so that the suspension liquid density of the lump coal dense media and the suspension liquid density of the fine coal dense media are independently adjusted. The method is simple in process, easy and convenient to operate, good in operational stability, high in classification accuracy, flexible in product structure, and low in investment and operating cost.
Description
Technical field
The invention belongs to the colliery engineering field.Particularly, the present invention relates to the heavy media coal separation method, particularly the shared coal preparation method of a kind of lump coal and smalls dense media recovery system.
Background technology
The heavy media coal separation method has obtained commercial Application widely.According to the material size difference two kinds of dense medium separation technologies are arranged: preparation of unsized raw coal, preparation of sized raw coal.In preparation of unsized raw coal technology, lump coal and smalls mix, enter heavy medium cyclone simultaneously, in same heavy-media suspension environment, separate, it is relatively poor that this technology is formed the bigger coal adaptability of difference to lump coal and smalls density, in addition, the wide grade of pan feeding distributes and has reduced separating effect significantly.And both mix flexibility and the market adaptability that has reduced product structure.In preparation of sized raw coal technology, selected separately after both classifications, lump coal separation and smalls sorting are two independently systems, its medium recovery system is separate, the complexity that this has not only strengthened sorting process has increased screening installation quantity, has also increased substantially investment and operating cost.
Summary of the invention
Therefore, the objective of the invention is at the deficiencies in the prior art, provide that a kind of technology is simple, easy to operate, sharpness of separation is high, good operation stability, product structure flexibly, investment and the cheap lump coal coal preparation method shared with smalls dense media recovery system of operating cost.
At above-mentioned purpose, technical scheme of the present invention may further comprise the steps:
A) raw coal is carried out graded desliming, obtain lump coal, first smalls and first black water;
b
1) lump coal that obtains in the step a) is carried out the lump coal dense medium separation, obtain first block of cleaned coal and piece spoil;
b
2) first smalls that obtains in the step a) is carried out desliming, obtain second smalls and coal slime; Preferably, gained second smalls enters mixing tank, carries out the smalls dense medium separation, obtains first fine cleaned coal and the first last spoil;
c
1) with step b
1) in first block of cleaned coal obtaining carry out a de-mediated, obtain second block of cleaned coal and first qualified medium;
c
2) with step b
2) in first fine cleaned coal that obtains carry out a de-mediated, obtain second fine cleaned coal and second qualified medium;
D) with step c
1) in the second block of cleaned coal and the step c that obtain
2) in second fine cleaned coal that obtains merge, carry out secondary de-mediated classification, obtain the 3rd block of cleaned coal, the 3rd fine cleaned coal, the 3rd qualified medium and first rare medium;
E) the 3rd fine cleaned coal that obtains in the step d) is carried out centrifugal dehydration, obtain the 4th fine cleaned coal and second black water.
According to method of the present invention, described method also comprises step f): the first last spoil is carried out a de-mediated, obtain the second last spoil and the 4th qualified medium.
According to method of the present invention, described method also comprises step g): piece spoil and the second last spoil are merged, carry out the secondary de-mediated, obtain spoil, second rare medium and pentahapto lattice medium.
According to method of the present invention, described method also comprises step h): first qualified medium enters the qualified medium bucket, and second qualified medium, the 4th qualified medium and pentahapto lattice medium enter mixing tank.
According to method of the present invention, described method also comprises step I): the 3rd qualified medium is shunted, the part shunting enters the qualified medium bucket, the part shunting merges with first rare medium and second rare medium, carry out magnetic separation, obtain the 3rd black water and dense medium, preferably, described dense medium enters qualified medium bucket and mixing tank after shunting.
The mixture that qualified medium is made up of less than the coal slime of 0.5mm water, magnetite powder and particle diameter, three's proportionate relationship has determined the density of qualified medium.The inventor finds, by the 3rd qualified medium is shunted, can regulate the ratio of nonmagnetics in the qualified medium bucket well, i.e. the coal slime ratio.In one embodiment of the invention, the shunt volume of the 3rd qualified medium can be control like this: at medium pipeline the magnetic material content meter that can measure coal slurry content in the qualified medium bucket is housed, coal slurry content measured value and setting value are compared, regulate and control the open degree of shunting according to comparative result.For example, when measured value is higher than setting value, can increase open degree, thereby improve the shunt volume that enters in the magnetic separator; When measured value is lower than setting value, can reduces open degree, thereby reduce the shunt volume that enters in the magnetic separator.Setting value can be determined according to actual production scale and separating density, and the selection of setting value is known those skilled in the art.
The inventor also finds, by dense medium is shunted, can regulate the ratio of dense medium well.In one embodiment of the invention, this shunting can be regulated and control by the following method: the export pipeline at qualified medium bucket and mixing tank is separately installed with densitometer, the quantity of circulating water that control is added according to the densitometer size is according to quantity of circulating water control shunt volume.For example, when the densitometer show value is higher than required value, increase the amount of adding recirculated water, reduce the shunt volume of dense medium simultaneously.If the quantity of circulating water of adding reduces always, illustrate that then the shunt volume of dense medium is few, then need many shuntings, reach stationary value up to the quantity of circulating water of adding.Required value can be determined according to actual production scale and separating density, and the selection of required value is known those skilled in the art.
According to method of the present invention, described method also comprises step j): described first black water, second black water, the 3rd black water and coal slime are entered slurry circulating system.
According to method of the present invention, described method also comprises step k): the qualified medium in the described qualified medium bucket is fed the lump coal dense medium separation.
According to method of the present invention, described method also comprises step l): in described qualified medium bucket, add magnetite powder and recirculated water; Preferably, also comprise step m): in described mixing tank, add magnetite powder and recirculated water.
In said method, the purpose that adds magnetite powder and recirculated water is the density that adjusts from the heavy-media suspension of qualified medium bucket and mixing tank.The amount of the magnetite powder that product is taken away after preferably (but being not limited to), the addition of magnetite powder and sorting equates.For example, can be according to " regulation in the coal preparation technique design practical technique handbook is determined the addition of magnetite powder, and namely per ton block of cleaned coal and piece spoil are all taken away the 0.3kg magnetite powder, and fine cleaned coal per ton and last spoil are all taken away the 0.6kg magnetite powder.
According to method of the present invention, described method also comprises step n): in the secondary de-mediated step described in the step g), add recirculated water.
According to method of the present invention, described method also comprises step o): to graded desliming step, the step b described in the step a)
2) described in the desliming step and/or the described secondary de-mediated of step d) classification step in add recirculated water.
The inventor finds, adds the effect that recirculated water can strengthen graded desliming, desliming and/or secondary de-mediated classification significantly in said method.Preferably (but being not limited to), the addition of recirculated water can according to " coal washing engineering design standard GB50359-2010 " and " regulation in the coal preparation technique design practical technique handbook be carried out, i.e. injection flow rate during graded desliming and desliming is 2.0m
3/ ton coal, the injection flow rate during secondary de-mediated classification is 1.5m
3/ ton coal.
Except as otherwise noted, the raw coal described in the present invention refers to from the coal of down-hole extraction, through prescreening (screen-aperture can for but be not limited to 150mm) or with the particle diameter that obtains after the coarse coal fragmentation of particle diameter greater than the 150mm coal less than 150mm.
Except as otherwise noted, first smalls described in the present invention refers to obtain smalls after the classified desliming of raw coal, second smalls refers to the smalls that first smalls obtains after desliming, wherein, " first " and " second " there is no concrete implication, only distinguishes for the material that different step is obtained same title.Similarly, among the present invention all the other everywhere described " first ", " second ", " the 3rd ", " the 4th " and " the 5th " material that also only is used for same title that different step is obtained distinguish.
It will be appreciated by those skilled in the art that and to select various known equipment to be used for each step of the method for the invention according to actual production scale.For example, in conventional equipment, can select the graded desliming sieve to be used for graded desliming of the present invention, select the dense media shallow-tank separator to be used for lump coal dense medium separation of the present invention, select desliming screen to be used for desliming of the present invention, the cyclone of selecting heavily to be situated between is used for smalls dense medium separation of the present invention, select gravity flow screen to be used for a de-mediated of first block of cleaned coal of the present invention, select fine cleaned coal de-mediated sieve bend to be used for a de-mediated of first fine cleaned coal of the present invention, select cleaned coal vibration de-mediated classifying screen to be used for the secondary de-mediated classification of second block of cleaned coal and second fine cleaned coal of merging of the present invention, select centrifugal dehydrator to be used for centrifugal dehydration of the present invention, select last spoil de-mediated sieve bend to be used for a de-mediated of the first last spoil of the present invention, select spoil vibration sculping screen to be used for the piece spoil of merging of the present invention and the secondary de-mediated of the second last spoil, select part flow arrangement to be used for shunting of the present invention, select magnetic separator to be used for magnetic separation of the present invention.
Compared with prior art, the present invention has following beneficial effect at least:
(1) piece spoil and second block of cleaned coal all enter smalls de-mediated system, have saved step and equipment such as piece spoil vibration sculping screen and piece cleaned coal vibration sculping screen in the prior art, have both simplified technology, have reduced cost again;
(2) in that second block of cleaned coal and second fine cleaned coal are merged, carry out secondary de-mediated classification jointly, realized the independent regulation of lump coal and smalls heavy-media suspension density, easy and simple to handle, good operation stability, sharpness of separation height;
(3) after piece spoil and the second last spoil carry out secondary de-mediated classification, first rare medium and second rare medium directly carry out magnetic separation, save step and equipment such as rare medium bucket, rare medium pump and corresponding wear-resisting pipeline in the prior art, reduced investment and operation cost.
Description of drawings
Below, describe embodiment of the present invention by reference to the accompanying drawings in detail, wherein:
Fig. 1 is the flow chart of an embodiment of coal preparation method of the present invention.
Description of reference numerals:
The 1-raw coal, 2,7,27,31,44-recirculated water, the 3-graded desliming, 4-first smalls, 5-lump coal, 6-first black water, the 8-desliming, 9-second smalls, 10-coal slime, 11-lump coal dense medium separation, 12-mixing tank, first block of cleaned coal of 13-, 14-piece spoil, 15-smalls dense medium separation, the 16-first last spoil, 17-first fine cleaned coal, 18,19, a de-mediated of 20-, 21-first qualified medium, second block of cleaned coal of 22-, the 23-second last spoil, 24-the 4th qualified medium, 25-second qualified medium, 26-second fine cleaned coal, the de-mediated of 28-secondary, 29-second rare medium, 30-pentahapto lattice medium, 32-secondary de-mediated classification, 33-the 3rd qualified medium, 34-first rare medium, 35-the 3rd fine cleaned coal, 36, the 42-shunting, the 37-centrifugal dehydration, 38-magnetic separation, 39-the 3rd black water, the dense medium of 40-, 41-second black water, 43-qualified medium bucket, the 45-magnetite powder, 46-spoil, 47-slurry circulating system, 48-the 4th fine cleaned coal, the 3rd block of cleaned coal of 49-.
The specific embodiment
Below in conjunction with embodiment, be that 2,000,000 tons/year coal preparation plant is example with production scale, the present invention is further described in detail, the equipment of selecting for use among illustrated embodiment and the embodiment and method of operating thereof only are used for explaining the present invention, be not that those skilled in the art can adopt other to have equipment identical with following equipment or close function and implement the present invention for restriction scope of the present invention.
As shown in Figure 1, adopt 1 graded desliming banana screen (model is WZDS-30 * 73) that raw coal (1) is carried out graded desliming (3), simultaneously with 90m
3The amount of/h adds recirculated water (2), to strengthen the graded desliming effect, obtains lump coal (5), first smalls (4) and first black water (6);
Adopt 1 dense-medium shallow-tank separator (model is MZC1048) that lump coal (5) is carried out lump coal dense medium separation (11), obtain first block of cleaned coal (13) and piece spoil (14);
Adopt 1 desliming banana (model is WZDS-30 * 61) sieve that first smalls (4) is carried out desliming (6), simultaneously with 129m
3The amount of/h adds recirculated water (7), to strengthen the desliming effect, obtains second smalls (9) and coal slime (10), and second smalls (9) enters mixing tank (12); Adopt 1 heavy medium cyclone (model is FZJ850) that second smalls (9) is carried out smalls dense medium separation (15) then, obtain first fine cleaned coal (17) and the first last spoil (16);
Adopt gravity flow screen that first block of cleaned coal (13) carried out a de-mediated (20), obtain second block of cleaned coal (22) and first qualified medium (21); Adopt 1 sieve bend (model is HFK2100) that first fine cleaned coal (17) is carried out a de-mediated (19), obtain second fine cleaned coal (26) and second qualified medium (25); Adopt 1 sieve bend (model is OSB1500) that the first last spoil (16) is carried out a de-mediated (18), obtain the second last spoil (23) and the 4th qualified medium (24);
Merge second block of cleaned coal (22) and second fine cleaned coal (26), (model is WZK-30 * 73, and sieve aperture 1mm 25mm) carries out it secondary de-mediated classification (32), simultaneously with 266m to adopt 1 cleaned coal vibration de-mediated classifying screen
3The amount of/h adds recirculated water (31), to strengthen secondary de-mediated grading effect, obtains the 3rd block of cleaned coal of oversize (49), screenings the 3rd fine cleaned coal (35), the 3rd qualified medium (33) and first rare medium (34); Adopt 1 horizontal centrifugal dehydrator (model is HM-1400) that the 3rd fine cleaned coal (35) is carried out centrifugal dehydration (37), obtain the 4th fine cleaned coal (48) and second black water (41);
Merge piece spoil (14) and the second last spoil (23), adopt 1 spoil vibration sculping screen (model is WZK-20 * 52, and the sieve seam is 1mm) that it is carried out secondary de-mediated (28), simultaneously with 73m
3The amount of/h adds recirculated water (27), to strengthen secondary de-mediated effect, obtains spoil (46), second rare medium (29) and the pentahapto lattice medium (30);
First qualified medium (21) is entered the qualified medium bucket (43) that diameter is 4.5m, and second qualified medium (29), the 4th qualified medium (24) and pentahapto lattice medium (30) enter the mixing tank that diameter is 4.0m (12); Adopt 1 current divider box that the 3rd qualified medium (33) is shunted, the part shunting enters qualified medium bucket (43), the part shunting merges with first rare medium (34) and second rare medium (29), (model is 914 * 2972LH) it to be carried out magnetic separation (38) to adopt 4 wet magnetic separators, obtain the 3rd black water (39) and dense medium (40), wherein dense medium (40) enters qualified medium bucket (43) and mixing tank (12) after 1 current divider box shunting;
Add magnetite powder (45) and add recirculated water (44) with the amount of 0.54t/h with the amount of 0.32t/h in the qualified medium bucket (43), add magnetite powder (45) and add recirculated water (44) to guarantee in qualified medium bucket (43) and the mixing tank (12) material being arranged all the time with the amount of 0.7t/h with the amount of 0.24t/h in the mixing tank (12), the qualified medium in the qualified medium bucket (43) is fed lump coal dense medium separation (11);
First black water (6), second black water (41), the 3rd black water (39) and coal slime (10) are entered slurry circulating system (47).
Although the present invention is described in detail; but should be appreciated that foregoing description is not in order to limit the present invention, under the situation that does not break away from the spirit and scope of the present invention; any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the coal preparation method that shares of a lump coal and smalls dense media recovery system, this method may further comprise the steps:
A) raw coal is carried out graded desliming, obtain lump coal, first smalls and first black water;
b
1) lump coal that obtains in the step a) is carried out the lump coal dense medium separation, obtain first block of cleaned coal and piece spoil;
b
2) first smalls that obtains in the step a) is carried out desliming, obtain second smalls and coal slime; Preferably, gained second smalls enters mixing tank, carries out the smalls dense medium separation, obtains first fine cleaned coal and the first last spoil;
c
1) with step b
1) in first block of cleaned coal obtaining carry out a de-mediated, obtain second block of cleaned coal and first qualified medium;
c
2) with step b
2) in first fine cleaned coal that obtains carry out a de-mediated, obtain second fine cleaned coal and second qualified medium;
D) with step c
1) in the second block of cleaned coal and the step c that obtain
2) in second fine cleaned coal that obtains merge, carry out secondary de-mediated classification, obtain the 3rd block of cleaned coal, the 3rd fine cleaned coal, the 3rd qualified medium and first rare medium;
E) the 3rd fine cleaned coal that obtains in the step d) is carried out centrifugal dehydration, obtain the 4th fine cleaned coal and second black water.
2. method according to claim 1 is characterized in that, described method also comprises step f): the first last spoil is carried out a de-mediated, obtain the second last spoil and the 4th qualified medium.
3. method according to claim 2 is characterized in that, described method also comprises step g): piece spoil and the second last spoil are merged, carry out the secondary de-mediated, obtain spoil, second rare medium and pentahapto lattice medium.
4. method according to claim 3 is characterized in that, described method also comprises step h): first qualified medium enters the qualified medium bucket, and second qualified medium, the 4th qualified medium and pentahapto lattice medium enter mixing tank.
5. according to claim 3 or 4 described methods, it is characterized in that, described method also comprises step I): the 3rd qualified medium is shunted, the part shunting enters the qualified medium bucket, the part shunting merges with first rare medium and second rare medium, carries out magnetic separation, obtains the 3rd black water and dense medium, preferably, described dense medium enters qualified medium bucket and mixing tank after shunting.
6. method according to claim 5 is characterized in that, described method also comprises step j): described first black water, second black water, the 3rd black water and coal slime are entered slurry circulating system.
7. according to each described method in the claim 4 to 6, it is characterized in that described method also comprises step k): the qualified medium in the described qualified medium bucket is fed the lump coal dense medium separation.
8. according to each described method in the claim 4 to 7, it is characterized in that described method also comprises step l): in described qualified medium bucket, add magnetite powder and recirculated water; Preferably, also comprise step m): in described mixing tank, add magnetite powder and recirculated water.
9. according to each described method in the claim 4 to 8, it is characterized in that described method also comprises step n): in the secondary de-mediated classification step described in the step g), add recirculated water.
10. according to each described method in the claim 1 to 9, it is characterized in that described method also comprises step o): to graded desliming step, the step b described in the step a)
2) described in the desliming step and/or the described secondary de-mediated of step d) classification step in add recirculated water.
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| CN105855066A (en) * | 2016-02-25 | 2016-08-17 | 徐浩军 | Flotation medium recovery system |
| CN109999991A (en) * | 2019-03-28 | 2019-07-12 | 通用技术集团工程设计有限公司 | A kind of thermal coal dense medium sorting process effectively reducing slime content |
| CN112371325A (en) * | 2020-09-21 | 2021-02-19 | 新汶矿业集团有限责任公司洗煤分公司 | Power coal grading washing process |
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