CN102211087A - Air and heavy medium dry coal preparation process - Google Patents
Air and heavy medium dry coal preparation process Download PDFInfo
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- CN102211087A CN102211087A CN2011101339090A CN201110133909A CN102211087A CN 102211087 A CN102211087 A CN 102211087A CN 2011101339090 A CN2011101339090 A CN 2011101339090A CN 201110133909 A CN201110133909 A CN 201110133909A CN 102211087 A CN102211087 A CN 102211087A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000007873 sieving Methods 0.000 claims abstract description 5
- 238000012216 screening Methods 0.000 claims description 47
- 238000005516 engineering process Methods 0.000 claims description 28
- 239000000047 product Substances 0.000 claims description 18
- 238000013467 fragmentation Methods 0.000 claims description 16
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- 238000007667 floating Methods 0.000 claims description 10
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- 239000006227 byproduct Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000000746 purification Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
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- 230000002950 deficient Effects 0.000 abstract description 7
- 238000003911 water pollution Methods 0.000 abstract description 5
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Abstract
The invention provides an air and heavy medium dry coal preparation process. Gangue is separated from raw coal through dynamic air and a heavy medium, and cleaned coal is prepared. The process comprises the following steps of: crushing and sieving the raw coal twice; conveying the sieved block coal into a separator; introducing the dynamic air and the heavy medium into the separator for separation; and removing the medium to obtain the cleaned coal and the gangue, and performing environment-friendly treatment on tailings and the discharged air. The dry coal preparation process employing the dynamic air and the heavy medium replaces wet coal preparation, can well solve the problem of coal separation in a water-deficient area, and saves water sources; the system is simple, and a complicated coal slime water treatment system in wet coal preparation is saved; meanwhile, coal slime water pollution is avoided, the quantity of equipment is small, power consumption is low, energy is saved, environment is protected, and the efficiency of a coal preparation process flow is effectively improved.
Description
Technical field
The present invention relates to the coal preparation technology field, more specifically, relate to a kind of technology with power air and dense media dry coal preparation.
Background technology
Known efficient coal preparation technique technology all is to adopt the sorting process technology of wet method basically at present, in coal preparation technique, must make water carry out the separation process of mineral and spoil as medium exactly, thereby have in system, increase the process procedure that a lot of black waters are handled, make its technical process become complicated, project investment and production cost have been increased greatly, and the difficulty of managing, operating, and waste water resource, environment is caused tremendous influence, particularly process, make that coal preparation technique is difficult to carry out in the water-deficient area with to the sorting of low metamorphic grade coal.
Therefore, need provide a kind of new coal preparation technique, not adopt water to come separating mineral and spoil as medium, simultaneously simple to operate, the protection environment is applicable to the processing that separates to water-deficient area and low metamorphic grade coal.
Summary of the invention
In view of this; technical problem to be solved by this invention is, a kind of brand-new air dense medium dry coal preparation technology is provided, and not only can overcome the deficiency of the wet coal preparation technology that generally adopts at present; and technology advanced person, separating effect are good, simultaneously conserve water resource, protection environment.
The invention provides a kind of air dense medium dry coal preparation technology, from mineral, isolate spoil, make cleaned coal, may further comprise the steps with power air and dense media:
Preferably, in described step 102, the described fragmentation first time is that raw coal is crushed to the lump coal of granularity less than 300mm, the described screening first time is to sieve through the sieve of broken lump coal with aperture 50mm, obtain the lump coal that oversize is granularity 50～300mm, screenings is the broken coal of granularity less than 50mm;
In described step 104, the described fragmentation second time is that screenings and the described oversize of sorting out foreign material that the described first time, screening obtained are put together, carry out being crushed to for the second time the lump coal of granularity less than 13mm, the described screening second time is to sieve through the sieve of broken for the second time lump coal with aperture 1mm, obtain the lump coal that oversize is granularity 1～13mm, screenings is the described smalls of granularity less than 1mm, stores as the smalls product.
Preferably, also comprise step 105 between step 104 and step 106, will carry out preliminarily dried through the oversize of the described screening second time, make its humidity satisfy the requirement of sorting, the smalls that produces in described dry run stores as product.
Preferably, described dense media comprises tri-iron tetroxide and silica.
Preferably, in described step 106, the feeding of described power air is finished by air feed system.
Preferably, in described step 106, in described separator, replenish the described dense media of interpolation according to the concentration of dense media described in the described separator.Because cleaned coal and spoil all will be taken away a spot of dense media in assorting room, add a spot of medium so need in assorting room, replenish, satisfy the needs of sorting, guarantee the quality of sorting.
Preferably, the product in the described air dense medium dry coal preparation technical process comprises major product and byproduct, and described major product is described cleaned coal, and described byproduct comprises described smalls, described fine coal and described spoil.
Adopt the way of twice fragmentation, twice screening can improve the quality of coal separation, can satisfy effective sorting of the mineral of 300～1mm particle size fraction.Simultaneously, adopt air dense medium method sorting also to solve the water-deficient area coal separation and be difficult to the problem of carrying out, can finish effective sorting of low rank coal (as brown coal, jet coal) well, improve its ature of coal than the highland, the conserve water resource, saved complicated numerous and complicated slurry circulating system in the wet coal preparation, avoided the black water pollution, equipment is simple, power consumption is low, and is energy-conservation; The construction investment cost saves 1/5～1/3 than wet coal preparation.
In step 106, described assorting room also comprises air-supply in described separator, will discharge described separator through the air after the sorting.The air dense medium dry separation need be supplied a spot of low-pressure air, so be provided with air feed system; In air dense medium dry separation process, need ceaselessly to blow, air draft, so also be provided with air draft, dust separation system, make the air of discharge satisfy environmental protection requirement fully.
By air medium dry coal preparation technology provided by the invention, can well finish effective sorting of the coal (as brown coal, jet coal) of low metamorphic grade, improve its ature of coal than the highland; Sorting is water not, can solve the sorting problem of water-deficient area coal well, the conserve water resource; System is simple, has saved complicated numerous and complicated slurry circulating system in the wet coal preparation, has avoided the black water pollution simultaneously, and the table of equipment number is few, power consumption is low, energy-conservation; By using different medium solids, the wide region that can reach separating density is regulated, thereby the realization high density is discharged pure spoil, the effect of low-density sorting quality fine coal; Construction investment saves 1/5 to 1/3 with production cost than present wet split technology with scale.
Description of drawings
Fig. 1 shows the FB(flow block) according to air dense medium dry coal preparation technology of the present invention;
Fig. 2 shows the FB(flow block) according to the air dense medium dry coal preparation technology of one embodiment of the invention;
Fig. 3 shows the process chart that carries out coal separation according to air dense medium dry coal preparation process flow diagram shown in Figure 2.
The specific embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with the drawings and specific embodiments.
Set forth a lot of details in the following description so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Fig. 1 shows the schematic flow sheet of air dense medium dry coal preparation technology according to an embodiment of the invention.
As shown in Figure 1, the invention provides a kind of air dense medium dry coal preparation technology, from raw coal, isolate spoil, make cleaned coal, may further comprise the steps with power air and dense media:
Preferably, in described step 104, the described fragmentation second time is that screenings and the described oversize of sorting out foreign material that the described first time, screening obtained are put together, carry out being crushed to for the second time the lump coal of granularity less than 13mm, the described screening second time is to sieve through the sieve of broken for the second time lump coal with aperture 1mm, obtain the lump coal that oversize is granularity 1～13mm, screenings is the described smalls of granularity less than 1mm, stores as the smalls product.
Preferably, also comprise step 105 between step 104 and step 106, will carry out preliminarily dried through the oversize of the described screening second time, make its humidity satisfy the requirement of sorting, the smalls that produces in described dry run stores as product.Be in the such scheme, after step 104, if if the oversize surface moisture can reach the requirement of air dense medium dry separation, just can directly enter sorting in the air dense medium dry method cull eliminator, promptly directly enter step 106, if the material surface moisture is higher than the requirement of air dense medium dry separation, will carry out preliminary drying,, enter sorting in the air dense medium dry method cull eliminator again after reaching requirement to slough the moisture on material surface, before promptly entering step 106, pass through step 105 again.
Preferably, described dense media comprises tri-iron tetroxide and silica.
Further, in described step 106, the feeding of described power air is finished by air feed system.
Further, in described step 106, in described separator, replenish the described dense media of interpolation according to the concentration of dense media described in the described separator.Because cleaned coal and spoil all will be taken away a spot of dense media in assorting room, add a spot of medium so need in assorting room, replenish, satisfy the needs of sorting, guarantee the quality of sorting.
Product in the described air dense medium dry coal preparation technical process comprises major product and byproduct, and described major product is described cleaned coal, and described byproduct comprises described smalls, described fine coal and described spoil.
Adopt the way of twice fragmentation, twice screening can improve the quality of coal separation, can satisfy effective sorting of the mineral of 300～1mm particle size fraction.Simultaneously, adopt air dense medium method sorting also to solve the water-deficient area coal separation and be difficult to the problem of carrying out, can finish effective sorting of low rank coal (as brown coal, jet coal) well, improve its ature of coal than the highland, the conserve water resource, saved complicated numerous and complicated slurry circulating system in the wet coal preparation, avoided the black water pollution, equipment is simple, power consumption is low, and is energy-conservation; The construction investment cost saves 1/5～1/3 than wet coal preparation.As shown in Figures 2 and 3, be the FB(flow block) and the process chart of one embodiment of the invention, wherein Fig. 2 shows the FB(flow block) of this embodiment, and Fig. 3 shows the process chart of this embodiment.
As shown in Figure 2, the air dense medium dry coal preparation technological process that provides of present embodiment comprises:
In the above-mentioned steps, because various products can be taken away a small amount of dense media, so need in assorting room, add a spot of dense media.
Fig. 3 shows the process chart that carries out coal separation according to air dense medium dry coal preparation technological process shown in Figure 2.
The coal separation flow process of air dense medium dry coal preparation technology as shown in Figure 3 can adopt dry method successfully spoil to be separated from coal cinder, improves the quality of coal separation, and power consumption simultaneously is few, conserve water resource, protection environment.
What when implementing technology of the present invention, at first to carry out based on employed feedstock property, the product that needs to produce quality, the conditions such as scale of production.After these primary conditions are determined, need carry out meticulous design, adopt this air dense medium dry coal preparation technology, make each link of the concrete technological process that to adopt, calculate, select correspondingly equipment, facility through detailed, accurate, it is individual professional well-designed to be equipped with water, warm, electricity, mechanism, civil engineering etc., through professional construction, form a whole set of complete production line, just can carry out actual production.
By air dense medium dry coal preparation technology provided by the invention, can well finish effective sorting of the coal (as brown coal, jet coal) of low metamorphic grade, improve its ature of coal than the highland; Sorting is water not, can solve the sorting problem of water-deficient area coal well, the conserve water resource; System is simple, has saved complicated numerous and complicated slurry circulating system in the wet coal preparation, has avoided the black water pollution simultaneously, and the table of equipment number is few, power consumption is low, energy-conservation; By using different dense media, the wide region that can reach separating density is regulated, thereby the realization high density is discharged pure cash, the effect of low-density sorting quality fine coal; Construction investment saves 1/5 to 1/3 with production cost than present wet split technology with scale.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. an air dense medium dry coal preparation technology is characterized in that, isolates spoil from raw coal, makes cleaned coal with power air and dense media, may further comprise the steps:
Step 102 is carried out the broken and screening for the first time first time with described raw coal, and oversize is carried out picking, sorts out foreign material wherein;
Step 104 is carried out the fragmentation second time with the described oversize of sorting out foreign material, carries out the screening second time together with the screenings that the described first time, screening obtained then, and stores as smalls sieving the screenings that obtains for the second time;
Step 106 will be added described dense media and feed described power air through in the oversize input separator that the described second time, screening obtained in described separator, carry out dense medium separation, obtains floating thing and hypostasis;
Step 108, described floating thing and described hypostasis are carried out the processing of de-mediated matter respectively, from described floating thing, isolate described cleaned coal, isolate described spoil from described hypostasis, obtain qualified dense media and rare medium simultaneously, the residual thing that will isolate then behind described cleaned coal and the described spoil mixes, obtain mixture, described qualified medium is through shunting, and a part is fed back in the described separator, and remainder and described rare medium add in the described mixture;
Step 110, the described mixture that adds described qualified dense media and rare medium is purified recycling, obtain containing the concentrate and tailings of described dense media, concentrate is fed back in the described separator, mine tailing obtains fine coal through environmental protection treatment, and described concentrate is fed back in the described separator;
Step 112 is carried out dedusting, purification with the described power air of discharging in the described separator, obtains dust and free of contamination air, and described dust added obtains described fine coal in the described mine tailing after environmental protection treatment, and described free of contamination air enters in the atmosphere.
2. air dense medium dry coal preparation technology according to claim 1 is characterized in that,
In described step 102, the described fragmentation first time is that raw coal is crushed to the lump coal of granularity less than 300mm, the described screening first time, be to sieve through the sieve of the lump coal after the described fragmentation first time with aperture 50mm, obtain the lump coal that oversize is granularity 50～300mm, screenings is the broken coal of granularity less than 50mm;
In described step 104, the described fragmentation second time is to put together sieving screenings that obtains and the described oversize of sorting out foreign material the described first time, carry out being crushed to for the second time the lump coal of granularity less than 13mm, the described screening second time, be to sieve through the sieve of the lump coal after the described fragmentation second time with aperture 1mm, obtain the lump coal that oversize is granularity 1～13mm, screenings is the described smalls of granularity less than 1mm.
3. according to claim 1 or 2 described air dense medium dry coal preparation technologies, it is characterized in that, between step 104 and step 106, also comprise step 105, to carry out preliminarily dried through the described oversize after the described screening second time, make its humidity satisfy the requirement of sorting, the smalls that produces in described preliminarily dried process stores as product.
4. air dense medium dry coal preparation technology according to claim 3 is characterized in that described dense media comprises tri-iron tetroxide and silica.
5. air dense medium dry coal preparation technology according to claim 3 is characterized in that in described step 106, the feeding of described power air is finished by air feed system.
6. air dense medium dry coal preparation technology according to claim 3 is characterized in that, in described step 106, replenishes the described dense media of interpolation according to the concentration of dense media described in the described separator in described separator.
7. air dense medium dry coal preparation technology according to claim 3, it is characterized in that, product in the described air dense medium dry coal preparation technical process comprises major product and byproduct, and described major product is described cleaned coal, and described byproduct comprises described smalls, described fine coal and described spoil.
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Cited By (20)
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| CN102416386A (en) * | 2011-10-27 | 2012-04-18 | 山东博润工业技术有限公司 | Dry-method coal gangue discharge and coal dressing process and system |
| CN102627977A (en) * | 2012-03-30 | 2012-08-08 | 中国矿业大学(北京) | Method for expanding coking coal resources |
| CN103341398A (en) * | 2013-06-18 | 2013-10-09 | 王成江 | Coal separation method in which lump coal and fine coal dense media share same recovery system |
| CN103433121A (en) * | 2013-08-29 | 2013-12-11 | 永城煤电控股集团有限公司 | Dense-medium and low-density separation process |
| CN103785529A (en) * | 2014-03-10 | 2014-05-14 | 衢州市易凡设计有限公司 | A washing equipment for coal with high ash, high mud and high gangue |
| CN104148164A (en) * | 2014-07-04 | 2014-11-19 | 中国海洋石油总公司 | Method for coal washing by means of carbon dioxide |
| CN104212470A (en) * | 2014-09-17 | 2014-12-17 | 中国矿业大学(北京) | Dry-method preconcentration waste rack discharge-dry distillation process by dry method for oil shale |
| CN105080702A (en) * | 2015-09-06 | 2015-11-25 | 中国矿业大学 | Efficient coal derived pyrite dry-method enrichment process and system |
| CN105170465A (en) * | 2015-08-28 | 2015-12-23 | 长沙深湘通用机器有限公司 | Gravity concentration method |
| CN105537121A (en) * | 2016-01-27 | 2016-05-04 | 北京神雾环境能源科技集团股份有限公司 | System and method for treating low-rank coal |
| CN105537120A (en) * | 2016-01-27 | 2016-05-04 | 北京神雾环境能源科技集团股份有限公司 | System and method for treating low-rank coal |
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| CN105750075A (en) * | 2014-03-10 | 2016-07-13 | 衢州市易凡设计有限公司 | Device for washing separation of high-ash, high-clay and high-gangue coal |
| CN106179676A (en) * | 2016-07-18 | 2016-12-07 | 淮南矿业(集团)有限责任公司 | A kind of dry coal preparation and processing method |
| CN109317289A (en) * | 2018-11-14 | 2019-02-12 | 王光领 | Dry sand medium preparation process is used on air dry sand Recognition Applied in Coal Preparation System |
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| CN102416386A (en) * | 2011-10-27 | 2012-04-18 | 山东博润工业技术有限公司 | Dry-method coal gangue discharge and coal dressing process and system |
| CN102627977A (en) * | 2012-03-30 | 2012-08-08 | 中国矿业大学(北京) | Method for expanding coking coal resources |
| CN103341398B (en) * | 2013-06-18 | 2014-10-29 | 王成江 | Coal separation method in which lump coal and fine coal dense media share same recovery system |
| CN103341398A (en) * | 2013-06-18 | 2013-10-09 | 王成江 | Coal separation method in which lump coal and fine coal dense media share same recovery system |
| CN103433121A (en) * | 2013-08-29 | 2013-12-11 | 永城煤电控股集团有限公司 | Dense-medium and low-density separation process |
| CN103785529A (en) * | 2014-03-10 | 2014-05-14 | 衢州市易凡设计有限公司 | A washing equipment for coal with high ash, high mud and high gangue |
| CN105750076A (en) * | 2014-03-10 | 2016-07-13 | 衢州市易凡设计有限公司 | Washing separation device for high-ash, high-clay and high-gangue coal |
| CN105750075A (en) * | 2014-03-10 | 2016-07-13 | 衢州市易凡设计有限公司 | Device for washing separation of high-ash, high-clay and high-gangue coal |
| CN105944823A (en) * | 2014-03-10 | 2016-09-21 | 衢州市易凡设计有限公司 | Equipment for washing high-ash, high-mud and high-gangue stone coal |
| CN104148164A (en) * | 2014-07-04 | 2014-11-19 | 中国海洋石油总公司 | Method for coal washing by means of carbon dioxide |
| CN104148164B (en) * | 2014-07-04 | 2016-09-21 | 中国海洋石油总公司 | A kind of method utilizing carbon dioxide to carry out coal washing |
| CN104212470A (en) * | 2014-09-17 | 2014-12-17 | 中国矿业大学(北京) | Dry-method preconcentration waste rack discharge-dry distillation process by dry method for oil shale |
| CN105170465A (en) * | 2015-08-28 | 2015-12-23 | 长沙深湘通用机器有限公司 | Gravity concentration method |
| CN105080702A (en) * | 2015-09-06 | 2015-11-25 | 中国矿业大学 | Efficient coal derived pyrite dry-method enrichment process and system |
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