CN109174439B - Dense media step strengthens the method for recycling in a kind of coal preparation technique - Google Patents
Dense media step strengthens the method for recycling in a kind of coal preparation technique Download PDFInfo
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- CN109174439B CN109174439B CN201811156846.9A CN201811156846A CN109174439B CN 109174439 B CN109174439 B CN 109174439B CN 201811156846 A CN201811156846 A CN 201811156846A CN 109174439 B CN109174439 B CN 109174439B
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- coal
- coal slime
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- 239000003245 coal Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004064 recycling Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000006148 magnetic separator Substances 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000000696 magnetic material Substances 0.000 claims abstract description 9
- 230000001404 mediated effect Effects 0.000 claims abstract description 5
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 11
- 239000012141 concentrate Substances 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 description 9
- 238000007885 magnetic separation Methods 0.000 description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
Classifications
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides the method that dense media step in a kind of coal preparation technique strengthens recycling, comprising the following steps: raw coal enters dielectric film filter process after dense medium sorts after de-mediated, dehydration；Undersize material from qualified medium shunting and the dilute medium section of sculping screen, which collects into dilute medium bucket rear portion, enters coal slime-dielectric separator, another part enters weak magnetic separator, coal slime-dielectric separator separates magnetic material and coal slime using reelection and separation method, magnetic material product is back to qualified medium bucket, coal slime product enters intensity magnetic separator, intensity magnetic separator concentrate returns to qualified medium bucket, weak magnetic separator concentrate returns to qualified medium bucket, weak magnetic separator tailing enters intensity magnetic separator, and intensity magnetic separator tailing enters slime water treatment technique.The present invention carries out the preliminary recycling of dense media using coal slime and the density variation of dense media, its magnetic contrast is recycled to be recycled again, and recycling ability is gradually increased, and forms the recovery process that weight-magnetic joint step is strengthened.
Description
Technical field
The invention belongs to dense-medium separation fields, are related to heavy medium coal preparation process dielectric film filter technique, in particular to a kind of choosing
Dense media step strengthens the method for recycling in coal technique.
Background technique
The core that the heavy medium sorting process advantage high, high-efficient with its precision becomes current coal preparation plant sorts process, with
The raising of deterioration and the environmental requirement of raw coal coal quality, dense-medium separation ratio also will be higher and higher.
Dense media consumption is the main production cost of current coal preparation plant.The dense media of loss can aggravate equipment attrition simultaneously,
Influence production system；Dense media also will increase content of ashes in coal selecting product, reduce product calorific value, therefore how further to mention
The rate of recovery of high dense media reduces the important content that loss is current coal preparation technology development and cost efficiency.
The core of existing dense media recovery process theory is that magnetic separator once recycles whole dense media, and magnetic separation link is taken into account de-
Mud and dielectric film filter.But in actual job, requirement to process conditions and device parameter of desliming and dielectric film filter is simultaneously non-uniform.
Desliming requirement improves sharpness of separation and needs relatively low magnetic field strength, and dielectric film filter requires raising recycling ability needs relatively high
Magnetic field strength, while the two also has certain difference in terms of in other conditions such as concentration, magnetic separator.
Existing dense media recycling mainly utilizes the magnetic contrast of dense media and coal slime, and there is also bright for dense media and coal slime
Aobvious density variation such as can increase coal slime and the operation of dense media Gravity separation, on the one hand can be by a part of qualified medium as early as possible
On the other hand recycling can also be substantially reduced the pressure of magnetic separation link recycling.
There are also techniques to propose that directly magnetic separation recovery link, magnetic separator are still mainly adopted again for increase magnetic tailing or tail coal mud
With low field strength, but losing the dense media in tailing is mainly microfine and weak magnetic, therefore single uses weak magnetic field strength
Degree is difficult to recycle.
It must be appreciated that the property of dense media and heterogeneous, but different grain size size and magnetic strength magnetite ore particles
Mixture, therefore using single operation, rigid condition recycling by the way of efficiency it is to be improved.
Summary of the invention
It is mismatched and bring dense media time for recovery process existing for existing dielectric film filter link and dense media physical property
Yield is low, the high critical issue of the consumption that is situated between, and the present invention is to instruct theory with technique, equipment adaptation dense media physical property, provides
Dense media step strengthens the method for recycling in a kind of coal preparation technique.It mainly comprises the steps that
The step of raw coal is by screening, broken, dense medium separation；
Material after the sorting dense media after de-mediated, dehydration enters dielectric film filter process；
Preferably, it is shunted from qualified medium and the undersize material of dilute medium section collects into dilute medium bucket；
30%-80% material enters coal slime-dielectric separator in dilute medium bucket, once recycles magnetic material using reselecting method
Return to qualified medium bucket；
Unclassified stores enters weak magnetic separator and once recycles in dilute medium bucket；
Weak magnetic separator tailing and coal slime-dielectric separator overflow enter intensity magnetic separator secondary recovery；
Intensity magnetic separator concentrate is back to qualified medium bucket, and tailing enters slime water treatment process；
Coal slime-medium separate hydrocyclone underflow density is not less than 500g/l, and effluent concentration is not higher than 300g/l.
Preferably, weak magnetic separator is drum-type, magnetic field strength < 1800GS.
Preferably, intensity magnetic separator is magnetic disc type, magnetic field strength > 2500GS.
The utility model has the advantages that may be implemented since magnetite powder and coal slime have apparent density variation using cyclowass
The initial gross separation of coal slime and medium, but since underflow density and qualified medium difference are larger, of the invention to solve this problem
The dilute medium in part is subjected to Gravity separation, reduces magnetic separation link processing pressure；Magnetic separation recovery process is according to the non-linear of dense media
Physical property uses a weak magnetic and secondary strong magnetic integration of operation, guarantees the high efficiente callback of magnetic medium, forms gravity treatment and combine with magnetic separation,
Weak magnetic and the united step recovery process of strong magnetic.Dielectric loss significantly reduces, and easy to implement.
The method can effectively reduce the consumption of magnetite powder through the invention, economize on resources, to the wave of magnetic iron ore quality
Dynamic adaptability is good, in addition can reduce influence of the magnetite powder to product quality.
Detailed description of the invention
Fig. 1 is the method for the invention flow diagram；
Fig. 2 is process flowsheet of coal preparation in the prior art；
Fig. 3 is the method for the invention embodiment process flowsheet of coal preparation；
Figure label: A- sculping screen；B- qualified medium bucket；The dilute medium bucket of C-；D- qualified medium barrel pump；The dilute medium bucket of E-
Pump；F- coal slime-dielectric separator；G- weak magnetic separator；H- intensity magnetic separator.
Specific embodiment
In order to make the technology of the present invention method it should be readily understood that now in conjunction with attached drawing using specific example, to technical side of the invention
Case is described.It is to be noted that embodiment described herein is only section Example of the invention, and non-present invention is complete
Portion's implementation acts on and is only to provide the mode for understanding that the content of present invention is more simple and clear for auditor and the public, and
It is not the limitation to technical solution of the present invention.Without departing from the inventive concept of the premise, all ordinary skills
Personnel do not make creative work with regard to thinkable other embodiment, and the simple replacement of other pairs of technical solution of the present invention
And various change, belong to protection scope of the present invention.
The method of the invention is further described with reference to the accompanying drawing:
The invention includes that sculping screen sieves lower ore pulp collection link, coal slime-dielectric separator recovering medium link, weak magnetic separator
Recovering medium link and intensity magnetic separator secondary recovery medium link.
As shown in Figure 1, raw coal its oversize after desliming screen enters mixing tank, pumped to three products' dense-media matter eddy flow
Device is divided into cleaned coal, middle coal, spoil product.
Head coal product enters sculping screen A；
Sculping screen A leading portion sieve is lower to become qualified medium, and back segment sieve is lower to become dilute medium；
For qualified medium by being split into two strands, one enters qualified medium bucket B, the undersize material of another stock and dilute medium section
Collect into dilute medium bucket C；
30%-80% material enters coal slime-dielectric separator F in dilute medium bucket C, once recycles magnetism using reselecting method
Object returns to qualified medium bucket B；
Unclassified stores enters weak magnetic separator G and once recycles in dilute medium bucket C；
Weak magnetic separator G tailing and coal slime-dielectric separator F overflow enter intensity magnetic separator H secondary recovery；
Intensity magnetic separator H concentrate is back to qualified medium bucket B, and tailing enters slime water treatment process.
Qualified medium is squeezed into dense medium cyclone by qualified medium barrel pump D, and dilute medium barrel pump E squeezes into dilute medium bucket C material
Coal slime-dielectric separator F and weak magnetic separator G.
Attached drawing 2 is a typical process coal preparation flowsheet in the prior art
Granularity is down to 50mm by closed circuit crushing by raw coal, and raw coal its oversize after desliming screen enters mixing tank, warp
It is pumped to three products heavy medium cyclone and is divided into cleaned coal, middle coal, spoil product.Three products respectively enter respective de-mediated
Sieve.
Sculping screen leading portion is qualified medium section, sieves lower qualified medium a part and enters qualified medium bucket, in addition shunts gravity flow
Into dilute medium bucket.Back segment is dilute medium section, and dilute medium enters the dilute Jie's bucket of cleaned coal, dilute medium under middle coal, spoil sieve under cleaned coal sieve
It is combined into the dilute Jie's bucket of middle cash.
Sculping screen sieves upper cleaned coal, middle coal becomes final products after respectively enteing centrifuge dehydration, and spoil is expelled directly out on sieve.
Material is pumped up into mixing tank in qualified medium bucket, and the dilute medium of cleaned coal is pumped up into 2 diameter 1200mm cleaned coal magnetic
Machine recovering medium is selected, the dilute medium of middle coal, spoil is pumped into cash magnetic separator recovery medium in 2 diameter 1200mm.Magnetic separator magnetic field
Intensity is 1500GS, revolving speed 10r/min.
The gravity flow of magnetic separator concentrate returns to qualified medium bucket, and tailing gravity flow enters coal slime bucket.
Cleaned coal mud bucket material enters cyclone classification-separation of coarse slime-flotation-concentration-filters pressing recycling link.
Middle cash coal slime bucket material enters cyclone classification-concentration-filters pressing recycling link.
Attached drawing 3 is the method and process flow diagram that dense media step strengthens recycling in coal preparation technique.
In scheme of the present invention, 2 coal slime-dielectric separators and 2 strong magnetic are only increased newly on the basis of existing technology
Machine is selected, 50% material is shunted on existing cleaned coal magnetic separator pan feeding pipeline and directly feeds coal slime-dielectric separator, shunt volume can be with
Using valve regulated.
In scheme of the present invention, coal slime-dielectric separator underflow gravity flow enters qualified medium bucket, overflow and existing essence
Coal, middle cash magnetic separator tailings are flow automatically together feeds diameter 1200mm, 6 disk magnetic field strengths as 2600 intensity magnetic separator.
The gravity flow of intensity magnetic separator concentrate returns to qualified medium bucket, and tailing gravity flow enters coal slime bucket.
Magnet mineral content is 0.95-1.0g/l in prior art cleaned coal, middle cash magnetic separator tailings, after implementing the present invention program
0.8g/l can be reduced to hereinafter, mass production statistics indicate that magnetic tail loss typically constitute from the 60% of full coal preparation plant's dense media loss with
On, therefore prior art consumption reduction can be made to reduce by 20% or more using this programme.
Claims (4)
1. dense media step strengthens the method for recycling in a kind of coal preparation technique, which comprises the steps of:
Step 1: raw coal enters dielectric film filter process after dense medium sorts after de-mediated, dehydration；
Step 2: the qualified medium from dense medium separation link shunts and the dilute medium section undersize material of de-mediated collects into dilute Jie
Matter bucket；
Step 3: 30%-80% ore pulp enters coal slime-dielectric separator in dilute medium bucket, and coal slime-dielectric separator separates
Magnetic material and coal slime, magnetic material return to qualified medium bucket, and coal slime enters intensity magnetic separator；Another part ore pulp enters weak magnetic separator,
Weak magnetic separator separates magnetic material and coal slime, and magnetic material returns to qualified medium bucket, and coal slime enters intensity magnetic separator；Coal slime-the medium
Separator underflow density is not less than 500g/l, and effluent concentration is not higher than 300g/l；
Step 4: the intensity magnetic separator separates magnetic material and coal slime, and magnetic material returns to qualified medium bucket, and coal slime enters subsequent coal slime
Water process link.
2. dense media step strengthens the method for recycling in a kind of coal preparation technique according to claim 1, which is characterized in that institute
Stating coal slime-dielectric separator type is classifying cyclone or cyclowass.
3. dense media step strengthens the method for recycling in a kind of coal preparation technique according to claim 1, which is characterized in that institute
Stating weak magnetic separator is drum-type, magnetic field strength < 1800GS.
4. dense media step strengthens the method for recycling in a kind of coal preparation technique according to claim 1, which is characterized in that institute
Stating intensity magnetic separator is magnetic disc type, magnetic field strength > 2500GS.
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| CN201811156846.9A CN109174439B (en) | 2018-09-30 | 2018-09-30 | Dense media step strengthens the method for recycling in a kind of coal preparation technique |
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| CN201811156846.9A CN109174439B (en) | 2018-09-30 | 2018-09-30 | Dense media step strengthens the method for recycling in a kind of coal preparation technique |
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| CN109174439B true CN109174439B (en) | 2019-11-05 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109701729B (en) * | 2019-01-14 | 2020-11-17 | 乌拉特中旗毅腾矿业有限责任公司 | Clean utilization production process for middlings |
| CN111135633B (en) * | 2020-03-10 | 2023-09-22 | 威海市海王科技有限公司 | Ferrosilicon powder recycling treatment system and treatment process |
| CN112138856B (en) * | 2020-08-13 | 2022-04-12 | 中国矿业大学 | All-magnetic separation process for gangue-combined media in easily-argillized power coal |
| CN112156885B (en) * | 2020-08-17 | 2021-11-30 | 中国矿业大学 | Process for recycling coarse slime in qualified medium |
| CN113019679B (en) * | 2021-03-17 | 2022-11-25 | 神华神东煤炭集团有限责任公司 | Method and system for coal dense medium cyclone separation for liquefaction |
| CN115400870A (en) * | 2022-08-01 | 2022-11-29 | 中煤西安设计工程有限责任公司 | Concentration-magnetic separation combined coal preparation plant medium recovery process |
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| CN102489384A (en) * | 2011-12-07 | 2012-06-13 | 河南焦煤能源有限公司 | Integrally designed two-product dense medium separation process |
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