CN105709941A - Flotation technology for wide-size coal slime - Google Patents
Flotation technology for wide-size coal slime Download PDFInfo
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- CN105709941A CN105709941A CN201610224983.6A CN201610224983A CN105709941A CN 105709941 A CN105709941 A CN 105709941A CN 201610224983 A CN201610224983 A CN 201610224983A CN 105709941 A CN105709941 A CN 105709941A
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- flotation
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- coal
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- 238000005188 flotation Methods 0.000 title claims abstract description 80
- 239000003245 coal Substances 0.000 title claims abstract description 61
- 238000005516 engineering process Methods 0.000 title abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 13
- 238000007667 floating Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 230000002209 hydrophobic effect Effects 0.000 claims description 7
- 239000007921 spray Substances 0.000 claims description 7
- 239000003250 coal slurry Substances 0.000 claims description 6
- 239000004088 foaming agent Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002283 diesel fuel Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 239000008187 granular material Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 239000002956 ash Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 210000000867 larynx Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 230000000007 visual effect Effects 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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
-
- 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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/001—Flotation agents
- B03D1/004—Organic compounds
- B03D1/006—Hydrocarbons
-
- 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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
-
- 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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
-
- 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
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
- B03D2203/08—Coal ores, fly ash or soot
Abstract
The invention discloses a flotation technology for wide-size coal slime. The flotation technology comprises the ore pulp preparation work, the high-pressure jetting work, the bubble removal work and the flotation work in a teetered bed-self-circulation flotation column; the bubble removal technology is added after a self-absorption micro-bubble generator, non-active bubbles are removed through the bubble removal work, the phenomenon that excessive bubbles enter the teetered bed-self-circulation flotation column and form an ultra-thick bubble layer is avoided, the influence of the non-active bubbles on subsequent sorting is eliminated, appropriate common bubbles are generated through a bubble generator of the teetered bed-self-circulation flotation column according to needs, the common bubbles and active micro-bubbles are adjusted for realizing the appropriate proportion by controlling the consumption of bubble forming agents, and therefore the floatation efficiency can be improved to the maximum degree.
Description
Technical field
The present invention relates to coal slime flotation technical field, particularly relate to a kind of wide grade coal slime floating process.
Background technology
Flotation at present is that coal slime carries out the main method that sorting is reclaimed, and it is according to coal and spoil moistened surface
Property difference, under the effect of floating agent, reclaim the cleaned coal in coal slime.But, owing to coarse grain adheres to gas
After bubble, big and traditional mechanical agitation type flotation machine the turbulent environment of height of peel force, causes the flotation effect of coarse grain
The best, the upper limit is usually no more than 0.5mm.In order to solve the sorting problem of coarse slime, improve coal slime flotation granularity
The upper limit, must be substantially reduced flotation efficiency, under conditions of both wanting to improve upper limit guaranteed efficiency again, the most only
Coal slime can first carry out classification, and coarse slime enters gravity separation technology (such as spiral chute, TBS, cyclone etc.),
Fine coal slurry enters floatation process, forms weight-floating process integration and processes coal slime, causes slime separation technique
Complexity, process procedure is more, adds production and management cost.
Applicant once applied for a kind of interference bed-self-loopa flotation column (publication number CN203044172U), should
Flotation column is by introducing upper up-flow so that ore particle is by an active force upwards, and covert reduces bubble
Drag to ore particle, thus reduce the desorption probability of bubble and ore particle, sorting upper size boundary can improve to
1.5-2mm, has effectively widened the particle size range of flotation.But applicant applies this flotation unit process in reality
Middle discovery, the bubble-ore particle polymer formed in interference bed, depart from interference bed, float up to froth bed
During, more careless particle water falls off phenomenon, and this explanation is in interference bed, by more careless water
The bridging effect of granule can form bubble-ore particle polymer, but polymer insecure, say, that as
Fruit can strengthen the polymeric firmness of bubble-ore particle, it is possible to improves flotation upper size boundary further.
Occur in that a kind of self-suction microbubble generator in the market, it be by nozzle, air chamber, trunnion and
Anemostat forms, and is currently used primarily in flotation column.Self-suction microbubble generator is formed by high-pressure spray
Active air bubble, has the character preferentially separated out on hydrophobic solid surface, thus, the most hydrophobic coal slime surface
Active air bubble will be separated out；Owing to having bigger attachment contact area, coal slime granule is by active air bubble and general
The attachment of ventilation bubble is direct more firm with common blister attachment than granule, say, that if can be by surface
The hydrophobic granule of active microvesicle feeds interference bed-self-loopa flotation column, is beneficial to improve bubble-ore deposit
The polymeric firmness of grain, thus improve flotation upper size boundary further.
Summary of the invention
Flotation grade in order to overcome existing coal slime floating process to exist is narrow, upper size boundary is low, complex process with
And the technological deficiency that flotation upper size boundary and flotation efficiency can not be taken into account simultaneously, the present invention provides a kind of wide grade
Coal slime floating process.
For reaching above-mentioned purpose, the present invention adopts the technical scheme that:
A kind of wide grade coal slime floating process, is made by ore pulp preparation, high-pressure spray, froth breaking and flotation four part
Industry forms, and specifically comprises the following steps that
The first step: ore pulp preparation work
Use agitator to carry out ore pulp preparation work, enter float coal mud and enter agitator, be simultaneously introduced coal slime flotation
Collecting agent (hydrocarbon ils such as kerosene, diesel oil), enters float coal mud and fully acts on flotation collector through ore pulp preparation work
After, realize collecting agent dispersion in ore pulp by stirring, enhance the hydrophobicity on coal slime surface；
The addition of collecting agent preferably 0.5～5kg/t delivering dry coal slurry, preferably 1～3 minute stirring and evenly mixing time；
Second step: high-pressure spray operation
Ore pulp after stirring and evenly mixing feeds self-priming microbubble generator by pumping, and ore pulp is from self-priming microvesicle
After generating means, form the surface strong hydrophobic coal slime with active air bubble；
Said pump pressurization pressure is preferably 0.05～0.3MPa.
3rd step: froth breaking operation
The ore pulp discharged by microvesicle generators enters froth breaking agitator, it is ensured that the mixing time of more than 2 minutes,
By stirring action, the nonactive microvesicle in ore pulp is eliminated, it is achieved froth breaking；
4th step: carry out flotation in interference bed-self-loopa flotation column
Ore pulp after froth breaking feeds interference bed-self-loopa flotation column, by interference bed-self-loopa flotation column
Bubble generator add foaming agent, obtained cleaned coal and tail coal respectively by flotation, frother dosages with catch
The ratio receiving agent consumption is 0.05～0.1, determines frother dosages according to ature of coal character in actual application.
The grading principle of the present invention is:
First, enter float coal mud after ore pulp preparation work and flotation collector fully act on, enhance coal slime table
The hydrophobicity in face；Then, the ore pulp high pressure after stirring and evenly mixing feeds self-suction microbubble generator, and self-priming declines
Bubble generator is made up of nozzle, air chamber, trunnion and anemostat, and ore pulp sprays from nozzle at high speeds, enters larynx
Pipe, high-speed jet makes air chamber produce negative pressure, thus by outside from sucking air, in trunnion air-liquid,
Gu three-phase is vigorously mixed, portion of air is ground into bubble, and solid particle generation mineralization, another
Partial air dissolves in ore pulp due to high pressure；When ore pulp enters anemostat, and pressure reduces suddenly, in trunnion
The air dissolving in ore pulp reduces with pressure and again separates out, and becomes a kind of active microvesicle, and activity is micro-
Bubble has the character preferentially separated out on hydrophobic solid surface, thus, precipitation is lived by the most hydrophobic coal slime surface
Property microvesicle；The ore pulp discharged by microvesicle generators enters froth breaking agitator, due to the active air bubble of the surface of solids
Once precipitation, in the case of pressure is constant, it is difficult to be destroyed, therefore, is by ore deposit by stirring action one
Nonactive microvesicle in slurry eliminates, and two is to avoid too much bubble to enter interference bed-self-loopa flotation column to be formed
Thick froth bed, is unfavorable for the flotation of coarse grain coal slime.The coal slime granule of the active microvesicle in surface is highly beneficial
In interference bed-self-loopa flotation column in formed bubble-ore particle polymer, will further improve interference bed-
The flotation upper size boundary of self-loopa flotation column, thus realize wide grade flotation.
The positive effect of the present invention is:
1, needing to introduce bubble due to coarse slime flotation, Flotation Mechanism is: the bubble of introducing and mineral formation gas
Bubble-ore particle polymer so that ore particle is by an active force upwards, and covert reduces bubble to ore particle
Drag, thus reduce the desorption probability of bubble and ore particle, improve sorting upper size boundary, effectively widen
The particle size range of flotation.Suffering from this, those skilled in the art are mistakenly considered to want just to improve sorting upper size boundary
Must be introduced into substantial amounts of bubble, hardly realize, before raw material feeds interference bed-self-loopa flotation column, utilize
Self-suction microbubble generator, not only forms active air bubble, also can produce a large amount of nonactive bubble simultaneously, activity
The introducing of bubble is helpful to improving sorting upper size boundary, and the introducing of a large amount of nonactive bubble is not the most helped
Help, and nonactive bubble feeds interference bed-self-loopa flotation column, it will produce thicker in flotation column
Froth bed, froth bed is the thickest, and secondary enrichment more easily causes coarse granule and comes off, and affects head coal product quality,
With coal productivity, this results in can not take into account at this area flotation upper size boundary and flotation efficiency simultaneously.The present invention
By increasing de-foaming process after self-suction microbubble generator, remove nonactive bubble by froth breaking operation,
Avoid too much bubble to enter interference bed-self-loopa flotation column and form blocked up froth bed, eliminate nonactive bubble
Impact on follow-up separation, introduces suitable by the bubble generator of interference bed-self-loopa flotation column as required
Suitable common blister, the consumption controlling foaming agent adjusts the ratio that common blister and active air bubble reach suitable,
Thus improve flotation efficiency to the full extent.
2, the present invention improves again flotation upper size boundary, the froth breaking of increase on the premise of not reducing flotation efficiency
Technique need not any big equipment, simply stirs in agitator, easy realization the most simple to operate,
And less increase cost, relative to existing heavy-floating associating slime separation technique, decrease technological operation
Link, reduces production and management cost；Relative to existing interference bed-self-loopa flotation column, flotation grain
The degree upper limit is greatly improved, and compared with tradition coal slime floating process, the present invention is ensureing that floatation clean coal ash is basic
On the premise of constant, flotation upper size boundary can reach 5-6mm, and floatation clean coal productivity also will improve therewith, and take
Obtain beyond thought effect, possess the creativeness of Patent Law the 3rd section of the 22nd article regulation.
Detailed description of the invention
Technical scheme is further illustrated below in conjunction with specific embodiment.
Certain Oversized Coking Coal Cleaning Plant coal slime ash is 26.11%, and maximum particle size is 6-7mm, and granularmetric composition is shown in Table 1.
Coal slime being fed agitator of sizing mixing, is simultaneously introduced collecting agent (diesel oil) and sizes mixing, collector dosage is 1.5
Kg/t delivering dry coal slurry, mixing time is 3 minutes；Ore pulp after stirring and evenly mixing passes through high-pressure spray pump with 0.25Mpa
Pressure feed self-priming microbubble generator, microvesicle generators the ore pulp discharged enters froth breaking agitator,
Stir 2 minutes froth breakings；Ore pulp after froth breaking feeds interference bed-self-loopa flotation column, by interference bed-
The bubble generator of self-loopa flotation column adds foaming agent (No. 2 oil), and frother dosages is that 0.1kg/t does
Coal slime, obtains cleaned coal and tail coal after sorting, separation index is shown in Table 1.For the ease of comparing, directly use tradition
Flotation device and interference bed-self-loopa flotation column have carried out flotation respectively to this coal slime, optimal collector dosage and
Frother dosages is respectively 1.5kg/t delivering dry coal slurry and 0.15kg/t delivering dry coal slurry, and separation results is also found in table 2.
For the sorting upper size boundary of three kinds of flotation modes of direct visual comparison, the flotation that three kinds of flotation modes are obtained essence
The granularmetric composition of coal is listed in table 3.
From table 2 it can be seen that use present invention process that this coal slime is sorted, it is possible to obtain clean coal yield
72.14%, cleans ash 9.12%, the separation index of combustible recovery 88.73%；And directly use tradition
This coal slime is sorted by flotation device and interference bed-self-loopa flotation column, although be obtained in that suitable cleaned coal
Ash, but clean coal yield is far below present invention process.From table 3 it is apparent that tradition flotation device flotation
Upper size boundary is 0.5-1mm, and the sorting upper size boundary of interference bed-self-loopa flotation column is 2-3mm, and this
The sorting upper limit can be improved to about 6mm by invented technology, significantly improves the recovering effect of coarse fraction coal slime,
So that the overall separating effect of present invention process embodies the most excellent compared to tradition floatation process equipment
Gesture.
Therefore, present invention process is when sorting coal slime, compared with tradition floatation process equipment, and can be
On the premise of ensureing head coal product quality, it is greatly improved the sorting upper limit, it is thus achieved that higher clean coal yield, simplifies
Slime separation technique, is effectively improved flotation efficiency.
Table 1 slime size forms
| Grade/mm | Productivity/% | Accumulation/% on sieve | Lower accumulation/the % of sieve |
| -7+6 | 1.99 | 1.99 | 100.00 |
| -6+3 | 12.23 | 14.22 | 98.01 |
| -3+2 | 20.04 | 34.26 | 85.78 |
| -2+1 | 21.63 | 55.89 | 65.74 |
| -1+0.5 | 20.77 | 76.67 | 44.11 |
| -0.5+0.3 | 8.27 | 84.93 | 23.33 |
| -0.3+0.15 | 6.85 | 91.78 | 15.07 |
| -0.15+0.074 | 4.90 | 96.68 | 8.22 |
| -0.074 | 3.32 | 100.00 | 3.32 |
| Add up to | 100.00 | - | - |
Table 2 flotation experimental results
| Technique | Clean coal yield/% | Cleans ash/% | Combustible recovery/% |
| Present invention process | 72.14 | 9.12 | 88.73 |
| Interference bed-self-loopa flotation column | 56.97 | 9.09 | 70.09 |
| Flotation device | 17.42 | 9.14 | 21.42 |
Table 3 floatation clean coal granularmetric composition
Claims (2)
1. one kind wide grade coal slime floating process, it is characterised in that it be by ore pulp preparation, high-pressure spray,
Froth breaking and flotation four Partial Jobs composition, specifically comprise the following steps that
The first step: ore pulp preparation work
Use agitator to carry out ore pulp preparation work, enter float coal mud and enter agitator, be simultaneously introduced coal slime flotation
Collecting agent (hydrocarbon ils such as kerosene, diesel oil), enters float coal mud and fully acts on flotation collector through ore pulp preparation work
After, realize collecting agent dispersion in ore pulp by stirring, enhance the hydrophobicity on coal slime surface；
(2) high-pressure spray operation
Ore pulp after stirring and evenly mixing feeds self-priming microbubble generator by pumping, and ore pulp is from self-priming microvesicle
After generating means, form the surface strong hydrophobic coal slime with active air bubble；
(3) froth breaking operation
The ore pulp discharged by microvesicle generators enters froth breaking agitator, it is ensured that the mixing time of more than 2 minutes,
By stirring action, the nonactive microvesicle in ore pulp is eliminated, it is achieved froth breaking；
(4) in interference bed-self-loopa flotation column, flotation is carried out
Ore pulp after froth breaking feeds interference bed-self-loopa flotation column, by interference bed-self-loopa flotation column
Bubble generator add foaming agent, obtained cleaned coal and tail coal respectively by flotation.
2. wide grade coal slime floating process as claimed in claim 1, it is characterised in that
In the first step, the addition of described collecting agent is 0.5～5kg/t delivering dry coal slurry, the stirring and evenly mixing time
It it is 1～3 minute；
In second step, pumping pressure is 0.05～0.3MPa；
In 4th step, frother dosages is 0.05～0.1 with the ratio of collector dosage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610224983.6A CN105709941B (en) | 2016-04-12 | 2016-04-12 | A kind of width grade coal slime floating process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610224983.6A CN105709941B (en) | 2016-04-12 | 2016-04-12 | A kind of width grade coal slime floating process |
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| Publication Number | Publication Date |
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| CN105709941A true CN105709941A (en) | 2016-06-29 |
| CN105709941B CN105709941B (en) | 2018-06-15 |
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| CN201610224983.6A Expired - Fee Related CN105709941B (en) | 2016-04-12 | 2016-04-12 | A kind of width grade coal slime floating process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109759241A (en) * | 2019-01-31 | 2019-05-17 | 中国矿业大学 | A kind of device and method of width particle size fraction coal slime flotation |
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| CN203044172U (en) * | 2013-01-25 | 2013-07-10 | 山东科技大学 | Interference bed self-circulation flotation column |
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| CN203565186U (en) * | 2013-07-05 | 2014-04-30 | 安徽理工大学 | Microbubble impulsive motion liquid-solid fluidized bed coarse coal slime sorting machine |
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2016
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| CN101306398A (en) * | 2007-05-15 | 2008-11-19 | 上海大屯能源股份有限公司 | Microbubble swirl separation method and divice |
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| CN109759241B (en) * | 2019-01-31 | 2019-11-29 | 中国矿业大学 | A kind of device and method of width particle size fraction coal slime flotation |
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| Publication number | Publication date |
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| CN105709941B (en) | 2018-06-15 |
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