CN101015820A - Floatation method of difficult-to-float coal - Google Patents
Floatation method of difficult-to-float coal Download PDFInfo
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Abstract
The invention provides a method for floating selecting coal mud, which combines surface modifier and micro foam floating selector, to select multiple coals and sink coals, to improve quality and accuracy, wherein the drug consumption (catcher and foaming agent) is reduced 20% and the floating extracting rate is improved more than 10%.
Description
Technical field
The present invention relates to a kind of coal separation method, specifically, relate to a kind of floatation method of difficult-to-float coal.
Background technology
In general, the coal preparation method of coal mainly contains gravity separation and two kinds of the sortings of swimming, and (sorting 0.5mm) adopts the coal floatation method to reclaim usually to the fine grained mineral in the world at present.The Bed for Fine Coal that-0.5mm is following is difficult to adopt reselecting method to separate recovery because its surface area and mass ratio are relatively large, and large-scale industrial production can only adopt the method for flotation to reclaim.
Press heavily the be situated between maturation of cyclone of three products and use along with large-scale nothing, the gravity concentration technology steps and steps on a new stage, and the sorting technology of the Bed for Fine Coal progress of not making a breakthrough property as yet.
The Bed for Fine Coal sorting technology is the raising along with the mining mechanization degree, and coal amount increases considerably and corresponding growing up, and the research to the Bed for Fine Coal sorting has both at home and abroad had outstanding progress.For example, adopt to be limited to zero under the dual medium cyclone dressing, U.S.'s microbubble floatation column newly developed can obtain ash content less than 3%, sulphur content is less than 0.5% cleaned coal; It is 0.9%～1.2% cleaned coal that static flotation pipe can obtain ash content.For-0.5mm slime separation multiple technologies are arranged, but from maturity, economic serviceability and the separating effect of sorting technology in general, the coal floatation technology remains the optimal selection of present Bed for Fine Coal method for separating.Current, domestic and international most of scientific research institution focuses on above the development of new type flotation machine, the world developed country such as the U.S., Canada, Australia, Germany etc. are to the novel mechanical agitation type flotation machine and do not have mechanical agitated flotation cell and carried out a large amount of development tests, as inflatable, air pressing type, air self-suction formula, flotation column, air self-suction formula flotation device etc.China has developed jetstream whirl flotation device, flotation column, cyclone flotation bed, micro-bubble flotation machine from the nineties, and these floatation equipments in each coal preparation plant's extensive use of the whole nation, have improved flotation efficiency effectively.
China is a coal production and consumption big country, but present coal selective ratio of China and comprehensive utilization of resources rate are all lower.Particularly abominable for some down-hole occurrence conditions, ature of coal changes frequent coking coal and lean coal, because of it contains a large amount of argillization shale, the coal slime floatability of-0.5mm level is poor, all belong to utmost point difficult-to-float coal, as adopt original common floatation process, effect is undesirable, and clean coal recovery is low, and the floating agent consumption is big.
Therefore, need further study, can not wash qualified cleaned coal, problem that productive rate is low with solution to the floatation process of the difficult-to-float coal of floatability difference.
Summary of the invention
The purpose of this invention is to provide a kind of floatation method of difficult-to-float coal, start with, surface property modifier and microfoam flotation device are united use, solve difficult-to-float coal and can not wash qualified cleaned coal, problem that productive rate is low from preliminary treatment and two links of flotation of difficult-to-float coal.
In order to realize the object of the invention, a kind of floatation method of difficult-to-float coal of the present invention, it comprises the steps:
1) surfaction: will add the collecting agent of 0.8～1.2kg in the difficult-to-float coal aqueous mixtures of granularity per ton less than 0.5mm earlier, and injection surface property modifier, the rotating speed of control surface modifying machine is 100～200rpm, and feed pressure 0.1～0.3MPa handled 60～90 seconds;
2) microfoam flotation: and then add in the micro-bubble flotation machine with foaming agent, cleaned coal in the difficult-to-float coal and coal slime are separated, wherein, the addition of foaming agent is to add 0.1～0.3kg in the difficult-to-float coal aqueous mixtures per ton, and micro-bubble flotation machine air pressure is controlled at 0.1～0.4MPa.
The concentration of described difficult-to-float coal aqueous mixtures is 60～140g/l.
Microfoam flotation of the present invention can adopt one to twice microfoam flotation to handle.Just, described microfoam flotation is handled and is adopted two micro-bubble flotation machine serial or parallel connections to carry out.
The present invention preferably adopts surfaction and the technological process of two sections microvesicle direct flotations.Specifically, the black water mixture enters surface property modifier with collecting agent from the coal slurry of cylindricality master staving inlet, coal grain in the black water and collecting agent carry out step by step dispersion through crooked Scroll-type agitator arm, mix, clean, shear and stir, after finishing coal surface modification under the high speed shear force field of surface property modifier, discharge from the coal slurry outlet of surface property modifier, enter one section micro-bubble flotation machine then, one section mine tailing enters two sections micro-bubble flotation machines, one, the concentrate merga pass of two sections micro-bubble flotation machines floats smart dehydration equipment (pressing filter or disc vacuum filter) dehydration to be become floating smart product and mixes cleaned coal, two sections mine tailings enter that thickener concentrates after the diaphragm filter press dehydration becomes coal slime, and filter filtrate is returned floatation system and further reclaimed.In floatation process, flotation pulp can be controlled internal circulating load automatically by the inner core circulation pipe of micro-bubble flotation machine.Two sections series connection direct flotation technologies can make coal slime get to the limit and reclaim.Liquid level, flotation pulp internal circulating load are controlled automatically simultaneously, and coal slime is fully reclaimed.Floating finishing pressing filtering liquid returns, and has avoided the loss of cleaned coal and medicament.The stage agent addition system guarantees best flotation effect.
Collecting agent of the present invention is kerosene, light diesel fuel, shale light diesel fuel or MB series flotation agent etc., is good with kerosene.
Described foaming agent is natural foaming agent (pine tar, No. 2 oil, camphorated oil, folium eucalypti wet goods), industry byproduct foaming agent (GF flotation agent, secondary octanol, fusel etc.), artificial synthetic foaming agent (ether frother, ether alcohol class foaming agent), wherein, be good with the industry byproduct foaming agent.
At reagent consumption amount 1.0～1.4kg/t (dry coal mud per ton), collecting agent and foaming agent ratio 5: 1～10: 1 o'clock, coal slime all can obtain good flotation effect.
It generally is made up of the used surface property modifier of the present invention stirring cylinder, main shaft, agitator arm, dividing plate, motor, decelerator etc.Be characterized in that the surface property modifier main body is horizontal cylindrical structural, and the multistage structure of separating with a plurality of dividing plates, the staving center arrangement has shaft, dispose crooked Scroll-type agitator arm on the axle, place each section tank diameter respectively, in two sections the dividing plate, be provided with radial cylinder manifold forwardly for the material that can evenly stir coal, water and wet goods different densities.
Under the mechanism support of " fluid force chemistry " effect, surface property modifier belongs to a kind of new and effective Fine Coal Flotation pre-processing device (kaskad apparatus for pre-flotation pulp conditioning or the device of sizing mixing).Granularity less than the Bed for Fine Coal of 0.5mm after this device processes, the emulsification, physical chemistry, reunion, activation and the homogeneous effect that take place make coal grain surface more hydrophobic, widened surface nature difference with the high grey mineral matter of shale such as spoil, improved the hydrophobicity and the floatability of coal, accelerated flotation speed and improved the floatation clean coal productive rate.
In general, the high strength shearing force in the surface property modifier front end short time (10～15 seconds) can make collecting agent realize ultra-fine dispersion--emulsification rapidly, can save collector dosage more than 20%.Meanwhile, in the higher shear power of surface property modifier front end short time and follow-up flow field under the effect of local higher shear power, can make and stick to the low lip-deep high plaster pledge of culm grain and peel off, the coal grain of former hydrophobicity difference is exposed fresh coal surface--activation, thereby improved the hydrophobicity and the floatability of coal.
The geometry feature of surface property modifier has guaranteed rational hydrodynamic shear size and Flow Field Distribution, under reasonably Flow Field Distribution (bucket formula secondary Flow Field Distribution) and shearing force size act on, collecting agent more effectively " is contacted " with the coal grain--physics chemical action takes place, thereby has improved the hydrophobicity and the floatability of coal; The fine coal grain (＜300 orders approximately) that hydrophobicity is strengthened is reunited, and forms bigger polymerization " particle " (50～100 μ m)--the agglomeration of size, makes difficult floating subparticle also can obtain good flotation effect.
Surface property modifier adopts the special structure form of horizontal layout of cylindrical multistage and swept-back flexible blade, the relative high speed rotation (linear velocity of quick runner rotor outer end＞16m/s) can produce very high shear stress and high frequency mechanical effect between impeller and dividing plate, bring powerful shearing kinetic energy (energy that it imports medium is more than 1000 times of common stirring) to ore pulp, the inferior fluid power of material moment generation hundreds of thousands of different nature is sheared, the liquid layer friction, collision, with comprehensive functions such as centrifugal extruding, make solid-liquid phase (coal immiscible and that nature difference is big, spoil, with water), liquid-liquid phase (water and oil), Gu-solid phase (coal, spoil) etc. produce emulsification between heterogeneous, physical chemistry, reunite, multiple comprehensive effects such as activation, thereby can in 60～90 seconds, make nearly all coal particle obtain effective upgrading, and accelerate flotation speed.
Micro-bubble flotation machine of the present invention can adopt micro-bubble flotation machine well-known to those skilled in the art.It generally comprises compositions such as cell body, slag stock pump, sorting groove body, inner barrel, pulp distributer, mineralizer, mineralising pipe, perflectometer, concentrate feeder, mine tailing regulating box, by-pass valve control.Ore pulp (coal slime slurry) is extracted out from the ore pulp bucket by dreg slurry pump and is pumped into pulp distributer, and uniform distribution is to the mineralization unit of each group mineralizer, via mineralizer, mineralising pipe then, and the nozzle from perflectometer sprays at last.The operating pressure of mineralizer is 0.2～0.4MPa.When ore pulp from distributor when mineralizer enters the mineralising pipe, because the special construction of mineralizer, ore pulp becomes spurting to inject the mineralising pipe, thereby formation negative pressure, air is inhaled into mineralising Guan Bingyu ore pulp and fully contacts, shears, collides, make the abundant mineralising of ore pulp, when ore pulp arrived bottom reflection, the flotation cell internal pressure was zero substantially.Because pressure die-offs, the bubble that dissolves in the ore pulp is separated out rapidly, is grown up, and is being with the coal grain to float to overflow to flotation bucket surface along periphery to enter the concentrate feeder; Mine tailing then enters the mine tailing case from the bottom by the U-shaped pipe and discharges, and the mine tailing case plays a part to regulate liquid level with the U-shaped pipe, with the control flotation effect.
Foaming agent adds before the ore pulp barrel pump, the ore pulp that has foaming agent is under the running up of slag stock pump, make foaming agent and ore pulp obtain to a certain degree mineralising, ore pulp is got by the slag stock pump, after entering pipeline, speed is more than 1.2m/s, because the proportion difference of solid-liquid, make coal grain and foaming agent fully collide and shear, make the further mineralising of ore pulp.
Floatation method of difficult-to-float coal of the present invention adopts surface property modifier and micro-bubble flotation machine to unite use, for difficult float coal, go into to float many coals and floatability and change under the big condition, selectivity and flotation effect can both effectively be guaranteed, solve difficult-to-float coal and can not wash qualified floating smart product, the floating low difficult problem of smart productive rate, because the two mechanism of action has the part similarity, after the associating use, guaranteeing on the ash content basis, medicament (collecting agent and foaming agent) unit consumption reduces by 20%, and floating smart sucrose extraction improves more than 10%.
The present invention at first carries out preliminary treatment with surface property modifier to coal slime, emulsification, physical chemistry, reunion, activation and homogeneous effect take place, make coal grain surface more hydrophobic, widened the surface nature difference of the high grey mineral matter of shales such as coal and spoil, compare with common ore pulp preprocessor, better improved the hydrophobicity and the floatability of coal.Accelerate flotation speed, improved the floatation clean coal productive rate; Simultaneously, select for use micro-bubble flotation machine, compare, have the sharpness of separation height, the unit volume treating capacity is big, the characteristics that electrical energy consumption per tonne of raw coal is low with traditional mechanical type flotation device as floatation equipment.
Use technology of the present invention flexible,, can adopt the floating again or bis flotation flow process of floating essence, to reach maximizing the benefits at coal slime of different nature.The present invention simultaneously to mediumly float, difficult floating, utmost point difficult-to-float coal all has good effect.
Description of drawings
Fig. 1 is a floatation method of difficult-to-float coal general flow chart of the present invention.
The specific embodiment
Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
Present embodiment adopts surfaction and the technological process of two sections microvesicle direct flotations.Technological process as shown in Figure 1.
At first granularity is less than the black water mixture (concentration is 120g/l) of 0.5mm, and (Changsha is opened Science and Technology Ltd. and produced, disposal ability 1000m to enter surface property modifier with collecting agent kerosene from the coal slurry inlet of cylindricality master staving
3/ h, feed pressure 0.1MPa), the addition of kerosene is a 0.95g/l coal slime mixture, the surface property modifier rotating speed is 157rpm, coal grain in the black water and collecting agent through crooked Scroll-type agitator arm carry out step by step dispersion, mix, scouring, shearing and stirring, under the high speed shear force field of surface property modifier, handled 90 seconds, after finishing coal surface modification, discharge from the coal slurry outlet of surface property modifier.
Add foaming agent then, addition is to add 0.12kg in the difficult-to-float coal aqueous mixtures per ton, enter one section WPF-Z5000 micro-bubble flotation machine (Changsha is opened Science and Technology Ltd. and produced), air pressure is controlled at 0.3MPa, one section mine tailing enters two sections micro-bubble flotation machines, one, the dehydration of two sections concentrate merga pass filters becomes floating smart product and mixes cleaned coal, and two sections mine tailings enter that thickener concentrates after the filter press dehydration becomes coal slime.Filter filtrate is returned floatation system and is further reclaimed, the recovery that can circulate of one, two sections part flotation pulps of flotation device.Two sections series connection direct flotation technologies can make coal slime get to the limit and reclaim.Liquid level, mine tailing internal circulating load are controlled automatically simultaneously, and coal slime is fully reclaimed.Floating finishing pressing filtering liquid returns, and has avoided the loss of cleaned coal and medicament.The stage agent addition system guarantees best flotation effect.
WPF-Z5000 micro-bubble flotation machine (parameter: motor power (output): 200Kw, mineralizer operating pressure: 0.2～0.4MPa, treating capacity during the ore pulp platform: 600～800m
3/ h, dry coal mud treating capacity: 50～80t/h, cylindrical shell volume: 76m
3) form by ore pulp bucket, slag stock pump, sorting groove body, inner barrel, pulp distributer, mineralizer, mineralising pipe, perflectometer, concentrate feeder, mine tailing regulating box, by-pass valve control etc.Its course of work is: the coal slime slurry is extracted out from the ore pulp bucket by dreg slurry pump and is pumped into pulp distributer, and uniform distribution is to the mineralization unit of each group mineralizer, via mineralizer, mineralising pipe then, and the nozzle from perflectometer sprays at last.When ore pulp from distributor when mineralizer enters the mineralising pipe, because the special construction of mineralizer, ore pulp becomes spurting to inject the mineralising pipe, thereby formation negative pressure, air is inhaled into mineralising Guan Bingyu ore pulp and fully contacts, shears, collides, make the abundant mineralising of ore pulp, when ore pulp arrived bottom reflection, the flotation cell internal pressure was zero substantially.Because pressure die-offs, the bubble that dissolves in the ore pulp is separated out rapidly, is grown up, and is being with the coal grain to float to overflow to flotation bucket surface along periphery to enter the concentrate feeder.
Embodiment 2
Basic process is with embodiment 1, and different is that present embodiment adopts surfaction and the technological process of one section microvesicle direct flotation.
Add collecting agent light diesel fuel 0.8kg in the difficult-to-float coal aqueous mixtures per ton (concentration is 140g/l), GF flotation agent 0.16kg.
The feed pressure 0.2MPa of surface property modifier, rotating speed are 200rpm, handle 60 seconds.
Micro-bubble flotation machine air pressure is controlled at 0.1MPa.
Embodiment 3
Basic process is with embodiment 1, and different is to add collecting agent kerosene 1.0kg in the difficult-to-float coal aqueous mixtures per ton (concentration is 140g/l), pine tar 0.1kg.
The feed pressure 0.3MPa of surface property modifier, rotating speed are 100rpm, handle 80 seconds.
Micro-bubble flotation machine air pressure is controlled at 0.4MPa.
Experimental example 1
To the east of bent ore deposit coal preparation plant be example, it is gone into operation in November, 1994 for being designed into the mine type coal preparation plant of 4,000,000 tons of the abilities of washing year, going into to wash raw coal is eastern bent ore deposit 2#, 4#, 8# coal.By in October, 2002, eastern bent ore deposit high-quality 2# coal has been adopted, reaches one period from now at present, and coal preparation plant goes into to wash raw coal and is 4# coking coal and the 8# lean coal that the down-hole occurrence condition is abominable, the ature of coal variation is frequent.4# coal δ ± 0.1 content reaches more than 56%, belong to utmost point difficult separation coal, and contain a large amount of argillization shale in the raw coal, the coal slime floatability of-0.5mm level is poor, belong to utmost point difficult-to-float coal, and the floatation equipment that is adopted is 7 XJX-T12 type agitation impeller flotators that Huaibei industrial and mineral equipment manufacturing is made, through the operation more than 10 years, the equipment serious aging, flotation operation efficient is low.Seepage appears in body, and liquid level regulates flashboard and aeration quantity can't be adjusted, impeller heavy wear, and in process of production, the system that heavily is situated between still can wash out qualified cleaned coal, in any case and floatation system adjustment medicament ratio all is difficult to wash out qualified floating smart product.
Employing is handled and is handled flotation effect without surface property modifier through surface property modifier and relatively sees Table 1, and surface property modifier+micro-bubble flotation machine associating floatation process and the common floatation process effect of former mechanical flotation machine relatively see Table 2.
Experimental example 2
With ore deposit, land owned by officials coal preparation plant is example, it is for being designed into the mine type coal preparation plant of 3,000,000 tons of the abilities of washing year, be constructed and put into operation in March, 2003, and going into to wash raw coal is high-sulfur meager coal among ore deposit, land owned by officials 2#, 3# low-sulfur meager lean coal and 6#, 8#, the 9#, and major product is injection coal and electric cleaned coal.Former design coal preparation technique adopts does not have the sorting of the three products heavy medium cyclone of pressure, and the steam coal separation technology of mixing cleaned coal is reclaimed in the direct press filtration of not sorting of coal slime.After the operation, on the one hand because coal slime reclaimer ability wretched insufficiency, fault rate height cause wash water concentration high, can only keep to be interrupted and produce by prolonging the coal slime recovery time, system can not oepration at full load, has seriously restricted the raising of going into to wash ability; Not sorting of coal slime is directly mixed in the cleaned coal on the other hand, can't guarantee the quality of cleaned coal of jetting, and mixing not only influences the export trade raw coal quality in raw coal or the byproduct, and causes cleaned coal loss in the coal slime, and clean coal recovery descends significantly.
Adopt surface property modifier+micro-bubble flotation machine associating floatation process and microfoam flotation technological effect relatively to see Table 3.
Carry out interpretation of result by table 1～3, as follows:
1), behind the application surface modifying machine, no matter be that the floating smart sucrose extraction improvement value of eastern bent 8#, 4# coal or land owned by officials coal is 5～8%, unit consumption of medicine reduces 0.15kg/t.
2) surface property modifier+micro-bubble flotation machine is united use, for difficult float coal, go into to float many coals and floatability and change under the big condition, selectivity and flotation effect can both effectively be guaranteed, solve difficult-to-float coal and can not wash qualified floating smart product, the floating low difficult problem of smart productive rate, because the two mechanism of action has the part similarity, after the associating use, unit consumption of medicine reduces 0.2kg/t, and floating smart sucrose extraction improves more than 10%.
Though above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements all belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
The eastern bent ore deposit of table 1 coal preparation plant handles and handles flotation effect relatively without surface property modifier through surface property modifier
| Coal | Floatation process | Pan feeding | Product | Treating capacity | Unit consumption of medicine | The productive rate improvement value | |||
| Floating smart | Mine tailing | ||||||||
| Concentration | Aad | r | Aad | Aad | Q | ||||
| g/l | ％ | ％ | ％ | ％ | m 3/ h platform | Kg/t | ％ | ||
| 8 # 4 # | Through surface property modifier | 107.32 | 11.93 | 87.95 | 8.53 | 39.38 | 261 | 1.40 | 8.18 9.43 |
| Without surface property modifier | 107.74 | 11.93 | 79.77 | 8.04 | 29.09 | 261 | 1.42 | ||
| Through surface property modifier | 101.38 | 11.53 | 82.84 | 10.14 | 34.16 | 240 | 1.37 | ||
| Without surface property modifier | 123.97 | 11.53 | 73.41 | 9.7 | 25.37 | 240 | 1.46 | ||
The eastern bent ore deposit of table 2 coal preparation plant surface property modifier+WPF-Z5000 type flotation machine and XJX-T12 type flotation machine separating effect are relatively
| Coal | Equipment | Pan feeding | Main separation | Scan | Product | Treating capacity | Unit consumption of medicine | The productive rate improvement value | Index is improved in flotation | The flammable body rate of recovery | |||||||
| One section concentrate | Chats | Two sections concentrate | Mine tailing | Floating smart | Mine tailing | ||||||||||||
| Concentration | Aad | r | Aad | Aad | r | Aad | Aad | r | Aad | Aad | Q | ηwf | |||||
| g/l | ％ | ％ | ％ | ％ | ％ | ％ | ％ | ％ | ％ | ％ | m 3/ h platform | Kg/t | ％ | ％ | ％ | ||
| 4 # | The two associating | 118.07 | 15.74 | 51.51 | 10.09 | 22.72 | 23.42 | 11.69 | 31.75 | 83.95 | 10.55 | 31.75 | 557 | 1.14 | 12.14 | 32.85 | 89.12 |
| XJX-T12 | 118.07 | 15.74 | 71.81 | 11.70 | 25.98 | 215 | 1.36 | 21.85 | 75.25 | ||||||||
| 4 #、8 # | The two associating | 112.53 | 16.02 | 51.95 | 10.11 | 23.94 | 31.52 | 12.76 | 42.84 | 84.14 | 11.11 | 42.84 | 518 | 1.11 | 10.28 | 31.27 | 89.15 |
| XJX-T12 | 112.53 | 16.02 | 73.86 | 12.12 | 27.09 | 215 | 1.30 | 21.43 | 77.3 | ||||||||
Table 3 land owned by officials ore deposit coal preparation plant surface property modifier+micro-bubble flotation machine and micro-bubble flotation machine flotation effect
| Coal | Floatation process | Floatation feed | Product | Treating capacity | Unit consumption of medicine | Index is improved in flotation | The productive rate improvement value | ||||
| Floating smart | Mine tailing | ||||||||||
| Concentration | Ash content | Productive rate | Ash content | Productive rate | Ash content | ||||||
| g/L | ％ | ％ | ％ | ％ | ％ | m 3/ h group | kg/t | ％ | ％ | ||
| 2#、3#、6# | Surface property modifier+micro-bubble flotation machine | 94.5 | 18.18 | 83.49 | 9.33 | 16.51 | 64.46 | 731 | 1.27 | 49.67 | 4.43 |
| 2#、3#、6# | Micro-bubble flotation machine | 91.2 | 18.62 | 79.06 | 9.03 | 20.94 | 56.70 | 731 | 1.41 | 50.00 | |
Claims (6)
1. a floatation method of difficult-to-float coal is characterized in that it comprises the steps:
1) surfaction: will add the collecting agent of 0.8～1.2kg in the difficult-to-float coal aqueous mixtures of granularity per ton less than 0.5mm earlier, and injection surface property modifier, the rotating speed of control surface modifying machine is 100～200rpm, and feed pressure 0.1～0.3MPa handled 60～90 seconds;
2) microfoam flotation: and then it is injected micro-bubble flotation machine with foaming agent, cleaned coal in the difficult-to-float coal and coal slime are separated, wherein, the addition of foaming agent is to add 0.1～0.3kg in the difficult-to-float coal aqueous mixtures per ton, and micro-bubble flotation machine air pressure is controlled at 0.1～0.4MPa.
2. floatation method of difficult-to-float coal according to claim 1 is characterized in that, described microfoam flotation is handled and adopted two micro-bubble flotation machine serial or parallel connections to carry out.
3. floatation method of difficult-to-float coal according to claim 1 and 2 is characterized in that, described collecting agent is kerosene, light diesel fuel, shale light diesel fuel or MB series flotation agent.
4. according to any described floatation method of difficult-to-float coal of claim 1-3, it is characterized in that described foaming agent is natural foaming agent, industry byproduct foaming agent or manually synthetic foaming agent.
5. according to the described floatation method of difficult-to-float coal of claim 4, it is characterized in that described natural foaming agent is pine tar, No. 2 oil, camphorated oil or eucalyptus oils; Described industry byproduct foaming agent is GF flotation agent, secondary octanol or fusel; Described artificial synthetic foaming agent is ether frother or ether alcohol class foaming agent.
6. according to any described floatation method of difficult-to-float coal of claim 1-5, it is characterized in that, collecting agent and foaming agent ratio 5: 1～10: 1, the total flow of collecting agent and foaming agent is 1.0～1.4kg/t in the coal slime mixture per ton.
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