CN104069954A - Flotation column system and method for sorting high-concentration pulp - Google Patents
Flotation column system and method for sorting high-concentration pulp Download PDFInfo
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Abstract
The invention provides a flotation column system and method for storing high-concentration pulp. The system mainly comprises a feeding pipeline, an upper flotation column, a lower flotation column, a returning pipeline, a scavenging pulp circulating pipeline and a tailings box. The method comprises the following steps: connecting the upper flotation column and the lower flotation column in series by a staggering manner; pumping in the pulp through a feeding pump; performing flow mineralization through a generation pipe of an upper bubble generator; enabling the material that has relatively high flotation to be preferably floated in the upper flotation column and discharged through a concentrate bin; feeding the materials that are not sorted timely into the lower flotation column for further storing through the returning pipeline under the control of a peristaltic pump. According to the flotation column system and method for storing the high-concentration pulp, the material with high flotation is pre-floated through the upper flotation column in order to lower down the concentration of the pulp entering the lower flotation column, and thus the effects of pre-sorting by the upper flotation column and highly storing by the lower flotation column is realized, sectional floating and sorting are realized, and as a result, the technical problem that the high-concentration pulp flotation clean coal quality and clean coal recovery rate cannot be ensured at the same time can be solved, and thus the phenomena of pollution of the clean coal and running of tailings are greatly reduced.
Description
Technical field
The Coal Flotation Column Process and the method that the present invention relates to a kind of sorting high-concentration ore slurry, be particularly useful for the sorting of high concentration coal slurry, is also applicable to the sorting of other mineral.
Background technology
Flotation of ore pulp equipment is mainly flotation device and flotation column two classes.Flotation device mainly contains agitation impeller flotator and air jet flotation machine.It is larger that the deficiency of flotation device screening installation mainly contains power consumption, serious wear, and bubble size is larger, dispersed not enough, cell body is more shallow simultaneously, secondary enrichment a little less than, sorting superfine particle material effect is poor.The development of flotation column develops into the flotation column with aerated device and new construction by traditional filling medium flotation column, and wherein comparatively representational is rotational flow microbubble flotation column.
A rotational flow microbubble flotation column point favored area comprises three parts: selected section, the section of roughly selecting, the section of scanning.Ore pulp feeds from 2/3 of height of column, and mine tailing is discharged from the section of scanning underflow opening.Microvesicle generators is a cylinder external device (ED), utilizes jet current principle, forms air amount in negative pressure, and separate out a large amount of microvesicles by pressure differential in chamber, enters the section of scanning.Under the effect of the eddy flow field of force and buoyancy, Gu the gas-floc sedimentation of microvesicle and mineralising is to eddy flow center and move upward and enter the section of roughly selecting.Floating microvesicle and pan feeding ore pulp countercurrent movement, both contacts, collision, mineralising, hydrophobicity ore particle and microvesicle adhesion rising, hydrophily ore particle is failed mineralising and is entered the section of scanning, and so just realizes the high selectivity sorting of flotation column.The groundwork of the section of scanning is the cleaned coal of scanning the mineralising that is not able to do in time, thereby improves clean coal recovery.The centrifugal force field of the section of scanning has also been accelerated bubble in the radially dispersion on section of cylinder simultaneously, and bubble being more evenly distributed in cylinder is conducive to the mineralising of bubble and mineral grain.Under eddy flow force field, circulation chats separates by density variation, and low-density product is toward the motion of the section of scanning middle part and upwards enter flotation section, and finally floating becomes head coal product, high density product moves downward in the section of scanning outer, is finally discharged and is become floating tail-coal by underflow opening.
Along with the development of China's coal preparation technology, dense-medium separation technology is processed difficult separation coal because of it and is had superiority, and starts to occupy an leading position in coal separation.But the pulverization of dense medium cyclone causes the secondary slime in washing process large containing quantitative change, and its water consumption is compared Jigging process still less in addition, easily causes the black water excessive concentration of coal preparation plant, generally can reach 120g/L left and right, even higher.And the concentration of China's coal slime flotation generally should be controlled in 100g/L, the best sorting concentration of flotation column is 50-80g/L.Meanwhile, the use of China's coarse slime reclaimer, the coal slime granularity that makes to enter flotation is thinner, generally can reach below 0.3mm.The coal slime granularity of flotation is thinner, and the pulp density of suitable sorting is lower.These cause very large difficulty all to high-concentration ore slurry flotation, when flotation, can not ensure cleans ash and clean coal recovery simultaneously.Therefore, concentration exceedes the ore pulp of 80g/L, can think high concentration.If can solve the flotation of high-concentration ore slurry, not only can ensure product yield and quality, can also improve delivering dry coal slurry treating capacity, alleviate the burden of follow-up press filtration operation.
The structure of using for reference the series connection of flotation device multicell, has scholar to propose series connection Coal Flotation Column Process, and two flotation columns are together in series to process high-concentration ore slurry and improve flotation column enters to float the granularity upper limit.But this has just required two cover flotation column equipment, and floor space is large, and two cover systems can not make full use of simultaneously.For high-concentration ore slurry, there is scholar to propose to add reflection sulculus at flotation column internally feeding place, select the material that part floatability is good in priority floating.Facts have proved, this flotation column can improve flotation effect to a certain extent, but the layout of sulculus is more difficult, and can disturb ore pulp to flow.
For the thin large phenomenon of cement content of large, the high ash of slime separation pulp density now, there is scholar to propose the concept of multi-product flotation column, more typically there is three products flotation column, utilizing froth zone to let out back particle discharges separately, avoid intermediate products iterative cycles, alleviated head coal product because carrying the too high phenomenon of cleans ash causing secretly.But consider when pulp density is large, because mineralising is not enough and insufficient cleaned coal causing of sorting time is carried secretly and tail coal runs coal phenomenon, the disposal ability of multi-product flotation column is limited, can not fully allow material mineralising and allow not sorting ore pulp circulate to select again.
Summary of the invention
Technical problem: the object of the invention is to overcome the deficiencies in the prior art, a kind of simple in structure, simple operation is provided, effectively solves cleaned coal and carry Coal Flotation Column Process and the method for running the sorting high-concentration ore slurry of coal problem with tail coal secretly.
Technical scheme: the Coal Flotation Column Process of sorting high-concentration ore slurry of the present invention, comprise flotation column, lower flotation column, the top of lower flotation column is provided with the bridge piece being communicated with upper flotation column middle part, the top of upper flotation column is connected with concentrate hopper, on concentrate hopper, be furnished with spray water system, the middle part of lower flotation column is provided with lower flotation column feeding mouth, lower flotation rod structure is rotational flow microbubble flotation column, be provided with successively stabilier conically shaped from the downward inside of lower flotation column feeding mouth, conically shaped top forms post flotation cell, rotational flow sorting chamber is formed at bottom, lower flotation column eddy flow section outer wall order is connected with circulating pump, downforce table, bubble generator is back to lower flotation column, lower flotation column bottom is connected to tailing tank through debris tube, the height of tailing tank can free adjustment, form linker structure, described upper flotation column bottom is provided with flotation column feeding mouth, the underflow opening of upper flotation column is connected with lower flotation column feeding mouth through feed back pipe, the underflow opening of described upper flotation column is provided with the peristaltic pump of size and the feed back speed of controlled feed back amount processed outward, described upper flotation column feeding mouth connects and is connected with upper bubble generator, pressure gauge, feed pump and mineral slurry mixer in turn through feeding pipe.
Right to use requires a method for the sorting high-concentration ore slurry of Coal Flotation Column Process described in 1, comprises the steps:
A. by ore pulp pan feeding through mineral slurry mixer stir after, pump into feeding pipe by feed pump, ore pulp is in feeding pipe in advance after mineralising, again in upper bubble generator feeds upper flotation column, the ore pulp entering in flotation column flows into lower flotation column through feed back pipe, be full of after ore pulp until lower flotation column, ON cycle pump, in upper flotation column, the good drainage material of floatability can be discharged in advance by concentrate hopper, be not able to do in time sorting ore pulp from underflow opening discharge through peristaltic pump process after, be back to lower flotation column by feed back pipe and carry out conventional rotational flow microbubble flotation column sorting;
B. enter after flotation column flotation in advance, pulp density decreases, the downward sedimentation of material, under the pressure of bubble generator, produce a large amount of micro-bubbles, make ore pulp and bubble because of move toward one another generation adverse current collision mineralising, in lower flotation column, sorting material is not attached to and on bubble, becomes mineral laden bubble and rise to flotation column, the part not coming off enters concentrate hopper and discharges and the upper flotation column synthetic final concentrate of floating concentrate in advance, the unsorted ore pulp suction circulating pump coming off is got back to the eddy flow section of lower flotation column through bubble generator, generator tube stream mineralising and eddy flow mineralising in this partial material way, in the eddy flow field of force, continue sorting, wherein drainage material can float and enter concentrate, hydrophilic material is discharged as mine tailing through tailing tank by debris tube,
C. causing carrying secretly the poor material of part floatability because the sorting time is insufficient by the material of lower flotation column emersion floats together, what this part material had directly comes off and enters mine tailing in uphill process, what have enters flotation column, after secondary enrichment, the peristaltic pump processing being connected by upper flotation column underflow opening place, in feed back pipe is back to lower flotation column again, continue circulation sorting, become true tailings and discharge.
Beneficial effect: the present invention is directed to the concentrate product quality of the sorting high-concentration ore slurry in existing flotation technology and the technical barrier that the concentrate rate of recovery can not ensure simultaneously, flotation column, series connection flotation, strengthening mineralising and eddy flow field of force sorting organically combine, according to the inner link of the surface nature of material and density variation, make the pre-mineralization of material process pan feeding pipeline at the better material of the pre-emersion floatability of upper flotation column, reduce the pulp density of the pan feeding of lower flotation column simultaneously, utilize the intensified sorting of sorting again of lower flotation column, form two sections of sortings, obtain final floating product, solve traditional rotational flow microbubble flotation column to high concentration, the thin poor problem of the large ore pulp separating effect of cement content.Compared with prior art, tool has the following advantages:
1. by the pre-floating sorting mode of choosing again that adds, efficiently solve the technical barrier of flotation to the large slime separation weak effect of too high, the thin cement content of pulp density.Floatingly select in advance through upper flotation column the material that floatability is good, reduce the concentration of lower flotation column pan feeding, then by the intensified sorting of lower flotation column, ensured the head coal product rate of recovery, reduce in tail coal and run coal phenomenon.
2. adopt upper flotation column and the lower flotation column mode being connected that misplaces, can increase the come off distance of hydrophilic granules in floating-upward process, both can come off at upper cylinder, also can come off at lower prop, avoided the phase mutual interference between product.Simultaneously after two sections of cylinder dislocation, by the feed back pipeline of upper flotation column bottom, be conducive to unsorted ore pulp and again get back to lower flotation column continuation sorting by upper flotation column, the ore pulp treating capacity that can avoid ore pulp to cause at lower flotation column direct circulation is excessive, lower flotation column disposal ability deficiency, cause the not being able to do in time material of sorting is directly discharged by tailing tank, causes and runs coal phenomenon.The mode that circulation adds segmentation sorting so not only ensures product quality, has also increased the treating capacity of flotation column, namely processes the basic reason of high-concentration ore slurry.Compare traditional flotation column, this Coal Flotation Column Process can reduce height of column; Compare series connection flotation column, this Coal Flotation Column Process can be saved horizontal space, has saved factory building arrangement space, reduces capital expenditure.
3. the adjusting of the pre-mineralising feed pressure by upper flotation column, can control pre-mineralization degree, thereby controls upper flotation column floating inventory in advance.This just can be avoided only depending on the excessive sorting ore pulp environment causing of lower flotation column circulating pressure unstable, and the bubble merging serious phenomenon that vanishes, can avoid again the too small flotation pulp gas holdup causing of lower flotation column circulating pressure too small, the insufficient phenomenon of flotation causing.After going up flotation column and staggering, be conducive to the feed back of ore pulp simultaneously, the secondary enrichment of reinforced foam layer, feed back amount can be controlled through feed back pipeline flexibly by peristaltic pump.
Brief description of the drawings
Fig. 1 is high-concentration ore slurry flotation column separation system schematic diagram of the present invention.
In figure: mineral slurry mixer-1, feed pump-2, pressure gauge-3, upper bubble generator-4, concentrate hopper-5, upper flotation column-6, bridge piece-7, lower flotation column-8, peristaltic pump-9, conically shaped-10, stabilier-11, circulating pump-12, downforce table-13, bubble generator-14, debris tube-15, tailing tank-16, upper flotation column feeding mouth-17, lower flotation column feeding mouth-18, spray header-19, feeding pipe-20, feed back pipe-21.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
As shown in Figure 1, the Coal Flotation Column Process of sorting high-concentration ore slurry of the present invention, mainly formed by upper flotation column 6, lower flotation column 8, peristaltic pump 9, charging gear, foam device, described charging gear comprises mineral slurry mixer 1, feed pump 2, pressure gauge 3 and upper bubble generator 4, connects successively through feeding pipe 20.Pan feeding is connected with upper flotation column 6 after mineral slurry mixer 1 is linked in sequence feed pump 2, Pressure gauge 3, bubble generator 4.Lower flotation column 8 structures are rotational flow microbubble flotation column, be provided with successively stabilier 11 conically shapeds 10 from the downward inside of lower flotation column feeding mouth 18, conically shaped 10 tops form post flotation cell, rotational flow sorting chamber is formed at bottom, lower flotation column 8 eddy flow section outer walls orders are connected with circulating pump 12, downforce table 13, bubble generator 14 and are back to lower flotation column 8, lower flotation column 8 bottoms are connected to tailing tank 16 through debris tube 15, the height of tailing tank 16 can free adjustment, forms linker structure, controls mineral pulp level.Described foam device comprises conically shaped 10, stabilier 11, circulating pump 12, downforce table 13, bubble generator 14, conically shaped 10 is located at lower flotation column 8 bottoms, stabilier 11 is located at conically shaped 10 tops, circulating pump 12, downforce table 13, bubble generator 14 are contacted by the road, circulating pump 12 entrance one end are connected with lower flotation column 8 outlets that are positioned at conically shaped 10 outer surface, and outlet one end of bubble generator 14 is connected with lower flotation column 8 entrances that are positioned at conically shaped 10 bottoms.The top of described lower flotation column 8 is provided with the bridge piece 7 being communicated with upper flotation column 6 middle parts, the top of upper flotation column 6 is connected with concentrate hopper 5, on concentrate hopper 5, be furnished with spray water system 19, the middle part of lower flotation column 8 is provided with lower flotation column feeding mouth 18, the bottom of lower flotation column 8 is provided with foam device, bottom is connected with the tailing tank 16 of adjustable flotation fluid height through debris tube 15, described upper flotation column 6 bottoms are provided with flotation column feeding mouth 17, the underflow opening of upper flotation column 6 is connected with lower flotation column feeding mouth 18 through feed back pipe 21, the underflow opening of described upper flotation column 6 is provided with the peristaltic pump 9 of size and the feed back speed of controlled feed back amount processed outward, the peristaltic pump 9 of upper flotation column 6 belows flow to lower flotation column feeding mouth 18 through feed back pipe 21.Described upper flotation column feeding mouth 17 connects and is connected with upper bubble generator 4, pressure gauge 3, feed pump 2 and mineral slurry mixer 1 in turn through feeding pipe 20.
The method of sorting high-concentration ore slurry of the present invention, concrete steps are as follows:
1. ore pulp is added to together with floating agent to mineral slurry mixer 1, after fully stirring, feed upper flotation column 6 by feed pump 2, pressure gauge 3, upper bubble generator 4, generator tube stream mineralization when this part ore pulp process feeding pipe 20, can control the degree of mineralising by the valve of pressure gauge 3, and by the pressure reflection of pressure gauge 3;
2. enter after upper flotation column 6 through the material of mineralising in advance, enter lower flotation column 8 by feed back pipe 21 rapidly, after pan feeding is full of lower flotation column 8, open circulating pump 12 and feed back peristaltic pump 9, circulating pressure is by downforce table 13 valve regulated, feed back amount is passed through peristaltic pump 9 rotational speed regulation, and can distinguish reading; The good drainage material of the interior floatability of upper flotation column 6 can be discharged in advance by concentrate hopper 5, and the ore pulp of the sorting that is not able to do in time is discharged after peristaltic pump 9 is processed from underflow opening, is back to lower flotation column 8 carries out conventional rotational flow microbubble flotation column sorting by feed back pipe 21; Liquid level in lower flotation column 8 can be passed through tailing tank 16 height adjustment, and liquid level is taken the circumstances into consideration lifting according to the flooding velocity of the size of ore pulp capacity of returns and concentrate; In the time that concentrate and tailings is discharged respectively, can form stable sorting environment;
3. the ore pulp after pipe stream mineralising enters after upper flotation column 6, pulp density decreases, the downward sedimentation of material, under the pressure of bubble generator 14, produce a large amount of micro-bubbles, make ore pulp and bubble because of move toward one another generation adverse current collision mineralising, the adhesion that bumps of bubble and material, the good material of hydrophobic floatability, enter concentrate froth bed, after enrichment, discharge through concentrate hopper 5, the material that does not complete mineralising drops to outlet at bottom and controls by feed back pipe 21 and enter lower flotation column 8 through peristaltic pump 9; In this process, the good drainage material of floatability is realized relative static separation with mineralising material not, realizes static prefloat, makes the pulp density that enters lower flotation column 8 also because the minimizing of dry material amount decreases simultaneously;
4. the ore pulp that enters lower flotation column 8 continues to occur adverse current collision mineralising in lower flotation column 8 flotation sections, sorting material is not attached to and on bubble, becomes mineral laden bubble and rise, the good material of floatability is under the Float upward function of bubble, be carried into flotation column 6 froth zones, continue secondary enrichment, discharged finally by concentrate hopper 5; Remaining more difficult floating material enters eddy flow section, by the continuation pipe stream mineralization of centrifugal force and circulating pump pipeline;
5. enter the material of eddy flow section, again scan through eddy flow section, this part exist material in ore pulp to be recycled pump 12 to extract out after after there is stronger pipe stream mineralization in bubble generator 14, inject rotational flow sorting section by tangent line, under the effect of centrifugal force, drainage material enters overflow, is entered and is floated up to concentrate hopper 5 by conically shaped 10, hydrophilic material is discharged by tailing tank 16 through debris tube 15 to bottom along post jamb landing, becomes true tailings; Downforce table 13 is wherein for measuring circulating pressure value, and bubble generator 14 is because suction function is from air amount, for whole lower flotation column 8 sortings provide suitable micro-bubble, and with nozzle near high-speed jet generation mineralization, realization is scanned;
All in lower flotation column 8 concentrate of floating, in floating-upward process, hydrophobic granule can come off because of Action of Gravity Field, also can continue to occur secondary enrichment, the particle that discharge section is carried secretly after entering flotation column 6; Finally, the concentrate of upper flotation column 6 concentrate and lower flotation column 8 is all discharged from the concentrate hopper 5 on upper flotation column 6 tops, synthetic final concentrate.
Claims (2)
1. the Coal Flotation Column Process of a sorting high-concentration ore slurry, comprise flotation column (6), lower flotation column (8), the top of lower flotation column (8) is provided with the bridge piece (7) being communicated with upper flotation column (6) middle part, the top of upper flotation column (6) is connected with concentrate hopper (5), on concentrate hopper (5), be furnished with spray water system (19), the middle part of lower flotation column (8) is provided with lower flotation column feeding mouth (18), lower flotation column (8) structure is rotational flow microbubble flotation column, be provided with successively stabilier (11) conically shaped (10) in inside downwards from lower flotation column feeding mouth (18), conically shaped (10) top forms post flotation cell, rotational flow sorting chamber is formed at bottom, lower flotation column (8) eddy flow section outer wall order is connected with circulating pump (12), downforce table (13), bubble generator (14) is back to lower flotation column (8), lower flotation column (8) bottom is connected to tailing tank (16) through debris tube (15), the height of tailing tank (16) can free adjustment, form linker structure, it is characterized in that: described upper flotation column (6) bottom is provided with flotation column feeding mouth (17), the underflow opening of upper flotation column (6) is connected with lower flotation column feeding mouth (18) through feed back pipe (21), the underflow opening of described upper flotation column (6) is provided with the peristaltic pump (9) of size and the feed back speed of controlled feed back amount processed outward, described upper flotation column feeding mouth (17) connects and is connected with upper bubble generator (4), pressure gauge (3), feed pump (2) and mineral slurry mixer (1) in turn through feeding pipe (20).
2. right to use requires a method for the sorting high-concentration ore slurry of Coal Flotation Column Process described in 1, it is characterized in that, comprises the steps:
A. by ore pulp pan feeding through mineral slurry mixer (1) stir after, pump into feeding pipe (20) by feed pump (2), ore pulp is in feeding pipe in advance after mineralising, again in upper bubble generator (4) feeds upper flotation column (6), the ore pulp entering in flotation column (6) flows into lower flotation column (8) through feed back pipe (21), be full of after ore pulp until lower flotation column, ON cycle pump (12), the good drainage material of the interior floatability of upper flotation column (6) can be discharged in advance by concentrate hopper (5), the be not able to do in time ore pulp of sorting is discharged through after peristaltic pump (9) processing from underflow opening, be back to lower flotation column (8) by feed back pipe (21) and carry out conventional rotational flow microbubble flotation column sorting,
B. enter after flotation column (6) flotation in advance, pulp density decreases, the downward sedimentation of material, under the pressure of bubble generator (14), produce a large amount of micro-bubbles, make ore pulp and bubble because of move toward one another generation adverse current collision mineralising, in lower flotation column (8), sorting material is not attached to and on bubble, becomes mineral laden bubble and rise to flotation column (6), the part not coming off enters concentrate hopper (5) and discharges and upper flotation column (6) the synthetic final concentrate of floating concentrate in advance, the unsorted ore pulp suction circulating pump (12) coming off is got back to the eddy flow section of lower flotation column (8) through bubble generator (14), generator tube stream mineralising and eddy flow mineralising in this partial material way, in the eddy flow field of force, continue sorting, wherein drainage material floating enters concentrate, hydrophilic material becomes mine tailing by debris tube (15) through tailing tank (16) and discharges,
C. causing carrying secretly the poor material of part floatability because the sorting time is insufficient by the material of lower flotation column (8) emersion floats together, what this part material had directly comes off and enters mine tailing in uphill process, what have enters flotation column (6), after secondary enrichment, the peristaltic pump (9) being connected by upper flotation column (6) underflow opening place is processed, in feed back pipe (21) is back to lower flotation column (8) again, continue circulation sorting, become true tailings and discharge.
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| CN104668108A (en) * | 2014-12-29 | 2015-06-03 | 山东东山王楼煤矿有限公司 | Flotation device and method for coal slime |
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| CN109070097A (en) * | 2015-12-11 | 2018-12-21 | Wv过程解决方案公司 | Device and method for foam fraction factor |
| CN106984442A (en) * | 2017-05-15 | 2017-07-28 | 中国矿业大学 | A kind of multi-point combination inflation reduces the device and method of high grey thin mud pollution |
| CN106984442B (en) * | 2017-05-15 | 2023-03-21 | 中国矿业大学 | Device and method for reducing high-ash fine mud pollution through multi-point combined aeration |
| US10655300B2 (en) | 2017-07-14 | 2020-05-19 | Vermeer Manufacturing Company | Cyclonic separation systems and hydro excavation vacuum apparatus incorporating same |
| AU2019434220B2 (en) * | 2019-03-14 | 2022-12-22 | China University Of Mining And Technology | Wide-size-fraction flotation system and process |
| CN110124873A (en) * | 2019-04-04 | 2019-08-16 | 太原睿孚特选煤技术有限公司 | A kind of segmented mechanical stirring pressure mineralising floatation equipment |
| CN110124873B (en) * | 2019-04-04 | 2024-02-02 | 太原睿孚特选煤技术有限公司 | Sectional type mechanical stirring forced mineralization flotation equipment |
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Address after: 221116 Research Institute of China University of Mining and Technology,, Jiangsu Applicant after: China University of Mining & Technology Address before: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Applicant before: China University of Mining & Technology |
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