CN102806138B - Combined desliming process capable of being used for beneficiation - Google Patents
Combined desliming process capable of being used for beneficiation Download PDFInfo
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- CN102806138B CN102806138B CN201210294390.9A CN201210294390A CN102806138B CN 102806138 B CN102806138 B CN 102806138B CN 201210294390 A CN201210294390 A CN 201210294390A CN 102806138 B CN102806138 B CN 102806138B
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Abstract
The invention discloses a combined desliming process capable of being used for beneficiation. The combined desliming process includes the steps: performing first-stage grinding and first-stage classifying for crushed ore products, returning underflow to first-stage grinding, and performing second-stage classifying for overflow; performing second-stage grinding for the underflow after second-stage classifying, and returning ground discharging to second-stage classifying; subjecting the overflow to low-intensity magnetic separation, performing concentration, slag separation and high-intensity magnetic separation which has the effect of first-stage desliming for tailings subjected to low-intensity magnetic separation, and subjecting magnetic concentrates to third-stage classifying; performing third-stage grinding for the classified underflow, and returning the discharging to third-stage classifying; and subjecting the overflow to second-stage desliming, performing low-intensity magnetic roughing separation for the underflow after second-stage desliming to obtain rough concentrates, and subjecting the tailings to third-stage or more than fourth-stage desliming. Besides, a densifier and a selective flocculation desliming process are adopted for desliming at each stage. The combined desliming process capable of being used for beneficiation has the advantages of low investment cost, small occupied area, convenience in production and maintenance, high adaptability, good desliming effect and the like.
Description
Technical field
The present invention relates to a kind of desliming process of ore, relate in particular to a kind of combination desliming process that can be used for ore dressing.
Background technology
The resources characteristic of China's iron ore is that lean ore is many, fine-grained disseminated grain many, ore type is complicated, poor, thin, assorted.Along with the fast development of China's steel industry, the iron ore resource of high-grad iron ore deposit and Yi Xuan is fewer and feweri, and remaining iron ore is mainly poor, thin, assorted refractory iron ore, and utilization rate is low at present.Under such background, fully develop existing iron ore more and more important.And to develop this part ore resource, just must carry out fragmentation, fine grinding to ore, fully to realize the monomer dissociation of valuable mineral.But in the process of fine grinding, because the grindability of different minerals exists difference, the process characteristic of fine grinding in addition, there will be argillization phenomenon conventionally.The follow-up floatation indicators of generation meeting severe exacerbation of sludge, because the particle in sludge is generally micro-size fraction, the more difficult bubble surface that is attached to forms mineralized froth layer emersion, contrary its is more easily attached to coarse granule surface and forms slime coating, can significantly reduce like this floatability of the selective and coarse granule gangue mineral of reverse flotation process.In addition, the specific surface of sludge and surface can be large, can consume a large amount of floating agents, increase beneficiation cost.In a word, grade, the rate of recovery of the existence of sludge on flotation concentrate has direct impact, so as the attendant phenomenon of fine grinding process, industrially must take measures to eliminate the impact of sludge on follow-up sorting operation.
Process the measure of sludge, common are the dispersion of strengthening ore pulp, classification, desliming etc.Wherein, adopting the method removal sludge of desliming is more common way.Selective flocculation to remove slime is to form iron mineral floc sedimentation by " bridging " effect to realize ore and the effective technology separating of sludge, it both can remove the most of sludge in iron ore, thereby eliminate the adverse effect of sludge to follow-up ore dressing process, can also improve the grade of iron, and ensure that iron mineral can be with mud heavy losses, investment cost is low, can process preferably fine fraction mineral.
For the equipment of desliming, common are hydrocyclone, thickener, various desliming buckets etc.Cyclone is a kind of efficient simple desliming device, there is equipment and take up an area that little, treating capacity is large, the feature of small investment, removing of the mud of, fine size light for density is effective especially, but the desliming effect of cyclone is vulnerable to the impact such as feed ore concentration and pressure, easily fluctuation, be difficult to ensure the continuity of production, so affect the stability of the mineral processing index of whole flow process.And cyclone is not suitable for adopting Flocculation desliming method.Desliming bucket separate unit treating capacity is less, and on producing, is difficult to control.For the beneficiation flowsheet of three sections of needs or above desliming processing, the unstable of single hop desliming can affect whole desliming effect, so equipment operation rate is difficult to ensure.
Be the iron ore resource of fine grain teeth cloth for valuable mineral, conventionally need to carry out three sections or three sections of above grinding operations, and between every section of grinding operation, also often need to carry out desliming, to prevent that primary mud and secondary mud from exerting an influence to follow-up sorting operation.Ore pulp enters before relevant sorting operation, often also needs to carry out desliming, to reduce the impact of sludge on concentrate grade.Based on the feature of this class ore resource, desliming highlights gradually as an important operation step in whole process program, reasonably desliming scheme has increased by ore dressing and has realized the feasibility that relevant resource synthetic development utilizes, and also there is no industrial practice at home and abroad but carry out three sections or above selective flocculation to remove slime technique using thickener as desliming device.Therefore, studying and improve existing desliming scheme selects poor iron ore resource to have very important directive significance for the abundant fine fraction difficulty of exploitation China's reserves.
Summary of the invention
One, between secondary grinding and three sections of ore grindings, carry out one section of desliming, after three sections of ore grindings, carry out again follow-up desliming processing, desliming stage by stage is like this basic ideas of removing the sludge of stage grinding generation, but different phase adopts same desliming process often can not reach and be difficult to object, the present invention overcomes the deficiencies in the prior art, according to the ore grinding stage and for the material of size fractionated, provide a kind of cost of investment lower, floor space is little, production maintenance is easy, strong adaptability, desliming is effective, and be conducive to ensure stability and the successional combination desliming process that can be used for ore dressing of production.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of combination desliming process that can be used for ore dressing, comprises the following steps:
(1) the ore product after fragmentation is first carried out to primary grinding, the discharge after primary grinding carries out one section of classification, and the underflow after one section of classification returns and again enters primary grinding, and the overflow after one section of classification enters into next step;
(2) two sections of classifications are carried out in the overflow after above-mentioned one section of classification, and the underflow after two sections of classifications carries out secondary grinding, and the discharge after secondary grinding returns and again enters two sections of classifications, and the overflow after two sections of classifications enters into next step;
(3) overflow after two sections of classifications is carried out to low intensity magnetic separation, magnetic tailing after low intensity magnetic separation through concentrated, every slag, high intensity magnetic separation processing, described high intensity magnetic separation is as one section of desliming, the magnetic concentrate after low intensity magnetic separation and high intensity magnetic separation carries out three sections of classifications;
Underflow after (4) three sections of classifications carries out three sections of ore grindings again, and after three sections of ore grindings, discharge returns and again enters three sections of classifications, and the overflow after three sections of classifications enters into next step;
(5) overflow after above-mentioned three sections of classifications is carried out to two sections of deslimings, a little less than the underflow after two sections of deslimings carries out, magnetic is roughly selected and is obtained rough concentrate, and the mine tailing after weak magnetic is roughly selected carries out follow-up three sections of deslimings or four sections of desliming processing more than desliming;
Each section of desliming after described step (4) processed and all adopted selective flocculation to remove slime technique, and the desliming device of each section of desliming employing is thickener.Overflow after concentrated overflow in described step (3), on-the-sieve material, high intensity magnetic separation mine tailing and each section of desliming every slag all can merge as mine tailing processing.(process flow diagram of the present invention is referring to Fig. 2).
In the technique scheme that the present invention proposes, described combination desliming mainly refers to the combination of high intensity magnetic separation desliming method and selective flocculation to remove slime method.Wherein, the object of low intensity magnetic separation is to reclaim as early as possible strongly magnetic mineral, prevents a large amount of existence of strongly magnetic mineral and is unfavorable for high intensity magnetic separation operation; Concentrated object is to improve the pulp density of low intensity magnetic separation mine tailing, for high intensity magnetic separation provides the feed of suitable concn, removes part sludge simultaneously; Be to remove coarse granule every the object of slag, prevent the situation that high intensity magnetic separation stops up, in other words, low intensity magnetic separation, concentrated and are all the preparation works for high intensity magnetic separation every slag.The object of described high intensity magnetic separation is to reclaim weak magnetic mineral, and plays the effect of the sludge of removing primary mud and one, secondary grinding generation simultaneously; The object of two sections, three sections follow-up above desliming processing is mainly to remove the sludge producing in three sections of ore grindings (fine grinding).
The above-mentioned combination desliming process that can be used for ore dressing, in described selective flocculation to remove slime process, pH value is preferably controlled at 9～10.In described selective flocculation to remove slime process, the pH adjusting agent adopting when described pH value is controlled is preferably NaOH, and the consumption of described NaOH is preferably by 1.2kg/t～1.5kg/t (representing the NaOH quality that add in remaining ore deposit per ton).In described selective flocculation to remove slime process, the flocculant of employing is preferably humic acid amide, and the consumption of humic acid amide is preferably the quality that 0.75kg/t～0.9kg/t(represents the humic acid amide adding in remaining ore deposit per ton).In described selective flocculation to remove slime process, feed ore concentration (giving the shared mass percent in dry ore deposit in the ore pulp in ore deposit) while controlling each section of desliming is preferably 12%～20%, and underflow density (being to do the shared mass percent in ore deposit after desliming in ore pulp) is preferably 30%～50%.
In above-mentioned combination desliming process, as further improvement, described thickener is preferably the modified thickener of the present invention's design, it comprises thickener pond body (being specially adapted to the thickener of diameter more than 12m), the periphery of thickener pond body arranges downflow weir, the bottom of thickener pond body is provided with the harrow frame to spigot place at the bottom of pond by the ore pulp cleaning depositing in pond, on the height and position between described modified thickener overflow liquid level and described harrow frame, be provided with water pipe, on water pipe, offer the delivery port being directed upwardly.The top of described thickener pond body is preferably provided with a crane span structure, and described water pipe is connected in crane span structure below.Described water pipe is preferably height-adjustable water pipe.Realizing adjustable for height apparatus and method can need to be selected to install according to practice by those skilled in the art voluntarily.
As above-mentioned modified thickener is further improved, described thickener pond body is preferably cylindrical shape or similar columnar other shapes (for example top cylinder+bottom inverted cone), the corresponding annular conduit that is preferably of described water pipe, on described annular conduit, evenly (or equidistantly) is laid with multiple delivery ports.Multiple delivery ports on same annular conduit are preferably laid on annular conduit evenly and at intervals around the central axis (vertically) of annular conduit.The quantity of described annular conduit is preferably more than two, and each annular conduit has different diameters, the central axis of the annular conduit of described different-diameter all with the central axes of thickener.Preferred, the quantity of described annular conduit is two, comprises two annular conduits of large and small different-diameter (diameter of annulus); If the internal diameter of described thickener pond body is D, the diameter of major diameter annular conduit is the distance of the d1(pipe section center of circle to central axis, does not consider pipe section size, lower same), the diameter of minor diameter annular conduit is d2, has d1/D=75%～85%, d2/D=50%～60%.Preferred, the degree of depth of establishing described thickener pond body is H, and two described annular conduits fitting depth (apart from the height of overflow liquid level) in the body of thickener pond is h, has h/H=15%～25%.The annular conduit of described different-diameter also can preferably be arranged on and in the body of thickener pond, on differing heights position, form steppedly, and reduces gradually (being that the degree of depth increases gradually) from the rotating shaft of thickener pond body toward periphery height.
In above-mentioned modified thickener, on described annular conduit, by being set, inverted T-shaped tube connector described delivery port is divided be located at the inside and outside both sides of annular conduit, to produce better ascending current.The ore pulp of described thickener pond body is preferably arranged on the top of pool center to entrance.
In the present invention, the operation principle of preferred modified thickener mainly: in combination desliming process of the present invention, large for mine treatment scale, need to adopt larger-diameter thickener to carry out the situation of desliming, in sedimentation time one timing, because the radius of thickener is larger, sludge need to could arrive through longer horizontal throw the downflow weir of thickener periphery, and sludge may not arrive downflow weir and just approaching the near zone sedimentation of downflow weir; The present invention is by improving desliming device, in the body of thickener pond, set up annular conduit, this makes sludge particle, and from being originally only subject to gravity He Yin center, to mineral products, the raw horizontal thrust effect to downflow weir direction became the triple role that is subject to the external force vertically upward that gravity, horizontal thrust and ascending water provide, this further makes the sinking speed of sludge particle in water slow down, movement locus changes, within certain sedimentation time, vertical stroke is less, can reach downflow weir place and be collected to ensure more sludge particles.In the running of desliming device of the present invention, can carry out Real-Time Monitoring (also can manual sampling monitoring) to the feed ore concentration of desliming device, effluent concentration, overflow grade; The water supply pressure of water pipe, flow are wanted evenly, are stablized, and can automatically adjust water flow according to the monitoring situation of overflow and underflow.
The above-mentioned combination desliming process that can be used for ore dressing, described ore product preferably refers to microfine iron ore, and described microfine iron ore is the mixing ore deposit as leading taking magnetic iron ore and bloodstone, and the disseminated grain size of described microfine iron ore is generally 2 μ m～30 μ m.The feed preparation unit size of described primary grinding is controlled at below 10mm.
The above-mentioned combination desliming process that can be used for ore dressing, described primary grinding, secondary grinding, three sections of ore grindings all preferably adopt ball mill to carry out ore grinding.The above-mentioned selective flocculation multistage desliming process that can be used for ore dressing, described one section of classification, two sections of classifications, three sections of classifications all preferably adopt cyclone to carry out classification.Described ore grinding and classification are all to carry out in closed circuit grinding system, for example, and primary grinding and one section of closed circuit grinding system of one section of classification composition.
The above-mentioned combination desliming process that can be used for ore dressing, the draw ratio of the ball mill that described three sections of ore grindings adopt is preferably 2.5～3.0.The milling medium adopting in described primary grinding is steel ball, and the milling medium adopting in described secondary grinding and three sections of ore grindings is steel section, and the charging quantity of described steel section is 20%～40% of described ball mill barrel volume.
The above-mentioned combination desliming process that can be used for ore dressing, described steel section is preferably biplane round platform shaped steel section.The diameter of described steel section is Φ 20mm～45mm; In described secondary grinding, the proportioning of the steel section of different size is Φ 45 × 50: Φ 30 × 35: Φ 20 × 25=3.5～4.5: 3.5～4.5: 1～3; In described three sections of ore grindings, the proportioning of the steel section of different size is Φ 30 × 35: Φ 20 × 25=7～9: 1～3.
The above-mentioned combination desliming process that can be used for ore dressing, the preferably control-0.074mm of ore discharge fineness of described primary grinding accounts for 75%～80%; The preferably control-0.048mm of ore discharge fineness of described secondary grinding accounts for more than 85%; Described three sections of ore grindings adopt the cyclone of Φ 150mm to carry out cyclone classification, and the preferably control-0.025mm of ore discharge fineness after three sections of ore grindings accounts for more than 85%.
Compared with prior art, the invention has the advantages that:
1. the present invention adopts the desliming process of high intensity magnetic separation and selective flocculation combination, high intensity magnetic separation is for the treatment of the sludge in-0.074mm grade material, selective flocculation is for the treatment of the sludge in-0.037mm grade material, make desliming device with intensity magnetic separator and modified thickener respectively, carry out multistage (preferably four sections) desliming, remove the secondary mud that primary mud and ore grinding produce, after desliming, the grade of iron has a distinct increment, and iron mineral is less with mud loss, desliming productive rate reaches more than 50%, has eliminated sludge to the particularly impact of reverse flotation work of flotation.
The present invention taking intensity magnetic separator as pan feeding the desliming device as-0.074mm grade, easy to operate, easy to control, when ensureing weak magnetic recovery, removed sludge and gangue mineral; The present invention is also preferably the desliming device of-0.074mm grade taking modified thickener as pan feeding, and steadily reliable, easy maintenance, has good adaptability to the fluctuation of ore-sorting system, makes process system have larger flexibility and adaptability.
3. desliming process of the present invention is preferably applied to after the ore dressing of iron ore, has removed the secondary mud that primary mud and fine grinding produce, and after desliming, the grade of iron has a distinct increment, and iron mineral is less with mud loss, and this provides the raw material of high-quality more for follow-up sorting operation.
In the preferred desliming process of the present invention using NaOH as pH adjusting agent, using humic acid amide as flocculant, the desliming effect that it has ensured selective flocculation technique, is a kind of economically viable medicament assembled scheme.
5. in the preferred desliming process of the present invention, also adopted a kind of modified thickener simple in structure, easy for installation, it has changed the movement locus of sludge in thickener desliming process by the method that increases ascending current, make the sludge particle downflow weir that flows to as much as possible, improved desliming effect; This modified thickener can be adjusted the flow of ascending current automatically according to the result of the feed ore concentration of desliming device, effluent concentration and overflow grade Real-Time Monitoring, can dynamically control desliming process; Its successful Application not only can be enriched the selection space of desliming device, and can promote selective flocculation method, application prospect in conjunction with concentrated type desliming device in mineral dressing and desliming field.
Generally speaking, technical scheme of the present invention has been filled up and in this area, has been adopted three sections or three sections of blank of carrying out above multistage desliming, has good desliming effect.Technical scheme of the present invention is one of important step developing microfine iron ore resource overall technology, industrial employing Desliming method is removed the secondary mud of primary mud and the generation of fine grinding process and for follow-up flotation (particularly reverse flotation) provides qualified raw material, also finally obtains qualified concentrate product, all had very positive meaning.
Brief description of the drawings
Fig. 1 is the process chart for the selective flocculation multistage desliming process of ore dressing in the embodiment of the present invention.
Fig. 2 is the process chart of preferred compositions desliming process of the present invention.
Fig. 3 is the main TV structure schematic diagram of modified thickener in the embodiment of the present invention.
Fig. 4 be in Fig. 3 modified thickener at the cutaway view at A-A place.
Marginal data:
1. thickener pond body; 11. spigots; 2. downflow weir; 3. harrow frame; 4. annular conduit; 41. delivery ports; 42. outer shroud water pipes; 43. interior ring water pipes; 44. inverted T-shaped tube connectors; 5. ore pulp is to entrance; 6. crane span structure; 7. bracing frame; 8. annular water inlet pipe; 9. water-supply-pipe.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
Embodiment:
A combination desliming process for ore dressing of the present invention as shown in Figure 1, comprises the following steps:
(1) certain microfine iron ore that the product granularity after fragmentation is controlled at below 10mm (is supposed production scale 2,300,000 t/a, iron mineral is mainly by magnetic iron ore, bloodstone and a small amount of martite composition, and taking magnetic iron ore as main, head grade is in 28% left and right, valuable mineral disseminated grain size is mostly 2 μ m～30 μ and m) carries out primary grinding (Φ 500mm × 6 a cluster cyclone-Φ 4.5 × 9m overflowball mill), discharge after primary grinding carries out one section of classification, underflow after one section of classification returns and again enters primary grinding, overflow after one section of classification enters into next step, the ore discharge fineness control-0.074mm of primary grinding account for 76%(working control more than 76% all can),
(2) two sections of classifications are carried out in the overflow after above-mentioned one section of classification, underflow after two sections of classifications carries out secondary grinding (Φ 350mm × 10 a cluster cyclone-Φ 4.5 × 9m overflowball mill), discharge after secondary grinding returns and again enters two sections of classifications, overflow after two sections of classifications enters into next step, the ore discharge fineness control-0.048mm of secondary grinding account for 90%(working control more than 90% all can);
(3) overflow after above-mentioned two sections of classifications is carried out to low intensity magnetic separation, magnetic tailing after low intensity magnetic separation is through concentrated (Φ 30m modified thickener), every slag (SL-2000 drum sieve), high intensity magnetic separation processing (SLon-2000 intensity magnetic separator), high intensity magnetic separation has the treatment effect of one section of desliming, and the magnetic concentrate after low intensity magnetic separation and high intensity magnetic separation carries out three sections of classifications; Concentrated overflow, scan mine tailing every on-the-sieve material, the high intensity magnetic separation of slag and do mine tailing processing;
Underflow after (4) three sections of classifications carries out three sections of ore grindings again and (in three sections of ore grindings, adopts a cluster cyclone of Φ 150mm to carry out classification, adopt Φ 3.8 × 11m overflowball mill ore grinding), after three sections of ore grindings, discharge returns and again enters three sections of classifications, overflow after three sections of classifications enters into next step, the ore discharge fineness control-0.025mm after three sections of ore grindings account for 90%(working control more than 90% all can);
(5) overflow after above-mentioned three sections of classifications is entered to Φ 24m modified thickener and carry out two sections of deslimings, a little less than underflow after two sections of deslimings carries out, magnetic is roughly selected and is obtained rough concentrate, mine tailing after weak magnetic is roughly selected enters Φ 22m modified thickener and carries out three sections of deslimings, underflow after three sections of deslimings enters Φ 16m thickener and carries out four sections of deslimings, and after four sections of deslimings, underflow enters follow-up flotation operation.
The whole merging of overflow after above-mentioned two sections of deslimings, three sections of deslimings, four sections of deslimings are made sludge product and are carried out subsequent treatment.
In the embodiment of the invention described above, each section of ore grinding operation before desliming is all the closed circuit grinding systems (syllogic) that adopt cyclone-ball mill composition, be that primary grinding, secondary grinding, three sections of ore grindings all adopt ball mill to carry out ore grinding, one section of classification, two sections of classifications, three sections of classifications all adopt cyclone to carry out classification.Wherein, the draw ratio of three sections of ore grinding ball mills is that the draw ratio of mono-, two sections of 2.89(is 2.0).The milling medium adopting in primary grinding is the steel ball of addition 42%, and the milling medium adopting in secondary grinding and three sections of ore grindings is steel section, and steel section is biplane round platform shaped steel section.In secondary grinding, the proportioning of the steel section of different size is Φ 45 × 50: Φ 30 × 35: Φ 20 × 25=4: 4: 2, charging quantity was 35%; In three sections of ore grindings, the proportioning of the steel section of different size is Φ 30 × 35: Φ 20 × 25=8: 2, and charging quantity is 30%.
In the embodiment of the invention described above, one section of desliming, two sections of deslimings, three sections of deslimings, four sections of deslimings, five sections of deslimings all adopt selective flocculation to remove slime technique, in selective flocculation to remove slime process, pH value is all controlled at 9～10, the pH adjusting agent adopting when pH value is controlled is NaOH, and the consumption of NaOH is by 1.48kg/t.In each section of selective flocculation to remove slime process, the flocculant of employing is humic acid amide, and the consumption of humic acid amide is 0.86kg/t.In the present embodiment, the feed ore concentration while controlling each section of desliming is that 12%～20%(sees the following form 1), underflow density is that 30%～50%(sees the following form 1).
The desliming device of each section of desliming employing is modified thickener of the present invention.As Fig. 3, shown in Fig. 4, this modified thickener comprises that thickener pond body 1(can be steel construction or xoncrete structure etc.), thickener pond body 1 is class cylindrical shape (top cylinder+bottom inverted cone), the ore pulp of thickener pond body 1 is arranged on the top of pool center to entrance 5, the periphery top of thickener pond body 1 arranges downflow weir 2, the bottom of thickener pond body 1 is provided with the harrow frame 3 to spigot 11 places at the bottom of pond by the ore pulp cleaning depositing in pond, harrow frame 3 is a set of steel rakes around thickener pond body 1 center automatic rotation by central rotating shaft transmission, it harrows the body 1 denseer ore pulp in surrounding bottom in thickener pond hold together to centre, ore pulp is flowed away from spigot 11, improve the thickening efficiency of desliming device.
Be provided with annular water inlet pipe 8 in the horizontal central area of the present embodiment modified thickener, annular water inlet pipe 8 is connected with two annular conduits 4 along the radially-arranged diverging water-supply-pipe 9 of thickener pond body 1 by eight, two annular conduits 4 are on the height and position between overflow liquid level and harrow frame 3, comprise outer shroud water pipe 42 and interior ring water pipe 43, on outer shroud water pipe 42 and interior ring water pipe 43, all offer multiple directions delivery port 41 upward, the multiple delivery ports 41 on same annular conduit are evenly laid on annular conduit 4 around pool center axis.In the present embodiment, on outer shroud water pipe 42 and interior ring water pipe 43, by being set, inverted T-shaped tube connector 44 make 41 points of delivery ports be located at the inside and outside both sides of annular conduit, to produce better ascending current.Annular conduit 4 along continuous straight runs are laid, and are connected and fixed by bracing frame 7 and crane span structure 6 with the water-supply-pipe 9 of its radial communication.In the present embodiment, the laying mode of annular conduit is conducive to guarantee that the water yield and the hydraulic pressure of each delivery port 41 places output on outer shroud water pipe 42 and interior ring water pipe 43 are in a basic balance or equal, to ensure that the external force vertically upward that ascending water provides upwards keeps basically identical in week.
In the modified thickener of the present embodiment, outer shroud water pipe 42 and interior ring water pipe 43 have different diameter (diameter of outer shroud water pipe 42 is greater than interior ring water pipe 43), the central axis of each annular conduit 4 of different-diameter all with the central axes of thickener pond body 1.If the internal diameter of thickener pond body 1 is D, the diameter of outer shroud water pipe 42 is d1, and the diameter of interior ring water pipe 43 is d2, has d1/D=75%～85%, desirable d1/D=80%, d2/D=60% in d2/D=50%～60%(the present embodiment).If the degree of depth of thickener pond body 1 is H, outer shroud water pipe 42 and the degree of depth of interior ring water pipe 43 in thickener pond body 1 are h, have desirable h/H=20% in h/H=15%～25%(the present embodiment).
The annular conduit 4 of the present embodiment is height-adjustable water pipe, can realize by apparatus for automatically lifting the adjusting of height.Flow in annular conduit 4 can be by valve regulated control.The annular conduit 4 of different-diameter also can be arranged in thickener pond body 1 on differing heights position, forms steppedly, and reduces gradually from body 1 center, thickener pond to periphery height radially.
The operation principle of the present embodiment modified thickener is mainly reflected in: the modified thickener of the present embodiment increases and is provided with annular conduit system in existing thickener pond body 1, this annular conduit system makes in thickener pond body 1 along circumferentially producing evenly, stable ascending current, under the effect of ascending current, the sludge particle that ore pulp feeds to entrance 5 is by being originally only subject to gravity He Yin center to change into and be subject to gravity to the dual function of the raw horizontal thrust to downflow weir direction of mineral products, the triple role (referring to Fig. 4) of the external force vertically upward that horizontal thrust and ascending water provide, sludge particle in ascending current top is subject to (being less than or being greater than gravity) External Force Acting straight up, the speed of its downward sedimentation diminishes or even then move upward.Visible, due to the effect of ascending water, change the movement locus of sludge particle, reduce sludge particle in the possibility that approaches downflow weir 2 near zone sedimentations, make in the ore pulp (being sand setting) at the bottom of sludge particle is not sneaked into pond, improve the quantity that sludge particle flows away from downflow weir 2, thereby improved the desliming efficiency of thickener.
The modified thickener of the present embodiment is in running, and the feed ore concentration to equipment, effluent concentration, overflow grade are carried out Real-Time Monitoring as required; The water supply pressure of annular conduit 4, flow need evenly, stablize, and can regulate water flow according to above-mentioned Real-Time Monitoring result.
As shown in table 1, after one section of desliming, iron grade has risen 6.73%, although mine tailing productive rate is higher, but grade is only 11.93%, lower than total Iron Grade of Tailings (14.17%), and iron recovery reduces not obvious, both reach the object of removing sludge, gangue mineral, ensured again the rate of recovery of iron.Through two sections～tetra-sections deslimings, the grade of iron can progressively rise, and iron mineral is less with mud loss.Desliming productive rate is more than 50%, and desliming is effective.
Table 1: the mineral processing index after each section of desliming
Concentrate after desliming enters reverse flotation work, finally can obtain the good mineral processing index of iron concentrate grade as shown in table 2 63.00%, the rate of recovery 64.00%.
Table 2: the mineral processing index after reverse flotation work
| Name of product | Productive rate (%) | Grade (TFe%) | The rate of recovery (%) |
| Iron ore concentrate | 28.57 | 63.00 | 64.00 |
| Mine tailing | 71.43 | 14.17 | 36.00 |
| Raw ore | 100.00 | 28.12 | 100.00 |
Claims (7)
1. a combination desliming process that can be used for ore dressing, comprises the following steps:
(1) the ore product after fragmentation is first carried out to primary grinding, the discharge after primary grinding carries out one section of classification, and the underflow after one section of classification returns and again enters primary grinding, and the overflow after one section of classification enters into next step; Described ore product refers to microfine iron ore, and described microfine iron ore is the mixing ore deposit as leading taking magnetic iron ore and bloodstone, and the disseminated grain size of described microfine iron ore is 2 μ m～30 μ m; The feed preparation unit size of described primary grinding is below 10mm; The ore discharge fineness control-0.074mm of described primary grinding accounts for 75%～80%;
(2) two sections of classifications are carried out in the overflow after above-mentioned one section of classification, and the underflow after two sections of classifications carries out secondary grinding, and the discharge after secondary grinding returns and again enters two sections of classifications, and the overflow after two sections of classifications enters into next step; The ore discharge fineness control-0.048mm of described secondary grinding accounts for more than 85%;
(3) overflow after two sections of classifications is carried out to low intensity magnetic separation, magnetic tailing after low intensity magnetic separation through concentrated, every slag, high intensity magnetic separation processing, described high intensity magnetic separation is as one section of desliming, the magnetic concentrate after low intensity magnetic separation and high intensity magnetic separation carries out three sections of classifications;
Underflow after (4) three sections of classifications carries out three sections of ore grindings again, and after three sections of ore grindings, discharge returns and again enters three sections of classifications, and the overflow after three sections of classifications enters into next step; Ore discharge fineness control-0.025mm after described three sections of ore grindings accounts for more than 85%;
(5) overflow after above-mentioned three sections of classifications is carried out to two sections of deslimings, a little less than the underflow after two sections of deslimings carries out, magnetic is roughly selected and is obtained rough concentrate, and the mine tailing after weak magnetic is roughly selected carries out follow-up three sections of deslimings or four sections of desliming processing more than desliming;
Each section of desliming after described step (4) processed and all adopted selective flocculation to remove slime technique, and the desliming device of each section of desliming employing is thickener;
Described primary grinding, secondary grinding, three sections of ore grindings all adopt ball mill to carry out ore grinding, and described one section of classification, two sections of classifications, three sections of classifications all adopt cyclone to carry out classification, and described ore grinding and classification are all to carry out in closed circuit grinding system.
2. the combination desliming process that can be used for ore dressing according to claim 1, is characterized in that: in described selective flocculation to remove slime process, pH value is controlled at 9～10; The pH adjusting agent adopting when described pH value is controlled is NaOH, and the consumption of described NaOH is by 1.2kg/t～1.5kg/t; In described selective flocculation to remove slime process, the flocculant of employing is humic acid amide, and the consumption of humic acid amide is 0.75 kg/t～0.9 kg/t; In described selective flocculation to remove slime process, the feed ore concentration while controlling each section of desliming is 12%～20%, and underflow density is 30%～50%.
3. the combination desliming process that can be used for ore dressing according to claim 1, it is characterized in that: described thickener is modified thickener, it comprises thickener pond body, the periphery of thickener pond body arranges downflow weir, the bottom of thickener pond body is provided with the harrow frame to spigot place at the bottom of pond by the ore pulp cleaning depositing in pond, on the height and position between described modified thickener overflow liquid level and described harrow frame, be provided with water pipe, on water pipe, offer the delivery port being directed upwardly; The top of described thickener pond body is provided with crane span structure, and described water pipe is connected in crane span structure below.
4. the combination desliming process that can be used for ore dressing according to claim 3, is characterized in that: described thickener pond body is cylindrical shape, and described water pipe is annular conduit, is evenly laid with multiple delivery ports on described annular conduit; The quantity of described annular conduit is more than two, and each annular conduit has different diameters, the central axis of the annular conduit of described different-diameter all with thickener central axes.
5. the combination desliming process that can be used for ore dressing according to claim 4, it is characterized in that: the quantity of described annular conduit is two, if the internal diameter of described thickener pond body is D, the diameter of major diameter annular conduit is d1, the diameter of minor diameter annular conduit is d2, there is d1/D=75%～85%, d2/D=50%～60%; If the degree of depth of described thickener pond body is H, two described annular conduits fitting depth in the body of thickener pond is h, has h/H=15%～25%.
6. according to the combination desliming process that can be used for ore dressing described in any one in claim 1～5, it is characterized in that: the draw ratio of the ball mill that described three sections of ore grindings adopt is 2.5～3.0, the milling medium adopting in described primary grinding is steel ball, the milling medium adopting in described secondary grinding and three sections of ore grindings is steel section, and the charging quantity of described steel section is 20%～40% of described ball mill barrel volume.
7. the combination desliming process that can be used for ore dressing according to claim 6, is characterized in that: described steel section is biplane round platform shaped steel section, and the diameter of described steel section is Φ 20mm～Φ 45mm; In described secondary grinding, the proportioning of the steel section of different size is Φ 45 × 50: Φ 30 × 35: Φ 20 × 25=3.5～4.5: 3.5～4.5: 1～3; In described three sections of ore grindings, the proportioning of the steel section of different size is Φ 30 × 35: Φ 20 × 25=7～9: 1～3.
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| CN103386361B (en) * | 2013-08-02 | 2016-05-11 | 长沙矿冶研究院有限责任公司 | The beneficiation method of the red mixing iron ore of a kind of magnetic |
| CN103934094A (en) * | 2014-03-26 | 2014-07-23 | 长沙矿冶研究院有限责任公司 | Mineral processing process of low-grade micro-fine particle embedded iron ore hard to choose |
| CN103962214B (en) * | 2014-06-03 | 2015-08-19 | 中冶沈勘秦皇岛工程技术有限公司 | A kind of beneficiation combined method method and system of synthetical recovery association iron Phosphate minerals |
| CN105195304A (en) * | 2015-07-24 | 2015-12-30 | 石家庄金垦科技有限公司 | Sorting process for improving quality and reducing impurities of low-grade magnetite concentrate |
| CN111036388B (en) * | 2018-10-11 | 2022-03-22 | 中蓝连海设计研究院有限公司 | Washing and grading flotation method for weathered phosphate ore |
| BR112021009318A2 (en) * | 2018-11-14 | 2021-08-17 | IB Operations Pty Ltd | method and apparatus for processing magnetite |
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