CN102806138A - 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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- CN102806138A CN102806138A CN2012102943909A CN201210294390A CN102806138A CN 102806138 A CN102806138 A CN 102806138A CN 2012102943909 A CN2012102943909 A CN 2012102943909A CN 201210294390 A CN201210294390 A CN 201210294390A CN 102806138 A CN102806138 A CN 102806138A
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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 technology of ore, relate in particular to a kind of combination desliming technology 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, and is promptly 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 mainly is poor, thin, assorted refractory iron ore, and utilization rate is low at present.Under such background, it is more and more important fully to develop existing iron ore.And to develop this part ore resource, just must carry out fragmentation, fine grinding, with the monomer dissociation of abundant realization valuable mineral to ore.Yet in the process of fine grinding, because there is difference in the grindability of different minerals, the process characteristic of fine grinding the argillization phenomenon can occur usually in addition.The follow-up floatation indicators of generation meeting severe exacerbation of sludge; Because the particle in the sludge is generally micro-size fraction; Difficulty is attached to bubble surface and forms mineralized froth layer emersion; Opposite its is attached to the coarse granule surface more easily and forms the sludge cover cap, can significantly reduce the selectivity of reverse flotation process and the floatability of coarse granule gangue mineral like this.In addition, the specific surface of sludge and surface can be big, can consume a large amount of floating agents, increase beneficiation cost.In a word, the existence of sludge all has direct influence to grade, the rate of recovery of flotation concentrate, so as the attendant phenomenon of fine grinding process, something must be done in the industry eliminates the influence of sludge to follow-up sorting operation.
Handle the measure of sludge, common have the dispersion of the ore pulp of reinforcement, classification, a desliming etc.Wherein, adopting the method removal sludge of desliming is more common way.The selective flocculation desliming is to form the technology that the iron mineral floc sedimentation realizes that ore and sludge effectively separate through " bridging " effect; It both can remove the most of sludge in the iron ore; Thereby eliminate the adverse effect of sludge, can also improve the grade of iron, and guarantee that iron mineral can be with the mud heavy losses follow-up ore dressing process; Investment cost is low, can handle the fine fraction mineral preferably.
The equipment that is used for desliming, common have hydrocyclone, thickener, various desliming buckets etc.Cyclone is a kind of efficient simple desliming device; Have equipment take up an area of little, treating capacity big, the characteristics 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 influences such as feed ore concentration and pressure, fluctuates easily; Be difficult to guarantee the continuity of producing, so influence the stability of the mineral processing index of whole flow process.And cyclone is not suitable for adopting the flocculation Desliming method.Desliming bucket separate unit treating capacity is less, and is difficult to control on producing.For the beneficiation flowsheet of three sections of needs or above desliming processing, the instability of single hop desliming can influence whole desliming effect, so equipment operation rate is difficult to guarantee.
Be the iron ore resource of fine grain teeth cloth to valuable mineral, need carry out the grinding operation more than three sections or three sections usually, and between every section grinding operation, also often need carry out desliming, follow-up sorting operation is exerted an influence to prevent primary mud and secondary mud.Before ore pulp gets into relevant sorting operation, often also need carry out desliming, to reduce the influence of sludge to concentrate grade.Characteristics based on this type ore resource; Desliming highlights gradually and is an important operation step in the whole process program; Reasonably the desliming scheme has increased through ore dressing and has realized the feasibility that relevant resource synthetic development utilizes, and does not also have industrial practice at home and abroad but carry out three sections or above selective flocculation desliming technology with thickener as desliming device.Therefore, studying and improve existing desliming scheme selects the poor iron ore resource that crucial directive significance is arranged for the abundant fine fraction difficulty of exploitation China reserves.
Summary of the invention
Carry out one section desliming one, between secondary grinding and three sections ore grindings; Carrying out follow-up desliming behind three sections ore grindings again handles; Desliming stage by stage like this is basic ideas of removing the sludge of stage grinding generation; But different phase adopts same desliming technology often can not reach is difficult to purpose; The present invention overcomes the deficiency of prior art, according to the ore grinding stage and to the material of size fractionated, provides that a kind of cost of investment is lower, floor space is little, the production easy maintenance, adaptability is strong, desliming is effective and the stability and the successional combination desliming technology that can be used for ore dressing that help guaranteeing producing.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of combination desliming technology that can be used for ore dressing, may further comprise the steps:
(1) the ore product after the fragmentation is carried out primary grinding earlier, the discharge behind the primary grinding carries out one section classification, and the underflow after one section classification returns and gets into primary grinding once more, and the overflow after one section classification enters into next step;
(2) two sections classifications are carried out in the overflow after above-mentioned one section classification, and the underflow after two sections classifications carries out secondary grinding, and the discharge behind the secondary grinding returns and gets into two sections classifications once more, and the overflow after two sections classifications enters into next step;
(3) low intensity magnetic separation is carried out in the overflow after two sections classifications, the magnetic tailing after the low intensity magnetic separation is through concentrating, handling at a distance from slag, high intensity magnetic separation, and said high intensity magnetic separation is promptly as one section desliming, and the magnetic concentrate behind low intensity magnetic separation and the high intensity magnetic separation carries out three sections classifications;
Underflow after (4) three sections classifications carries out three sections ore grindings again, and discharge returns and gets into three sections classifications once more behind three sections ore grindings, and the overflow after three sections classifications enters into next step;
(5) two sections deslimings are carried out in the overflow after above-mentioned three sections classifications, the underflow after two sections deslimings carries out weak magnetic to be roughly selected and obtains rough concentrate, and the mine tailing after weak magnetic is roughly selected carries out follow-up three sections deslimings or four sections above deslimings of desliming to be handled;
Each section desliming after the said step (4) is handled and is all adopted selective flocculation desliming technology, and the desliming device that each section desliming is adopted is thickener.The overflow that concentrates in the said step (3), the overflow after oversize material, high intensity magnetic separation mine tailing and each section desliming of slag all can merge as mine tailing to be handled.(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 is meant the combination of high intensity magnetic separation desliming method and selective flocculation desliming method.Wherein, the purpose of low intensity magnetic separation is to reclaim strongly magnetic mineral as early as possible, prevents a large amount of existence of strongly magnetic mineral and is unfavorable for the high intensity magnetic separation operation; The purpose that concentrates then 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 the part sludge simultaneously; Purpose at a distance from slag is to remove coarse granule, prevents the situation that high intensity magnetic separation stops up, and in other words, low intensity magnetic separation, concentrated and separated slag all are the preparation works for high intensity magnetic separation.The purpose of said high intensity magnetic separation then is to reclaim weak magnetic mineral, and plays the effect of the sludge of removing primary mud and one, secondary grinding generation simultaneously; The purpose that follow-up two sections, the desliming more than three sections are handled mainly is to remove the sludges that produce in three sections ore grindings (fine grinding).
The above-mentioned combination desliming technology that can be used for ore dressing, in the said selective flocculation desliming process, the pH value preferably is controlled at 9～10.In the said selective flocculation desliming process, the pH adjustment agent of adopting when said pH value is controlled is preferably NaOH, and the consumption of said NaOH is preferably by 1.2kg/t～1.5kg/t (representing the NaOH quality that add in surplus ore deposit per ton).In the said selective flocculation desliming process, the flocculant of employing is preferably the humic acid amide, and the consumption of humic acid amide is preferably 0.75kg/t～0.9kg/t (quality of representing the humic acid amide that add in surplus ore deposit per ton).In the said selective flocculation desliming process; Feed ore concentration when controlling each section desliming (give and do the shared mass percent in ore deposit in the ore pulp in ore deposit) is preferably 12%～20%, and underflow density (being to do the shared mass percent in ore deposit after the desliming in the ore pulp) is preferably 30%～50%.
In the above-mentioned combination desliming technology; As further improvement; Said 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), and the periphery of thickener pond body is provided with downflow weir, and the bottom of thickener pond body is provided with the rake frame with spigot place at the bottom of ore pulp cleaning to the pond that deposits in the pond; On the height and position between said modified thickener overflow liquid level and the said rake frame, be provided with water pipe, offer the delivery port that is directed upwardly on the water pipe.The top of said thickener pond body preferably is provided with a crane span structure, and said water pipe is connected in the crane span structure below.Said water pipe is preferably adjustable height type water pipe.Realize that adjustable for height apparatus and method can be selected to install according to demand in practice by those skilled in the art voluntarily.
As to the improvement further of above-mentioned modified thickener; Said 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 said water pipe, even on the said annular conduit (or equidistantly) is laid with a plurality of delivery ports.A plurality of delivery ports on the same annular conduit preferably are laid on the annular conduit around the central axis (vertically) of annular conduit evenly and at intervals.The quantity of said annular conduit is preferably more than two, and each annular conduit has different diameters, the central axis of the annular conduit of said different-diameter all with the central axes of thickener.Preferred, the quantity of said annular conduit is two, comprises two annular conduits of large and small different-diameter (diameter of annulus); If the internal diameter of said thickener pond body is D, the diameter of major diameter annular conduit is that (the pipe section size is not promptly considered to the distance of central axis in the pipe section center of circle to d1; Down together); The diameter of minor diameter annular conduit is d2, and d1/D=75%～85% is then arranged, d2/D=50%～60%.Preferred, the degree of depth of establishing said thickener pond body is H, and the fitting depth (apart from the height of overflow liquid level) of two said annular conduits in the body of thickener pond is h, and h/H=15%～25% is then arranged.The annular conduit of said different-diameter also can preferably be arranged in the body of thickener pond and to form steppedly on the differing heights position, and reduces (being that the degree of depth increases gradually) by the rotating shaft of thickener pond body highly gradually toward periphery.
In the above-mentioned modified thickener, through being set, the inverted T-shaped tube connector make said delivery port branch be located at the inside and outside both sides of annular conduit on the said annular conduit, to produce ascending current better.The ore pulp of said thickener pond body preferably is arranged on the top of pool center for inlet.
The operation principle of preferred modified thickener mainly is among the present invention: in the combination desliming technology of the present invention; Big to the mine treatment scale, as to need the larger-diameter thickener of employing to carry out desliming situation; In sedimentation time one timing; Because the radius of thickener is bigger, sludge need pass through the downflow weir that long horizontal throw could arrive the thickener periphery, and sludge possibility no show downflow weir is just in the near zone sedimentation near downflow weir; The present invention is through improving desliming device; In the body of thickener pond, set up annular conduit; This makes the sludge particle become the triple role that receives the external force vertically upward that gravity, horizontal thrust and ascending water provide by the horizontal thrust effect to the downflow weir direction that originally only received gravity and give birth to mineral products because of the center; This further makes the sinking speed of sludge particle in water slow down; Movement locus changes, and vertical stroke is littler in certain sedimentation time, to guarantee having more sludge particles can reach the downflow weir place and be collected.In the running of desliming device of the present invention, can monitor (but also manual sampling monitoring) in real time to feed ore concentration, effluent concentration, the overflow grade of desliming device; The water supply pressure of water pipe, flow are wanted evenly, are stablized, and can adjust automatically water flow according to the monitoring situation of overflow and underflow.
The above-mentioned combination desliming technology that can be used for ore dressing, said ore product preferably is meant the microfine iron ore, and said microfine iron ore is to be master's mixing ore deposit with magnetic iron ore and bloodstone, and the disseminated grain size of said microfine iron ore is generally 2 μ m～30 μ m.The feed preparation unit size of said primary grinding is controlled at below the 10mm.
The above-mentioned combination desliming technology that can be used for ore dressing, said primary grinding, secondary grinding, three sections ore grindings all preferably adopt ball mill to carry out ore grinding.The above-mentioned selective flocculation multistage desliming technology that can be used for ore dressing, said one section classification, two sections classifications, three sections classifications all preferably adopt cyclone to carry out classification.Said ore grinding and classification all are in the closed circuit grinding system, to carry out, and for example, one section closed circuit grinding system is formed in primary grinding and one section classification.
The above-mentioned combination desliming technology that can be used for ore dressing, the draw ratio of the ball mill that said three sections ore grindings adopt is preferably 2.5～3.0.The milling medium that adopts in the said primary grinding is a steel ball, and the milling medium that adopts in said secondary grinding and the three sections ore grindings is the steel section, and the charging quantity of said steel section is 20%～40% of a said ball mill barrel volume.
The above-mentioned combination desliming technology that can be used for ore dressing, said steel section is preferably biplane round platform shaped steel section.The diameter of said steel section is Φ 20mm～45mm; The proportioning of the steel section of different size is Φ 45 * 50: Φ 30 * 35 in the said secondary grinding: Φ 20 * 25=3.5～4.5: 3.5～4.5: 1～3; The proportioning of the steel section of different size is Φ 30 * 35 in said three sections ore grindings: Φ 20 * 25=7～9: 1～3.
The above-mentioned combination desliming technology that can be used for ore dressing, the ore discharge fineness of said primary grinding preferably controls-and 0.074mm accounts for 75%～80%; The ore discharge fineness of said secondary grinding preferably controls-and 0.048mm accounts for more than 85%; Said three sections ore grindings adopt the cyclone of Φ 150mm to carry out cyclone classification, and the ore discharge fineness behind three sections ore grindings preferably controls-and 0.025mm accounts for more than 85%.
Compared with prior art, the invention has the advantages that:
1. the present invention adopts the desliming technology of high intensity magnetic separation and selective flocculation combination; High intensity magnetic separation is used for handling-sludge of 0.074mm grade material, and selective flocculation is used for handling-sludge of 0.037mm grade material, make desliming device with intensity magnetic separator and modified thickener respectively; Carry out multistage (preferred four sections) desliming; Removed the secondary mud that primary mud and ore grinding produce, the grade of iron has a distinct increment after the desliming, and iron mineral is less with the mud loss; The desliming productive rate reaches more than 50%, has eliminated sludge to the particularly influence of reverse flotation work of flotation.
2. the present invention makes the desliming device of pan feeding for-0.074mm grade with intensity magnetic separator, and is easy to operate, easy to control, removed sludge and gangue mineral when guaranteeing weak magnetic recovery; The present invention also preferably with the modified thickener as pan feeding be-desliming device of 0.074mm grade, and steadily not reliably, easy maintenance has adaptability preferably to the fluctuation of ore-sorting system, makes process system have bigger flexibility and adaptability.
3. after desliming optimal process of the present invention is applied to the ore dressing of iron ore, removed the secondary mud that primary mud and fine grinding produce, the grade of iron has a distinct increment after the desliming, and iron mineral is less with the mud loss, and this provides the raw material of high-quality more for follow-up sorting operation.
4. adjust agent with NaOH as pH in the preferred desliming technology of the present invention, as flocculant, the desliming effect that it has guaranteed selective flocculation technology is a kind of economically viable medicament assembled scheme with the humic acid amide.
5. also adopted a kind of modified thickener simple in structure, easy for installation in the preferred desliming technology of the present invention; It has changed the movement locus of sludge in thickener desliming process through the method that increases ascending current; Make the sludge particle downflow weir that flows to as much as possible, improved the desliming effect; This modified thickener can be adjusted the flow of ascending current according to the result that feed ore concentration, effluent concentration and the overflow grade of desliming device are monitored in real time automatically, can dynamically control the desliming process; Its successful Application not only can be enriched the selection space of desliming device, and can promote the selective flocculation method, combines the application prospect of concentrated type desliming device in the mineral dressing and desliming field.
Generally speaking, technical scheme of the present invention has been filled up and has been adopted the blank of carrying out the multistage desliming more than three sections or three sections in this area, has good desliming effect.Technical scheme of the present invention is one of important step of development and use microfine iron ore resource overall technology; To adopting Desliming method to remove the secondary mud of primary mud and the generation of fine grinding process in the industry and, all having the positive meaning of ten minutes for follow-up flotation (particularly reverse flotation) provides qualified raw material, also finally obtains qualified concentrate product.
Description of drawings
Fig. 1 is for being used for the process chart of the selective flocculation multistage desliming technology of ore dressing in the embodiment of the invention.
Fig. 2 is the process chart of preferred compositions desliming technology of the present invention.
Fig. 3 is the main TV structure sketch map of modified thickener in the embodiment of the invention.
Fig. 4 be among Fig. 3 the modified thickener at the cutaway view at A-A place.
Marginal data:
1. thickener pond body; 11. spigot; 2. downflow weir; 3. rake frame; 4. annular conduit; 41. delivery port; 42. outer shroud water pipe; 43. interior ring water pipe; 44. inverted T-shaped tube connector; 5. ore pulp is given inlet; 6. crane span structure; 7. bracing frame; 8. annular water inlet pipe; 9. water-supply-pipe.
The specific embodiment
Below in conjunction with Figure of description and specific embodiment the present invention is further described.
Embodiment:
A kind of combination desliming technology that is used for ore dressing of the present invention as shown in Figure 1 may further comprise the steps:
(1) certain the microfine iron ore that is controlled at below the 10mm through the product granularity after the fragmentation (is supposed production scale 2,300,000 t/a; Iron mineral mainly is made up of magnetic iron ore, bloodstone and a small amount of martite; And with magnetic iron ore is main; Head grade is about 28%; The valuable mineral disseminated grain size is 2 μ m～30 μ m mostly) carry out primary grinding (Φ 500mm * 6 cyclone group-Φ, 4.5 * 9m overflowball mill), the discharge behind the primary grinding carries out one section classification, and the underflow after one section classification returns and gets into primary grinding once more; Overflow after one section classification enters into next step, and the ore discharge fineness control-0.074mm of primary grinding accounts for 76% (working control more than 76% all can);
(2) two sections classifications are carried out in the overflow after above-mentioned one section classification; Underflow after two sections classifications carries out secondary grinding (Φ 350mm * 10 cyclone group-Φ, 4.5 * 9m overflowball mill); Discharge behind the secondary grinding returns and gets into two sections classifications once more; Overflow after two sections classifications enters into next step, and the ore discharge fineness control-0.048mm of secondary grinding accounts for 90% (working control more than 90% all can);
(3) low intensity magnetic separation is carried out in the overflow after above-mentioned two sections classifications; Magnetic tailing after the low intensity magnetic separation is through concentrating (Φ 30m modified thickener), handling (SLon-2000 intensity magnetic separator) at a distance from slag (SL-2000 drum sieve), high intensity magnetic separation; High intensity magnetic separation has the treatment effect of one section desliming, and the magnetic concentrate behind low intensity magnetic separation and the high intensity magnetic separation carries out three sections classifications; Oversize material, the high intensity magnetic separation of the overflow that concentrates, separated slag scanned mine tailing and done the mine tailing processing;
Underflow after (4) three sections classifications carries out three sections ore grindings again and (adopts the cyclone group of Φ 150mm to carry out classification in three sections ore grindings; Adopt Φ 3.8 * 11m overflowball mill ore grinding); Discharge returns and gets into three sections classifications once more behind three sections ore grindings; Overflow after three sections classifications enters into next step, and the ore discharge fineness control-0.025mm behind three sections ore grindings accounts for 90% (working control more than 90% all can);
(5) Φ 24m modified thickener is advanced in the overflow after above-mentioned three sections classifications and carry out two sections deslimings; Underflow after two sections deslimings carries out weak magnetic and roughly selects and obtain rough concentrate; Mine tailing after weak magnetic is roughly selected advances Φ 22m modified thickener and carries out three sections deslimings; Underflow after three sections deslimings advances Φ 16m thickener and carries out four sections deslimings, and underflow gets into follow-up flotation operation after four sections deslimings.
Overflow after above-mentioned two sections deslimings, three sections deslimings, the four sections deslimings all merges to be made the sludge product and carries out subsequent treatment.
Among the embodiment of the invention described above; Each section ore grinding operation before the desliming all is the closed circuit grinding systems (syllogic) that adopt cyclone-ball mill to form; Be that primary grinding, secondary grinding, three sections ore grindings all adopt ball mill to carry out ore grinding, one section classification, two sections classifications, three sections classifications all adopt cyclone to carry out classification.Wherein, the draw ratio of three sections ore grinding ball mills is 2.89 (one, two section draw ratio is 2.0).The milling medium that adopts in the primary grinding is the steel ball of addition 42%, and the milling medium that adopts in secondary grinding and the three sections ore grindings is the steel section, and the steel section is a biplane round platform shaped steel section.The proportioning of the steel section of different size is Φ 45 * 50: Φ 30 * 35 in the secondary grinding: Φ 20 * 25=4: 4: 2, charging quantity was 35%; The proportioning of the steel section of different size is Φ 30 * 35 in three sections ore grindings: Φ 20 * 25=8: 2, and charging quantity is 30%.
Among the embodiment of the invention described above; Selective flocculation desliming technology is all adopted in one section desliming, two sections deslimings, three sections deslimings, four sections deslimings, five sections deslimings; In selective flocculation desliming process; The pH value all is controlled at 9～10, and the pH adjustment agent of adopting during the control of pH value is NaOH, and the consumption of NaOH is by 1.48kg/t.In each section selective flocculation desliming process, the flocculant of employing is the humic acid amide, and the consumption of humic acid amide is 0.86kg/t.In the present embodiment, the feed ore concentration when controlling each section desliming is 12%～20% (seeing the following form 1), and underflow density is 30%～50% (seeing the following form 1).
The desliming device that each section desliming is adopted is modified thickener of the present invention.Like Fig. 3, shown in Figure 4; This modified thickener comprises thickener pond body 1 (can be steel construction or xoncrete structure etc.); Thickener pond body 1 type of being cylindrical shape (top cylinder+bottom inverted cone); The ore pulp of thickener pond body 1 is arranged on the top of pool center for inlet 5, and the peripheral top of thickener pond body 1 is provided with downflow weir 2, and the bottom of thickener pond body 1 is provided with the rake frame 3 with spigot 11 places at the bottom of ore pulp cleaning to the pond that deposits in the pond; Rake frame 3 is cover steel rakes by the automatic rotation in body 1 center around the thickener pond of central rotating shaft transmission; It harrows the denseer ore pulp in bottom around the thickener pond body 1 hold together to the centre, and ore pulp is flowed away from spigot 11, improves the thickening efficiency of desliming device.
Be provided with annular water inlet pipe 8 in the horizontal center zone of present embodiment modified thickener; Body 1 radially-arranged diverging water-supply-pipe 9 is connected with two annular conduits 4 annular water inlet pipe 8 along the thickener pond through eight; Two annular conduits 4 are on the height and position between overflow liquid level and the rake frame 3; Comprise outer shroud water pipe 42 and interior ring water pipe 43; All offer a plurality of delivery ports that are directed upwardly 41 on outer shroud water pipe 42 and the interior ring water pipe 43, a plurality of delivery ports 41 on the same annular conduit evenly are laid on the annular conduit 4 around the pool center axis.In the present embodiment, through being set, inverted T-shaped tube connector 44 make delivery port be located at the inside and outside both sides of annular conduit in 41 minutes on outer shroud water pipe 42 and the interior ring water pipe 43, to produce ascending current better.Annular conduit 4 along continuous straight runs are laid, and are connected fixing with crane span structure 6 through bracing frame 7 with the water-supply-pipe 9 of its radial communication.The laying mode of annular conduit helps guaranteeing that the water yield and the hydraulic pressure of each delivery port 41 places output on outer shroud water pipe 42 and the interior ring water pipe 43 are in a basic balance or equal in the present embodiment, upwards keeps basically identical to guarantee the external force vertically upward that ascending water provides in week.
In the modified thickener of present embodiment, outer shroud water pipe 42 has different diameter (diameter of outer shroud water pipe 42 is greater than interior ring water pipe 43) with 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, and d1/D=75%～85% is then arranged, and d2/D=50%～60% (desirable d1/D=80% in the present embodiment, d2/D=60%).If the degree of depth of thickener pond body 1 is H, outer shroud water pipe 42 is h with the degree of depth of interior ring water pipe 43 in thickener pond body 1, and h/H=15%～25% (desirable h/H=20% in the present embodiment) is then arranged.
The annular conduit 4 of present embodiment is an adjustable height type water pipe, can realize the adjusting of height through apparatus for automatically lifting.Flow in the annular conduit 4 can be controlled by valve regulated.The annular conduit 4 of different-diameter also can be arranged in the thickener pond body 1 on the differing heights position, form stepped, and from the thickener pond body 1 center to periphery height radially reduces gradually.
The operation principle of present embodiment modified thickener is mainly reflected in: the modified thickener of present embodiment increases in existing thickener pond body 1 and is provided with the annular conduit system; This annular conduit system makes in the thickener pond body 1 along circumferentially producing even, stable ascending current; Under the effect of ascending current; Ore pulp is changed into the triple role (referring to Fig. 4) that receives the external force vertically upward that gravity, horizontal thrust and ascending water provide for sludge particle that inlet 5 feeds by the dual function to the horizontal thrust of downflow weir direction that originally only receives gravity and give birth to mineral products because of the center; The sludge particle that is in ascending current top receive straight up (less than or greater than gravity) the external force effect, the speed of its downward sedimentation diminishes or even then moves upward.It is thus clear that; Because the effect of ascending water; Changed the movement locus of sludge particle, reduced the sludge particle, made in the ore pulp (being sand setting) at the bottom of the sludge particle is not sneaked into the pond in possibility near downflow weir 2 near zone sedimentations; Improve the quantity that the sludge particle flows away from downflow weir 2, thereby improved the desliming efficient of thickener.
The modified thickener of present embodiment can be monitored feed ore concentration, effluent concentration, the overflow grade of equipment in running as required in real time; 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, the iron grade has risen 6.73% after one section desliming, though the mine tailing productive rate is higher; But grade is merely 11.93%, is lower than total mine tailing iron grade (14.17%), and iron recovery reduces not obvious; Both reach the purpose of removing sludge, gangue mineral, guaranteed the rate of recovery of iron again.Through two sections～four sections deslimings, the grade of iron can progressively rise, and iron mineral is less with the mud loss.The desliming productive rate is more than 50%, and desliming is effective.
Table 1: the mineral processing index after each section desliming
Concentrate after the desliming gets into 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 behind the 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 (10)
1. combination desliming technology that can be used for ore dressing may further comprise the steps:
(1) the ore product after the fragmentation is carried out primary grinding earlier, the discharge behind the primary grinding carries out one section classification, and the underflow after one section classification returns and gets into primary grinding once more, and the overflow after one section classification enters into next step;
(2) two sections classifications are carried out in the overflow after above-mentioned one section classification, and the underflow after two sections classifications carries out secondary grinding, and the discharge behind the secondary grinding returns and gets into two sections classifications once more, and the overflow after two sections classifications enters into next step;
(3) low intensity magnetic separation is carried out in the overflow after two sections classifications, the magnetic tailing after the low intensity magnetic separation is through concentrating, handling at a distance from slag, high intensity magnetic separation, and the magnetic concentrate behind low intensity magnetic separation and the high intensity magnetic separation carries out three sections classifications;
Underflow after (4) three sections classifications carries out three sections ore grindings again, and discharge returns and gets into three sections classifications once more behind three sections ore grindings, and the overflow after three sections classifications enters into next step;
(5) two sections deslimings are carried out in the overflow after above-mentioned three sections classifications, the underflow after two sections deslimings carries out weak magnetic to be roughly selected and obtains rough concentrate, and the mine tailing after weak magnetic is roughly selected carries out follow-up three sections deslimings or four sections above deslimings of desliming to be handled;
Each section desliming after the said step (4) is handled and is all adopted selective flocculation desliming technology, and the desliming device that each section desliming is adopted is thickener.
2. the combination desliming technology that can be used for ore dressing according to claim 1 is characterized in that: in the said selective flocculation desliming process, the pH value is controlled at 9～10; The pH adjustment agent of adopting when said pH value is controlled is NaOH, and the consumption of said NaOH is by 1.2kg/t～1.5kg/t; In the said selective flocculation desliming process, the flocculant of employing is the humic acid amide, and the consumption of humic acid amide is 0.75kg/t～0.9kg/t; In the said selective flocculation desliming process, the feed ore concentration when controlling each section desliming is 12%～20%, and underflow density is 30%～50%.
3. the combination desliming technology that can be used for ore dressing according to claim 1; It is characterized in that: said thickener is the modified thickener; It comprises thickener pond body, and the periphery of thickener pond body is provided with downflow weir, and the bottom of thickener pond body is provided with the rake frame with spigot place at the bottom of ore pulp cleaning to the pond that deposits in the pond; On the height and position between said modified thickener overflow liquid level and the said rake frame, be provided with water pipe, offer the delivery port that is directed upwardly on the water pipe; The top of said thickener pond body is provided with crane span structure, and said water pipe is connected in the crane span structure below.
4. the combination desliming technology that can be used for ore dressing according to claim 3 is characterized in that: said thickener pond body is a cylindrical shape, and said water pipe is an annular conduit, evenly is laid with a plurality of delivery ports on the said annular conduit; The quantity of said annular conduit is more than two, and each annular conduit has different diameters, the central axis of the annular conduit of said different-diameter all with the thickener central axes.
5. the combination desliming technology that can be used for ore dressing according to claim 4; It is characterized in that: the quantity of said annular conduit is two; If the internal diameter of said thickener pond body is D, the diameter of major diameter annular conduit is d1, and the diameter of minor diameter annular conduit is d2; D1/D=75%～85% is then arranged, d2/D=50%～60%; If the degree of depth of said thickener pond body is H, the fitting depth of two said annular conduits in the body of thickener pond is h, and h/H=15%～25% is then arranged.
6. according to each described combination desliming technology that can be used for ore dressing in the claim 1～5; It is characterized in that: said ore product is meant the microfine iron ore; Said microfine iron ore is to be master's mixing ore deposit with magnetic iron ore and bloodstone, and the disseminated grain size of said microfine iron ore is 2 μ m～30 μ m; The feed preparation unit size of said primary grinding is below 10mm.
7. according to each described combination desliming technology that can be used for ore dressing in the claim 1～5; It is characterized in that: said primary grinding, secondary grinding, three sections ore grindings all adopt ball mill to carry out ore grinding; Said one section classification, two sections classifications, three sections classifications all adopt cyclone to carry out classification, and said ore grinding and classification all are in the closed circuit grinding system, to carry out.
8. the combination desliming technology that can be used for ore dressing according to claim 7; It is characterized in that: the draw ratio of the ball mill that said three sections ore grindings adopt is 2.5～3.0; The milling medium that adopts in the said primary grinding is a steel ball; The milling medium that adopts in said secondary grinding and the three sections ore grindings is the steel section, and the charging quantity of said steel section is 20%～40% of a said ball mill barrel volume.
9. the combination desliming technology that can be used for ore dressing according to claim 8 is characterized in that: said steel section is a biplane round platform shaped steel section, and the diameter of said steel section is Φ 20mm～Φ 45mm; The proportioning of the steel section of different size is Φ 45 * 50: Φ 30 * 35 in the said secondary grinding: Φ 20 * 25=3.5～4.5: 3.5～4.5: 1～3; The proportioning of the steel section of different size is Φ 30 * 35 in said three sections ore grindings: Φ 20 * 25=7～9: 1～3.
10. the combination desliming technology that can be used for ore dressing according to claim 7 is characterized in that: the ore discharge fineness control-0.074mm of said primary grinding accounts for 75%～80%; The ore discharge fineness control-0.048mm of said secondary grinding accounts for more than 85%; Said three sections ore grindings adopt the cyclone of Φ 150mm to carry out cyclone classification, and the ore discharge fineness control-0.025mm behind three sections ore grindings accounts for more than 85%.
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| CN103386361A (en) * | 2013-08-02 | 2013-11-13 | 长沙矿冶研究院有限责任公司 | Beneficiation method for mixed magnetite and hematite |
| 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 |
| CN103962214A (en) * | 2014-06-03 | 2014-08-06 | 中冶沈勘秦皇岛工程技术有限公司 | Combined beneficiation method and combined beneficiation system for comprehensive recovery of associated 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 |
| CN111036388A (en) * | 2018-10-11 | 2020-04-21 | 中蓝连海设计研究院有限公司 | Washing and grading flotation method for weathered phosphate ore |
| CN113260723A (en) * | 2018-11-14 | 2021-08-13 | 铁桥运营私人有限公司 | Method and apparatus for processing magnetite |
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| CN103386361A (en) * | 2013-08-02 | 2013-11-13 | 长沙矿冶研究院有限责任公司 | Beneficiation method for mixed magnetite and hematite |
| 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 |
| CN103962214A (en) * | 2014-06-03 | 2014-08-06 | 中冶沈勘秦皇岛工程技术有限公司 | Combined beneficiation method and combined beneficiation system for comprehensive recovery of associated iron-phosphate minerals |
| 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 |
| CN111036388A (en) * | 2018-10-11 | 2020-04-21 | 中蓝连海设计研究院有限公司 | Washing and grading flotation method for weathered phosphate ore |
| CN113260723A (en) * | 2018-11-14 | 2021-08-13 | 铁桥运营私人有限公司 | Method and apparatus for processing magnetite |
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