CN109513521A - A kind of ore-dressing technique recycling iron from asbestos tailings - Google Patents
A kind of ore-dressing technique recycling iron from asbestos tailings Download PDFInfo
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- CN109513521A CN109513521A CN201910072216.1A CN201910072216A CN109513521A CN 109513521 A CN109513521 A CN 109513521A CN 201910072216 A CN201910072216 A CN 201910072216A CN 109513521 A CN109513521 A CN 109513521A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 239000010425 asbestos Substances 0.000 title claims abstract description 88
- 229910052895 riebeckite Inorganic materials 0.000 title claims abstract description 88
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004064 recycling Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 48
- 238000000227 grinding Methods 0.000 claims abstract description 41
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 41
- 239000011707 mineral Substances 0.000 claims abstract description 41
- 238000007885 magnetic separation Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000012141 concentrate Substances 0.000 claims abstract description 16
- 239000006148 magnetic separator Substances 0.000 claims abstract description 8
- 238000000498 ball milling Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 4
- 239000011358 absorbing material Substances 0.000 claims abstract description 3
- 238000007873 sieving Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 26
- 238000012216 screening Methods 0.000 claims description 17
- 238000000746 purification Methods 0.000 claims description 8
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 description 20
- 238000011084 recovery Methods 0.000 description 13
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- 239000000203 mixture Substances 0.000 description 7
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 208000005156 Dehydration Diseases 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000002734 clay mineral Substances 0.000 description 5
- 238000005345 coagulation Methods 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 5
- 229920000742 Cotton Polymers 0.000 description 4
- 230000001174 ascending effect Effects 0.000 description 4
- 238000003776 cleavage reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 239000000843 powder Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 229910052620 chrysotile Inorganic materials 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- CWBIFDGMOSWLRQ-UHFFFAOYSA-N trimagnesium;hydroxy(trioxido)silane;hydrate Chemical compound O.[Mg+2].[Mg+2].[Mg+2].O[Si]([O-])([O-])[O-].O[Si]([O-])([O-])[O-] CWBIFDGMOSWLRQ-UHFFFAOYSA-N 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 229920001971 elastomer Polymers 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910001608 iron mineral Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The present invention discloses a kind of ore-dressing technique that iron is recycled from asbestos tailings, comprising steps of asbestos tailings are crushed after tentatively sieving, it is sieved again after broken, material of the granularity lower than 10mm adds water to enter junior's processing after regrading, and the material return greater than 10mm continues to be crushed；Using ball mill and grader, the classifying mineral slurry concentration for controlling material is 7-25%, and the pulp density of ball milling ore grinding is between 75-85%；Using magnetic separator, iron-bearing mineral in absorbing material is simultaneously sent into downstream；The material not being drawn is discharged into tailing pit as tailing；Iron-bearing mineral is classified using cyclone, the material greater than 250-325 mesh partial size enters secondary grinding after eddy flow is concentrated, and the material less than 250-325 mesh partial size enters two stages of magnetic separation；It is finally dehydrated through disk vacuum filter, obtains Iron concentrate product.The ore-dressing technique provided by the invention that iron is recycled from asbestos tailings, beneficiating efficiency is high, cost and low energy consumption.
Description
Technical field
The present invention relates to mineral processing technology fields, more particularly to a kind of dresser for recycling iron from asbestos tailings
Skill.
Background technique
Chrysotile is also referred to as chrysotile, is a kind of mineral in nonmetallic ore.Asbestos deposit is the mineral deposit of serpentine containing cotton,
Its average production-grade is between 3-6%, since grade is low, asbestos ore dressing can generate a large amount of serpentine tailings.Due to opening
It is long to adopt history, mine is numerous, and asbestos tailings storage is accumulated at 1,000,000,000 tons or more by China.Contain the iron oxide of 6-10% in serpentine
Mine, wherein 80% or more is magnetic mineral.Since asbestos tailings are crushed when selecting asbestos by multistage, granularity≤30mm, because
This, although the grade of iron is not high in asbestos tailings, selecting iron still has certain economic interests that can scheme, and removes in serpentine minerals in addition
Containing except magnetic iron ore, also containing there are many Non-ferrous minerals, such as nickel oxide, cobalt oxide.And these mineral are and magnet
Mine symbiosis, it selects and also just selects a variety of Non-ferrous minerals in serpentine together while iron, to realize asbestos tail
The recycling of multi-metallic minerals in mine.Thus, asbestos tailings select iron to have certain comprehensive benefit.
Existing asbestos tailings iron selection technique is essentially all using common magnetic separation process, and basic procedure, which can be sketched, is
Broken, the classification of multistage grinding, multistage, multistage magnetic separation, dehydrating process.These techniques select iron operation adaptability to asbestos tailings
Difference, effect is undesirable, and most direct presentation is exactly that the rate of recovery of iron is low (only 50-60%), the low (52- of Iron concentrate grade
56%), beneficiating efficiency is not high, cost and energy consumption is high.
Summary of the invention
The object of the present invention is to provide a kind of from asbestos tailings recycles the ore-dressing technique of iron, to solve the above-mentioned prior art
There are the problem of, keep the rate of recovery of iron high, Iron concentrate grade is high, and beneficiating efficiency is high, cost and low energy consumption.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of ore-dressing technique that iron is recycled from asbestos tailings, includes the following steps:
Step 1；Pretreatment, asbestos tailings are crushed after tentatively sieving, and are sieved again after broken, secondary sieve
Material of the granularity lower than 10mm adds water to enter junior's processing unit after point, and the material return greater than 10mm continues to be crushed；
Step 2；Primary grinding；Using double spiral shells of 1.2 × 12m of lattice-type ball mill and model Φ of 2.2 × 4.5m of Φ
Grader is revolved, the classifying mineral slurry concentration for controlling material is 7-25%, and the pulp density of ball milling ore grinding is between 75-85%；
Step 3；One stages of magnetic separation；The lower one stream of iron-bearing mineral and feeding using cylinder permanent-magnet magnetic separator, in absorbing material
Journey；The material not being drawn is discharged into tailing pit as tailing；
Step 4；Cyclone classification；Iron-bearing mineral is classified using polyurethane cyclone, is greater than 250-325 mesh partial size
Material enter secondary grinding after eddy flow is concentrated, the material less than 250-325 mesh partial size is directly entered two stages of magnetic separation；
Step 5: repeating Step 2: three and four, until by iron-bearing mineral after three stages of magnetic separation, then through disc type vacuum mistake
Filter dehydration, obtains Iron concentrate product.
It optionally, further include magnetic weight sorting step between magnetic separation and cyclone classification；Magnetic is sorted again using magnetic weight sorting machine, institute
State magnetic weight sorting machine diameter 3.5m, high 3.0m, the magnetic field strength 1300MT of bottom formula disk, mixing speed 7r/min.
Optionally, in step 1, the material after regrading further includes except asbestos step, which uses an alternating flow
State machine；In step 2 and step 5, the material after primary grinding and secondary grinding equally uses alternation fluidised form machine to carry out material
Except asbestos operate；Material after three sections of ore grindings is carried out finally using drum sieve except asbestos operate.
Optionally, it is provided with a drum sieve on the tail water flow path of the alternation fluidised form machine after secondary grinding, for catching
Receive asbestos, return iron content ore pulp.
It optionally, further include asbestos recycling step, the asbestos for that will be removed after alternation fluidised form machine and cylinder screening
Recycling；Including using 4 drum sieves arranged side by side to carry out one section of screening purification of fountain first；Secondly using two drum sieves arranged side by side into
The two sections of screening purifications of row fountain, are carried out Swirling flow sand-removing using one 4 groups of cyclone group later, are finally filtered using filled type
Machine is dehydrated.
Optionally, the magnetic weight sorting machine includes cylinder, the row's of being connected separately with tail water hole on the side wall of the cylinder upper end
And overflow launder, vertical feed sleeve and agitating shaft are provided in the cylinder, the agitating shaft top passes through stirring bearing block
It is set at the top of the cylinder；Multiple stirring scratch boards are symmetrically installed on the agitating shaft, the cylinder body bottom is provided with disk,
Tapered portion is provided with below the disk, the tapered portion and the cylinder body bottom are tightly connected, installation above the tapered portion
There is water supply pipe dish, the tapered portion bottom is equipped with the second closed discharger.
Optionally, the disk is internal equipped with permanent magnet, and outside is coated with the disklike body knot of magnetic and wear-resistant material
Structure, the diameter of the disk are less than the inner diameter of steel flue of cylinder；The permanent magnet radially presses the magnetic of S-N-S-N in the disk
Pole arrangement.
Optionally, it is symmetrically installed on the agitating shaft there are four the stirring scratch board, four stirring scratch board decibels are
Involute structure.
The present invention achieves following technical effect compared with the existing technology:
The present invention, which generates material under the action of the intracorporal solid-liquid two-phase flow of machine is in pulse compressed air, has impact force
Undulation, can make inclusion enclave or aggregate repeatedly air pressure impact, material collision and up and down break in the movement rolled
Solution, while stone, iron content particle and fiber disposably separate in body, asbestos separative efficiency is up to 98%, thus effectively
During solving asbestos tailings iron selection technique, asbestos wool and in piecewise ore grinding continuous cleavage asbestos beam blending contain iron ore
In object, to a series of adverse effects of magnetic separation and grinding operation generation.
It while selecting iron, has recycled asbestos and its quality is made to reach product standard, to realize asbestos in dresser
Separation, purification, utilization in skill, ore dressing Economic model are more preferable.
The middle magnetic of ore pulp swirling motion (preferably with stirring, can be made using the middle magnetic coagulation equipment that the present invention uses
Agglomeration devices), nonferrous clay minerals particle during selecting iron can be efficiently separated, also energy collecting simultaneously is by clay class
Mineral wrap up and are not separated the part magnetism iron-bearing mineral particle come in magnetic separator magnetic separation.
The grade for the Iron concentrate selected can be made to reach 62% using the present invention, the rate of recovery of iron reaches 75%.Asbestos return
Yield reaches 98%, and the quality of asbestos product meets and exceeds the requirement of national standard GB/T8071-708, and overall economic efficiency is significant.
Without toxic, harmful or heavy metal object generation, without secondary pollution in ore dressing process.Water in technical process is circulation
It utilizes, due to using the segmentation dewatering process between each process, the utilization rate of centralized recovery, water is higher.This technique is wet process
Operation does not generate dust pollution, and it is purifying to realize production process.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is one flow diagram of embodiment that the ore-dressing technique of iron is recycled from asbestos tailings；
Fig. 2 is two flow diagram of embodiment that the ore-dressing technique of iron is recycled from asbestos tailings；
Fig. 3 is three flow diagram of embodiment that the ore-dressing technique of iron is recycled from asbestos tailings；
Fig. 4 is the magnetic weight separator structure schematic diagram for the ore-dressing technique that iron is recycled from asbestos tailings；
Fig. 5 is the magnetic weight sorting machine top view for the ore-dressing technique that iron is recycled from asbestos tailings；
In figure, 1 it is row tail water hole, 2 is stirring bearing block, 3 is overflow launder, 4 is agitating shaft, 5 is feed sleeve, 6 to stir
Mix scraper plate, 7 be disk, 8 be the second closed discharger, 9 for water coil.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of from asbestos tailings recycles the ore-dressing technique of iron, to solve the above-mentioned prior art
There are the problem of, keep the rate of recovery of iron high, Iron concentrate grade is high, and beneficiating efficiency is high, cost and low energy consumption.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
In every section of process for selecting iron while using alternation classification, magnetic gravity treatment, magnetic separation process, i.e. alternation fluidization-magnetic
Choosing-magnetic gravity treatment-classification-ore grinding composition three-stage beneficiation flowsheet.It is characterized in that ore dressing process does not have to any medicament, it is right
Water does not need to be adjusted pH value without particular/special requirement yet yet.Its feature is also resided in have separated in asbestos tailings in time and be remained
Asbestos and after piecewise ore grinding continuous cleavage asbestos beam, eliminate asbestos in ore pulp to the adverse effect for selecting iron.And this
One technology is the alternation fluidised form machine using independent development.For solving the clay minerals in ore pulp to selecting the unfavorable of Iron grade
It influences then to use magnetic-gravity separation equipment.For solving the selected equipment of iron powder using cylinder magnetic separator.Be classified for ore pulp,
The equipment of concentration uses spiral-flow type grader.Grinding attachment uses ball mill.Dehydration equipment uses disc type rotary vacuum filter.
The characteristics of this process flow, also resides in, and has carried out dedusting and desanding to each asbestos for selecting iron job step to separate
Wet process sorts, so that asbestos be made to be purified, has reached the standard of asbestos product, has obtained asbestos product, achieves comprehensive benefit
With the purpose of tailing, economic benefit is more excellent than single selection Iron concentrate.Asbestos purification process use two sections of screening dedustings, one section
Swirling flow sand-removing, dewatering process.Screening purification operation uses fountain drum sieve, and desanding operation uses multiple groups cyclone, and dehydration is adopted
With fill-type flame filter press.
Embodiment one
The material used of the present embodiment is the tailing in certain asbestos deposit dressing plant, in tailing the content of asbestos be 3-3.5% (not
Count asbestos beam), the content of magnetic iron ore (TFe) is 8.5%, tailing moisture content 3% or so.
As shown in Figure 1, tailing by ore storage bin by 2 tons/when mine-supplying quantity uniformly feed screening operation, be crushed before screening plant
For hummer screen, 30 × 30mm of sieve diameter, screen area 2.5m × 1.5m, after classification >=ore of 30mm enters vertical shaft type
Crusher, the ore of < 30mm enter grinding operation, 750 4 layers of vertical-spindle hammer crusher of model Φ of vertical-spindle hammer crusher.The type is broken
The advantages of broken machine is that the breakage to asbestos fibre is small, is conducive to the length for protecting asbestos fibre.Vertical shaft particle size after cracking is 10mm, is broken
The mesh of electric and magnetic oscillation sieve classification after broken machine is 10 × 10mm.The material of > 10mm partial size, which returns, to be crushed, < 10mm partial size
Material enters primary grinding operation.
Primary grinding equipment is lattice-type ball mill 2 of 2.2 × 4.5m of Φ, and classifying equipoment is duplex-spiral classifier 2,
1.2 × 12m of model Φ.One section of ball milling Control granularity is 4-20 mesh.Classifying mineral slurry concentration is 7-25%, the ore pulp of ball milling ore grinding
Concentration is between 75-85%.
One stages of magnetic separation equipment is cylinder permanent-magnet magnetic separator, and drums for magnetic separation machine is having a size of 1.2 × 2.4m of Φ, magnetic field strength
350mt.Two block form arrangements, the mineral sucted by magnetic separation roller are that iron-bearing mineral is not sucked up into next beneficiation flowsheet
Mineral be discharged into tailing pit as tailing.
Because the targeted particle size of secondary grinding is 250-325 mesh, point of the ore pulp after a stages of magnetic separation through cyclone classification
Grade Control granularity is also 250-325 mesh, and the object grain greater than this partial size enters mill into two sections after eddy flow is concentrated, less than this partial size
Material is directly entered two stages of magnetic separation operations.Cyclone group is made of the polyurethane cyclone of 6 Φ 250mm.Secondary grinding is set
Standby is Φ 2.2 × 4.5m overflowball mill.The two same stages of magnetic separation of stages of magnetic separation equipment, two side by side.Material in magnetic separation
Through cyclone classification, the material that magnetic separation is fallen throws tail.The targeted particle size of three sections of ore grindings is 380-400 mesh, so before three sections of ore grindings
Cyclone classification control is concentrated into three sections of ball millings to enter to grind in partial size 380-400 mesh, the material greater than this partial size through eddy flow, is less than this grain
It is selected that the material of diameter is directly entered three stage magnetic separators.This section of cyclone group is made of the polyurethane cyclone of 4 Φ 30mm.
Three sections of grinding attachments are Φ 2.2 × 4.5m overflowball mill.Three stages of magnetic separation operations are 2 Φ 800 × 700
Permanent magnetic expansion cylinder magnetic extractor, two side by side, magnetic field strength 350MT.Product after three stages of magnetic separation, then through disk vacuum filter
(two) dehydrations are to get Iron concentrate product.
Iron operation is selected to put into 70 tons of tailing (average grade 8.5%) altogether through the process, the Iron concentrate of output is 1.3 tons
(butt), through chemically examining, Iron concentrate grade 54%, tailing average grade 5%, head grade 8.5%, recovery rate in ore-dressing is
45.3%.
Embodiment two
The material used of the present embodiment is the same as embodiment one.As shown in Fig. 2, the present embodiment and embodiment one the difference is that
In order to improve the grade and recovery rate in ore-dressing of final Iron concentrate, it is necessary to by clay minerals in three sections of sorting operations and the time-division
It separates out, the ore dressing grade of every stages of magnetic separation on the one hand can be improved in this way, on the other hand reduce clay minerals and disappear in ore grinding
The idle work of consumption, in addition, respectively increasing one section of secondary collecting ferrous material of magnetic weight in row's caudal of a stages of magnetic separation and two stages of magnetic separation
Operation, the purpose is to the losses of iron-bearing mineral in the row's of being reduced as far as tail, to improve recovery rate in ore-dressing.
The magnetic gravitational separation equipment of the present embodiment configuration is CJ350 type, i.e. magnetic weight sorting machine of the cylinder body bottom with stirring, cylinder
Diameter 3.5m, high 3.0m, bottom formula disk, magnetic field strength 1300MT, mixing speed 7r/min.The concentration control for being fed ore pulp exists
5-9%.One section and two sections of magnetic weights are respectively 3 equipment, wherein one is used to fine powder and purifies, 2 are used to tail slurry collecting, three sections of configurations
One magnetic heavy-duty machine.Other preparation equipments are same as Example 1 in process.
What is be the same as example 1 gives mine rate (2 tons/when give mine speed), is an analysis by the treating capacity of 70T ore
Unit, embodiment 2 obtain following test result: 70 tons of tailings glass amount (being converted into butt), the total 4.8T of output Iron concentrate.Through changing
It tests, fine powder grade 56.7%, tailings grade 3.8%.Selected asbestos tailings grade 8.5%, recovery rate in ore-dressing 59.2%.
From experimental result as can be seen that embodiment two is because added middle magnetic coagulation equipment, compared with the pure magnetic separation work of embodiment one
Skill, which has, to be obviously improved, and concentrate grade and the rate of recovery are all improved, but grinding efficiency is not high, and overall target is also undesirable.
Embodiment three
Material used in the present embodiment is the same as embodiment one, two.The present embodiment is different from embodiment one, two, is implementing
Two kinds of equipment except asbestos are added on the process base of example two, as shown in figure 3, one is alternation fluidised form machine, another kind is round
Shaft screen, one, alternation fluidised form machine are arranged in the process after crushing and screening, remove asbestos wool for dry tailing, another two are arranged in
One, the rear end of secondary grinding before magnetic separation, for removing cotton by a large amount of asbestos beams of cleavage after ore grinding, improves magnetic separation with this and makees
The material environment of industry.
Installed additional after three sections of ore grindings except cotton equipment is drum sieve, this mainly considers after three sections of ore grindings, by cleavage
Asbestos beam it is few, and fiber is extremely short, has been able to satisfy technique requirement with very thin sieve (300 mesh), while equipment manufacturing cost is small, energy
It consumes low.
Magnetic-gravity separation equipment of the invention be magnetic weight sorting machine, as shown in Figure 4 and Figure 5, magnetic weight separator structure include into
Expect casing 5, ore pulp enters the bottom of cylinder by feed sleeve 5, and under gravity, and solid mineral grain is under casing
The 7 surrounding cross flow of disk in portion.Disk 7 is internal equipped with permanent magnet, the disklike body that outside is with saturating magnetic and wear-resisting material is coated,
Its diameter is less than the inner diameter of steel flue of cylinder.Magnet Boulez in disk 7 is the magnetic pole sequence in radial direction by S-N-S-N, so
The upper surface of disk 7 also forms the polarity of the magnetic field for prolonging radial S-N-S-N.The top of disk 7 is stirring scratch board 6, it is by four
The scraper plate of a involute is constituted, and the position that the lower part of stirring scratch board 6 is contacted with disk 7 is rubber slab, and scraper plate is avoided to rotate
When contacted firmly with disk 7.Stirring scratch board 6 is connect with agitating shaft 4, and agitating shaft 4 is fixed on the stirring bearing block 2 on cylinder top,
And it is driven by driving equipment.By adjusting the slewing rate of agitating shaft 4, ore pulp in cylinder is just also had adjusted by stirring scratch board 6
The revolving speed of stream, and then affect the tangential velocity and buoyancy of ore pulp chats composition granule.Overflow launder 3 and row's tail water are arranged at the top of cylinder
Hole 1, the tail water (containing tailing) come is overflowed from cylinder top to be discharged by row tail water hole 1.Cylinder cone in 7 lower part of disk
Part, is laid with to water coil 9, by adjusting the size to 9 water supply of water coil come the size of ascending current in adjustment barrel body, into
And also just have adjusted the size of the buoyancy of water.The bottom of cylinder cone portion is equipped with the second closed discharger 8, for arranging from magnetic
The mineral grain (iron-bearing mineral particle) for the weight that 7 edge of disk is fallen, but also water cannot be allowed freely to leak.
When work, ore pulp enters the cylinder for filling the magnetic heavy-duty machine of water, under the action of self-weight, mineral from feed sleeve 5
Grain is flowed on disk 7 by the bottom of feed sleeve 5, and due to the magnetic attraction of disk 7, mineral grain containing magnet is attracted on disk
On 7, and the mineral grain without magnet is then gradually to the periphery diffusion of disk 7.The material accumulated at disk 7 and feed sleeve 5
Under the drive of rotating stirring scratch board 6, in time to the periphery movement of disk 7.Stirring scratch board 6 is by being fixed on stirring
What the agitating shaft 4 on bearing block 2 drove, the top of agitating shaft 4 is equipped with driving device.Material on disk 7 is in 7 magnetic of disk
Following movement can occur under the collective effect of power, the rotation of stirring scratch board 6 and rotary water current (caused by scraper rotary turns)；First is that setting
The rotation for counting into the stirring scratch board 6 of involute can force mineral grain rapidly to the periphery movement (work of centrifugal force of disk 7
With).Two, which are designed to the polar disk 7 of S-N-S-N, can make the mineral grain in movement in magnetic attraction change in polarity, stirring scratch board
It under the collective effect of 6 pressure driving, constantly overturns, opens aggregate and inclusion enclave, and with the track of involute to magnetic
7 periphery movement of disk.Third is that the ascending current driven by stirring scratch board 6 can be the light mine constantly separated on disk 7 due to overturning
Composition granule (being free of magnet) eddy flow is moved upwards, is sorted again to implement magnetic-.Meanwhile the mine constantly moved to cylinder periphery
Composition granule, by the control to cylinder lower part to the confluent of water coil 9, contains heavy suite (when reaching 7 edge of disk
Magnet mineral) it falls, it is discharged into conical section, and by the second closed discharger 8 of cylinder lowest part.And reach 7 side of disk
The light mineral particle (be free of or seldom the mineral containing magnet) of edge, around the disk 7 and cylinder constantly under the drive of ascending current
Upwards, and with water flow it spins ascending motion, to implement secondary gravity treatment to material.Light mineral particle is with spiralling water
Stream overflows in overflow launder 3 from cylinder topmost, and is discharged by row's tail water hole 1.
It is installed additional in addition to the equipment of asbestos except above-mentioned in the main flow for selecting iron, in addition the also tail of the alternation fluidised form operation at two sections
Water flow road has installed one additional for collecting asbestos, the drum sieve of return iron content ore pulp, it is therefore an objective to improve the rate of recovery of iron mineral.
The a set of asbestos reclaiming clean process of the process design of the present embodiment, is screened and purified, one section of Swirling flow sand-removing group by two sections of fountains
At.One section of screening purification is 4 drum sieves arranged side by side, and two sections of screenings are arranged side by side for 2, the cyclone group that Swirling flow sand-removing is one 4 groups
(Φ 250), dehydration equipment are fill-type filter.Alternating flow machine used in the present embodiment is the equipment of independent research, such as this Shen
Please structure (please referring to Fig. 2) described in material, which handles 25 tons of ore amount, bed surface having a size of length × wide=4.5m ×
1.5m.In the present embodiment, dry mine object is except the solid-to-liquid ratio control of asbestos is between 7-25.Ore pulp removes the pulp density of asbestos operation
Control is between 2-7.Because equipment treating capacity is big, each section of this process only matches one.The circle of rotary spraying type used in the present embodiment
Shaft screen is home-built equipment, and size of screen surface is Φ 1.2m, long 4m, revolving speed 60r/min, 4 tons of throughput per hour (butt) of single sieve.
The pulp density of each stages of magnetic separation of the present embodiment is 10-7%.
Mine rate (2 tons/when) are given as embodiment one, two, taking 70T throughput is an analytical unit, real
It applies example three and obtains following test result:
70 tons of tailings glass amount (being converted into butt), totally 8.5 tons of output Iron concentrate, through chemically examining, Iron concentrate grade 62.8%, tail
Mine grade 2.3%, is selected in the grade 8.5% of asbestos tailings, and the recovery rate in ore-dressing of iron is 76%.In addition, recycling asbestos fibre
12.6 tons (being converted into butt), dust content≤5% of asbestos, gravel content≤1.0% is better than product national standard.Asbestos
Yield be more than by the calculation amount of tailing cotton content 3-3.5%, this illustrate in tailing containing no less than 2% largely do not solve
The asbestos beam of reason.
Just because of the timely removal of asbestos, select flowing molten iron journey smooth and efficient, grinding efficiency significantly improves, and abrasion reduce,
Enter the increase of mine amount.Through counting, iron production line energy consumption has dropped 2% compared with embodiment one, two, the treating capacity and life of entire production system
Efficiency is produced to rise significantly.
Ore-dressing technique as described above, in after the product of alternation fluidised form machine gravity treatment upper back overflow is have passed through except iron sand
Asbestos and dust mix products, also need by cleaning dust and desanding operation, and this technical process is in the art
There is consideration.The product of overflow is the water slurry mixture containing asbestos and dust after flowing the machine gravity treatment of alternation state, and pulp density is in 5-
Between 7%.Since asbestos dust is by fine particles such as the fine powder of serpentine, ground mulching loess, talcum, montmorillonites
Mixing is constituted, and after these mineral are mixed into ore pulp with water, has very big viscosity.Fiber and dust are shown in screening operation
Be not readily separated, " paste sieve ", " sticky net " the phenomenon that；So preferred rotary spraying type drum sieve.
Pulp density into screening operation should control between 5-7%, and sorted materials are sufficiently mixed with water, ore pulp
Uniformly.The equipment that asbestos and dust carry out screening purification and graded operation is used rotary spraying type drum sieve.For sloughing
The magnetic gravity concentrator of clay minerals (also have and be used to collecting weak magnetic mineral after magnetic separation, improve the effect of the rate of recovery of iron), uses
Be the middle magnetic coagulation equipment with stirring action, such as middle magnetic coagulation column magnetic separator, middle magnetic coagulation device etc..Into the ore pulp of magnetic heavy-duty machine
Concentration is 10-30%.Equipment for ore grinding is ball mill, overflow type or grid-like to be ok.Two sections and three sections of point
Grade equipment is common cyclone group, and the cyclone diameter before secondary grinding is Φ 70-350mm, the cyclone before three sections of ore grindings
Diameter is Φ 20-250mm.And the classifying equipoment after one section of ball milling uses spiral classifier.
Specific examples are applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (8)
1. a kind of ore-dressing technique for recycling iron from asbestos tailings, characterized by the following steps:
Step 1；Pretreatment, asbestos tailings are crushed after tentatively sieving, and are sieved again after broken, after regrading
Material of the granularity lower than 10mm adds water to enter junior's processing unit, and the material return greater than 10mm continues to be crushed；
Step 2；Primary grinding；Using the double helix point of 1.2 × 12m of lattice-type ball mill and model Φ of 2.2 × 4.5m of Φ
Grade machine, the classifying mineral slurry concentration for controlling material is 7-25%, and the pulp density of ball milling ore grinding is between 75-85%；
Step 3；One stages of magnetic separation；Using cylinder permanent-magnet magnetic separator, iron-bearing mineral in absorbing material is simultaneously sent into downstream；Not
The material being drawn is discharged into tailing pit as tailing；
Step 4；Cyclone classification；Iron-bearing mineral is classified using polyurethane cyclone, greater than the object of 250-325 mesh partial size
Material enters secondary grinding after eddy flow is concentrated, and the material less than 250-325 mesh partial size is directly entered two stages of magnetic separation；
Step 5: repeating Step 2: three and four, until by iron-bearing mineral after three stages of magnetic separation, then through disk vacuum filter
Dehydration, obtains Iron concentrate product.
2. the ore-dressing technique according to claim 1 for recycling iron from asbestos tailings, it is characterised in that: magnetic separation and eddy flow point
It further include magnetic weight sorting step between grade；Magnetic is sorted again using magnetic weight sorting machine, the magnetic weight sorting machine diameter 3.5m, high
3.0m, the magnetic field strength 1300MT of bottom formula disk, mixing speed 7r/min.
3. the ore-dressing technique according to claim 2 for recycling iron from asbestos tailings, it is characterised in that: in step 1, two
Material after secondary screening further includes except asbestos step, which uses an alternation fluidised form machine；In step 2 and step 5, one section
Material after ore grinding and secondary grinding equally uses alternation fluidised form machine operate except asbestos to material；Material after three sections of ore grindings
It is carried out finally using drum sieve except asbestos operate.
4. the ore-dressing technique according to claim 3 for recycling iron from asbestos tailings, it is characterised in that: be located at secondary grinding
It is provided with a drum sieve on the tail water flow path of alternation fluidised form machine afterwards, is used for collecting asbestos, return iron content ore pulp.
5. the ore-dressing technique according to claim 4 for recycling iron from asbestos tailings, it is characterised in that: further include that asbestos return
Step is received, the recycling of the asbestos for that will remove after alternation fluidised form machine and cylinder screening；Including using 4 cylinders arranged side by side first
Sieve carries out one section of screening purification of fountain；Secondly two sections of screening purifications of fountain are carried out using two drum sieves arranged side by side, adopted later
Swirling flow sand-removing is carried out with one 4 groups of cyclone group, is finally dehydrated using filled type filter.
6. the ore-dressing technique according to claim 2 for recycling iron from asbestos tailings again, it is characterised in that: the magnetic sorts
Machine includes cylinder, the row's of being connected separately with tail water hole and overflow launder on the side wall of the cylinder upper end, is provided in the cylinder perpendicular
Straight feed sleeve and agitating shaft, the agitating shaft top are set at the top of the cylinder by stirring bearing block；The stirring
Multiple stirring scratch boards are symmetrically installed on axis, the cylinder body bottom is provided with disk, is provided with tapered portion below the disk, institute
It states tapered portion and the cylinder body bottom is tightly connected, water supply pipe dish, the tapered portion bottom peace are installed above the tapered portion
Equipped with the second closed discharger.
7. the ore-dressing technique according to claim 6 for recycling iron from asbestos tailings, it is characterised in that: the disk is interior
Portion is equipped with permanent magnet, and outside is coated with the disklike body structure of magnetic and wear-resistant material, and the diameter of the disk is less than cylinder
Inner diameter of steel flue；The permanent magnet radially presses the pole arrangement of S-N-S-N in the disk.
8. the ore-dressing technique according to claim 6 for recycling iron from asbestos tailings, it is characterised in that: on the agitating shaft
It is symmetrically installed there are four the stirring scratch board, four stirring scratch board decibels are involute structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110947493A (en) * | 2019-11-20 | 2020-04-03 | 郑州中科新兴产业技术研究院 | A kind of preparation method of ultra-pure iron powder |
| CN111952555A (en) * | 2020-07-07 | 2020-11-17 | 华南理工大学 | A kind of negative electrode material and preparation of lithium ion battery based on iron fine powder |
| CN112453014A (en) * | 2020-10-15 | 2021-03-09 | 平和县鑫泰德远矿业有限公司 | Comprehensive utilization beneficiation method for pyrophyllite tailings |
| CN113578518A (en) * | 2021-05-21 | 2021-11-02 | 若羌县圣地石棉尾料再利用科技开发有限公司 | Method for removing heavy metal by serpentine magnetization |
| CN113856894A (en) * | 2021-08-27 | 2021-12-31 | 吉林鸿源绿洲环保科技有限公司 | Purification process of stone powder |
| CN114178049A (en) * | 2021-12-16 | 2022-03-15 | 昆明理工大学 | Device for supergravity liquid-solid phase fine multistage separation of tailings |
| CN115625033A (en) * | 2022-11-03 | 2023-01-20 | 舒新前 | Method for grading, grading and quality-grading asbestos tailings and recycling asbestos tailings |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110947493A (en) * | 2019-11-20 | 2020-04-03 | 郑州中科新兴产业技术研究院 | A kind of preparation method of ultra-pure iron powder |
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