CN109894366A - The fine pre-selection technique of the red water chestnut compound iron ore of magnetic - Google Patents
The fine pre-selection technique of the red water chestnut compound iron ore of magnetic Download PDFInfo
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- CN109894366A CN109894366A CN201711310290.XA CN201711310290A CN109894366A CN 109894366 A CN109894366 A CN 109894366A CN 201711310290 A CN201711310290 A CN 201711310290A CN 109894366 A CN109894366 A CN 109894366A
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Abstract
The present invention relates to a kind of fine pre-selection techniques of the red water chestnut compound iron ore of magnetic, the pre-selection technique is the following steps are included: 1) broken product is -50mm by, it is sieved through straight line shaker, three acquisition -50+20mm, -20+2mm, -2mm grades, wherein -2mm grade is sieved through high frequency fine screen again, acquisition -2+0.5mm grade, -0.5mm grade, i.e., in broken product be classified to 4 grades: -50+20mm, -20+2mm, -2+0.5mm, -0.5mm;The program particularly suitable for magnetic-of the processing TFe grade between 35.0%-42.0% it is red-water chestnut compound iron ore, the program has the advantages that sharpness of separation is high, and production is stablized, and the rate of recovery is high, and can be applied to the pre-selection of hematite and the red compound iron ore of magnetic-.
Description
Technical field
The present invention relates to a kind of fine pre-selection techniques of the red water chestnut compound iron ore of magnetic, belong to iron ore dressing technical field.
Background technique
It is well known that ore grinding energy consumption accounts for 2/3rds of iron ore beneficiating factory total energy consumption, therefore, " much broken and lessmill " " can be lost morning
Lose " basic principle that should consider first when being determining iron ore dressing technique.Currently, for single magnetic iron ore, with high pressure
The popularization and application of roller grinding process and the progress of wet type magnetic cobbing equipment, the pre-selection technique of magnetic iron ore reaches its maturity, each
Reduction stage pre-selection technique is all applied.First broken product (- 300mm) and in broken product (- 75mm) bulk dry type magnetic can be used
Machine is selected to carry out bulk dry separation;Product (- 12mm) fine crushing and high pressure roller mill ultrafine grinding product (- 3mm) are using magnetic separation in wet type coarse grain
Machine carries out tailings discarding by preconcentration, greatly reduces into ore grinding amount, greatly reduces production cost, and preselecting abandoned tailing can
It is sold as building materials, decreases the tailing amount into Tailings Dam, not only " energy conservation " but also " emission reduction ", economic benefit and environmental benefit are aobvious
It writes.
But for hematite and the pre-selection of the compound iron ore containing hematite, though correlative study unit and bargh
Many beneficial researchs have also so been carried out, but application effect is not satisfactory, the appearance of some pre-selection devices has only carried out work
Industry test, practice of not putting into production really.Compound iron ore for bulk (- 50+20mm) containing hematite, often uses
The group technology of weak magnetic dry separation and bulk jigging, but due to the defect of bulk jigging machine itself, as water consumption is big, production target
It is unstable, equipment failure rate is high etc., iron ore beneficiating factory has rarely had application at present.For middle grade (- 20+5mm or -20+
2mm), the strong magnetic dry separation group technology of magnetic dry separation+roll-type in, although its have the shortcomings that treating capacity it is small, must preparation of sized raw coal,
Production target is stablized, easily operated, is convenient for in-situ production management, bloodstone (Gu Shankuang) selects factory and compound iron ore in part
(meishan iron mine) dressing plant is applied, and is worked well.For fine fraction (- 5mm or -2mm), mine research institute, Ma'an Mountain was once
It develops CS-1 type electromagnetic induction roller intensity magnetic separator to be preselected, also once arrived gushan iron mine and carried out commerical test, initial stage sorts
Index is ideal, but since the defect of equipment itself, such as its magnetic pole head, induction roller are prone to wear, causes dentation deformation, tooth tip
Displacement, magnetic pole head gap increase, magnetic field force weakens and influences sorting result, it is caused to fail really to be successfully applied to production in fact
It tramples.At present for the pre-selection of fine fraction (- 5mm or -2mm), wet drum low intensity magnetic separation+middle magnetic separation group technology is often used, in
Magnetic tailing is directly abandoned as tailing.
In short, the pre-selection of hematite and compound iron ore mainly has following defect at present: (1) bulk pre-selection is using big
Block jigging machine has that water consumption is big, production target is unstable, equipment failure rate is high, the big problem of production management maintenance difficulties, is eliminated
Only matter of time;(2) (- 5mm or -2mm) loses tail using magnetomechanical in wet drum, and middle magnetic field magnetic separator magnetic field strength is low, magnetic
Field gradient is low, and one section of high intensity magnetic separation tailings grade when tailings grade being caused to be elected to be industry much higher than mill illustrates the iron ore that should not be abandoned
Object is lost in middle magnetic tailing, causes metal loss.
Summary of the invention
The present invention exactly for the technical problems in the prior art, provides a kind of the fine of the red water chestnut compound iron ore of magnetic
Pre-selection technique, the program particularly suitable for magnetic-of the processing TFe grade between 35.0%-42.0% it is red-water chestnut compound iron ore,
And the pre-selection of hematite and the red compound iron ore of magnetic-can be applied to.
To achieve the goals above, technical scheme is as follows, a kind of fine pre-selection of the red water chestnut compound iron ore of magnetic
Technique, which is characterized in that the pre-selection technique the following steps are included: 1) will in broken product be -50mm, sieve, obtain through straight line shaker
- 50+20mm, three -20+2mm, -2mm grades are obtained, wherein -2mm grade is sieved through high frequency fine screen again, acquisition -2+0.5mm
Grade, -0.5mm grade, i.e., in broken product be classified to 4 grades: -50+20mm, -20+2mm, -2+0.5mm, -0.5mm;
2) the concentrated machine of -0.5mm grade obtained step 1) is concentrated, then is delivered to Wet-type permanent magnet drum type magnetic with Pulp pump
Machine is selected to carry out low intensity magnetic separation;Low intensity magnetic separation tailing flows into certainly enters the strong magnetic of Verticle ring pulsating high gradient high intensity magnetic separator progress every slag sieve after slag
Choosing;The gravity flow of high intensity magnetic separation tailing enters the big well of Tailing thickening, and weak magnetic concentrate selection merges with high intensity magnetic separation concentrate flows into iron ore concentrate concentration certainly
Big well.
3) -2+0.5mm the grade for obtaining step 1) is delivered to magnetic in the progress of Wet-type permanent magnet drum type magnetic separator through Pulp pump
Choosing;Middle magnetic tailing founds ring pulsating high gradient coarse granule magnetic separator progress high intensity magnetic separation from SLon is flowed into;After high intensity magnetic separation tailings dewatering
Do building materials sale;Middle magnetic concentrate merge with high intensity magnetic separation concentrate dehydration after through Belt Conveying to product storage bin fine crushing.
4) it is dry to be delivered to magnetic in the progress of dry type permanent-magnet drum type magnetic separator through belt for the -20+2mm grade for obtaining step 1)
Choosing;Middle magnetic dry separation tailing carries out strong magnetic dry separation into roll-type strong magnetic dry separator by ore discharge funnel;Strong magnetic dry separation tailing does building materials sale,
Middle magnetic, strong magnetic dry separation concentrate, which merge, is delivered to product storage bin fine crushing through belt.
5) -50+20mm the grade for obtaining step 1), first through one section of closed circuit crushing to -20mm, by Belt Conveying to new
Type inner tube type strong permanent-magnet separator carries out one roughing and sorts, and concentrate is after being dehydrated through Belt Conveying to product storage bin fine crushing.Tail
Mine is sieved through straight line shaker+high frequency fine screen, into the big well of Tailing thickening under sieve, does building materials sale on sieve.
As an improvement of the present invention, the straight line shaker that the step 1) uses is the double-deck A seating linear vibrating screen, straight line
Sieve upper sieve plate is punched screens, and screen size 20mm, lower window screen size is 2mm, and high frequency fine screen screen size is 0.5mm,
It is sieved by different sieve pores, realizes that ore is classified according to granule size, separately sorted convenient for subsequent size fractionated.
As an improvement of the present invention, low intensity magnetic separation uses Wet-type permanent magnet drum type magnetic separator in the step 2), and magnetic field is strong
Degree is 0.2T;High intensity magnetic separation stands ring pulsating high gradient intensity magnetic separator, magnetic field strength 0.2T, two sections of low magnetic field intensity choosings using Slon
Not guarantee -0.5mm concentrate grade, prevents -0.5mm concentrate grade is relatively low from dragging down iron concentrate grade.
As an improvement of the present invention, using magnetomechanical in Wet-type permanent magnet drum type, magnetic field is strong for middle magnetic separation in the step 3)
Degree is 0.4T;High intensity magnetic separation founds ring pulsating high gradient coarse granule intensity magnetic separator, magnetic field strength 0.5T, middle magnetic and strong magnetic using SLon
Two sections sort guarantee iron mineral and sufficiently recycle.
As an improvement of the present invention, middle magnetic dry separation uses magnetic field dry-dressing machine in permanent-magnet chamber type, magnetic in the step 4)
Field intensity is 0.4T;Strong magnetic dry separation uses permanent magnetic roll type strong magnetic dry separator, and magnetic field strength 1.0T first passes through middle magnetic and selects
A part of concentrate reduces strong magnetic mine-supplying quantity and concentrate amount, and convenient for improving high-intensity magnetic separation precision, the strong magnetic of middle magnetic-, which is combined, sorts raising
The ferrous metal rate of recovery.
As an improvement of the present invention, high-intensity magnetic separation uses novel inner tube type strong permanent-magnet separator in the step 5),
Beneficiation flowsheet is one roughing, magnetic field strength 0.4T;The straight line shaker screen size that the step 5) uses is 2mm, high frequency
Dusting cover screen size is 0.5mm.It is classified by crushing and screening, ore is divided into 20-2mm, 2-0.5mm, -0.5mm and is sorted respectively.
Compared with the existing technology, the invention has the advantages that, 1) program first by magnetic-it is red-water chestnut compound iron ore sieve
It is divided into four grades of -50+20mm, -20+2mm, -2+0.5mm, -0.5mm, wherein the TFe grade difference of each grade is big, explanation
Screening operation not only realizes the grading of ore, while according to the crushibility matter difference of iron mineral and gangue mineral, passing through
Screening realizes the preliminary sorting of iron mineral and gangue mineral;2) it is thick to found ring pulsating high gradient using SLon for -2+0.5mm grade
Particle intensity magnetic separator replaces magnetomechanical in conventional wet permanent-magnet chamber type to carry out tailings discarding by preconcentration, can substantially reduce tailings grade.Its reason
It is that vertical ring pulsating high gradient coarse granule intensity magnetic separator magnetic field strength high (can reach 1.0T), magnetic field gradient are high, and Wet-type permanent magnet drum
Magnetomechanical magnetic field strength is only 0.4T in formula, and magnetic field gradient is low;3) -50+20mm grade no longer uses weak magnetic dry separation and bulk to jump
Throwing tail is eliminated, but throwing tail is sorted using novel inner tube type strong permanent-magnet separator after being crushed to -20mm, with technique letter
The advantages that single, sharpness of separation is high, production stabilization, the rate of recovery is high.
Detailed description of the invention
Fig. 1 is the fine pre-selection technological principle process flow chart of the red water chestnut compound iron ore of magnetic of the present invention.
Fig. 2 is the fine pre-selection technique number quality process figure of the red water chestnut compound iron ore of magnetic of the present invention.
Specific embodiment:
In order to deepen the understanding of the present invention, the present embodiment is described in detail with reference to the accompanying drawing.
Embodiment 1: referring to Fig. 1-Fig. 2, a kind of fine pre-selection technique of the red water chestnut compound iron ore of magnetic, the pre-selection technique packet
Include following steps: 1) the broken product i.e. -50mm by is sieved, three acquisition -50+20mm, -20+2mm, -2mm grains through straight line shaker
Grade, wherein -2mm grade is sieved through high frequency fine screen again, acquisition -2+0.5mm grade, -0.5mm grade, i.e., in broken product be graded
For 4 grades: -50+20mm, -20+2mm, -2+0.5mm, -0.5mm;
2) the concentrated machine of -0.5mm grade obtained step 1) is concentrated, then is delivered to Wet-type permanent magnet drum type magnetic with Pulp pump
Machine is selected to carry out low intensity magnetic separation;Low intensity magnetic separation tailing flows into certainly enters the strong magnetic of Verticle ring pulsating high gradient high intensity magnetic separator progress every slag sieve after slag
Choosing;The gravity flow of high intensity magnetic separation tailing enters the big well of Tailing thickening, and weak magnetic concentrate selection merges with high intensity magnetic separation concentrate flows into iron ore concentrate concentration certainly
Big well.
3) -2+0.5mm the grade for obtaining step 1) is delivered to magnetic in the progress of Wet-type permanent magnet drum type magnetic separator through Pulp pump
Choosing;Middle magnetic tailing founds ring pulsating high gradient coarse granule magnetic separator progress high intensity magnetic separation from SLon is flowed into;After high intensity magnetic separation tailings dewatering
Do building materials sale;Middle magnetic concentrate merge with high intensity magnetic separation concentrate dehydration after through Belt Conveying to product storage bin fine crushing.
4) it is dry to be delivered to magnetic in the progress of dry type permanent-magnet drum type magnetic separator through belt for the -20+2mm grade for obtaining step 1)
Choosing;Middle magnetic dry separation tailing carries out strong magnetic dry separation into roll-type strong magnetic dry separator by ore discharge funnel;Strong magnetic dry separation tailing does building materials sale,
Middle magnetic, strong magnetic dry separation concentrate, which merge, is delivered to product storage bin fine crushing through belt.
5) -50+20mm the grade for obtaining step 1), first through one section of closed circuit crushing to -20mm, by Belt Conveying to new
Type inner tube type strong permanent-magnet separator carries out one roughing and sorts, and concentrate is after being dehydrated through Belt Conveying to product storage bin fine crushing.Tail
Mine is sieved through straight line shaker+high frequency fine screen, into the big well of Tailing thickening under sieve, does building materials sale on sieve.
For the straight line shaker that the step 1) uses for the double-deck A seating linear vibrating screen, straight line shaker upper sieve plate is punched screens,
Screen size is 20mm, and lower window screen size is 2mm, and high frequency fine screen screen size is 0.5mm.
Low intensity magnetic separation uses Wet-type permanent magnet drum type magnetic separator, magnetic field strength 0.2T in the step 2);High intensity magnetic separation uses
Slon founds ring pulsating high gradient intensity magnetic separator, magnetic field strength 0.2T.
Middle magnetic separation is using magnetomechanical in Wet-type permanent magnet drum type, magnetic field strength 0.4T in the step 3);High intensity magnetic separation uses
SLon founds ring pulsating high gradient coarse granule intensity magnetic separator, magnetic field strength 0.5T.
Middle magnetic dry separation is using magnetic field dry-dressing machine in permanent-magnet chamber type, magnetic field strength 0.4T in the step 4);Strong magnetic dry separation
Using permanent magnetic roll type strong magnetic dry separator, magnetic field strength 1.0T.
High-intensity magnetic separation uses novel inner tube type strong permanent-magnet separator in the step 5), and Beneficiation flowsheet is one roughing,
Magnetic field strength is 0.4T;For the straight line shaker screen size that the step 5) uses for 2mm, high frequency fine screen screen size is 0.5mm.
Application Example, referring to Fig. 1-Fig. 2, a kind of fine pre-selection technique of the red water chestnut compound iron ore of magnetic, magnetic-is red-and water chestnut is mixed
It closes iron ore and is derived from Jiangsu iron ore, raw ore chemistry multielement analysis the results are shown in Table 1, and Fe clusters analysis the results are shown in Table 2.
1 magnetic of table-red-water chestnut compound iron ore chemistry multielement analysis result
Element | TFe | S | P | CaO | MgO | Al2O3 | SiO2 |
Content % | 39.38 | 1.26 | 0.325 | 6.41 | 1.74 | 3.09 | 17.10 |
2 magnetic of table-red-water chestnut compound iron ore Fe clusters analyze result
Mineral name | Iron phase iron-content (%) | Occupation rate (%) |
Magnetic iron ore | 20.13 | 51.12 |
Red (brown) iron ore | 9.41 | 23.90 |
Ferric carbonate | 7.76 | 19.70 |
Ferrosilite | 0.82 | 2.08 |
Iron sulfide | 1.26 | 3.20 |
Quan Tie | 39.38 | 100.00 |
It can be seen that by table 1, table 2, the magnetic-is red-and water chestnut compound iron ore impurity is more, and silicon, aluminium, sulphur, phosphorus are main impurity element,
Useful iron mineral mainly recyclable is magnetic iron ore, red (brown) iron ore and ferric carbonate in ore.The purpose mine of such ore recuperation
Object is more, and impurity element is more, increases and sorts difficulty.
A kind of magnetic-of the present invention as shown in Figure 1 is red-the principle process flow chart of the fine pre-selection technique of water chestnut compound iron ore
And a kind of magnetic-of the present invention shown in Fig. 2 it is red-the implementation number of cases quality process figure of the fine pre-selection technique of water chestnut compound iron ore sees
Out, a kind of fine pre-selection technique of the red water chestnut compound iron ore of magnetic of the present invention uses following steps:
1) broken product (- 50mm) is sieved through straight line shaker by, three acquisition -50+20mm, -20+2mm, -2mm grades,
In -2mm grade sieved again through high frequency fine screen, acquisition -2+0.5mm, -0.5mm grade, i.e., in broken product be classified to 4 grains
Grade: -50+20mm, -20+2mm, -2+0.5mm, -0.5mm.
2) the concentrated machine of -0.5mm grade obtained step 1) is concentrated, then is delivered to Wet-type permanent magnet drum type magnetic with Pulp pump
Machine is selected to carry out low intensity magnetic separation;Low intensity magnetic separation tailing flows into certainly enters the strong magnetic of Verticle ring pulsating high gradient high intensity magnetic separator progress every slag sieve after slag
Choosing.The gravity flow of high intensity magnetic separation tailing enters the big well of Tailing thickening, and weak magnetic concentrate selection merges big from concentrate concentration is flowed into high intensity magnetic separation concentrate
Well.
3) -2+0.5mm the grade for obtaining step 1) is delivered to magnetic in the progress of Wet-type permanent magnet drum type magnetic separator through Pulp pump
Choosing;Middle magnetic tailing founds ring pulsating high gradient coarse granule intensity magnetic separator progress high intensity magnetic separation from SLon is flowed into.High intensity magnetic separation tailings dewatering
After do building materials sale;Middle magnetic concentrate merge with high intensity magnetic separation concentrate dehydration after through Belt Conveying to product storage bin fine crushing.
4) it is dry to be delivered to magnetic in the progress of dry type permanent-magnet drum type magnetic separator through belt for the -20+2mm grade for obtaining step 1)
Choosing;Middle magnetic dry separation tailing carries out strong magnetic dry separation into roll-type strong magnetic dry separator by ore discharge funnel.Strong magnetic dry separation tailing does building materials sale,
Middle magnetic, strong magnetic dry separation concentrate, which merge, is delivered to product storage bin fine crushing through belt.
5) then -50+20mm grade for obtaining step 1) is delivered to newly through one section of closed circuit crushing to -20mm through belt
Type inner tube type strong permanent-magnet separator carries out one roughing and sorts, through Belt Conveying to product storage bin fine crushing after essence mine dehydration;Tailing
Through straight line shaker+high frequency fine screen screening, building materials sale is done on sieve, sieve is lower to flow into the big well of Tailing thickening certainly.
For the straight line shaker that the step 1) uses for the double-deck A seating linear vibrating screen, straight line shaker upper sieve plate is punching steel sieve
Plate, screen size 20mm, lower window screen size are 2mm.High frequency fine screen screen size is 0.5mm.
Low intensity magnetic separation uses Wet-type permanent magnet drum type magnetic separator, magnetic field strength 0.2T in the step 2);High intensity magnetic separation uses
Slon founds ring pulsating high gradient intensity magnetic separator, magnetic field strength 0.2T.
Middle magnetic separation is using magnetomechanical in Wet-type permanent magnet drum type, magnetic field strength 0.4T in the step 3);High intensity magnetic separation uses
SLon founds ring pulsating high gradient coarse granule intensity magnetic separator, magnetic field strength 0.5T.
Middle magnetic dry separation is using magnetic field dry-dressing machine in permanent-magnet chamber type, magnetic field strength 0.4T in the step 4);Strong magnetic is dry
Choosing uses permanent magnetic roll type strong magnetic dry separator, magnetic field strength 1.0T.
High-intensity magnetic separation uses New type wet inner tube type strong permanent-magnet separator in the step 5), and Beneficiation flowsheet is primary thick
Choosing, magnetic field strength 0.4T.
For the straight line shaker screen size that the step 5) uses for 2mm, high frequency fine screen screen size is 0.5mm.
Above-mentioned dusting cover screen size, magnetic induction intensity, the occurrence for sorting the parameters such as number, feed particle size, can basis
Ore properties are determined by laboratory results.
It should be noted that above-described embodiment, is not intended to limit the scope of protection of the present invention, in above-mentioned technical proposal
On the basis of made equivalents or substitution each fall within the range that the claims in the present invention are protected.
Claims (6)
1. a kind of fine pre-selection technique of the red water chestnut compound iron ore of magnetic, which is characterized in that the pre-selection technique the following steps are included:
1) broken product is -50mm by, is sieved through straight line shaker, three acquisition -50+20mm, -20+2mm, -2mm grades, wherein -
2mm grade is sieved through high frequency fine screen again, acquisition -2+0.5mm grade, -0.5mm grade, i.e., in broken product be classified to 4 grains
Grade: -50+20mm, -20+2mm, -2+0.5mm, -0.5mm;
2) the concentrated machine of -0.5mm grade obtained step 1) is concentrated, then is delivered to Wet-type permanent magnet drum type magnetic separator with Pulp pump
Carry out low intensity magnetic separation;Low intensity magnetic separation tailing flows into certainly enters Verticle ring pulsating high gradient high intensity magnetic separator progress high intensity magnetic separation every slag sieve after slag;
3) -2+0.5mm the grade for obtaining step 1) is delivered to magnetic separation in the progress of Wet-type permanent magnet drum type magnetic separator through Pulp pump;
Middle magnetic tailing founds ring pulsating high gradient coarse granule magnetic separator progress high intensity magnetic separation from SLon is flowed into;
4) -20+2mm the grade for obtaining step 1) is delivered to magnetic dry separation in the progress of dry type permanent-magnet drum type magnetic separator through belt;In
Magnetic dry separation tailing carries out strong magnetic dry separation into roll-type strong magnetic dry separator by ore discharge funnel;
5) -50+20mm the grade for obtaining step 1), first through one section of closed circuit crushing to -20mm, by Belt Conveying to novel interior
Drum high intensity magnetic separator carries out one roughing and sorts, and concentrate is after being dehydrated through Belt Conveying to product storage bin fine crushing.
2. the fine pre-selection technique of the red water chestnut compound iron ore of magnetic according to claim 1, which is characterized in that the step 1)
For the straight line shaker used for the double-deck A seating linear vibrating screen, straight line shaker upper sieve plate is punched screens, screen size 20mm, lower sieve
Board size is 2mm, and high frequency fine screen screen size is 0.5mm.
3. the fine pre-selection technique of the red water chestnut compound iron ore of magnetic according to claim 2, which is characterized in that the step 2)
Middle low intensity magnetic separation uses Wet-type permanent magnet drum type magnetic separator, magnetic field strength 0.2T;High intensity magnetic separation is strong using the vertical ring pulsating high gradient of Slon
Magnetic separator, magnetic field strength 0.2T.
4. the fine pre-selection technique of the red water chestnut compound iron ore of magnetic according to claim 3, which is characterized in that the step 3)
In middle magnetic separation using magnetomechanical in Wet-type permanent magnet drum type, magnetic field strength 0.4T;High intensity magnetic separation is thick using the vertical ring pulsating high gradient of SLon
Particle intensity magnetic separator, magnetic field strength 0.5T.
5. the fine pre-selection technique of the red water chestnut compound iron ore of magnetic according to claim 4, which is characterized in that the step 4)
In middle magnetic dry separation using magnetic field dry-dressing machine in permanent-magnet chamber type, magnetic field strength 0.4T;Strong magnetic dry separation is dry using the strong magnetic of permanent magnetic roll type
Select machine, magnetic field strength 1.0T.
6. the fine pre-selection technique of the red water chestnut compound iron ore of magnetic according to claim 4, which is characterized in that the step
5) high-intensity magnetic separation uses novel inner tube type strong permanent-magnet separator in, and Beneficiation flowsheet is one roughing, magnetic field strength 0.4T;It is described
The straight line shaker screen size that uses of step 5) for 2mm, high frequency fine screen screen size is 0.5mm.
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Application publication date: 20190618 |