CN109482338A - A kind of beneficiation method of the narrow gradation of magnetic iron ore, the independent ore grinding of chats - Google Patents

A kind of beneficiation method of the narrow gradation of magnetic iron ore, the independent ore grinding of chats Download PDF

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Publication number
CN109482338A
CN109482338A CN201811570635.XA CN201811570635A CN109482338A CN 109482338 A CN109482338 A CN 109482338A CN 201811570635 A CN201811570635 A CN 201811570635A CN 109482338 A CN109482338 A CN 109482338A
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China
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magnetic
grinding
concentrate
ore
chats
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钱士湖
陆虎
翁金红
赵振明
李明军
杨松付
开锐
张伟
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Magang Group Mining Industry Co Ltd
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Magang Group Mining Industry Co Ltd
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Priority to CN201811570635.XA priority Critical patent/CN109482338A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00Disintegrating plant with or without drying of the material

Abstract

The invention belongs to iron ore dressing technical fields, are related to a kind of beneficiation method, and in particular to the beneficiation method of a kind of narrow gradation of magnetic iron ore, the independent ore grinding of chats.This method includes raw ore pretreatment, narrow gradation and chats three processes of independent ore grinding, and by primary grinding classification, a magnetic separation, secondary magnetic separation-concentration magnetic separation, secondary grinding classification, magnetic separation obtains iron ore concentrate three times.The present invention is able to achieve under thicker grinding fineness, and qualified concentrate is preferentially selected using narrow rank magnetic separation, and the hardly possible ore grinding object such as underproof intergrowth is separated with main flow, independent ore grinding with sort, avoid concentrate from mixing with chats, influence ore grinding and sort efficiency;Under the premise of guaranteeing Iron Concentrate Quality and the rate of recovery, secondary grinding fine grinding mine amount is greatly decreased, provides the approach of an economical rationality for the exploitation of magnetic iron ore.

Description

A kind of beneficiation method of the narrow gradation of magnetic iron ore, the independent ore grinding of chats
Technical field:
The invention belongs to iron ore dressing technical fields, are related to a kind of beneficiation method, and in particular to a kind of narrow grade of magnetic iron ore Not Fen Xuan, the beneficiation method of the independent ore grinding of chats.
Background technique:
The characteristics of China's iron ore deposit " poor, thin, miscellaneous ", increases great difficulty, vast ore dressing worker face to ore dressing processing To this reality, by the unremitting effort of decades, many technical problems are fruitfully captured, have made China's iron ore beneficiation skill Art obtains rapid progress and development, and aggregate level improves a lot.
Magnetite separation technology is mainly " stage grinding-stage low intensity magnetic separation " ore dressing side using single low intensity magnetic separation at present Method.In order to improve iron concentrate grade and the rate of recovery, it is new that some dressing plants use fine screening classification equipment, column magnetic separator and wash mill etc. Type weak magnetic separation equipment, but from the point of view of the case where it runs in production practice, there is also following several respects problems: first is that one section of mill Wholegrain grade product after mine classification enters weak magnetic separator and is sorted, and no selection can occur for fine-grained minerals and coarse fraction mineral Property absorption covering and more coarsely graded gangue mineral easily enter concentrate product, and fine-grained minerals washability is poor, will affect essence The grade of mineral products closes the rate of recovery;Second is that primary grinding sort after concentrate in have the monomer particulate magnetic mineral of part qualification into Enter secondary grinding system and cause overground phenomenon, regrind rear fine particles, brings difficulty to sorting, energy consumption height causes production cost It is high;Third is that the concentrate product that dusting cover oversize or tailing are scanned is mainly intergrowth mineral, secondary grinding system is returned, Systemic circulation is accumulated in process, and ore grinding circulating load increases, and causes to produce unstable, deterioration production target.
Application No. is the Chinese patent literatures of CN201710624896.4 to disclose a kind of improvement micro fine particle magnetite stone rank Section mill selects the beneficiation method of sorting index, and magnet green ore is by primary grinding classification, a magnetic separation, secondary grinding classification, two Into column magnetic separator under sieving after secondary magnetic separation, high frequency fine screen classification, the upper part of high frequency fine screen sieve and column magnetic separator tailing are pumped to concentration magnetic separation Machine carries out concentration magnetic separation, concentrate is concentrated after three sections of grind gradings, into three, four magnetic separation, by column magnetic separator concentrate, four magnetic separation essences Mine merges into final total concentrate.The method selects technique using three sections of mills, and process flow is complicated, and grind grading product wholegrain is grading Row magnetic separation, sorting result are poor.
Application No. is the Chinese patent literatures of CN201210015609.7 to disclose the beneficiation method of magnetic composite ore, this side Two sections of weak magnetic concentrate selections pass through cation reverse flotation or anion reverse floatation in method, obtain iron ore concentrate I and chats, and chats passes through three Enter low intensity magnetic separation after section ore grinding Ultrafine Grinding, obtains iron ore concentrate II, iron ore concentrate I and iron ore concentrate II are merged into final iron ore concentrate.The party Method isolates consecutive victories body with the method for reverse flotation under thicker grinding particle size, is not the narrow rank low intensity magnetic separation that the present invention uses.
It discloses one kind application No. is the Chinese patent literature of CN201310729568.2 and can eliminate light mineral coarse granule and exist The ore-dressing technique of the grind grading of Infinite Cyclic in grinding classification system, cyclone overflow is sieved by high frequency fine screen in the technique Point, lower part of screen is divided into qualified grain size, and part returns to former grinding classification system on sieve, is grinding although being able to solve light mineral coarse granule Infinite Cyclic problem in mine hierarchy system, but the other parts in oversize can accumulate in systemic circulation on stream, ore grinding circulation Load increases.
Application No. is the Chinese patent literatures of CN201210352536.0 to disclose a kind of lean hematite gradation grade, narrow rank Sorting process is realized and uses two sections of cyclone classifications, gravity treatments to an ore milling product, obtains three kinds of grade products, feed respectively Subsequent sorting operation realizes gradation grade, narrow gradation, but intergrowth does not embody independent ore grinding and individually sorts in process.
Summary of the invention:
To solve above-mentioned technical problem, the present invention provides a kind of narrow gradation of magnetic iron ore, the independent ore grinding of chats Beneficiation method, using preferably sub-electing part qualification iron ore concentrate with narrow rank under thicker grinding fineness in ore dressing, and right The hardly possible independent ore grinding of ore grinding object such as intergrowth and individually sorting.
The technical solution that the present invention solves technical problem is as follows:
The beneficiation method of a kind of narrow gradation of magnetic iron ore, the independent ore grinding of chats, it specifically comprises the following steps:
1) by magnet green ore successively through coarse crushing, in it is broken and fine crushing after, then preselect to obtain into mill concentrate;
2) it will enter to grind concentrate and carry out primary grinding operation, and then carry out a magnetic separation again, a magnetic tailing is discharged, obtain Magnetic concentrate;
3) a magnetic concentrate is subjected to one section of cyclone classification operation, obtained hydrocyclone sand returns to primary grinding shape Continue grinding operation at closed circuit, obtained cyclone overflow carries out high frequency fine screen screening operation;
4) secondary magnetic separation is successively carried out by the lower part of screen of high frequency fine screen screening operation point and a high-efficiency precision is elected to be industry, row Secondary magnetic tailing out obtains efficient selected iron ore concentrate I;
5) tailing that part and a high-efficiency precision are elected to be industry on the sieve of high frequency fine screen screening operation concentration magnetic separation is carried out to make Industry, discharge concentration magnetic tailing;
6) concentrate by concentration magnetic separation in step 5) carries out two sections of cyclone classification operations, obtains cyclone overflow in Mine;
7) secondary grinding operation is carried out to chats obtained in step 6) and returns to the product after ore grinding to two sections of eddy flows Device, which is formed hierarchically, closed circuit continues operation;
8) cyclone overflow obtained in step 6) is successively subjected to magnetic separation three times and secondary high-efficiency precision is elected to be industry, discharge three Secondary magnetic tailing obtains efficient selected iron ore concentrate II;
9) tailing for being elected to be industry by secondary high-efficiency precision is back to concentration magnetic separation and carries out operation;
10) efficiently selected iron ore concentrate I and efficient selected iron ore concentrate II are merged into final total concentrate, by a magnetic separation tail Mine, secondary magnetic tailing, concentration magnetic tailing and magnetic tailing merges into total tailing three times.
Further, described to enter to grind concentrate as 0-5mm.
Further, a magnetic separation, secondary magnetic separation, concentration magnetic separation and three times magnetic separation all use Wet-type permanent magnet drum type Magnetic separator, magnetic field strength are respectively 0.22-0.27T, 0.18-0.20T, 0.30-0.35T and 0.18-0.20T.
Further, the primary efficiently selected and secondary high-efficiency precision be elected to be in industry using column magnetic separator or wash mill or it is complete certainly Dynamic magnetic suspension selecting machine.
Further, the screen size 0.074-0.15mm of the high frequency fine screen.
Further, the overflow granularity -0.075mm content of control one section of cyclone classification accounts for 60- in step 3) 70%;Overflow granularity -0.075mm the content of control two sections of cyclone classifications accounts for 85-95% in step 6).
Compared with the prior art, the invention has the following beneficial effects: this method includes raw ore pretreatment, narrow gradation With chats three processes of independent ore grinding, by primary grinding classification, a magnetic separation, secondary magnetic separation-concentration magnetic separation, secondary grinding Classification, three times magnetic separation obtain iron ore concentrate.The present invention is able to achieve under thicker grinding fineness, preferentially selects conjunction using narrow rank magnetic separation The concentrate of lattice, the hardly possible ore grinding object such as underproof intergrowth are separated with main flow, independent ore grinding with sort, avoid concentrate and chats from mixing It is miscellaneous, it influences ore grinding and sorts efficiency;Under the premise of guaranteeing Iron Concentrate Quality and the rate of recovery, secondary grinding fine grinding mine is greatly decreased Amount, provides the approach of an economical rationality for the exploitation of magnetic iron ore.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and specific embodiments:
Fig. 1 is process flow chart of the invention.
Specific embodiment
Embodiment 1
As shown in Figure 1, the beneficiation method of a kind of narrow gradation of magnetic iron ore, the independent ore grinding of chats, it specifically includes as follows Step:
1) by magnet green ore successively through crusher coarse crushing, in broken and high-pressure roller mill it is fine crushing after, then preselect to obtain 3mm's Enter to grind concentrate;
2) this is entered to grind concentrate and feeds ball mill progress primary grinding operation, then by Wet-type permanent magnet drum type magnetic separator magnetic strength Strength control carries out a magnetic separation to ore milling product again in 0.27T, and a magnetic tailing is discharged, obtains a magnetic concentrate;
3) magnetic concentrate is fed into one section of hydrocyclone and carries out graded operation, hydrocyclone sand returns to primary grinding Formed it is closed circuit continue grinding operation, cyclone overflow feeds the high frequency fine screen that screen size is 0.1mm and carries out screening operation, It obtains sieving part and lower part of screen point;
4) by Wet-type permanent magnet drum type magnetic separator magnetic strength strength control in 0.20T to the lower part of screen of the high frequency fine screen screening operation Divide and carry out secondary magnetic separation, then carry out a high-efficiency precision with wash mill and be elected to be industry, secondary magnetic tailing is discharged, obtains efficient selected iron Concentrate I;
5) tailing that part and a high-efficiency precision are elected to be industry on the sieve of the high frequency fine screen screening operation is fed into magnetic strength intensity The Wet-type permanent magnet drum type magnetic separator controlled in 0.35T carries out concentration magnetic separation, discharge concentration magnetic tailing;
6) concentrate that concentration magnetic separation obtains in step 5) is classified through two sections of hydrocyclones, obtains cyclone overflow And chats;
7) secondary grinding operation is carried out to chats obtained in step 6) and returns to the product after ore grinding to two sections of waterpower Cyclone classification forms closed circuit;
8) by cyclone overflow obtained in step 6) with magnetic strength strength control 0.20T Wet-type permanent magnet drum type magnetic separator Magnetic separation three times is carried out, then carries out secondary high-efficiency precision with wash mill and is elected to be industry, magnetic tailing three times is discharged, obtains efficiently selected iron essence Mine II;
9) tailing that industry is elected to be by secondary high-efficiency precision is returned into concentration magnetic separation;
10) efficiently selected iron ore concentrate I and efficient selected iron ore concentrate II are merged into final total concentrate, by a magnetic separation tail Mine, secondary magnetic tailing, concentration magnetic tailing and magnetic tailing merges into total tailing three times.
In the present embodiment, the overflow granularity -0.075mm content of control one section of cyclone accounts for 60- in step 3) 70%;Overflow granularity -0.075mm the content of control two sections of cyclones accounts for 85-95% in step 6).Magnetic separation be for It dishes out in advance gangue and low-grade intergrowth in primary grinding ore discharge, reduces primary grinding load.Be concentrated magnetic separation first is that in order to High frequency fine screen of dishing out sieves in upper part the gangue mineral of monomer dissociation and low-grade intergrowth, second is that in order to guarantee subsequent two The ore milling concentration of section ore grinding.
The basic principle of the beneficiation method: product after ore grinding, classification is sieved through high frequency fine screen, be divided into fine-grained minerals and Coarse fraction mine carries out narrow rank low intensity magnetic separation, in advance preferentially sorts out the monomer dissociation magnetic mineral in fine-grained minerals, obtains Low intensity magnetic separation is carried out to the efficient selected iron ore concentrate I in part, while by the upper part of sieve, cyclone overflow and chats enter secondary grinding Graded operation, independent ore grinding and sorting, obtain the efficiently selected iron ore concentrate II of another part.
Embodiment 2
By taking the magnetic iron ore of Anhui Province, China scale state owned enterprise as an example, raw ore chemistry multielement analysis the results are shown in Table 1, original The analysis of mine Fe clusters the results are shown in Table 2.
The chemical multielement analysis result (%) of table 1
Element term TFe TiO2 MFe CaO MgO SiO2
Content 38.20 0.28 31.20 5.70 6.06 17.53
Element term Al2O3 S P MnO K2O Na2O
Content 3.19 0.84 0.65 0.11 0.89 0.37
Element term Cr V2O5 Cu Zn Scaling loss
Content 0.01 0.30 0.003 0.01 7.42
2 Fe clusters of table analyze result (%)
The raw ore TFe grade 38.20% of the magnetic iron ore, mFe31.20%, design treatment ability are to handle raw ore 2,000,000 in year Ton, ore-dressing technique be grind before crushing process using crusher coarse crushing, in broken-high-pressure roller mill throwings wake flow journey fine crushing-preparatory, master Workshop mill selects technique using stage grinding-low intensity magnetic separation-fine screening classification-wash mill sorting process.Since the magnetic iron ore is fine Grain magnetic iron ore, secondary grinding need the content for being finely ground to -0.075mm up to 90% or more, and final iron concentrate grade can be only achieved 64% or so.
A kind of narrow gradation of magnetic iron ore of the present invention, the independent ore grinding of chats beneficiation method include following technique:
(1) concentrate that enters to grind of 0-5mm is sieved by mono- section of cyclone classification of a magnetic separation-of primary grinding-- high frequency fine screen Divide, secondary magnetic separation-wash mill elutriation, a magnetic tailing, secondary magnetic tailing is discharged, obtains iron ore concentrate I;The high frequency fine screen Screen size be 0.11mm, the overflow granularity -0.075mm content for controlling one section of cyclone accounts for 65% or so;Magnetic separation, two Secondary magnetic separation uses Wet-type permanent magnet drum type magnetic separator, and field strength is respectively 0.25T, 0.18T.
(2) concentration magnetic concentration working will be partially carried out on wash mill tailing and high frequency fine screen sieve, concentration magnetic concentrate feeds two Section hydroclone classification-secondary grinding forms closed circuit, and it is selected that cyclone overflow feeds magnetic separation three times, wash mill, eluriates tail Mine returns to concentration magnetic concentration working, and discharge concentration magnetic tailing, three times magnetic tailing, obtain iron ore concentrate II respectively;Magnetic separator is concentrated Using Wet-type permanent magnet drum type magnetic separator, field strength 0.30T;It controls two sections of cyclone overflow granularity -0.075mm contents and accounts for 90% left side It is right.
(3) the selected iron ore concentrate I of wash mill twice and iron ore concentrate II are merged into final total concentrate, by a magnetic separation tail Mine, secondary magnetic tailing, concentration magnetic tailing and magnetic tailing merges into total tailing three times.
In the present embodiment, the magnet green ore beneficiation method is sorted, relatively thick (- 200 mesh contents of total concentrate product granularity It is 87.87%, -400 mesh contents are 45%), compared to former total concentrate (- 200 mesh contents are 97% or so) particle size reduction nearly 10 Percentage point, master control concentrate TFe are increased to 66.80% by 64.1%, achieve significant technical effect, the results are shown in Table 3 and table 4.
Table 3 is total granularity of concentrate screen analysis result after beneficiation method is implemented;Table 4 is total granularity of concentrate sieve before beneficiation method is implemented Analyse result.
The total concentrate grade screen analysis result (%) of table 3
Grade (mm) Yield Iron grade Iron distributive law
+0.076 12.13 62.06 11.27
0.045-0.076 31.78 65.72 31.27
0.038-0.045 11.28 67.62 11.42
0.030-0.038 10.88 68.14 11.10
-0.030 33.93 68.79 34.94
It is total 100.00 66.80 100.00
The former total concentrate grade screen analysis result (%) of table 4
Grade (mm) Yield Iron grade Iron distributive law
0.076 3.94 49.66 3.06
0.076~0.038 37.91 62.8 37.14
-0.038 58.15 65.91 59.8
It is total 100 64.1 100
The parameters such as grind grading granularity, dusting cover screen size, magnetic field strength and low intensity magnetic separation operations number in the present invention Occurrence can all be determined according to ore properties by laboratory test result of study;Magnetic separator, ball mill and cyclone, height Frequency dusting cover and efficiently selected etc. equipment can carry out type selecting use, the equipment that lectotype selection does not influence ore-dressing technique system as needed Composition and process, wherein high-efficiency precision is elected to be industry and selects column magnetic separator, wash mill and Full-automatic magnetic suspension selecting machine etc. newly The efficient weak magnetic separation equipment of type reduces low intensity magnetic separation operations number, improves the efficiency of separation.
The foregoing is merely a prefered embodiment of the invention, but scope of protection of the present invention is not limited thereto, any to be familiar with sheet In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those skilled in the art, should all cover Within protection scope of the present invention.Therefore, the scope of protection of the present invention shall be subject to the scope of protection defined by the claims.
Place is not described in detail by the present invention, is the well-known technique of those skilled in the art of the present technique.

Claims (6)

1. the beneficiation method of a kind of narrow gradation of magnetic iron ore, the independent ore grinding of chats, which is characterized in that it specifically includes following step It is rapid:
1) by magnet green ore successively through coarse crushing, in it is broken and fine crushing after, then preselect to obtain into mill concentrate;
2) it will enter to grind concentrate and carry out primary grinding operation, and then carry out a magnetic separation again, a magnetic tailing is discharged, obtain primary Magnetic concentrate;
3) a magnetic concentrate is subjected to one section of cyclone classification operation, obtained hydrocyclone sand returns to primary grinding formation and closes Road continues grinding operation, and obtained cyclone overflow carries out high frequency fine screen screening operation;
4) secondary magnetic separation is successively carried out by the lower part of screen of high frequency fine screen screening operation point and a high-efficiency precision is elected to be industry, discharge two Secondary magnetic tailing obtains efficient selected iron ore concentrate I;
5) tailing that part and a high-efficiency precision are elected to be industry on the sieve of high frequency fine screen screening operation is subjected to concentration magnetic concentration working, arranged Magnetic tailing is concentrated out;
6) concentrate by concentration magnetic separation in step 5) carries out two sections of cyclone classification operations, obtains cyclone overflow and chats;
7) secondary grinding operation is carried out to chats obtained in step 6) and returns to the product after ore grinding to two sections of cyclones point Grade formation is closed circuit to continue operation;
8) cyclone overflow obtained in step 6) is successively subjected to magnetic separation three times and secondary high-efficiency precision is elected to be industry, magnetic three times is discharged Tailing is selected, efficient selected iron ore concentrate II is obtained;
9) tailing for being elected to be industry by secondary high-efficiency precision is back to concentration magnetic separation and carries out operation;
10) efficiently selected iron ore concentrate I and efficient selected iron ore concentrate II are merged into final total concentrate, by magnetic tailing, two Secondary magnetic tailing, concentration magnetic tailing and magnetic tailing merges into total tailing three times.
2. the beneficiation method of a kind of narrow gradation of magnetic iron ore according to claim 1, the independent ore grinding of chats, feature exist In described to enter to grind concentrate as 0-5mm.
3. the beneficiation method of a kind of narrow gradation of magnetic iron ore according to claim 1, the independent ore grinding of chats, feature exist In a, magnetic separation, secondary magnetic separation, concentration magnetic separation and three times magnetic separation all use Wet-type permanent magnet drum type magnetic separator, magnetic field is strong Degree is respectively 0.22-0.27T, 0.18-0.20T, 0.30-0.35T and 0.18-0.20T.
4. the beneficiation method of a kind of narrow gradation of magnetic iron ore according to claim 1, the independent ore grinding of chats, feature exist In the primary efficiently selected and secondary high-efficiency precision is elected to be in industry selected using column magnetic separator or wash mill or Full-automatic magnetic suspension Machine.
5. the beneficiation method of a kind of narrow gradation of magnetic iron ore according to claim 1, the independent ore grinding of chats, feature exist In the screen size of the high frequency fine screen is 0.074-0.15mm.
6. the beneficiation method of a kind of narrow gradation of magnetic iron ore according to claim 1, the independent ore grinding of chats, feature exist In the overflow granularity -0.075mm content of control one section of cyclone classification accounts for 60-70% in step 3);In step 6) Overflow granularity -0.075mm the content for controlling two sections of cyclone classifications accounts for 85-95%.
CN201811570635.XA 2018-12-21 2018-12-21 A kind of beneficiation method of the narrow gradation of magnetic iron ore, the independent ore grinding of chats Pending CN109482338A (en)

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CN110523504A (en) * 2019-08-21 2019-12-03 安徽金安矿业有限公司 A kind of secondary grinding method of closed cycle
CN113019681A (en) * 2021-03-22 2021-06-25 中冶北方(大连)工程技术有限公司 Grinding and selecting process for producing pellet raw material iron fine powder
WO2022095145A1 (en) * 2020-11-03 2022-05-12 安徽马钢矿业资源集团南山矿业有限公司 Simple-workflow magnetite beneficiation process and system

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WO2022095145A1 (en) * 2020-11-03 2022-05-12 安徽马钢矿业资源集团南山矿业有限公司 Simple-workflow magnetite beneficiation process and system
CN113019681A (en) * 2021-03-22 2021-06-25 中冶北方(大连)工程技术有限公司 Grinding and selecting process for producing pellet raw material iron fine powder

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