CN102773161B - Magnetic-gravity combined ore dressing technology for hematite - Google Patents

Magnetic-gravity combined ore dressing technology for hematite Download PDF

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CN102773161B
CN102773161B CN201210288117.5A CN201210288117A CN102773161B CN 102773161 B CN102773161 B CN 102773161B CN 201210288117 A CN201210288117 A CN 201210288117A CN 102773161 B CN102773161 B CN 102773161B
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magnetic
ore
strong magnetic
concentrate
dry type
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CN102773161A (en
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郭风芳
杨任新
李俊宁
黎龙珠
袁启东
王炬
李亮
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Engineering Investigation & Design Institute Of Sinosteel Maanshan Co Ltd
Hainan Mining Co Ltd
Sinosteel Maanshan General Institute of Mining Research Co Ltd
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Engineering Investigation & Design Institute Of Sinosteel Maanshan Co Ltd
Hainan Mining Co Ltd
Sinosteel Maanshan General Institute of Mining Research Co Ltd
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Abstract

The invention discloses a magnetic-gravity combined ore dressing technology for hematite, comprising the following steps of: carrying out dry magnetic separation and jigging gravity separation to obtain blast furnace lump ore, throwing the tailings of the lump ore, carrying out first-stage ore grinding, weak magnetic separation, strong magnetic separation and centrifugal gravity separation on middlings, and carrying out second-stage ore grinding, weak magnetic separation, strong magnetic separation and centrifugal gravity separation. According to the technology, part of qualified blast furnace lump ore (the iron grade is large than 54%) can be obtained in advance, the massive tailings (the iron grade is less than 12%) can be thrown out, the quantity of the ball-milled ore (the middlings) can be greatly reduced, and the grinding and separation energy consumption can be greatly reduced. The massive tailings which are thrown out can replace the macadam and the stone to be taken as the building material, so that the comprehensive utilization of the bulk quantity of the tailings resource can be realized, and the technology is prominent in emission reduction effect; and the whole ore dressing technology is the magnetic-gravity combined ore dressing technological process, so that the flotation reagents can not be consumed, the technology is very friendly to the work environment and the neighboring environment, the environment can be protected, the pollution of the beneficiation reagent to the environment caused by the flotation work can be avoided, and the technology is particularly suitable for the ore dressing of the medium and high-grade (the iron grade is more than or equal to 38%) hematite.

Description

A kind of magnetic reconnection of hematite closes ore-dressing technique technology
Technical field
The present invention relates to a kind of beneficiation method of hematite, especially relate to a kind of beneficiation combined method method of middle high-grade hematite, be specially adapted to the hematite ore dressing of middle high-grade (iron grade >=38%).
Background technology
Bloodstone is the important iron ore deposit of China, and washability is poor, is mainly distributed in the ground such as Liaoning, Hebei, Gansu, Anhui, Inner Mongol, Henan, Hubei, Shanxi, Guizhou, Hainan.Phase early 1960s, domestic main employing roasting-magnetic separation and single floatation process are processed hematite, and production and technical indication is poor.Anion reverse floatation technique that 20th century 80, the nineties successively adopt stage grinding, gravity treatment-magnetic separation-acid direct flotation and stage grinding, gravity treatment-magnetic separation-anion reverse floatation, have occurred again that in recent years two sections of Continuous Grindings, chats are regrinded, gravity treatment---strong magnetic---.
Hematite separation technology has at present: Continuous Grinding, weak magnetic-strong magnetic-anion reverse floatation technique (technique 1); Stage grinding, coarse and fine separation, gravity treatment-magnetic separation-anion reverse floatation technique (technique 2); Stage grinding, coarse and fine separation, magnetic separation-gravity treatment-anion reverse floatation technique (technique 3).Above three kinds of ore-dressing techniques all cannot obtain high-grade and enter stove lump ore before ore grinding, the mine tailing of also cannot dishing out before ore grinding, and energy consumption is high, beneficiation cost is high; And, owing to adopting floatation process, floating agent, also exist problem of environmental pollution.
The especially high-grade lump ore of lump ore is one of important iron-bearing material that blast furnace uses, and it forms the iron-containing charge structure of blast furnace together with high basicity sinter, acidic oxidation pellet, and the use of lump ore realizes Proper Burden Constitution for blast furnace and established important basis.In order to reduce the ratio of small-ball sintering mine in burden structure, reduce pig iron cost, lacking under the condition of ripe acid burden material, allocate the high-grade lump ore of proper proportion into, increase lump ore proportioning, cost equal to the improvement of the strengthening to blast furnace and index and reduction iron-smelting raw material has certain benefit.
In recent years, along with the variation of domestic and international iron ore deposit and blast furnace ferrous burden structure, rationally utilize domestic and international two kinds of iron ore deposit strategies, raising outsourcing lump ore enters stove ratio has become the trend of Bf Burden development and change, but expensive from the high-grade iron ore lump ore of external import (being generally high-grade raw ore), and be subject to purchasing ore deposit valency, lump ore grade, lump ore moisture, freight charges, to bank transport administration fee tax, enter tariff, port incidentals, storage integrated management expense, from storing in a warehouse to impacts such as the freight charges of iron-smelter, outsourcing lump ore is high directly into the cost of blast furnace process.And domestic iron ore resource that at present can production high-grade lump ore lacks, or there is no the iron ore dressing method of suitable production high-grade lump ore.
The 33rd the 1st phase of volume (in January, 2012) of Northeastern University's journal (natural science edition) discloses " research of lean hematite high pressure roller mill product wet type pre-selecting " literary composition, think " preliminary election of lean hematite at present rests on coarse grain dry type and chooses in advance; due to the impact of fine particle stage material; tailings grade is higher; the rate of recovery is lower ", and certain lean hematite is carried out to high-pressure roller mill ultra-fine grinding in advance, milling product carries out wet high-intensity magnetic preliminary election experimental study, improves the pre-concentrate selection rate of recovery, improves concentrate grade.The 6th phase of " Modern Mineral " June in 2011 discloses " the high mud lean hematite high magnetic pre-selection experimental study of Si Jia campsite district " literary composition, its research conclusion is: the strong magnetic dry type of coarse grain tailings discarding by preconcentration has certain throwing tail effect, but tailings grade is higher on the whole, metal loss is serious, and strong magnetic coarse grain dry type preliminary election technology condition waits perfectly, be not suitable for selecting factory to carry out large-scale industrial production coarse grain lump ore at the not bery high lean hematite of added value and feed former process system and process; It is better that useless effect is thrown in 2~0 mm grade wet high-intensity magnetic preliminary elections, can the dish out qualified tailings of operation productive rate approximately 50% (whole process productive rate approximately 25%) of the wet high-intensity magnetic preliminary election of 2~0 mm grades that fine ore amount accounting is larger, both can reduce follow-up mill ore dressing amount, improve follow-up ore grinding grade.The hematite pre-selection method of above-mentioned Introduction of Literatures, can improve preliminary election concentrate grade and the part mine tailing of dishing out, but cannot obtain high-grade, can be directly into the high-grade bloodstone lump ore of stove.
Summary of the invention
Object of the present invention is exactly for the above-mentioned problems in the prior art, and provide one can not only before ore grinding, produce blast furnace lump ore, and the lump ore mine tailing of can dishing out before ore grinding, the magnetic reconnection of the hematite of energy-saving and environmental protection closes ore-dressing technique technology, not only can produce early economic benefit, can also significantly reduce mill and select energy consumption.
For achieving the above object, the magnetic reconnection of a kind of hematite of the present invention closes ore-dressing technique technology and comprises following technique, step:
1) dry type magnetic separation, jigging obtain blast furnace lump ore, the lump ore mine tailing operation of dishing out: the hematite of iron grade >=38% feeds graded operation through crushing operation, is classified into the material of 40 ~ 10mm, two grades of-10mm; The material of 40 ~ 10mm grade carries out respectively that the strong magnetic of dry type is roughly selected, strong magnetic of dry type is scanned, the strong magnetic of secondary dry type is scanned, obtain respectively the strong magnetic of dry type and roughly select concentrate, the strong magnetic scavenger concentrate of dry type, the strong magnetic scavenger concentrate of secondary dry type and a lump ore mine tailing, the strong magnetic of dry type is roughly selected concentrate, the strong magnetic scavenger concentrate of dry type, the strong magnetic scavenger concentrate of secondary dry type feed jigging operation after merging, and obtains blast furnace lump ore; Jigging mine tailing is merged into chats with the material of-10mm grade;
2) primary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation: the chats that above-mentioned operation is obtained feeds primary grinding operation, pass through again roughly select-strong magnetic of low intensity magnetic separation-strong magnetic and scan operation processing, dishing out one section to grind selects strong magnetic to scan mine tailing, low intensity magnetic separation concentrate, strong magnetic are roughly selected after concentrate, strong magnetic scavenger concentrate merging, feed centrifugal reselection machine and carry out gravity treatment, obtain one section of mill and select centrifugal reselection concentrate, one section of centrifugal reselection chats;
3) secondary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation: one section of centrifugal reselection chats that above-mentioned operation is obtained feeds secondary grinding operation, pass through again low intensity magnetic separation, high intensity magnetic separation, centrifugal reselection operation processing, the two sections of mills of dishing out select high intensity magnetic separation mine tailing, two sections of mills to select centrifugal reselection mine tailing, obtain two sections of mills and select centrifugal reselection concentrate;
4) one section of mill selects centrifugal reselection concentrate, two sections of mills to obtain final gravity concentrate after selecting centrifugal reselection concentrate to merge; One section of mill selects strong magnetic to scan mine tailing, two sections of mills and selects high intensity magnetic separation mine tailing, two sections of mills to select centrifugal reselection mine tailing to merge into mill to select mine tailing.
The 1st) the lump ore mine tailing that obtains of step can be used as rubble, stone is sold as building material product, and also can select mine tailing to merge with mill and to obtain total mine tailing.
The magnetic plant that the strong magnetic of above-mentioned dry type roughly selects, strong magnetic of dry type is scanned, the strong magnetic of secondary dry type is scanned operation adopts dry type high field intensity permanent magnetic separator, and surface induction intensity is 0.75 ~ 0.85T;
The stroke of above-mentioned jigging is 60 ~ 120mm, and the best is 90 ~ 110mm; Jig frequency is 80 ~ 160 beats/min, and the best is 130 ~ 150 beats/min.
The mog of first paragraph grinding operation is advisable with-0.076mm >=90%, and the mog of second segment grinding operation is taking-0.045mm85% as good.
The low intensity magnetic separation magnetic field intensity of primary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation is that the magnetic field intensity that 140 ~ 170 kA/m, strong magnetic are roughly selected is that the magnetic field intensity that 600 ~ 700 kA/m, strong magnetic are scanned is 750 ~ 850 kA/m;
Low intensity magnetic separation magnetic field intensity 140 ~ 170 kA/m of secondary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation, magnetic field intensity 600 ~ 700 kA/m of high intensity magnetic separation.
The centrifugal ore separator rotating speed of above-mentioned centrifugal reselection operation is 400 ~ 500 revs/min.
The magnetic reconnection of a kind of hematite of the present invention closes after ore-dressing technique technology adopts above technical scheme and has the following advantages:
(1) this technique not only can obtain the qualified blast furnace lump ore of part (iron grade is greater than 54%) but also the block mine tailing of can dishing out (iron grade is less than 12%) in advance, goal ore grinding amount (chats) can significantly reduce, can significantly reduce mill and select energy consumption, improving the ore ferrous metal rate of recovery, is one of important breakthrough of hematite technique of preparing.
(2) the block mine tailing of dishing out can substitute rubble, stone as construction material, has realized the large argument comprehensive utilization of resource of tailings, and emission reduction effect is remarkable.
(3) enter and grind the selected amount of chats that is elected to be industry less than 50% of raw ore amount, not only significantly reduce mill and select energy consumption, also reduced the number of devices of subsequent job, reduced equipment investment.
(4) compared with existing technological process; because whole ore-dressing technique is that magnetic reconnection closes mineral processing circuit, do not consume floating agent, very friendly to operating environment and surrounding enviroment; protect environment, avoided flotation operation because adopt beneficiation reagent pollution on the environment.
Brief description of the drawings
Fig. 1 be the present invention adopt dry type magnetic separation, jigging obtain blast furnace lump ore, the lump ore mine tailing operation of dishing out counts quality process figure.
Fig. 2 is middling regrinding and reprocessing " two stage grinding, weak magnetic, Qiang Ci, centrifugal reselection operation " the number quality process figure that the present invention adopts.
Detailed description of the invention
For further describing the present invention, below in conjunction with drawings and Examples, the magnetic reconnection of a kind of hematite of the present invention is closed to ore-dressing technique technology and be described further.
The ore of processing in the present embodiment is Hainan mining industry limited company stope actual production ore, and raw ore iron grade is 39.16%.
Raw ore is carried out to multielement analysis and iron material phase analysis, the results are shown in Table 1, table 2.
Analysis result shows, in ore, main valuable mineral is hematite-limonite, is secondly magnetic iron ore, and ferric carbonate, ferrosilite and pyrite content are lower, and the iron of hematite-limonite accounts for 82.28%.Objectionable impurities sulfur content is 0.117%, and phosphorus content is lower, (CaO+MgO)/(SiO 2+ Al 2o 3)=0.176 is acid drift.
Table 1 raw ore multielement analysis result (%)
Element TFe FeO SFe SiO 2 Al 2O 3 CaO MgO S P Scaling loss
Content 39.08 3.51 38.29 30.53 3.10 3.71 2.22 0.117 0.044 2.89
Table 2 raw ore iron material phase analysis result (%)
Iron grade 39.46%, granularity 40~10 ㎜ grade samples are carried out to dry high-magnetic separation preliminary election test, adopt Φ 300 × 260mm dry type high field intensity permanent magnetic separator, surface induction intensity is 0.8T.Experiment process is that one roughing, secondary are scanned.Result of the test shows, to 40~10 ㎜ grade raw ores, adopt one roughing, secondary scan dry high-magnetic separation flow process throw useless after, the mine tailing of productive rate 23.38%~26.77%, the iron grade 10.43%~14.10% of can dishing out, iron concentrate grade can bring up to 50.47%~50.56%, do not reach more than 54% iron concentrate grade of grade, the mine tailing that it is qualified that dry high-magnetic separation can only be dished out is described and can not obtains qualified blast furnace lump ore.
Iron grade 39.46%, granularity 40~10 ㎜ grade samples are carried out jigging test, and are subsequent job production sample.Jigging test jig frequency is that 140 beats/min, stroke are 100mm, and experiment process is that a sorting test the results are shown in Table 3.
Table 3 jigging mill trial results (%)
Result of the test shows, after adopting jigging to sort, can obtain the blast furnace lump ore of productive rate 32.29%, iron grade 54.25%, iron recovery 44.27%, and blast furnace lump ore grade has met the requirement of blast furnace lump ore to iron grade; But the Iron Grade of Tailings after jigging sorts is higher, can not abandon as mine tailing, need reclaim.
Known from result of the test above: dry high-magnetic separation can tailings discarding by preconcentration, jigging can be in advance concentrate.Therefore 40~10 ㎜ grade samples are carried out the preliminary election test of dry high-magnetic separation and jigging combination, with reach not only tailings discarding by preconcentration but also in advance the object of concentrate.
The dry high-magnetic separation concentrate that dry high-magnetic separation preliminary election is obtained, carries out jigging test, and jigging stroke is 100mm, and jig frequency is 140 beats/min, and result of the test is in table 4.
Table 4 dry high-magnetic separation concentrate-jigging result of the test (%)
Result of the test shows, dry high-magnetic separation concentrate is carried out to jigging test, can obtain iron grade and be 55.35% blast furnace lump ore, and operation productive rate reaches 49.13%.
" dry type magnetic separation, jigging obtain blast furnace lump ore, the lump ore mine tailing operation of dishing out " of the final optimum organization obtaining as shown in Figure 1, final lump ore iron grade 55.35%, the productive rate 35.26% obtaining, and the lump ore mine tailing of the productive rate 21.61% of having dished out, iron grade 10.83%, the chats productive rate that enter follow-up mill, is elected to be industry is only 43.13%, because goal ore grinding amount significantly reduces, and power consume accounts for 70% of whole ore dressing energy consumption, therefore mineral processing circuit effects of energy saving and emission reduction provided by the invention is very remarkable.
Middling regrinding and reprocessing " two stage grinding, weak magnetic, Qiang Ci, centrifugal reselection operation " the number quality process figure that the present invention as shown in Figure 2 adopts finds out, " chats " that Fig. 1 flow process is obtained feeds " two stage grinding, weak magnetic, Qiang Ci, centrifugal reselection operation ", the mog of primary grinding is-0.076mm95% that the mog of secondary grinding is-0.045mm90%.
The low intensity magnetic separation magnetic field intensity of primary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation is that the magnetic field intensity that 159.15 kA/m, strong magnetic are roughly selected is that the magnetic field intensity that 636.62 kA/m, strong magnetic are scanned is 795.77 kA/m;
The low intensity magnetic separation magnetic field intensity 159.15kA/m of secondary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation, magnetic field intensity 636.62 kA/m of high intensity magnetic separation.
The centrifugal ore separator rotating speed of above-mentioned centrifugal reselection operation is 450 revs/min, and pulp density is 15%.
Research shows, close ore-dressing technique technology by the magnetic reconnection of a kind of hematite provided by the invention, can obtain in advance the blast furnace lump ore of productive rate 35.26%, iron grade 55.35%, iron recovery 49.85%, and the block mine tailing of the productive rate 21.61% of dishing out in advance, iron grade 10.83%; Mill choosing part obtains the concentrate selection of productive rate 16.51%, iron grade 63.54%, iron recovery 26.79%, and total concentrate rate of recovery improves 10.52 percentage points with direct mill phase selection ratio.
The blast furnace lump ore that experimental study obtains and gravity concentrate multielement analysis result are respectively in table 5 and table 6.
Table 5 blast furnace lump ore multielement analysis result (%)
Table 6 gravity concentrate multielement analysis result (%)

Claims (4)

1. the magnetic reconnection of hematite closes an ore-dressing technique technology, it is characterized in that comprising following technique, step:
1) dry type magnetic separation, jigging obtain blast furnace lump ore, the lump ore mine tailing operation of dishing out: the hematite of iron grade >=38% feeds graded operation through crushing operation, is classified into the material of 40 ~ 10mm, two grades of-10mm; The material of 40 ~ 10mm grade carries out respectively that the strong magnetic of dry type is roughly selected, strong magnetic of dry type is scanned, the strong magnetic of secondary dry type is scanned, obtain respectively the strong magnetic of dry type and roughly select concentrate, the strong magnetic scavenger concentrate of dry type, the strong magnetic scavenger concentrate of secondary dry type and a lump ore mine tailing, the strong magnetic of dry type is roughly selected concentrate, the strong magnetic scavenger concentrate of dry type, the strong magnetic scavenger concentrate of secondary dry type feed jigging operation after merging, and obtains blast furnace lump ore; Jigging mine tailing is merged into chats with the material of-10mm grade; The magnetic plant that the strong magnetic of described dry type roughly selects, strong magnetic of dry type is scanned, the strong magnetic of secondary dry type is scanned operation adopts dry type high field intensity permanent magnetic separator, and surface induction intensity is 0.75 ~ 0.85T; The stroke of described jigging is 60 ~ 120mm, and jig frequency is 80 ~ 160 beats/min;
2) primary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation: the chats that above-mentioned operation is obtained feeds primary grinding operation, pass through again roughly select-strong magnetic of low intensity magnetic separation-strong magnetic and scan operation processing, dishing out one section to grind selects strong magnetic to scan mine tailing, low intensity magnetic separation concentrate, strong magnetic are roughly selected after concentrate, strong magnetic scavenger concentrate merging, feed centrifugal reselection machine and carry out gravity treatment, obtain one section of mill and select centrifugal reselection concentrate, one section of centrifugal reselection chats; The low intensity magnetic separation magnetic field intensity of this section of operation is that the magnetic field intensity that 140 ~ 170 kA/m, strong magnetic are roughly selected is that the magnetic field intensity that 600 ~ 700 kA/m, strong magnetic are scanned is 750 ~ 850 kA/m;
3) secondary grinding, weak magnetic, Qiang Ci, centrifugal reselection operation: one section of centrifugal reselection chats that above-mentioned operation is obtained feeds secondary grinding operation, pass through again low intensity magnetic separation, high intensity magnetic separation, centrifugal reselection operation processing, the two sections of mills of dishing out select high intensity magnetic separation mine tailing, two sections of mills to select centrifugal reselection mine tailing, obtain two sections of mills and select centrifugal reselection concentrate; Low intensity magnetic separation magnetic field intensity 140 ~ 170 kA/m of this section of operation, magnetic field intensity 600 ~ 700 kA/m of high intensity magnetic separation;
4) one section of mill selects centrifugal reselection concentrate, two sections of mills to obtain final gravity concentrate after selecting centrifugal reselection concentrate to merge; One section of mill selects strong magnetic to scan mine tailing, two sections of mills and selects high intensity magnetic separation mine tailing, two sections of mills to select centrifugal reselection mine tailing to merge into mill to select mine tailing.
2. the magnetic reconnection of a kind of hematite as claimed in claim 1 closes ore-dressing technique technology, it is characterized in that: the stroke of described jigging is 90 ~ 110mm, and jig frequency is 130 ~ 150 beats/min.
3. the magnetic reconnection of a kind of hematite as claimed in claim 1 or 2 closes ore-dressing technique technology, it is characterized in that: the mog of first paragraph grinding operation is with-0.076mm >=90%, and the mog of second segment grinding operation is with-0.045mm85%.
4. the magnetic reconnection of a kind of hematite as claimed in claim 3 closes ore-dressing technique technology, it is characterized in that: the centrifugal ore separator rotating speed of described centrifugal reselection operation is 400 ~ 500 revs/min.
CN201210288117.5A 2012-08-14 2012-08-14 Magnetic-gravity combined ore dressing technology for hematite Expired - Fee Related CN102773161B (en)

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