CN102773161A - Magnetic-gravity combined ore dressing technology for hematite - Google Patents

Magnetic-gravity combined ore dressing technology for hematite Download PDF

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CN102773161A
CN102773161A CN2012102881175A CN201210288117A CN102773161A CN 102773161 A CN102773161 A CN 102773161A CN 2012102881175 A CN2012102881175 A CN 2012102881175A CN 201210288117 A CN201210288117 A CN 201210288117A CN 102773161 A CN102773161 A CN 102773161A
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magnetic
ore
strong magnetic
concentrate
dry type
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CN102773161B (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 bloodstone stone closes the ore-dressing technique technology
Technical field
The present invention relates to a kind of beneficiation method of bloodstone stone, especially relate to a kind of beneficiation combined method method of middle high-grade bloodstone stone, be specially adapted to the bloodstone stone ore dressing of middle high-grade (iron grade >=38%).
Background technology
Bloodstone is the important iron ore deposit of China, and washability is poor, mainly is distributed in 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 handled bloodstone stone, and production and technical indication is relatively poor.Successively adopt 20th century 80, the nineties stage grinding, gravity treatment-magnetic separation-acid direct flotation and stage grinding, gravity treatment-magnetic separation-anion reverse floatation, have occurred again in recent years that two sections continuous ore grindings, chats are regrinded, gravity treatment---strong magnetic---anion reverse floatation technology.
The hematite separation technology has at present: continuous ore grinding, weak magnetic-strong magnetic-anion reverse floatation technology (technology 1); Stage grinding, coarse and fine separation, gravity treatment-magnetic separation-anion reverse floatation technology (technology 2); Stage grinding, coarse and fine separation, magnetic separation-gravity treatment-anion reverse floatation technology (technology 3).More than three kinds of ore-dressing techniques, all can't before ore grinding, obtain high-grade and go into the stove lump ore, the mine tailing of also can't before ore grinding, dishing out, energy consumption is high, beneficiation cost is high; And, owing to adopt 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 of using of blast furnace, and it constitutes the iron-containing charge structure of blast furnace with high basicity sinter, acidic oxidation pellet, and the blast furnace that is used for of lump ore realizes that reasonable burden structure established important basis.In order to reduce the ratio of small-ball sintering mine in burden structure; Reduce pig iron cost, under the condition that lacks ripe acid burden material, allocate the high-grade lump ore of proper proportion into; Increase the lump ore proportioning, the cost that the improvement to the reinforcement of blast furnace and index is all reached the reduction iron-smelting raw material has certain benefit.
In recent years; Variation along with domestic and international iron ore deposit and blast furnace ferrous burden structure; Rationally utilize domestic and international two kinds of iron ore deposit strategies; Improve the outsourcing lump ore and go into the trend that the stove ratio has become the variation of blast furnace burden structural development; But cost an arm and a leg from the high-grade iron ore lump ore of external import (being generally high-grade raw ore), and receive the ore deposit valency of purchasing, lump ore grade, lump ore moisture, freight charges, to bank transport administration fee tax, go into tariff, port incidentals, storage integrated management expense, from storing in a warehouse to the influences such as freight charges of iron-smelter, the outsourcing lump ore is directly into the cost height of blast furnace process.And domestic iron ore resource that at present can production high-grade lump ore lacks, and does not perhaps have the iron ore dressing method of suitable production high-grade lump ore.
Northeastern University's journal (natural science edition) the 33rd volume the 1st phase (in January, 2012) 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 in the preliminary election of coarse grain dry type; because the influence of fine particle stage material; tailings grade is higher, and the rate of recovery is lower ", and certain lean hematite is carried out the high-pressure roller mill ultra-fine grinding in advance; Milling product carries out wet high-intensity magnetic preliminary election experimental study, improves the preliminary election concentrate rate of recovery, improves concentrate grade.The 6th phase of " modern mining industry " 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, is not suitable for selecting factory to carry out large-scale industrial production coarse grain lump ore at the not really high lean hematite of added value and feeds former process system and handle; 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 about 50% (whole process productive rate about 25%) of the wet high-intensity magnetic preliminary election of 2~0 mm grades that fine ore amount accounting is bigger both can reduce follow-up mill ore dressing amount, improve follow-up ore grinding grade.The bloodstone stone pre-selection method that above-mentioned document is introduced can improve the preliminary election concentrate grade and the part mine tailing of dishing out, but can't obtain high-grade, can be directly into the high-grade bloodstone lump ore of stove.
Summary of the invention
The object of the invention is exactly to the problems referred to above that exist in the prior art; And a kind of blast furnace lump ore of can not only before ore grinding, producing is provided; And the lump ore mine tailing of can before ore grinding, dishing out; The magnetic reconnection of the bloodstone stone of energy-saving and environmental protection closes the ore-dressing technique technology, not only can produce economic benefit early, can also reduce mill significantly and select energy consumption.
For achieving the above object, the magnetic reconnection of a kind of bloodstone stone of the present invention closes the ore-dressing technique technology and comprises following technology, step:
1) dry type magnetic separation, jigging gravity treatment get blast furnace lump ore, the lump ore mine tailing operation of dishing out: the bloodstone stone of iron grade >=38% feeds graded operation through crushing operation, be classified into 40 ~ 10mm ,-material of 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 the strong magnetic of dry type respectively 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 the jigging reselection operation after merging, and obtains blast furnace lump ore; The jigging gravity tailings is merged into chats with the material of-10mm grade;
2) primary grinding, weak magnetic, strong magnetic, centrifugal reselection operation: the chats that above-mentioned operation is obtained feeds the primary grinding operation; Pass through low intensity magnetic separation-strong magnetic again to roughly select-magnetic is scanned the operation processing by force; Dishing out one section to grind selects strong magnetic to scan mine tailing; Low intensity magnetic separation concentrate, strong magnetic feed the centrifugal reselection machine and carry out gravity treatment after roughly selecting concentrate, strong magnetic scavenger concentrate merging, obtain one section mill and select centrifugal reselection concentrate, one section centrifugal reselection chats;
3) secondary grinding, weak magnetic, strong magnetic, centrifugal reselection operation: one section centrifugal reselection chats that above-mentioned operation is obtained feeds the secondary grinding operation; Handle through low intensity magnetic separation, high intensity magnetic separation, centrifugal reselection operation again; The two sections mills of dishing out select high intensity magnetic separation mine tailing, two sections mills to select the centrifugal reselection mine tailing, obtain two sections mills and select the centrifugal reselection concentrate;
4) one section mill selects centrifugal reselection concentrate, two sections mills to get final gravity concentrate after selecting the centrifugal reselection concentrate to merge; One section mill selects strong magnetic to scan mine tailing, two sections mills and selects high intensity magnetic separation mine tailing, two sections mills to select the 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, also can with mill select mine tailing merge 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 gravity treatment is 60 ~ 120mm, and the best is 90 ~ 110mm; Jig frequency is 80 ~ 160 times/minute, and the best is 130 ~ 150 times/minute.
The mog of first section grinding operation is advisable with-0.076mm >=90%, the mog of second section grinding operation with-0.045mm85% is good.
The low intensity magnetic separation magnetic field intensity of primary grinding, weak magnetic, strong magnetic, 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;
Secondary grinding, weak magnetic, strong magnetic, low intensity magnetic separation magnetic field intensity 140 ~ 170 kA/m of 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 rev/mins.
The magnetic reconnection of a kind of bloodstone stone of the present invention closes and has the following advantages after the ore-dressing technique technology adopts above technical scheme:
(1) this technology not only can obtain qualified blast furnace lump ore of part (the iron grade is greater than 54%) but also the block mine tailing of can dishing out (the iron grade is less than 12%) in advance; Goal ore grinding amount (chats) can significantly reduce; Can reduce mill significantly and select energy consumption; Improving the ore ferrous metal rate of recovery, is one of important breakthrough of bloodstone stone technique of preparing.
(2) the block mine tailing of dishing out can substitute rubble, stone as construction material, has realized the big argument comprehensive utilization of mine tailing resource, and emission reduction effect is remarkable.
(3) get into selected the measuring of chats that mill is elected to be industry, not only reduce mill significantly and select energy consumption, also reduced the number of devices of subsequent job, reduced equipment investment less than 50% of raw ore amount.
(4) compare with the existing processes flow process; Because it is whole ore-dressing technique is that magnetic reconnection closes mineral processing circuit, does not consume floating agent, very friendly to operating environment and surrounding enviroment; Protected environment, avoided flotation operation because adopt the beneficiation reagent pollution on the environment.
Description of drawings
Fig. 1 be the present invention adopt dry type magnetic separation, jigging gravity treatment get blast furnace lump ore, the lump ore mine tailing operation of dishing out counts the quality flow chart.
The chats regrinding and reconcentration that Fig. 2 adopts for the present invention " two stage grinding, weak magnetic, strong magnetic, centrifugal reselection operation " number quality flow chart.
The specific embodiment
For further describing the present invention, below in conjunction with accompanying drawing and embodiment the magnetic reconnection of a kind of bloodstone stone of the present invention is closed the ore-dressing technique technology and be described further.
The ore of handling 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 multielement analysis and iron material phase analysis, and the result sees table 1, table 2.
Analysis result shows that main valuable mineral is a hematite-limonite in the ore, is magnetic iron ore secondly, and ferric carbonate, ferrosilite and pyrite content are lower, and the iron of hematite-limonite accounts for 82.28%.The objectionable impurities sulfur content is 0.117%, and phosphorus content is lower, (CaO+MgO)/and (SiO 2+ Al 2O 3)=0.176 is acid drift.
Table 1 raw ore multielement analysis result (%)
Figure 243613DEST_PATH_IMAGE001
Table 2 raw ore iron material phase analysis result (%)
Iron grade 39.46%, granularity 40~10 ㎜ grade samples are carried out 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 the dry high-magnetic separation flow process throw useless after, the mine tailing of the productive rate 23.38%~26.77% of can dishing out, iron grade 10.43%~14.10%, iron concentrate grade can bring up to 50.47%~50.56%; Do not reach the iron concentrate grade of grade more than 54%, the mine tailing that it is qualified that dry high-magnetic separation can only be dished out is described and can not be obtained qualified blast furnace lump ore.
Iron grade 39.46%, granularity 40~10 ㎜ grade samples are carried out jigging gravity treatment test, and be the subsequent job production sample.Jigging test jig frequency is that 140 times/minute, stroke are 100mm, and experiment process is that a sorting test result sees table 3.
Table 3 jigging gravity treatment mill trial results (%)
Figure 139074DEST_PATH_IMAGE003
Result of the test shows, after the employing jigging sorts, can obtain the blast furnace lump ore of productive rate 32.29%, iron grade 54.25%, iron recovery 44.27%, and the blast furnace lump ore grade has satisfied the requirement of blast furnace lump ore to the iron grade; But the mine tailing iron grade after jigging sorts is higher, can not abandon as mine tailing, need reclaim.
From the result of the test of front, can know: dry high-magnetic separation can tailings discarding by preconcentration, the jigging gravity treatment 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, to reach not only tailings discarding by preconcentration but also purpose that in advance must concentrate.
To the dry high-magnetic separation concentrate that the dry high-magnetic separation preliminary election obtains, carry out jigging gravity treatment test, the jigging stroke is 100mm, and jig frequency is 140 times/minute, and result of the test is seen table 4.
Table 4 dry high-magnetic separation concentrate-jigging gravity treatment result of the test (%)
Result of the test shows, the dry high-magnetic separation concentrate is carried out jigging gravity treatment test, can obtain the iron grade and be 55.35% blast furnace lump ore, and the operation productive rate reaches 49.13%.
" dry type magnetic separation, jigging gravity treatment get blast furnace lump ore, the lump ore mine tailing operation of dishing out " of the final optimum organization that obtains is as shown in Figure 1; Final lump ore iron grade 55.35%, the productive rate 35.26% that obtains; And the lump ore mine tailing of the productive rate 21.61% of having dished out, iron grade 10.83%; Get into follow-up mill, be elected to be the industry the chats productive rate be merely 43.13%; Because goal ore grinding amount significantly reduces, and power consume accounts for 70% of whole ore dressing energy consumption, mineral processing circuit effects of energy saving and emission reduction therefore provided by the invention very significantly.
Chats regrinding and reconcentration " two stage grinding, weak magnetic, strong magnetic, centrifugal reselection operation " number quality flow chart by the present invention shown in Figure 2 adopts is found out; " chats " that Fig. 1 flow process is obtained feeds " two stage grinding, weak magnetic, strong magnetic, 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, strong magnetic, 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;
Secondary grinding, weak magnetic, strong magnetic, the low intensity magnetic separation magnetic field intensity 159.15kA/m of 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 rev/mins, and pulp density is 15%.
Research shows; Magnetic reconnection through a kind of bloodstone stone provided by the invention closes the ore-dressing technique technology; Can obtain the blast furnace lump ore of productive rate 35.26%, iron grade 55.35%, iron recovery 49.85% in advance, 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 is compared with direct mill choosing and improved 10.52 percentage points.
Blast furnace lump ore and gravity concentrate multielement analysis result that experimental study obtains see table 5 and table 6 respectively.
Table 5 blast furnace lump ore multielement analysis result (%)
Figure 496423DEST_PATH_IMAGE005
Table 6 gravity concentrate multielement analysis result (%)
Figure 934357DEST_PATH_IMAGE006

Claims (6)

1. the magnetic reconnection of a bloodstone stone closes the ore-dressing technique technology, it is characterized in that comprising following technology, step:
1) dry type magnetic separation, jigging gravity treatment get blast furnace lump ore, the lump ore mine tailing operation of dishing out: the bloodstone stone of iron grade >=38% feeds graded operation through crushing operation, be classified into 40 ~ 10mm ,-material of 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 the strong magnetic of dry type respectively 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 the jigging reselection operation after merging, and obtains blast furnace lump ore; The jigging gravity tailings is merged into chats with the material of-10mm grade;
2) primary grinding, weak magnetic, strong magnetic, centrifugal reselection operation: the chats that above-mentioned operation is obtained feeds the primary grinding operation; Pass through low intensity magnetic separation-strong magnetic again to roughly select-magnetic is scanned the operation processing by force; Dishing out one section to grind selects strong magnetic to scan mine tailing; Low intensity magnetic separation concentrate, strong magnetic feed the centrifugal reselection machine and carry out gravity treatment after roughly selecting concentrate, strong magnetic scavenger concentrate merging, obtain one section mill and select centrifugal reselection concentrate, one section centrifugal reselection chats;
3) secondary grinding, weak magnetic, strong magnetic, centrifugal reselection operation: one section centrifugal reselection chats that above-mentioned operation is obtained feeds the secondary grinding operation; Handle through low intensity magnetic separation, high intensity magnetic separation, centrifugal reselection operation again; The two sections mills of dishing out select high intensity magnetic separation mine tailing, two sections mills to select the centrifugal reselection mine tailing, obtain two sections mills and select the centrifugal reselection concentrate;
4) one section mill selects centrifugal reselection concentrate, two sections mills to get final gravity concentrate after selecting the centrifugal reselection concentrate to merge; One section mill selects strong magnetic to scan mine tailing, two sections mills and selects high intensity magnetic separation mine tailing, two sections mills to select the centrifugal reselection mine tailing to merge into mill to select mine tailing.
2. the magnetic reconnection of a kind of bloodstone stone as claimed in claim 1 closes the ore-dressing technique technology; It is characterized in that: the magnetic plant that the strong magnetic of said 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 said jigging gravity treatment is 60 ~ 120mm, and jig frequency is 80 ~ 160 times/minute.
3. the magnetic reconnection of a kind of bloodstone stone as claimed in claim 2 closes the ore-dressing technique technology, it is characterized in that: the stroke of said jigging gravity treatment is 90 ~ 110mm, and jig frequency is 130 ~ 150 times/minute.
4. the magnetic reconnection like claim 1,2 or 3 described a kind of bloodstone stones closes the ore-dressing technique technology, it is characterized in that: the mog of first section grinding operation with the mog of-0.076mm >=90%, the second section grinding operation with-0.045mm85%.
5. the magnetic reconnection of a kind of bloodstone stone as claimed in claim 4 closes the ore-dressing technique technology, it is characterized in that: the low intensity magnetic separation magnetic field intensity of primary grinding, weak magnetic, strong magnetic, 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; Secondary grinding, weak magnetic, strong magnetic, low intensity magnetic separation magnetic field intensity 140 ~ 170 kA/m of centrifugal reselection operation, magnetic field intensity 600 ~ 700 kA/m of high intensity magnetic separation.
6. the magnetic reconnection of a kind of bloodstone stone as claimed in claim 5 closes the ore-dressing technique technology, it is characterized in that: the centrifugal ore separator rotating speed of said centrifugal reselection operation is 400 ~ 500 rev/mins.
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CN103433137A (en) * 2013-07-29 2013-12-11 十堰源禹工贸有限公司 Breaking and separation integrated comprehensive recovery method of chrysotile tailings
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CN111437989A (en) * 2020-03-12 2020-07-24 中国地质科学院郑州矿产综合利用研究所 Method for recovering rutile in durite-hectorite product
CN113385299A (en) * 2021-05-28 2021-09-14 鞍钢集团矿业有限公司 Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore
CN113941441A (en) * 2021-10-14 2022-01-18 中钢集团马鞍山矿山研究总院股份有限公司 Wet-type strong magnetic preselection method for low-grade chromite
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