CN105618265B - Beneficiation method for ultralow-grade iron ore - Google Patents

Beneficiation method for ultralow-grade iron ore Download PDF

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Publication number
CN105618265B
CN105618265B CN201610052753.6A CN201610052753A CN105618265B CN 105618265 B CN105618265 B CN 105618265B CN 201610052753 A CN201610052753 A CN 201610052753A CN 105618265 B CN105618265 B CN 105618265B
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ore
separation
magnetic
beneficiation
concentrate
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CN201610052753.6A
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Chinese (zh)
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CN105618265A (en
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张红杰
母传伟
刘俊
李晓娟
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邯郸学院
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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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/30Combinations with other devices, not otherwise provided for

Abstract

The invention provides a beneficiation method for ultralow-grade iron ore. The beneficiation method comprises the following steps that dry separation ore is obtained after raw ore is subjected to three-stage crushing, two-stage dry separation and screening; the dry separation ore is subjected to two-stage closed circuit ore grinding, two-stage magnetic separation and concentration magnetic separation, and iron ore concentrate and tailings pulp are obtained; and the tailings pulp is subjected to one-stage closed circuit dehydration, tailings sand is obtained and mixed with blast furnace water quenching slag, crushed stone and cement, and then bricks are made. In the beneficiation method provided by the invention, before beneficiation, surrounding rock, waste rock and the like mixed in the raw ore are thrown away through three-stage crushing, two-stage dry separation and screening treatment to achieve more crushing and less grinding, the treatment quantity of ore grinding is decreased, and the ore grinding cost is lowered. In addition, the tailings sand is mixed with the blast furnace water quenching slag, the crushed stone and the cement, and then the bricks are made, so that recycle of tailings is achieved.

Description

The beneficiation method of super low-grade iron ore

Technical field

The present invention relates to technical field of beneficiation, in particular to a kind of beneficiation method of super low-grade iron ore.

Background technology

Super low-grade iron ore refers in the requirement (TFe less than production-grade specified in existing Mine Geological Investigation specification < 25%), but develop the general designation of the iron ore that there is profit under the conditions of existing economic technology.

Because the grade of super low-grade iron ore is low, during mining, can be mixed in raw ore a certain amount of country rock and Barren rock, not only increases mining cost, and also add the treating capacity of ore dressing, so that ore dressing difficulty is increased.

Produce substantial amounts of mine tailing in ore dressing process, these mine tailings are deposited in Tailings Dam for a long time, occupy substantial amounts of agricultural, Woods soil, thus lead to Tailings Dam location land resource unbalance.And, against the increase of mine tailing amount, this situation To be more severe.In addition to above-mentioned harm, easily flow during tailings impoundment and cave in, cause vegetation deterioration and casualty accident, especially It easily causes in rainy season and caves in and come down.With being continuously increased of mine tailing quantity, the height of mine tailing is consequently increased, dangerous Hidden danger increasingly increases.And the area in drought, wind big season, tailings easily fly upward aerial, cause environment dirty Dye.

In view of this, the special proposition present invention.

Content of the invention

It is an object of the invention to provide a kind of beneficiation method of super low-grade iron ore, the method is for super low-grade iron ore The problem that treating capacity present in ore dressing process is big, difficulty is big, pass through that three sections broken before ore dressing, two sections of dry separation, at screening Reason, jettisonings such as the country rock being mixed with raw ore, barren rocks, realizes much broken and lessmill, decreases the treating capacity of ore grinding, reduces ore grinding This.

In order to realize the above-mentioned purpose of the present invention, spy employs the following technical solutions:

The beneficiation method of super low-grade iron ore, comprises the steps:

(1) raw ore through three sections broken, two sections of dry separation, obtain dry separation ore after screening;

(2) described dry separation ore, through two sections of closed circuit grindings, two stages of magnetic separation enriching contracting magnetic separation, obtains iron ore concentrate and mine tailing ore deposit Slurry;

(3) described mine tailing ore pulp, through one section of closed circuit dehydration, obtains CHARACTERISTICS OF TAILINGS SAND, by described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, broken Brick is made after stone, cement mixing.

Super low-grade iron ore, in recovery process, is inevitably mixed into a certain amount of country rock, barren rock etc. in raw ore.This Invention in ore dressing process, by three sections broken, two sections of dry separation, the operation of screening, the country rock being mixed into, barren rock etc. before ore grinding Jettisoning, rejects part barren rock it is achieved that much broken and lessmill, reduces the treating capacity of ore grinding, reduce ore grinding cost.

Implement " early receipts can be received ", " this loses early losing " principle, the present invention adopts stage grinding staged magnetic separation in ore dressing process Flow process, reduces hypomere mill and is elected to be industry milling capacity, thus saving power consumption.

For a large amount of mine tailings producing in ore dressing process, the present invention obtains CHARACTERISTICS OF TAILINGS SAND after one section of closed circuit processed, Make brick by after CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, cement mixing, realize the recycling of mine tailing.

Preferably, in step (1), described three sections broken include coarse crushing, in broken and in small, broken bits, described two sections of dry separation include bulk Dry separation and particulate dry separation.

It is further preferred that described step (1) specifically includes:Raw ore successively through coarse crushing and in broken after carry out bulk dry separation, Obtain bulk dry separation ore;Described bulk dry separation ore is sieved, after oversize is in small, broken bits, is returned to bulk dry separation step again; Screenings carries out particulate dry separation, obtains dry separation ore.

By arranging three sections of broken and bulk dry separation and particulate dry separation, realize before ore grinding the country rock being mixed in raw ore, The purpose of the timely jettisoning such as barren rock.

In the present invention, described coarse crushing adopt hydraulic pressure vortex crushing machine, described in broken employing standard type hydraulic cone crush Machine or standard thick type hydro cone-crusher, described employing brachycephaly hydro cone-crusher in small, broken bits and the medium-sized multicylinder hydraulic of brachycephaly Gyratory crusher, described bulk dry separation adopts CTDG1216 permanent-magnet type dry type coarse magnetic separator, and described particulate dry separation adopts LCGJ- 1021 fine ore dry separator.

Preferably, described two sections of closed circuit grindings specifically include:

After dry separation ore carries out first paragraph ball milling, ore discharge is sieved, and oversize is returned to first paragraph ball milling step, structure again Become first paragraph closed circuit grinding;Screenings carries out first time magnetic separation, obtains first time magnetic concentrate, and described first time magnetic concentrate enters Row high frequency fine screen, oversize carries out concentrating magnetic separation for the first time, obtains concentrating magnetic concentrate for the first time, described first time concentrates magnetic separation Concentrate carries out second segment ball milling, and ore discharge is returned to high frequency fine screen step again, constitutes second segment closed circuit grinding;

After described high frequency fine screen, the screenings obtaining enters the second stages of magnetic separation and second segment concentrates.

In the beneficiation method that the present invention provides, adopt two sections of closed circuit grindings in ore grinding, by first paragraph closed circuit grinding and First time magnetic separation step, carries out whipping in advance, reduces the milling capacity of hypomere ore grinding and screening operation, thus save electric energy disappearing Consumption.In second segment closed circuit grinding, first it is classified using high frequency fine screen, is improved classification efficiency, increased mill output, reduced mill Ore deposit electric energy, then whipping in advance is carried out by first time concentration magnetic separation, reduce the treating capacity of second segment ore grinding.

In second segment grinding process, the screenings of high frequency fine screen carries out the second stages of magnetic separation and second segment concentrates magnetic separation, institute State the second stages of magnetic separation and second segment concentrates magnetic separation and specifically includes:

After described high frequency fine screen, the screenings obtaining carries out second magnetic separation, obtains second magnetic concentrate, and described second Secondary magnetic tailing enters second and concentrates magnetic separation, obtains second concentration magnetic concentrate, concentrates magnetic concentrate mistake described second Iron ore concentrate is obtained after filter.

Magnetic separation is concentrated by second magnetic separation and second, realizes the separation of iron ore concentrate and mine tailing.

In the present invention, described first time magnetic separation, first time concentrate magnetic separation, second magnetic separation and second and concentrate magnetic separation During also obtain mine tailing ore pulp.Described mine tailing ore pulp enters tailings glass system, realizes the recycling of mine tailing.

In the present invention, described first paragraph ore grinding adopts grate ball mill, and described second segment ore grinding adopts overflow type ball Grinding machine, described screening adopts linear vibrating screen, and described high frequency fine screen adopts HGZS-55-1207Z- high frequency vibrating fine screen, and described the Magnetic separation and second magnetic separation adopt CTB1230 permanent-magnet drum type magnetic separator, and described first time concentrates magnetic separation and concentrates for second Magnetic separation adopts NCT-1230 permanent-magnet drum type magnetic separator.

Preferably, in step (3), described mine tailing ore pulp specifically includes through one section of closed circuit dehydration, the step obtaining CHARACTERISTICS OF TAILINGS SAND:

Mine tailing ore pulp feeds cyclone and divides in pipe, and underflow entrance is dry to get rid of water sieve, and oversize is CHARACTERISTICS OF TAILINGS SAND, screenings Divide in pipe from flowing to cyclone, form one section of closed circuit dehydration.

Specifically, mine tailing ore pulp is delivered to cyclone in ore deposit pump pond by tailings pump (150KSH-EB), by cyclone to ore deposit Pump feeds cyclone and divides in pipe, and cyclone underflow density is 60%-75%, and underflow dry gets rid of water sieve (DW2440 type from flowing to Dewatering screen), the row's of doing oversize is CHARACTERISTICS OF TAILINGS SAND, conveys brickmaking by belt feeder, screenings from flowing into cyclone in ore deposit pump pond, shape Become closed circuit dehydration.

Cyclone overflow small part is from flowing to cyclone to the operation that carries out in ore deposit pump pond sizing mixing it is ensured that cyclone is most preferably to ore deposit Concentration, most of overflow is concentrated by chute and is collected, then enters in Tailings Dam by pipeline self, and doing ore dressing plant backwater after clarifying makes With.

Because the present invention is will to make brick after the process of mine tailing ore pulp, the mine tailing ore pulp that therefore present invention provides is in processing procedure In need not add substantial amounts of inorganic agent, such as flotation agent, collecting agent, pH adjusting agent etc., without treatment temperature to ore pulp etc. Parameter strictly controls, and processing procedure greatly simplifies.

And, the processing method of this pair of mine tailing ore pulp that the present invention provides is with low cost, and it is right that closed circuit dewatering system is realized The no waste mine of mine tailing ore pulp utilizes, economic and environment-friendly.

Preferably, in step (3), described make brick by after described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, cement mixing Step specifically includes:

Adobe is made through vibration die mould, described adobe warp after CHARACTERISTICS OF TAILINGS SAND, blast furnace water quenching slag, rubble and cement plus water are mixed Maintenance, obtains finished bricks.

In the method that the present invention provides, using CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble and cement production systD brick, CHARACTERISTICS OF TAILINGS SAND and Rubble ensures the intensity of brick, and blast furnace water quenching slag can adjust the water imbibition of brick, gas permeability, it is to avoid adobe produces in maintenance processes to be split Line, cement can improve the compression strength of brick, and various raw materials are bonded together.This method not only increases CHARACTERISTICS OF TAILINGS SAND Economic worth, and the brick made has the advantages that compression strength height, exterior quality are excellent.

In vibration pressing process, in order to ensure that adobe can be molded, by Stress control in 170-200MPa, die mould time Control in the 18-20 second.

In order to ensure intensity and the exterior quality of brick, the present invention is strict during brickmaking to control CHARACTERISTICS OF TAILINGS SAND, blast furnace water quenching The consumption of slag, rubble and cement is it is preferable that the quality of described CHARACTERISTICS OF TAILINGS SAND, described blast furnace water quenching slag, described rubble and described cement Than for (45-50):(35-40):(10-15):(10-13).

Based on same consideration it is preferable that the particle diameter of described rubble is 1mm-5mm, clay content<3%;Described cement is general Logical portland cement 425.

Compared with prior art, beneficial effects of the present invention are:

(1) present invention is directed to the feature of super low-grade iron ore, using three sections broken, two sections of dry separation, the operation of screening, grinding Jettisonings such as the country rock being mixed into, barren rocks before ore deposit, reject part barren rock it is achieved that much broken and lessmill, reduce the treating capacity of ore grinding, reduce Ore grinding cost.

(2) adopt two sections of closed circuit grindings in ore grinding, by first paragraph closed circuit grinding and first time magnetic separation step, carry out pre- First whipping, reduces the milling capacity of hypomere ore grinding and screening operation, thus saving power consumption.In second segment closed circuit grinding, First it is classified using high frequency fine screen, is improved classification efficiency, increased mill output, reduced ore grinding power consumption, then passed through first Secondary concentration magnetic separation carries out whipping in advance, reduces the treating capacity of second segment ore grinding.

(3) when processing to mine tailing, the invention provides a kind of to mine tailing twice laid, the method for synthetical recovery, Obtain CHARACTERISTICS OF TAILINGS SAND by mine tailing after one section of closed circuit processed, by described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble and Make brick after cement mixing, both solved the harm that tailings bulk deposition brings to environment, create economic worth again.

(4) present invention need not add substantial amounts of inorganic agent, such as flotation agent, collecting agent when mine tailing ore pulp is processed, and pH adjusts Section agent etc., strictly controls without parameters such as the treatment temperatures to ore pulp, processing procedure greatly simplifies.

(5) the brick compression strength adopting the method that the present invention provides prepared is high, exterior quality is excellent.

Brief description

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing having required use in technology description is briefly described.

Fig. 1 be embodiment 1 in ore dressing process, raw ore is through three sections broken, two sections of dry separation, obtain dry separation ore after screening Schematic flow sheet;

Fig. 2 be embodiment 1 in ore dressing process, dry separation ore through two sections of closed circuit grindings, two stages of magnetic separation, obtain iron ore concentrate and The schematic flow sheet of mine tailing ore pulp;

Fig. 3 for embodiment 1 in ore dressing process, illustrate through one section of closed circuit dehydration, the flow process obtaining CHARACTERISTICS OF TAILINGS SAND by mine tailing ore pulp Figure;

Fig. 4 be embodiment 1 in ore dressing process, the flow process of CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, cement, rubble manufacturing bricks by mixing is shown It is intended to.

Specific embodiment

Below in conjunction with embodiment, embodiment of the present invention is described in detail, but those skilled in the art will Understand, the following example is merely to illustrate the present invention, and be not construed as limiting the scope of the present invention.Unreceipted concrete in embodiment Condition person, the condition according to normal condition or manufacturer's suggestion is carried out.Agents useful for same or the unreceipted production firm person of instrument, are Can be by the commercially available conventional products bought and obtain.

Elaborate below by the beneficiation method that embodiment 1 provides to the present invention.

Embodiment 1

The first step:

As shown in figure 1, the raw ore from stope is transported to coarse crushing workshop through automobile, coarse crushing is fed raw ore by loading machine and sets Standby:PXZ1216 hydraulic rotary crusher, carries out coarse crushing, the broken equipment in being delivered to by belt feeder again of the raw ore after coarse crushing:TC84XH Standard type hydro cone-crusher, broken in carrying out.

In broken after raw ore be delivered in bulk dry separation equipment through belt feeder and carry out bulk dry separation.The barren rock of bulk dry separation enters Individually screening system, bulk dry separation ore is sieved through the 2YAH2460 circular shale shaker that belt feeder is delivered to screening dry separation workshop Point.

Oversize is transported to surge bunker in small, broken bits through belt feeder, and the ore of surge bunker in small, broken bits is delivered in small, broken bits respectively by belt feeder Equipment:TC84XH brachycephaly hydro cone-crusher and the medium-sized multicylinder hydraulic spindle breaker of PYH-D2515 brachycephaly, carry out thin Broken.Product after in small, broken bits is returned to the vibratory sieve in screening dry separation workshop again through belt feeder, constitutes closed circuit crushing.

After dry-dressing machine dry separation, dry separation barren rock is transported to barren rock place through belt feeder to undersize, and barren rock is screened to be gone out to close The building rubble of lattice.Dry separation ore is transported to belt feeder by belt feeder, by the dump car on belt feeder respectively to ore grinding storehouse Cloth.

Second step:

One section of closed circuit grinding:

In ore grinding storehouse, ore is fed through funnel under ore storage bin, then feeds first paragraph ball mill respectively through belt feeder:φ3600× 4500 grate ball mills.First paragraph ball mill ore discharging feeds ZKK3061 linear vibrating screen.

Straight line shaker oversize is returned to first paragraph ball mill by bucket type belt feeder, constitutes first paragraph closed circuit grinding system System.

Straight line shaker undersize flow to first time magnetic plant certainly:CTB1230 permanent-magnet drum type magnetic separator, obtains first time magnetic The mine tailing ore pulp of concentrate selection and first time magnetic separation.First time magnetic concentrate is raised by pump and is delivered to high frequency fine screen, the tail of first time magnetic separation Ore deposit pulp gravity flow to total mine tailing chute, raised by pump and deliver to tailing pit, enters lower step tailings glass system by the mine tailing of total mine tailing chute.

Second segment closed circuit grinding:

High frequency fine screen oversize flow to concentration magnetic plant certainly:NCT-1230 permanent-magnet drum type magnetic separator, is carried out for the first time Concentrate magnetic separation, obtain the mine tailing ore pulp concentrating magnetic concentrate for the first time and concentrating magnetic separation for the first time.Wherein, concentrate magnetic separation for the first time Concentrate flow to second segment ball mill certainly:φ 3600 × 8500 overflowball mill, second segment ball mill ore discharging is raised by pump and is delivered to High frequency fine screen, constitutes second segment closed circuit grinding system;Concentrate the mine tailing pulp gravity flow of magnetic separation for the first time to total mine tailing chute, total tail The mine tailing of ore deposit chute is raised by pump and is delivered to tailing pit, enters lower step tailings glass system.

Second stages of magnetic separation and second segment concentrate magnetic separation:

High frequency fine screen undersize flow to second magnetic plant certainly:CTB1230 permanent-magnet drum type magnetic separator, obtains second The mine tailing ore pulp of magnetic concentrate and second magnetic separation.Wherein, second magnetic concentrate flow to concentration magnetic plant certainly:NCT-1230 Permanent-magnet drum type magnetic separator carries out second concentration magnetic separation, the mine tailing obtaining second concentration magnetic concentrate and concentrating magnetic separation for second Ore pulp.Second concentration magnetic concentrate is raised by pump and is delivered to filter distributor box, more the allocated case flow to (72m certainly2) disc type vacuum Filter filters.Filter cake (i.e. iron ore concentrate) is delivered to concentrate place by belt feeder.The mine tailing ore pulp of second magnetic separation and The mine tailing ore pulp that second concentrates magnetic separation all flows automatically to total mine tailing chute, and the mine tailing of total mine tailing chute is raised by pump and delivered to tailing pit, Enter lower step tailings glass system.Refer to Fig. 2.

The closed circuit dehydration of mine tailing:

As shown in figure 3, the closed circuit dehydration of mine tailing comprises the steps:

Mine tailing is delivered to cyclone in ore deposit pump pond by tailings pump (150KSH-EB), by cyclone (φ 350x4 cyclone Group) feed cyclone to ore deposit pump and divide in pipe, cyclone underflow density is 70% about, and underflow dry gets rid of water sieve from flowing to (DW2440 type dewatering screen), the row's of doing oversize is thick CHARACTERISTICS OF TAILINGS SAND, conveys brickmaking by belt feeder, and screenings is given from flowing into cyclone In ore deposit pump pond, form closed cycle.Cyclone overflow small part from flow to cyclone to carry out in ore deposit pump pond sizing mixing operation it is ensured that The optimal feed ore concentration of cyclone, most of overflow is concentrated by chute and is collected, then is entered in Tailings Dam by pipeline self, does after clarifying Ore dressing plant backwater uses.

3rd step:

CHARACTERISTICS OF TAILINGS SAND, ordinary cement, rubble, blast furnace water quenching slag are respectively charged in raw material silo, by belt feeder feeding.Press According to CHARACTERISTICS OF TAILINGS SAND:Blast furnace water quenching slag:Rubble:Cement=45:35:10:10 mass ratio carries out batch mixing, is delivered in mixer, plus Water is stirred.After stirring evenly, Vibrocompacting device feeding mouth is poured into by mixer, vibrate die mould base, Stress control exists 170MPa, 18 seconds die mould time.

Adobe is delivered in curing kilns, by adobe piling, curing cycle is 28 days.During maintenance, every 2 days to brick Hack spray watering.After 28 days, get product brick.

Embodiment 2

The present embodiment is carried out on the basis of embodiment 1, is a difference in that in the third step,

In the present embodiment, CHARACTERISTICS OF TAILINGS SAND used, blast furnace water quenching slag, rubble, the mass ratio of cement are 50:40:15:13, used Rubble particle diameter be 1mm-5mm, clay content<3%, cement used is Portland cement 425.

The raw ore that collects of Zunhua City prosperity mining area is pointed to using the beneficiation method that embodiment 1 provides and carries out ore dressing, institute State the Iron grade of raw ore for TFe be 18%, mFe be 8%.

The Iron grade of the iron ore concentrate obtaining after ore dressing is 66%, and full iron recovery is 46.77%.Tailing dry arranges major product Technical indicator as shown in table 1.

Table 1

Yield (%) Concentration (%) Total mine tailing 100 19.0 charACTERISTICS OF TAILINGS SAND 81.3 85.0 Wet mine tailing 18.7 4.63

The compression strength and exterior quality of the brick that embodiment 1 and embodiment 2 are obtained is detected, its testing result such as table Shown in 2.

Table 2 testing result

Compression strength Exterior quality Embodiment 1 ≥17.0MPa No slabbing Embodiment 2 ≥18.0MPa No slabbing

Although illustrate and describing the present invention with specific embodiment, but it will be appreciated that without departing substantially from the present invention's Many other changes can be made in the case of spirit and scope and change.It is, therefore, intended that in the following claims Including all such changes and modifications belonging in the scope of the invention.

Claims (9)

1. surpass the beneficiation method of low-grade iron ore it is characterised in that comprising the steps:
(1) raw ore through three sections broken, two sections of dry separation, obtain dry separation ore after screening;
(2) described dry separation ore, through two sections of closed circuit grindings, two stages of magnetic separation enriching contracting magnetic separation, obtains iron ore concentrate and mine tailing ore pulp;
(3) described mine tailing ore pulp, through one section of closed circuit dehydration, obtains CHARACTERISTICS OF TAILINGS SAND, by described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, water Brick is made after mud mixing;
Wherein, described two sections of closed circuit grindings specifically include:
After dry separation ore carries out first paragraph ball milling, ore discharge is sieved, and oversize is returned to first paragraph ball milling step again, constitutes the One section of closed circuit grinding;Screenings carries out first time magnetic separation, obtains first time magnetic concentrate, and described first time magnetic concentrate carries out height Frequency dusting cover, oversize carries out concentrating magnetic separation for the first time, obtains concentrating magnetic concentrate for the first time, described first time concentrates magnetic concentrate Carry out second segment ball milling, ore discharge is returned to high frequency fine screen step again, constitute second segment closed circuit grinding;
After described high frequency fine screen, the screenings obtaining enters the second stages of magnetic separation and second segment concentrates magnetic separation.
2. beneficiation method according to claim 1 is it is characterised in that in step (1), described three sections broken include coarse crushing, In broken and in small, broken bits, described two sections of dry separation include bulk dry separation and particulate dry separation.
3. beneficiation method according to claim 2 is it is characterised in that described step (1) specifically includes:Raw ore is successively through thick Broken and in broken after carry out bulk dry separation, obtain bulk dry separation ore;Described bulk dry separation ore is sieved, oversize is in small, broken bits It is returned to bulk dry separation step afterwards again;Screenings carries out particulate dry separation, obtains dry separation ore.
4. beneficiation method according to claim 1 is it is characterised in that described second stages of magnetic separation and second segment concentrate magnetic separation tool Body includes:
After described high frequency fine screen, the screenings obtaining carries out second magnetic separation, obtains second magnetic concentrate, described second magnetic Concentrate selection enters second and concentrates magnetic separation, obtains second concentration magnetic concentrate, after described second concentration magnetic concentrate filters Obtain iron ore concentrate.
5. beneficiation method according to claim 4 is it is characterised in that described first time magnetic separation, described first time concentrate magnetic Mine tailing ore pulp is also obtained in the step of choosing, described second magnetic separation and described second concentration magnetic separation.
6. beneficiation method according to claim 1 is it is characterised in that in step (3), described mine tailing ore pulp is closed circuit through one section Dehydration, the step obtaining CHARACTERISTICS OF TAILINGS SAND specifically includes:
Mine tailing ore pulp feeds cyclone and divides in pipe and is classified, underflow enter dry gets rid of water sieve, oversize is CHARACTERISTICS OF TAILINGS SAND, sieve Lower thing certainly flow to cyclone and divides in pipe, forms one section of closed circuit dehydration.
7. the beneficiation method according to any one of claim 1-6 is it is characterised in that in step (3), described by described mine tailing The step making brick after sand and blast furnace water quenching slag, rubble, cement mixing specifically includes:
Adobe is made through vibration die mould, described adobe is through supporting after CHARACTERISTICS OF TAILINGS SAND, blast furnace water quenching slag, rubble and cement plus water are mixed Shield, obtains finished bricks.
8. beneficiation method according to claim 7 is it is characterised in that described CHARACTERISTICS OF TAILINGS SAND, described blast furnace water quenching slag, described broken The mass ratio of stone and described cement is (45-50):(35-40):(10-15):(10-13).
9. beneficiation method according to claim 7 it is characterised in that described rubble particle diameter be 1mm-5mm, clay content< 3%;Described cement is Portland cement 425.
CN201610052753.6A 2016-01-27 2016-01-27 Beneficiation method for ultralow-grade iron ore CN105618265B (en)

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CN106111297B (en) * 2016-08-15 2019-04-09 马钢集团设计研究院有限责任公司 A kind of ore-dressing technique and its production system of chromium depleted zone
CN107051695A (en) * 2017-05-08 2017-08-18 玉溪大红山矿业有限公司 A kind of efficient ore reduction technique and its crushing system
CN107413517B (en) * 2017-07-27 2019-05-31 中钢集团马鞍山矿山研究院有限公司 A kind of beneficiation method improving micro fine particle magnetite stone stage grinding and stage separation sorting index
CN107469996A (en) * 2017-08-30 2017-12-15 玉溪大红山矿业有限公司 A kind of low-grade lava magnetic iron ore dry type tailings discarding by preconcentration method
CN108339661A (en) * 2018-02-09 2018-07-31 鞍钢集团矿业设计研究院有限公司 The full permanent magnetism short route of stage grinding handles mixed type iron ore technique
CN109277193A (en) * 2018-10-09 2019-01-29 乔盘池 A kind of efficient magnetic separation process of mineral

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CN101559403B (en) * 2009-05-31 2013-03-20 安徽大昌矿业集团有限公司 Method for concentrating extremely low-grade refractory magnetite
CN102220477A (en) * 2010-04-13 2011-10-19 陕西汇金矿业科技发展有限公司 Development and utilization technology of low-grade iron ore
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