CN105618265A - Beneficiation method for ultralow-grade iron ore - Google Patents
Beneficiation method for ultralow-grade iron ore Download PDFInfo
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- CN105618265A CN105618265A CN201610052753.6A CN201610052753A CN105618265A CN 105618265 A CN105618265 A CN 105618265A CN 201610052753 A CN201610052753 A CN 201610052753A CN 105618265 A CN105618265 A CN 105618265A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations 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
Technical field
The present invention relates to technical field of beneficiation, in particular to the beneficiation method of a kind of super low-grade iron ore.
Background technology
Super low-grade iron ore refers to the requirement (TFe < 25%) of the production-grade of regulation in lower than existing Mine Geological Investigation specification, but develops the general designation of the iron ore that there is profit when existing economic technology.
Owing to the grade of super low-grade iron ore is low, in the process of mining, raw ore can be mixed into a certain amount of country rock and barren rock, not only increase mining cost, but also add the treating capacity of ore dressing, also make ore dressing difficulty increase.
Producing 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 causing that the land resource of Tailings Dam location is unbalance. And, facing to the increase of mine tailing amount, this situation will be more severe. Except above-mentioned harm, easily flow during tailings impoundment and cave in, causing vegetation deterioration and casualty accident, especially very easily causing in rainy season and cave in and come down. Along with being continuously increased of mine tailing quantity, the height of mine tailing is consequently increased, and hidden danger increases day by day. And in the area of drought, in the season that wind is big, tailings easily flies upward in the air, cause environmental pollution.
In view of this, the special proposition present invention.
Summary of the invention
It is an object of the invention to provide the beneficiation method of a kind of super low-grade iron ore, the problem that the treating capacity that the method exists in ore dressing process for super low-grade iron ore is big, difficulty is big, by three sections of broken, two sections of dry separation, screenings process before ore dressing, jettisonings such as the country rock being mixed with in raw ore, barren rocks, realize much broken and lessmill, decrease the treating capacity of ore grinding, reduce ore grinding cost.
In order to realize the above-mentioned purpose of the present invention, spy by the following technical solutions:
The beneficiation method of super low-grade iron ore, comprises the steps:
(1) raw ore obtains dry separation Ore through three sections broken, after two sections of dry separation, screenings;
(2) described dry separation Ore adds concentration magnetic separation through two sections of closed circuit grindings, two stages of magnetic separation, obtains iron ore concentrate and mine tailing ore pulp;
(3) described mine tailing ore pulp is through one section of closed circuit dehydration, obtains CHARACTERISTICS OF TAILINGS SAND, makes brick after described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, 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. The present invention in ore dressing process, by three sections broken, two sections of dry separation, screening operation, jettisonings such as the country rock being mixed into, barren rocks before ore grinding, reject part barren rock, it is achieved that much broken and lessmill, reduce the treating capacity of ore grinding, reduce ore grinding cost.
Implementing " can receive and early receive ", " this is lost and early loses " principle, the present invention adopts stage grinding staged magnetic separation flow process in ore dressing process, reduces hypomere mill and is elected to be industry milling capacity, thus saving power consumption.
For a large amount of mine tailings produced in ore dressing process, the present invention obtains CHARACTERISTICS OF TAILINGS SAND by after one section of closed circuit processed, makes brick, it is achieved the recycling of mine tailing after CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, cement mixing.
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; Siftage carries out particulate dry separation, obtains dry separation Ore.
By arranging three sections of broken and bulk dry separation and particulate dry separation, it is achieved the purpose of the jettisoning in time such as the country rock being mixed in raw ore, barren rock before ore grinding.
In the present invention, described coarse crushing adopts hydraulic pressure vortex crushing machine, broken employing standard type hydro cone-crusher or the thick type hydro cone-crusher of standard in described, described employing brachycephaly hydro cone-crusher in small, broken bits and the medium-sized multicylinder hydraulic spindle breaker of brachycephaly, 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 sieves, and oversize is returned to first paragraph ball milling step again, constitutes first paragraph closed circuit grinding; Siftage carries out first time magnetic separation, obtain first time magnetic concentrate, described first time magnetic concentrate carries out high frequency fine screen, oversize carries out concentrating magnetic separation for the first time, obtain concentrating magnetic concentrate for the first time, concentration of described first time magnetic 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 siftage obtained enters second segment magnetic separation and second segment concentration.
In beneficiation method provided by the invention, adopting two sections of closed circuit grindings when ore grinding, by first paragraph closed circuit grinding and first time magnetic separation step, carry out whipping in advance, reducing hypomere ore grinding and the milling capacity of screening operation, thus saving power consumption. When second segment closed circuit grinding, first adopt high frequency fine screen to carry out classification, improve classification efficiency, increase mill output, reduce ore grinding electric energy, carry out whipping in advance again through first time concentration magnetic separation, reduce the treating capacity of second segment ore grinding.
In second segment grinding process, the siftage of high frequency fine screen carries out second segment magnetic separation and second segment concentration magnetic separation, described second segment magnetic separation and second segment concentration magnetic separation and specifically includes:
After described high frequency fine screen, the siftage obtained carries out second time magnetic separation, obtains second time magnetic concentrate, and described second time magnetic tailing enters second time and concentrates magnetic separation, obtaining second time and concentrate magnetic concentrate, described second time concentration magnetic concentrate obtains iron ore concentrate after filtering.
Magnetic separation is concentrated, it is achieved the separation of iron ore concentrate and mine tailing by second time magnetic separation and second time.
In the present invention, described first time magnetic separation, first time concentrate magnetic separation, second time magnetic separation and second time concentrate magnetic separation process in also obtain mine tailing ore pulp. Described mine tailing ore pulp enters tailings glass system, it is achieved the recycling of mine tailing.
In the present invention, described first paragraph ore grinding adopts grate ball mill, described second segment ore grinding adopts overflowball mill, described screening adopts linear vibrating screen, described high frequency fine screen adopts HGZS-55-1207Z-high frequency vibrating fine screen, described first time magnetic separation and second time magnetic separation adopt CTB1230 permanent-magnet drum type magnetic separator, and the concentration magnetic separation of described first time and second time concentration magnetic separation adopt NCT-1230 permanent-magnet drum type magnetic separator.
Preferably, in step (3), described mine tailing ore pulp is through one section of closed circuit dehydration, and the step obtaining CHARACTERISTICS OF TAILINGS SAND specifically includes:
Mine tailing ore pulp feeds cyclone and divides in pipe, and underflow enters dry water sieve of getting rid of, and oversize is CHARACTERISTICS OF TAILINGS SAND, and siftage certainly flow to cyclone and divides in pipe, forms one section of closed circuit dehydration.
Specifically, mine tailing ore pulp is delivered to cyclone in pump pond, ore deposit by tailings pump (150KSH-EB), fed cyclone by cyclone to ore deposit pump and divide in pipe, cyclone underflow density is 60%-75%, underflow dry gets rid of water sieve (DW2440 type dewatering screen) from flowing to, and dry row's oversize is CHARACTERISTICS OF TAILINGS SAND, belt feeder carry brickmaking, siftage, from flowing into cyclone in pump pond, ore deposit, forms closed circuit dehydration.
Cyclone overflow small part is from flowing to cyclone to the operation that carries out sizing mixing in pump pond, ore deposit, it is ensured that cyclone the best feed ore concentration, and major part overflow is concentrated by chute and collected, then is entered in Tailings Dam by pipeline self, does ore dressing plant backwater and use after clarifying.
Owing to the present invention makes brick after the process of mine tailing ore pulp, therefore mine tailing ore pulp provided by the invention in processing procedure without adding substantial amounts of inorganic agent, for instance flotation agent, collecting agent, pH adjusting agent etc., strictly controlling without parameters such as the treatment temperatures to ore pulp, processing procedure is greatly simplified.
And, the processing method of this pair mine tailing ore pulp provided by the invention is with low cost, and closed circuit dewatering system realizes the no waste mine of mine tailing ore pulp is utilized, economic and environment-friendly.
Preferably, in step (3), described the step making brick after described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, cement mixing is specifically included:
Making adobe through vibration die mould after CHARACTERISTICS OF TAILINGS SAND, blast furnace water quenching slag, rubble and cement plus water being mixed, described adobe, through maintenance, obtains finished bricks.
In method provided by the invention, utilize CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble and cement production systD brick, CHARACTERISTICS OF TAILINGS SAND and rubble ensure the intensity of brick, the water absorption of blast furnace water quenching slag scalable brick, breathability, adobe is avoided to crack in maintenance processes, cement can improve the comprcssive strength of brick, is bonded together by various raw materials again. This method not only increases the economic worth of CHARACTERISTICS OF TAILINGS SAND, and the brick made has the advantage that comprcssive strength height, exterior quality are excellent.
Vibration pressing process in, in order to ensure adobe can molding, by Stress control at 170-200MPa, the die mould time controlled in the 18-20 second.
In order to ensure intensity and the exterior quality of brick, the present invention strictly controls the consumption of CHARACTERISTICS OF TAILINGS SAND, blast furnace water quenching slag, rubble and cement in brickmaking process, preferably, the mass ratio of described CHARACTERISTICS OF TAILINGS SAND, described blast furnace water quenching slag, described rubble and described cement is (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 Portland cement 425.
Compared with prior art, the invention have the benefit that
(1) the present invention is directed to the feature of super low-grade iron ore, adopt that three sections broken, two sections of dry separation, screening operation, jettisonings such as the country rock being mixed into, barren rocks before ore grinding, reject part barren rock, achieve much broken and lessmill, reduce the treating capacity of ore grinding, reduce ore grinding cost.
(2) adopting two sections of closed circuit grindings when ore grinding, by first paragraph closed circuit grinding and first time magnetic separation step, carry out whipping in advance, reducing hypomere ore grinding and the milling capacity of screening operation, thus saving power consumption. When second segment closed circuit grinding, first adopt high frequency fine screen to carry out classification, improve classification efficiency, increase mill output, reduce ore grinding power consumption, carry out whipping in advance again through first time concentration magnetic separation, reduce the treating capacity of second segment ore grinding.
(3) when mine tailing is processed, the invention provides a kind of to mine tailing twice laid, the method of synthetical recovery, namely pass through mine tailing after one section of closed circuit processed, obtain CHARACTERISTICS OF TAILINGS SAND, after described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble and cement mixing, make brick, both solved the harm that environment is brought by tailings bulk deposition, created again economic worth.
(4) without adding substantial amounts of inorganic agent when mine tailing ore pulp is processed by the present invention, for instance flotation agent, collecting agent, pH adjusting agent etc., strictly control without parameters such as the treatment temperatures to ore pulp, processing procedure is greatly simplified.
(5) the brick comprcssive strength adopting method provided by the invention prepared is high, exterior quality is excellent.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below.
Fig. 1 be embodiment 1 in ore dressing process, raw ore obtains the schematic flow sheet of dry separation Ore through three sections broken, after two sections of dry separation, screenings;
Fig. 2 be embodiment 1 in ore dressing process, dry separation Ore, through two sections of closed circuit grindings, two stages of magnetic separation, obtains iron ore concentrate and the schematic flow sheet of mine tailing ore pulp;
Fig. 3 be embodiment 1 in ore dressing process, mine tailing ore pulp, through one section of closed circuit dehydration, obtains the schematic flow sheet of CHARACTERISTICS OF TAILINGS SAND;
Fig. 4 be embodiment 1 in ore dressing process, CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, cement, rubble manufacturing bricks by mixing schematic flow sheet.
Detailed description of the invention
Below in conjunction with embodiment, embodiment of the present invention are described in detail, it will be appreciated by those skilled in the art that the following example is merely to illustrate the present invention, and are not construed as restriction the scope of the present invention. Unreceipted actual conditions person in embodiment, conventionally the condition of condition or manufacturer's suggestion carries out. Agents useful for same or the unreceipted production firm person of instrument, be and can pass through the commercially available conventional products bought and obtain.
1 pair of beneficiation method provided by the invention elaborates by the examples below.
Embodiment 1
The first step:
As shown in Figure 1, raw ore from stope is transported to coarse crushing workshop through automobile, by loader, raw ore is fed coarse smash equipment: PXZ1216 hydraulic rotary crusher, carries out coarse crushing, raw ore after coarse crushing is broken equipment in being delivered to by belt feeder again: 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 independent screening system, and the 2YAH2460 circular shale shaker that bulk dry separation Ore is delivered to screening dry separation workshop through belt feeder sieves.
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 to fine crushing device by belt feeder respectively: TC84XH brachycephaly hydro cone-crusher and the medium-sized multicylinder hydraulic spindle breaker of PYH-D2515 brachycephaly, carries out in small, broken bits. Product after in small, broken bits is returned to the vibrosieve in screening dry separation workshop then through belt feeder, constitutes closed circuit crushing.
Undersize is after dry-dressing machine dry separation, and dry separation barren rock is transported to barren rock place through belt feeder, barren rock screened go out qualified building rubble. 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:
Ore funnel feed under ore storage bin in ore grinding storehouse, feeds first paragraph ball mill: �� 3600 �� 4500 grate ball mill respectively then through belt feeder. 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.
Straight line shaker undersize is from flowing to first time magnetic plant: CTB1230 permanent-magnet drum type magnetic separator, obtains the mine tailing ore pulp of first time magnetic concentrate and first time magnetic separation. First time magnetic concentrate is raised by pump and is delivered to high frequency fine screen, and the mine tailing pulp gravity flow of first time magnetic separation is to total mine tailing chute, and the mine tailing of total mine tailing chute is raised by pump and delivered to tailing pit, enters lower step tailings glass system.
Second segment closed circuit grinding:
High frequency fine screen oversize is from flowing to concentration magnetic plant: NCT-1230 permanent-magnet drum type magnetic separator, carries out concentrating magnetic separation for the first time, obtains first time concentration magnetic concentrate and the mine tailing ore pulp of first time concentration magnetic separation. Wherein, first time concentration magnetic concentrate is from flowing to second segment ball mill: �� 3600 �� 8500 overflowball mill, and second segment ball mill ore discharging is raised by pump and delivered to high frequency fine screen, constitutes second segment closed circuit grinding system; First time concentrates the mine tailing pulp gravity flow of magnetic separation to total mine tailing chute, and the mine tailing of total mine tailing chute is raised by pump and delivered to tailing pit, enters lower step tailings glass system.
Second segment magnetic separation and second segment concentration magnetic separation:
High frequency fine screen undersize is from flowing to second time magnetic plant: CTB1230 permanent-magnet drum type magnetic separator, obtains second time magnetic concentrate and the mine tailing ore pulp of second time magnetic separation. Wherein, second time magnetic concentrate is from flowing to concentration magnetic plant: NCT-1230 permanent-magnet drum type magnetic separator carries out second time and concentrates magnetic separation, obtains concentration magnetic concentrate and second time for the second time and concentrates the mine tailing ore pulp of magnetic separation. Second time concentration magnetic concentrate is raised by pump and is delivered to filter distributor box, then through distributor box from flowing to (72m2) disk vacuum filter filtration. Filter cake (i.e. iron ore concentrate) is delivered to concentrate place by belt feeder. The mine tailing ore pulp of second time magnetic separation and second time concentrate the mine tailing ore pulp of magnetic separation and all flow 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 it is shown on figure 3, the closed circuit dehydration of mine tailing comprises the steps:
Mine tailing is delivered to cyclone in pump pond, ore deposit by tailings pump (150KSH-EB), fed cyclone by cyclone (�� 350x4 a cluster cyclone) to ore deposit pump and divide in pipe, cyclone underflow density is about 70%, underflow dry gets rid of water sieve (DW2440 type dewatering screen) from flowing to, dry row's oversize is thick CHARACTERISTICS OF TAILINGS SAND, being carried brickmaking by belt feeder, siftage is from flowing into cyclone to, in pump pond, ore deposit, forming closed cycle. Cyclone overflow small part is from flowing to cyclone to the operation that carries out sizing mixing in pump pond, ore deposit, it is ensured that cyclone the best feed ore concentration, and major part overflow is concentrated by chute and collected, then is entered in Tailings Dam by pipeline self, does ore dressing plant backwater and use after clarifying.
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. According to CHARACTERISTICS OF TAILINGS SAND: blast furnace water quenching slag: rubble: the mass ratio of cement=45:35:10:10 carries out batch mixing, it is delivered in blender, adds water and be stirred. After stirring evenly, blender pour into Vibrocompacting device feeding mouth, vibrate die mould base, Stress control at 170MPa, 18 seconds die mould time.
Being delivered in curing kilns by adobe, by adobe piling, curing cycle is 28 days. During maintenance, every 2 days to adobe buttress spray watering. After 28 days, get product brick.
Embodiment 2
The present embodiment carries out on the basis of embodiment 1, is a difference in that in the third step,
CHARACTERISTICS OF TAILINGS SAND used in the present embodiment, blast furnace water quenching slag, rubble, cement mass ratio be 50:40:15:13, the particle diameter of rubble used is 1mm-5mm, and < 3%, cement used is Portland cement 425 to clay content.
Adopting the beneficiation method that embodiment 1 provides to be pointed to the raw ore that prosperity mining area, Zunhua City collects and carry out ore dressing, the Iron grade of described raw ore is TFe is 18%, and mFe is 8%.
The Iron grade of the iron ore concentrate obtained after ore dressing is 66%, and full iron recovery is 46.77%. The technical specification of tailing dry row's major product is as shown in table 1.
Table 1
| Productivity (%) | Concentration (%) | |
| Total mine tailing | 100 | 19.0 |
| charACTERISTICS OF TAILINGS SAND | 81.3 | 85.0 |
| Wet mine tailing | 18.7 | 4.63 |
Comprcssive strength and exterior quality to the brick that embodiment 1 and embodiment 2 prepare detect, and its testing result is as shown in table 2.
Table 2 testing result
| Comprcssive strength | Exterior quality | |
| Embodiment 1 | ��17.0MPa | Without slabbing |
| Embodiment 2 | ��18.0MPa | Without slabbing |
Although illustrate and describing the present invention with specific embodiment, however it will be appreciated that may be made that when without departing substantially from the spirit and scope of the present invention many other change and amendment. It is, therefore, intended that include all such changes and modifications belonging in the scope of the invention in the following claims.
Claims (10)
1. surpass the beneficiation method of low-grade iron ore, it is characterised in that comprise the steps:
(1) raw ore obtains dry separation Ore through three sections broken, after two sections of dry separation, screenings;
(2) described dry separation Ore adds concentration magnetic separation through two sections of closed circuit grindings, two stages of magnetic separation, obtains iron ore concentrate and mine tailing ore pulp;
(3) described mine tailing ore pulp is through one section of closed circuit dehydration, obtains CHARACTERISTICS OF TAILINGS SAND, makes brick after described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, cement mixing.
2. beneficiation method according to claim 1, 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, it is characterised in 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; Siftage carries out particulate dry separation, obtains dry separation Ore.
4. beneficiation method according to claim 1, it is characterised in that described two sections of closed circuit grindings specifically include:
After dry separation Ore carries out first paragraph ball milling, ore discharge sieves, and oversize is returned to first paragraph ball milling step again, constitutes first paragraph closed circuit grinding; Siftage carries out first time magnetic separation, obtain first time magnetic concentrate, described first time magnetic concentrate carries out high frequency fine screen, oversize carries out concentrating magnetic separation for the first time, obtain concentrating magnetic concentrate for the first time, concentration of described first time magnetic 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 siftage obtained enters second segment magnetic separation and second segment concentration magnetic separation.
5. beneficiation method according to claim 4, it is characterised in that described second segment magnetic separation and second segment concentration magnetic separation specifically include:
After described high frequency fine screen, the siftage obtained carries out second time magnetic separation, obtains second time magnetic concentrate, and described second time magnetic concentrate enters second time and concentrates magnetic separation, obtaining second time and concentrate magnetic concentrate, described second time concentration magnetic concentrate obtains iron ore concentrate after filtering.
6. beneficiation method according to claim 5, it is characterised in that also obtain mine tailing ore pulp in the step of described first time magnetic separation, the concentration magnetic separation of described first time, described second time magnetic separation and the concentration magnetic separation of described second time.
7. beneficiation method according to claim 1, it is characterised in that in step (3), described mine tailing ore pulp is through one section of closed circuit dehydration, and the step obtaining CHARACTERISTICS OF TAILINGS SAND specifically includes:
Mine tailing ore pulp feeds cyclone and divides and carry out classification in pipe, and underflow enters dry water sieve of getting rid of, and oversize is CHARACTERISTICS OF TAILINGS SAND, and siftage divides in pipe from flowing to cyclone, forms one section of closed circuit dehydration.
8. the beneficiation method according to any one of claim 1-7, it is characterised in that in step (3), described specifically includes the step making brick after described CHARACTERISTICS OF TAILINGS SAND and blast furnace water quenching slag, rubble, cement mixing:
Making adobe through vibration die mould after CHARACTERISTICS OF TAILINGS SAND, blast furnace water quenching slag, rubble and cement plus water being mixed, described adobe, through maintenance, obtains finished bricks.
9. beneficiation method according to claim 8, it is characterized in that, the mass ratio of described CHARACTERISTICS OF TAILINGS SAND, described blast furnace water quenching slag, described rubble and described cement is (45-50): (35-40): (10-15): (10-13).
10. beneficiation method according to claim 8, it is characterised in that the particle diameter of described rubble is 1mm-5mm, clay content < 3%; Described cement is Portland cement 425.
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| 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 |
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| CN113333160A (en) * | 2021-06-18 | 2021-09-03 | 太原钢铁(集团)有限公司 | Immersion type large-area multi-sucker fishing device and method for waste residues |
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