CN105195427A - Iron ore dry separation technology based on concentrated-phase gas-solid fluidized bed - Google Patents
Iron ore dry separation technology based on concentrated-phase gas-solid fluidized bed Download PDFInfo
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- CN105195427A CN105195427A CN201510703985.9A CN201510703985A CN105195427A CN 105195427 A CN105195427 A CN 105195427A CN 201510703985 A CN201510703985 A CN 201510703985A CN 105195427 A CN105195427 A CN 105195427A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
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Abstract
The invention discloses an iron ore dry separation technology based on a concentrated-phase gas-solid fluidized bed, and belongs to an iron ore dry separation technology. The technology comprises the steps that iron ore is crushed, screening is performed with a two-layer screen, and materials with the particle size of 6-100 mm are processed with a gas-solid dense medium fluidized bed separator to obtain floating substances and sunk substances; materials with the particle size of 1-6 mm are separated with a vibrated fluidized bed, closed circuit grinding is performed on roughing concentrate obtained through separation after media are removed, then the roughing concentrate is fed into a dry strong magnetic separator for fine selection to obtain concentrate and tailings, and materials which are obtained through classification and are smaller than 1 mm need to be processed through a segment of closed circuit grinding, a segment of low-intensity magnetic separation and a segment of strong magnetic separation to obtain concentrate and tailings; medium solids mixed in fluidized bed separation products are screened out through a medium drainage screen, non-magnetic impurities in the fluidized bed separation products are removed through magnetic separation, and obtained magnetic separation concentrate serves as recycling media for recycling; an air inducing device is arranged to recycle dust generated in the separation process. According to the iron ore dry separation technology based on the concentrated-phase gas-solid fluidized bed, physical dry separation is adopted in the whole process, water resources do not need to be consumed, energy conservation and environment protection are achieved, and the important significance for efficient utilization of iron ore resources in China and energy conservation and emission reduction is achieved.
Description
Technical field
The present invention relates to a kind of iron ore dry separation technique, be specifically related to a kind of iron ore dry separation technique based on dense gas solid bed.
Technical background
China's iron ore resource rich reserves, along with the development of steel and iron industry, the reserves of high-grad iron ore deposit and the poor iron ore of Yi Xuan are increasingly exhausted.Domestic steel industry depends on import resources too much, and for ensureing the supply security of China's iron ore resource, the efficient separation technical research carrying out iron ore has important strategic importance.
Current iron ore dressing normally adopts the methods such as calcining magnetic separation, flotation, gravity treatment and high intensity magnetic separation.Adopt the method for calcining magnetic separation to be after ore is heated to uniform temperature and carry out physical-chemical reaction in corresponding atmosphere, make that the magnetic of iron ore significantly strengthens and gangue mineral magnetic is constant, and then obtain higher separation index by low intensity magnetic separation, but its energy consumption is large, cost is high, industrial applications difficulty; Flotation utilizes the difference of mineral surfaces wetability, selectively heads, realize valuable mineral to be separated with gangue mineral, flotation can process fine-particle minerals, all have good separating effect for iron ore desiliconization, dephosphorization, but embedding cloth is thin, clay content large, the feature of easy argillization has had a strong impact on floatation indicators because iron ore itself has; The magnetic of some iron ore is more weak, needs by strong magnetic separator sorting, and current high intensity magnetic separation can not the grade of raising iron ore concentrate by a relatively large margin, can not obtain high-grade iron ore concentrate, is generally used for throw tail and desliming in advance; Gravity treatment, according to mineral density differential separation, can obtain more high-grade iron ore concentrate, but the rate of recovery is general lower.
Summary of the invention
The object of the invention is to provide a kind of iron ore dry separation technique based on dense gas solid bed, solve existing iron ore wet split to the consumption of water resource and problem of environmental pollution.
The object of the present invention is achieved like this: sorting process comprises: raw ore preparatory stage, the stage of roughly selecting, selected stage, dense medium purifica tion stage, air feed stage and dedusting stage; The described raw ore preparatory stage is fragmentation in advance and drying, provides granularity, pan feeding moisture all satisfactory raw material for fluid bed; The described stage of roughly selecting comprises gas-solid dense media fluid bed separation and vibrated fluidized bed sorting respectively; The described selected stage comprises ore grinding, classification, low intensity magnetic separation and high intensity magnetic separation process; The described dense medium purifica tion stage comprises the de-mediated of gas-solid dense media fluid bed and vibrated fluidized bed sorted product, and dry type magnetic separation is removed the nonmagnetics be mingled with in medium and ensured the abundant recovery of medium and recycle; The described air feed stage provides enough compressed air for fluid bed, and the dedusting stage removes the dust produced in assorting room, avoids polluting working environment.
Concrete technology is as follows:
A, raw iron ores are through jaw crushing crusher machine, and by double deck screen and 6mm sieve and 100mm sieve, the ore that wherein granularity is greater than 100mm returns disintegrating machine and breaks, the material of 6-100mm grade enters raw ore surge bunker, and the material being less than 6mm will enter follow-up classification and grinding operation; The ore entering raw ore surge bunker need check that whether moisture is more than 5%, otherwise needs to carry out drying process, can feed fluid-bed separator after pan feeding moisture is qualified;
In b, raw ore surge bunker 6-100mm grade dry materials qualified to pan feeding moisture after enter gas-solid dense media fluid bed separation, 1-6mm grade material enters vibrated fluidized bed, and below 0.5mm material then carries out sorting by dry-type magnetic extractor;
C, after the product de-media that vibrated fluidized bed sorting obtains through closed circuit grinding, one section of high intensity magnetic separation, obtain concentrate and tailings, and the raw ore being less than 1mm obtained by raw ore classification is through closed circuit grinding, one section of low intensity magnetic separation and one section of high intensity magnetic separation obtain magnetic concentrate and mine tailing;
The product that d, gas-solid dense media fluid bed and vibrated fluidized bed sorting obtain removes medium through sculping screen, is recycled by dry type magnetic separation; Remove the non-magnetic impurity be mingled with, realize dense medium purifica tion, according to the loss of assorting room medium, new medium need be supplemented and enter in system;
The medium solid used in e, fluid-bed separator is atomization ferrosilicon powder, according to the sorting of dissimilar iron ore, the ferrosilicon powder of different gas speed, the height of bed, Different Silicon content and corresponding particle size range can be selected to make fluidized bed densities at 2.5-4.2g/cm
3adjustable in scope;
The compressed air of f, fluid bed separation equipment is provided by air feed system, and the dust produced in system operation, is removed by dust pelletizing system.
Beneficial effect, owing to have employed such scheme, based on dense gas solid bed sorting process, fully in conjunction with fluidization sorting and high intensity magnetic separation advantage separately, achieve the wholegrain level dry separation of iron ore, avoid in iron ore wet split the consumption of water resource and environmental pollution.In the present invention program, medium solid is atomization ferrosilicon, and its particle is mostly spheric granules, good fluidity, defines the fluidized-bed layer with stable density.Fluidized bed densities can need flexible modulation according to dissimilar iron ore sorting; Owing to using Single Medium, recovery process is simple, solves the technical barrier of binary medium solid fluidized bed densities poor stability, binary medium difficult separation and recycling in existing fluid bed separation technology.
Advantage: have that device structure is simple, cost is low, without the need to consumption of water resource, pollute the advantages such as little, the exploitation for the rare iron ore resource of China provide a new way.
Accompanying drawing explanation
Fig. 1 is the sorting process schematic diagram of iron ore of the present invention.
Detailed description of the invention
Below in conjunction with the embodiment in accompanying drawing, the invention will be further described:
Sorting process of the present invention comprises: raw ore preparatory stage, the stage of roughly selecting, selected stage, dense medium purifica tion stage, air feed stage and dedusting stage; The described raw ore preparatory stage is fragmentation in advance and drying, provides granularity, pan feeding moisture all satisfactory raw material for fluid bed; The described stage of roughly selecting comprises gas-solid dense media fluid bed separation and vibrated fluidized bed sorting respectively; The described selected stage comprises ore grinding, classification, low intensity magnetic separation and high intensity magnetic separation process; The described dense medium purifica tion stage comprises the de-mediated of gas-solid dense media fluid bed and vibrated fluidized bed sorted product, and dry type magnetic separation is removed the nonmagnetics be mingled with in medium and ensured the abundant recovery of medium and recycle; The described air feed stage provides enough compressed air for fluid bed, and the dedusting stage removes the dust produced in assorting room, avoids polluting working environment.
Concrete technology flow process is as follows:
A, raw iron ores are through jaw crushing crusher machine, and by double deck screen and 6mm sieve and 100mm sieve, the ore that wherein granularity is greater than 100mm returns disintegrating machine and breaks, the material of 6-100mm grade enters raw ore surge bunker, and the material being less than 6mm will enter follow-up classification and grinding operation; The ore entering raw ore surge bunker need check that whether moisture is more than 5%, otherwise needs to carry out drying process, can feed fluid-bed separator after pan feeding moisture is qualified;
In b, raw ore surge bunker 6-100mm grade dry materials qualified to pan feeding moisture after enter gas-solid dense media fluid bed separation, 1-6mm grade material enters vibrated fluidized bed, and below 0.5mm material then carries out sorting by dry-type magnetic extractor; The dry separation equipment of sorting section is dense gas solid bed separator, vibrated fluidized bed separator and magnetic separator;
C, after the product de-media that vibrated fluidized bed sorting obtains through closed circuit grinding, one section of high intensity magnetic separation, obtain concentrate and tailings, and the raw ore being less than 1mm obtained by raw ore classification is through closed circuit grinding, one section of low intensity magnetic separation and one section of high intensity magnetic separation obtain magnetic concentrate and mine tailing;
The product that d, gas-solid dense media fluid bed and vibrated fluidized bed sorting obtain removes medium through sculping screen, is recycled by dry type magnetic separation; Remove the non-magnetic impurity be mingled with, realize the purification of medium, according to the loss of assorting room medium, new medium need be supplemented and enter in system;
The medium solid used in e, fluid-bed separator is atomization ferrosilicon powder, according to the sorting of dissimilar iron ore, the ferrosilicon powder of different gas speed, the height of bed, Different Silicon content and corresponding particle size range can be selected to make fluidized bed densities at 2.5-4.2g/cm
3adjustable in scope; Require according to different separating density the ferrosilicon can selecting Different Silicon content, structure adjusting gas speed, the height of bed, ferrosilicon particle size range and silicone content can make fluid bed obtain best separation index; Iron ore sorting in this example, the silicon iron powder particle size range of employing, based on-200+60 order (0.3mm-0.075mm), selects the silicone content of ferrosilicon to be about 6%;
The compressed air of f, fluid bed separation equipment is provided by air feed system, and the dust produced in system operation, is removed by dust pelletizing system.
Embodiment 1: dense gas solid bed and the dry type magnetic separation process integration of iron ore of the present invention comprise: ore preparatory stage, the stage of roughly selecting, selected stage, dense medium purifica tion stage and air feed stage and dedusting stage.
Concrete technology flow process:
1, raw ore is through jaw crushing crusher machine, by double deck screen and 6mm sieve and 100mm sieve, the disintegrating machine that returns being greater than 100mm breaks again, if 6-100mm grade ore moisture is greater than 5% also need dry process, can feed gas-solid dense media fluid bed after pan feeding moisture is qualified, the ore being less than 6mm enters subsequent hierarchical process;
2,6-100mm grade ore obtains floating thing and hypostasis by fluid bed separation, and by the de-mediated of 1mm sculping screen, hypostasis product by after the closed circuit grinding operation of dry grinding mill and 6mm classifying screen composition with raw ore in be less than 6mm ore merge and enter 1mm classifying screen, the ore being greater than 1mm enters vibrated fluidized bed sorting, and the material being less than 1mm enters grinding operation;
3, the product that obtains of vibrated fluidized bed sorting is after de-mediated, also need through closed circuit grinding and one section of high intensity magnetic separation selected, it is selected that the raw ore being less than 1mm enters closed circuit grinding, one section of low intensity magnetic separation and one section of high intensity magnetic separation;
4, the iron ore entering selected operation need make material meet the requirement of dry-type magnetic extractor material size by closed circuit grinding, because the gangue mineral disseminated grain size of different iron ore there are differences, grinding particle size can select the different sizes such as 0.5/0.25/0.1mm according to demand, dry-type magnetic selection apparatus comprises the drum magnetic separator of low intensity magnetic separation, the Induced Roll Magnetic Separator of high intensity magnetic separation or disk-type magnetic separator; What weak magnetic separation equipment was selected is drum magnetic separator, high intensity magnetic separation equipment choosing be Induced Roll Magnetic Separator or disk-type magnetic separator;
5, the dense media that reclaims of fluid bed separation process, needs to remove non-magnetic impurity wherein by magnetic separation, reaches purification object, finally return in fluid bed and reuse, according to the loss of medium, need to add a certain amount of new medium in system;
6, the compressed air of fluid bed separation equipment is provided by air feed system, and the dust produced in system operation, is removed by dust pelletizing system.
The above is only the preferred embodiment of the present invention, is not limited to the present invention.Under the premise without departing from the principles of the invention, the present invention can have various change and change, all to amendment of the present invention and converting all within protection scope of the present invention on an equal basis.
Claims (2)
1. based on an iron ore dry separation technique for dense gas solid bed, it is characterized in that: sorting process comprises: raw ore preparatory stage, the stage of roughly selecting, selected stage, dense medium purifica tion stage, air feed stage and dedusting stage; The described raw ore preparatory stage is fragmentation in advance and drying, provides granularity, pan feeding moisture all satisfactory raw material for fluid bed; The described stage of roughly selecting comprises gas-solid dense media fluid bed separation and vibrated fluidized bed sorting respectively; The described selected stage comprises ore grinding, classification, low intensity magnetic separation and high intensity magnetic separation process; The described dense medium purifica tion stage comprises the de-mediated of gas-solid dense media fluid bed and vibrated fluidized bed sorted product, and dry type magnetic separation is removed the nonmagnetics be mingled with in medium and ensured the abundant recovery of medium and recycle; The described air feed stage provides enough compressed air for fluid bed, and the dedusting stage removes the dust produced in assorting room, avoids polluting working environment.
2., according to claim 1 based on the iron ore dry separation technique of dense gas solid bed, it is characterized in that: concrete technology is as follows:
Raw iron ores is through jaw crushing crusher machine, and by double deck screen and 6mm sieve and 100mm sieve, the ore that wherein granularity is greater than 100mm returns disintegrating machine and breaks, and the material of 6-100mm grade enters raw ore surge bunker, and the material being less than 6mm will enter follow-up classification and grinding operation; The ore entering raw ore surge bunker need check that whether moisture is more than 5%, otherwise needs to carry out drying process, can feed fluid-bed separator after pan feeding moisture is qualified;
In raw ore surge bunker 6-100mm grade dry materials qualified to pan feeding moisture after enter gas-solid dense media fluid bed separation, 1-6mm grade material enters vibrated fluidized bed, and below 0.5mm material then carries out sorting by dry-type magnetic extractor;
Through closed circuit grinding after the product de-media that vibrated fluidized bed sorting obtains, one section of high intensity magnetic separation, obtain concentrate and tailings, and the raw ore being less than 1mm obtained by raw ore classification is through closed circuit grinding, one section of low intensity magnetic separation and one section of high intensity magnetic separation obtain magnetic concentrate and mine tailing;
The product that gas-solid dense media fluid bed and vibrated fluidized bed sorting obtain removes medium through sculping screen, is recycled by dry type magnetic separation; Remove the non-magnetic impurity be mingled with, realize the purification of medium, according to the loss of assorting room medium, new medium need be supplemented and enter in system;
The medium solid used in fluid-bed separator is atomization ferrosilicon powder, according to the sorting of dissimilar iron ore, the ferrosilicon powder of different gas speed, the height of bed, Different Silicon content and corresponding particle size range can be selected to make fluidized bed densities at 2.5-4.2g/cm
3adjustable in scope;
The compressed air of f, fluid bed separation equipment is provided by air feed system, and the dust produced in system operation, is removed by dust pelletizing system.
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| CN113981209A (en) * | 2021-10-14 | 2022-01-28 | 辽宁科技大学 | Method for recovering zinc and iron in blast furnace gas dust |
| CN114849892A (en) * | 2022-05-07 | 2022-08-05 | 金易通（天津）智能装备有限公司 | Dry dust-free lump material dry separation method and system |
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| CN109317289A (en) * | 2018-11-14 | 2019-02-12 | 王光领 | Dry sand medium preparation process is used on air dry sand Recognition Applied in Coal Preparation System |
| CN113981209A (en) * | 2021-10-14 | 2022-01-28 | 辽宁科技大学 | Method for recovering zinc and iron in blast furnace gas dust |
| CN114849892A (en) * | 2022-05-07 | 2022-08-05 | 金易通（天津）智能装备有限公司 | Dry dust-free lump material dry separation method and system |
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