CN104815739A - Magnetite dry grinding and dry separation method and device - Google Patents
Magnetite dry grinding and dry separation method and device Download PDFInfo
- Publication number
- CN104815739A CN104815739A CN201510237394.7A CN201510237394A CN104815739A CN 104815739 A CN104815739 A CN 104815739A CN 201510237394 A CN201510237394 A CN 201510237394A CN 104815739 A CN104815739 A CN 104815739A
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- dry
- wind
- pressure roller
- high pressure
- ore
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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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
Abstract
The invention discloses a magnetite dry grinding and dry separation method and a magnetite dry grinding and dry separation device, and belongs to the technical field of iron ore selection and grinding. The method comprises the steps of mixing secondarily crushed ore with particle size less than 80mm and coarse-grain return scrap to obtain a mixture I, extruding the mixture I by virtue of a high pressure roller, and mechanically screening the mixture I, wherein the screening granularity is 3mm; returning an oversize product adopted as the coarse-grain return scrap to the high pressure roller to be continuously extruded, separating screen underflow in a dry-type magnetic separator, grading rough concentrate separated by the dry-type magnetic separator by virtue of a wind power powder separation machine, returning coarse powder graded by the wind power powder separation machine and adopted as coarse-grain return scrap to the high pressure roller to be continuously extruded, collecting fine powder meeting the fineness requirement of iron fine powder after the grading of the wind power powder separation machine, separating the fine powder by virtue of the dry-type magnetic separator, and finally carrying out the wet-type magnetic separation for fine magnetic minerals meeting the fineness requirement of the iron fine powder after the separation of the dry-type magnetic separator. By adopting the magnetite dry grinding and dry separation method, the crushing grinding and the magnetic separation of the ore are reasonably matched, so that the system energy consumption is reduced, consumption of steel and water is reduced, and the environmental pollution is alleviated.
Description
Technical field
The invention belongs to iron ore beneficiation ore grinding technical field.
Background technology
In magnetite separation industry, the preparation of Iron concentrate needs to reach certain taste and fineness, in iron ore original ore size being tapered and sampling the process that improves gradually, because efficiency of magnetic separation and iron ore granularity have obvious relation, and certain granularity needs acting, energy consumption accordingly will be reached, consider the maximization of economic benefit, just need the ore grain size that choose reasonable magnetic separation at different levels is corresponding.Traditional crushing and grinding has come primarily of disintegrating machine and tube mill, because disintegrating machine limit by equipment performance and power consumption, the stage in small, broken bits (being generally crushed to <12mm) can only be proceeded to, then corase grind and fine grinding has been come by tube mill, and enter mill before ore magnetic separation granularity also (being generally <12mm) bigger than normal, efficiency of magnetic separation has much room for improvement, and the full iron recovery of iron ore is lower.Tube mill power consumption steel consumption is higher, and general fine grinding all adopts wet ball-milling, and water consumption is large, and tailings glass cost is high, and environmental pollution is larger.Also high-pressure roller mill was introduced in the grinding system of iron ore by some technology in recent years, but just instead of part in small, broken bits and corase grind, solve the problem of disintegrating machine discharging-material size considerable influence efficiency of magnetic separation, but the material after high-pressure roller mill grinding also needs to carry out fine grinding by tube mill, high to tube mill energy consumption and that water consumption is large problem does not fully solve.
Summary of the invention
The object of the invention is to: for adopting traditional iron ore treatment process, the grinding pow consumption steel consumption of ore is higher, water consumption is large, and wet mine tailing amount is large, and processing cost is high, the granularity entirety of mine tailing ore magnetic separation is higher, efficiency of magnetic separation is on the low side, and full iron recovery is on the low side, and limit because pipe grinds ability, make raw ore treatment scale limited, be difficult to maximize.The present invention solves the problem to provide a kind of new method and apparatus, by the crushing and grinding of ore and magnetic separation reasonably combined, reduce system energy consumption, steel consume, water consume, alleviate the pollution to environment.
The object of the invention is realized by following technical proposals:
A kind of magnetic iron ore dry grinding dry dressing method, be: in the ore of broken rear <80mm mix with coarse grain returns, after high pressure roller extruding, deliver to mechanical grading, Sieving and casing is 3mm, oversize returns high pressure roller as described coarse grain returns and continues extruding, screenings enters dry-type magnetic extractor sorting, the rough concentrate of dry-type magnetic extractor sorting delivers to the classification of wind-force powder concentrator, meal after the classification of wind-force powder concentrator also returns high pressure roller as described coarse grain returns and continues extruding, after reaching the fines collection of Iron concentrate fineness requirement after the classification of wind-force powder concentrator, deliver to dry-type magnetic extractor sorting, wet magnetic separation is finally carried out in the thin magnetic ore deposit reaching Iron concentrate fineness requirement after dry-type magnetic extractor sorting.
In such scheme, after supplied materials extrudes by high pressure roller mill, Iron concentrate fineness requirement is reached after being sorted by twice granularity, no longer need follow-up grinding machine grinding, the coarse granule after each granularity sorts returns high pressure roller and continues extruding, and fine grained all carries out a dry type magnetic separation, ore taste is improved thus in the dry separation stage, reduce wet magnetic separation proportion, water consumption is little, and wet mine tailing amount is little.Described high pressure roller refers to roll squeezer or high-pressure roller mill; Fine powder/thin magnetic the ore deposit of described Iron concentrate fineness requirement refers to that 200um sieve is by 50-70%, different according to different iron ore percent of pass.Specifically there is following substantive distinguishing features:
(1) disintegrating machine is needed in hinge structure by small, broken bits for ore to <12mm, then corase grind and fine grinding has been come by tube mill, all traditional in small, broken bits and two-stage pipe abrasive dust grinding process is substituted by high pressure roller mill in aforementioned schemes of the present invention, by the whole grinding technology of high pressure roller mill complete independently to ore, reach the granularity requirements of ore magnetic separation to breeze, reduce traditional grinding process power consumption and steel consumption.
(2) according to iron ore characteristic, machinery is adopted to select powder and winnowing powder to have combined the particle size separation process of breeze, high pressure roller discharging first time granularity sorts and adopts mechanical picker to complete, greatly reduce system power consumption, second time granularity sorts and adopts powder concentrator pneumatic separating, selects the Iron concentrate of qualified fineness.Simultaneously, machinery is adopted to select powder and winnowing powder to combine technique, both meet the requirement of magnetic separation step by step of ore point granularity stage by stage, solved again the screening of the unappeasable subparticle of mechanical grading, also reduce the problem that the system power consumption that adopts winnowing powder to bring completely is high.
(3) specific selected 3mm is Sieving and casing, adopts dry type magnetic separation, can ensure full iron recovery, can improve efficiency of magnetic separation again below 3mm particle, and the problem that the water consumption thoroughly solving wet magnetic separation technique is large.
As selection, in broken after ore in small, broken bits to <30mm further, mix with coarse grain returns, enter high pressure roller extruding.
In such scheme, roll squeezer Some substitute is in small, broken bits and substitute corase grind and fine grinding completely: only need in small, broken bits to <30mm in advance, and the in small, broken bits and corase grind of remaining part, fine grinding process all completes by roll squeezer.
As selection, described mechanical grading is linear vibrating screen.
As selection, the fine powder reaching Iron concentrate fineness requirement after the classification of described wind-force powder concentrator is collected by bag collector.
As further selection, the air path system of described wind-force powder concentrator is completed by the exhaust gas fan after wind-force powder concentrator and bag collector, natural wind is introduced in wind-force powder concentrator, and the dust-laden wind after being separated by powder concentrator enters bag collector, and the clean gas after gathering dust is arranged outward.
A kind of device for aforementioned magnetic iron ore dry grinding dry dressing method, comprise high pressure roller, dry-type magnetic extractor, mechanical sifter, wind-force powder concentrator, fines collection device and wet magnetic separation device, described high pressure roller surge bunker is ore entrance, the discharging opening of described high pressure roller connects through conveying device delivers to described mechanical sifter, the Sieving and casing of described mechanical sifter is 3mm, the oversize outlet of described mechanical sifter is connected to described high pressure roller surge bunker through conveying device, the screenings outlet of described mechanical sifter is connected to dry-type magnetic extractor through conveying device, the rough concentrate outlet of dry-type magnetic extractor is connected to described wind-force powder concentrator through conveying device, the meal outlet of wind-force powder concentrator is connected to described high pressure roller surge bunker through conveying device, the fine powder outlet of wind-force powder concentrator is connected to dry-type magnetic extractor through fines collection device and conveying device, the thin magnetic ore deposit outlet of dry-type magnetic extractor is connected to described wet magnetic separation device through conveying device.
As selection, described mechanical sifter is linear vibrating screen.
As selection, described fines collection device is bag collector.
The main scheme of aforementioned the present invention and each further selection scheme thereof can independent assortment to form multiple scheme; be the present invention can adopt and claimed scheme: as the present invention; each selection can select any combination with other; those skilled in the art can understand there is multiple combination according to prior art and common practise after understanding the present invention program; be the claimed technical scheme of the present invention, do not do exhaustive at this.
Beneficial effect of the present invention: the present invention adopts high pressure roller mill complete independently to the grinding process of iron ore, by the crushing and grinding of ore and magnetic separation reasonably combined, iron ore taste is improve as much as possible in the dry separation stage, reduce the throwing tail amount of wet magnetic separation, water consumption greatly reduces, and the obvious minimizing of wet mine tailing amount it can make the corresponding minimizing of processing cost, and remarkable in economical benefits improves.The present invention is according to iron ore characteristic, the grading of ore is divided into and roughly selects and carefully select two parts, machinery is adopted to select powder and winnowing powder to have combined the particle size separation process of breeze, roughly select employing mechanical grading, the power consumption greatly saved, thin choosing adopts air classification, solves the problem that current dry-type mechanical screen size can not be too small.
The invention solves magnetic iron ore sorts in dry magnetic separation stage granularity bigger than normal, and dry magnetic separation efficiency is on the low side, and it is little that concentrate grade promotes amplitude, and iron ore grade is lifted at the problem that in the large wet magnetic separation of water requirement, accounting is excessive; Solve the fine grinding of conventional iron ore and adopt ball milling wet-milling, the problem that steel consumption is high, power consumption is high, water requirement is large and treating capacity is little.
The present invention adopts above-mentioned original creation technology, by the crushing and grinding of ore and magnetic separation reasonably combined, reduce wet magnetic separation proportion in ore dressing process, the disintegrating machine of hinge structure and tube mill (fine grinding employing wet ball-milling) technique, can improve full iron recovery about 10%, can reduce system power consumption about 20%, reduction system steel consumption 50%, reduce system water consumption 75%, improve economic benefit, alleviate environmental pollution.
Accompanying drawing explanation
Fig. 1 is the device flow chart of the embodiment of the present invention;
1 be surge bunker, 2 be wherein high pressure roller, 3 be linear vibrating screen, 4 be dry-type magnetic extractor, 5 be wind-force powder concentrator, 6 be bag collector, 7 be exhaust gas fan, 8 for wet magnetic separation device.
Detailed description of the invention
Following non-limiting examples is for illustration of the present invention.
Shown in figure 1, the ore of the <80mm after crushing-magnetic selection directly delivers to high pressure roller surge bunker 1 through belt, or, in small, broken bitsly to <30mm, send into high pressure roller surge bunker 1 again, ore first mixes in surge bunker with coarse grain returns, after high pressure roller 2 extrudes, delivers to linear vibrating screen 3 screen by belt, Sieving and casing is 3mm, and oversize (>3mm) is delivered to high pressure roller surge bunker 1 through belt and continued extruding.Linear vibrating screen 3 screenings (<3mm) enters dry-type magnetic extractor 4 sorting, barren rock delivers to barren rock stockyard through belt, rough concentrate is through belt feeder, wind-force powder concentrator 5 classification delivered to by elevator, after classification, meal (<3mm) sends high pressure roller surge bunker 1 continuation extruding back to through belt, fine powder (reaching Iron concentrate fineness requirement) is after bag collector 6 is collected, dry-type magnetic extractor 4 sorting is delivered to through belt feeder, mine tailing delivers to barren rock stockyard through belt, thin magnetic ore deposit (reaching Iron concentrate fineness requirement) is delivered to follow-up workshop wet magnetic separation device 8 and is carried out.Powder concentrator air path system is completed by the exhaust gas fan 7 after wind-force powder concentrator 5 and bag collector 6, and natural wind is introduced in wind-force powder concentrator 5, and enter bag collector 6 by the dust-laden wind after wind-force powder concentrator 5 is separated, the clean gas after gathering dust is arranged outward.Dry separation dry grinding workshop each point gathers dust and to be completed by dust-precipitator.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a magnetic iron ore dry grinding dry dressing method, it is characterized in that: in the ore of broken rear <80mm mix with coarse grain returns, after high pressure roller extruding, deliver to mechanical grading, Sieving and casing is 3mm, oversize returns high pressure roller as described coarse grain returns and continues extruding, screenings enters dry-type magnetic extractor sorting, the rough concentrate of dry-type magnetic extractor sorting delivers to the classification of wind-force powder concentrator, meal after the classification of wind-force powder concentrator also returns high pressure roller as described coarse grain returns and continues extruding, after reaching the fines collection of Iron concentrate fineness requirement after the classification of wind-force powder concentrator, deliver to dry-type magnetic extractor sorting, wet magnetic separation is finally carried out in the thin magnetic ore deposit reaching Iron concentrate fineness requirement after dry-type magnetic extractor sorting.
2. magnetic iron ore dry grinding dry dressing method as claimed in claim 1, is characterized in that: in broken after ore in small, broken bits to <30mm further, mix with coarse grain returns, enters high pressure roller and extrude.
3. magnetic iron ore dry grinding dry dressing method as claimed in claim 1, is characterized in that: described mechanical grading is linear vibrating screen.
4. magnetic iron ore dry grinding dry dressing method as claimed in claim 1, is characterized in that: the fine powder reaching Iron concentrate fineness requirement after the classification of described wind-force powder concentrator is collected by bag collector.
5. magnetic iron ore dry grinding dry dressing method as claimed in claim 4, it is characterized in that: the air path system of described wind-force powder concentrator is completed by the exhaust gas fan after wind-force powder concentrator and bag collector, natural wind is introduced in wind-force powder concentrator, dust-laden wind after being separated by powder concentrator enters bag collector, and the clean gas after gathering dust is arranged outward.
6. the device for the magnetic iron ore dry grinding dry dressing method described in claim arbitrary in claim 1 to 5, it is characterized in that: comprise high pressure roller, dry-type magnetic extractor, mechanical sifter, wind-force powder concentrator, fines collection device and wet magnetic separation device, described high pressure roller surge bunker is ore entrance, the discharging opening of described high pressure roller connects through conveying device delivers to described mechanical sifter, the Sieving and casing of described mechanical sifter is 3mm, the oversize outlet of described mechanical sifter is connected to described high pressure roller surge bunker through conveying device, the screenings outlet of described mechanical sifter is connected to dry-type magnetic extractor through conveying device, the rough concentrate outlet of dry-type magnetic extractor is connected to described wind-force powder concentrator through conveying device, the meal outlet of wind-force powder concentrator is connected to described high pressure roller surge bunker through conveying device, the fine powder outlet of wind-force powder concentrator is connected to dry-type magnetic extractor through fines collection device and conveying device, the thin magnetic ore deposit outlet of dry-type magnetic extractor is connected to described wet magnetic separation device through conveying device.
7. magnetic iron ore dry grinding dry separation device as claimed in claim 6, is characterized in that: described mechanical sifter is linear vibrating screen.
8. magnetic iron ore dry grinding dry separation device as claimed in claim 6, is characterized in that: described fines collection device is bag collector.
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| CN201510237394.7A CN104815739B (en) | 2015-05-11 | 2015-05-11 | Magnetite dry grinding and dry separation method and device |
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| CN201510237394.7A CN104815739B (en) | 2015-05-11 | 2015-05-11 | Magnetite dry grinding and dry separation method and device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105413842A (en) * | 2015-12-16 | 2016-03-23 | 中冶沈勘秦皇岛工程技术有限公司 | Mineral separation process and system for ultra-lean magnetite ore |
| CN106111318A (en) * | 2016-07-05 | 2016-11-16 | 河南理工大学 | A kind of strongly magnetic mineral classification fluidization low intensity magnetic separation device |
| CN106622619A (en) * | 2016-11-28 | 2017-05-10 | 攀枝花市仁通钒业有限公司 | Grinder |
| CN106938219A (en) * | 2017-04-27 | 2017-07-11 | 酒泉钢铁(集团)有限责任公司 | A kind of beneficiation method of extreme poverty sand iron ore |
| CN107159429A (en) * | 2017-07-11 | 2017-09-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of hermetically sealed dry grinding dry separation craft of iron ore |
| CN107661814A (en) * | 2017-10-31 | 2018-02-06 | 中冶北方（大连）工程技术有限公司 | One kind screening magnetic separation mill ore magnetic selection flow sheet equipment arrangement system |
| CN108380380A (en) * | 2018-03-29 | 2018-08-10 | 安徽马钢张庄矿业有限责任公司 | Product dry type fine crushing sorts Iron concentrate technique |
| CN109569836A (en) * | 2018-10-28 | 2019-04-05 | 王腾 | Potash feldspar ore, albite deferrization of dry process removal of impurities purifying technique and system |
| CN110180664A (en) * | 2019-07-03 | 2019-08-30 | 北京坚构创新科技有限公司 | Half final grinding system of one kind and method |
| WO2020097666A1 (en) * | 2018-11-14 | 2020-05-22 | IB Operations Pty Ltd | Method and apparatus for processing magnetite |
| CN113286658A (en) * | 2018-11-27 | 2021-08-20 | 福特斯丘金属集团 | Apparatus and method for treating iron ore |
| CN114260095A (en) * | 2021-12-22 | 2022-04-01 | 安徽大昌矿业集团有限公司 | Beneficiation method and device for preparing ultrapure iron concentrate by using magnetite concentrate |
| CN114618634A (en) * | 2022-03-28 | 2022-06-14 | 胡沿东 | Dry grinding and dry separation process for ore |
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| CN106938219A (en) * | 2017-04-27 | 2017-07-11 | 酒泉钢铁(集团)有限责任公司 | A kind of beneficiation method of extreme poverty sand iron ore |
| CN107159429A (en) * | 2017-07-11 | 2017-09-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of hermetically sealed dry grinding dry separation craft of iron ore |
| CN107661814A (en) * | 2017-10-31 | 2018-02-06 | 中冶北方（大连）工程技术有限公司 | One kind screening magnetic separation mill ore magnetic selection flow sheet equipment arrangement system |
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| CN108380380A (en) * | 2018-03-29 | 2018-08-10 | 安徽马钢张庄矿业有限责任公司 | Product dry type fine crushing sorts Iron concentrate technique |
| CN109569836A (en) * | 2018-10-28 | 2019-04-05 | 王腾 | Potash feldspar ore, albite deferrization of dry process removal of impurities purifying technique and system |
| CN109569836B (en) * | 2018-10-28 | 2021-09-03 | 山东天发永磁磁电科技有限公司 | Dry method iron-removing impurity-removing purification process and system for potash feldspar ore and albite |
| CN113260724A (en) * | 2018-11-14 | 2021-08-13 | 铁桥运营私人有限公司 | Method and apparatus for processing magnetite |
| WO2020097666A1 (en) * | 2018-11-14 | 2020-05-22 | IB Operations Pty Ltd | Method and apparatus for processing magnetite |
| EP3880854A4 (en) * | 2018-11-14 | 2022-08-31 | IB Operations Pty Ltd | Method and apparatus for processing magnetite |
| AU2021200895B2 (en) * | 2018-11-14 | 2022-11-03 | IB Operations Pty Ltd | Method and apparatus for processing magnetite |
| CN113286658A (en) * | 2018-11-27 | 2021-08-20 | 福特斯丘金属集团 | Apparatus and method for treating iron ore |
| CN110180664A (en) * | 2019-07-03 | 2019-08-30 | 北京坚构创新科技有限公司 | Half final grinding system of one kind and method |
| CN114260095A (en) * | 2021-12-22 | 2022-04-01 | 安徽大昌矿业集团有限公司 | Beneficiation method and device for preparing ultrapure iron concentrate by using magnetite concentrate |
| CN114260095B (en) * | 2021-12-22 | 2024-02-02 | 安徽大昌矿业集团有限公司 | Ore dressing method and device for preparing ultra-pure iron concentrate from magnetite concentrate |
| CN114618634A (en) * | 2022-03-28 | 2022-06-14 | 胡沿东 | Dry grinding and dry separation process for ore |
| CN114618634B (en) * | 2022-03-28 | 2023-09-22 | 胡沿东 | Dry grinding and dry separation process of ore |
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