CN104588202A - Beneficiation method for extremely lean iron ore pre-separation tailings - Google Patents
Beneficiation method for extremely lean iron ore pre-separation tailings Download PDFInfo
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- CN104588202A CN104588202A CN201510044470.2A CN201510044470A CN104588202A CN 104588202 A CN104588202 A CN 104588202A CN 201510044470 A CN201510044470 A CN 201510044470A CN 104588202 A CN104588202 A CN 104588202A
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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
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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Abstract
The invention discloses a beneficiation method for extremely lean iron ore pre-separation tailings, and belongs to the technical field of mineral processing. The method comprises the following step: (1) smashing extremely lean iron ore pre-separation tailings, and grinding; (2) performing low intensity magnetic separation and high intensity magnetic separation, and combining strong magnetic concentrate and weak magnetic concentrate into mixed coarse ore; (3) filtering the mixed coarse ore, heating the mixed coarse ore to 580-700 DEG C, preserving heat for 20-120 seconds, putting the mixed coarse ore under a reducing atmosphere condition for preserving heat for 3-60 minutes, and cooling in the air to a temperature below 50 DEG C; (4) adding water to prepare ore pulp, stirring and performing pre-separation; (5) finely grinding, performing concentration, and filtering water from concentrate. According to the method, the high intensity magnetic separation and low intensity magnetic separation, calcination and reduction, and pre-separation-grinding and concentration are performed to obtain a product of which the iron grade is larger than 60 percent. The product has a stable index and high economical performance, and resources can be effectively utilized.
Description
Technical field
The invention belongs to technical field of mineral processing, particularly a kind of beneficiation method of Extremely lean iron ore preliminary rejection.
Background technology
The iron ore grade of Anshan Iron and Steel Group of mining company's mountain iron ore extraction is at the moment on the low side, therefore magnetic pulley is utilized to carry out a preliminary election at stope, concentrate after preliminary election, deliver to The Great Hermit Hill pelletizing plant and carry out ore dressing process, and there is mine with regard to heap in remaining next mine tailing, a kind of extreme poverty Anshan type iron mine stone preliminary rejection, had at present millions of tons to storage, but also with the quantity of annual 1000000 tons increase.
The grade about 20% of mountain pre-separation using magnetic pulley mine tailing at the moment, its main feature is as follows:
(1) metalliferous mineral of this iron ore is mainly iron mineral, and metal sulfide content is very low, and iron mineral is based on bloodstone, and magnetic iron ore, content of limonite are less.Nonmetallic mineral is mainly quartz and siderite, and other nonmetallic mineral has calcite, dolomite, chlorite and muscovite etc.;
(2) in ore, iron-bearing mineral mainly contains bloodstone, siderite, magnetic iron ore, limonite and some iron content nonmetallic minerals, as dolomite, chlorite etc., wherein the content of bloodstone and siderite is more, for mainly reclaiming mineral, magnetic iron ore can reclaim with bloodstone magnetic separation, and other iron-bearing mineral loses because reclaiming;
(3) bloodstone and siderite are for mainly to reclaim mineral, and the mineralogical property difference of the two is very large, and dressing method is also just different, and the technological process that mineral reclaim is complicated, increases the difficulty sorted;
(4) in ore, bloodstone and quartz wait nonmetallic mineral to be combined comparatively closely, and mutual parcel, be difficult to each other dissociate completely.Embedding cloth relation between bloodstone and magnetic iron ore is comparatively close, and bloodstone explanation magnetic iron ore, forms unmixing crystal stock.Bloodstone is by limonite Filling Cementation, and the limonite of intergranular normal filling net veiny, so bloodstone and limonite are difficult to dissociate completely, limonite enters iron ore concentrate will affect iron concentrate grade.There is part bloodstone particulate to be wrapped in limonite in addition, be difficult to dissociate out, be easily lost in mine tailing with limonite, affect the yield of iron;
(5) the embedding cloth relation of siderite and other nonmetallic mineral is more complicated, siderite and the tight symbiosis of other carbonate mineral such as calcite, dolomite, mostly is the mutual embedding cloth of particulate, and mutual is wrapped up; The intergranular that siderite is often veiny, net veiny is filled in quartz, the quartz of parcel particulate; Siderite is normal together with the mixed life such as chlorite, muscovite, and complicated embedding cloth each other, is therefore difficult between siderite and nonmetallic mineral dissociate.The embedding cloth relation of the metalliferous mineral such as siderite and bloodstone is very tight, often along the intergranular of metalliferous mineral and fracture filling cementing, and coated metal mineral, combine very closely, dissociating each other between siderite and bloodstone is also more difficult;
(6) the dip-dye granularity of bloodstone and siderite is all very uneven.Hematite content is more, and what especially micro-bloodstone had is wrapped in quartz, is difficult to monomer dissociation.The dip-dye granularity of siderite based on the embedding cloth of coarse grain, uneven distribution, some particulate siderites generally in fine pulse-like, the distribution of net veiny, what have is distributed in other mineral in acinous inclusion enclave, more difficultly dissociates completely.
In view of the These characteristics of mountain pre-separation using magnetic pulley mine tailing at the moment, conventional beneficiation flowsheet is adopted to realize sorting.
Summary of the invention
For the problems referred to above that existing extreme poverty Anshan type iron mine stone preliminary rejection technique of preparing exists, the invention provides a kind of beneficiation method of Extremely lean iron ore preliminary rejection, by the mode of preconcentration, heat reduction and magnetic separation, while reducing costs, improve yield and obtain high grade iron mineral products.
The beneficiation method of Extremely lean iron ore preliminary rejection of the present invention is carried out according to the following steps:
1, Extremely lean iron ore preliminary rejection is crushed to granularity≤15mm, put into the closed circuit grinding system that ball mill and cyclone form and carry out ore grinding process, the part obtaining granularity-0.074mm in Grading Overflow product accounts for 60 ~ 90% of Extremely lean iron ore gross weight; The Iron grade of described Extremely lean iron ore preliminary rejection is 15 ~ 25%;
2, Grading Overflow product is carried out low intensity magnetic separation by weak magnetic separator, obtain low intensity magnetic separation concentrate and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing is carried out high intensity magnetic separation by intensity magnetic separator, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing, high intensity magnetic separation concentrate and low intensity magnetic separation concentrate are merged as mixing rough;
3, will mix rough filter obtain water weight 10 ~ 20% filter cake, then be heated to 580 ~ 700 DEG C of insulation 20 ~ 120s and remove moisture, make carbonate decomposition and preliminary election mixing rough middle iron content mineral convert bloodstone to, then 3 ~ 60min is incubated under being placed in reducing atmosphere condition, air cooling is to lower than 50 DEG C again, obtains magnet rough;
4, rough for magnet adding water is made the ore pulp of weight concentration 25 ~ 40%, stir 5 ~ 40min and eliminate Electrostatic Absorption and reunion, then carry out preliminary election with drum magnetic separator, controlling magnetic field intensity is 0.11 ~ 0.3T, and the pre-concentrate selection of acquisition is as rough concentrate;
5, account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, then carry out selected with electromagnetic refiner, the selected concentrate of acquisition filters removes moisture, obtains the concentrate product of Iron grade 63 ~ 68%.
In said method, when carrying out selected with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5 ~ 2A, ascending current speed 5 ~ 30cm/s.
Above-mentioned reducing atmosphere is coal gas atmosphere or hydrogen atmosphere.
In said method, the rate of recovery >=78% of iron.
In said method, mix rough Iron grade 20 ~ 35%.
In said method, the rough Iron grade of magnet is 23 ~ 38%.
In said method, the Iron grade of rough concentrate is 60 ~ 63%.
In said method, magnetic field intensity during low intensity magnetic separation is 0.1 ~ 0.3T, and magnetic field intensity during high intensity magnetic separation is 0.8 ~ 1.5T.
Method of the present invention, by high intensity magnetic separation and low intensity magnetic separation, then through roasting and reduction (in heating process, non magnetic bloodstone is converted into magnetic bloodstone), then carries out preliminary election-ore grinding and selected, obtain the product that Iron grade is greater than 63%, product index is stablized, and good economy performance, resource can obtain efficiency utilization.
Accompanying drawing explanation
Fig. 1 is the beneficiation method schematic flow sheet of Extremely lean iron ore preliminary rejection of the present invention.
Detailed description of the invention
The ball mill adopted in the embodiment of the present invention is tumbling ball mill, and ball-milling medium is steel ball or steel forging.
The one section of intensity magnetic separator adopted in the embodiment of the present invention and two sections of intensity magnetic separators are Slon and found ring electromagnetic pulsating high gradient magnetic separator.
When carrying out ore grinding process in the embodiment of the present invention, ore milling concentration when ball mill carries out ball milling is 70 ~ 80%, and ore deposit pressure during cyclone classification is 0.15 ~ 0.5MPa.
The electromagnetic refiner adopted in the embodiment of the present invention is DFXL-II type electromagnetic refiner.
Extreme poverty Anshan type iron mine stone preliminary rejection in the embodiment of the present invention is Anshan Iron and Steel Group of mining company's mountain pre-separation using magnetic pulley mine tailing at the moment, and chemical multielement analysis result is: TFe 21 ~ 22wt %, FeO 14 ~ 15wt %, SiO
250 ~ 51wt %, Al
2o
34 ~ 4.5wt %, CaO 1 ~ 1.5wt %, MgO 2 ~ 2.5wt %, all the other are that S, P and burning lose composition; Show that essential element is iron, silicon, aluminium, calcium, magnesium, harmful element content is relatively low.
Extreme poverty Anshan type iron mine stone carries out material phase analysis result as table 1;
Table 1
The essential mineral form of iron is bloodstone and siderite.
Embodiment 1
Extreme poverty Anshan type iron mine stone preliminary rejection is crushed to granularity≤15mm, and put into the closed circuit grinding system that ball mill and cyclone form and carry out ore grinding process, the part obtaining granularity-0.074mm in Grading Overflow product accounts for 60% of extreme poverty Anshan type iron mine stone gross weight; The Iron grade of described extreme poverty Anshan type iron mine stone is 25%;
Grading Overflow product is carried out low intensity magnetic separation by weak magnetic separator, obtain low intensity magnetic separation concentrate and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing is carried out high intensity magnetic separation by intensity magnetic separator, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing, high intensity magnetic separation concentrate and low intensity magnetic separation concentrate are merged as mixing rough; Mix rough Iron grade 35%; Magnetic field intensity during low intensity magnetic separation is 0.1T, and magnetic field intensity during high intensity magnetic separation is 0.8T;
The filter cake of rough filtration acquisition water weight 10% will be mixed, adopt suspending magnetization roasting furnace to be heated to 700 DEG C of insulation 20s and remove moisture, make carbonate decomposition and preliminary election mixing rough middle iron content mineral convert bloodstone to, then be placed in High-temperature mineral powder cooling device, 3min is incubated under reducing atmosphere condition, air cooling is to lower than 50 DEG C again, obtains magnet rough; The rough Iron grade of magnet is 38%; Reducing atmosphere is coal gas atmosphere;
Rough for magnet adding water is made the ore pulp of weight concentration 25%, and stir 5min and eliminate Electrostatic Absorption and reunion, then carry out preliminary election with drum magnetic separator, controlling magnetic field intensity is 0.11T, and the pre-concentrate selection of acquisition is as rough concentrate; The Iron grade of rough concentrate is 63%;
More than 95% of rough concentrate gross weight is accounted for granularity-400 object part by levigate for rough concentrate, then carry out selected with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5A, ascending current speed 5cm/s, the selected concentrate obtained filters removes moisture, obtain the concentrate product of Iron grade 68%, the rate of recovery 79% of iron.
Embodiment 2
Method is with embodiment 1, and difference is:
(1) Iron grade of extreme poverty Anshan type iron mine stone preliminary rejection preliminary rejection is 22%; In Grading Overflow product, the part of granularity-0.074mm accounts for 70% of extreme poverty Anshan type iron mine stone gross weight;
(2) rough Iron grade is mixed 31%; Magnetic field intensity during low intensity magnetic separation is 0.2T, and magnetic field intensity during high intensity magnetic separation is 0.8T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 15%, be then heated to 660 DEG C of insulation 40s, under being placed in reducing atmosphere condition, be incubated 10min, then air cooling is to lower than 50 DEG C, obtains magnet rough; The rough Iron grade of magnet is 34%; Reducing atmosphere is coal gas atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 30%, stir 10min, preliminary election controlling magnetic field intensity is 0.16T, and the Iron grade of rough concentrate is 63%;
(5) account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 1A, ascending current speed 15cm/s, obtains the concentrate product of Iron grade 67%, the rate of recovery 78% of iron.
Embodiment 3
Method is with embodiment 1, and difference is:
(1) Iron grade of extreme poverty Anshan type iron mine stone preliminary rejection is 20%; In Grading Overflow product, the part of granularity-0.074mm accounts for 75% of extreme poverty Anshan type iron mine stone gross weight;
(2) rough Iron grade is mixed 29%; Magnetic field intensity during low intensity magnetic separation is 0.2T, and magnetic field intensity during high intensity magnetic separation is 1.0T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 15%, be then heated to 630 DEG C of insulation 60s, under being placed in reducing atmosphere condition, be incubated 20min, then air cooling is to lower than 50 DEG C, obtains magnet rough; The rough Iron grade of magnet is 32%; Reducing atmosphere is hydrogen atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 35%, stir 20min, preliminary election controlling magnetic field intensity is 0.22T, and the Iron grade of rough concentrate is 62%;
(5) account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 1.5A, ascending current speed 20cm/s, obtains the concentrate product of Iron grade 66%, the rate of recovery 80% of iron.
Embodiment 4
Method is with embodiment 1, and difference is:
(1) Iron grade of extreme poverty Anshan type iron mine stone preliminary rejection is 18%; In Grading Overflow product, the part of granularity-0.074mm accounts for 80% of extreme poverty Anshan type iron mine stone gross weight;
(2) rough Iron grade is mixed 25%; Magnetic field intensity during low intensity magnetic separation is 0.3T, and magnetic field intensity during high intensity magnetic separation is 1.2T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 20%, be then heated to 600 DEG C of insulation 90s, under being placed in reducing atmosphere condition, be incubated 40min, then air cooling is to lower than 50 DEG C, obtains magnet rough; The rough Iron grade of magnet is 28%; Reducing atmosphere is coal gas atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 40%, stir 40min, preliminary election controlling magnetic field intensity is 0.25T, and the Iron grade of rough concentrate is 61%;
(5) account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 2A, ascending current speed 30cm/s, obtains the concentrate product of Iron grade 64%, the rate of recovery 80% of iron.
Embodiment 5
Method is with embodiment 1, and difference is:
(1) Iron grade of extreme poverty Anshan type iron mine stone preliminary rejection is 15%; In Grading Overflow product, the part of granularity-0.074mm accounts for 90% of extreme poverty Anshan type iron mine stone gross weight;
(2) rough Iron grade is mixed 20%; Magnetic field intensity during low intensity magnetic separation is 0.3T, and magnetic field intensity during high intensity magnetic separation is 1.5T;
(3) rough for mixing filtration is obtained water weight at the filter cake of 20%, be then heated to 580 DEG C of insulation 120s, under being placed in reducing atmosphere condition, be incubated 60min, then air cooling is to lower than 50 DEG C, obtains magnet rough; The rough Iron grade of magnet is 23%; Reducing atmosphere is coal gas atmosphere;
(4) rough for magnet adding water is made the ore pulp of weight concentration 40%, stir 40min, preliminary election controlling magnetic field intensity is 0.3T, and the Iron grade of rough concentrate is 60%;
(5) account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, the electric current of selected control electromagnetic refiner is 2A, ascending current speed 30cm/s, obtains the concentrate product of Iron grade 63%, the rate of recovery 80% of iron.
Claims (7)
1. a beneficiation method for Extremely lean iron ore preliminary rejection, is characterized in that carrying out according to the following steps:
(1) Extremely lean iron ore preliminary rejection is crushed to granularity≤15mm, put into the closed circuit grinding system that ball mill and cyclone form and carry out ore grinding process, the part obtaining granularity-0.074mm in Grading Overflow product accounts for 60 ~ 90% of Extremely lean iron ore gross weight; The Iron grade of described Extremely lean iron ore preliminary rejection is 15 ~ 25%;
(2) Grading Overflow product is carried out low intensity magnetic separation by weak magnetic separator, obtain low intensity magnetic separation concentrate and low intensity magnetic separation mine tailing, low intensity magnetic separation mine tailing is carried out high intensity magnetic separation by intensity magnetic separator, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing, high intensity magnetic separation concentrate and low intensity magnetic separation concentrate are merged as mixing rough;
(3) will mix rough filter obtain water weight 10 ~ 20% filter cake, then be heated to 580 ~ 700 DEG C of insulation 20 ~ 120s and remove moisture, make carbonate decomposition and preliminary election mixing rough middle iron content mineral convert bloodstone to, then 3 ~ 60min is incubated under being placed in reducing atmosphere condition, air cooling is to lower than 50 DEG C again, obtains magnet rough;
(4) rough for magnet adding water is made the ore pulp of weight concentration 25 ~ 40%, stir 5 ~ 40min and eliminate Electrostatic Absorption and reunion, then carry out preliminary election with drum magnetic separator, controlling magnetic field intensity is 0.11 ~ 0.3T, and the pre-concentrate selection of acquisition is as rough concentrate;
(5) account for more than 95% of rough concentrate gross weight by levigate for rough concentrate to granularity-400 object part, then carry out selected with electromagnetic refiner, the selected concentrate of acquisition filters removes moisture, obtains the concentrate product of Iron grade 63 ~ 68%.
2. the beneficiation method of a kind of Extremely lean iron ore preliminary rejection according to claim 1, when it is characterized in that carrying out selected with electromagnetic refiner, the electric current controlling electromagnetic refiner is 0.5 ~ 2A, ascending current speed 5 ~ 30cm/s.
3. the beneficiation method of a kind of Extremely lean iron ore preliminary rejection according to claim 1, is characterized in that the rate of recovery >=78% of iron.
4. the beneficiation method of a kind of Extremely lean iron ore preliminary rejection according to claim 1, is characterized in that the rough Iron grade of described mixing is 20 ~ 35%.
5. the beneficiation method of a kind of Extremely lean iron ore preliminary rejection according to claim 1, is characterized in that the rough Iron grade of described magnet is 23 ~ 38%.
6. the beneficiation method of a kind of Extremely lean iron ore preliminary rejection according to claim 1, is characterized in that the Iron grade of described rough concentrate is 60 ~ 63%.
7. the beneficiation method of a kind of Extremely lean iron ore preliminary rejection according to claim 1, magnetic field intensity when it is characterized in that low intensity magnetic separation in step (2) is 0.1 ~ 0.3T, and magnetic field intensity during high intensity magnetic separation is 0.8 ~ 1.5T.
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Cited By (5)
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| CN105435958A (en) * | 2015-12-10 | 2016-03-30 | 中国地质科学院矿产综合利用研究所 | Beneficiation and enrichment method for primary scandium ore |
| CN106076611A (en) * | 2016-05-12 | 2016-11-09 | 刘锡云 | Flowing grain powder eliminostatic magnetic separator |
| CN106269204A (en) * | 2016-08-17 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of energy saving technique processing extreme poverty bloodstone wet type pre-selecting rough concentrate |
| CN107252723A (en) * | 2017-06-16 | 2017-10-17 | 鞍钢集团矿业有限公司 | Composite ore high pressure roller mill wet type pre-selecting, suspension roasting magnetic separation process |
| CN108480035A (en) * | 2018-03-07 | 2018-09-04 | 鞍钢集团矿业有限公司 | A kind of method of pre-selection-roasting-magnetic separation process recycling magnetic tailing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105435958A (en) * | 2015-12-10 | 2016-03-30 | 中国地质科学院矿产综合利用研究所 | Beneficiation and enrichment method for primary scandium ore |
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| CN107252723A (en) * | 2017-06-16 | 2017-10-17 | 鞍钢集团矿业有限公司 | Composite ore high pressure roller mill wet type pre-selecting, suspension roasting magnetic separation process |
| CN108480035A (en) * | 2018-03-07 | 2018-09-04 | 鞍钢集团矿业有限公司 | A kind of method of pre-selection-roasting-magnetic separation process recycling magnetic tailing |
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