CN103861733A - Method for preparing super iron concentrates through magnetic separation-reverse flotation technology - Google Patents
Method for preparing super iron concentrates through magnetic separation-reverse flotation technology Download PDFInfo
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Abstract
The invention discloses a method for preparing super iron concentrates through magnetic separation-reverse flotation technology and belongs to the field of mine processing technologies. The method comprises the following steps: (1), adding water to iron concentrates to prepare iron concentrate pulp, carrying out pre-separation and magnetic separation by using an electromagnetic fine separator to obtain pre-separated concentrates; (2), classifying the pre-separated concentrates by a swirler to obtain overflows and underflows; (3) carrying out secondary magnetic separation by using a magnetic separator to obtain concentrates which are secondarily-separated concentrates; (4), thinning up the secondarily-separated concentrates, and then carrying out third magnetic separation by using the magnetic separator to obtain thirdly-separated concentrates; and (5), adjusting concentrations of the thirdly-separated concentrates, adding collectors into the thirdly-separated concentrates, placing in a reverse floatation device, carrying out reverse floatation and rough separation so as to obtain coarse ores, then adding cation collectors, and carrying out reverse floatation and fine separation so as to obtain the super iron concentrates. The method is low in comprehensive cost and high in recycling rate; the prepared super iron concentrates meet the requirements of powder metallurgy technologies; the large-scale industrial production can be easily realized.
Description
Technical field
The invention belongs to technical field of mineral processing, particularly a kind of magnetic separation-reverse flotation is prepared the method for extraction of superpure concentrate of magnetite.
Background technology
Extraction of superpure concentrate of magnetite refers to that concentrate iron grade reaches 71.5 ~ 72%, the iron ore concentrate that dioxide-containing silica is 0.1 ~ 0.3%.
The work of foreign study extraction of superpure concentrate of magnetite starts from the sixties in 20th century, because extraction of superpure concentrate of magnetite iron-holder is close to the theoretical value of minal, utilizes conventional beneficiating method directly to produce and have certain difficulty for this reason; The states such as the former Soviet Union, Canada, the U.S., Norway have successively done research, and have carried out the production of certain scale, and the extraction of superpure concentrate of magnetite iron grade of producing approaches 72%, and dioxide-containing silica is less than 0.5%; China just produces magnetic material with fine quality iron concentrate about the sixties in 20th century greatly, along with China increases the demand of extraction of superpure concentrate of magnetite, the producer that produces extraction of superpure concentrate of magnetite just constantly increases, and scale is also in continuous expansion, and production capacity develops into present several ten thousand tons by two or three initial kiloton; The fragrant iron ore of South China, Qidashan iron ore, Waitoushan iron ore etc. are successively successfully produced extraction of superpure concentrate of magnetite; But because extraction of superpure concentrate of magnetite is very harsh to the requirement of dioxide-containing silica, and fluctuation range requires strict, the extraction of superpure concentrate of magnetite of domestic production, no matter the quality of product and quantity all can not meet the requirement of industries concerned, need further to strengthen the research and development to extraction of superpure concentrate of magnetite.
In field of powder metallurgy, most of take iron scale as raw material, as made raw material direct-reduction with iron ore concentrate, require SiO in iron ore concentrate
2and other impurity content is very low, only have extraction of superpure concentrate of magnetite just can reach this requirement.In recent years, the reduced iron powder factory of West Europe, North America, Japan, employing extraction of superpure concentrate of magnetite is raw material, produces high performance iron powder.In China, owing to producing containing SiO
2and the lower extraction of superpure concentrate of magnetite of other impurity is more difficult, thereby the research in field of powder metallurgy application is few to it, adopts extraction of superpure concentrate of magnetite to do the producer of iron powder material also few.
Summary of the invention
The problems referred to above that exist in technology of preparing for existing extraction of superpure concentrate of magnetite, the invention provides a kind of magnetic separation-reverse flotation and prepare the method for extraction of superpure concentrate of magnetite, adopting common iron ore concentrate is raw material, by levigate again after preliminary election, then carry out magnetic separation and reverse flotation, prepare iron grade and dioxide-containing silica and meet the requirements of extraction of superpure concentrate of magnetite.
Method of the present invention is carried out according to the following steps:
1, the raw material adopting is the iron ore concentrate of grade 60 ~ 67%, adds water and makes the iron ore concentrate ore pulp of weight concentration 15 ~ 45%; Iron ore concentrate ore pulp is carried out to preliminary election magnetic separation with electromagnetic refiner, and magnetic field intensity when preliminary election magnetic separation is 100 ~ 500 oersteds, obtains pre-concentrate selection, grade 68 ~ 70%, weight concentration 40 ~ 60%;
2, pre-concentrate selection is passed through to cyclone classification, control feed force is 0.13 ~ 0.25MPa, the weight concentration 10 ~ 40% of the overflow that classification obtains, the weight concentration 65 ~ 75% of the underflow of acquisition;
3, the overflow that classification obtains adopts magnetic separator to carry out secondary magnetic separation, and magnetic field intensity when secondary magnetic separation is 1000 ~ 2000 oersteds, and the concentrate of acquisition is two concentrate selections, grade 69 ~ 71%, and weight concentration is 30 ~ 50%;
4, two concentrate selections are diluted with water to weight concentration 15 ~ 45%, then adopt magnetic separator to carry out three magnetic separation, magnetic field intensity when three magnetic separation is 100 ~ 500 oersteds, and the concentrate of acquisition is three concentrate selections, grade 70.5 ~ 71.2%;
5, three concentrate selections are added water and are adjusted to weight concentration 25 ~ 40%, add cation-collecting agent, addition is 30 ~ 120g/t, tri-concentrate selections, is then placed in reverse flotation equipment and carries out reverse flotation and roughly select, controlling the reverse flotation time of roughly selecting is 10 ~ 20min, and the concentrate of acquisition is for roughly selecting ore deposit; To roughly selecting, in ore deposit, to add cation-collecting agent, addition be that 30 ~ 120g/t roughly selects ore deposit, and being then placed in reverse flotation equipment, to carry out reverse flotation selected, and controlling the selected time of reverse flotation is 10 ~ 20min, and the concentrate of acquisition is extraction of superpure concentrate of magnetite.
Above-mentioned cation-collecting agent is lauryl amine or ether amine.
In above-mentioned iron ore concentrate, the part of granularity-0.074mm accounts for 60 ~ 90% of whole iron ore concentrate gross weights.
In above-mentioned iron ore concentrate, the weight content of FeO is 26 ~ 29%, SiO
2weight content be 4.5 ~ 5.8%.
Above-mentioned underflow is placed in to stir and grinds the levigate levigate ore deposit of making, and in levigate ore deposit, fineness-325 object part accounts for 90 ~ 99% of levigate ore deposit gross weight, then passes through cyclone classification after levigate ore deposit is mixed with pre-concentrate selection.
SiO in two above-mentioned concentrate selections
2weight content be 1 ~ 2%.
The above-mentioned grade of roughly selecting ore deposit 71.2 ~ 71.5%, SiO
2weight content be 0.1 ~ 0.3%.
The iron grade of above-mentioned extraction of superpure concentrate of magnetite is 71.5 ~ 72%, SiO
2weight content be 0.1 ~ 0.3%.
In said method, underflow is placed in and stirs mill when levigate, and the filling rate that stirs mill is 35 ~ 80%.
In said method, the overall recovery of the iron of extraction of superpure concentrate of magnetite is 65 ~ 85%.
The present invention adopts the raw material that magnetic susceptibility is relatively high, first carries out preliminary election magnetic separation, then levigate with stirring mill, then through twice magnetic separation, makes iron grade at 69 ~ 71%, SiO
2content is at 1 ~ 2% iron ore concentrate; After reverse flotation, further improve again iron grade and reduce SiO
2content, makes silica and acid non-soluble substance extraction of superpure concentrate of magnetite up to standard.Method synthesis cost of the present invention is low, and the rate of recovery is higher, and the extraction of superpure concentrate of magnetite of preparation meets the requirement of PM technique, is easy to realize large-scale industrial production.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram that the magnetic separation-reverse flotation of the embodiment of the present invention is prepared extraction of superpure concentrate of magnetite.
The specific embodiment
The electromagnetic refiner that in the embodiment of the present invention, magnetic separation adopts and the specification of magnetic separator are Φ 600mm.
The model of the stirring mill adopting in the embodiment of the present invention is TW-50, stirs the ball size of mill at 10 ~ 35mm.
The equipment that in the embodiment of the present invention, secondary magnetic separation adopts is wet type drum magnetic separator.
The cyclone that in the embodiment of the present invention, classification adopts is Φ 150mm hydrocyclone.
TFe 60 ~ 67wt% in the raw material iron ore concentrate adopting in the embodiment of the present invention, containing FeO 26 ~ 29 wt %, TiO
20.3 ~ 0.4 wt %, SiO
24.5 ~ 5.8wt %, Al
2o
30.5 ~ 1.2wt %, CaO 0.1 ~ 0.3 wt %, MgO 0.2 ~ 0.6 wt %, P≤0.02 wt %, S≤0.02wt %.
In the raw material iron ore concentrate adopting in the embodiment of the present invention, the chemical phase analysis result of iron is that iron in ferric carbonate accounts for 0.15 ~ 0.3wt %, iron in iron oxide accounts for 0.1 ~ 5wt %, iron in iron sulfide accounts for 0.1 ~ 0.2wt %, and the iron in ferrosilite accounts for 0.5 ~ 0.7wt %, and all the other are Armco magnetic iron.
The rate of recovery of embodiment of the present invention Raw iron ore concentrate iron after magnetic separation preliminary election, levigate and classification is 94 ~ 95%.
The lauryl amine adopting in the embodiment of the present invention and ether amine are commercial product.
Embodiment 1
The raw material adopting is the iron ore concentrate of grade 65%, and the part of granularity-0.074mm accounts for 80% of gross weight, and the weight content of FeO is 26%, SiO
2weight content be 5.8%;
Iron ore concentrate is added water and makes the iron ore concentrate ore pulp of weight concentration 15%; Carry out preliminary election magnetic separation, magnetic field intensity is 100 oersteds, obtains pre-concentrate selection, grade 68%, weight concentration 40%;
Pre-concentrate selection is carried out to classification by cyclone, and feed force is 0.13MPa, the weight concentration 10% of the overflow of acquisition, the weight concentration 65% of underflow;
Underflow is placed in to stir and grinds the levigate levigate ore deposit of making, in levigate ore deposit, fineness-325 object part accounts for 90% of levigate ore deposit gross weight, then passes through cyclone classification after levigate ore deposit is mixed with pre-concentrate selection;
Secondary magnetic separation is carried out in the overflow that classification obtains, and magnetic field intensity is 1000 oersteds, and the concentrate of acquisition is two concentrate selections, grade 69%, and weight concentration is 30%, SiO
2weight content be 1%; Underflow is placed in and stirs mill when levigate, and the filling rate that stirs mill is 35%;
Two concentrate selections are diluted with water to weight concentration 15%, then carry out three magnetic separation, magnetic field intensity is 100 oersteds, and the concentrate of acquisition is three concentrate selections, grade 71.0%;
Three concentrate selections are added water and are adjusted to weight concentration 30%, add cation-collecting agent lauryl amine, addition is 30g/t tri-concentrate selections, is then placed in reverse flotation equipment and carries out reverse flotation and roughly select, controlling the reverse flotation time of roughly selecting is 20min, and the concentrate of acquisition is for roughly selecting ore deposit; Roughly select the grade 71.3% in ore deposit, SiO
2weight content be 0.1%;
To roughly selecting, in ore deposit, to add cation-collecting agent lauryl amine, addition be that 30g/t roughly selects ore deposit, and being then placed in reverse flotation equipment, to carry out reverse flotation selected, and controlling the selected time of reverse flotation is 20min, and the concentrate of acquisition is extraction of superpure concentrate of magnetite; The iron grade of extraction of superpure concentrate of magnetite is 71.8%, SiO
2weight content be 0.1%; The overall recovery of iron is 85%.
Embodiment 2
The raw material adopting is the iron ore concentrate of grade 67%, and the part of granularity-0.074mm accounts for 90% of gross weight, and the weight content of FeO is 28%, SiO
2weight content be 4.5%;
Iron ore concentrate is added water and makes the iron ore concentrate ore pulp of weight concentration 25%; Carry out preliminary election magnetic separation, magnetic field intensity is 200 oersteds, obtains pre-concentrate selection, grade 69%, weight concentration 50%;
Pre-concentrate selection is carried out to classification by cyclone, and feed force is 0.16MPa, the weight concentration 20% of the overflow of acquisition, the weight concentration 68% of underflow;
Underflow is placed in to stir and grinds the levigate levigate ore deposit of making, in levigate ore deposit, fineness-325 object part accounts for 93% of levigate ore deposit gross weight, then passes through cyclone classification after levigate ore deposit is mixed with pre-concentrate selection;
Secondary magnetic separation is carried out in the overflow that classification obtains, and magnetic field intensity is 1500 oersteds, and the concentrate of acquisition is two concentrate selections, grade 69%, and weight concentration is 35%, SiO
2weight content be 2%; Underflow is placed in and stirs mill when levigate, and the filling rate that stirs mill is 40%;
Two concentrate selections are diluted with water to weight concentration 20%, then carry out three magnetic separation, magnetic field intensity is 200 oersteds, and the concentrate of acquisition is three concentrate selections, grade 70.8%;
Three concentrate selections are added water and are adjusted to weight concentration 25%, add cation-collecting agent ether amine, addition is 50g/t tri-concentrate selections, is then placed in reverse flotation equipment and carries out reverse flotation and roughly select, and controlling the reverse flotation time of roughly selecting is 15min, and the concentrate of acquisition is for roughly selecting ore deposit; Roughly select the grade 71.4% in ore deposit, SiO
2weight content be 0.2%;
To roughly selecting, in ore deposit, to add cation-collecting agent ether amine, addition be that 50g/t roughly selects ore deposit, and being then placed in reverse flotation equipment, to carry out reverse flotation selected, and controlling the selected time of reverse flotation is 15min, and the concentrate of acquisition is extraction of superpure concentrate of magnetite; The iron grade of extraction of superpure concentrate of magnetite is 71.9%, SiO
2weight content be 0.2%; The overall recovery of iron is 81%.
Embodiment 3
The raw material adopting is the iron ore concentrate of grade 60%, and the part of granularity-0.074mm accounts for 60% of gross weight, and the weight content of FeO is 29%, SiO
2weight content be 5.1%;
Iron ore concentrate is added water and makes the iron ore concentrate ore pulp of weight concentration 30%; Carry out preliminary election magnetic separation, magnetic field intensity is 300 oersteds, obtains pre-concentrate selection, grade 70%, weight concentration 60%;
Pre-concentrate selection is carried out to classification by cyclone, and feed force is 0.20MPa, the weight concentration 25% of the overflow of acquisition, the weight concentration 71% of underflow;
Underflow is placed in to stir and grinds the levigate levigate ore deposit of making, in levigate ore deposit, fineness-325 object part accounts for 94% of levigate ore deposit gross weight, then passes through cyclone classification after levigate ore deposit is mixed with pre-concentrate selection;
Secondary magnetic separation is carried out in the overflow that classification obtains, and magnetic field intensity is 2000 oersteds, and the concentrate of acquisition is two concentrate selections, grade 71%, and weight concentration is 40%, SiO
2weight content be 1.2%; Underflow is placed in and stirs mill when levigate, and the filling rate that stirs mill is 50%;
Two concentrate selections are diluted with water to weight concentration 25%, then carry out three magnetic separation, magnetic field intensity is 300 oersteds, and the concentrate of acquisition is three concentrate selections, grade 71.1%;
Three concentrate selections are added water and are adjusted to weight concentration 25%, add cation-collecting agent lauryl amine, addition is 80g/t tri-concentrate selections, is then placed in reverse flotation equipment and carries out reverse flotation and roughly select, controlling the reverse flotation time of roughly selecting is 15min, and the concentrate of acquisition is for roughly selecting ore deposit; Roughly select the grade 71.4% in ore deposit, SiO
2weight content be 0.3%;
To roughly selecting, in ore deposit, to add cation-collecting agent lauryl amine, addition be that 80g/t roughly selects ore deposit, and being then placed in reverse flotation equipment, to carry out reverse flotation selected, and controlling the selected time of reverse flotation is 15min, and the concentrate of acquisition is extraction of superpure concentrate of magnetite; The iron grade of extraction of superpure concentrate of magnetite is 72%, SiO
2weight content be 0.3%; The overall recovery of iron is 76%.
Embodiment 4
The raw material adopting is the iron ore concentrate of grade 63%, and the part of granularity-0.074mm accounts for 70% of gross weight, and the weight content of FeO is 26%, SiO
2weight content be 4.8%;
Iron ore concentrate is added water and makes the iron ore concentrate ore pulp of weight concentration 35%; Carry out preliminary election magnetic separation, magnetic field intensity is 400 oersteds, obtains pre-concentrate selection, grade 68%, weight concentration 55%;
Pre-concentrate selection is carried out to classification by cyclone, and feed force is 0.25MPa, the weight concentration 30% of the overflow of acquisition, the weight concentration 73% of underflow;
Underflow is placed in to stir and grinds the levigate levigate ore deposit of making, in levigate ore deposit, fineness-325 object part accounts for 95% of levigate ore deposit gross weight, then passes through cyclone classification after levigate ore deposit is mixed with pre-concentrate selection;
Secondary magnetic separation is carried out in the overflow that classification obtains, and magnetic field intensity is 1000 oersteds, and the concentrate of acquisition is two concentrate selections, grade 69%, and weight concentration is 45%, SiO
2weight content be 1.6%; Underflow is placed in and stirs mill when levigate, and the filling rate that stirs mill is 60%;
Two concentrate selections are diluted with water to weight concentration 35%, then carry out three magnetic separation, magnetic field intensity is 400 oersteds, and the concentrate of acquisition is three concentrate selections, grade 70.5%;
Three concentrate selections are added water and are adjusted to weight concentration 30%, add cation-collecting agent ether amine, addition is 100g/t tri-concentrate selections, is then placed in reverse flotation equipment and carries out reverse flotation and roughly select, and controlling the reverse flotation time of roughly selecting is 15min, and the concentrate of acquisition is for roughly selecting ore deposit; Roughly select the grade 71.2% in ore deposit, SiO
2weight content be 0.2%;
To roughly selecting, in ore deposit, to add cation-collecting agent ether amine, addition be that 100g/t roughly selects ore deposit, and being then placed in reverse flotation equipment, to carry out reverse flotation selected, and controlling the selected time of reverse flotation is 15min, and the concentrate of acquisition is extraction of superpure concentrate of magnetite; The iron grade of extraction of superpure concentrate of magnetite is 71.5%, SiO
2weight content be 0.2%; The overall recovery of iron is 70%.
Embodiment 5
The raw material adopting is the iron ore concentrate of grade 66%, and the part of granularity-0.074mm accounts for 75% of gross weight, and the weight content of FeO is 29%, SiO
2weight content be 5.3%;
Iron ore concentrate is added water and makes the iron ore concentrate ore pulp of weight concentration 45%; Carry out preliminary election magnetic separation, magnetic field intensity is 500 oersteds, obtains pre-concentrate selection, grade 70%, weight concentration 45%;
Pre-concentrate selection is carried out to classification by cyclone, and feed force is 0.20MPa, the weight concentration 40% of the overflow of acquisition, the weight concentration 75% of underflow;
Underflow is placed in to stir and grinds the levigate levigate ore deposit of making, in levigate ore deposit, fineness-325 object part accounts for 90% of levigate ore deposit gross weight, then passes through cyclone classification after levigate ore deposit is mixed with pre-concentrate selection;
Secondary magnetic separation is carried out in the overflow that classification obtains, and magnetic field intensity is 2000 oersteds, and the concentrate of acquisition is two concentrate selections, grade 71%, and weight concentration is 50%, SiO
2weight content be 1.8%; Underflow is placed in and stirs mill when levigate, and the filling rate that stirs mill is 80%;
Two concentrate selections are diluted with water to weight concentration 45%, then carry out three magnetic separation, magnetic field intensity is 500 oersteds, and the concentrate of acquisition is three concentrate selections, grade 71.2%;
Three concentrate selections are added water and are adjusted to weight concentration 40%, add cation-collecting agent lauryl amine, addition is 120g/t tri-concentrate selections, is then placed in reverse flotation equipment and carries out reverse flotation and roughly select, controlling the reverse flotation time of roughly selecting is 10min, and the concentrate of acquisition is for roughly selecting ore deposit; Roughly select the grade 71.5% in ore deposit, SiO
2weight content be 0.1%;
To roughly selecting, in ore deposit, to add cation-collecting agent lauryl amine amine, addition be that 120g/t roughly selects ore deposit, and being then placed in reverse flotation equipment, to carry out reverse flotation selected, and controlling the selected time of reverse flotation is 10min, and the concentrate of acquisition is extraction of superpure concentrate of magnetite; The iron grade of extraction of superpure concentrate of magnetite is 72%, SiO
2weight content be 0.1%; The overall recovery of iron is 65%.
Claims (6)
1. magnetic separation-reverse flotation is prepared a method for extraction of superpure concentrate of magnetite, it is characterized in that carrying out according to the following steps:
(1) raw material adopting is the iron ore concentrate of grade 60 ~ 67%, adds water and makes the iron ore concentrate ore pulp of weight concentration 15 ~ 45%; Iron ore concentrate ore pulp is carried out to preliminary election magnetic separation with electromagnetic refiner, and magnetic field intensity when preliminary election magnetic separation is 100 ~ 500 oersteds, obtains pre-concentrate selection, grade 68 ~ 70%, weight concentration 40 ~ 60%;
(2) pre-concentrate selection is passed through to cyclone classification, control feed force is 0.13 ~ 0.25MPa, the weight concentration 10 ~ 40% of the overflow that classification obtains, the weight concentration 65 ~ 75% of the underflow of acquisition;
(3) overflow that classification obtains adopts magnetic separator to carry out secondary magnetic separation, and magnetic field intensity when secondary magnetic separation is 1000 ~ 2000 oersteds, and the concentrate of acquisition is two concentrate selections, grade 69 ~ 71%, and weight concentration is 30 ~ 50%;
(4) two concentrate selections are diluted with water to weight concentration 15 ~ 45%, then adopt magnetic separator to carry out three magnetic separation, magnetic field intensity when three magnetic separation is 100 ~ 500 oersteds, and the concentrate of acquisition is three concentrate selections, grade 70.5 ~ 71.2%;
(5) three concentrate selections are added water and are adjusted to weight concentration 25 ~ 40%, add cation-collecting agent, addition is 30 ~ 120g/t, tri-concentrate selections, is then placed in reverse flotation equipment and carries out reverse flotation and roughly select, controlling the reverse flotation time of roughly selecting is 10 ~ 20min, and the concentrate of acquisition is for roughly selecting ore deposit; To roughly selecting, in ore deposit, to add cation-collecting agent, addition be that 30 ~ 120g/t roughly selects ore deposit, and being then placed in reverse flotation equipment, to carry out reverse flotation selected, and controlling the selected time of reverse flotation is 10 ~ 20min, and the concentrate of acquisition is extraction of superpure concentrate of magnetite.
2. a kind of magnetic separation-reverse flotation according to claim 1 is prepared the method for extraction of superpure concentrate of magnetite, it is characterized in that described cation-collecting agent is lauryl amine or ether amine.
3. a kind of magnetic separation-reverse flotation according to claim 1 is prepared the method for extraction of superpure concentrate of magnetite, it is characterized in that the part of granularity-0.074mm in described iron ore concentrate accounts for 60 ~ 90% of whole iron ore concentrate gross weights.
4. a kind of magnetic separation-reverse flotation according to claim 1 is prepared the method for extraction of superpure concentrate of magnetite, it is characterized in that the weight content of FeO in described iron ore concentrate is 26 ~ 29%, SiO
2weight content be 4.5 ~ 5.8%.
5. a kind of magnetic separation-reverse flotation according to claim 1 is prepared the method for extraction of superpure concentrate of magnetite, it is characterized in that the iron grade of described extraction of superpure concentrate of magnetite is 71.5 ~ 72%, SiO
2weight content be 0.1 ~ 0.3%.
6. a kind of magnetic separation-reverse flotation according to claim 1 is prepared the method for extraction of superpure concentrate of magnetite, it is characterized in that underflow to be placed in to stir to grind the levigate levigate ore deposit of making, in levigate ore deposit, fineness-325 object part accounts for 90 ~ 99% of levigate ore deposit gross weight, then passes through cyclone classification after levigate ore deposit is mixed with pre-concentrate selection.
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| CN105063264A (en) * | 2015-09-02 | 2015-11-18 | 东北大学 | Method for preparing pure iron |
| CN106269212A (en) * | 2016-10-14 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of magnetic separation grading system is for the method for extraction of superpure concentrate of magnetite |
| CN107271438A (en) * | 2017-06-01 | 2017-10-20 | 东北大学 | A kind of common iron ore concentrate prepares the decision method of extraction of superpure concentrate of magnetite feasibility |
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