CN103551247B - Iron removal of impurities ore-dressing technique is put forward in a kind of limonite reduction roasting - Google Patents
Iron removal of impurities ore-dressing technique is put forward in a kind of limonite reduction roasting Download PDFInfo
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- CN103551247B CN103551247B CN201310521087.2A CN201310521087A CN103551247B CN 103551247 B CN103551247 B CN 103551247B CN 201310521087 A CN201310521087 A CN 201310521087A CN 103551247 B CN103551247 B CN 103551247B
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Abstract
The present invention relates to a kind of limonite reduction roasting and put forward iron removal of impurities ore-dressing technique, it is characterized in that: comprising: the shrend of raw material preparation, agglomeration, dry process, reduction roasting and roasting material, screening wet type pre-selecting, stage grinding are separated with magnetic separation, above-mentioned limonite reduction roasting is adopted to put forward iron removal of impurities ore-dressing technique, degree of metalization 90% ~ 95%, the rate of recovery of iron reaches 90% ~ 95%, and the mine tailing of grade 5% ~ 10% is true tailings.
Description
Technical field
The invention belongs to technical field of mineral processing, be specifically related to a kind of limonite reduction roasting and put forward iron removal of impurities ore-dressing technique.
Background technology
Limonite especially Indonesia's limonite is oxidizing aqueous ore deposit, by what generate after other ore weathering, distributes the most extensive at occurring in nature, but large actually rare of mineral deposit reserve.Limonite is actually by goethite (Fe
2o
3h
2o), liquid drugs injection iron ore (2Fe
2o
3h
2o) and containing the iron oxide of the different crystallization water and the mixture of shale material form.In limonite, most iron-bearing mineral is with 2Fe
2o
3h
2o form exists.General limonite ore iron-holder is 37% ~ 55%, sometimes phosphorous higher.The water imbibition of limonite is very strong, generally all adsorbs a large amount of moisture, and in roasting or enter after blast furnace is heated to remove free water and the crystallization water, thus the ore porosity increases, and substantially improves the reproducibility of ore.So limonite is all better than the reproducibility of bloodstone and magnetic iron ore.Meanwhile, the iron-holder of ore is correspondingly improve owing to eliminating moisture.
Indonesia's limonite ore is a kind of weak-magnetic iron ore, and beneficiation method used is more, comprises gravity treatment, flotation, and high intensity magnetic separation etc. and several method are combined and sorted, and sort final concentrate grade always not high.In recent years, along with the application of equipment enlarging and novel floating agent, Limonite processing factory generally applies the combined process flow that existing parallel connection has again tandem compound, but combined process flow complex structure, sorts requirement many, and operating condition is more, on-the-spot wayward, concentrate grade is not high.Such as certain selects factory and office to manage limonite, when grinding particle size is-0.074mm85%, adopt sodium carbonate and waterglass dispersion ore pulp, adopt the high intensity magnetic separation process flow process of one roughing (field intensity is 12000 oersteds), once purging selection (field intensity is 11000 oersteds), twice selected (field intensity is 10000 oersteds), finally only obtain the low-grade iron ore concentrate of Iron grade 54.12%, iron recovery 62.16%.
Summary of the invention
The object of this invention is to provide the limonite reduction roasting of a kind of Indonesia and put forward iron removal of impurities ore-dressing technique.In order to utilize Indonesia's limonite resource, solve Limonite processing flow process in producing at present complicated, operating condition is many, is difficult to sort, and concentrate Iron grade is low, the problem that production cost is high, alleviates the contradiction existed in the utilization of resources.
The technical problem to be solved in the present invention is realized by following technical scheme.
Iron removal of impurities ore-dressing technique is put forward according to limonite reduction roasting of the present invention, it is characterized in that: comprising: the shrend of raw material preparation, agglomeration, dry process, reduction roasting and roasting material, screening wet type pre-selecting, stage grinding are separated with magnetic separation, and its processing step is as follows:
(1) raw material preparation, agglomeration:
After the limonite of TFe35% ~ 50% is carried out break process, with coal dust, binding agent and additive mixing agglomeration, wherein: binding agent is tapioca, additive is the mixture of calcium oxide, sodium carbonate and sodium sulphate, its calcium oxide, sodium carbonate, sodium sulphate percentage by weight is 30%: 30%: 40%, the raw materials by weight of mixing agglomeration: limonite 85% ~ 96.0%, bituminous coal amount 0.5% ~ 15.0%, binding agent 0.5% ~ 4.0%, additive capacity 0.5% ~ 8.0%;
(2) dry process: dryer is put in the mixing agglomeration in step (1), at 250 DEG C ~ 400 DEG C temperature, dry 5-7 minute;
(3) shrend of reduction roasting and roasting material:
Put in roasting tunnel kiln by the material of step (2) drying process post-drying, carry out reduction roasting 6 ~ 7 hours at 950 DEG C ~ 1000 DEG C, then shrend, is cooled to room temperature;
(4) wet type pre-selecting is sieved:
Step (3) cooled material is sieved, its sieve diameter is 10 millimeters, after screening, on-the-sieve material feeds below crusher in crushing to 10 millimeter and then enters wet type pre-selecting magnetic separator and carry out magnetic separation, magnetic field intensity is 800 ~ 1200 oersteds, undersize material wet magnetic separator tailings discarding by preconcentration, obtained grade is the concentrate of more than 45%; Abandon productive rate 15% ~ 20%, the mine tailing of Iron grade 5% ~ 10%;
(5) magnetic separation separating reducing product:
The concentrate that step (4) is obtained is fed ball mill and carries out one section of wet grinding process, one section of wet grinding granularity is the material of-0.074mm50%, feed one section of permanent-magnet drum type magnetic separator and carry out magnetic separation, its magnetic field intensity is 1800 ~ 2200 oersteds, and the magnetic concentrate of one section permanent-magnet drum type magnetic separator feeds two sections of ball mills again;
Secondary grinding granularity is the material of-0.074mm70 ~ 85%, and feed two sections of permanent-magnet drum type magnetic separators and select, its magnetic field intensity is 1400 ~ 1600 oersteds;
The concentrate of two sections of permanent-magnet drum type magnetic separators feeds vertical tower grinding machine, be milled to granularity accounts for 85% ~ 95% material at-0.074mm, then, feed wash mill magnetic separation to be separated, its wash mill ascending current speed is 350 ~ 500 milliliters/second, its magnetic field intensity 12000 ~ 14000 oersted, the isolated material of wash mill magnetic separation iron content 90% ~ 94% by weight percentage, degree of metalization 90% ~ 95%, the concentrate of the rate of recovery 90% ~ 95% of iron is final concentrate, and the mine tailing of grade 5% ~ 10% is true tailings.
The magnetic field intensity of described wet type pre-selecting magnetic separator is 1000 oersteds,
The magnetic field intensity of one section of described permanent-magnet drum type magnetic separator is 2000 oersteds,
The magnetic field intensity of two sections of described permanent-magnet drum type magnetic separators is 1500 oersteds.
Add calcium oxide in the present invention, sodium carbonate, sodium sulphate is that can effectively to solve limonite sintering temperature high, and the problem that roasting time is long can also increase iron crystalline particle.
The present invention has the following advantages compared with limonite dressing method in the past:
1, adopt limonite reduction roasting of the present invention to put forward iron removal of impurities ore-dressing technique, the iron material concentrate grade produced is high, and the degree of metalization of iron material is high, and the rate of recovery is high;
2, shrend of the present invention adopts screening, and wet type pre-selecting abandons 15% ~ 25% qualified tailings, reduces grinding machine and enters mill amount, reduce ore grinding cost;
3, the present invention adopts the granularity of ball mill and vertical tower grinding machine process integration guarantee preliminary election material at-200 orders 90%;
4, the present invention continues to sort with wash mill after two stages of magnetic separation, can obtain iron content more than 90% high grade iron material by weight percentage like this.
Accompanying drawing explanation
Fig. 1 is process chart of the present invention.
Detailed description of the invention
Referring to drawings and Examples, the present invention is further illustrated.
embodiment 1
The main chemical compositions of the Indonesia's limonite handled by the present invention is: TFe42.0%, agglomeration compound pulp furnish: Indonesia's limonite 92.0%, coal dust 5.0%, binding agent tapioca 1%, additive 2.0%, additive is calcium oxide, sodium carbonate and sodium sulphate mixture, calcium oxide, sodium carbonate, sodium sulphate percentage by weight is 30%: 30%: 40%.Mix after break process, agglomeration, put on dryer, dry 7min at the temperature of 250 DEG C, then the material after drying process is entered tunnel kiln reduction roasting, sintering temperature is 1000 DEG C, 6 hours high-temperature roasting time, after roasting terminates, product is cooled in shrend, screening, sieve diameter is 10 millimeters, undersize wet type pre-selecting, oversize is wet type pre-selecting below crusher in crushing to 10 millimeter, productive rate 17.33% is abandoned in preliminary election, the mine tailing of Iron grade 6.96%, the concentrate of wet type pre-selecting magnetic separator preliminary election is fed ball mill and carries out one section of wet grinding process, primary grinding granularity is that the product of-0.074mm48% feeds one section of permanent-magnet drum type magnetic separator and carries out magnetic separation, the magnetic concentrate of its permanent-magnet drum type magnetic separator feeds two sections of ball mills again, secondary grinding granularity is that the product of-0.074mm75% feeds two sections of permanent-magnet drum type magnetic separators and selects, two stages of magnetic separation concentrate feed vertical tower grinding machine and are milled to granularity-0.074mm and account for more than 90%, vertical tower mill product feeds wash mill magnetic separation and is separated, its wash mill ascending current speed is 350 milliliters/second, field intensity 12000 oersted, iron material iron content 91% by weight percentage after wash mill magnetic separation is separated, degree of metalization 91.5%, the concentrate of the rate of recovery 90% of iron is final concentrate, the mine tailing of Iron grade 7.5% is true tailings.
embodiment 2
The main chemical compositions of the Indonesia's limonite handled by the present invention is: TFe45.0%, agglomeration compound pulp furnish: Indonesia's limonite 81.0%, coal dust 13.0%, binding agent tapioca 4%, additive 2.0%, described additive is calcium oxide, sodium carbonate and sodium sulphate mixture, and its calcium oxide, sodium carbonate and sodium sulphate percentage by weight are 30%: 30%: 40%).Mix after break process, agglomeration, put on dryer, dry 6min at the temperature of 300 DEG C, then the material after drying process is carried out reduction roasting, sintering temperature is 1100 DEG C, 5 hours high-temperature roasting time, reduction roasting terminates rear shrend cooling, sieve again, the sieve diameter of its its wet type pre-selecting sieve is 10 millimeters, undersize wet type pre-selecting oversize is wet type pre-selecting below crusher in crushing to 10 millimeter, wet type pre-selecting abandons productive rate 20.45%, the qualified tailings of Iron grade 7.88%, the concentrate of wet type pre-selecting magnetic separator preliminary election is fed ball mill and carries out one section of wet grinding process, primary grinding granularity is that the product of-0.074mm50% feeds one section of permanent-magnet drum type magnetic separator and carries out magnetic separation, the magnetic concentrate of its permanent-magnet drum type magnetic separator feeds two sections of ball mills again, secondary grinding granularity is that the product of-0.074mm80% feeds two sections of permanent-magnet drum type magnetic separators and selects, two stages of magnetic separation concentrate feed vertical tower grinding machine and are milled to granularity-0.074mm and account for 91%, vertical tower mill product feeds wash mill magnetic separation and is separated, its wash mill ascending current speed is 400 milliliters/second, field intensity 13000 oersted, iron material iron content 91.5% by weight percentage after wash mill magnetic separation is separated, degree of metalization 92%, the concentrate of the rate of recovery 93% of iron is final concentrate, the mine tailing of Iron grade 8.4% is true tailings.
embodiment 3
The main chemical compositions of the Indonesia's limonite handled by the present invention is: TFe50.0%, agglomeration compound pulp furnish: Indonesia's height alumolimonite 90.0%, coal dust 7.0%, glue and add agent tapioca 2.0%, add knot agent 1.0%, described additive is calcium oxide, sodium carbonate and sodium sulphate mixture, its calcium oxide, sodium carbonate, sodium sulphate percentage by weight is 30%: 30%: 40%, mix after break process, agglomeration, put on dryer, dry 5min at the temperature of 380 DEG C, then the material after drying process is carried out roasting, sintering temperature is 900 DEG C, 6 hours high-temperature roasting time, roasting terminates rear shrend cooling, screening: the sieve diameter of its wet type pre-selecting sieve is 10 millimeters, undersize wet type pre-selecting oversize is wet type pre-selecting below crusher in crushing to 10 millimeter, wet type pre-selecting abandons productive rate 16.45%, the qualified tailings of Iron grade 8.18%, the concentrate of wet type pre-selecting magnetic separator preliminary election is fed ball mill and carries out one section of wet grinding process, primary grinding granularity is that the product of-0.074mm54% feeds one section of permanent-magnet drum type magnetic separator and carries out magnetic separation, the magnetic concentrate of its permanent-magnet drum type magnetic separator feeds two sections of ball mills again, secondary grinding granularity is that the product of-0.074mm82.5% feeds two sections of permanent-magnet drum type magnetic separators and selects, two stages of magnetic separation concentrate feed vertical tower grinding machine and are milled to granularity-0.074mm and account for 90.5%, vertical tower mill product feeds wash mill magnetic separation and is separated, its wash mill ascending current speed is 450 milliliters/second, field intensity 13500 oersted, iron material iron content 92.5% by weight percentage after wash mill magnetic separation is separated, degree of metalization 93.5%, the concentrate of the rate of recovery 94.2% of iron is final concentrate, the mine tailing of Iron grade 7.8% is true tailings.
Claims (3)
1. an iron removal of impurities ore-dressing technique is put forward in limonite reduction roasting, it is characterized in that: comprising: the shrend of raw material preparation, agglomeration, dry process, reduction roasting and roasting material, screening wet type pre-selecting, stage grinding are separated with magnetic separation, and its processing step is as follows:
(1) raw material preparation, agglomeration:
After the limonite of TFe35% ~ 50% is carried out break process, with coal dust, binding agent and additive mixing agglomeration, wherein: binding agent is tapioca, additive is the mixture of calcium oxide, sodium carbonate and sodium sulphate, its calcium oxide, sodium carbonate, sodium sulphate percentage by weight is 30%: 30%: 40%, the raw materials by weight of mixing agglomeration: limonite 85% ~ 96.0%, bituminous coal amount 0.5% ~ 15.0%, binding agent 0.5% ~ 4.0%, additive capacity 0.5% ~ 8.0%;
(2) dry process: dryer is put in the mixing agglomeration in step (1), at 250 DEG C ~ 400 DEG C temperature, dry 5 minutes;
(3) shrend of reduction roasting and roasting material:
Put in roasting tunnel kiln by the material of step (2) drying process post-drying, carry out reduction roasting 6 ~ 7 hours at 950 DEG C ~ 1000 DEG C, then shrend, is cooled to room temperature;
(4) wet type pre-selecting is sieved:
Step (3) cooled material is sieved, its sieve diameter is 10 millimeters, after screening, on-the-sieve material feeds below crusher in crushing to 10 millimeter and then enters wet type pre-selecting magnetic separator and carry out magnetic separation, magnetic field intensity is 800 ~ 1200 oersteds, undersize material wet magnetic separator tailings discarding by preconcentration, obtained grade is the concentrate of more than 45%; Abandon productive rate 15% ~ 20%, the mine tailing of Iron grade 5% ~ 10%;
(5) magnetic separation separating reducing product:
The concentrate that step (4) is obtained is fed ball mill and carries out one section of wet grinding process, one section of wet grinding granularity is the material of-0.074mm50%, feed one section of permanent-magnet drum type magnetic separator and carry out magnetic separation, its magnetic field intensity is 1800 ~ 2200 oersteds, and the magnetic concentrate of one section permanent-magnet drum type magnetic separator feeds two sections of ball mills again;
Secondary grinding granularity is the material of-0.074mm70 ~ 85%, and feed two sections of permanent-magnet drum type magnetic separators and select, its magnetic field intensity is 1400 ~ 1600 oersteds;
The concentrate of two sections of permanent-magnet drum type magnetic separators feeds vertical tower grinding machine, be milled to granularity accounts for 85% ~ 95% material at-0.074mm, then, feed wash mill magnetic separation to be separated, its wash mill ascending current speed is 350 ~ 500 milliliters/second, its magnetic field intensity 12000 ~ 14000 oersted, the isolated material of wash mill magnetic separation iron content 90% ~ 94% by weight percentage, degree of metalization 90% ~ 95%, the concentrate of the rate of recovery 90% ~ 95% of iron is final concentrate, and the mine tailing of grade 5% ~ 10% is true tailings.
2. iron removal of impurities ore-dressing technique is put forward in a kind of limonite reduction roasting according to claim 1, it is characterized in that the magnetic field intensity of described wet type pre-selecting magnetic separator is 1000 oersteds.
3. iron removal of impurities ore-dressing technique is put forward in a kind of limonite reduction roasting according to claim 1, it is characterized in that the magnetic field intensity of one section of described permanent-magnet drum type magnetic separator is 2000 oersteds, the magnetic field intensity of two sections of described permanent-magnet drum type magnetic separators is 1500 oersteds.
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| CN104451124A (en) * | 2014-11-17 | 2015-03-25 | 长沙有色冶金设计研究院有限公司 | Method for iron increase and dephosphorization of low-grade high-phosphorus oolitic hematite |
| US20160376681A1 (en) * | 2015-06-26 | 2016-12-29 | Vale S.A. | Process to thermally upgrade metal-containing limonite or saprolite ores via magnetic separation and the use of the magnetic concentrate as seeds |
| CN105170285B (en) * | 2015-09-24 | 2017-06-27 | 中冶北方（大连）工程技术有限公司 | A kind of amphibole type oxide ore reduction roasting carries iron and drops miscellaneous ore-dressing technique |
| 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 |
| CN110314763B (en) * | 2019-07-25 | 2021-09-21 | 中南大学 | Method for preparing pellet raw material by using fine ore |
| CN112791850A (en) * | 2020-11-30 | 2021-05-14 | 河北钢铁集团矿业有限公司 | Grading and pre-selecting method for hematite |
| CN115183564B (en) * | 2021-04-02 | 2023-12-29 | 中冶长天国际工程有限责任公司 | Block ore pretreatment system and method based on distribution plate |
| CN113457834A (en) * | 2021-06-30 | 2021-10-01 | 中冶北方（大连）工程技术有限公司 | Mineral processing technology for recovering high-grade iron ore concentrate from copper tailings |
| CN114160304A (en) * | 2021-12-02 | 2022-03-11 | 华筑绿建(北京)科技有限公司 | Raw ore iron removal process |
| CN115020659B (en) * | 2022-01-21 | 2023-04-18 | 昆明理工大学 | LiFePO 4 Preparation method of/C composite positive electrode material |
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| CN101348860A (en) * | 2008-09-01 | 2009-01-21 | 武汉理工大学 | Production method of porous active magnetite |
| CN101428248A (en) * | 2008-11-04 | 2009-05-13 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation method for recycling specularite |
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| US20070039894A1 (en) * | 2005-08-17 | 2007-02-22 | Cort Steven L | Water treatment using magnetic and other field separation technologies |
| JP2009221530A (en) * | 2008-03-14 | 2009-10-01 | Yoshinosuke Shoji | Method for shifting metal iron and titanium oxide raw material |
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| CN101348860A (en) * | 2008-09-01 | 2009-01-21 | 武汉理工大学 | Production method of porous active magnetite |
| CN101428248A (en) * | 2008-11-04 | 2009-05-13 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation method for recycling specularite |
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