CN113604659A - Method for magnetizing and roasting iron tailings by biomass - Google Patents
Method for magnetizing and roasting iron tailings by biomass Download PDFInfo
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- CN113604659A CN113604659A CN202110926927.8A CN202110926927A CN113604659A CN 113604659 A CN113604659 A CN 113604659A CN 202110926927 A CN202110926927 A CN 202110926927A CN 113604659 A CN113604659 A CN 113604659A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 229
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 113
- 239000002028 Biomass Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 49
- 239000000843 powder Substances 0.000 claims abstract description 42
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000012141 concentrate Substances 0.000 claims abstract description 21
- 238000007885 magnetic separation Methods 0.000 claims abstract description 21
- 238000000227 grinding Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 230000005415 magnetization Effects 0.000 claims abstract description 4
- 239000002023 wood Substances 0.000 claims description 16
- 230000006698 induction Effects 0.000 claims description 6
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 4
- 235000011613 Pinus brutia Nutrition 0.000 claims description 4
- 241000018646 Pinus brutia Species 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241000218645 Cedrus Species 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 244000082204 Phyllostachys viridis Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000012298 atmosphere Substances 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 244000166124 Eucalyptus globulus Species 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 17
- 239000007789 gas Substances 0.000 abstract description 8
- 238000000197 pyrolysis Methods 0.000 abstract description 8
- 229910052595 hematite Inorganic materials 0.000 abstract description 5
- 239000011019 hematite Substances 0.000 abstract description 5
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000005054 agglomeration Methods 0.000 abstract description 4
- 230000002776 aggregation Effects 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 4
- 229910052710 silicon Inorganic materials 0.000 abstract description 4
- 239000010703 silicon Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 16
- 241000219927 Eucalyptus Species 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000001035 drying Methods 0.000 description 8
- 241000196324 Embryophyta Species 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 229910052573 porcelain Inorganic materials 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000002803 fossil fuel Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- 229910001608 iron mineral Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910021646 siderite Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- YONPGGFAJWQGJC-UHFFFAOYSA-K titanium(iii) chloride Chemical compound Cl[Ti](Cl)Cl YONPGGFAJWQGJC-UHFFFAOYSA-K 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
-
- 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
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a method for magnetizing and roasting iron tailings by biomass. Firstly, crushing and grinding iron tailings to-0.074 mm to obtain iron tailing powder; crushing the biomass to obtain biomass powder; separately placing the iron tailing powder and the biomass powder at different parts in the same heat-resistant closed container, and carrying out magnetization roasting at the temperature of 600-750 ℃; and finally, cooling, grinding and magnetically separating the roasted iron tailing powder to obtain magnetite concentrate. The invention utilizes H generated by biomass pyrolysis2Reducing gases such as CO convert weakly magnetic oxides such as hematite and the like in the iron tailings into strongly magnetic magnetite, biomass and the iron tailings are roasted separately to prevent agglomeration, and impurities such as silicon, aluminum and the like are removed by adopting processes such as grinding and magnetic separation, so that the iron grade and the iron recovery rate of the magnetite concentrate are effectively improved.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization. More particularly, relates to a method for magnetizing and roasting iron tailings by biomass.
Background
In recent years, the supply of iron ore is increasingly tense in the world, the price of the iron ore is greatly increased, and the accumulated stock of iron tailings in China exceeds 50 hundred million tons and contains a large amount of recyclable iron resources. The existing common method for recovering iron resources by magnetizing roasting is a method for converting weak magnetic iron minerals (such as hematite, limonite, siderite, pyrite and the like) into strong magnetic iron ores and separating the strong magnetic iron minerals from gangue minerals by separation technologies such as weak magnetic separation and the like so as to obtain iron ore concentrates. The magnetizing roasting of low-grade weak magnetic iron ore is a reasonable and effective comprehensive utilization or recovery process of iron resources, and has positive effects on reasonable utilization of natural resources and ecological environment protection.
Natural plant biomass has the advantages of universality, richness, reproducibility and the like, mainly comprises carbon, hydrogen and oxygen, has low content of nitrogen, sulfur and ash, and can generate H by pyrolysis2、CO、CO2、CH4And a plurality of gases, among which H2、CO、CH4All have stronger reducibility and can be used for reducing roasting of the iron tailings. Therefore, natural plant biomass is used for replacing fossil energy, and greenhouse gas CO generated by burning biomass can be reduced2Can also reduce SO generated by using fossil fuel2And NOxAnd the like. In addition, natural plant biomass belongs to carbon neutral substance, and CO generated by complete combustion2And CO absorption during the growth process2The amount is the same, so the natural plant biomass is often considered as clean energy, and the comprehensive utilization of the natural plant biomass can be beneficial to carbon emission reduction.
For example, patent CN201010034534.8 discloses a method for producing iron ore concentrate by magnetizing and reducing limonite and biomass, which pulverizes the limonite and the biomass, mixes them uniformly, and then calcines them, so as to reduce the limonite into magnetic iron oxide, and then performs magnetic separation to obtain iron ore concentrate.
Disclosure of Invention
Aiming at the defects of the existing method for magnetizing and roasting the iron tailings, the invention provides the method for magnetizing and roasting the iron tailings by using the biomass, which is characterized in that the iron tailings and the biomass are respectively magnetized and roasted, so that the reduction and subsequent magnetic separation operation of the iron tailings cannot be influenced by biomass oil produced by biomass pyrolysis, and the magnetite concentrate with high iron grade and high iron recovery rate is obtained.
The above purpose of the invention is realized by the following technical scheme:
the invention provides a method for magnetizing and roasting iron tailings by biomass, which comprises the following steps:
s1, crushing and grinding iron tailings to-0.074 mm to obtain iron tailing powder;
s2, crushing the biomass to obtain biomass powder;
s3, separately placing the iron tailings powder obtained in the step S1 and the biomass powder obtained in the step S2 in different parts in the same heat-resistant closed container, and carrying out magnetization roasting at the temperature of 600-750 ℃;
and S4, cooling, grinding and magnetically separating the roasted iron tailing powder to obtain magnetite concentrate.
According to the invention, the iron tailings and the biomass are respectively magnetized and roasted, so that the bonding and agglomeration of the biomass pyrolysis oil and the iron tailings are effectively avoided, the influence on the reduction of the iron tailings and the subsequent magnetic separation work is prevented, and the realization of the high iron grade and the high iron recovery rate of the magnetite concentrate is facilitated.
The invention utilizes H generated by biomass pyrolysis2Reducing gases such as CO and the like remove crystal water and simultaneously convert weakly magnetic oxides such as hematite and the like in the iron tailings into strongly magnetic magnetite, namely Fe in the iron tailings2O3Reduction to Fe3O4And removing impurities such as silicon, aluminum and the like by grinding, magnetic separation and other processes to obtain the magnetite concentrate with high iron grade and high iron recovery rate.
Most preferably, the temperature of the calcination in step S3 is 660 ℃, see example 6.
Preferably, the roasting time in the step S3 is 10-30 min.
The overlong roasting time not only wastes resources, but also can generate over-reduction phenomenon to lead Fe2O3Is over-reduced to FeO, which is not magnetic and cannot be magnetically sorted out, resulting in a decrease in iron recovery.
Most preferably, the calcination time is 15min, see example 6.
Preferably, the grinding in step S1 is grinding with a planetary ball mill.
Preferably, the mass ratio of the iron tailing powder to the biomass powder is 0-10 and is not 0.
More preferably, the mass ratio of the iron tailing powder to the biomass powder is 10: 1 to 2.5.
Most preferably, the mass ratio of the iron tailing powder to the biomass powder is 5: 1, see example 6.
Preferably, the heat-resistant closed container in step S3 is a closed container capable of resisting 750 ℃.
Preferably, the heat-resistant closed container of step S3 is a tube furnace.
Further preferably, the different locations are on different boats within the tube furnace.
The biomass powder and the iron tailing powder are simultaneously heated by the same heating source, and compared with two heating sources, the heating energy consumption can be obviously reduced.
Preferably, the biomass is crushed to-0.15 mm in step S2.
Preferably, the biomass powder in step S2 includes one or more of cedar wood chips, pine wood chips, eucalyptus wood chips, bamboo chips, or rice powder.
Preferably, in the step S1, the content of iron element in the iron tailings is 30-40%.
Preferably, the baking of step S3 is performed in an inert atmosphere.
Preferably, the cooling in step S4 is cooling by introducing inert gas.
Inert gas cooling is used to prevent oxidation of the magnetite.
Preferably, the grinding in step S4 is to grind the roasted iron ore tailings powder to-0.074 mm.
Preferably, wet magnetic separation is adopted for the magnetic separation in the step S4.
Further preferably, the wet magnetic separation is performed three times.
Further preferably, the magnetic induction intensity of the wet magnetic separation is 0.1-0.2T.
Most preferably, the magnetic induction of the wet magnetic separation is 0.1T, see example 6.
Preferably, drying is further performed after the magnetic separation in step S4.
As a preferred possible embodiment, the method for magnetically roasting the iron tailings by using the biomass comprises the following steps:
s1, crushing iron tailings with the iron element content of 30-40%, and grinding the crushed iron tailings to-0.074 mm by using a planetary ball mill to obtain iron tailing powder;
s2, crushing the biomass to-0.15 mm to obtain biomass powder;
s3, mixing the components in a mass ratio of 10: 1-2.5, respectively placing the iron tailing powder obtained in the step S1 and the biomass powder obtained in the step S2 on two porcelain boats in the same tube furnace, and carrying out magnetizing roasting for 10-30 min at 600-750 ℃ in an inert atmosphere;
s4, introducing inert gas into the tubular furnace, grinding the iron tailing powder subjected to magnetizing roasting to-0.074 mm by using a planetary ball mill after the iron tailing powder is cooled, performing wet magnetic separation for three times at the magnetic induction intensity of 0.1-0.2T, and drying to obtain the magnetite concentrate.
The invention has the following beneficial effects:
1. the method respectively carries out magnetization roasting on the iron tailings and the biomass, effectively avoids the bonding and agglomeration of the biomass pyrolysis oil and the iron tailings, prevents the influence on the reduction of the iron tailings and the subsequent magnetic separation work, and is beneficial to realizing the high iron grade (up to 61.56%) and the high iron recovery rate (up to 99.63%) of the magnetite concentrate.
2. The invention utilizes H generated by biomass pyrolysis2Reducing gases such as CO and the like remove crystal water and simultaneously convert weakly magnetic oxides such as hematite and the like in the iron tailings into strongly magnetic magnetite, namely Fe in the iron tailings2O3Reduction to Fe3O4Removing impurities such as silicon, aluminum and the like by grinding, magnetic separation and other processes to obtain high-iron grade and high-ironAnd (5) recovering the magnetite concentrate.
3. In the invention, natural plant biomass is used for replacing fossil energy in the magnetic roasting of iron tailings, so that greenhouse gas CO generated by biomass incineration treatment can be reduced2Can also reduce SO generated by using fossil fuel2And NOxAnd the discharge of pollutants is realized, and the green sustainable development is realized.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Unless otherwise indicated, reagents and materials used in the following examples are commercially available.
The main chemical components and contents of the raw materials used in the invention are shown in tables 1 and 2:
TABLE 1 iron tailings chemical composition
| Fe2O3 | SiO2 | Al2O3 | SO3 | K2O | ZnO | Others |
| 51.07％ | 24.73％ | 18.58％ | 3.81％ | 0.53％ | 0.25％ | 1.03％ |
TABLE 2 Industrial analysis of Biomass
Example 1 method for magnetizing and roasting iron tailings by using biomass
S1, drying iron tailings in a 105 ℃ blast drying oven for 24 hours, cooling, crushing, and grinding to-0.074 mm (passing through a 200-mesh screen) by using a planetary ball mill to obtain iron tailing powder;
s2, drying the eucalyptus wood in a 105 ℃ blast drying oven for 24 hours, cooling, and crushing the eucalyptus wood in a crusher to-0.15 mm (passing through a 100-mesh screen) to obtain eucalyptus wood chips;
s3, introducing nitrogen into the tubular furnace, replacing air in the furnace chamber and the connection part of the furnace chamber, arranging two gas washing cylinders at the air outlet end, wherein water in one gas washing cylinder is prevented from being sucked backwards, and the other gas washing cylinder is empty so as to prevent water from being sucked backwards into the tubular furnace in the cooling process; respectively placing 10g of iron tailing powder and 1.5g of eucalyptus wood chips on 2 porcelain boats, opening an air inlet end when the temperature of a tube furnace rises to 660 ℃ in a nitrogen atmosphere, rapidly placing the porcelain boats into the tube furnace, closing the air inlet end and inputting nitrogen, and roasting for 15 min;
s4, introducing nitrogen into the tubular furnace, after the iron tailing powder is cooled, grinding the iron tailing powder to-0.074 mm (passing through a 200-mesh screen) by using a planetary ball mill, weighing 5g of the ground iron tailing powder, adding 500mL of deionized water and 50mL of absolute ethyl alcohol, carrying out wet magnetic separation for three times at the magnetic induction intensity of 0.1T, carrying out suction filtration, and drying in a blast drying box at the temperature of 60 ℃ for 24 hours to obtain the magnetite concentrate.
Example 2 method for magnetizing and roasting iron tailings by using biomass
The method of example 1 is different in that, in step S2, pine is used instead of eucalyptus; the amount of pine wood chips used in step S3 was 1 g.
Example 3 method for magnetizing and roasting iron tailings by using biomass
The method of example 1 is different in that step S2 replaces eucalyptus with fir; step S3, the using amount of the cedar wood chips is 2.5 g; and S4, the magnetic induction intensity of the wet magnetic separation is 0.2T.
Example 4 method for magnetizing and roasting iron tailings by using biomass
The method of example 1 is different in that, in step S2, eucalyptus is replaced with bamboo; in the step S3, the roasting temperature is 750 ℃ and the roasting time is 10 min.
Example 5 method for magnetizing and roasting iron tailings by using biomass
The method of example 1 is different in that, in step S2, rice straw is used instead of eucalyptus; in the step S3, the roasting temperature is 600 ℃ and the roasting time is 30 min.
Example 6 method for magnetizing and roasting iron tailings by using biomass
The method of example 1 is different in that the mass of the eucalyptus wood chips in step S3 is 2 g.
Example 7 method for magnetizing and roasting iron tailings by biomass
The method of example 1 is different in that the mass of the eucalyptus wood chips in step S3 is 3.5 g.
Comparative example 1
The method of example 1 is different in that the mass of the eucalyptus wood chips in step S3 is 0.5 g.
Comparative example 2
The method of example 1 is different in that the firing temperature in step S3 is 500 ℃.
Comparative example 3
The method of example 1 is different in that the firing temperature in step S3 is 850 ℃.
Comparative example 4
The method of example 1 is different in that the baking time in step S3 is 5 min.
Comparative example 5
The method of example 1 is different in that step S4 is not ground.
Comparative example 6
The method of example 1 is different in that the iron ore tailings powder and the eucalyptus wood chips are mixed and then placed on the same porcelain boat for calcination in step S3.
Examples of the experiments
The magnetite concentrates obtained in examples 1 to 7 and comparative examples 1 to 6 were subjected to total iron content measurement by the method of GB/T6730.65-2009 "titration method for determining total iron content of iron ore by titanium trichloride reduced potassium dichromate", and the results of iron grade and iron recovery are shown in table 3.
TABLE 3 magnetite concentrate iron grade and iron recovery results
| Grade of iron (%) | Iron recovery (%) | |
| Example 1 | 61.44 | 92.94 |
| Example 2 | 61.56 | 87.62 |
| Example 3 | 59.59 | 98.68 |
| Example 4 | 59.75 | 98.72 |
| Example 5 | 60.08 | 96.43 |
| Example 6 | 60.74 | 99.4 |
| Example 7 | 59.55 | 99.63 |
| Comparative example 1 | 63.37 | 22.87 |
| Comparative example 2 | 60.36 | 2.1 |
| Comparative example 3 | 56.22 | 73.52 |
| Comparative example 4 | 62.41 | 20.52 |
| Comparative example 5 | 56.31 | 64.56 |
| Comparative example 6 | 52.53 | 83.75 |
As can be seen from Table 3, the iron grade of the magnetite concentrate obtained in examples 1 to 7 reaches 59.55 to 61.56%, and the iron recovery rate reaches 87.62 to 99.63%; although the iron grade of the comparative examples 1 to 5 reaches 56.22 to 63.37, the iron recovery rate is only 2.1 to 73.52 percent, which is obviously inferior to that of the examples 1 to 7; although the iron recovery rate of comparative example 6 reached 83.75%, the iron grade was only 52.53%, which is significantly inferior to that of examples 1 to 7. It can be seen that the magnetite concentrates with high iron grade and high iron recovery rate are obtained in the examples 1 to 7, while the magnetite concentrates with high iron grade and high iron recovery rate cannot be simultaneously considered in the comparative examples 1 to 6, which shows that the method provided by the invention can effectively improve the iron grade and the iron recovery rate of the prepared magnetite concentrates.
In summary, the present invention utilizes H produced by biomass pyrolysis2Reducing gases such as CO convert weakly magnetic oxides such as hematite and the like in the iron tailings into strongly magnetic magnetite, biomass and the iron tailings are roasted separately to prevent agglomeration, and impurities such as silicon, aluminum and the like are removed by grinding, magnetic separation and other processes under specific conditions, so that the iron grade and the iron recovery rate of the magnetite concentrate are effectively improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A method for magnetizing and roasting iron tailings by biomass is characterized by comprising the following steps:
s1, crushing and grinding iron tailings to-0.074 mm to obtain iron tailing powder;
s2, crushing the biomass to obtain biomass powder;
s3, separately placing the iron tailings powder obtained in the step S1 and the biomass powder obtained in the step S2 in different parts in the same heat-resistant closed container, and carrying out magnetization roasting at the temperature of 600-750 ℃;
and S4, cooling, grinding and magnetically separating the roasted iron tailing powder to obtain magnetite concentrate.
2. The method of claim 1, wherein the baking time in step S3 is 10-30 min.
3. The method according to claim 1, wherein the mass ratio of the iron tailings powder to the biomass powder is 0-10 and is not 0.
4. The method of claim 1, wherein the heat-resistant sealed container of step S3 is a tube furnace.
5. The method of claim 1, wherein the biomass of step S2 is crushed to-0.15 mm.
6. The method of claim 1, wherein the biomass powder of step S2 comprises one or more of cedar wood chips, pine wood chips, eucalyptus wood chips, bamboo chips, or rice powder.
7. The method of claim 1, wherein the firing of step S3 is performed in an inert atmosphere.
8. The method of claim 1, wherein the cooling in step S4 is cooling by introducing inert gas.
9. The method of claim 1, wherein in step S4, the magnetic separation is wet magnetic separation.
10. The method as claimed in claim 9, wherein the magnetic induction intensity of the wet magnetic separation is 0.1-0.2T.
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