CN113680522A - Method for preparing micro-nano magnetic material by using carbonate-containing iron ore flotation tailings - Google Patents
Method for preparing micro-nano magnetic material by using carbonate-containing iron ore flotation tailings Download PDFInfo
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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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
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- 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
- C22B1/005—Preliminary treatment of scrap
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- 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
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention belongs to the technical field of tailing utilization, and particularly relates to a method for preparing a micro-nano magnetic material by using carbonate-containing iron ore flotation tailings. The method comprises the steps of firstly screening out coarse gangue minerals through grading operation, then obtaining micro-nano ultrafine materials through an ultrafine grinding technology, further adopting a suspension magnetization roasting technology, decomposing in-situ self-magnetization reduction hematite by utilizing ferrous carbonate in flotation tailings to obtain strong magnetic iron minerals, obtaining micro-nano strong magnetic materials through a low-intensity magnetic separation technology, and coating a multi-polar organic high polymer on the surfaces of magnetic particles to obtain the modified micro-nano magnetic materials. The method has the advantages of simple process and low production cost, prepares the tailing resources which are difficult to effectively develop and utilize into the magnetic material with high added value, simultaneously greatly reduces the tailing discharge, reduces the environmental pollution and generates better economic benefit and social benefit.
Description
Technical Field
The invention belongs to the technical field of tailing utilization, and particularly relates to a method for preparing a micro-nano magnetic material by using carbonate-containing iron ore flotation tailings.
Background
In recent years, with the continuous development of the steel industry and the mine industry, the iron ore tailing stock in China is increased year by year, and the increase of the stock of a tailing pond brings various problems of potential safety hazards, environmental pollution, land occupation and the like. Therefore, how to reduce the tailing stockpiling has important practical significance for carrying out high-added-value secondary utilization on tailing resources.
The symbiotic relationship of useful minerals and gangue minerals in the carbonate-containing iron ore is complex, the ore belongs to one of complex and difficult-to-separate iron ores, the ore contains a large amount of easily-argillized iron-containing carbonate minerals, the Mohs hardness of the ore is low, a large amount of micro-fine particle ore mud can be formed in the ore grinding process, and the micro-fine particle iron minerals have the characteristics of small volume, low specific magnetization coefficient and large specific surface area, so that the useful iron minerals in the ore cannot be effectively recovered by adopting the conventional magnetic separation and flotation processes, and a large amount of micro-fine particle weak magnetic iron minerals are lost into tailings in the separation process, so that a large amount of resource waste is caused. For iron ore containing carbonate, although enterprises such as Dongshan sintering plants adopt more advanced step-by-step flotation processes, the separation index is greatly improved compared with that of the original conventional anion reverse flotation process, a large amount of useful iron minerals are lost in the separation process because a large amount of micro-fine hematite and iron carbonate minerals in the ore cannot be effectively recycled, and the iron grade of the comprehensive tailings is up to more than 17%, so that the resource is greatly wasted. The results of the mineralogy research on the flotation tailing process show that the tailings contain iron carbonate, hematite and limonite, wherein the iron minerals are mainly micro-fine particles. Therefore, how to carry out secondary development and utilization on mineral resources in the carbonate-containing iron ore dressing tailings is of great significance.
Disclosure of Invention
In order to solve the problem of utilization of carbonate-containing iron ore flotation tailings, the invention provides a method for preparing a micro-nano magnetic material by using carbonate-containing iron ore flotation tailings, and the specific scheme is as follows:
1. carrying out wet classification on the carbonate-containing iron ore flotation tailings, screening fine-grained materials, and drying the fine-grained materials for later use;
wherein, the classified particle size, or the particle size of the fine-grained material after screening, is-0.023 mm, and the content of the fine-grained material accounts for more than 90 percent.
The invention uses flotation tailings containing carbonate iron ore as raw materials, and utilizes the characteristics of the gangue mineral that quartz hardness is high and iron carbonate and hematite are easy to argillization, fine fraction materials are firstly screened out through grading treatment, most coarse-grained gangue minerals are thrown out, and iron minerals are pre-enriched.
2. And grinding the dried fine-grained materials to be less than 0.5 mu m by adopting ultrafine grinding equipment to prepare the micro-nano fine-grained materials. Wherein the ultrafine grinding equipment comprises an airflow grinder, a vibration mill, a stirring mill, a Raymond mill and the like.
3. Feeding the ground micro-nano fine-grained material into a suspension magnetization roasting system, and adding a reducing agent, particularly only adding a small amount of the reducing agent (the added reducing agent can be all Fe in iron ore)3+30-60% of the amount of the theoretical reducing agent required for completely reducing the magnetite) is roasted at a certain temperature, the hematite is reduced by using the carbon monoxide generated by decomposing the ferrous carbonate in the flotation tailings to obtain the ferromagnetic iron minerals, and the roasted materials are cooled by water. The reaction process is as follows:
FeCO3＝FeO+CO2
3FeO+CO2＝Fe3O4+CO
CO+3Fe2O3＝2Fe3O4+CO2
the suspension magnetization roasting system is a novel magnetization roasting system integrating the technological processes of preheating, heat storage reduction, reoxidation and the like, and mainly comprises a feeding preheating system, a heating oxidation system, a heat storage reduction system, a multistage cooling system, a dust removal recovery system, an automatic control system and the like. The adopted suspension magnetization roasting system can keep mineral particles in a suspension state in the roasting process, and the agglomeration phenomenon of magnetic particles is avoided.
The feeding speed of the ground material into the suspension magnetization roasting system is as follows: 50-100 kg/h.
The reductant species may be hydrogen or carbon monoxide.
The dosage of the reducing agent is 0.1-0.6m3The feeding speed of the material is 50-100kg/h, the content of hematite minerals in the material is about 10-20%, and the required theoretical dosage of the reducing agent is about 0.2-1.0 m3The amount of addition is normally in excess based on the theoretical amount of reducing agent. However, because part of carbon monoxide is generated during the thermal decomposition of ferrous carbonate in the carbonate-containing iron ore flotation tailing material, the iron carbonate in the flotation tailing can be used for decomposing the in-situ self-magnetization reduction hematite to obtain the ferromagnetic material under the condition of only adding a small amount of reducing agent (30-60% of the theoretical amount of the reducing agent).
The roasting temperature is 500-600 ℃.
4. And (3) feeding the water-cooled material into a wet-type cylinder low-intensity magnetic separator for low-intensity magnetic separation, separating micro-nano magnetic particles, filtering the micro-nano magnetic particles, and performing vacuum drying to obtain the micro-nano magnetic material to be prepared. The specific surface area of the obtained micro-nano magnetic material is 5.0-10.0m2The grain size is 100-500nm, and the specific magnetization coefficient is (4000-6000) -10-6cm3And/g, can be used as a magnetofluid material or a water treatment material.
The method can also comprise a step of modifying the prepared micro-nano magnetic material, which comprises the following steps:
5. the cross-linked chitosan-acrylic acid polymer and the micro-nano magnetic material are mixed according to the mass ratio of (0.2-1): 1, mixing in a reaction kettle to uniformly coat the crosslinked chitosan-acrylic acid polymer on the surface of magnetic particles to obtain the modified micro-nano magnetic material.
The synthesis method of the cross-linked chitosan-acrylic acid polymer comprises the following steps: adding a certain amount of chitosan into a reaction kettle, adding water to prepare an emulsion with the mass concentration of 20-40%, controlling the temperature of the reaction kettle to be 50-60 ℃, adding sodium chloride with the mass concentration of 5-10% of that of the chitosan, stirring and dissolving, adding sodium hydroxide with the concentration of 5-10% to adjust the pH value of the emulsion to be 9.0-11.0, then adding sodium trimetaphosphate with the mass concentration of 1-5% of that of the chitosan, reacting for 1-2h, adding hydrochloric acid with the mass fraction of 5-10% to neutralize, adjusting the pH value of the emulsion to be 6.5-7.0, controlling the reaction temperature of the reaction kettle to be 60-80 ℃, adding ammonium persulfate with the mass concentration of 0.1-1% of that of the chitosan, stirring and dissolving, then adding glutaraldehyde with the mass concentration of 0.5-2% of the chitosan and acrylic acid monomer with the mass concentration of 10-50% of the chitosan, continuing to react for 1-2h, and washing, filtering and drying the emulsion to obtain the crosslinked chitosan-acrylic acid polymer.
The modified micro-nano magnetic material can be applied to removal of heavy metal ions in water or soil.
The flotation tailings of the carbonate-containing iron ore are preferably flotation tailings products separated by processes of weak magnetic-strong magnetic-reverse flotation and the like of the carbonate-containing iron ore in Anshan Liaoning, the granularity of the tailings products is-0.038 mm and accounts for more than 80%, the TFe grade in the tailings ores is 15-25%, and useful iron minerals mainly comprise ferrous carbonate and hematite, wherein the content of the ferrous carbonate is 5-10%, the content of the hematite minerals is 10-20%, and SiO is2The content of 70-80% and the content of other elements 5-10%, the carbonate minerals contained in the tailing ore are mainly ferrous carbonate and iron dolomite, the content of the carbonate minerals is 5-10%, and the content of the ferrous carbonate is 5-10% as described above.
The invention has the beneficial effects that: the invention fully utilizes the process mineralogy characteristics of various gangue minerals and iron minerals in the carbonate-containing iron ore flotation tailings, based on the characteristics that the gangue minerals are high in hardness and difficult to grind and the iron minerals are easy to mud, firstly, coarse gangue minerals are screened out through grading operation treatment, fine iron minerals are pre-enriched, then, superfine materials in micro nanometer level are obtained through a superfine grinding technology, further, a suspension magnetization roasting technology is adopted, because ferrous carbonate can generate a part of carbon monoxide during thermal decomposition, ferrous carbonate in flotation tailings can be used for decomposing in-situ automagnetization reduction hematite to obtain strong magnetic iron minerals under the condition of only adding a small amount of reducing agent, micro-nano strong magnetic materials are obtained through a weak magnetic separation technology, and further, in order to improve the adsorption performance of the magnetic materials, a multi-polar group organic high polymer is coated on the surfaces of magnetic particles, and obtaining the modified micro-nano magnetic material, and applying the modified micro-nano magnetic material to removal of heavy metal ions in water or soil.
The method has the advantages of simple flow and low production cost, can prepare the tailing resources which are difficult to effectively develop and utilize into the magnetic material with high added value, simultaneously greatly reduces the tailing discharge, reduces the environmental pollution and generates better economic benefit and social benefit.
Drawings
Fig. 1 is a process flow chart of a preparation method of a modified micro-nano magnetic material in an embodiment of the invention.
Detailed Description
In the embodiment of the invention, the used suspension magnetization roasting system is described in Chinese patent 'a refractory iron ore multistage suspension magnetization roasting-magnetic separation system device and method', patent numbers: CN 201710207721.3.
In the embodiment of the invention, the used cross-linked chitosan-acrylic acid polymer is prepared by the following method: adding 2kg of chitosan into a reaction kettle, adding water to prepare an emulsion with the mass concentration of 40%, controlling the temperature of the reaction kettle to be 50 ℃, then adding 200g of sodium chloride, stirring and dissolving, adding 5% of sodium hydroxide to adjust the pH value of the emulsion to be 10.0, then adding 50g of sodium trimetaphosphate, reacting for 2 hours, adding 10% by mass of hydrochloric acid to neutralize, adjusting the pH value of the emulsion to be 6.5-7.0, controlling the reaction temperature of the reaction kettle to be 70 ℃, adding 10g of ammonium persulfate into the emulsion, stirring and dissolving, then adding 50g of glutaraldehyde and 500g of acrylic acid monomer, continuing to react for 1 hour, washing, filtering and drying the emulsion to obtain the crosslinked chitosan-acrylic acid polymer.
Example 1
The flotation tailing product obtained by separating carbonate-containing iron ore from Anshan Liaoning through weak magnetism-strong magnetism-reverse flotation and other processes has the sample granularity of-0.038 mm accounting for 84.79%, the TFe grade in the ore sample accounting for 20.54%, and useful iron minerals mainly including ferrous carbonate and hematite, wherein the ferrous carbonate content is 5.87%, the hematite mineral content is 13.69%, and SiO is2The content of the carbonate minerals is 74.61 percent, the content of other elements is 6.85 percent, and the carbonate minerals mainly comprise ferrous carbonate and iron dolomite; the carbonate mineral content was 8.84%.
The process flow chart of the method for preparing the micro-nano magnetic material by using the carbonate-containing iron ore flotation tailings is shown in fig. 1, and the specific implementation steps are as follows:
(1) carrying out wet classification on the carbonate-containing iron ore flotation tailing sample, screening out fine-grained materials, and drying the fine-grained materials for later use, wherein the content of grains with the granularity of-0.023 mm in the fine-grained materials accounts for 92.35%;
(2) grinding the dried fine-grained materials to be less than 0.5 mu m by adopting a flat jet mill;
(3) feeding the ground material into a suspension magnetization roasting system, using carbon monoxide as a reducing agent and gas of 0.1m3Decomposing in-situ automagnetization reduction hematite by using ferrous carbonate in flotation tailings at the roasting temperature of 540 ℃ to obtain strong magnetic iron minerals, and cooling the roasted materials by water;
(4) and (3) feeding the water-cooled material into a wet type cylinder low intensity magnetic separator with the model of CTB-1230 to sort out micro-nano magnetic particles, filtering the micro-nano magnetic particles, drying the micro-nano magnetic particles in vacuum, and packaging the micro-nano magnetic particles to obtain the micro-nano magnetic material. The specific surface area of the micro-nano material is 5.0m by measurement2The data range of the size is 100-500nm, and the specific magnetization coefficient is 4000 x 10-6cm3/g。
Example 2
And (2) mixing the crosslinked chitosan-acrylic acid polymer and the micro-nano magnetic material prepared in the embodiment 1 in a mass ratio of 0.2:1 in a reaction kettle, so that the crosslinked chitosan-acrylic acid polymer is uniformly coated on the surfaces of the magnetic particles, and obtaining the modified micro-nano magnetic material.
The obtained modified micro-nano magnetic material is used as an adsorbent for lead ions in a heavy metal polluted water body, the concentration of the lead ions in the heavy metal polluted water body is 250mg/L, the concentration of the lead ions in the water body is only 13.5mg/L after the modified micro-nano magnetic material is treated by determination under the conditions that the use amount of the modified micro-nano magnetic material is 0.8g/L, the pH value is 9.5 and the adsorption time is 2 hours, and the removal rate of the lead ions is as high as 94.60%.
Example 3
The flotation tailing product is obtained by separating carbonate-containing iron ore from Anshan Liaoning through technologies such as weak magnetic-strong magnetic-reverse flotation, the sample granularity is-0.038 mm and accounts for 85.96%, the TFe grade in the ore sample is 22.38%, useful iron minerals mainly comprise ferrous carbonate and hematite, wherein the ferrous carbonate content is 4.53%, the hematite mineral content is 14.78%, the SiO2 content is 78.89%, and the content of other elements is 6.85%, and the carbonate minerals mainly comprise ferrous carbonate and iron dolomite; the carbonate mineral content was 8.47%. The process flow chart of the method for preparing the micro-nano magnetic material by using the carbonate-containing iron ore flotation tailings is shown in fig. 1, and the specific implementation steps are as follows:
(1) carrying out wet classification on the carbonate-containing iron ore flotation tailing sample, screening out fine-grained materials, and drying the fine-grained materials for later use, wherein the content of grains with the granularity of-0.023 mm in the fine-grained materials accounts for 95.62%;
(2) grinding the dried fine-grained materials to be less than 0.5 mu m by adopting a flat jet mill;
(3) feeding the ground material into a suspension magnetization roasting system, adopting carbon monoxide as a reducing agent and gas of 0.3m3H, decomposing in-situ automagnetization reduction hematite by using ferrous carbonate in flotation tailings at the roasting temperature of 550 ℃ to obtain strong magnetic iron minerals, and cooling roasted materials by water;
(4) and (3) feeding the water-cooled material into a wet type cylinder low intensity magnetic separator with the model of CTB-1230 to sort out micro-nano magnetic particles, filtering the micro-nano magnetic particles, drying the micro-nano magnetic particles in vacuum, and packaging the micro-nano magnetic particles to obtain the micro-nano magnetic material. The specific surface area of the micro-nano material is 7.5m by measurement2The grain size range is 100-500nm, and the specific magnetization coefficient is 5500-10-6cm3/g。
Example 4
And (3) mixing the crosslinked chitosan-acrylic acid polymer and the micro-nano magnetic material prepared in the embodiment 3 in a mass ratio of 0.5:1 in a reaction kettle, so that the crosslinked chitosan-acrylic acid polymer is uniformly coated on the surfaces of the magnetic particles, and obtaining the modified micro-nano magnetic material.
The obtained modified micro-nano magnetic material is used as an adsorbent for chromium ions in a heavy metal polluted water body, the concentration of the chromium ions in the heavy metal polluted water body is 150mg/L, the concentration of lead ions in the water body is only 8.65mg/L after the magnetic material is used in an amount of 1.2g/L, the pH value is 10.0, and the adsorption time is 2.5h, and through determination, the lead ion removal rate is 94.23%.
Example 5
The flotation tailing product obtained by separating carbonate-containing iron ore from Anshan Liaoning through weak magnetism-strong magnetism-reverse flotation and other processes has the sample granularity of-0.038 mm accounting for 88.57%, the TFe grade in the ore sample accounting for 23.68%, and useful iron minerals mainly including ferrous carbonate and hematite, wherein the ferrous carbonate content is 6.54%, the hematite mineral content is 18.65%, and SiO is2The content of the carbonate minerals is 70.35 percent, the content of other elements is 5.97 percent, and the carbonate minerals mainly comprise ferrous carbonate and iron dolomite; the carbonate mineral content was 9.26%. The process flow chart of the method for preparing the micro-nano magnetic material by using the carbonate-containing iron ore flotation tailings is shown in fig. 1, and the specific implementation steps are as follows:
(1) carrying out wet classification on the carbonate-containing iron ore flotation tailing sample, screening out fine-grained materials, and drying the fine-grained materials for later use, wherein the content of grains with the granularity of-0.023 mm in the fine-grained materials accounts for 95.73%;
(2) grinding the dried fine-grained materials to be less than 0.5 mu m by adopting a flat jet mill;
(3) feeding the ground material into a suspension magnetization roasting system, and adopting hydrogen as a reducing agent and 0.5m of gas3Decomposing in-situ automagnetization reduction hematite by using ferrous carbonate in flotation tailings at the roasting temperature of 600 ℃ to obtain strong magnetic iron minerals, and cooling the roasted materials by water;
(4) and (3) feeding the water-cooled material into a wet type cylinder low intensity magnetic separator with the model of CTB-1230 to sort out micro-nano magnetic particles, filtering the micro-nano magnetic particles, drying the micro-nano magnetic particles in vacuum, and packaging the micro-nano magnetic particles to obtain the micro-nano magnetic material. The specific surface area of the micro-nano material is 10m by determination2The data range of the size is 100-500nm, and the specific magnetization coefficient is 6000-10-6cm3/g。
Example 6
And (3) mixing the crosslinked chitosan-acrylic acid polymer with the micro-nano magnetic material prepared in the embodiment 5 in a mass ratio of 1:1 in a reaction kettle, and uniformly coating the crosslinked chitosan-acrylic acid polymer on the surface of the magnetic particles to obtain the modified micro-nano magnetic material.
The obtained modified micro-nano magnetic material is used as an adsorbent for lead ions in heavy metal contaminated soil, the concentration of the lead ions in the heavy metal contaminated soil is 285mg/kg, the concentration of the lead ions in the soil is only 28.87mg/L after the treatment through determination under the conditions that the using amount of the magnetic material is 1.6g/kg, the pH value is 9.5 and the adsorption time is 3.5h, and the removal rate of the lead ions is up to 89.87%.
Comparative example 7
The other procedure was the same as in example 5 except that the obtained magnetic material was measured to have a specific surface area of only 2.5m by using a rotary kiln as a firing system2The size data range is 1000-5000nm, and the specific magnetization coefficient is 3000-10-6cm3And/g, compared with the suspension magnetization roasting system adopted by the invention, because the mineral particles cannot be fully suspended and dispersed and the roasting is insufficient, the magnetic particles are agglomerated and mixed, so that the specific surface area is smaller, the specific magnetization coefficient is lower and the surface activity is lower.
Comparative example 8
And (3) mixing the crosslinked chitosan-acrylic acid polymer and the magnetic material prepared in the comparative example 7 in a mass ratio of 1:1 in a reaction kettle, and uniformly coating the crosslinked chitosan-acrylic acid polymer on the surfaces of the magnetic particles to obtain the modified magnetic material.
The modified magnetic material obtained was used as an adsorbent for lead ions in heavy metal contaminated soil in example 6, and the concentration of lead ions in soil was determined to be 55.87mg/L after treatment under the conditions of the modified magnetic material usage amount of 3.0g/kg, the pH value of 9.5 and the adsorption time of 3.5h, compared with example 6, the lead ion removal rate was 80.87% in the case of using more magnetic material, which is still significantly lower than that of example 6.
Claims (10)
1. A method for preparing a micro-nano magnetic material by using carbonate-containing iron ore flotation tailings is characterized by comprising the following steps:
step 1: carrying out wet classification on the carbonate-containing iron ore flotation tailings, screening fine-grained materials, and drying for later use;
step 2: grinding the dried fine-grained materials by adopting ultrafine grinding equipment to prepare micro-nano fine-grained materials;
and step 3: feeding the ground micro-nano fine particle materials into a suspension magnetization roasting system, adding a reducing agent, roasting, and cooling the roasted materials by water;
and 4, step 4: and carrying out low-intensity magnetic separation on the water-cooled material, sorting out micro-nano magnetic particles, filtering and carrying out vacuum drying to obtain the micro-nano magnetic material.
2. The method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings according to claim 1, further comprising the following steps:
and 5: the cross-linked chitosan-acrylic acid polymer and the micro-nano magnetic material are mixed according to the mass ratio of (0.2-1): 1, mixing in a reaction kettle to uniformly coat the crosslinked chitosan-acrylic acid polymer on the surface of magnetic particles to obtain a modified micro-nano magnetic material;
the synthesis method of the cross-linked chitosan-acrylic acid polymer comprises the following steps: adding a certain amount of chitosan into a reaction kettle, adding water to prepare an emulsion with the mass concentration of 20-40%, controlling the temperature of the reaction kettle to be 50-60 ℃, adding sodium chloride with the mass concentration of 5-10% of that of the chitosan, stirring and dissolving, adding sodium hydroxide with the concentration of 5-10% to adjust the pH value of the emulsion to be 9.0-11.0, then adding sodium trimetaphosphate with the mass concentration of 1-5% of that of the chitosan, reacting for 1-2h, adding hydrochloric acid with the mass fraction of 5-10% to neutralize, adjusting the pH value of the emulsion to be 6.5-7.0, controlling the reaction temperature of the reaction kettle to be 60-80 ℃, adding ammonium persulfate with the mass concentration of 0.1-1% of that of the chitosan, stirring and dissolving, then adding glutaraldehyde with the mass concentration of 0.5-2% of the chitosan and acrylic acid monomer with the mass concentration of 10-50% of the chitosan, continuing to react for 1-2h, and washing, filtering and drying the emulsion to obtain the crosslinked chitosan-acrylic acid polymer.
3. The method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings according to claim 1 or 2, wherein in the step 1, the content of the screened fine-fraction material with the granularity of-0.023 mm accounts for more than 90%.
4. The method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings according to claim 1 or 2, wherein the amount of the reducing agent is Fe in the material3+30-60% of the theoretical amount of reducing agent required for the complete reduction into magnetite.
5. The method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings as claimed in claim 1 or 2, wherein the roasting temperature in the step 3 is 500-600 ℃.
6. The method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings according to claim 1 or 2, wherein in the step 3, the speed of feeding the ground micro-nano fine material into the suspension magnetization roasting system is 50-100kg/h, the reducing agent is hydrogen or carbon monoxide, and the dosage of the reducing agent is 0.1-0.6m3/h。
7. The method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings as claimed in claim 1 or 2, wherein the carbonate-containing iron ore is a flotation tailing product obtained by sorting the carbonate-containing iron ore from the east of Liaoning through a weak magnetic-strong magnetic-reverse flotation process.
8. The micro-nano magnetic material prepared by the method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings in the claim 1.
9. The modified micro-nano magnetic material prepared by the method for preparing the micro-nano magnetic material from the carbonate-containing iron ore flotation tailings in the claim 2.
10. The application method of the modified micro-nano magnetic material as claimed in claim 9, wherein the modified micro-nano magnetic material is used for removing heavy metal ions in water or soil.
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