CN111644144A - Water body dephosphorization magnetic material and preparation method and application thereof - Google Patents
Water body dephosphorization magnetic material and preparation method and application thereof Download PDFInfo
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- CN111644144A CN111644144A CN202010547469.2A CN202010547469A CN111644144A CN 111644144 A CN111644144 A CN 111644144A CN 202010547469 A CN202010547469 A CN 202010547469A CN 111644144 A CN111644144 A CN 111644144A
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
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- B01J20/0237—Compounds of Cu
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/024—Compounds of Zn, Cd, Hg
- B01J20/0244—Compounds of Zn
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28009—Magnetic properties
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
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- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
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- B01J20/28016—Particle form
- B01J20/28019—Spherical, ellipsoidal or cylindrical
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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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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- 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 water body dephosphorization magnetic material and a preparation method and application thereof, wherein the preparation method comprises the following steps: crushing and grinding the copper pyrometallurgical slag to obtain copper slag powder; crushing and grinding zinc smelting water extraction slag to obtain zinc slag powder; uniformly mixing copper slag powder and zinc slag powder, adding a binder, and granulating to obtain an adsorption material precursor; heating the adsorbing material precursor to 80-120 ℃ at the speed of 2-5 ℃/min, preserving heat for 1-4h, then heating to 120-300 ℃ at the speed of 5-10 ℃/min, preserving heat for 1-5h, and cooling to obtain the adsorbing material. The adsorbing material has the advantages of low preparation cost, good phosphorus removal effect, large adsorption capacity, simple preparation process, easy operation and no secondary pollution.
Description
Technical Field
The invention belongs to the technical field of environment-friendly materials, and particularly relates to a water body phosphorus removal magnetic material and a preparation method and application thereof.
Background
Due to the rapid development of industrial production, a large amount of phosphorus-containing wastewater is discharged into rivers and lakes, so that the load of nutrient substances in the water body is increased, and the mass propagation of algae and aquatic organisms in the water body is caused. In recent years, large-scale blue-green algae events frequently appear in lakes such as Yunnan lake, Anhui lake, Taihu lake and the like, and a plurality of measures are proposed by the national environmental protection department to relieve the severe form. At present, many techniques have been applied to the removal of phosphorus, such as biological methods, chemical coagulation methods, ion exchange methods, membrane separation methods, artificial wetland methods, electrochemical methods, and adsorption methods. The adsorption method is considered as a main method for treating the phosphorus-rich water bodies in rivers, seas and lakes, has a good application prospect, and has the advantages of high efficiency, economy, easiness in operation, no secondary pollution and the like. According to the existing data, the commonly used phosphorus adsorbent mainly comprises rare earth oxide, iron composite oxide, iron-aluminum composite oxide, magnetic adsorption material and other adsorption substances, wherein the reaction time of the rare earth element is longer, and the speed is slower; the iron-aluminum-zirconium and other composite oxides react faster, but the phosphorus removal rate is low, the performance price is low, the preparation cost of the existing magnetic adsorption material is high, the existing magnetic adsorption material only stays in a test stage and cannot be put into production and use on a large scale, other adsorption substances need to be added with a flocculating agent when in use, a large amount of chemical sludge can be generated, the sludge is precipitated to the bottom of a water body, and finally, the fixed phosphorus can be released again.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a water body phosphorus removal magnetic material and a preparation method and application thereof, and the magnetic material can effectively solve the problems of small adsorption capacity, slow adsorption rate, easiness in causing secondary pollution and high cost of the existing purification material.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
a preparation method of a water body dephosphorization magnetic material comprises the following steps:
(1) crushing and grinding the copper pyrometallurgical slag to obtain copper slag powder;
(2) crushing and grinding zinc smelting water extraction slag to obtain zinc slag powder;
(3) uniformly mixing copper slag powder and zinc slag powder, adding a binder, and granulating to obtain an adsorption material precursor;
(4) heating the adsorbing material precursor in the step (3) to 80-120 ℃ at the speed of 2-5 ℃/min, preserving heat for 1-4h, then heating to 120-300 ℃ at the speed of 5-10 ℃/min, preserving heat for 1-5h, and cooling to obtain the adsorbing material.
The beneficial effects produced by adopting the scheme are as follows: in the process of pyrometallurgical copper smelting, raw materials are roasted to obtain ferromagnetic substances which have strong magnetism, lime is required to be added in the zinc water extraction smelting process, a large amount of active calcium-containing silicate minerals are finally generated after smelting, the calcium-containing silicate minerals and the active calcium-containing silicate minerals are mixed and used for removing phosphorus in a water body, the active calcium-containing silicate is hydrolyzed in the removing process to generate hydroxyl and calcium ions, the hydroxyl and the calcium ions react with phosphate radicals in the water body to generate hydroxyapatite which is a non-toxic and harmless substance, and after the treatment for a certain time, the ferromagnetic substances have magnetism, and finally, magnetic separation equipment is adopted to recover the materials, so that the purpose of removing the phosphorus in the water body can be realized.
The copper slag powder and the zinc slag powder are bonded by a binder and then granulated, the water in the binder is removed in the first heating process at the speed of 2-5 ℃/min, and the crushing of the adsorbing material precursor in the dehydration process can be prevented at a certain heating speed; the second heating process at 5-10 deg.c/min aims at eliminating hydroxyl from the adhesive and converting the hydroxyl into nanometer level silica and/or alumina oxide for adhesion.
Further, the particle size of the copper slag powder in the step (1) is smaller than 325 meshes.
The beneficial effects produced by adopting the scheme are as follows: the copper slag powder has overlarge granularity, easily causes the specific surface area of an adsorption material to be reduced, is not beneficial to removing phosphorus in a water body, and causes the production cost to be increased due to the overlarge granularity.
Furthermore, the particle size of the zinc slag powder in the step (2) is smaller than 325 meshes.
The beneficial effects produced by adopting the scheme are as follows: the over-large granularity of the zinc slag powder is not beneficial to forming, and simultaneously, the specific surface area of the prepared adsorption material is smaller, thus being not beneficial to dephosphorization.
Further, the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor in the step (3) is 3-5:2-4, and the mass of the binder accounts for 15-25% of the mixed powder of the copper slag powder and the zinc slag powder.
Further, the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor in the step (3) is 4:3, the amount of the copper slag powder is more than that of the zinc slag powder, and the mass of the binder accounts for 25% of the mixed powder of the copper slag powder and the zinc slag powder.
The beneficial effects produced by adopting the scheme are as follows: a certain amount of copper slag powder can fully provide ferromagnetic substances, so that the adsorption material can be sucked out of a water body in a magnetic separation mode in the follow-up process, and the separation effect of the adsorption material is improved; a certain amount of zinc slag powder can provide sufficient active calcium silicate as a reaction active site, so that phosphorus in a water body is quickly adsorbed, and the phosphorus removal effect is improved; a certain amount of binder can improve the binding effect, prevent the adsorption material from being broken, and is beneficial to subsequent magnetic separation.
Further, the binder in the step (3) is made of silica sol and/or aluminum sol.
The beneficial effects produced by adopting the scheme are as follows: the hydroxyl of the silica sol or the aluminum sol is easy to remove after high-temperature treatment, and the silica sol or the aluminum sol is finally converted into nano-scale silica and aluminum trioxide with bonding effect, so that the bonding effect is improved.
Further, the mass concentration of the silica sol and/or the aluminum sol in the step (3) is 5-50%.
Further, the mass concentration of the silica sol and/or the aluminum sol in the step (3) is 20-40%.
Further, the mass concentration of the silica sol and/or the aluminum sol in the step (3) is 30%.
The beneficial effects produced by adopting the scheme are as follows: the mass concentration of the silica sol and/or the aluminum sol is too low, so that the material is difficult to form, the mass concentration is too high, fine particles are increased, the prepared material pore channel is easy to block, and the subsequent dephosphorization is not facilitated.
Further, the shape of the adsorbing material precursor in the step (3) is spherical, cylindrical or irregular granular.
Further, in the step (3), when the shape of the adsorbing material precursor is spherical, the particle size of the adsorbing material precursor is phi 1-6 mm.
Further, when the shape of the adsorbing material precursor in the step (3) is spherical, the particle size of the adsorbing material precursor is phi 3 mm.
Further, in the step (3), when the shape of the adsorbing material precursor is cylindrical, the diameter of the adsorbing material precursor is phi 0.5-6 mm.
Further, when the shape of the adsorbing material precursor in the step (3) is cylindrical, the diameter of the adsorbing material precursor is phi 3 mm.
The beneficial effects produced by adopting the scheme are as follows: the granularity or the diameter of the precursor of the adsorbing material is too small, the equipment cannot be realized, the subsequent recovery is not facilitated after the granularity or the diameter is increased, the specific surface area of the adsorbing material is also reduced, and the dephosphorization effect is reduced.
Further, in the step (4), the adsorbing material precursor in the step (3) is heated to 105 ℃ at the speed of 3 ℃/min, and is subjected to heat preservation for 2h, and then is heated to 220 ℃ at the speed of 6 ℃/min, and is subjected to heat preservation for 3 h.
The beneficial effects produced by adopting the scheme are as follows: in the first stage, the temperature is increased to 105 ℃ at the speed of 3 ℃/min, the heat preservation is carried out for 2h, the moisture in the binding agent is mainly removed, and the cracking of the adsorption material can be caused by the overhigh temperature increase speed and heat preservation temperature in the process, so that the forming rate of the adsorption material is poor; in the second stage, the temperature is increased to 220 ℃ at the speed of 6 ℃/min, hydroxyl in the binder molecules is mainly removed in the heat preservation process for 3 hours, and the bonding effect is poor due to the fact that the temperature increase speed and the heat preservation temperature are too high or too low in the stage.
The beneficial effects produced by the invention are as follows:
the raw material of the magnetic material provided by the invention is metal smelting slag, the raw material is easy to obtain, the raw material price is low, the preparation process is simple and easy to operate, the preparation cost is low, and the magnetic material can be used for large-scale batch production and use; the adsorption material has the advantages of large adsorption capacity and high adsorption speed, in the adsorption process, calcium-containing silicate contained in zinc smelting water-quenched slag is used as a reflected active site, the calcium-containing silicate is hydrolyzed to generate hydroxyl and calcium ions, the hydroxyl and the calcium ions react with phosphate radicals in a water body to generate hydroxyapatite, the phosphate radicals in the water body can be fixed, ferromagnetic substances existing in the copper pyrometallurgical slag have magnetic properties, the adsorption material is magnetically separated from the water quickly, and secondary release of phosphorus in a magnetic material can be effectively avoided.
The phosphorus removal chemical reaction mechanism of the invention is as follows:
5Ca2++OH-+3HPO4 2-→Ca5(PO4)3(OH)↓+3H+
3Ca2++2HPO4 2-→Ca3(PO4)2↓+2H+
drawings
FIG. 1 is a diagram of a magnetically adsorbing material in example 1;
FIG. 2 is a diagram of a magnetically adsorbing material in example 2;
FIG. 3 is a diagram of a magnetically adsorbing material in example 3;
FIG. 4 is a diagram of a magnetically adsorbing material in example 4;
FIG. 5 is a diagram of a magnetic adsorbent in example 5.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Example 1
A water body dephosphorization magnetic material is prepared by the following steps:
(1) taking the copper pyrometallurgy slag, crushing and ball-milling to obtain copper slag powder with the grain size of-325 meshes accounting for 100%;
(2) taking zinc smelting water extraction slag, crushing and ball-milling to obtain zinc slag powder with the particle size of 150 meshes which accounts for 100%;
(3) uniformly mixing copper slag powder and zinc slag powder to obtain mixed powder, adding silica sol with the mass concentration of 30% into the mixed powder, then placing the powder and the silica sol into forming equipment, and finally preparing a columnar adsorbing material precursor with the diameter of 3mm, wherein the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor is 5:3, and the binder accounts for 30% of the mass of the mixed powder; placing the columnar material in an oven, heating at a heating rate of 2 ℃/min, and keeping the temperature at 100 ℃ for 2 h; and after the heat preservation is finished, heating at the heating rate of 5 ℃/min, preserving the heat for 2h at the temperature of 180 ℃, and cooling to obtain the phosphorus removal composite adsorption material.
Example 2
A water body dephosphorization magnetic material is prepared by the following steps:
(1) taking the copper pyrometallurgy slag, crushing and ball-milling to obtain copper slag powder with the grain size of-400 meshes accounting for 100%;
(2) taking zinc smelting water extraction slag, crushing and ball-milling to obtain zinc slag powder with the particle size of-200 meshes accounting for 100%;
(3) uniformly mixing copper slag powder and zinc slag powder to obtain mixed powder, placing the mixed powder in a disc granulator, spraying silica sol with the mass concentration of 40% into the mixed powder, and finally preparing a spherical adsorbing material precursor with the diameter of 3mm, wherein the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor is 5:4, and the binder accounts for 25% of the mass of the mixed powder; placing the spherical adsorbing material precursor in an oven, heating at a heating rate of 3 ℃/min, and keeping the temperature at 90 ℃ for 3 h; and after the heat preservation is finished, heating at the heating rate of 8 ℃/min, preserving the heat for 1h at the temperature of 220 ℃, and cooling to obtain the phosphorus removal composite adsorption material.
Example 3
A water body dephosphorization magnetic material is prepared by the following steps:
(1) taking the copper pyrometallurgy slag, crushing and ball-milling to obtain copper slag powder with the grain size of-400 meshes accounting for 100%;
(2) taking zinc smelting water extraction slag, crushing and ball-milling to obtain zinc slag powder with the particle size of-200 meshes accounting for 100%;
(3) evenly mixing copper slag powder and zinc slag powder to obtain mixed powder, adding alumina sol with the mass concentration of 30% into the mixed powder, then placing the mixed powder and the alumina sol into a forming device, and finally preparing a columnar adsorbing material precursor with the diameter of 4mm, wherein the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor is 4:3, the binder accounts for 25 percent of the mass of the mixed powder; placing the precursor of the columnar adsorbing material in an oven, heating at a heating rate of 3 ℃/min, and keeping the temperature for 2h at 105 ℃; and after the heat preservation is finished, heating at the heating rate of 6 ℃/min, preserving the heat for 3 hours at the temperature of 220 ℃, and cooling to obtain the dephosphorization composite adsorption material.
Example 4
A water body dephosphorization magnetic material is prepared by the following steps:
(1) taking the copper pyrometallurgy slag, crushing and ball-milling to obtain copper slag powder with the grain size of-400 meshes accounting for 100%;
(2) taking zinc smelting water extraction slag, crushing and ball-milling to obtain zinc slag powder with the particle size of-200 meshes accounting for 100%;
(3) uniformly mixing copper slag powder and zinc slag powder to obtain mixed powder, placing the mixed powder in a disc granulator, spraying 35% alumina sol by mass concentration into the mixed powder, and finally preparing a columnar adsorbing material precursor with the diameter of 5mm, wherein the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor is 5:3, and the binder accounts for 40% of the mass of the mixed powder; placing the precursor of the columnar adsorbing material in an oven, heating at the heating rate of 5 ℃/min, and keeping the temperature for 1h at the temperature of 110 ℃; and after the heat preservation is finished, heating at the heating rate of 8 ℃/min, preserving the heat for 1h at the temperature of 260 ℃, and cooling to obtain the phosphorus removal composite adsorption material.
Example 5
A water body dephosphorization magnetic material is prepared by the following steps:
(1) taking the copper pyrometallurgy slag, crushing and ball-milling to obtain copper slag powder with the grain size of-400 meshes accounting for 100%;
(2) taking zinc smelting water extraction slag, crushing and ball-milling to obtain zinc slag powder with the particle size of-200 meshes accounting for 100%;
(3) uniformly mixing copper slag powder and zinc slag powder to obtain mixed powder, placing the mixed powder into a disc granulator, adding 25% of silica sol and 40% of alumina sol into the mixed powder, and then placing the mixed powder and the mixed sol into a forming device to finally prepare an irregular granular adsorbing material precursor with the maximum diameter of less than 6mm, wherein the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor is 3:2, the silica sol binder accounts for 30% of the mass of the mixed powder, and the alumina sol binder accounts for 10% of the mass of the mixed powder; placing the adsorbing material precursor in an oven, heating at a heating rate of 4 ℃/min, and keeping the temperature for 1h at the temperature of 110 ℃; and after the heat preservation is finished, heating at the heating rate of 8 ℃/min, preserving the heat for 1h at the temperature of 280 ℃, and cooling to obtain the phosphorus removal composite adsorption material.
Comparative example 1
A water body dephosphorization magnetic material is prepared by the following steps:
(1) taking the copper pyrometallurgy slag, crushing and ball-milling to obtain copper slag powder with the grain size of-325 meshes accounting for 100%;
(2) taking zinc smelting water extraction slag, crushing and ball-milling to obtain zinc slag powder with the particle size of 150 meshes which accounts for 100%;
(3) evenly mixing copper slag powder and zinc slag powder to obtain mixed powder, adding silica sol with the mass concentration of 30% into the mixed powder, then placing the powder and the silica sol into forming equipment, and finally preparing a columnar adsorbing material precursor with the diameter of 8mm, wherein the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor is 2: 1, the binder accounts for 60 percent of the mass of the mixed powder; placing the columnar material in an oven, heating at a heating rate of 6 ℃/min, and keeping the temperature at 100 ℃ for 2 h; and after the heat preservation is finished, heating at the heating rate of 15 ℃/min, preserving the heat for 2 hours at the temperature of 350 ℃, and cooling to obtain the dephosphorization composite adsorption material.
Test examples
Taking phosphorus-containing wastewater, wherein the phosphorus content is 5.0mg/L, averagely dividing the phosphorus-containing wastewater into 6 parts, respectively putting the magnetic adsorbing materials prepared in the examples 1-5 and the comparative example 1 into the phosphorus-containing wastewater, purifying for 10 hours, and measuring the total phosphorus content in the purified water body according to the national standard GB/T1893-1989 of ammonium molybdate spectrophotometer for measuring total phosphorus in water, wherein the specific data are shown in Table 1.
Table 1: table of total phosphorus content in water before and after purification
From the above table, it is known that the magnetic adsorbing materials prepared by the methods in examples 1 to 5 of the present invention can effectively remove phosphorus in water, the phosphorus removal rate can reach 99.75% at most, which is much higher than that of the adsorbing material in comparative example 1, and the adsorption capacity is larger than that in comparative example 1 and reaches 29.65mg/g at most.
Comparing the preparation method in comparative example 1 with the preparation methods in examples 1 to 5, it can be seen that the diameter of the precursor material, the temperature rise rate during drying, the proportional relationship between the copper slag powder and the zinc slag powder, and the amount of the binder all have a certain influence on the adsorption effect.
Claims (10)
1. A preparation method of a water body dephosphorization magnetic material is characterized by comprising the following steps:
(1) crushing and grinding the copper pyrometallurgical slag to obtain copper slag powder;
(2) crushing and grinding zinc smelting water extraction slag to obtain zinc slag powder;
(3) uniformly mixing copper slag powder and zinc slag powder, adding a binder, and granulating to obtain an adsorption material precursor;
(4) heating the adsorbing material precursor in the step (3) to 80-120 ℃ at the speed of 2-5 ℃/min, preserving heat for 1-4h, then heating to 120-300 ℃ at the speed of 5-10 ℃/min, preserving heat for 1-5h, and cooling to obtain the adsorbing material.
2. The preparation method of the water body phosphorus removal magnetic material as claimed in claim 1, wherein the particle size of the copper slag powder in step (1) is smaller than 325 meshes.
3. The preparation method of the water body phosphorus removal magnetic material as claimed in claim 1, wherein the particle size of the zinc slag powder in the step (2) is smaller than 325 meshes.
4. The preparation method of the water body phosphorus removal magnetic material as claimed in claim 1, wherein the mass ratio of the copper slag powder to the zinc slag powder in the adsorbing material precursor in the step (3) is 3-5:2-4, and the mass of the binder accounts for 15-25% of the mixed powder of the copper slag powder and the zinc slag powder.
5. The preparation method of the water body phosphorus removal magnetic material as claimed in claim 1, wherein the binder in the step (3) is made of silica sol andor aluminum sol, and the mass concentration of the silica sol andor the aluminum sol is 5-50%.
6. The preparation method of the magnetic material for removing phosphorus in water body as claimed in claim 1, wherein the shape of the precursor of the adsorbing material in the step (3) is spherical, cylindrical or irregular granular.
7. The preparation method of the water body phosphorus removal magnetic material as claimed in claim 1, wherein in the step (3), when the shape of the adsorbing material precursor is spherical, the particle size of the adsorbing material precursor is phi 1-6 mm; when the shape of the adsorbing material precursor is cylindrical, the diameter of the adsorbing material precursor is phi 0.5-6 mm.
8. The preparation method of the water body phosphorus removal magnetic material as claimed in claim 1, wherein in the step (4), the temperature of the adsorbing material precursor in the step (3) is raised to 105 ℃ at a speed of 3 ℃/min, the temperature is maintained for 2h, then the temperature is raised to 220 ℃ at a speed of 6 ℃/min, and the temperature is maintained for 3 h.
9. The method of any one of claims 1 to 8 is adopted to prepare the water body dephosphorization magnetic material.
10. The application of the magnetic material for removing phosphorus in water body obtained in the claim 9 in removing phosphorus in water body.
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| CN202010547469.2A CN111644144B (en) | 2020-06-16 | 2020-06-16 | Water dephosphorization magnetic material and preparation method and application thereof |
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| CN202010547469.2A CN111644144B (en) | 2020-06-16 | 2020-06-16 | Water dephosphorization magnetic material and preparation method and application thereof |
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| CN111644144A true CN111644144A (en) | 2020-09-11 |
| CN111644144B CN111644144B (en) | 2023-05-02 |
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| CN112058211A (en) * | 2020-09-18 | 2020-12-11 | 昆明理工大学 | Method for processing methylene blue |
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