CN106746096B - Method for treating phosphorus-containing iron ore beneficiation wastewater - Google Patents
Method for treating phosphorus-containing iron ore beneficiation wastewater Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 35
- 239000002351 wastewater Substances 0.000 title claims abstract description 33
- 239000011574 phosphorus Substances 0.000 title claims abstract description 32
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 32
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005456 ore beneficiation Methods 0.000 title claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 29
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000011941 photocatalyst Substances 0.000 claims abstract description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 19
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000002244 precipitate Substances 0.000 claims abstract description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 10
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000004298 light response Effects 0.000 claims abstract description 9
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 8
- 239000008213 purified water Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 5
- 239000000440 bentonite Substances 0.000 claims abstract description 5
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 5
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 5
- 239000012153 distilled water Substances 0.000 claims abstract description 5
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000002699 waste material Substances 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 8
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000006228 supernatant Substances 0.000 claims description 8
- 229960000583 acetic acid Drugs 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- YBYGDBANBWOYIF-UHFFFAOYSA-N erbium(3+);trinitrate Chemical compound [Er+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YBYGDBANBWOYIF-UHFFFAOYSA-N 0.000 claims description 4
- 239000012362 glacial acetic acid Substances 0.000 claims description 4
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052753 mercury Inorganic materials 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000002306 biochemical method Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 239000003463 adsorbent Substances 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
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003653 coastal water Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 iron-aluminum metal oxide Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- 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
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/11—Turbidity
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a method for treating phosphorus-containing iron ore beneficiation wastewater, which comprises the following steps: (1) preparing modified red mud: placing the red mud in hydrochloric acid, stirring in a water bath kettle, washing the precipitate with distilled water, and roasting in a furnace; (2) preparing modified bentonite: soaking bentonite in sodium carbonate solution, stirring, and roasting in a furnace; (3) preparing a visible light response type photocatalyst: a. adding butyl titanate into a vessel filled with absolute ethyl alcohol to obtain a transparent solution A; b. adding absolute ethyl alcohol, deionized water, polyethylene glycol and the like into the other vessel to obtain a solution B; c. dripping the solution B into the solution A, and stirring to obtain titanium dioxide yellow sol; (4) uniformly mixing the modified red mud, the modified bentonite and the photocatalyst; (5) and under the irradiation of a light source, adding the mixed material into a stirring tank filled with the phosphorus-containing iron ore beneficiation wastewater, and stirring and standing. Good treatment effect, simple operation, low cost, short treatment period and capability of recycling the treated purified water and the iron slag.
Description
Technical Field
The invention belongs to the technical field of beneficiation wastewater treatment, and particularly relates to a treatment method of iron ore beneficiation wastewater, which is suitable for treatment and resource utilization of high-phosphorus beneficiation wastewater.
Background
In the last decades, a large amount of high-phosphorus-containing waste water is generated in the mining and processing process of phosphorus-containing iron ores, and because a large amount of mineral processing phosphorus-containing waste water is directly discharged into lakes, rivers, coastal water areas and open sea without being effectively treated, the serious pollution of water bodies is caused, the nutritional load of the water bodies is increased, the aquatic ecological balance is damaged, the sensory performance of the water bodies is deteriorated, the self-purification capacity is weakened, the water quality is reduced, the water supply cost is increased, the food chain is seriously influenced, and even people, animals, livestock and the like are poisoned and die. The seeking of a cheap and efficient phosphorus removal technology is an important problem faced by the mineral processing wastewater treatment technology in the exploitation process of the phosphorus-containing iron ores.
At present, for the treatment of high phosphorus-containing wastewater, the treatment methods commonly used at home and abroad can be classified into a biochemical method, a chemical precipitation method and an adsorption method. The biochemical method has low operation cost, but strict operation requirements and poor stability; the chemical precipitation method is the most effective dephosphorization technique with the best stability so far, but the medicament cost is expensive, and the sludge yield is large; the adsorption dephosphorization method is gradually paid attention to by people because of high efficiency, rapidness, simple equipment and reliable operation. The red mud is waste residue in alumina production, and belongs to one of three wastes. Because the main components of the red mud are silicon dioxide, calcium oxide and iron-aluminum metal oxide, the existence of the substances causes the red mud to have specific removal effect on specific chemical substances. The red mud contains a certain amount of titanium dioxide and has a certain catalytic performance, the red mud is modified and then combined with the photocatalyst and the modified bentonite to be used for treating the phosphorus-containing iron ore dressing wastewater, the adsorption characteristics of the red mud and the modified bentonite can be fully exerted, the catalytic performance can be effectively exerted only by supplementing a small amount of photocatalyst, iron oxide is reduced into zero-valent iron while the phosphorus is removed through adsorption, and the wastewater and the iron slag after treatment can be recycled.
Disclosure of Invention
The invention aims to provide a method for treating phosphorus-containing iron ore beneficiation wastewater, which has the characteristics of good treatment effect, simple process operation, low cost, short treatment period, capability of recycling treated purified water and iron slag and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for treating phosphorus-containing iron ore beneficiation wastewater comprises the following steps:
(1) preparing modified red mud:
according to the aluminum industry waste residue red mud: 50-100 g of hydrochloric acid (mass concentration of 5-10%): 1L, placing the red mud in hydrochloric acid, fully stirring for 1-2 h in a water bath kettle at the temperature of 60-100 ℃, and standing; pouring out the supernatant, washing the precipitate with distilled water for 5-10 times, and then placing the precipitate in a muffle furnace to be roasted for 1-2 hours at 400-500 ℃; then taking out and cooling to room temperature (20-25 ℃, the same applies below) to obtain modified red mud;
(2) preparing modified bentonite:
soaking bentonite in a sodium carbonate solution (mass fraction is 8-12%), stirring for l-2 h at 60-80 ℃, and roasting for 1-2 h in a muffle furnace at 450-500 ℃ to obtain modified bentonite;
(3) preparing a visible light response type photocatalyst:
a. adding 5-8 volumes of butyl titanate into a vessel filled with 10-15 volumes of absolute ethyl alcohol, and keeping stirring until the butyl titanate and the absolute ethyl alcohol are uniformly mixed to obtain a yellow transparent solution A;
b. taking another vessel, respectively adding 5-8 volumes of absolute ethyl alcohol, 1-2 volumes of deionized water, 2-4 volumes of glacial acetic acid, 0.5-1 volume of polyethylene glycol, 0.5-1 volume of erbium nitrate, 0.5-1 volume of cerous nitrate, 0.5-1 volume of lanthanum nitrate and 0.5-1 volume of ferric nitrate crystal, and keeping stirring until the mixture is uniformly mixed to obtain a solution B;
c. dripping the solution B into the solution A while stirring, and sealing and aging for 20-24 h after the dripping is finished to obtain stable, uniform, clear and transparent titanium dioxide yellow sol; and (3) putting the titanium dioxide yellow sol into a temperature control furnace (NWTX-17C) to be thermally treated to 550 ℃ at a speed of 3-5 ℃/min, and then treating for 1-2 h at 550 ℃ to complete crystal form conversion to obtain the visible light response type photocatalyst.
(4) Uniformly mixing 70-80% of modified red mud, 15-25% of modified bentonite and 5-10% of photocatalyst by mass fraction to obtain a mixed material;
the mixed material comprises the following components in percentage by mass:
(5) under the condition of light source irradiation, 5-20 g of the mixed material is added into each liter of wastewater in a stirring box filled with phosphorus-containing iron ore beneficiation wastewater, the materials are stirred for 1-2 hours and then are kept stand, the supernatant is purified water which can be reused in the beneficiation process, and the precipitate is iron slag which can be recycled after reduction.
The light source is any one or a mixed light source of any two or more of ultraviolet light, a high-pressure mercury lamp, natural light and fluorescence.
According to the invention, the red mud is modified and then combined with the photocatalyst and the modified bentonite to be used for treating the phosphorus-containing iron ore beneficiation wastewater, so that the adsorption characteristics of the red mud and the modified bentonite can be fully exerted, the catalytic performance can be efficiently exerted only by supplementing a small amount of the photocatalyst, the iron oxide is reduced into zero-valent iron while adsorbing and removing phosphorus, the wastewater after treatment has high phosphorus removal rate, the red mud can be directly used for online circulation and resource efficient utilization of beneficiation wastewater, the water consumption in the beneficiation process is greatly saved, the beneficiation pollution problem caused by wastewater discharge is obviously reduced, the iron content of the reduced iron slag in the waste slag reaches more than 90%, the iron slag can be directly used as a steelmaking, ironmaking and sintering raw material, the in-plant recycling is realized, the production cost is reduced by 'replacing ores' through resource utilization, and the waste slag pollution is reduced.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the modified red mud and the modified bentonite are used as phosphorus adsorbents, waste is treated by waste, the dephosphorizing agent is low in cost, the waste is recycled, the application prospect is wide, and the recycling effective utilization can be realized;
2. the modified red mud is combined with the photocatalyst and the modified bentonite to be used for treating the phosphorus-containing iron ore dressing wastewater, so that the adsorption characteristics of the red mud and the modified bentonite can be fully exerted, the catalytic performance can be effectively exerted only by supplementing a small amount of photocatalyst, and the iron oxide is efficiently reduced into zero-valent iron while the phosphorus is removed through adsorption;
3. the process is simple to operate, the cost is low, the treatment period is short, and the treated purified water and the iron slag can be recycled.
4. The dephosphorization rate of the phosphorus-containing iron ore beneficiation wastewater can reach more than 95%, the pH of the effluent is 6.5-8.0, and the turbidity of the effluent is less than 2NTU, so that the phosphorus-containing iron ore beneficiation wastewater can be directly used for online circulation and resource efficient utilization of beneficiation waste liquid. The reduced iron slag in the waste slag has a taste of more than 90 percent and can be directly used as raw materials for steel making, iron making, sintering and the like.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the content of the present invention is not limited to the following examples.
Example 1:
a method for treating phosphorus-containing iron ore beneficiation wastewater comprises the following steps:
(1) preparing modified red mud:
according to the aluminum industry waste residue red mud: hydrochloric acid (with a mass concentration of 10%): 1L, placing the red mud in hydrochloric acid, fully stirring for 2h in a water bath kettle at the temperature of 60 ℃, and standing; pouring out the supernatant, washing the precipitate with distilled water for 5 times, and calcining in a muffle furnace at 400 deg.C for 1 h; then taking out and cooling to room temperature to obtain modified red mud;
(2) preparing modified bentonite:
soaking bentonite in a sodium carbonate solution (12% by mass), stirring for 2h at 60 ℃, and roasting for 2h in a muffle furnace at 500 ℃ to obtain modified bentonite;
(3) preparing a visible light response type photocatalyst:
a. adding 5 volumes of butyl titanate into a vessel filled with 10 volumes of absolute ethyl alcohol, and keeping stirring until the butyl titanate and the absolute ethyl alcohol are uniformly mixed to obtain a yellow transparent solution A;
b. taking another vessel, respectively adding 8 volumes of absolute ethyl alcohol, 2 volumes of deionized water, 4 volumes of glacial acetic acid, 1 volume of polyethylene glycol, 0.5 volume of erbium nitrate, 1 volume of cerous nitrate, 1 volume of lanthanum nitrate and 0.5 volume of ferric nitrate crystal into the vessel, and maintaining stirring until the mixture is uniformly mixed to obtain a solution B;
c. dripping the solution B into the solution A while stirring, and sealing and aging for 20h after the dripping is finished to obtain stable, uniform, clear and transparent titanium dioxide yellow sol; putting the mixture into a program temperature control furnace, carrying out heat treatment at 5 ℃/min to 550 ℃, and then carrying out treatment for 2h at 550 ℃ to complete crystal form conversion to obtain the visible light response type photocatalyst.
(4) Uniformly mixing 70% of modified red mud, 25% of modified bentonite and 5% of photocatalyst according to a certain mass fraction to obtain a mixed material;
(5) under the irradiation condition of a 125W high-pressure mercury lamp, 5g of the mixed material is added into each liter of wastewater in a stirring tank filled with phosphorus-containing iron ore beneficiation wastewater, and the mixture is stirred for 2 hours and then is kept stand. The supernatant is purified water which can be reused in the mineral separation process, and the precipitate is iron slag which can be recycled after reduction. The dephosphorization rate of the phosphorus-containing iron ore beneficiation wastewater reaches 96.2%, the pH of effluent is 7.6, and the turbidity of the effluent is 2 NTU. The reduced iron slag in the slag had a grade of 92.1%.
Example 2:
the method for treating the phosphorus-containing iron ore beneficiation wastewater is characterized by comprising the following steps of:
(1) preparing modified red mud:
according to the aluminum industry waste residue red mud: hydrochloric acid (with a mass concentration of 10%): 1L, placing the red mud in hydrochloric acid, fully stirring for 1h in a water bath kettle at the temperature of 100 ℃, and standing; pouring out the supernatant, washing the precipitate with distilled water for 5 times, and calcining in a muffle furnace at 400 deg.C for 1 h; then taking out and cooling to room temperature to obtain modified red mud;
(2) preparing modified bentonite:
soaking bentonite in a sodium carbonate solution (mass fraction is 12%), stirring for 2h at 60 ℃, and roasting for 1h in a muffle furnace at 450 ℃ to obtain modified bentonite;
(3) preparing a visible light response type photocatalyst:
a. adding 5 volumes of butyl titanate into a vessel filled with 10 volumes of absolute ethyl alcohol, and keeping stirring until the butyl titanate and the absolute ethyl alcohol are uniformly mixed to obtain a yellow transparent solution A;
b. taking another vessel, respectively adding 5 volumes of absolute ethyl alcohol, 1 volume of deionized water, 2 volumes of glacial acetic acid, 1 volume of polyethylene glycol, 0.5 volume of erbium nitrate, 0.5 volume of cerous nitrate, 1 volume of lanthanum nitrate and 1 volume of ferric nitrate crystal, and keeping stirring until the mixture is uniformly mixed to obtain a solution B;
c. dripping the solution B into the solution A while stirring, and sealing and aging for 20h after the dripping is finished to obtain stable, uniform, clear and transparent titanium dioxide yellow sol; putting the mixture into a program temperature control furnace, carrying out heat treatment at 5 ℃/min to 550 ℃, and then carrying out treatment for 2h at 550 ℃ to complete crystal form conversion to obtain the visible light response type photocatalyst.
(4) Uniformly mixing the modified red mud, the modified bentonite and the photocatalyst according to the following mass fractions;
uniformly mixing the modified red mud, the modified bentonite and the photocatalyst (in a certain proportion, the sum of the modified red mud, the modified bentonite and the photocatalyst is equal to 100 percent) to obtain a mixed material;
(5) under the irradiation condition of a 20W ultraviolet lamp, 10g of the mixed material is added into each liter of wastewater in a stirring tank filled with phosphorus-containing iron ore beneficiation wastewater, and the mixture is stirred for 2 hours and then is kept stand. The supernatant is purified water which can be reused in the mineral separation process, and the precipitate is iron slag which can be recycled after reduction. The dephosphorization rate of the phosphorus-containing iron ore beneficiation wastewater reaches 98.6%, the pH of effluent is 7.2, and the turbidity of the effluent is 2 NTU. The reduced iron slag in the slag had a grade of 92.9%.
Claims (1)
1. A treatment method for dephosphorizing phosphorus-containing iron ore dressing wastewater and recovering iron slag comprises the following steps:
(1) preparing modified red mud:
according to the aluminum industry waste residue red mud: putting 50-100 g of hydrochloric acid with the mass fraction of 5-10% into 1L of hydrochloric acid, putting the red mud into the hydrochloric acid, fully stirring for 1-2 h in a water bath kettle at the temperature of 60-100 ℃, and standing; pouring out the supernatant, washing the precipitate with distilled water for 5-10 times, and then placing the precipitate in a muffle furnace to be roasted for 1-2 hours at 400-500 ℃; then taking out and cooling to room temperature to obtain modified red mud;
(2) preparing modified bentonite:
soaking bentonite in 8-12 wt% sodium carbonate solution, stirring at 60-80 ℃ for l-2 h, and roasting in a muffle furnace at 450-500 ℃ for 1-2 h to obtain modified bentonite;
(3) preparing a visible light response type photocatalyst:
a. adding 5-8 volumes of butyl titanate into a vessel filled with 10-15 volumes of absolute ethyl alcohol, and stirring until the butyl titanate and the absolute ethyl alcohol are uniformly mixed to obtain a yellow transparent solution A;
b. taking another vessel, respectively adding 5-8 volumes of absolute ethyl alcohol, 1-2 volumes of deionized water, 2-4 volumes of glacial acetic acid, 0.5-1 volume of polyethylene glycol, 0.5-1 volume of erbium nitrate, 0.5-1 volume of cerous nitrate, 0.5-1 volume of lanthanum nitrate and 0.5-1 volume of ferric nitrate crystal, and stirring until the mixture is uniformly mixed to obtain a solution B;
c. dripping the solution B into the solution A while stirring, and sealing and aging for 20-24 h after the dripping is finished to obtain stable, uniform, clear and transparent titanium dioxide yellow sol; putting the titanium dioxide yellow sol into a temperature control furnace, carrying out heat treatment at a speed of 3-5 ℃/min to 550 ℃, then carrying out treatment at 550 ℃ for 1-2 h, and completing crystal form conversion to obtain a visible light response type photocatalyst;
(4) uniformly mixing modified red mud, modified bentonite and a photocatalyst according to a certain mass fraction to obtain a mixed material, wherein the mixed material comprises the following components in parts by mass:
(5) under the irradiation condition of any one or more than two of mixed light sources of ultraviolet light, a high-pressure mercury lamp, natural light and fluorescence, 5-20 g of mixed materials are added into each liter of wastewater in a stirring box filled with phosphorus-containing iron ore beneficiation wastewater, the materials are stirred for 1-2 hours and then are kept stand, the supernatant is purified water reused in the beneficiation process, and the precipitate is iron slag which can be recycled after reduction.
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| CN103230802A (en) * | 2013-04-12 | 2013-08-07 | 广东工业大学 | Preparation method of composite photocatalyst with visible light response and arsenic removing method |
| CN103480357A (en) * | 2013-08-13 | 2014-01-01 | 南通大学 | Rubidium ions doped nanometer titania photocatalyst and preparation method thereof |
| CN105195124A (en) * | 2015-10-10 | 2015-12-30 | 中国科学院水生生物研究所 | Preparation method and application of photocatalyst capable of removing refractory organic matters |
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| CN101423306A (en) * | 2008-11-18 | 2009-05-06 | 武汉理工大学 | Treatment method and equipment for high phosphorus haematite mineral processing acid wastewater |
| CN103230802A (en) * | 2013-04-12 | 2013-08-07 | 广东工业大学 | Preparation method of composite photocatalyst with visible light response and arsenic removing method |
| CN103480357A (en) * | 2013-08-13 | 2014-01-01 | 南通大学 | Rubidium ions doped nanometer titania photocatalyst and preparation method thereof |
| CN105195124A (en) * | 2015-10-10 | 2015-12-30 | 中国科学院水生生物研究所 | Preparation method and application of photocatalyst capable of removing refractory organic matters |
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