Mine wastewater dephosphorization treatment system and dephosphorization method

Abstract

The invention relates to a mine wastewater dephosphorization treatment system and a dephosphorization method, and belongs to the technical field of water dephosphorization. Iron nitrate nonahydrate and ferric chloride hexahydrate are creatively used as iron sources, glucose is used as a carbon source and a reducing agent, urea is used as an alkali source, a granular material with ferroferric oxide as a core and a carbon layer as a shell is synthesized on the basis of a hydrothermal synthesis method, then an aqueous hydrogen peroxide solution is used for further oxidation treatment, more oxygen-containing groups are constructed, and the oxygen-containing groups are prepared. The preparation method comprises the following steps: preparing a metal lanthanum modified material, then adding lanthanum chloride for doping lanthanum to obtain the metal lanthanum modified material, and finally, sequentially carrying out surface modification on the metal lanthanum modified material through polydopamine and an amino silane coupling agent to prepare the phosphorus removal agent, so that when the phosphorus removal agent is used for removing phosphorus from mine wastewater in a phosphorus removal treatment system provided with an electromagnet, only simple magnetic attraction treatment is needed, and the phosphorus removal efficiency is greatly improved. The dephosphorization agent can be separated and recycled through the method, meanwhile, metal lanthanum in the dephosphorization agent is still dissolved out less even though the dephosphorization agent is used for mine wastewater with high acidity, and the dephosphorization effect is very good.

Description

Technical Field

[0001] The invention belongs to the technical field of water body phosphorus removal, and specifically relates to a mine wastewater phosphorus removal treatment system and a phosphorus removal method. Background Art

[0002] With the large-scale exploitation of mineral resources, the discharge of mine wastewater is increasing day by day. Among the characteristics of many mine wastewaters, the excessive phosphorus content has become a significant and urgent problem to be solved. If the mine wastewater is not dephosphorized before being discharged, it will undoubtedly have a serious impact on the entire ecological environment. Based on this, many water dephosphorization technologies have been widely used in the dephosphorization process of mine wastewater, such as dephosphorization by adding adsorbents. However, the existing adsorbents still have certain disadvantages that limit their actual application effects. This is because on the one hand, these adsorbents often have small particle sizes and are easily suspended in the water body, making it difficult to achieve solid-liquid separation after dephosphorization and difficult to recover. On the other hand, in order to enhance the dephosphorization effect, most of these adsorbents are modified with lanthanum. However, due to the complex and variable composition of actual mine wastewater, acidic properties account for a large part of it. Therefore, this leads to a limited scope of use of adsorbents modified with lanthanum. Lanthanum is very easy to dissolve in an acidic environment, that is, secondary metal pollution occurs, which ultimately outweighs the gain. Summary of the invention

[0003] In view of the problems existing in the prior art, the purpose of the present invention is to provide a dephosphorization treatment system and a dephosphorization method for mine wastewater. The present invention creatively uses ferric nitrate nonahydrate and ferric chloride hexahydrate as iron sources, glucose as a carbon source and reducing agent, and urea as an alkali source. Based on a hydrothermal synthesis method, a granular material with a core of ferroferric oxide and a shell of a carbon layer is synthesized. Then, an aqueous hydrogen peroxide solution is used to further oxidize the granular material to construct more oxygen-containing groups, and then lanthanum chloride is added to dope lanthanum to obtain a metal lanthanum modified material. Finally, after surface modification with polydopamine and an aminosilane coupling agent in sequence, a dephosphorizer is prepared. When the dephosphorization is carried out on mine wastewater in a dephosphorization treatment system provided with an electromagnet, only a simple magnetic attraction treatment is required to separate and recover the dephosphorizer. At the same time, even in the face of highly acidic mine wastewater, less metal lanthanum in the dephosphorizer is dissolved, and the dephosphorization effect is very good.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A mine wastewater dephosphorization treatment system comprises a reaction tank and a drainage tank; a first water inlet is arranged on the top of the reaction tank; a drainage outlet is arranged on the side of the reaction tank; an electromagnet is arranged on the bottom of the reaction tank; a stirring device is arranged inside the reaction tank; a second water inlet is arranged on the top of the drainage tank; the drainage outlet and the second water inlet are connected by a pipeline; and a pipeline pump is arranged on the pipeline.

[0006] A phosphorus removal method based on the mine wastewater phosphorus removal treatment system, the phosphorus removal method comprising the following steps:

[0007] (1) Adding mine wastewater and dephosphorization agent into the reaction tank through the first water inlet in sequence, turning on the stirring device to remove phosphorus, turning off the stirring device, turning on the electromagnet for magnetic attraction, and turning on the pipeline pump to pump the liquid in the reaction tank into the drainage tank.

[0008] As a preferred technical solution of the present invention, the weight ratio of the mine wastewater to the dephosphorization agent in step (1) is 100:2-3.

[0009] As a preferred technical solution of the present invention, the phosphorus removal agent in step (1) is prepared by the following steps:

[0010] Step A: deionized water, ferric nitrate nonahydrate, ferric chloride hexahydrate, glucose and urea are mixed at a weight ratio of 30-40:3:1.5-2:2-2.2:6-7 at room temperature, stirred for 5-10 minutes, then hydrothermally reacted at 180-185° C. for 12-16 hours, naturally cooled to room temperature, filtered, and the residue was washed with deionized water, and finally vacuum dried at 40-60° C. until constant weight, to obtain component A;

[0011] Step B: stirring the hydrogen peroxide aqueous solution and component A at a weight ratio of 80-100:8-10 at 40-45° C. for 1 hour, filtering with suction, taking the filter residue, washing it with deionized water, and finally vacuum drying it at 40-60° C. until constant weight, to obtain component B;

[0012] Step C: Mix deionized water, lanthanum chloride and component B in a weight ratio of 60:1:0.1-0.2 under ultrasonic stirring at room temperature for 5-10 minutes, adjust the pH to 9-10 with sodium hydroxide solution, then continue stirring for 45-60 minutes, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 40-60° C. until constant weight, to obtain component C;

[0013] Step D: Component C, dopamine and buffer are mixed at a weight ratio of 1:0.2-0.3:50 at room temperature under stirring for 15-30 minutes, and then sodium hydroxide solution is added dropwise while stirring to adjust the pH to 8.5-9. After the addition is completed, stirring is continued for 4-5 hours, and the filter is filtered to obtain the filter residue, which is washed with deionized water, and finally vacuum dried at 40-60° C. until constant weight is obtained to obtain component D;

[0014] Step E: Component D, aminosilane coupling agent, anhydrous ethanol and deionized water are mixed at a weight ratio of 1:0.08-0.1:80:0.1 at 50-70° C. for 24 hours, filtered, the filter residue is taken, washed with deionized water, and finally vacuum dried at 40-60° C. until constant weight, and the preparation is completed.

[0015] Furthermore, the mass fraction of the aqueous hydrogen peroxide solution in step B is 30-40%.

[0016] Furthermore, the power of the ultrasound in step C is 300-500W.

[0017] Furthermore, the mass fraction of the sodium hydroxide solution in step C is 3-5%.

[0018] Furthermore, the buffer in step D is a Tris hydrochloric acid buffer with a pH of 7.2.

[0019] Furthermore, the dripping rate in step D is controlled at 1-2 drops / s.

[0020] Furthermore, the mass fraction of the sodium hydroxide solution in step D is 1-3%.

[0021] Furthermore, the aminosilane coupling agent in step E is γ-aminopropyltrimethoxysilane.

[0022] As a preferred technical solution of the present invention, the phosphorus removal in step (1) refers to phosphorus removal at a stirring speed of 150-200 rpm at room temperature for 3-4 hours.

[0023] As a preferred technical solution of the present invention, the working parameters of the electromagnet in step (1) are to generate a magnetic induction intensity of 150-200 mT after power is turned on; and the magnetic attraction time is 15-30 min.

[0024] Beneficial effects of the present invention:

[0025] (1) The present invention creatively uses ferric nitrate nonahydrate and ferric chloride hexahydrate as iron sources, glucose as a carbon source and reducing agent, and urea as an alkali source, based on a hydrothermal synthesis method, to synthesize a granular material with a core of ferroferric oxide and a shell of a carbon layer, and then further oxidizes it with an aqueous hydrogen peroxide solution to construct more oxygen-containing groups, and then adds lanthanum chloride to dope lanthanum to obtain a metallic lanthanum modified material, and finally sequentially performs surface modification with polydopamine and an aminosilane coupling agent to prepare a dephosphorizing agent, so that when it is used to dephosphorize mine wastewater in a dephosphorization treatment system equipped with an electromagnet, only a simple magnetic attraction treatment is required to separate and recover the dephosphorizing agent, and at the same time, even in the face of highly acidic mine wastewater, less metallic lanthanum in the dephosphorizing agent is dissolved, and the dephosphorization effect is very good.

[0026] (2) The present invention creatively uses ferric nitrate nonahydrate and ferric chloride hexahydrate as iron sources, glucose as a carbon source and reducing agent, and urea as an alkali source, based on a hydrothermal synthesis method, to synthesize a granular material with a core of ferroferric oxide and a shell of a carbon layer. On the one hand, ferroferric oxide can be attracted by a magnet, which gives the subsequent phosphorus removal agent the ability to be magnetically separated and recovered. On the other hand, the carbon layer itself has a certain pore structure, which has a good adsorption effect on phosphate groups, thereby achieving the effect of phosphorus removal. At the same time, since the granular material obtained by the hydrothermal synthesis method has a high content of hydroxyl groups on the surface, the granular material can remove phosphorus to a certain extent through the bonding between hydroxyl groups and phosphate groups. Then, it is further oxidized by adding an aqueous hydrogen peroxide solution to construct more oxygen-containing groups, which not only enhances the phosphorus removal effect, but also More sites are provided for subsequent surface modification, and then lanthanum doping is completed through the coordination effect of lanthanum and hydroxyl groups. Its introduction can produce ligand exchange with phosphate-containing groups, namely inner sphere complexation, and promote the precipitation of phosphorus on its surface. Finally, a phosphorus removal agent is prepared after surface modification with polydopamine and aminosilane coupling agent in sequence. A certain amount of polydopamine is introduced as a protective layer, so that it can play a role of steric shielding and restraint protection for lanthanum in an acidic environment, reducing the chance of hydrogen ions contacting it. However, this also correspondingly reduces the phosphorus removal effect. For this reason, the aminosilane coupling agent is modified by the action of hydroxyl and silaneoxy groups, and the property of amino groups that are easily protonated in an acidic environment is used to make the surface of the phosphorus removal agent positively charged, that is, electrostatic interaction is generated with negatively charged phosphate-containing groups, promoting the combination of the two, and enhancing the phosphorus removal effect.

[0027] (3) The present invention creatively prepares a dephosphorization agent, which can remove phosphorus through various means and has excellent dephosphorization effect. At the same time, the dephosphorization agent can be separated and recovered by simple magnetic adsorption treatment. In addition, the dissolution of lanthanum in the dephosphorization agent in an acidic environment is still relatively low, which effectively avoids secondary metal pollution. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0029] The mine wastewater in all embodiments and comparative examples of the present invention is from the same batch of mine wastewater. After testing, the pH value is 3.11, which is acidic, and the phosphorus (element) content is 1094.5 mg / L (bismuth phosphomolybdenum blue spectrophotometry), and it does not contain lanthanum (atomic absorption spectroscopy).

[0030] Example 1

[0031] A mine wastewater dephosphorization treatment system comprises a reaction tank and a drainage tank; a first water inlet is arranged on the top of the reaction tank; a drainage outlet is arranged on the side of the reaction tank; an electromagnet is arranged on the bottom of the reaction tank; a stirring device is arranged inside the reaction tank; a second water inlet is arranged on the top of the drainage tank; the drainage outlet and the second water inlet are connected by a pipeline; and a pipeline pump is arranged on the pipeline.

[0032] A phosphorus removal method based on the mine wastewater phosphorus removal treatment system, the phosphorus removal method comprising the following steps:

[0033] (1) Adding mine wastewater and dephosphorization agent into the reaction tank through the first water inlet in sequence, turning on the stirring device to remove phosphorus, turning off the stirring device, turning on the electromagnet for magnetic attraction, and turning on the pipeline pump to pump the liquid in the reaction tank into the drainage tank.

[0034] The weight ratio of the mine wastewater to the dephosphorization agent in step (1) is 100:2.

[0035] The phosphorus removal agent in step (1) is prepared by the following steps:

[0036] Step A: deionized water, ferric nitrate nonahydrate, ferric chloride hexahydrate, glucose and urea are mixed at a weight ratio of 30:3:1.5:2:6 at room temperature for 5 minutes, and then hydrothermally reacted at 180° C. for 12 hours, naturally cooled to room temperature, filtered, and the residue was taken, washed with deionized water, and finally vacuum dried at 40° C. until constant weight, to obtain component A;

[0037] Step B: Stir the hydrogen peroxide solution and component A at a weight ratio of 80:8 at 40° C. for 1 h, filter with suction, take the filter residue, wash it with deionized water, and finally vacuum dry it at 40° C. until constant weight, to obtain component B;

[0038] Step C: deionized water, lanthanum chloride and component B are mixed in a weight ratio of 60:1:0.1 under ultrasonic stirring at room temperature for 5 minutes, the pH is adjusted to 9 with sodium hydroxide solution, and then stirring is continued for 45 minutes, and the filter is filtered to obtain the filter residue, which is washed with deionized water, and finally vacuum dried at 40° C. until constant weight is obtained to obtain component C;

[0039] Step D: Component C, dopamine and buffer solution were mixed at a weight ratio of 1:0.2:50 at room temperature under stirring for 15 minutes, and then sodium hydroxide solution was added dropwise while stirring to adjust the pH to 8.5. After the addition was completed, stirring was continued for 4 hours, and the residue was filtered and washed with deionized water, and finally vacuum dried at 40° C. until constant weight was obtained to obtain component D;

[0040] Step E: Component D, aminosilane coupling agent, anhydrous ethanol and deionized water are mixed at a weight ratio of 1:0.08:80:0.1 at 50° C. for 24 h, filtered, the filter residue is taken, washed with deionized water, and finally vacuum dried at 40° C. until constant weight, and the preparation is completed.

[0041] The mass fraction of the hydrogen peroxide aqueous solution in step B is 30%.

[0042] The power of the ultrasound in step C is 300W.

[0043] The mass fraction of the sodium hydroxide solution in step C is 3%.

[0044] The buffer in step D is a Tris hydrochloric acid buffer with a pH of 7.2.

[0045] The rate of the dripping in step D is controlled at 1 drop / s.

[0046] The mass fraction of the sodium hydroxide solution in step D is 1%.

[0047] The aminosilane coupling agent in step E is γ-aminopropyltrimethoxysilane.

[0048] The phosphorus removal in step (1) refers to phosphorus removal at a stirring speed of 150 rpm at room temperature for 3 hours.

[0049] The working parameters of the electromagnet in step (1) are that a magnetic induction intensity of 150 mT is generated after power is turned on; and the magnetic attraction time is 15 minutes.

[0050] Example 2

[0051] A mine wastewater dephosphorization treatment system comprises a reaction tank and a drainage tank; a first water inlet is arranged on the top of the reaction tank; a drainage outlet is arranged on the side of the reaction tank; an electromagnet is arranged on the bottom of the reaction tank; a stirring device is arranged inside the reaction tank; a second water inlet is arranged on the top of the drainage tank; the drainage outlet and the second water inlet are connected by a pipeline; and a pipeline pump is arranged on the pipeline.

[0052] A phosphorus removal method based on the mine wastewater phosphorus removal treatment system, the phosphorus removal method comprising the following steps:

[0053] (1) Adding mine wastewater and dephosphorization agent into the reaction tank through the first water inlet in sequence, turning on the stirring device to remove phosphorus, turning off the stirring device, turning on the electromagnet for magnetic attraction, and turning on the pipeline pump to pump the liquid in the reaction tank into the drainage tank.

[0054] The weight ratio of the mine wastewater to the dephosphorization agent in step (1) is 100:3.

[0055] The phosphorus removal agent in step (1) is prepared by the following steps:

[0056] Step A: deionized water, ferric nitrate nonahydrate, ferric chloride hexahydrate, glucose and urea are mixed at a weight ratio of 40:3:2:2.2:7 at room temperature with stirring for 10 minutes, and then hydrothermally reacted at 185° C. for 16 hours, naturally cooled to room temperature, filtered, and the filter residue is taken, washed with deionized water, and finally vacuum dried at 60° C. until constant weight, to obtain component A;

[0057] Step B: stirring the hydrogen peroxide aqueous solution and component A at a weight ratio of 100:10 at 45° C. for 1 hour, filtering with suction, taking the filter residue, washing it with deionized water, and finally vacuum drying it at 60° C. until constant weight, to obtain component B;

[0058] Step C: deionized water, lanthanum chloride and component B are mixed in a weight ratio of 60:1:0.2 under ultrasonic stirring at room temperature for 10 minutes, the pH is adjusted to 10 with a sodium hydroxide solution, and then stirring is continued for 60 minutes, and the filter residue is filtered and washed with deionized water, and finally vacuum dried at 60° C. until constant weight is obtained to obtain component C;

[0059] Step D: Component C, dopamine and buffer solution were mixed at a weight ratio of 1:0.3:50 at room temperature under stirring for 30 minutes, and then sodium hydroxide solution was added dropwise while stirring to adjust the pH to 9. After the addition was completed, stirring was continued for 5 hours, and the residue was filtered and washed with deionized water, and finally vacuum dried at 60° C. until constant weight was obtained to obtain component D;

[0060] Step E: Component D, aminosilane coupling agent, anhydrous ethanol and deionized water are mixed at a weight ratio of 1:0.1:80:0.1 at 70° C. for 24 h, filtered, the filter residue is taken, washed with deionized water, and finally vacuum dried at 60° C. until constant weight, and the preparation is completed.

[0061] The mass fraction of the hydrogen peroxide aqueous solution in step B is 40%.

[0062] The power of the ultrasound in step C is 500W.

[0063] The mass fraction of the sodium hydroxide solution in step C is 5%.

[0064] The buffer in step D is a Tris hydrochloric acid buffer with a pH of 7.2.

[0065] The rate of the dripping in step D is controlled at 2 drops / s.

[0066] The mass fraction of the sodium hydroxide solution in step D is 3%.

[0067] The aminosilane coupling agent in step E is γ-aminopropyltrimethoxysilane.

[0068] The phosphorus removal in step (1) refers to phosphorus removal at a stirring speed of 200 rpm at room temperature for 4 hours.

[0069] The working parameters of the electromagnet in step (1) are that a magnetic induction intensity of 200 mT is generated after power is turned on; and the magnetic attraction time is 30 min.

[0070] Example 3

[0071] A mine wastewater dephosphorization treatment system comprises a reaction tank and a drainage tank; a first water inlet is arranged on the top of the reaction tank; a drainage outlet is arranged on the side of the reaction tank; an electromagnet is arranged on the bottom of the reaction tank; a stirring device is arranged inside the reaction tank; a second water inlet is arranged on the top of the drainage tank; the drainage outlet and the second water inlet are connected by a pipeline; and a pipeline pump is arranged on the pipeline.

[0072] A phosphorus removal method based on the mine wastewater phosphorus removal treatment system, the phosphorus removal method comprising the following steps:

[0073] (1) Adding mine wastewater and dephosphorization agent into the reaction tank through the first water inlet in sequence, turning on the stirring device to remove phosphorus, turning off the stirring device, turning on the electromagnet for magnetic attraction, and turning on the pipeline pump to pump the liquid in the reaction tank into the drainage tank.

[0074] The weight ratio of the mine wastewater to the dephosphorization agent in step (1) is 100:2.8.

[0075] The phosphorus removal agent in step (1) is prepared by the following steps:

[0076] Step A: deionized water, ferric nitrate nonahydrate, ferric chloride hexahydrate, glucose and urea are mixed at a weight ratio of 35:3:1.8:2.1:6.5 at room temperature for 8 minutes, and then hydrothermally reacted at 183° C. for 14 hours, naturally cooled to room temperature, filtered, and the filter residue was washed with deionized water, and finally vacuum dried at 50° C. until constant weight, to obtain component A;

[0077] Step B: Stir the hydrogen peroxide solution and component A at a weight ratio of 90:9 at 43° C. for 1 hour, filter with suction, take the filter residue, wash it with deionized water, and finally vacuum dry it at 50° C. until constant weight, to obtain component B;

[0078] Step C: deionized water, lanthanum chloride and component B are mixed in a weight ratio of 60:1:0.15 under ultrasonic stirring at room temperature for 8 minutes, the pH is adjusted to 9.5 with sodium hydroxide solution, and then stirring is continued for 50 minutes, and the filter residue is filtered and washed with deionized water, and finally vacuum dried at 50° C. until constant weight is obtained to obtain component C;

[0079] Step D: Component C, dopamine and buffer solution were mixed at a weight ratio of 1:0.25:50 at room temperature under stirring for 20 minutes, and then sodium hydroxide solution was added dropwise while stirring to adjust the pH to 8.8. After the addition was completed, stirring was continued for 4.5 hours, and the residue was filtered, washed with deionized water, and finally vacuum dried at 50° C. until constant weight was obtained to obtain component D;

[0080] Step E: Component D, aminosilane coupling agent, anhydrous ethanol and deionized water are mixed at a weight ratio of 1:0.09:80:0.1 at 60° C. for 24 h, filtered, the filter residue is taken, washed with deionized water, and finally vacuum dried at 50° C. until constant weight, and the preparation is completed.

[0081] The mass fraction of the hydrogen peroxide aqueous solution in step B is 35%.

[0082] The power of the ultrasound in step C is 400W.

[0083] The mass fraction of the sodium hydroxide solution in step C is 4%.

[0084] The buffer in step D is a Tris hydrochloric acid buffer with a pH of 7.2.

[0085] The rate of the dripping in step D is controlled at 1.5 drops / s.

[0086] The mass fraction of the sodium hydroxide solution in step D is 2%.

[0087] The aminosilane coupling agent in step E is γ-aminopropyltrimethoxysilane.

[0088] The phosphorus removal in step (1) refers to phosphorus removal at a stirring speed of 180 rpm at room temperature for 3.5 hours.

[0089] The working parameters of the electromagnet in step (1) are that a magnetic induction intensity of 190 mT is generated after power is turned on; and the magnetic attraction time is 20 min.

[0090] Comparative Example 1

[0091] On the basis of Example 3, the aminosilane coupling agent was replaced with an equal weight of deionized water, and the rest remained unchanged.

[0092] Comparative Example 2

[0093] On the basis of Example 3, dopamine was replaced by an equal weight of buffer solution, and the rest remained unchanged.

[0094] Comparative Example 3

[0095] On the basis of Example 3, the aqueous hydrogen peroxide solution was replaced with an equal weight of deionized water, and the rest remained unchanged.

[0096] Comparative Example 4

[0097] On the basis of Example 3, the weight ratio of component C, dopamine and buffer was changed from 1:0.25:50 to 1:0.4:50, and the rest remained unchanged.

[0098] Test Example 1

[0099] Phosphorus removal effect test:

[0100] The water in the drainage pools of Example 3 and Comparative Examples 1-4 was sampled respectively, and then the phosphorus content was determined by bismuth phosphomolybdenum blue spectrophotometry, and the phosphorus removal rate was calculated.

[0101] Table 1. Phosphorus removal effect test results

[0102] Phosphorus removal rate / % Example 3 99.7 Comparative Example 1 80.5 Comparative Example 2 86.6 Comparative Example 3 92.0 Comparative Example 4 96.2

[0103] Test Example 2

[0104] Lanthanum dissolution test:

[0105] The water in the drainage pools of Example 3 and Comparative Examples 1-4 was sampled respectively, and then the lanthanum content was determined by atomic absorption spectrometry. If the lanthanum concentration was greater than 1 mg / L, it was considered that dissolution occurred.

[0106] Table 2. Lanthanum dissolution test results

[0107] Is the concentration of lanthanum greater than 1 mg / L? Example 3 no Comparative Example 1 no Comparative Example 2 yes Comparative Example 3 no Comparative Example 4 no

[0108] From the comparison between Test Examples 1-2, Example 3 and Comparative Examples 1-4, it can be seen that the phosphorus removal agent prepared by the present invention has excellent phosphorus removal effect, and the dissolution of lanthanum is still relatively small even in an acidic environment.

[0109] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A mine wastewater phosphorus removal treatment system, characterized in that: The mine wastewater phosphorus removal treatment system includes a reaction tank and a drainage tank; a first water inlet is arranged on the top of the reaction tank; a drainage outlet is arranged on the side of the reaction tank; an electromagnet is arranged on the bottom of the reaction tank; a stirring device is arranged inside the reaction tank; a second water inlet is arranged on the top of the drainage tank; the drainage outlet and the second water inlet are connected by a pipeline; and a pipeline pump is arranged on the pipeline.

2. A phosphorus removal method based on the mine wastewater phosphorus removal treatment system according to claim 1, characterized in that: The phosphorus removal method comprises the following steps: (1) Adding mine wastewater and dephosphorization agent into the reaction tank through the first water inlet in sequence, turning on the stirring device to remove phosphorus, turning off the stirring device, turning on the electromagnet for magnetic attraction, and turning on the pipeline pump to pump the liquid in the reaction tank into the drainage tank.

3. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 2, characterized in that: In step (1), the weight ratio of the mine wastewater to the dephosphorization agent is 100:2-3.

4. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 2, characterized in that: The phosphorus removal agent in step (1) is prepared by the following steps: Step A: deionized water, ferric nitrate nonahydrate, ferric chloride hexahydrate, glucose and urea are mixed at a weight ratio of 30-40:3:1.5-2:2-2.2:6-7 at room temperature, stirred for 5-10 minutes, then hydrothermally reacted at 180-185° C. for 12-16 hours, naturally cooled to room temperature, filtered, and the residue was washed with deionized water, and finally vacuum dried at 40-60° C. until constant weight, to obtain component A; Step B: stirring the hydrogen peroxide aqueous solution and component A at a weight ratio of 80-100:8-10 at 40-45° C. for 1 hour, filtering with suction, taking the filter residue, washing it with deionized water, and finally vacuum drying it at 40-60° C. until constant weight, to obtain component B; Step C: Mix deionized water, lanthanum chloride and component B in a weight ratio of 60:1:0.1-0.2 under ultrasonic stirring at room temperature for 5-10 minutes, adjust the pH to 9-10 with sodium hydroxide solution, then continue stirring for 45-60 minutes, filter, take the filter residue, wash with deionized water, and finally vacuum dry at 40-60° C. until constant weight, to obtain component C; Step D: Component C, dopamine and buffer are mixed at a weight ratio of 1:0.2-0.3:50 at room temperature under stirring for 15-30 minutes, and then sodium hydroxide solution is added dropwise while stirring to adjust the pH to 8.5-9. After the addition is completed, stirring is continued for 4-5 hours, and the filter is filtered to obtain the filter residue, which is washed with deionized water, and finally vacuum dried at 40-60° C. until constant weight is obtained to obtain component D; Step E: Component D, aminosilane coupling agent, anhydrous ethanol and deionized water are mixed at a weight ratio of 1:0.08-0.1:80:0.1 at 50-70° C. for 24 hours, filtered, the filter residue is taken, washed with deionized water, and finally vacuum dried at 40-60° C. until constant weight, and the preparation is completed.

5. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 4, characterized in that: The mass fraction of the sodium hydroxide solution in step C is 3-5%.

6. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 4, characterized in that: The buffer in step D is a Tris hydrochloric acid buffer with a pH of 7.

2.

7. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 4, characterized in that: The mass fraction of the sodium hydroxide solution in step D is 1-3%.

8. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 4, characterized in that: The aminosilane coupling agent in step E is γ-aminopropyltrimethoxysilane.

9. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 2, characterized in that: The phosphorus removal in step (1) refers to phosphorus removal at a stirring speed of 150-200 rpm at room temperature for 3-4 hours.

10. A phosphorus removal method based on a mine wastewater phosphorus removal treatment system according to claim 2, characterized in that: The working parameters of the electromagnet in step (1) are that it generates a magnetic induction intensity of 150-200 mT after being energized; and the magnetic attraction time is 15-30 min.