Micro-channel magnetic adsorption light-driven purification device and purification method thereof

Abstract

The invention discloses a micro-channel magnetic adsorption light-driven purification device and a purification method thereof. An outlet of a first main pipe and an inlet of a second main pipe are communicated with an inlet and an outlet of a negative pressure device, control valves are arranged at the inlet of the first main pipe and the outlet of the second main pipe, the lower ends of a first vertical pipe and a second vertical pipe are communicated with middle connectors of the first main pipe and the second main pipe, and the upper ends of the first vertical pipe and the second vertical pipe are communicated with an inlet and an outlet of a one-way valve through two connecting pipes. A liquid adding pipe outlet of the adsorbent adding device is communicated with a liquid adding opening in the first main pipe, a laser transmitter is fixed to the position, between the negative pressure device and the second vertical pipe, of the second main pipe, and a metal plate B and a metal plate A which are horizontally arranged up and down are fixed to the position, between the laser transmitter and the second vertical pipe, in the second main pipe. A particle sensor is arranged on the second main pipe and located between the second vertical pipe and the control valve, and the first main pipe and the second main pipe are provided with three particle concentration measuring devices arranged at intervals. By adopting an adsorption technology, a light sail technology and a strong magnetic technology, high-efficiency purification work of industrial wastewater is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial wastewater purification, and specifically relates to a microchannel magnetic adsorption light-driven purification device and a purification method thereof. Background Art

[0002] Industrial wastewater usually contains a variety of metal ions. These metal ions are different from other organic pollutants. After being discharged into the environment, they cannot be degraded into harmless products. They can only change their existence form or be transferred and diluted. Some metal ions are even enriched in organisms through the food chain, respiration or direct contact, posing a threat to organisms and human health. In severe cases, they may even cause gene mutations or induce cancer.

[0003] The existing water treatment methods for industrial wastewater mainly include chemical method and reverse osmosis method. Among them, the use of chemical method for water treatment may produce by-products, such as disinfection by-products or chemical reaction products, which are likely to cause potential harm to the environment or health; the use of reverse osmosis for water treatment has the following disadvantages: first, reverse osmosis requires high pressure to push water through the filter membrane, resulting in high energy consumption; second, the equipment cost and maintenance cost are high, making the water purification cost high; third, the treatment efficiency is low; fourth, the water quality requirements are high. The existing method for treating metal ions in industrial wastewater also uses adsorption methods for treatment, but when the adsorbent is added, the adsorbent is easy to float in the middle and upper layers of the industrial wastewater, which is easy to cause uneven adsorption of heavy metal ions in the wastewater, poor treatment effect, and low treatment efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a microchannel magnetic adsorption light-driven purification device and a purification method thereof.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention discloses a microchannel magnetic adsorption light-driven purification device, which comprises a mounting frame, an adsorbent dosing device, a pipeline component, a laser emitter and a negative pressure device.

[0007] The pipeline assembly includes a main pipe 1, a main pipe 2, a vertical pipe 1, a vertical pipe 2, a connecting pipe and a one-way valve; the main pipe 1 and the main pipe 2 are arranged horizontally and coaxially, the outlet of the main pipe 1 and the inlet of the main pipe 2 are respectively fixed and connected with the inlet and outlet of the negative pressure device, and the negative pressure device and the main pipe 2 are both fixed on the mounting frame, and the inlet of the main pipe 1 and the outlet of the main pipe 2 are both provided with control valves; the lower ends of the vertical pipe 1 and the vertical pipe 2 arranged at intervals are respectively fixed and connected with the middle interfaces of the main pipe 1 and the main pipe 2, and the upper ends are respectively fixed and connected with one ends of two horizontally arranged connecting pipes through a turning joint, and the other ends of the two connecting pipes are respectively fixed and connected with the inlet and outlet of the one-way valve, and the inlet of the one-way valve is closer to the outlet of the main pipe 2 than the outlet.

[0008] The adsorbent dosing device is arranged on the mounting frame, and the outlet of the liquid adding pipe of the adsorbent dosing device is fixed and connected with the liquid adding port opened on the main pipe 1; a laser emitter is fixed on the main pipe 2 between the negative pressure device and the vertical pipe 2, the emission end of the laser emitter faces downward, and a channel is opened on the main pipe 2 just below the emission end of the laser emitter, and a glass sheet is fixed in the channel; a horizontal and symmetrically arranged metal plate A and a metal plate B are fixed in the main pipe 2 between the laser emitter and the vertical pipe 2, and the metal plate B is just above the metal plate A; a particle sensor is arranged on the main pipe 2 between the vertical pipe 2 and the control valve. A particle concentration measuring device is arranged between the liquid adding port and the vertical pipe 1 on the main pipe 1, between the laser emitter and the metal plate A on the main pipe 2, and between the particle sensor and the corresponding control valve on the main pipe 2.

[0009] Preferably, the one-way valve is a Tesla valve.

[0010] Preferably, the adsorbent dosing device is provided with a magnetic aluminum-based adsorbent channel and an ion water channel, and the opening and closing of the switch valves in the two channels are controlled by a mixing control chip, and the mixing control chip adopts a microfluidic chip.

[0011] The present invention provides a purification method for a microchannel magnetic adsorption light-driven purification device, which is specifically as follows:

[0012] Step 1: connect the inlet of main pipe 1 to box 1 containing industrial wastewater through a water pump and a water pipe, connect the outlet of main pipe 2 to the inlets of box 2 and box 3 respectively through a three-way valve and two outlet pipes, and put the magnetic aluminum-based adsorbent and ionized water into the liquid storage tank of the adsorbent dosing device.

[0013] Step 2: open the control valve on the main pipe 1, start the water pump, and make the industrial wastewater of preset volume 1 flow into the pipeline assembly, and then close the water pump and the control valve on the main pipe 1; then the adsorbent dosing device uses ionized water and magnetic aluminum-based adsorbent to configure a magnetic aluminum-based adsorbent solution of preset concentration, the flow valve on the liquid adding pipe of the adsorbent dosing device is opened, and the liquid adding pump of the adsorbent dosing device transports the configured magnetic aluminum-based adsorbent solution of preset volume 2 to the main pipe 1 through the liquid adding pipe and the liquid adding port, and the flow valve on the liquid adding pipe is closed; wait for a preset time 1, the magnetic aluminum-based adsorbent in the magnetic aluminum-based adsorbent solution adsorbs various metal ions in the industrial wastewater and forms a granular polymer, and each ion concentration measuring device measures the concentration of each metal ion in the industrial wastewater in the pipeline assembly in real time.

[0014] Step 3: The negative pressure device starts working to transport the industrial wastewater in main pipe 1 to main pipe 2, and transports the industrial wastewater in main pipe 2 to main pipe 1 through vertical pipe 1, vertical pipe 2, two connecting pipes and a one-way valve, so that the industrial wastewater circulates in the pipeline assembly. After waiting for the preset time 2, the laser transmitter emits the laser.

[0015] Step 4: Power on metal plate A and metal plate B.

[0016] Step 5. When the industrial wastewater carrying the particulate polymer is transported from the negative pressure device to the metal plate A, when the particulate polymer passes through the laser emitter, the laser hits the particulate polymer, causing the particulate polymer to reach the metal plate A and be adsorbed on the metal plate A.

[0017] Step 6. When each particle concentration measuring device detects that the concentration of each metal ion in the industrial wastewater in the pipeline assembly is lower than the respective preset concentration value, and the particle sensor detects that the total concentration of the particle polymer and the magnetic aluminum-based adsorbent flowing in the industrial wastewater in the pipeline assembly is lower than the preset value, the industrial wastewater in the pipeline assembly is purified, and the control valve and the three-way valve on the main pipe 2 are opened. The purified industrial wastewater flows from the main pipe 2 through the control valve, the three-way valve and an outlet pipe into the box body 2.

[0018] Step 7: Repeat Step 2, Step 3, Step 5 and Step 6 until all industrial wastewater purification is completed, the laser emitter and the negative pressure device stop working, and the metal plate A and the metal plate B are powered off.

[0019] Preferably, in step six, if after waiting for 10 to 30 minutes, the total concentration of particulate polymers and magnetic aluminum-based adsorbents in the industrial wastewater detected by the particle sensor is always greater than the preset value, the particulate polymers on the metal plate A are discharged once, and then the process returns to step two; the discharge of the particulate polymers is as follows: the metal plate A and the metal plate B are powered off, the adsorption effect of the metal plate A on the particulate polymers disappears, the two control valves are opened, and the outlet of the three-way valve is switched, the water pump works to transport the industrial wastewater to the main pipe one, the industrial wastewater flows from the main pipe one through the negative pressure device into the main pipe two, and carries the particulate polymers that have fallen off the metal plate A in the main pipe two through the control valve, the three-way valve and another outlet pipe on the main pipe two into the box three, and finally the water pump, the negative pressure device and the two control valves are turned off.

[0020] Preferably, the preparation process of the magnetic aluminum-based adsorbent is:

[0021] S1. Purify carbon black blocks and prepare carbon black particles with a diameter less than 1 μm.

[0022] S2. Prepare aluminate-aluminum-based adsorbent.

[0023] S3. Prepare magnetic powder containing nickel and cobalt.

[0024] S4. Prepare a magnetic aluminum-based adsorbent by using the prepared carbon black particles, aluminate-aluminum-based adsorbent and magnetic powder.

[0025] More preferably, the process of S2 is: dissolving 60 g of aluminate in 1 L of water to prepare a 60% aluminate solution; adding 15 ml of a 2 mol / L sodium hydroxide solution to the aluminate solution to generate aluminum hydroxide precipitate, and adjusting the pH value of the aluminate solution to 3.1-3.4, and then adding 100 ml of a 2 mol / L sodium hydroxide solution to the aluminate solution to adjust the pH value of the aluminate solution to 5.8-9.6; then slowly adding 150 ml of 0.140 wt% oxalic acid as an anti-hydration agent using a glass rod, and using a magnetic stirrer to stir the mixture containing aluminum hydroxide and The mixture of the anti-hydration agent is stirred and allowed to stand for 0.5 h after stirring; the mixture is filtered under reduced pressure using a pressure filter to obtain a precipitate, the precipitate is washed with a sodium hydroxide solution having a concentration of 0.015 mol / L, and the washed precipitate is subjected to microwave desorption treatment using a secondary thermal analyzer, and after desorption treatment, the precipitate is rinsed with deionized water and dried at 150°C; the precipitate is washed, microwave desorbed and rinsed with deionized water for 3 times, and each repeated treatment lasts for 3 h to obtain a product; finally, the product is vacuum dried using a vacuum dryer to obtain an aluminate-aluminum-based adsorbent.

[0026] More preferably, the process of S3 is specifically as follows: dissolving 10g of 99% pure cobalt sulfate salt in 1L of 0.1mol / L oxalic acid solution, then adding 20wt% cobalt oxalate and 20wt% nickel oxalate solution until precipitate 2 is obtained, and then placing precipitate 2 in a calcination furnace for calcination, and the calcination furnace is filled with 99.9% nitrogen, the calcination temperature is 300-350°C, the calcination time is 3-7h, and product 2 is obtained, and then product 2 is cooled using 99% pure liquid nitrogen, and then magnetically attracted by a neodymium iron boron magnet to obtain a magnetic powder containing nickel and cobalt.

[0027] More preferably, the process of S4 is: 500g of aluminate-aluminum-based adsorbent is mixed with carbon black particles and a sodium hydroxide solution with a concentration of 9.09mol / L to form a mixture II, and the volume ratio of the aluminate-aluminum-based adsorbent, the carbon black particles and the sodium hydroxide solution is (50-60): (190-200): (190-200); then the mixture II is calcined at a calcination temperature of 400-600°C for 8h to obtain a product III; the product III is cross-linked with the magnetic powder by a cross-linking agent to form a mixture The invention discloses a method for preparing a magnetic aluminum-based adsorbent comprising the steps of: preparing a magnetic powder comprising: preparing a magnetic powder comprising: a first magnetic powder and a second magnetic powder; ...

[0028] Preferably, the calculation process of the laser intensity when the particle polymer reaches the metal plate A under the impact of the laser is:

[0029] First, ignoring the negative pressure effect of the negative pressure device, the volume flow rate Q of the industrial wastewater in the main No. 2 pipeline under the action of natural pressure difference is:

[0030]

[0031] Where ΔP nat is the natural pressure difference, and ΔP nat =ρ·g·h f , ρ is the density of industrial wastewater, h f is the head loss, and l is the distance from the inlet of main pipe 2 to the inlet of vertical pipe 2, R is the radius of main pipe 2, C is the pipe roughness coefficient of main pipe 2, η eff is the effective viscosity of industrial wastewater, then

[0032]

[0033] The speed of industrial wastewater in main pipe 2 is

[0034]

[0035] After the negative pressure of the negative pressure device is superimposed, the speed of industrial wastewater in the main pipe 2 is v 水 =v1+v 初 , where v 初 The initial velocity provided by the negative pressure device to the industrial wastewater;

[0036] The time for the particle polymer to travel from the laser emitter to the metal plate A is equal to the horizontal distance between the laser emitter and the metal plate A divided by the speed of the particle polymer in the horizontal direction. The speed of the particle polymer in the horizontal direction is consistent with the speed of the industrial wastewater in the main pipe 2. Assuming that the horizontal distance between the laser emitter and the metal plate A is d, the time t for the particle polymer to travel from the laser emitter to the metal plate A is

[0037]

[0038] Assuming that the energy of the laser is completely absorbed when it acts on the particle polymer, that is, the energy reflection loss is negligible, the light pressure F of the laser acting on the particle polymer is 光 for

[0039]

[0040] Where P is the light pressure, I0 is the laser intensity, c is the light speed, r is the radius of the particle polymer, and A1 is the area where the laser acts on the particle polymer;

[0041] The resistance F encountered by the granular polymer when it moves vertically in industrial wastewater 阻 for

[0042] F 阻 =6πη eff rv y

[0043] In the formula, v y is the vertical velocity of the granular polymer when it moves toward the metal plate A;

[0044] Before the laser hits the particle polymer, the initial velocity of the particle polymer in the vertical direction is 0. After the laser hits the particle polymer, the particle polymer gains vertical acceleration, and the particle polymer accelerates in the vertical direction. 光 The size remains unchanged, F 阻 As the particle polymer speed increases, the particle polymer is subjected to the light pressure F according to the law of conservation of momentum. 光 and resistance F 阻 The kinetic equation of action is:

[0045] m·Δv=(F 光 -F 阻 )·Δt

[0046] Where Δv is the velocity change within Δt, m is the mass of a single particle polymer, and ρ p is the density of the particle polymer;

[0047] When the light pressure F 光 With resistance F 阻When equilibrium is reached, F 光 =F 阻 , the particle polymer no longer accelerates, and the velocity of the particle polymer in the vertical direction is

[0048]

[0049] After the laser hits the particle polymer, the initial velocity of the particle polymer in the vertical direction is v0, and then the particle polymer is only subject to the resistance F in the vertical direction. 阻 The particle polymer is subject to resistance F in the vertical direction. 阻 The kinetic equation of action is

[0050]

[0051] Assuming that the vertical movement time of the particle polymer is t1, then

[0052]

[0053] Assuming the vertical displacement of the particle polymer is y, then

[0054]

[0055] In order to make the particle polymer at the top of the second main tube reach the metal plate A in the vertical direction when t1=t, the displacement of the particle polymer at the top of the second main tube is the radius R of the second main tube, that is, y=R, then

[0056]

[0057] have to

[0058]

[0059] Then, the laser intensity I0 when the top particulate polymer of the main pipe 2 reaches the metal plate A in the vertical direction at t1=t is obtained as follows:

[0060]

[0061] The present invention has the following beneficial effects:

[0062] 1. The present invention combines the use of adsorption technology, light sail technology and strong magnetic technology to achieve the purification of industrial wastewater, and the purification efficiency is high and the purification cost is low. Specifically, the present invention configures a magnetic aluminum-based adsorbent solution through an adsorbent dosing device, and adds the magnetic aluminum-based adsorbent solution into the pipeline component, so that the magnetic aluminum-based adsorbent adsorbs various metal ions in the industrial wastewater in the pipeline component to form a granular polymer, thereby achieving the purification of industrial wastewater, avoiding the phenomenon of by-products produced when using chemical methods to purify industrial wastewater, and the industrial wastewater is circulated in the pipeline component through a negative pressure device, so that the magnetic aluminum-based adsorbent is fully in contact with various metal ions in the industrial wastewater, thereby improving the purification efficiency and purification effect, and a one-way valve is provided on the pipeline component to avoid the backflow of industrial wastewater and affect the purification efficiency and purification effect; further, the present invention uses the laser emitted by the laser transmitter to hit the granular polymer, so that the granular polymer reaches the metal plate A in the pipeline component and is adsorbed by the energized metal plate A, and the industrial wastewater in the pipeline component flows out after purification, thereby achieving the separation of the purified industrial wastewater and the granular polymer. The invention has a simple structure and low manufacturing cost, thereby reducing the purification cost.

[0063] 2. The one-way valve in the present invention adopts a Tesla valve. Compared with a traditional movable valve, the Tesla valve has a fixed geometric shape, which makes up for the disadvantage that traditional valves are easily damaged due to the need for movable parts. In addition, due to the design of its internal structure, the industrial wastewater expands in the valve body and then compresses, and the change in pressure difference is used to generate thrust, so that the industrial wastewater can be pushed out more quickly, thereby increasing the flow rate of the industrial wastewater, further improving the purification efficiency, reducing the residue of particulate polymers in the pipeline assembly, preventing the pipeline assembly from being blocked, and enabling the industrial wastewater and the pipeline assembly to be efficiently separated.

[0064] 3. The mixing control chip of the adsorbent dosing device in the present invention adopts a microfluidic chip, through which the magnetic aluminum-based adsorbent and ionized water can be precisely controlled and mixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0066] Figure 2 It is a cross-sectional view of the present invention. DETAILED DESCRIPTION

[0067] The present invention is further described below in conjunction with the accompanying drawings.

[0068] like Figure 1 and Figure 2 As shown, a microchannel magnetic adsorption light-driven purification device of the present invention includes a mounting frame, an adsorbent dosing device 1, a laser emitter 5, a pipeline assembly 7 and a negative pressure device 9.

[0069] The pipeline assembly 7 includes a main pipe 1, a main pipe 2, a vertical pipe 1, a vertical pipe 2, a connecting pipe and a one-way valve 4; the main pipe 1 and the main pipe 2 are arranged horizontally and coaxially, the outlet of the main pipe 1 and the inlet of the main pipe 2 are respectively fixed and connected with the inlet and outlet of the negative pressure device 9, and the negative pressure device 9 and the main pipe 2 are both fixed on the mounting frame, the inlet of the main pipe 1 and the outlet of the main pipe 2 are both provided with a control valve 2, and the opening and closing of the inlet of the main pipe 1 and the outlet of the main pipe 2 are controlled by the corresponding control valve 2; the lower ends of the vertical pipe 1 and the vertical pipe 2 arranged at intervals are respectively fixed and connected with the middle interfaces of the main pipe 1 and the main pipe 2, and the upper ends are respectively fixed and connected with one ends of two horizontally arranged connecting pipes through a turning joint, and the other ends of the two connecting pipes are respectively fixed and connected with the inlet and outlet of the one-way valve 4, and the inlet of the one-way valve 4 is closer to the outlet of the main pipe 2 than the outlet.

[0070] The adsorbent dosing device 1 is arranged on the mounting frame, and the liquid adding pipe outlet of the adsorbent dosing device 1 is fixed and connected to the liquid adding port opened on the main pipe 1; a laser emitter 5 is fixed on the main pipe 2 between the negative pressure device 9 and the vertical pipe 2, the emitting end of the laser emitter 5 faces downward, and a channel is opened on the main pipe 2 just below the emitting end of the laser emitter 5, a glass sheet is fixed in the channel, the glass sheet is used to allow the laser to pass through into the main pipe and prevent industrial wastewater from overflowing from the channel; a horizontal and symmetrically arranged metal plate A and a metal plate B are fixed in the main pipe 2 between the laser emitter 5 and the vertical pipe 2, and the metal plate B is located just above the metal plate A; a particle sensor 8 is provided on the main pipe 2 between the vertical pipe 2 and the control valve 2, and the particle sensor 8 is used to detect the concentration of particulate polymers in industrial wastewater. A particle concentration measuring device 6 is provided on the main pipe 1 between the liquid filling port and the vertical pipe 1, on the main pipe 2 between the laser emitter 5 and the metal plate A, and on the main pipe 2 between the particle sensor 8 and the corresponding control valve 2. The particle concentration measuring device 6 is used to detect the concentration of various metal ions in the industrial wastewater in the pipeline assembly 7.

[0071] Among them, the signal output ends of the particle sensor 8 and each particle concentration measuring device 6 are connected to the controller 3 provided on the mounting frame, and the control valve 2 is controlled by the controller 3; the particle concentration measuring device 6 can adopt a solution cathode glow discharge device disclosed in the patent with application number CN202020634026.2, and the ceramic tube, graphite tube and two magnets of the solution cathode glow discharge device are fixed on the main pipe one or the main pipe two, and the ceramic tube and the graphite tube are inserted into the main pipe one or the main pipe two; the one-way valve 4 adopts a Tesla valve. The Tesla valve utilizes the different flow resistances when the fluid passes through the valve in different directions, thereby realizing one-way circulation, preventing the backflow of industrial wastewater, and fixing the flow direction of industrial wastewater. Compared with the traditional movable valve, the Tesla valve has a fixed geometric shape, which makes up for the traditional valve. The Tesla valve has the disadvantage of easy damage of moving parts. Due to the design of its internal structure, the industrial wastewater expands in the valve body and then compresses, and the change in pressure difference is used to generate thrust, so that the industrial wastewater can be pushed out more quickly, thereby improving the flow rate of industrial wastewater, thereby improving the removal efficiency of various metal ions, reducing the residue of particulate polymers in the pipeline component 7, preventing blockage, and being able to efficiently separate particulate polymers; main pipe 1, main pipe 2, vertical pipe 1, vertical pipe 2 and each connecting pipe are made of 304 stainless steel pipes; the adsorbent dosing device 1 is provided with a magnetic aluminum-based adsorbent channel and an ion water channel, and the opening and closing of the switch valves in the two channels are controlled by a mixing control chip. The mixing control chip adopts a microfluidic chip, and the microfluidic chip can realize precise control and mixing of the magnetic aluminum-based adsorbent and ion water.

[0072] The present invention provides a purification method for a microchannel magnetic adsorption light-driven purification device, which is specifically as follows:

[0073] Step 1: connect the inlet of main pipe 1 to box 1 filled with industrial wastewater through a water pump and a water pipe, connect the outlet of main pipe 2 to the inlets of box 2 and box 3 respectively through a three-way valve and two outlet pipes, and put the prepared magnetic aluminum-based adsorbent and ionized water into the adsorbent dosing device 1; wherein, the preparation process of the magnetic aluminum-based adsorbent is as follows:

[0074] S1. Purify carbon black blocks and prepare carbon black particles with a diameter less than 1 μm: In a nitrogen environment with a concentration of 99.9%, use a ball mill to dry-grind carbon black blocks with a purity of 95% to obtain carbon black particles with a diameter less than 1 μm; use a heating device in a vacuum device to heat the carbon black particles, and extract the air in the vacuum device to reduce the pressure in the vacuum device to 75-85 Pa, and then pass 10 mg / m 3The chloroform in the vacuum device is used to exhaust the air to prevent the carbon black particles from reacting with oxygen. The heating temperature of the heating device is raised to 1000°C and maintained at this temperature for 5 minutes. Then the chloroform supply is cut off, and 99% pure nitrogen is introduced into the vacuum device for cooling. After waiting for 10 minutes, high-purity carbon black particles are obtained. When the carbon black blocks are dry-pulverized, the ball mill speed is set to 38r / min and the power is set to 18.5Kw; the optimal pressure value in the vacuum device is 80pa.

[0075] S2. Preparation of aluminate-aluminum-based adsorbent: 60 g of aluminate was dissolved in 1 L of water to prepare a 60% aluminate solution; 15 ml of 2 mol / L sodium hydroxide solution was added to the aluminate solution to generate aluminum hydroxide precipitation, and the pH value of the aluminate solution was adjusted to 3.1-3.4, and then 100 ml of 2 mol / L sodium hydroxide solution was added to the aluminate solution to adjust the pH value of the aluminate solution to 5.8-9.6; then 150 ml of 0.140 wt% oxalic acid was slowly added as an anti-hydration agent using a glass rod, and a magnetic stirrer was used to stir the mixture containing aluminum hydroxide and the anti-hydration agent. Stir, and let it stand for 0.5h after stirring is completed; use a pressure filtration device to perform vacuum filtration on the mixture one to obtain a precipitate one, use a sodium hydroxide solution with a concentration of 0.015mol / L to wash the precipitate one (sodium hydroxide is still surplus after the sodium hydroxide solution reacts with impurities in the precipitate one), and then use a secondary thermal desorption instrument to perform microwave desorption treatment on the washed precipitate one, and after the desorption treatment is completed, rinse the precipitate one with deionized water and dry it at 150°C; the precipitate one is washed, microwave desorbed and rinsed with deionized water for 3 times, and each repeated treatment lasts for 3h to obtain a product one; finally, a vacuum dryer is used to vacuum dry the product one to obtain an aluminate-aluminum-based adsorbent. Among them, when stirring, the stirring time of the magnetic stirrer is set to 30 minutes and the speed is set to 600r / min; when filtering, the filtration flow rate of the pressure filtration device is set to 0.5m / s, and the pressure is maintained at 80Pa; when desorption treatment is performed, the power of the secondary thermal analyzer is set to 500w, the temperature is set to 200℃, and the desorption time is set to 30min; when vacuum drying is performed, the drying time of the vacuum dryer is set to 30min, the pressure is set to 80Pa, and the power is set to 20kw; when adjusting the pH value of the aluminate solution for the second time, the optimal pH value of the aluminate solution is 8.

[0076] S3, preparation of magnetic powder: 10g of cobalt sulfate salt with a purity of 99% is dissolved in 1L of oxalic acid solution with a concentration of 0.1mol / L, and then cobalt oxalate with a concentration of 20wt% and nickel oxalate solution with a concentration of 20wt% are added until precipitate 2 is obtained, and then precipitate 2 is placed in a calcining furnace for calcination, and the calcining furnace is filled with nitrogen with a concentration of 99.9%, the calcination temperature is 300-350℃, the calcination time is 3-7h, and then product 2 is obtained, and then product 2 is rapidly cooled using liquid nitrogen with a purity of 99%, and then magnetically attracted by a neodymium iron boron magnet to obtain magnetic powder containing nickel and cobalt. Among them, the high-temperature anoxic decomposition principle of nickel oxalate and cobalt oxalate is: CoC2O4·2H2O+NiC2O4·2H2O→Ni+Co+4CO2+4H2O.

[0077] S4. Prepare a magnetic aluminum-based adsorbent by using the prepared carbon black particles, aluminate-aluminum-based adsorbent and magnetic powder: take 500g of aluminate-aluminum-based adsorbent, carbon black particles and a sodium hydroxide solution with a concentration of 9.09mol / L to form a mixture II, and the volume ratio of the aluminate-aluminum-based adsorbent, the carbon black particles and the sodium hydroxide solution is (50-60): (190-200): (190-200); then calcine the mixture II, and the calcination temperature is 400-600°C (the carbon black particles can be conductive carbon black, and its ignition temperature is usually between 350-380°C. It only plays a catalytic role in the calcination process and is basically burned after calcination), and the calcination time is 8h, thereby obtaining the product III ; Product three is cross-linked and mixed with magnetic powder by a cross-linking agent to form mixture three, and the cross-linking agent is methyl acrylate with a concentration of 96%, and the volume ratio of product three, cross-linking agent and magnetic powder is (130-150): (40-50): (90-100); Mixture three is placed in a calcining furnace for calcination to obtain product four, and the calcination temperature is 250-450°C and the calcination time is 2.5h; then product four is placed in concentrated sulfuric acid with a concentration of 18.4mol / L and a temperature of 30-60°C for activation treatment to enhance the magnetism, and finally the concentrated sulfuric acid on the surface of product four is washed with deionized water to obtain a magnetic aluminum-based adsorbent. After the magnetism is enhanced, even if the concentrated sulfuric acid is washed away, the magnetism of the magnetic aluminum-based adsorbent will no longer weaken. Among them, the optimal volume ratio of aluminate-aluminum-based adsorbent, carbon black particles and sodium hydroxide solution is 55:195:200; the optimal volume ratio of product three, cross-linking agent and magnetic powder is 140:45:100; the optimal calcination temperature of mixture three is 375°C; and the optimal operating temperature of concentrated sulfuric acid is 55°C.

[0078] Step 2, the control valve 2 located on the main pipe 1 is opened, the water pump is started, and the industrial wastewater of a preset volume 1 flows into the pipeline assembly 7, and then the water pump and the control valve 2 on the main pipe 1 are closed; then the adsorbent dosing device 1 uses ionized water and magnetic aluminum-based adsorbent to configure a magnetic aluminum-based adsorbent solution of a preset concentration, the flow valve on the liquid adding pipe of the adsorbent dosing device 1 is opened, and the liquid adding pump of the adsorbent dosing device 1 transports the configured magnetic aluminum-based adsorbent solution of a preset volume 2 to the main pipe 1 through the liquid adding pipe and the liquid adding port, and the flow valve on the liquid adding pipe is closed; the preset volume 2 of the magnetic aluminum-based adsorbent solution can be determined in advance by conducting experiments based on the preset volume 1 of the industrial wastewater flowing into the pipeline assembly 7; wait for 10 to 30 minutes, the magnetic aluminum-based adsorbent in the magnetic aluminum-based adsorbent solution adsorbs various metal ions in the industrial wastewater to form granular polymers, and the ion concentration measuring devices 6 measure the concentration of each metal ion in the industrial wastewater in the pipeline assembly 7 in real time.

[0079] Step 3, the negative pressure device 9 starts to work, and the industrial wastewater in the main pipe 1 is transported to the main pipe 2, and the industrial wastewater in the main pipe 2 is transported to the main pipe 1 through the vertical pipe 1, the vertical pipe 2, the two connecting pipes and the one-way valve 4, so that the industrial wastewater circulates in the pipeline assembly 7, thereby making the various metal ions in the industrial wastewater fully contact with the magnetic aluminum-based adsorbent; after waiting for 20 to 30 minutes, the laser emitter 5 emits laser.

[0080] Step 4: Power on metal plate A and metal plate B.

[0081] Step 5: When the industrial wastewater carrying the particulate polymer is transported from the negative pressure device 9 to the metal plate A, the laser hits the particulate polymer when the particulate polymer passes through the laser emitter 5, so that the particulate polymer reaches the metal plate A and is adsorbed on the metal plate A. A stable electric field is formed between the metal plate A and the metal plate B, and the metal plate A is the negative electrode and the metal plate B is the positive electrode, so that the particulate polymer adsorbed with metal ions is adsorbed on the metal plate A.

[0082] Step six, when each particle concentration measuring device 6 detects that the concentration of each metal ion in the industrial wastewater in the pipeline component 7 is lower than the respective preset concentration value (the preset concentration value of each metal ion must meet the national emission standard, such as the Ferroalloy Industrial Pollutant Emission Standard (GB_28666-2012)), and the particle sensor 8 detects that the total concentration of the particulate polymer and the magnetic aluminum-based adsorbent flowing in the industrial wastewater in the pipeline component 7 is lower than the preset value (the particulate polymer is adsorbed on the metal plate A), the industrial wastewater in the pipeline component 7 is purified, and the control valve 2 and the three-way valve on the main pipe 2 are opened, and the purified industrial wastewater flows from the main pipe 2 through the control valve 2, the three-way valve and a water outlet pipe into the box body 2.

[0083] Step 7: Repeat steps 2, 3, 5 and 6 until all industrial wastewater purification is completed, the laser emitter 5 and the negative pressure device 9 stop working, and the metal plate A and the metal plate B are powered off.

[0084] Among them, in step six, if after waiting for 10 to 30 minutes, the total concentration of particulate polymers and magnetic aluminum-based adsorbents in the industrial wastewater detected by the particle sensor 8 is always greater than the preset value, indicating that the adsorption effect of metal plate A on the particulate polymers is weakened, then the particulate polymers on the metal plate A are discharged once, and then return to step two; the discharge of the particulate polymers is as follows: the metal plate A and the metal plate B are powered off, the electric field disappears, the adsorption effect of the metal plate A on the particulate polymers disappears, the two control valves 2 are opened, and the outlet of the three-way valve is switched, the water pump works to transport the industrial wastewater to the main pipe one, the industrial wastewater flows from the main pipe one through the negative pressure device 9 into the main pipe two, and carries the particulate polymers that fall off the metal plate A in the main pipe two through the control valve 2, the three-way valve and another outlet pipe on the main pipe two into the box three, and finally the water pump, the negative pressure device 9 and the two control valves 2 are closed; and the industrial wastewater containing high concentrations of particulate polymers in the box three can be put into the box one after the particulate polymers are screened out (it can be poured manually or transported by another water pump).

[0085] In order to enable the particle polymer to accurately reach the metal plate A under the impact of the laser, the calculation process of the required laser intensity is as follows:

[0086] First, ignoring the negative pressure effect of the negative pressure device 9, the flow rate of the industrial wastewater in the second main pipe reaches a stable flow rate under the action of the natural pressure difference. The volume flow rate Q of the industrial wastewater in the second main pipe is

[0087]

[0088] Where ΔP nat is the natural pressure difference, and ΔP nat =ρ·g·h f , ρ is the density of industrial wastewater, which can be obtained by experimental measurement in advance (for example, using a density meter), h f is the head loss, and l is the distance from the inlet of main pipe 2 to the inlet of vertical pipe 2, R is the radius of main pipe 2, C is the pipe roughness coefficient of main pipe 2. In this example, the pipe roughness coefficient of main pipe 2 is 120, η eff is the effective viscosity of industrial wastewater, and η eff =η(1+2.5φ+6.2φ 2 )

[0089] , η is the viscosity of water, which can be obtained from the data or measured by a viscometer at the current temperature, φ is the total volume fraction of the particle polymer and the magnetic aluminum-based adsorbent, which can be measured by the particle sensor 8 before the metal plate A and the metal plate B are powered on in step 4, then

[0090]

[0091] The speed of industrial wastewater in main pipe 2 is

[0092]

[0093] After the negative pressure of the negative pressure device 9 is superimposed, the speed v of the industrial wastewater in the main pipe 2 is 水 =v1+v 初 , where v 初 is the initial velocity provided to the industrial wastewater when the negative pressure device 9 is working stably. In this embodiment, v 初 =1m / s;

[0094] The time for the particle polymer to travel from the laser emitter 5 to the metal plate A is equal to the horizontal distance between the laser emitter 5 and the metal plate A divided by the speed of the particle polymer in the horizontal direction. The speed of the particle polymer in the horizontal direction is consistent with the speed of the industrial wastewater in the main pipe 2. Assuming that the horizontal distance between the laser emitter 5 and the metal plate A is d, the time t for the particle polymer to travel from the laser emitter to the metal plate A is

[0095]

[0096] Assuming that the energy of the laser is completely absorbed when it acts on the particle polymer, that is, the energy reflection loss is negligible, the light pressure F of the laser acting on the particle polymer is 光 for

[0097]

[0098] Wherein, P is the light pressure (light intensity), I0 is the laser intensity, and c is the speed of light; r is the radius of the particle polymer, which is determined by the concentration of the magnetic aluminum-based adsorbent solution. In this embodiment, the concentration of the magnetic aluminum-based adsorbent solution is 50%, and the radius of the particle polymer is 20-50 nm, and the median value is taken during calculation; A1 is the area of ​​the particle polymer acted on by the laser, and the laser radius is greater than the radius of the particle polymer, then A1 is the area at the central cross section of the particle polymer.

[0099] The resistance F encountered by the granular polymer when it moves vertically in industrial wastewater 阻 (Stokes resistance) is

[0100] F 阻 =6πη eff rv y

[0101] In the formula, v y is the vertical velocity of the granular polymer when it moves toward the metal plate A;

[0102] Before the laser hits the particle polymer, the initial velocity of the particle polymer in the vertical direction is 0. After the laser hits the particle polymer, the particle polymer gains vertical acceleration, and the particle polymer accelerates in the vertical direction. 光 The size remains unchanged, F 阻 As the particle polymer speed increases, the particle polymer is subjected to the light pressure F according to the law of conservation of momentum. 光 and resistance F 阻 The kinetic equation of action is

[0103] m·Δv=(F 光 -F 阻 )·Δt

[0104] Where Δv is the velocity change within Δt, m is the mass of a single particle polymer, and ρ p To determine the density of the particulate polymer, an experiment can be conducted in advance, wherein the industrial wastewater of the preset volume one and the magnetic aluminum-based adsorbent solution of the preset volume two are mixed to obtain a mixed solution, and the density of the particulate polymer in the mixed solution is obtained by spectrophotometric analysis; during the spectrophotometric analysis, the molecules in each particulate polymer are acted upon by external photons to reach an excited state from a ground state, and then the spectrum emitted by the particulate polymer when the molecules in each particulate polymer return from the excited state to the ground state is collected, and then a spectral analysis is performed, and the mass concentration of the particulate polymer in the mixed solution is obtained according to the spectrum of the molecules in each particulate polymer, and then a preset volume of the mixed solution is taken, the mass of the particulate polymer in the preset volume of the mixed solution is calculated, and the number of particulate polymers in the mixed solution is calculated after photographing with a microscope camera, and the average mass of the particulate polymer is obtained, and then combined with the volume of the particulate polymer, the density of the particulate polymer is finally obtained;

[0105] When the light pressure F 光 With resistance F 阻 When equilibrium is reached, F 光 =F 阻 , the particle polymer no longer accelerates, and the velocity of the particle polymer in the vertical direction reaches a stable velocity v0, which is

[0106]

[0107] Since the laser action time is extremely short, it can be considered that the particle polymer quickly reaches equilibrium, and then the particle polymer is only affected by the viscous resistance of the fluid in the vertical direction, and the initial velocity of the particle polymer in the vertical direction is v0, so the particle polymer is subject to the resistance F in the vertical direction. 阻The kinetic equation of action is

[0108]

[0109] Assuming that the vertical movement time of the particle polymer is t1, then

[0110]

[0111] Assuming the vertical displacement of the particle polymer is y, then

[0112]

[0113] In order to make the particle polymer at the top of the second main tube reach the metal plate A in the vertical direction when t1=t, the displacement of the particle polymer at the top of the second main tube is the radius R of the second main tube, that is, y=R, then

[0114]

[0115] have to

[0116]

[0117] Then, the laser intensity I0 when the top particulate polymer of the main pipe 2 reaches the metal plate A in the vertical direction at t1=t is obtained as follows:

[0118]

[0119] It can be seen that η eff and ρ p Under known conditions, by setting the time for the particle polymer to travel from the laser emitter 5 to the metal plate A The required laser intensity can be calculated based on the radius R of the second main tube.

[0120] As a preferred solution, in order to make the laser hit as many particle polymers as possible and speed up the purification efficiency, the particle polymers can be concentrated in the center of the main pipe 2. The method for concentrating the particle polymers in the main pipe 2 is: the negative pressure device 9 generates a higher negative pressure in the central area of ​​the main pipe 2 and a lower negative pressure in the wall area of ​​the main pipe 2. At this time, the flow rate of the industrial wastewater in the central area of ​​the main pipe 2 is higher than the flow rate of the industrial wastewater in the wall area, thereby causing the particle polymers to gather in the central area of ​​the main pipe 2; wherein, the method for judging whether the particle polymers are concentrated in the center of the main pipe 2 is:

[0121] For spherical particles moving at low Reynolds numbers (i.e., very slow fluid flow or very small particles), the drag on the particle aggregate can be given by Stokes' law, which is

[0122] F drag =6πη eff r(vmax -v)

[0123] In the formula, v max is the flow velocity of industrial wastewater flowing along the main pipe 2 at the center of the main pipe 2, and v is the flow velocity of the granular polymer flowing along the main pipe 2;

[0124] The relaxation time is the time scale over which the particle velocity responds to changes in the fluid velocity and is defined as

[0125]

[0126] The Stokes number Stk is defined as the particle relaxation time τ p With the flow time scale τ f The flow time scale can be expressed as the ratio of the characteristic length L to the characteristic velocity U, then

[0127]

[0128] Right now

[0129]

[0130] For circular pipes, the characteristic length is taken as the radius R of the main pipe 2. This is because the industrial wastewater velocity is the largest at the center of the main pipe 2, and the radius of the main pipe 2 is the natural length scale for describing the behavior of industrial wastewater and particle polymers. The characteristic velocity U usually represents the characteristic velocity of industrial wastewater, and the flow velocity v of the industrial wastewater at the center of the main pipe 2 is taken as max Because the industrial wastewater flow rate is the largest in the center area of ​​pipeline 2, the inertial force of the particle polymer is also the largest, which directly affects the behavior of the particle polymer, especially when the particle polymer may deviate from the flow path.

[0131]

[0132] Stk is a value that reflects the relationship between the inertia of particulate polymers in industrial wastewater and fluid resistance. When Stk<1, the inertia of the particulate polymers is small and they can easily follow the flow of industrial wastewater. The particulate polymers can be effectively concentrated in the area with the highest flow velocity (i.e., the center of the second main pipe). When Stk>1, the inertia of the particulate polymers is large and they cannot closely follow the flow of industrial wastewater. They are prone to deviate and are difficult to concentrate in the center of the second main pipe.

[0133] The pressure difference ΔP generated by the negative pressure device 9 is

[0134]

[0135] In this embodiment, v maxTake the flow rate of industrial wastewater at the center of the second main pipe when Stk=0.15. At this time, the inertia of the granular polymer is small and can keep up with the flow of industrial wastewater while avoiding the instability caused by complete loss of inertia.

[0136] Among them, the magnetic aluminum-based adsorbent solution is configured with three concentrations, namely 30%, 50% and 80%. The magnetic aluminum-based adsorbent solution of each concentration in the preset volume 2 is used to perform multiple purification experiments on the industrial wastewater of the preset volume 1, and the average of each ion removal rate obtained is taken as the final ion removal rate. The purification results of the magnetic aluminum-based adsorbent solution of various concentrations are shown in Table 1. In addition, after the magnetic aluminum-based adsorbent solution of the preset volume 2 with the concentration of 30%, 50% and 80% is used to perform purification experiments on the industrial wastewater of the preset volume 1, the particle polymer radius distribution range can be measured by the microscope camera to be 20-35nm, 20-50nm and 20-60nm respectively.

[0137] Table 1 Purification effect of three concentrations of magnetic aluminum-based adsorbent solution

[0138]

[0139]

Claims

1. A microchannel magnetic adsorption light-driven purification device, comprising a mounting frame, an adsorbent dosing device and a pipeline assembly, characterized in that: It also includes a laser emitter and a negative pressure device; the pipeline assembly includes a main pipe 1, a main pipe 2, a vertical pipe 1, a vertical pipe 2, a connecting pipe and a one-way valve; the main pipe 1 and the main pipe 2 are arranged horizontally and coaxially, the outlet of the main pipe 1 and the inlet of the main pipe 2 are respectively fixed and connected with the inlet and outlet of the negative pressure device, and the negative pressure device and the main pipe 2 are both fixed on the mounting frame, and the inlet of the main pipe 1 and the outlet of the main pipe 2 are both provided with control valves; the lower ends of the vertical pipe 1 and the vertical pipe 2 arranged at intervals are respectively fixed and connected with the middle interfaces of the main pipe 1 and the main pipe 2, and the upper ends are respectively fixed and connected with one end of two horizontally arranged connecting pipes through a turning joint, and the other ends of the two connecting pipes are respectively fixed and connected with the inlet and outlet of the one-way valve, and the inlet of the one-way valve is closer to the outlet of the main pipe 2 than the outlet; The adsorbent dosing device is arranged on the mounting frame, and the outlet of the liquid adding pipe of the adsorbent dosing device is fixed to and communicated with the liquid adding port provided on the main pipe 1; a laser emitter is fixed on the main pipe 2 between the negative pressure device and the vertical pipe 2, the emitting end of the laser emitter faces downward, and a channel is provided on the main pipe 2 directly below the emitting end of the laser emitter, and a glass sheet is fixed in the channel; a metal plate A and a metal plate B are fixed in the main pipe 2 between the laser emitter and the vertical pipe 2, and the metal plate B is located directly above the metal plate A; a particle sensor is provided on the main pipe 2 between the vertical pipe 2 and the control valve; a particle concentration measuring device is provided between the liquid adding port and the vertical pipe 1 on the main pipe 1, between the laser emitter and the metal plate A on the main pipe 2, and between the particle sensor and the corresponding control valve on the main pipe 2.

2. A microchannel magnetic adsorption light-driven purification device according to claim 1, characterized in that: The one-way valve adopts a Tesla valve.

3. A microchannel magnetic adsorption light-driven purification device according to claim 1, characterized in that: The adsorbent dosing device is provided with a magnetic aluminum-based adsorbent channel and an ion water channel, and the opening and closing of switch valves in the two channels are controlled by a mixing control chip, and the mixing control chip adopts a microfluidic chip.

4. A purification method for a microchannel magnetic adsorption light-driven purification device according to any one of claims 1 to 3, characterized in that: The details are as follows: Step 1: connect the inlet of main pipe 1 to box 1 filled with industrial wastewater through a water pump and a water pipe, connect the outlet of main pipe 2 to the inlets of box 2 and box 3 respectively through a three-way valve and two outlet pipes, and put the magnetic aluminum-based adsorbent and ionized water into the adsorbent dosing device; Step 2: open the control valve on the main pipe 1, start the water pump, and make the industrial wastewater of preset volume 1 flow into the pipeline assembly, and then close the water pump and the control valve on the main pipe 1; then the adsorbent dosing device uses ionized water and magnetic aluminum-based adsorbent to configure a magnetic aluminum-based adsorbent solution of preset concentration, the flow valve on the liquid adding pipe of the adsorbent dosing device is opened, and the liquid adding pump of the adsorbent dosing device transports the configured magnetic aluminum-based adsorbent solution of preset volume 2 to the main pipe 1 through the liquid adding pipe and the liquid adding port, and the flow valve on the liquid adding pipe is closed; wait for a preset time 1, the magnetic aluminum-based adsorbent in the magnetic aluminum-based adsorbent solution adsorbs various metal ions in the industrial wastewater and forms a granular polymer, and each ion concentration measuring device measures the concentration of each metal ion in the industrial wastewater in the pipeline assembly in real time; Step 3: The negative pressure device starts to work, transporting the industrial wastewater in the main pipe 1 to the main pipe 2, and transporting the industrial wastewater in the main pipe 2 to the main pipe 1 through the vertical pipe 1, the vertical pipe 2, the two connecting pipes and the one-way valve, so that the industrial wastewater circulates in the pipeline assembly. After waiting for the preset time 2, the laser transmitter emits the laser; Step 4: Power on metal plate A and metal plate B; Step 5. During the process of industrial wastewater carrying particulate polymers from the negative pressure device to the metal plate A, when the particulate polymers pass through the laser emitter, the laser hits the particulate polymers, causing the particulate polymers to reach the metal plate A and be adsorbed on the metal plate A; Step 6: When each particle concentration measuring device detects that the concentration of each metal ion in the industrial wastewater in the pipeline assembly is lower than the respective preset concentration value, and the particle sensor detects that the total concentration of the particle polymer and the magnetic aluminum-based adsorbent flowing in the industrial wastewater in the pipeline assembly is lower than the preset value, the industrial wastewater in the pipeline assembly is purified, and the control valve and the three-way valve on the main pipe 2 are opened, and the purified industrial wastewater flows from the main pipe 2 through the control valve, the three-way valve and an outlet pipe into the box body 2; Step 7: Repeat Step 2, Step 3, Step 5 and Step 6 until all industrial wastewater purification is completed, the laser emitter and the negative pressure device stop working, and the metal plate A and the metal plate B are powered off.

5. The purification method of a microchannel magnetic adsorption light-driven purification device according to claim 4, characterized in that: In step six, if after waiting for 10 to 30 minutes, the total concentration of particulate polymers and magnetic aluminum-based adsorbents in the industrial wastewater detected by the particle sensor is always greater than the preset value, the particulate polymers on the metal plate A are discharged once, and then the process returns to step two; the discharge of the particulate polymers is as follows: the metal plate A and the metal plate B are powered off, the adsorption effect of the metal plate A on the particulate polymers disappears, the two control valves are opened, and the outlet of the three-way valve is switched, the water pump works to transport the industrial wastewater to the main pipe one, the industrial wastewater flows from the main pipe one through the negative pressure device into the main pipe two, and carries the particulate polymers that have fallen off the metal plate A in the main pipe two through the control valve, the three-way valve and another outlet pipe on the main pipe two into the box three, and finally the water pump, the negative pressure device and the two control valves are turned off.

6. The purification method of a microchannel magnetic adsorption light-driven purification device according to claim 4, characterized in that: The preparation process of the magnetic aluminum-based adsorbent is as follows: S1, purifying carbon black blocks and preparing carbon black particles with a diameter less than 1 μm; S2, preparing aluminate-aluminum-based adsorbent; S3, preparing magnetic powder containing nickel and cobalt; S4. Prepare a magnetic aluminum-based adsorbent by using the prepared carbon black particles, aluminate-aluminum-based adsorbent and magnetic powder.

7. The purification method of a microchannel magnetic adsorption light-driven purification device according to claim 6, characterized in that: The process of S2 is as follows: 60 g of aluminate is dissolved in 1 L of water to prepare a 60% aluminate solution; 15 ml of a 2 mol / L sodium hydroxide solution is added to the aluminate solution to generate aluminum hydroxide precipitation, and the pH value of the aluminate solution is adjusted to 3.1-3.4; 100 ml of a 2 mol / L sodium hydroxide solution is added to the aluminate solution to adjust the pH value of the aluminate solution to 5.8-9.6; then 150 ml of 0.140 wt% oxalic acid is slowly added as an anti-hydration agent using a glass rod, and a magnetic stirrer is used to stir the mixture containing aluminum hydroxide and anti-hydration agent. The mixture of the mixture is stirred and allowed to stand for 0.5 h after stirring is completed; the mixture is filtered under reduced pressure using a pressure filter to obtain a precipitate, the precipitate is washed with a sodium hydroxide solution having a concentration of 0.015 mol / L, and the washed precipitate is subjected to microwave desorption treatment using a secondary thermal analyzer, and after the desorption treatment is completed, the precipitate is rinsed with deionized water and dried at 150°C; the precipitate is washed, microwave desorbed and rinsed with deionized water for 3 times, and each repeated treatment lasts for 3 h to obtain a product; finally, the product is vacuum dried using a vacuum dryer to obtain an aluminate-aluminum-based adsorbent.

8. The purification method of a microchannel magnetic adsorption light-driven purification device according to claim 6, characterized in that: The specific process of S3 is as follows: dissolving 10 g of 99% pure cobalt sulfate salt in 1 L of 0.1 mol / L oxalic acid solution, then adding 20 wt% cobalt oxalate solution and 20 wt% nickel oxalate solution until a precipitate 2 is obtained, and then placing the precipitate 2 in a calcining furnace for calcination, and the calcining furnace is filled with 99.9% nitrogen, the calcination temperature is 300-350°C, the calcination time is 3-7h, and then obtaining a product 2, and then cooling the product 2 with 99% pure liquid nitrogen, and then magnetically attracting it with a neodymium iron boron magnet to obtain a magnetic powder containing nickel and cobalt.

9. The purification method of a microchannel magnetic adsorption light-driven purification device according to claim 6, characterized in that: The process of S4 is as follows: 500 g of aluminate-aluminum-based adsorbent is mixed with carbon black particles and a sodium hydroxide solution with a concentration of 9.09 mol / L to form a mixture II, and the volume ratio of the aluminate-aluminum-based adsorbent, the carbon black particles and the sodium hydroxide solution is (50-60): (190-200): (190-200); then the mixture II is calcined at a calcination temperature of 400-600° C. for 8 hours to obtain a product III; the product III is cross-linked and mixed with a magnetic powder by a cross-linking agent to form a mixture III, The cross-linking agent is selected as methyl olefinate with a concentration of 96%, and the volume ratio of product three, cross-linking agent and magnetic powder is (130-150): (40-50): (90-100); the mixture three is placed in a calcining furnace for calcination to obtain product four, and the calcination temperature is 250-450°C and the calcination time is 2.5h; then the product four is placed in concentrated sulfuric acid with a concentration of 18.4mol / L and a temperature of 30-60°C for activation treatment; finally, the concentrated sulfuric acid on the surface of the product four is washed with deionized water to obtain a magnetic aluminum-based adsorbent.

10. The purification method of a microchannel magnetic adsorption light-driven purification device according to claim 4, characterized in that: The calculation process of the laser intensity when the particle polymer reaches the metal plate A under the impact of the laser is: First, ignoring the negative pressure effect of the negative pressure device, the volume flow rate Q of the industrial wastewater in the main No. 2 pipeline under the action of natural pressure difference is: Where ΔP nat is the natural pressure difference, and ΔP nat =ρ·g·h f , ρ is the density of industrial wastewater, h f is the head loss, and l is the distance from the inlet of main pipe 2 to the inlet of vertical pipe 2, R is the radius of main pipe 2, C is the pipe roughness coefficient of main pipe 2, η eff is the effective viscosity of industrial wastewater, then The speed of industrial wastewater in main pipe 2 is After the negative pressure of the negative pressure device is superimposed, the speed of industrial wastewater in the main pipe 2 is v 水 =v1+v 初 , where v 初 The initial velocity provided by the negative pressure device to the industrial wastewater; The time for the particle polymer to travel from the laser emitter to the metal plate A is equal to the horizontal distance between the laser emitter and the metal plate A divided by the speed of the particle polymer in the horizontal direction. The speed of the particle polymer in the horizontal direction is consistent with the speed of the industrial wastewater in the main pipe 2. Assuming that the horizontal distance between the laser emitter and the metal plate A is d, the time t for the particle polymer to travel from the laser emitter to the metal plate A is Assuming that the energy of the laser is completely absorbed when it acts on the particle polymer, that is, the energy reflection loss is negligible, the light pressure F of the laser acting on the particle polymer is 光 for Where P is the light pressure, I0 is the laser intensity, c is the light speed, r is the radius of the particle polymer, and A1 is the area where the laser acts on the particle polymer; The resistance F encountered by the granular polymer when it moves vertically in industrial wastewater 阻 for F 阻 =6πι eff RV y In the formula, v y is the vertical velocity of the granular polymer when it moves toward the metal plate A; Before the laser hits the particle polymer, the initial velocity of the particle polymer in the vertical direction is 0. After the laser hits the particle polymer, the particle polymer gains vertical acceleration, and the particle polymer accelerates in the vertical direction. 光 The size remains unchanged, F 阻 As the particle polymer speed increases, the particle polymer is subjected to the light pressure F according to the law of conservation of momentum. 光 and resistance F 阻 The kinetic equation of action is m·Δv=(F 光 -F 阻 )·Δt Where Δv is the velocity change within Δt, m is the mass of a single particle polymer, and ρ p is the density of the particle polymer; When the light pressure F 光 With resistance F 阻 When equilibrium is reached, F 光 =F 阻 , the particle polymer no longer accelerates, and the velocity of the particle polymer in the vertical direction is After the laser hits the particle polymer, the initial velocity of the particle polymer in the vertical direction is v0, and then the particle polymer is only subject to the resistance F in the vertical direction. 阻 The particle polymer is subject to resistance F in the vertical direction. 阻 The kinetic equation of action is Assuming that the vertical movement time of the particle polymer is t1, then Assuming the vertical displacement of the particle polymer is y, then In order to make the particle polymer at the top of the second main tube reach the metal plate A in the vertical direction when t1=t, the displacement of the particle polymer at the top of the second main tube is the radius R of the second main tube, that is, y=R, then have to Then, the laser intensity I0 when the top particulate polymer of the main pipe 2 reaches the metal plate A in the vertical direction at t1=t is obtained as follows:

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