A wax model cleaning wastewater recycling process

Abstract

The invention discloses a wax mold cleaning wastewater recycling process, which belongs to the technical field of wastewater treatment. The invention comprises the following steps: collecting the wax mold cleaning wastewater in a first water collection tank, then injecting it into a cooling tower through a water pump for cooling, injecting sewage in the cooling tower into an air flotation machine, separating wax and water through the air flotation machine to obtain floating wax and pre-treated wastewater, and the pre-treated wastewater enters a second collecting tank; adding caustic soda flakes and slaked lime to the second collecting tank to adjust pH, then adding an enhanced water treatment agent, stirring and mixing for 30-60 minutes, standing for 1-2 hours, and then transporting the precipitate to a filter press through a pipeline, and returning the clear liquid to a production line for reuse. The wax mold cleaning wastewater recycling process provided by the invention effectively treats the wastewater, has a high resource utilization rate, does not generate secondary waste liquid, saves production costs and management expenses, and has high application value in enterprises.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and particularly relates to a process for recycling the wastewater from wax mold cleaning. Background Art

[0002] The precision casting industry is a major energy-consuming sector in the machinery industry, with high energy consumption, low energy utilization rate, serious pollution, and poor economic benefits, which restricts the development of the precision manufacturing industry. The key is to solve the problem of wastewater treatment. Among them, precision casting wax molds are the main accessories used in precision casting. After the wax molds are made, they need to be cleaned. If the wax molds are not cleaned thoroughly, it will directly affect the slurry hanging problem of the subsequent wax mold coating layer. The presence of wax chips or oil stains on the surface of the wax mold will directly cause the slurry to not stick or partially not stick to the wax mold surface layer, indirectly resulting in burrs on the surface of the casting or too poor surface finish of the casting.

[0003] At present, wax molds are usually cleaned with water-based wax mold cleaning agents. The water-based wax mold cleaning agents are composed of various surfactants, including anionic surfactants, cationic surfactants, and zwitterionic surfactants, etc. The composition is relatively complex, resulting in a relatively high content of organic pollutants in the wastewater from wax mold cleaning. It is difficult to meet the discharge standards without treatment. Moreover, wax chips, oil stains, and reagents such as curing agents and mold release agents used in wax mold forming will be introduced during the wax mold cleaning process. For the treatment of such wastewater, currently, the core treatment process of coagulation and precipitation is widely used. For example, coagulation and precipitation tests are carried out using coagulants such as ferric trichloride, alum, polyaluminum chloride (PAC), carbide slag (CaC 2 )), lime, ferrous sulfate, etc. However, no matter which coagulant is selected, there is a problem that the wastewater purification effect is not good, and the wax chips in the wastewater are not recycled, resulting in waste of materials. Based on the above problems, it is necessary to provide a process for recycling the wastewater from wax mold cleaning. Summary of the Invention

[0004] The purpose of the present invention is to provide a process for recycling the wastewater from wax mold cleaning to solve the problems in the background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A process for recycling the wastewater from wax mold cleaning includes the following steps:

[0007] First step: Collect the wastewater from wax mold cleaning in the first collection tank, then inject it into the cooling tower through a water suction pipe for cooling. Inject the sewage in the cooling tower into the air flotation machine, and separate the wax and water through the air flotation machine to obtain floating wax and pretreated wastewater. The floating wax is collected and recycled, and the pretreated wastewater enters the second collection tank;

[0008] Step 2: Add caustic soda and slaked lime to the second collection pool to adjust the pH to 8-9, and then add an enhanced water treatment agent. Stir and mix for 30-60 minutes under the condition of a rotation speed of 50-100 r / min. After standing for 1-2 hours, the precipitate is transported to a filter press through a pipeline, and the clear liquid is refluxed to the production line for reuse.

[0009] Further, the temperature of the wastewater treated by the cooling tower is 15-24 °C.

[0010] Further, the filtrate of the filter press enters the second collection pool for recycling, and the filter cake is transported out.

[0011] Further, the mass ratio of caustic soda to slaked lime is 0.3-1:0.5-1, and the dosage ratio of the enhanced water treatment agent to the pretreated wastewater is 0.8-1.2 mg / L.

[0012] Further, the enhanced water treatment agent is prepared through the following steps:

[0013] Add acrylamide, crosslinkable potassium ferrate, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride, and gallic acid monomers to an organic mixed solvent. Purge with nitrogen to remove oxygen for 10-30 minutes, add an initiator solution, react at a temperature of 70-90 °C, stir and react for 3-7 hours. After the reaction is completed, filter, wash the filtrate with deionized water 3-5 times, and dry to obtain the enhanced water treatment agent.

[0014] Among them, the mass ratio of acrylamide, crosslinkable potassium ferrate, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride, and gallic acid monomers is 4-6:10-20:2-3:2-3:2-3. The dosage of the initiator is 0.1-0.5% of the total mass of acrylamide, crosslinkable potassium ferrate, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride, and gallic acid monomers. The initiator is azobisisobutyronitrile. The organic mixed solvent is composed of anhydrous ethanol and butyl acetate according to a volume ratio of 7-9:1-3. The initiator solution is an azobisisobutyronitrile ethanol solution with a mass fraction of 3-5%. Using crosslinkable potassium ferrate as the core, acrylamide as the reaction monomer, 2-acrylamido-2-methylpropanesulfonic acid as the anionic monomer, methacryloyloxyethyl trimethyl ammonium chloride as the cationic monomer, and gallic acid monomers as the enhancer, introduce enhanced polyacrylamide on the surface of crosslinkable potassium ferrate to obtain the enhanced water treatment agent. When added to the wax mold cleaning wastewater, it can not only slowly release potassium ferrate and continuously play the purification role of potassium ferrate, but also the anionic groups, cationic groups, phenol and other groups on the surface play the adsorption and flocculation roles of polyacrylamide through electrostatic interaction, π-π stacking and other methods, so that the suspended substances quickly aggregate and settle, and efficiently remove the pollutants in the wax mold cleaning wastewater.

[0015] Furthermore, crosslinkable potassium ferrate is prepared through the following steps:

[0016] Step S1: Place β-cyclodextrin in a flask, add deionized water and stir to obtain an aqueous β-cyclodextrin solution. After heating to 50 - 60 °C and gelatinizing for 20 - 40 min, add potassium ferrate to the flask while stirring. Continue stirring for 30 min, then cool to room temperature, filter, vacuum dry, grind and pass through a 200-mesh sieve to obtain potassium ferrate-coated microspheres;

[0017] Step S2: Place the potassium ferrate-coated microspheres in anhydrous DMSO, stir for 10 - 20 min, then add sodium hydroxide. Stir at room temperature for 1 h, then cool to 5 - 10 °C. While stirring, dropwise add allyl bromide. Under the condition of a rotation speed of 200 - 300 r / min, stir and react for 48 h. After the reaction is completed, let it stand for 2 h, concentrate under reduced pressure to 1 / 3 of the original volume. Wash the concentrated product with acetone 3 - 5 times, filter by suction and dry to obtain crosslinkable potassium ferrate.

[0018] Potassium ferrate is an inorganic substance with the chemical formula K 2 FeO 4 , which is a new type of non-chlorine green disinfectant with high efficiency and multiple functions. It can effectively inhibit and kill various bacteria and viruses, and can effectively eliminate organic and inorganic substances in water. However, its stability is poor and it easily reacts with moisture and reducing components in the air. Based on this, the present invention first uses β-cyclodextrin to coat it to obtain potassium ferrate-coated microspheres. Through the coating treatment, firstly, the utilization efficiency of potassium ferrate is improved, avoiding self-decomposition due to its low stability; secondly, potassium ferrate can maintain effective dissolution for a long time, extending its oxidation time and improving the oxidation efficiency; thirdly, the cost of oxidation and decontamination is reduced, the number of drug additions is reduced, and the maintenance and management costs are reduced to obtain potassium ferrate-coated microspheres. Then, under alkaline conditions, the hydroxyl groups (hydrophilic groups carried by β-cyclodextrin itself) on the surface of the potassium ferrate-coated microspheres react with allyl bromide to eliminate hydrogen bromide, introducing allyl groups on the surface of the potassium ferrate-coated microspheres and endowing it with crosslinkable characteristics, laying a foundation for the subsequent preparation of enhanced water treatment agents.

[0019] Furthermore, in step S1, the mass ratio of β-cyclodextrin, deionized water and potassium ferrate is 1:10 - 20:0.2 - 0.4.

[0020] Furthermore, in step S2, the dosage ratio of potassium ferrate-coated microspheres, anhydrous DMSO, sodium hydroxide and allyl bromide is 5 - 6 g:60 - 80 mL:3.5 - 4.7 g:2.6 - 3.6 g.

[0021] Furthermore, gallic acid monomer is prepared through the following steps:

[0022] Propyl gallate, allyl alcohol, p-toluenesulfonic acid, and N,N-dimethylformamide were added to a flask. The temperature was raised to 125 °C, and the mixture was stirred and reacted for 3 - 5 h. After the reaction, N,N-dimethylformamide was removed by rotary evaporation to obtain the gallic acid monomer. The molar ratio of propyl gallate to allyl alcohol was 1:1, the dosage of p-toluenesulfonic acid was 2 - 3% of the total mass of propyl gallate and allyl alcohol, and the dosage of N,N-dimethylformamide was 5 - 10 times the total mass of propyl gallate and allyl alcohol. Using propyl gallate and allyl alcohol as reaction substrates, a gallic acid monomer containing a pyrogallol group and an allyl group was obtained through transesterification reaction.

[0023] Advantages of the present invention:

[0024] 1. The present invention provides a process for recycling waste water from wax mold cleaning. The waste water from wax mold cleaning is cooled and subjected to air flotation treatment. Using the physical properties (freezing point, density) of wax, it is separated from the waste water for recycling, reducing resource waste. The pretreated waste water obtained after removing wax enters the second collection tank, and through the action of an enhanced water treatment agent for oxidation, adsorption, flocculation, etc., the pollutants in the pretreated waste water are removed. The precipitation is treated by a filter press. The filtrate of the filter press flows into the second collection tank for cyclic treatment, and the filter cake is transported out, while the clear water returns to the production line and continues to be used as circulating clear water to prepare for wax mold cleaning. In summary, for the process for recycling waste water from wax mold cleaning provided by the present invention, the waste water is effectively treated, the resource utilization rate is high, no secondary waste liquid is generated, the production cost and management cost are saved, and it has high application value in enterprises.

[0025] 2. The present invention provides an enhanced water treatment agent. Using crosslinkable potassium ferrate as the core, acrylamide as the reaction monomer, 2-acrylamido-2-methylpropanesulfonic acid as the anionic monomer, methacryloyloxyethyl trimethyl ammonium chloride as the cationic monomer, and gallic acid monomer as the enhancer, an enhanced polyacrylamide is introduced onto the surface of crosslinkable potassium ferrate, thus obtaining the enhanced water treatment agent. When it is added to the waste water from wax mold cleaning, it can not only slowly release potassium ferrate and continuously play the purification role of potassium ferrate, but also the anionic groups, cationic groups, phenol groups, etc. on its surface play the adsorption and flocculation roles of polyacrylamide through electrostatic interaction, π-π stacking interaction, etc., enabling the suspended substances to quickly aggregate and settle, and efficiently removing the pollutants in the waste water from wax mold cleaning. Description of the Drawings

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 It is a flow chart of a process for recycling waste water from wax mold cleaning according to the present invention. Detailed Embodiments

[0028] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0029] Example 1

[0030] A crosslinkable potassium ferrate is prepared by the following steps:

[0031] Step S1: Place 1 g of β-cyclodextrin in a flask, add 10 g of deionized water and stir to obtain a β-cyclodextrin aqueous solution. After heating to 50 °C and gelatinizing for 20 min, while stirring, add 0.2 g of potassium ferrate to the flask, continue stirring for 30 min, then cool to room temperature, filter, vacuum dry, grind and pass through a 200-mesh sieve to obtain potassium ferrate-coated microspheres;

[0032] Step S2: Place 5 g of potassium ferrate-coated microspheres in 60 mL of anhydrous DMSO, stir for 10 min, add 3.5 g of sodium hydroxide, stir at room temperature for 1 h, then cool to 5 °C, while stirring, dropwise add 2.6 g of allyl bromide, and stir and react for 48 h under the condition of a rotation speed of 200 r / min. After the reaction is completed, let it stand for 2 h, concentrate under reduced pressure to 1 / 3 of the original volume, wash the concentrated product with acetone 3 times, filter by suction and dry to obtain crosslinkable potassium ferrate.

[0033] Example 2

[0034] A crosslinkable potassium ferrate is prepared by the following steps:

[0035] Step S1: Place 1 g of β-cyclodextrin in a flask, add 20 g of deionized water and stir to obtain a β-cyclodextrin aqueous solution. After heating to 60 °C and gelatinizing for 40 min, while stirring, add 0.4 g of potassium ferrate to the flask, continue stirring for 30 min, then cool to room temperature, filter, vacuum dry, grind and pass through a 200-mesh sieve to obtain potassium ferrate-coated microspheres;

[0036] Step S2: Place 6 g of potassium ferrate-coated microspheres in 80 mL of anhydrous DMSO, stir for 20 min, add 4.7 g of sodium hydroxide, stir at room temperature for 1 h, then cool to 10 °C, while stirring, dropwise add 3.6 g of allyl bromide, and stir and react for 48 h under the condition of a rotation speed of 300 r / min. After the reaction is completed, let it stand for 2 h, concentrate under reduced pressure to 1 / 3 of the original volume, wash the concentrated product with acetone 5 times, filter by suction and dry to obtain crosslinkable potassium ferrate.

[0037] Example 3

[0038] A strengthened water treatment agent is prepared through the following steps:

[0039] 4 g of acrylamide, 10 g of the crosslinkable potassium ferrate of Example 1, 2 g of 2-acrylamido-2-methylpropanesulfonic acid, 2 g of methacryloyloxyethyl trimethyl ammonium chloride, and 2 g of gallic acid monomer are added to 500 mL of an organic mixed solvent. Nitrogen is passed through to remove oxygen for 10 min, and then an initiator solution is added. The temperature is 70 °C, and stirring reaction is carried out for 3 h. After the reaction ends, filtration is carried out, and the filtrate is washed 3 times with deionized water and then dried to obtain the strengthened water treatment agent. The dosage of the initiator is 0.1% of the total mass of acrylamide, crosslinkable potassium ferrate, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride, and gallic acid monomer. The initiator is azobisisobutyronitrile, the organic mixed solvent is composed of absolute ethanol and butyl acetate in a volume ratio of 9:1, and the initiator solution is an azobisisobutyronitrile ethanol solution with a mass fraction of 3%.

[0040] The gallic acid monomer is prepared through the following steps:

[0041] 0.1 mol of propyl gallate, 0.1 mol of allyl alcohol, p-toluenesulfonic acid, and N,N-dimethylformamide are added to a flask. The temperature is raised to 125 °C, and stirring reaction is carried out for 3 h. After the reaction ends, N,N-dimethylformamide is removed by rotary evaporation to obtain the gallic acid monomer. The dosage of p-toluenesulfonic acid is 2% of the total mass of propyl gallate and allyl alcohol, and the dosage of N,N-dimethylformamide is 5 times the total mass of propyl gallate and allyl alcohol.

[0042] Example 4

[0043] A strengthened water treatment agent is prepared through the following steps:

[0044] 6 g of acrylamide, 20 g of the crosslinkable potassium ferrate of Example 2, 3 g of 2-acrylamido-2-methylpropanesulfonic acid, 3 g of methacryloyloxyethyl trimethyl ammonium chloride, and 3 g of gallic acid monomer are added to 500 mL of an organic mixed solvent. Nitrogen is passed through to remove oxygen for 30 min, and then an initiator solution is added. The temperature is 90 °C, and stirring reaction is carried out for 7 h. After the reaction ends, filtration is carried out, and the filtrate is washed 5 times with deionized water and then dried to obtain the strengthened water treatment agent. The dosage of the initiator is 0.5% of the total mass of acrylamide, crosslinkable potassium ferrate, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride, and gallic acid monomer. The initiator is azobisisobutyronitrile, the organic mixed solvent is composed of absolute ethanol and butyl acetate in a volume ratio of 7:3, and the initiator solution is an azobisisobutyronitrile ethanol solution with a mass fraction of 5%.

[0045] The gallic acid monomer is prepared through the following steps:

[0046] Add 0.1 mol of propyl gallate, 0.1 mol of allyl alcohol, p-toluenesulfonic acid, and N,N-dimethylformamide into a flask, heat up to 125 °C, stir and react for 5 h. After the reaction is completed, rotary evaporate to remove N,N-dimethylformamide to obtain the gallic acid monomer. The dosage of p-toluenesulfonic acid is 3% of the total mass of propyl gallate and allyl alcohol, and the dosage of N,N-dimethylformamide is 10 times the total mass of propyl gallate and allyl alcohol.

[0047] Comparative Example 1

[0048] This comparative example provides a strengthened water treatment agent. Compared with Example 3, remove the gallic acid monomer in Example 3, and the other raw materials and preparation methods are the same as those in Example 3.

[0049] Comparative Example 2

[0050] This comparative example is a two-phase ionic polyacrylamide sewage treatment agent sold by Hengda Chemical Co., Ltd. in Taiqian County.

[0051] Example 5

[0052] Please refer to Figure 1 , a process for recycling waste water from wax mold cleaning, which includes the following steps:

[0053] First step: Collect the waste water from wax mold cleaning in the first collecting pool, then inject it into the cooling tower through a suction pipe for cooling. Inject the sewage in the cooling tower into the air flotation machine to separate the wax from the water through the air flotation machine, obtaining floating wax and pretreated waste water. The floating wax is collected and recycled, and the pretreated waste water enters the second collecting pool;

[0054] Second step: Add caustic soda and slaked lime to the second collecting pool to adjust the pH to 8, then add the strengthened water treatment agent of Example 3. Under the condition of a rotation speed of 50 r / min, stir and mix for 30 min. After standing for 1 h, the precipitate is transported to the filter press through a pipeline, and the clear liquid flows back to the production line for reuse.

[0055] Among them, the temperature of the waste water treated by the cooling tower is 15 °C. The filtrate of the filter press enters the second collecting pool for recycling, and the filter cake is transported out. The mass ratio of caustic soda to slaked lime is 0.3:0.5, and the dosage ratio of the strengthened water treatment agent to the pretreated waste water is 0.8 mg / L.

[0056] Example 6

[0057] Please refer to Figure 1 , a process for recycling waste water from wax mold cleaning, which includes the following steps:

[0058] Step 1: Collect the waste water from wax mold cleaning in the first collection tank, then inject it into the cooling tower through the suction pipe for cooling. Inject the sewage in the cooling tower into the air flotation machine, and separate the wax from the water through the air flotation machine to obtain floating wax and pretreated waste water. The floating wax is collected and recycled, and the pretreated waste water enters the second collection tank;

[0059] Step 2: Add caustic soda and slaked lime to the second collection tank to adjust the pH to 8, add the enhanced water treatment agent of Example 3, and stir and mix for 50 min under the condition of a rotation speed of 60 r / min. After standing for 1.5 h, the precipitate is transported to the filter press through a pipeline, and the clear liquid is refluxed to the production line for reuse.

[0060] Among them, the temperature of the waste water treated by the cooling tower is 20 °C. The filtrate of the filter press enters the second collection tank for recycling, and the filter cake is transported out. The mass ratio of caustic soda to slaked lime is 0.5:0.8, and the dosage ratio of the enhanced water treatment agent to the pretreated waste water is 1.0 mg / L.

[0061] Example 7

[0062] Please refer to Figure 1 , a process for recycling waste water from wax mold cleaning, comprising the following steps:

[0063] Step 1: Collect the waste water from wax mold cleaning in the first collection tank, then inject it into the cooling tower through the suction pipe for cooling. Inject the sewage in the cooling tower into the air flotation machine, and separate the wax from the water through the air flotation machine to obtain floating wax and pretreated waste water. The floating wax is collected and recycled, and the pretreated waste water enters the second collection tank;

[0064] Step 2: Add caustic soda and slaked lime to the second collection tank to adjust the pH to 9, add the enhanced water treatment agent of Example 4, and stir and mix for 60 min under the condition of a rotation speed of 100 r / min. After standing for 2 h, the precipitate is transported to the filter press through a pipeline, and the clear liquid is refluxed to the production line for reuse.

[0065] Among them, the temperature of the waste water treated by the cooling tower is 24 °C. The filtrate of the filter press enters the second collection tank for recycling, and the filter cake is transported out. The mass ratio of caustic soda to slaked lime is 1:1, and the dosage ratio of the enhanced water treatment agent to the pretreated waste water is 1.2 mg / L.

[0066] Comparative Example 3

[0067] Compared with Example 5, the enhanced water treatment agent in Example 5 is replaced with the substance in Comparative Example 1, and the other raw materials and preparation processes are the same as those in Example 5.

[0068] Comparative Example 4

[0069] Compared with Example 5, the enhanced water treatment agent in Example 5 is replaced with the substance in Comparative Example 2, and the other raw materials and preparation processes are the same as those in Example 5.

[0070] The wax mold cleaning wastewater of a precision casting in Suzhou was treated by the wax mold wastewater recycling process described in Examples 5 - 7 and Comparative Examples 3 - 4. The COD and ammonia nitrogen contents in the treated clear liquid were measured, and the COD removal rate and ammonia nitrogen removal rate were calculated. The quality of the raw water was COD 1084 mg / L, ammonia nitrogen 129.4 mg / L, and pH 2.46. The results are shown in Table 1:

[0071] Table 1

[0072] Project Example 5 Example 6 Example 7 Comparative Example 3 Comparative Example 4 COD removal rate (%) 85.6 88.2 91.7 83.1 76.8 Ammonia nitrogen removal rate (%) 97.2 98.5 99.3 94.6 85.4

[0073] As can be seen from Table 1, compared with Comparative Examples 3 - 4, for the wax mold cleaning wastewater recycling process in Examples 5 - 7, the recycled water obtained from the production line has a high COD removal rate and ammonia nitrogen removal rate, indicating that the treatment process of the present invention can effectively remove pollutants in the wax mold cleaning wastewater and enable the recycled use of the treated water, saving production costs.

[0074] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0075] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wax mold cleaning wastewater recycling process, characterized in that: The steps include: The first step is to collect the wax model cleaning wastewater in the first water collection tank, and then inject it into the cooling tower through the pumping pipe for cooling, and inject the sewage in the cooling tower into the flotation machine, and separate the wax and water through the flotation machine to obtain floating wax and pre-treated wastewater, the floating wax is collected and recycled, and the pre-treated wastewater enters the second collection tank; Step 2: Add caustic soda flakes and slaked lime to the second collection tank to adjust the pH to 8-9, then add the enhanced water treatment agent, stir and mix for 30-60 minutes, let stand for 1-2 hours, and then transport the precipitate to the filter press through the pipeline, and return the clear liquid to the production line for reuse; Enhanced water treatment agent is made by the following steps: Add acrylamide, cross-linkable potassium ferrate, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride and gallic acid monomer into an organic mixed solvent, pass nitrogen to deoxygenate for 10-30 minutes, add an initiator solution, stir and react at a temperature of 70-90° C. for 3-7 hours, filter after the reaction, wash the filtrate with deionized water for 3-5 times, and dry to obtain an enhanced water treatment agent; Cross-linkable potassium ferrate is prepared by the following steps: Step S1, placing β-cyclodextrin in a flask, adding deionized water and stirring to obtain a β-cyclodextrin aqueous solution, gelatinizing at 50-60° C. for 20-40 min, adding potassium ferrate to the flask while stirring, continuing to stir for 30 min, cooling to room temperature, filtering, vacuum drying, grinding and passing through a 200-mesh sieve to obtain potassium ferrate-coated microspheres; Step S2, placing the potassium ferrate coated microspheres in anhydrous DMSO, adding sodium hydroxide after stirring, stirring at room temperature for 1 hour, cooling to 5-10°C, adding allyl bromide dropwise while stirring, stirring and reacting for 48 hours, standing for 2 hours after the reaction is completed, and concentrating under reduced pressure to 1 / 3 of the original volume, washing the concentrated product with acetone for 3-5 times, filtering and drying to obtain cross-linkable potassium ferrate; Gallic acid monomer is prepared by the following steps: Propyl gallate, allyl alcohol, p-toluenesulfonic acid and N,N-dimethylformamide are added into a flask, the temperature is raised to 125° C., the reaction is stirred for 3-5 hours, and the gallic acid monomer is obtained by rotary evaporation. The molar ratio of propyl gallate to allyl alcohol is 1:1, and the amount of p-toluenesulfonic acid is 2-3% of the total mass of propyl gallate and allyl alcohol.

2. A wax mold cleaning wastewater recycling process according to claim 1, characterized in that: The temperature of wastewater treated by cooling tower is 15-24℃.

3. A wax mold cleaning wastewater recycling process according to claim 1, characterized in that: The filtrate from the filter press enters the second collection tank for recycling, and the filter cake is transported out.

4. A wax mold cleaning wastewater recycling process according to claim 1, characterized in that: The dosage ratio of the enhanced water treatment agent and pretreated wastewater is 0.8-1.2 mg / L.

5. A wax model cleaning wastewater recycling process according to claim 1, characterized in that: The mass ratio of acrylamide, cross-linkable potassium ferrate, 2-acrylamido-2-methylpropanesulfonic acid, methacryloyloxyethyl trimethyl ammonium chloride and gallic acid monomer is 4-6:10-20:2-3:2-3:2-3, and the organic mixed solvent is composed of anhydrous ethanol and butyl acetate in a volume ratio of 7-9:1-3.

6. A wax model cleaning wastewater recycling process according to claim 1, characterized in that: In step S1, the mass ratio of β-cyclodextrin, deionized water and potassium ferrate is 1:10-20:0.2-0.

4.

7. A wax model cleaning wastewater recycling process according to claim 1, characterized in that: In step S2, the usage ratio of potassium ferrate-coated microspheres, anhydrous DMSO, sodium hydroxide and allyl bromide is 5-6 g: 60-80 mL: 3.5-4.7 g: 2.6-3.6 g.

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