Treatment method of holder cleaning water and mold processing cutting fluid

Abstract

The invention discloses a treatment method of retainer cleaning water and mold processing cutting fluid, and belongs to the technical field of industrial sewage treatment. The mixed sewage of holder cleaning water and mold processing cutting fluid is subjected to first filter pressing and then conveyed into a sewage pool to adjust the pH value, the sewage oil removal agent accounting for 70% of the total weight of the sewage oil removal agent and the sewage are synchronously conveyed into a stirring cylinder to be stirred, then second filter pressing is conducted, and the sewage oil removal agent is obtained. Adding the rest 30% by weight of the sewage oil removal agent into a second stirring cylinder for treatment, then carrying out third filter pressing, conveying the sewage oil removal agent into a sedimentation tank, adding a bactericide, and standing in the sedimentation tank to obtain treated water. According to the process, the sewage and the sewage oil-removing liquid medicine are simultaneously input into the stirring cylinder, so that the contact area of the liquid medicine and the sewage can be increased, the sewage oil-removing liquid medicine can play a role in the conveying process, and the sewage treatment efficiency is improved.

Description

A method for treating cage cleaning water and mold processing cutting fluid. Technical Field

[0001] This application relates to a method for treating cage cleaning water and mold processing cutting fluid, belonging to the field of industrial wastewater treatment technology. Background Technology

[0002] As a core precision component in mechanical transmission systems, the surface cleanliness of the cage directly determines the operational stability, transmission accuracy, and service life of the equipment. During production, processing, and maintenance, contaminants such as lubricating oil, cutting fluid, metal shavings, and dust easily adhere to the cage surface. Specialized equipment such as ultrasonic cleaners and spray cleaners are required for cleaning. During cleaning, contaminants are removed from the cage surface with the cleaning fluid, forming complex industrial wastewater. The main contaminants fall into two categories: first, recalcitrant organic pollutants, primarily mineral oil, lubricating oil, and cutting fluid detached during cleaning. These substances are highly viscous and hydrophobic, easily forming an oil film on the water surface, hindering dissolved oxygen processes and significantly increasing the COD value of the wastewater; second, suspended solids and trace heavy metals. Cages are mostly made of metal, and a small amount of metal shavings are detached during cleaning. Additionally, some metal cages may contain toxic heavy metal ions such as chromium and nickel, which are introduced into the wastewater during cleaning, further increasing the difficulty of wastewater treatment.

[0003] Furthermore, the cage undergoes a stretching process before cleaning, during which stretching oil is added. The stretching oil remaining on the cage surface contains surfactants, which cause the oily components in the wastewater to form a stable emulsion with the water, increasing the difficulty of wastewater treatment. Simultaneously, the cage undergoes a metal cutting process before cleaning, during which cutting fluid is added. This cutting fluid contains iron filings and iron dust.

[0004] In current technologies, wastewater treatment often involves simultaneously treating cleaning wastewater and cutting fluid. This undoubtedly increases treatment time and complexity. Furthermore, most current chemical wastewater treatment methods employ common treatment agents, such as a mixture of polyacrylamide and polyaluminum chloride. While these agents can break up emulsions in wastewater and adsorb some heavy metal ions, their adsorption and treatment effects on trace amounts of heavy metal ions such as chromium and nickel are not very good. Summary of the Invention

[0005] To address the aforementioned issues, a method for treating cage cleaning water and mold processing cutting fluid is provided. The first pressure filtration removes larger impurities and suspended grease. The wastewater and wastewater degreasing solution are simultaneously fed into the mixing tank, which increases the contact area between the solution and the wastewater. Furthermore, the wastewater degreasing solution takes effect during the transportation process, thereby improving the efficiency of wastewater treatment.

[0006] One aspect of this application provides a method for treating cage cleaning water and mold processing cutting fluid, comprising the following steps: (1) performing a first pressure filtration on the mixed wastewater of cage cleaning water and mold processing cutting fluid to remove larger particulate impurities from the wastewater; (2) transporting the wastewater treated in step (1) to a wastewater tank, wherein the wastewater tank is equipped with several magnetic suction rods, allowing it to stand for 10-15 minutes, and then adding a pH adjuster to the wastewater tank to adjust the pH of the wastewater to 7-9; (3) loading 70% of the total weight of the wastewater degreasing agent into a tank containing 10-15 times the amount of the agent, and then applying it to the wastewater tank. The wastewater oil removal solution is obtained by stirring evenly in the treatment tank. Then, the wastewater oil removal solution and wastewater are simultaneously transported to the first mixing tank and stirred for 45-60 minutes. (4) After the water treated in step (3) is filtered for the second time, it is transported to the second mixing tank. The remaining 30% of the weight of wastewater oil removal agent is added to the second mixing tank and stirred for 30-40 minutes. (5) After the water treated in step (4) is filtered for the third time, it is transported to the sedimentation tank. A bactericide is added and the water is left to stand in the sedimentation tank for 1-2 hours to obtain the treated water.

[0007] In this application, the wastewater undergoes a first pressure filtration process to initially remove larger particulate impurities and suspended oils. The wastewater is then transferred to a wastewater tank where a pH adjuster is added to maintain a pH between 7 and 9. At this pH, the solubility of some metal ions in the wastewater decreases, leading to precipitation and initially reducing the content of heavy metal ions. Next, a wastewater oil removal agent is added to break up the emulsified wastewater, causing oily components to detach from the water and float to the surface. A second pressure filtration process removes the suspended oily components and impurities produced during the oil removal agent treatment. A second addition of the oil removal agent further removes impurities. Through these two additions of the oil removal agent, the removal efficiency of impurities in the wastewater is synergistically improved, reducing the COD value of the wastewater.

[0008] By simultaneously conveying wastewater and the wastewater degreasing solution into the mixing tank, the contact area between the wastewater and the wastewater degreasing solution can be effectively increased, thereby improving the wastewater treatment effect. At the same time, wastewater treatment can be achieved during the conveying process of wastewater and wastewater degreasing solution, thus improving the efficiency of wastewater treatment.

[0009] In addition, by installing magnetic bars in the sewage tank, especially in sewage containing cutting fluid which contains a large number of metal ions such as iron, the magnetic bars can adsorb the metal ions in the sewage, thereby reducing the content of metal ions in the sewage.

[0010] Optionally, the rotational speed in step (3) is 50-60 r / min.

[0011] Optionally, the rotational speed in step (4) is 30-50 r / min.

[0012] Optionally, the total amount of the wastewater oil removal agent added is 30-45 g / m³. 3 .

[0013] At this dosage, the wastewater oil removal agent can effectively remove impurity ions from wastewater, avoiding waste of the wastewater treatment agent and reducing the residual amount of the wastewater treatment agent in the treated water, thus affecting the quality of the treated water. If the total dosage of the wastewater oil removal agent exceeds 45 g / m³... 3 It doesn't significantly contribute to wastewater treatment efficiency, but it leaves a higher residue level in the wastewater, affecting its final use and increasing production costs for businesses. If the total amount of oil-removing agent added is less than 30g / m³... 3 If the treatment is not effective, the wastewater will not meet the standards for recycling or discharge.

[0014] Optionally, the bactericide includes one of sodium hypochlorite, chlorine dioxide, and quaternary ammonium salts.

[0015] Preferably, the bactericide is isothiazolinone.

[0016] Optionally, the amount of the bactericide added is 0.1-0.3% of the total mass of the system.

[0017] Optionally, the wastewater oil removal agent comprises, by mass fraction: 30-40 parts modified polyacrylamide, 20-30 parts polyaluminum chloride, and 10-20 parts bentonite; the modified polyacrylamide is obtained by modification with 2-phenylepoxypropane and pyridine.

[0018] After ring-opening polymerization of modified polyacrylamide and 2-phenyl propylene oxide, polyoxypropylene segments are introduced into the polyacrylamide molecular chain, followed by the introduction of pyridine structures into the polyacrylamide molecular chain. The pyridine structures can enhance the adsorption capacity and charge neutralization effect at the oil-water interface, achieving rapid demulsification and improving demulsification efficiency. The polyoxypropylene segments can enhance the adsorption capacity of the demulsifier at the oil-water interface, damage the strength of the interfacial film, reduce the oil-water interfacial tension, and promote the rapid merging of the demulsified oily components.

[0019] Bentonite can quickly adsorb the combined oily components, effectively removing oily components from wastewater. Bentonite and modified polyacrylamide work synergistically to improve the removal of oily components from wastewater, reduce the COD value of the treated water, and facilitate subsequent recycling.

[0020] Optionally, the preparation method of the modified polyacrylamide includes the following steps: S1: Add polyacrylamide to 3 times the volume of alkaline solution, heat to 60-70℃, and treat for 2-3 hours to obtain polyacrylamide containing hydroxyl groups; S2: Add excess amination agent to the polyacrylamide containing hydroxyl groups, heat to 70-80℃ and treat for 4-5 hours, neutralize with hydrochloric acid solution and dry to obtain polyacrylamide containing amino and hydroxyl groups; S3: Add the polyacrylamide containing amino and hydroxyl groups to a solvent, add a catalyst, add 2-phenylepoxypropane under inert gas protection, then add an initiator and react at 60-70℃ for 2-4 hours, and obtain intermediate A after vacuum distillation; S4: Add intermediate A to a solvent, then add formaldehyde and anhydrous zinc chloride, stir and dropwise add concentrated hydrochloric acid, react at 30-40℃ for 4-5 hours, then add pyridine and react at 50-60℃ for 3-4 hours.

[0021] By hydrolyzing the amide groups in polyacrylamide under alkaline conditions, some amide groups are converted into hydroxyl and carboxyl groups. Then, an excess amination agent is added to exchange with the amide or carboxyl groups in the polyacrylamide, introducing a large number of amino groups into the polyacrylamide backbone and providing highly active sites for subsequent reactions. The ring-opening polymerization of propylene oxide in 2-phenylpropylene oxide is initiated by a free radical initiator, grafting polyoxypropylene segments onto the polyacrylamide backbone to enhance the product's adsorption capacity at the oil-water interface. Formaldehyde, anhydrous zinc chloride, and concentrated hydrochloric acid are then added for chloromethylation to introduce chloromethyl active sites. Pyridine is then added; the nitrogen atom on the pyridine ring has strong nucleophilicity and reacts with the chloromethyl group to generate quaternized pyridine groups. Through these modifications, the modified polyacrylamide can neutralize negatively charged oil droplets, ultimately possessing multiple functions such as hydrophobic adsorption, complexation of heavy metal ions, and demulsification.

[0022] Optionally, the alkaline solution is a 10% sodium hydroxide solution by mass.

[0023] Optionally, the amination agent includes one of ammonia, triethylenetetramine, tetraethylenepentamine, and ethylenediamine.

[0024] Optionally, the hydrochloric acid solution is a 5 wt% hydrochloric acid solution.

[0025] Optionally, the initiator is azobisisobutyronitrile.

[0026] Optionally, the molar ratio of polyacrylamide to amination agent in step S1 is 1:(1.5-2).

[0027] At this ratio, the amide bonds and carboxyl groups in polyacrylamide are converted into secondary or primary amine structures under the action of the amination agent, resulting in a large number of amino groups on the polyacrylamide. In aqueous solution, these amino groups can be protonated to generate positively charged amino groups, which can quickly electrostatically adsorb negatively charged emulsified oil droplets and colloidal impurities in wastewater, neutralize the surface charge of the oil droplets, and improve the removal of impurities and oily components from wastewater.

[0028] Optionally, in step S3, the mass ratio of the polyacrylamide containing amino and hydroxyl groups to 2-phenyl propylene oxide is 1:(4-5).

[0029] At this ratio, the hydroxyl and amino groups on the polyacrylamide containing amino and hydroxyl groups have strong reactivity. Under the action of a radical initiator, 2-phenylepoxypropylene is initiated to undergo ring-opening polymerization, grafting polyoxypropylene segments onto the main chain of the polyacrylamide. If the amount of 2-phenylepoxypropylene added is too small, the grafting rate with the polyacrylamide is insufficient, and the polyoxypropylene segments cannot effectively cover the oil droplet interface, resulting in poor demulsification and thus reducing the effectiveness of the modified polyacrylamide. If the amount of 2-phenylepoxypropylene added is too large, it will lead to excessive grafting of segments, resulting in excessively strong hydrophobicity of the modified polyacrylamide molecular chains. In water, these chains are prone to coiling and agglomeration, reducing their water solubility and dispersibility, making it difficult for them to play an effective role in wastewater treatment.

[0030] Optionally, in step S4, the mass ratio of intermediate A, formaldehyde and concentrated hydrochloric acid is 1:(1.5-2):(3-5).

[0031] At this ratio, the formaldehyde fully reacts with the amino and hydroxyl groups on the molecular chain of intermediate A to generate a hydroxymethyl intermediate, which is then converted into a chloromethyl active site under the catalysis of concentrated hydrochloric acid. This avoids the side reactions caused by excessive formaldehyde, which would affect the function of the final product. If there is too little concentrated hydrochloric acid, the formaldehyde in the system may undergo self-polymerization, affecting the formation of paraformaldehyde impurities.

[0032] Optionally, the mass ratio of intermediate A to pyridine in step S4 is 1:(2-3).

[0033] At this ratio, the nitrogen atom in the pyridine structure exhibits strong nucleophilicity and can react with the chloromethyl group on the intermediate A molecular chain to generate a positively charged pyridine quaternary ammonium group. Excessive pyridine addition will result in excessive pyridine residue, making removal difficult and complex, thus affecting the effectiveness of the final product.

[0034] Optionally, the mass ratio of anhydrous zinc chloride to intermediate A is 1:(1.01-1.1).

[0035] At this ratio, zinc chloride can fully complex formaldehyde. If there is too much zinc chloride, the amide bond in the main chain of intermediate A will be acid-broken, affecting the final product.

[0036] The beneficial effects of this application include, but are not limited to: 1. According to the treatment method of cage cleaning water and mold processing cutting fluid of this application, the first pressure filtration removes larger impurities and suspended grease. The simultaneous input of sewage and sewage degreasing agent into the mixing tank can increase the contact area between the agent and sewage, and the sewage degreasing agent can play a role during the transportation process, thereby improving the efficiency of sewage treatment.

[0037] 2. According to the treatment method of cage cleaning water and mold processing cutting fluid of this application, the sewage degreasing agent is added in two stages, which can remove impurities in the sewage in stages, resulting in better impurity removal effect. This prevents the sewage degreasing agent from complexing too much with the impurities in the sewage when added at one time, thus failing to remove impurities with a small content in the water.

[0038] 3. The wastewater oil removal agent according to this application, by introducing polyoxypropylene segments and pyridine structures, can enhance the adsorption capacity and charge neutralization effect at the oil-water interface, achieve rapid demulsification, and improve demulsification efficiency. It can also enhance the adsorption capacity of the demulsifier at the oil-water interface, destroy the strength of the interfacial film, reduce the oil-water interfacial tension, and promote the rapid merging of oily components after demulsification. Detailed Implementation

[0039] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0040] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application were all purchased commercially.

[0041] Unless otherwise specified, the methods used in the embodiments and comparative examples of this application are conventional methods in the prior art.

[0042] The filter press model used in this application is not specifically limited, as long as it can achieve the filtration of wastewater. In the following embodiments and comparative examples of this application, the feed pressure of the filter press for both primary and secondary filtration is 8 kg / cm². 2 The pressing pressure is 12 kg / cm². 2 The blowing pressure is 12 kg / cm². 2 The air permeability of the filter cloth is 30 L / m. 2 / s, and the pressing time is 5 minutes.

[0043] In the embodiments and comparative examples of this application, the polyacrylamide is a cationic polyacrylamide with a molecular weight of 8 million and an ionic degree of 20%; the pyridine is 2,4,6-trimethylpyridine, CAS number: 108-75-8; the polyaluminum chloride CAS number: 101707-17-9; the diethylenetriamine CAS number: 111-40-0; the triethylenetetramine CAS number: 112-24-3; the triethylamine CAS number: 121-44-8; the 2-phenyl propylene oxide CAS number: 2085-88-3; the propylene oxide CAS number: 75-56-9; the formaldehyde CAS number: 50-00-0; the azobisisobutyronitrile CAS number: 78-67-1; and the isothiazolinone CAS number: 26172-55-4.

[0044] Example 1 This application relates to a method for treating cage cleaning water and mold processing cutting fluid, comprising the following steps: (1) performing a first pressure filtration on the mixed wastewater of cage cleaning water and mold processing cutting fluid to remove larger impurities in the wastewater; (2) transporting the wastewater treated in step (1) to a wastewater tank, which is equipped with several magnetic suction rods, letting it stand for 1 minute, and then measuring the pH of the wastewater to be 11.8, adding 10% dilute hydrochloric acid to the wastewater tank to adjust the pH of the wastewater to 9; (3) loading 70% of the total weight of the wastewater degreasing agent into a tank containing 10 times the amount of the agent, and controlling the addition amount of the wastewater degreasing agent to be 31.5 g / m 3 The wastewater oil removal solution was obtained by stirring the wastewater in the wastewater treatment tank. Then, the wastewater oil removal solution and wastewater were simultaneously transported to the first mixing tank and stirred at 50 r / min for 45 min. (4) After the water treated in step (3) was filtered for the second time, it was transported to the second mixing tank. The remaining 30% by weight of wastewater oil removal agent was added to the second mixing tank, and the amount of wastewater oil removal agent added was controlled to be 13.5 g / m³. 3Continue stirring in the second mixing tank at 50 r / min for 30 min; the wastewater oil removal agent, by mass fraction, includes: 40 parts modified polyacrylamide, 20 parts polyaluminum chloride, and 20 parts bentonite; the preparation method of the modified polyacrylamide includes the following steps: S1: add polyacrylamide to 3 times the amount of 10% sodium hydroxide solution, heat to 60℃, treat for 3 h, and dry to obtain hydroxyl-containing polyacrylamide; S2: add hydroxyl-containing polyacrylamide to 3 times the amount of water, add diethylenetriamine, the molar ratio of hydroxyl-containing polyacrylamide to diethylenetriamine is 1:1.5, heat to 70℃ for 5 h, neutralize with 10% hydrochloric acid solution, and dry to obtain amino and hydroxyl-containing polyacrylamide; S3: add amino and hydroxyl-containing polyacrylamide to diethylenetriamine... Polyacrylamide was added to 4 times its volume of dimethyl sulfoxide, followed by 2% (by weight) of triethylamine containing amino and hydroxyl groups of polyacrylamide. Under nitrogen protection, 2-phenylepoxypropane was added, with a mass ratio of amino and hydroxyl polyacrylamide to 2-phenylepoxypropane of 1:4. Then, 0.5% (by weight) of azobisisobutyronitrile containing amino and hydroxyl polyacrylamide of 0.5% (by weight) was added, and the mixture was reacted at 60°C for 2 hours. After vacuum distillation, intermediate A was obtained. S4: Intermediate A was added to 5 times its volume of chloroform, followed by formaldehyde and anhydrous zinc chloride. Concentrated hydrochloric acid was added dropwise with stirring, with a mass ratio of intermediate A, formaldehyde, and concentrated hydrochloric acid of 1:1.5:3 and a mass ratio of anhydrous zinc chloride to intermediate A of 1:1.01. The mixture was reacted at 30°C for 5 hours, followed by the addition of pyridine, with a mass ratio of intermediate A to pyridine of 1:2. The mixture was reacted at 60°C for 3 hours.

[0045] (5) After the water treated in step (4) is filtered for the third time, it is transported to the sedimentation tank, and 0.1% sodium hypochlorite of the total mass of the system is added. The water is left to stand in the sedimentation tank for 2 hours to obtain the treated water.

[0046] Example 2 This application relates to a method for treating cage cleaning water and mold processing cutting fluid, including the following steps: (1) performing a first pressure filtration on the mixed wastewater of cage cleaning water and mold processing cutting fluid to remove larger impurities in the wastewater; (2) transporting the wastewater treated in step (1) to a wastewater tank, which is equipped with several magnetic suction rods, letting it stand for 15 minutes, and then measuring the pH of the wastewater to be 11.1, adding 10% dilute hydrochloric acid to the wastewater tank to adjust the pH of the wastewater to 7; (3) loading 70% of the total weight of the wastewater degreasing agent into a tank containing 15 times the amount of the agent, and controlling the addition amount of the wastewater degreasing agent to be 21 g / m 3The wastewater oil removal solution is obtained by stirring evenly in the wastewater treatment tank. Then, the wastewater oil removal solution and wastewater are simultaneously transported to the first mixing tank and stirred at 60 r / min for 60 min. (4) After the water treated in step (3) is filtered for the second time, it is transported to the second mixing tank. The remaining 30% by weight of wastewater oil removal agent is added to the second mixing tank, and the amount of wastewater oil removal agent added is controlled to be 9 g / m. 3 Continue stirring in the second mixing tank at 30 r / min for 40 min; the wastewater oil removal agent, by mass fraction, includes: 30 parts modified polyacrylamide, 30 parts polyaluminum chloride, and 10 parts bentonite; the preparation method of the modified polyacrylamide includes the following steps: S1: add polyacrylamide to 3 times the amount of 10% sodium hydroxide solution, heat to 70℃, treat for 2 h, and dry to obtain hydroxyl-containing polyacrylamide; S2: add hydroxyl-containing polyacrylamide to 3 times the amount of water, add triethylenetetramine, the molar ratio of hydroxyl-containing polyacrylamide to triethylenetetramine is 1:2, heat to 80℃ for 4 h, neutralize with 10% hydrochloric acid solution, and dry to obtain amino and hydroxyl-containing polyacrylamide; S3: add amino and hydroxyl-containing polyacrylamide to triethylenetetramine solution... Polyacrylamide was added to 4 times its volume of dimethyl sulfoxide, followed by 2% (by weight) of triethylamine (containing amino and hydroxyl polyacrylamide). Under nitrogen protection, 2-phenylepoxypropane was added, with a mass ratio of amino and hydroxyl polyacrylamide to 2-phenylepoxypropane of 1:5. Then, 0.5% (by weight) of azobisisobutyronitrile (containing amino and hydroxyl polyacrylamide) was added, and the mixture was reacted at 70°C for 4 hours. After vacuum distillation, intermediate A was obtained. S4: Intermediate A was added to 5 times its volume of chloroform, followed by formaldehyde and anhydrous zinc chloride. Concentrated hydrochloric acid was added dropwise with stirring, with a mass ratio of intermediate A, formaldehyde, and concentrated hydrochloric acid of 1:2:5 and a mass ratio of anhydrous zinc chloride to intermediate A of 1:1.1. The mixture was reacted at 40°C for 4 hours, followed by the addition of pyridine, with a mass ratio of intermediate A to pyridine of 1:3. The mixture was reacted at 50°C for 4 hours.

[0047] (5) After the water treated in step (4) is filtered for the third time, it is transported to the sedimentation tank, and 0.3% of the total mass of chlorine dioxide is added. The water is left to stand in the sedimentation tank for 1 hour to obtain the treated water.

[0048] Example 3 This application relates to a method for treating cage cleaning water and mold processing cutting fluid, including the following steps: (1) performing a first pressure filtration on the mixed wastewater of cage cleaning water and mold processing cutting fluid to remove larger impurities in the wastewater; (2) transporting the wastewater treated in step (1) to a wastewater tank, which is equipped with several magnetic suction rods, letting it stand for 12 minutes, and then measuring the pH of the wastewater to be 10.8, adding 10% dilute hydrochloric acid to the wastewater tank to adjust the pH of the wastewater to 8; (3) loading 70% of the total weight of the wastewater degreasing agent into a tank containing 15 times the amount of the agent, and controlling the addition amount of the wastewater degreasing agent to be 28g / m³. 3 The wastewater oil removal solution is obtained by stirring evenly in the wastewater treatment tank. Then, the wastewater oil removal solution and wastewater are simultaneously transported to the first mixing tank and stirred at 55 r / min for 50 min. (4) After the water treated in step (3) is filtered for the second time, it is transported to the second mixing tank. The remaining 30% by weight of wastewater oil removal agent is added to the second mixing tank, and the amount of wastewater oil removal agent added is controlled to be 12 g / m. 3 Continue stirring in the second mixing tank at 40 r / min for 35 min; the wastewater degreasing agent, by mass fraction, comprises: 35 parts modified polyacrylamide, 35 parts polyaluminum chloride, and 15 parts bentonite; the preparation method of the modified polyacrylamide includes the following steps: S1: add polyacrylamide to 3 times the amount of 10% sodium hydroxide solution, heat to 35℃, treat for 2.5 h, and dry to obtain hydroxyl-containing polyacrylamide; S2: add hydroxyl-containing polyacrylamide to 3 times the amount of water, add triethylenetetramine, the molar ratio of hydroxyl-containing polyacrylamide to triethylenetetramine is 1:1.8, heat to 75℃ for 4.5 h, neutralize with 10% hydrochloric acid solution, and dry to obtain amino and hydroxyl-containing polyacrylamide; S3: add amino and hydroxyl-containing polyacrylamide to 10% sodium hydroxide solution, heat to 35% sodium hydroxide solution, treat for 4.5 h, neutralize with 10% hydrochloric acid solution, and dry to obtain amino and hydroxyl-containing polyacrylamide; Acrylamide was added to 4 times its volume of dimethyl sulfoxide, followed by 2% (by weight) of triethylamine (containing amino and hydroxyl polyacrylamide). Under nitrogen protection, 2-phenylepoxypropane was added, with a mass ratio of amino and hydroxyl polyacrylamide to 2-phenylepoxypropane of 1:4.5. Then, 0.5% (by weight) of azobisisobutyronitrile (containing amino and hydroxyl polyacrylamide) was added, and the mixture was reacted at 65°C for 3 hours. After vacuum distillation, intermediate A was obtained. S4: Intermediate A was added to 5 times its volume of chloroform, followed by formaldehyde and anhydrous zinc chloride. Concentrated hydrochloric acid was added dropwise with stirring, with a mass ratio of intermediate A, formaldehyde, and concentrated hydrochloric acid of 1:1.7:4 and a mass ratio of anhydrous zinc chloride to intermediate A of 1:1.05. The mixture was reacted at 35°C for 4.5 hours, followed by the addition of pyridine, with a mass ratio of intermediate A to pyridine of 1:2.5. The mixture was reacted at 50°C for 3.5 hours.

[0049] (5) After the water treated in step (4) is filtered for the third time, it is transported to the sedimentation tank, and 0.2% of the total mass of isothiazolinone is added. The water is left to stand in the sedimentation tank for 1.5 hours to obtain the treated water.

[0050] Example 4: The difference between this example and Example 3 is that the total amount of wastewater oil removal agent added is 10 g / m³. 3 The rest is the same as in Example 3.

[0051] Example 5 The difference between this example and Example 3 is that the wastewater oil removal agent contains only 25 parts of polyaluminum chloride and 15 parts of bentonite, while the rest is the same as in Example 3.

[0052] Example 6 The difference between this example and Example 3 is that the wastewater oil removal agent contains only 35 parts of cationic polyacrylamide, and the rest is the same as in Example 3.

[0053] Example 7 The difference between this example and Example 3 is that the wastewater oil removal agent is replaced with intermediate A in step S3, and the rest is the same as in Example 3.

[0054] Example 8 The difference between this example and Example 3 is that the mass ratio of polyacrylamide containing amino and hydroxyl groups to 2-phenylepoxypropane in step S3 is 1:1, and the rest is the same as in Example 3.

[0055] Example 9 The difference between this example and Example 3 is that 2-phenyl propylene oxide in step S3 is replaced with propylene oxide, and the rest is the same as in Example 3.

[0056] Example 10 The difference between this example and Example 3 is that the mass ratio of intermediate A, formaldehyde and concentrated hydrochloric acid in step S4 is 1:0.8:3, and the rest is the same as in Example 3.

[0057] Example 11 The difference between this example and Example 3 is that the mass ratio of intermediate A to pyridine in step S4 is 1:5, and the rest is the same as in Example 3.

[0058] The difference between Comparative Example 1 and Example 3 is that step (4) is not performed, and all the wastewater oil removal agent is added at once. The rest is the same as in Example 3.

[0059] The difference between Comparative Example 2 and Example 3 is that step (1) is not performed, and the sewage is directly added to the sewage tank. The rest is the same as Example 3.

[0060] The difference between Comparative Example 3 and Example 3 is that the pH of the wastewater in the wastewater tank is not adjusted, but otherwise it is the same as Example 3.

[0061] Test Example 1: The treated water obtained from Examples 1-11 and Comparative Examples 1-3 was subjected to the following tests: 1) COD removal rate: The COD removal rate in wastewater was tested according to the test method in GB / T15456-2019; 2) Suspended solids content test: The suspended solids removal rate in water was tested according to the test method in GB11901-1989; The specific test results are shown in Table 1.

[0062] Table 1

[0063] Test Example 21) Turbidity test: The turbidity meter was used for testing; 2) Oil content test of wastewater: The gravimetric method was used for testing; Petroleum ether was used as the extraction solvent. Wastewater before treatment and water after treatment in Examples 1-11 and Comparative Examples 1-3 were extracted by Soxhlet extractor, and the solvent was evaporated and dried before weighing; The specific test results are shown in Table 2.

[0064] Table 2

[0065] The above description is merely an embodiment of this application, and the scope of protection of this application is not limited to these specific embodiments, but is determined by the claims of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the technical concept and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for treating cage cleaning water and mold processing cutting fluid, characterized in that, The process includes the following steps: (1) Firstly filter the mixed wastewater of cage cleaning water and mold processing cutting fluid to remove larger impurities from the wastewater; (2) Transport the wastewater treated in step (1) to a wastewater tank, which is equipped with several magnetic suction rods, let it stand for 10-15 minutes, and then add a pH adjuster to adjust the pH of the wastewater to 7-9; (3) Put 70% of the total weight of the wastewater degreasing agent into a tank containing 10-15 times the amount of the agent, and stir it evenly in the wastewater treatment tank to obtain the wastewater degreasing agent solution. Then, the wastewater oil removal agent and wastewater are simultaneously transported to the first mixing tank and stirred for 45-60 minutes; (4) After the water treated in step (3) is filtered for the second time, it is transported to the second mixing tank, and the remaining 30% of the weight of wastewater oil removal agent is added to the second mixing tank. The water is stirred for 30-40 minutes; (5) After the water treated in step (4) is filtered for the third time, it is transported to the sedimentation tank, bactericide is added, and the water is left to stand in the sedimentation tank for 1-2 hours to obtain the treated water.

2. The method for treating cage cleaning water and mold machining cutting fluid according to claim 1, characterized in that, The total addition amount of the wastewater oil removal agent is 30-45 g / m³. 3 .

3. The method for treating cage cleaning water and mold machining cutting fluid according to claim 1, characterized in that, The bactericide includes one of sodium hypochlorite, chlorine dioxide, and quaternary ammonium salts.

4. The method for treating cage cleaning water and mold machining cutting fluid according to claim 1, characterized in that, The wastewater oil removal agent comprises, by mass fraction: 30-40 parts modified polyacrylamide, 20-30 parts polyaluminum chloride, and 10-20 parts bentonite; the modified polyacrylamide is obtained by modification with 2-phenylepoxypropane and pyridine.

5. The method for treating cage cleaning water and mold processing cutting fluid according to claim 4, characterized in that, The preparation method of the modified polyacrylamide includes the following steps: S1: Add polyacrylamide to 3 times the amount of alkaline solution, heat to 60-70℃, and treat for 2-3 hours to obtain polyacrylamide containing hydroxyl groups; S2: Add an excess of amination agent to hydroxyl-containing polyacrylamide, heat to 70-80℃ for 4-5 hours, neutralize with hydrochloric acid solution, and dry to obtain polyacrylamide containing amino and hydroxyl groups. S3: Add polyacrylamide containing amino and hydroxyl groups to a solvent, add a catalyst, add 2-phenylepoxypropane under inert gas protection, then add an initiator and react at 60-70℃ for 2-4 hours. After vacuum distillation, intermediate A is obtained; S4: Add intermediate A to a solvent, then add formaldehyde and anhydrous zinc chloride, stir and add concentrated hydrochloric acid dropwise, react at 30-40℃ for 4-5 hours, then add pyridine and react at 50-60℃ for 3-4 hours.

6. The method for treating cage cleaning water and mold processing cutting fluid according to claim 5, characterized in that, The amination agent includes one of diethylenetriamine, ammonia, triethylenetetramine, tetraethylenepentamine, and ethylenediamine.

7. The method for treating cage cleaning water and mold machining cutting fluid according to claim 5, characterized in that, In step S2, the molar ratio of hydroxyl-containing polyacrylamide to amination agent is 1:(1.5-2).

8. The method for treating cage cleaning water and mold machining cutting fluid according to claim 5, characterized in that, In step S3, the mass ratio of polyacrylamide containing amino and hydroxyl groups to 2-phenyl propylene oxide is 1:(4-5).

9. The method for treating cage cleaning water and mold processing cutting fluid according to claim 5, characterized in that, In step S4, the mass ratio of intermediate A, formaldehyde and concentrated hydrochloric acid is 1:(1.5-2):(3-5).

10. The method for treating cage cleaning water and mold machining cutting fluid according to claim 9, characterized in that, The mass ratio of intermediate A to pyridine in step S4 is 1:(2-3).

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