Method for regenerating cutting fluid

Abstract

The application discloses a cutting fluid regeneration method, which comprises the following steps: 100, using an electrolytic device to electrolyze used cutting fluid, so that the chloride ions in the used cutting fluid are adsorbed and gathered on an anode and are oxidized into chlorine gas; 200, passing the used cutting fluid through a hydrogen type cation exchange resin, so that hydrogen functional groups of the hydrogen type cation exchange resin and metal cations in the cutting fluid are subjected to a displacement reaction. The cutting fluid regeneration method can significantly reduce the chloride ion content and the conductivity of the cutting fluid through cooperation of electrolysis and ion exchange, the chloride ion content in the cutting fluid can be reduced by 50-60%, and the same level as that of newly prepared cutting fluid is reached, in addition, the conductivity can be significantly reduced, and the rust resistance of the cutting fluid is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid production method, in particular to a cutting fluid regeneration method. BACKGROUND

[0002] As an indispensable lubricating and cooling medium in the machining process, the chloride ion in the cutting fluid will gradually accumulate with the increase of the use time. The high chloride ion content and the rising conductivity caused by the chloride ion will accelerate the corrosion of the tool, clamp and workpiece, and affect the product quality.

[0003] Currently, when the chloride ion in the cutting fluid is too high in the machining industry, the cutting fluid is replaced to meet the production process requirements, which results in high use cost.

[0004] In addition, there is a method of using activated carbon and filter membrane to filter the cutting fluid to remove impurities in the cutting fluid.

[0005] In addition, there is a method of using additives such as pH adjuster, preservative, etc. to alleviate the harm caused by the high chloride ion concentration.

[0006] In addition, ion exchange resin, electro-adsorption and other ways are used to remove chloride ions and other ions in the wastewater during the wastewater treatment of the cutting fluid. SUMMARY

[0007] The purpose of the present application is to provide a cutting fluid regeneration method, which reduces the chloride ion and conductivity of the cutting fluid by the cooperation of electrolysis and ion exchange, reduces the chloride ion content in the cutting fluid by 50-60%, reaches the same level as the newly prepared cutting fluid, and significantly reduces the conductivity to improve the rust resistance of the cutting fluid.

[0008] In order to achieve the above purpose, the present application provides a cutting fluid regeneration method, which comprises the following steps:

[0009] 100: using an electrolysis device to electrolyze the used cutting fluid, so that the chloride ions in the used cutting fluid are adsorbed and gathered on the anode and oxidized into chlorine gas;

[0010] 200: passing the used cutting fluid through a hydrogen-type cation exchange resin to cause a displacement reaction between the hydrogen functional group of the hydrogen-type cation exchange resin and the metal cations in the cutting fluid.

[0011] The cutting fluid regeneration method of the present application reduces the chloride ion in the cutting fluid by oxidizing the chloride ion gathered on the anode of the electrolysis device into chlorine gas through the electrolysis step.

[0012] Further, the cutting fluid regeneration method of the present application can further reduce the metal ion content and the conductivity of the cutting fluid by the displacement reaction between the hydrogen functional group of the hydrogen type cation exchange resin and the metal cations such as iron ions, aluminum ions and copper ions in the cutting fluid, and the hydrogen ions displaced by the hydrogen type cation exchange resin can also neutralize the hydroxyl ions to stabilize the pH value within the process requirement range.

[0013] After the regeneration treatment of the cutting fluid, the chloride ion content, the conductivity and the pH value of the treated cutting fluid can be measured. In the rare case that at least one of these indicators does not meet the process requirement, the cutting fluid stock solution or the corresponding additive can be supplemented to the treated cutting fluid.

[0014] Further, the cutting fluid regeneration method of the present application further comprises step 300 after step 200: passing the used cutting fluid through the hydroxyl type anion exchange resin to cause the displacement reaction between the hydroxyl functional group of the hydroxyl type anion exchange resin and the chloride ions in the cutting fluid.

[0015] In this preferred embodiment, the hydrogen type cation exchange resin used in step 200 before step 300 can prevent the poisoning of the hydroxyl type anion exchange resin by the metal cations in the cutting fluid to affect the adsorption performance of the hydroxyl type anion exchange resin, and the hydrogen ions displaced by the displacement reaction can neutralize the hydroxyl ions generated in the adsorption step of the hydroxyl type anion exchange resin to stabilize the pH value within the process requirement range.

[0016] The displacement reaction between the hydroxyl functional group of the hydroxyl type anion exchange resin and the chloride ions in the cutting fluid can further reduce the conductivity of the cutting fluid and remove the chloride ions, and the hydroxyl ions displaced by the displacement reaction are neutralized by the hydrogen ions generated in the adsorption step of the hydrogen type cation exchange resin, so that the present application has a more optimal implementation effect.

[0017] Further, in the cutting fluid regeneration method of the present application, the volume ratio of the hydrogen type cation exchange resin to the hydroxyl type anion exchange resin is (0.5-1.5):1.

[0018] More preferably, the volume ratio of the hydrogen type cation exchange resin to the hydroxyl type anion exchange resin is 1:1.

[0019] Further, in the cutting fluid regeneration method of the present application, the used cutting fluid is passed through the hydroxyl type anion exchange resin at a flow rate of 2-10 ml / min in step 300.

[0020] More preferably, the used cutting fluid is passed through the hydroxyl type anion exchange resin at a flow rate of 5 ml / min.

[0021] The flow rate is conducive to further improving the processing efficiency of the cutting fluid.

[0022] Preferably, in the cutting fluid regeneration method, the cathode and the anode of the electrolytic device in step 100 are both graphite electrodes.

[0023] The inventors prefer to use graphite electrodes in step 100 after comparing with copper electrodes and aluminum electrodes. This is because: the copper electrodes will dissolve to increase the copper ion content in the cutting fluid and increase the conductivity of the cutting fluid; the effect of using aluminum electrodes for electrolysis to reduce chloride ions is not obvious; and the graphite electrodes have better and more stable effects on reducing chloride ions.

[0024] In addition, it should be noted that in step 100, hydrogen is generated at the cathode of the electrolytic device, and chlorine is generated at the anode. A chlorine adsorption device can be provided to adsorb the chlorine generated at the anode by alkali, and a hydrogen collection device can be provided to collect the byproduct hydrogen generated at the cathode.

[0025] Further, in the cutting fluid regeneration method, the electrolytic voltage in step 100 is 3-5V.

[0026] In this embodiment, when the electrolytic voltage is selected as 3-5V, the chloride ions in the cutting fluid can be reduced to a large extent, and the effective components of the cutting fluid will not be removed. However, if the voltage continues to increase, the effective components of the cutting fluid will be lost. Therefore, the electrolytic voltage is selected within the range of 3-5V.

[0027] The inventors have calculated from experimental data that a graphite electrode with a surface area of 1m 2 can remove about 4.8mg of chloride ions. Based on the processing amount of the cutting fluid and the target removal amount of chloride ions, and in combination with the removal efficiency of the above graphite electrode, those skilled in the art can calculate the actual surface area of the graphite electrode required in the electrolytic device according to the needs. Since the graphite electrode will be saturated after about 30 minutes of single electrolysis, the single electrolysis time can be controlled to 30 minutes.

[0028] Further, in the cutting fluid regeneration method, the used cutting fluid is passed through the hydrogen-type cation exchange resin at a flow rate of 2-10ml / min in step 200.

[0029] More preferably, in step 200, the used cutting fluid is passed through the hydrogen-type cation exchange resin at a flow rate of 5ml / min.

[0030] The flow rate is conducive to further improving the processing efficiency of the cutting fluid.

[0031] Further, in the cutting fluid regeneration method according to the present application, in step 200, the volume ratio of the used cutting fluid to the hydrogen-type cation exchange resin is (120-160): 1.

[0032] More preferably, the volume ratio of the used cutting fluid to the hydrogen-type cation exchange resin is 150: 1.

[0033] More preferably, when the volume ratio of the hydrogen-type cation exchange resin to the hydrogen-oxygen-type anion exchange resin is 1: 1, the volume ratio of the used cutting fluid to the hydrogen-oxygen-type anion exchange resin is also 150: 1.

[0034] The inventors have found through experiments that when the volume ratio of the used cutting fluid to the hydrogen-type cation exchange resin is within the preferred range, the pH value of the cutting fluid can be ensured to be within the process standard limit, and the conductivity is significantly reduced.

[0035] Further, in the cutting fluid regeneration method according to the present application, in step 200, the volume ratio of the used cutting fluid to the hydrogen-type cation exchange resin is (120-160): 1.

[0036] Step 100 further comprises regenerating the electrodes of the electrolytic device; and / or

[0037] Step 200 further comprises regenerating the hydrogen-type cation exchange resin; and / or

[0038] Step 300 further comprises regenerating the hydrogen-oxygen-type anion exchange resin.

[0039] Since the electrolytic activity of the electrode surface of the electrolytic device decreases after a certain time of electrolysis, for example, 30 min, the concentration of chloride ions no longer decreases significantly, or even no longer decreases, the electrode can be regenerated. The electrode regeneration can be performed by emptying the cutting fluid under the power-on state, then powering off and washing the electrode surface with deionized water to remove the ions adsorbed on the electrode surface, restore the adsorption activity of the electrode, and achieve the regeneration of the electrode.

[0040] Further, the hydrogen form cation exchange resin reaches an adsorption limit after a period of use and can be regenerated. The regeneration step of the hydrogen form cation exchange resin can include: draining the machining fluid, rinsing the hydrogen form cation exchange resin with deionized water until the liquid flowing through the hydrogen form cation exchange resin is neutral; then soaking the hydrogen form cation exchange resin in an organic solvent, such as ethanol, for a period of time, such as 1-2 hours, to elute the organic material in the machining fluid adsorbed on the surface of the hydrogen form cation exchange resin; then rinsing the hydrogen form cation exchange resin again with deionized water until the organic solvent is washed out. Then, an acidic liquid can be selected as the regeneration liquid, such as 3%-5% by mass hydrochloric acid, to regenerate the hydrogen form cation exchange resin. The hydrogen form cation exchange resin can be regenerated in a certain proportion, such as a volume ratio of 1:3 of the hydrogen form cation exchange resin to the regeneration liquid. Then, the hydrogen form cation exchange resin can be rinsed again with deionized water until the liquid flowing through the hydrogen form cation exchange resin is neutral. The hydrogen form cation exchange resin can be repeatedly used through the regeneration step, thereby greatly reducing the use cost of the hydrogen form cation exchange resin.

[0041] Further, the hydrogen form cation exchange resin reaches an adsorption limit after a period of use and can be regenerated. The regeneration step of the hydrogen form cation exchange resin can include: draining the machining fluid, rinsing the hydrogen form cation exchange resin with deionized water until the liquid flowing through the hydrogen form cation exchange resin is neutral; then soaking the hydrogen form cation exchange resin in an organic solvent, such as ethanol, for a period of time, such as 1-2 hours, to elute the organic material in the machining fluid adsorbed on the surface of the hydrogen form cation exchange resin; then rinsing the hydrogen form cation exchange resin again with deionized water until the organic solvent is washed out. Then, an acidic liquid can be selected as the regeneration liquid, such as 3%-5% by mass hydrochloric acid, to regenerate the hydrogen form cation exchange resin. The hydrogen form cation exchange resin can be regenerated in a certain proportion, such as a volume ratio of 1:3 of the hydrogen form cation exchange resin to the regeneration liquid. Then, the hydrogen form cation exchange resin can be rinsed again with deionized water until the liquid flowing through the hydrogen form cation exchange resin is neutral. The hydrogen form cation exchange resin can be repeatedly used through the regeneration step, thereby greatly reducing the use cost of the hydrogen form cation exchange resin.

[0042] Preferably, the machining fluid regeneration method of the present application further has step 000 before step 100: filtering the used machining fluid.

[0043] Before step 100, the machining fluid used in the production line is filtered multiple times to remove the metal particle impurities remaining in the machining fluid during the machining process, to obtain the pretreated machining fluid. The filtering can include: screen filtering, filter paper suction filtering, vibration filter membrane filtering, and three times filtering.

[0044] The machining fluid regeneration method has the following advantages and beneficial effects:

[0045] The machining fluid regeneration method can significantly reduce the chloride ion content and conductivity of the machining fluid by the cooperation of electrolysis and ion exchange, thereby reducing the chloride ion content in the machining fluid by 50-60%, reaching the same level as the newly prepared machining fluid, and further significantly reducing the conductivity and improving the rust resistance of the machining fluid.

[0046] The machining fluid regeneration method can avoid or delay the overall replacement of the machining fluid during the machining production process, thereby greatly reducing the production cost, reducing the production cost by 80%, and improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 The machining fluid regeneration method is shown in the step flow of one embodiment.

[0048] Figure 2 The machining fluid regeneration method is shown in the device used in one embodiment. DETAILED DESCRIPTION

[0049] The machining fluid regeneration method will be further explained and described below in conjunction with the drawings and specific examples in the specification, but the explanation and description do not constitute undue limitations on the technical solutions of the present application.

[0050] Figure 1 The machining fluid regeneration method is shown in the step flow of one embodiment.

[0051] As Figure 1 shown, in some embodiments, the machining fluid regeneration method can include the steps of:

[0052] Step 000: The machining fluid used in the production line is filtered multiple times to remove the metal particle impurities remaining in the machining fluid during the machining process, to obtain the pretreated machining fluid.

[0053] In some more specific embodiments, the filtering can include: screen filtering, filter paper suction filtering, vibration filter membrane filtering, and three times filtering. The above filtering means are existing technical means, which will not be described here.

[0054] Step 100: electrolyzing the used cutting fluid with an electrolysis device to make the chloride ions in the used cutting fluid adsorbed and gathered on the anode and oxidized into chlorine gas.

[0055] In some more specific embodiments, the pretreated cutting fluid is added into the electrolysis device, and graphite electrodes are used as the anode and cathode to electrolyze the cutting fluid. The power supply makes the chloride ions in the cutting fluid adsorbed and gathered on the anode and partially oxidized to generate chlorine gas, while the cathode reduces the water molecules in the cutting fluid to generate hydrogen gas and hydroxyl ions, thereby enhancing the alkalinity of the cutting fluid. The gas generated by the electrolysis device is discharged, and the chlorine gas generated by the anode is adsorbed by a sodium hydroxide solution. The byproduct hydrogen gas generated by the electrolysis is collected by a drying device and a gas collection device.

[0056] In some preferred embodiments, the electrolysis voltage is set to 3-5V. Setting the voltage in this range can remove a large amount of chloride ions in the cutting fluid. Table 1 lists the comparison of the chloride ion removal effect of a single electrolysis under different voltages.

[0057] Table 1.

[0058] Test item Untreated 1.5V 2V 3V 5V 6V Chloride content 383 ppm 361 ppm 345 ppm 322 ppm 303 ppm 284 ppm Cutting fluid concentration 10 wt% 10 wt% 10 wt% 10 wt% 10 wt% 9.6 wt%

[0059] Note: When the voltage is lower than 1.5V, no gas will be generated at the electrode, so when the voltage is ≤1.5V, only the electric adsorption process exists and no electrolysis reaction occurs. Since the cutting fluid is prepared by diluting the cutting fluid concentrate with water, the concentration of the cutting fluid refers to the concentration of the cutting fluid concentrate.

[0060] The inventors found through experiments that when the voltage is selected as 3-5V, the chloride ions in the cutting fluid can be greatly reduced, and the effective components of the cutting fluid will not be removed (i.e., the concentration of the cutting fluid will not decrease). However, if the voltage continues to increase, the effective components of the cutting fluid will be lost. Therefore, the electrolysis voltage should be selected within the range of 3-5V.

[0061] In addition, the inventors calculated from the experimental data that a graphite electrode with a surface area of 1m 2 can remove about 4.8mg of chloride ions. The single electrolysis of the graphite electrode for about 30min will reach saturation, so the single electrolysis time can be controlled to 30min.

[0062] As described above, since the electrolytic activity of the electrode surface decreases after 30min of electrolysis each time, the chloride ion concentration reduction effect is no longer obvious, so the electrode can be regenerated once every 30min or so of electrolysis. In some more specific embodiments, the electrode regeneration is to empty the cutting fluid under power supply, then turn off the power and flush the electrode surface with deionized water to remove the ions adsorbed on the electrode surface, restore the adsorption activity of the electrode, and achieve the regeneration of the electrode.

[0063] Table 2 lists the test parameters of the cutting fluid after the complete electrolysis step (multiple electrode regeneration and multiple electrolysis) to remove chloride ions and the cutting fluid during online use.

[0064] Table 2.

[0065] Test item Process requirement Used cutting fluid Electrolysed cutting fluid Chloride content ≤ 150 ppm 285 ppm 133 ppm Conductivity ≤ 5000 μs / cm 5960 μs / cm 5620 μs / cm pH 8.5-9.5 8.8 8.87 Cutting fluid concentration (refractometric method) 8-11 wt% 10 wt% 10 wt%

[0066] As can be seen from Table 2, after the electrolysis step, the concentration of chloride ions in the cutting fluid is greatly reduced, the pH value is slightly increased, the conductivity is decreased, but the decrease is not very obvious, and the remaining properties meet the standard.

[0067] Therefore, in order to further reduce the conductivity and at the same time adjust the pH value of the cutting fluid to maintain it within the process standard, the next step 200 is performed: the used cutting fluid is passed through a hydrogen type cation exchange resin so that the hydrogen functional groups of the hydrogen type cation exchange resin and the metal cations in the cutting fluid undergo a displacement reaction.

[0068] In some embodiments, the hydrogen type cation exchange resin can be an acidic styrene resin or the like.

[0069] Figure 2 A device for implementing step 200 of the cutting fluid regeneration method according to the present application in one embodiment is shown.

[0070] As Figure 2 shown, the cutting fluid after electrolysis is introduced into the cutting fluid resin treatment device 17 through the cutting fluid bottom inlet 11 of the cutting fluid resin treatment device 17, passes through the hydrogen type cation exchange resin 16, and flows out from the top outlet 12. The hydrogen type cation exchange resin 16 is provided with a quartz sand layer 15 above it for filtration. This "bottom-in top-out" form can increase the contact time of the cutting fluid with the hydrogen type cation exchange resin. After ion exchange is completed, the cutting fluid can be temporarily stored in the cutting fluid storage device. The hydrogen type cation exchange resin can adsorb metal cations such as iron ions, aluminum ions, and copper ions dissolved in the cutting fluid during machining, further reducing the conductivity of the cutting fluid; at the same time, hydrogen ions in the resin are replaced into the cutting fluid, neutralized with the hydroxyl ions generated during electrolysis, and the pH value is adjusted to be stable within the process requirement range.

[0071] In some more specific embodiments, the used cutting fluid is passed through the hydrogen type cation exchange resin at a flow rate of 2-10 ml / min, and more preferably, the used cutting fluid is passed through the hydrogen type cation exchange resin at a flow rate of 5 ml / min.

[0072] In some more specific embodiments, the volume ratio of the cutting fluid to the hydrogen type cation exchange resin can be (120-160): 1.

[0073] The inventor tested the effect of different volume ratios of hydrogen type cation exchange resin to cutting fluid on conductivity and cutting fluid pH value, which are listed in Table 3, and accordingly concluded that the optimal volume ratio of cutting fluid to hydrogen type cation exchange resin is 150:1.

[0074] Table 3.

[0075]

[0076] When the conductivity and pH value of the regenerated cutting fluid are found to be significantly increased by monitoring the index parameters, it is proved that the hydrogen type cation exchange resin reaches the adsorption limit, and thus can be regenerated.

[0077] As Figure 2 shown in some embodiments, the cutting fluid in the cutting fluid resin treatment device 17 supported by the bracket 18 is first emptied, and deionized water is injected from the regeneration liquid inlet 13 at the top of the cutting fluid resin treatment device to flush the hydrogen type cation exchange resin 16 until the liquid flowing through the hydrogen type cation exchange resin is neutral, wherein the flushing liquid is discharged from the bottom outlet 14. Then, an organic solvent such as ethanol is added from the regeneration liquid inlet 13 at the top of the cutting fluid resin treatment device 17 to soak the hydrogen type cation exchange resin for 1-2h, so as to elute the organic substances in the cutting fluid adsorbed on the surface of the hydrogen type cation exchange resin. Subsequently, the hydrogen type cation exchange resin is again flushed with deionized water until the organic solvent is washed out. Then, an acidic liquid is selected as the regeneration liquid, such as 3%-5% mass fraction of hydrochloric acid, and the regeneration liquid is added from the regeneration liquid inlet 13 at the top of the cutting fluid resin treatment device in a volume ratio of 1:3 of the hydrogen type cation exchange resin to the regeneration liquid, and is left to stand for 4h to regenerate the hydrogen type cation exchange resin, and the regeneration liquid is discharged from the bottom outlet 14. The hydrogen type cation exchange resin is again flushed with deionized water injected from the regeneration liquid inlet 13 at the top until the liquid flowing through the hydrogen type cation exchange resin is neutral.

[0078] After the above steps, the chloride content and conductivity of the cutting fluid can be significantly reduced.

[0079] More preferably, after step 200, step 300 can also be continued: the used cutting fluid is passed through the hydrogen-oxygen type anion exchange resin, so that the hydroxyl functional groups of the hydrogen-oxygen type anion exchange resin and the chloride ions in the cutting fluid undergo a displacement reaction.

[0080] In this preferred embodiment, the hydrogen-type cation exchange resin employed in step 200 before step 300 can also prevent the hydrogen-oxygen type anion exchange resin from being poisoned by metal cations in the cutting fluid, thereby affecting the adsorption performance of the hydrogen-oxygen type anion exchange resin, while the generated hydrogen ions can neutralize the hydroxyl ions generated during the adsorption step of the hydrogen-oxygen type anion exchange resin, thereby stabilizing the pH value within the process requirement range.

[0081] In which the hydrogen-oxygen type anion exchange resin undergoes a displacement reaction with the chloride ions in the cutting fluid, which can further reduce the conductivity of the cutting fluid and further remove chloride ions, while the displaced hydroxyl ions are neutralized by the hydrogen ions generated in the hydrogen-type cation exchange resin adsorption step, thereby making the present application have a more optimal implementation effect.

[0082] In some more specific embodiments, the treatment of the cutting fluid by the hydrogen-oxygen type anion exchange resin can also use the device as shown in Figure 2 , in which the "16" hydrogen-type cation exchange resin is replaced by the hydrogen-oxygen type anion exchange resin.

[0083] In some embodiments, the hydrogen-oxygen type anion exchange resin can be a gel-type resin with a polystyrene skeleton.

[0084] In some embodiments, the volume ratio of the hydrogen-type cation exchange resin to the hydrogen-oxygen type anion exchange resin can be (0.5-1.5): 1.

[0085] Preferably, the volume ratio of the hydrogen-type cation exchange resin to the hydrogen-oxygen type anion exchange resin can be 1:1.

[0086] More preferably, when the volume ratio of the hydrogen-type cation exchange resin to the hydrogen-oxygen type anion exchange resin is 1:1, the volume ratio of the used cutting fluid to the hydrogen-oxygen type anion exchange resin is also 150:1.

[0087] In addition, in some more specific embodiments, the used cutting fluid is passed through the hydrogen-oxygen type anion exchange resin at a flow rate of 2-10 ml / min.

[0088] More preferably, the used cutting fluid is passed through the hydrogen-oxygen type anion exchange resin at a flow rate of 5 ml / min.

[0089] Using this flow rate can further improve the efficiency of cutting fluid treatment.

[0090] In addition, the hydroxyl type anion exchange resin reaches an adsorption limit after being used for a period of time, and thus can be subjected to a regeneration treatment. The regeneration step of the hydroxyl type anion exchange resin can include: emptying the cutting fluid, washing the hydroxyl type anion exchange resin with deionized water until the liquid flowing through the resin is neutral; then soaking the hydroxyl type anion exchange resin with an organic solvent, such as ethanol, for a period of time, such as 1-2 hours, so as to elute the organic substances in the cutting fluid adsorbed on the surface of the hydroxyl type anion exchange resin; then washing the hydroxyl type anion exchange resin again with deionized water until the organic solvent is washed away; then selecting an alkaline liquid as a regeneration liquid, such as selecting a 3%-5% mass fraction sodium hydroxide solution as the regeneration liquid to regenerate the hydroxyl type anion exchange resin, and placing the hydroxyl type anion exchange resin in the regeneration liquid for a period of time, such as 4 hours, so as to regenerate the hydroxyl type anion exchange resin. The hydroxyl type anion exchange resin can be regenerated in a certain proportion, such as the volume ratio of the hydroxyl type anion exchange resin to the regeneration liquid can be 1:3; then, the hydroxyl type anion exchange resin is washed again with deionized water until the liquid flowing through the hydroxyl type anion exchange resin is neutral. Through the regeneration step, the hydroxyl type anion exchange resin can be repeatedly used, so as to greatly reduce the use cost of the hydroxyl type anion exchange resin.

[0091] In an example, the regenerated cutting fluid after the above-mentioned steps 200 and 300 is subjected to index detection, such as detection of the chloride ion content, the conductivity, the pH value and the cutting fluid concentration, and the detection results are listed in Table 4.

[0092] Table 4.

[0093]

[0094] As can be seen from Table 4, after step 200, the chloride ion in the regenerated cutting fluid has been removed to a degree meeting the process requirements, and the conductivity is also reduced. After step 300, the chloride ion content and the conductivity of the cutting fluid are further reduced, so as to have a better technical effect compared to only proceeding to step 200.

[0095] In a few cases, if the cutting fluid concentration is reduced, an appropriate amount of cutting fluid stock solution can also be supplemented to the regenerated cutting fluid according to actual needs.

[0096] As can be seen from the above, the cutting fluid regeneration method can significantly reduce the chloride ion content and the conductivity of the cutting fluid through the cooperation of electrolysis and ion exchange, so as to reduce the chloride ion content in the cutting fluid by 50-60%, reaching the same level as newly prepared cutting fluid, and further significantly reducing the conductivity and improving the rust resistance of the cutting fluid.

[0097] The cutting fluid regeneration method can avoid or delay the overall replacement of the cutting fluid in the machining production process, thereby greatly reducing the production cost, and can reduce the production cost by 80%.

[0098] It should be noted that the prior art part in the protection scope of the present application is not limited to the embodiments given in the present application file, and all prior art, including but not limited to prior patent documents, prior published publications, prior public use, etc., which are not contradictory to the scheme of the present application, can be included in the protection scope of the present application.

[0099] In addition, the combination manner of each technical feature in the present application is not limited to the combination manner recorded in the claims of the present application or the combination manner recorded in the specific embodiments, and all the technical features recorded in the present application can be freely combined or combined in any manner, unless contradictory to each other.

[0100] It should also be noted that the above-mentioned embodiments are only specific embodiments of the present application. Obviously, the present application is not limited to the above-mentioned embodiments, and similar changes or modifications which can be directly derived or easily thought of by those skilled in the art from the disclosure of the present application should all belong to the protection scope of the present application.

Claims

1. A cutting fluid regeneration method characterized by, The method comprises the steps of: 100: electrolyzing the used cutting fluid by using an electrolysis device, so that the chloride ions in the used cutting fluid are adsorbed and gathered on the anode and oxidized into chlorine gas; wherein the electrolysis voltage is 3-5V; 200: passing the used cutting fluid through a hydrogen-type cation exchange resin, so that the hydrogen functional groups of the hydrogen-type cation exchange resin and the metal cations in the cutting fluid undergo a displacement reaction; the volume ratio of the used cutting fluid to the hydrogen-type cation exchange resin is (120-160):1; 300: passing the used cutting fluid through a hydroxyl-type anion exchange resin, so that the hydroxyl functional groups of the hydroxyl-type anion exchange resin and the chloride ions in the cutting fluid undergo a displacement reaction.

2. The cutting fluid regeneration method according to claim 1, characterized by, The volume ratio of the hydrogen-type cation exchange resin to the hydroxyl-type anion exchange resin is (0.5-1.5):

1.

3. The cutting fluid regeneration method according to claim 1, characterized by, In step 300, the used cutting fluid is passed through the hydroxyl-type anion exchange resin at a flow rate of 2-10ml / min.

4. The cutting fluid regeneration method according to claim 1, characterized by, In step 100, the cathode and the anode of the electrolysis device are both graphite electrodes.

5. The cutting fluid regeneration method according to claim 1, characterized by, In step 200, the used cutting fluid is passed through the hydrogen-type cation exchange resin at a flow rate of 2-10ml / min.

6. The cutting fluid regeneration method of claim 1, wherein: Step 100 further comprises: regenerating the electrodes of the electrolysis device; and / or Step 200 further comprises: regenerating the hydrogen-type cation exchange resin; and / or Step 300 further comprises: regenerating the hydroxyl-type anion exchange resin.

7. The cutting fluid regeneration method according to claim 1, characterized by, Before step 100, there is also step 000: filtering the used cutting fluid.

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