A method for purifying wire drawing liquid and its application

Abstract

The present invention provides a method and application for purifying wire drawing liquid, and relates to the field of metal processing technology. Specifically, the purification method comprises the following steps: centrifuging the wire drawing waste liquid to obtain a metal solid phase and a liquid phase; performing oil-water separation on the liquid phase to obtain a second liquid phase; placing the second liquid phase in an electric field for electrodeposition treatment to obtain a third liquid phase with metal ions removed; performing electrostatic adsorption treatment on the third liquid phase to obtain purified wire drawing liquid. The present invention can effectively solve the defects of the need to introduce exogenous chemical agents and cause residual agents in the purification of conventional wire drawing waste liquid. The present invention realizes high-quality and high-efficiency purification of wire drawing liquid through four major processes including centrifugation, oil-water separation, electrodeposition, and electrostatic adsorption, which can make the purification rate of wire drawing waste liquid reach more than 95%, and the recovered wire drawing liquid can be directly reused in the metal wire drawing process, which greatly saves the cost of metal wire production.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, and in particular to a method for purifying a wire drawing liquid and an application thereof. Background Art

[0002] Wire drawing fluid is an industrial lubricant widely used in metal processing technology, especially in the production process of metal wire. The main components of wire drawing fluid usually include organic compounds, mineral oils, emulsifiers, surfactants and antioxidants, etc. These components work together to achieve many important functions such as lubrication, cleaning, cooling and rust prevention. The quality of wire drawing fluid directly affects the surface quality and process performance of metal wire. However, as the metal wire drawing process continues, friction between the metal wire and the die continues to occur, resulting in a lot of metal debris in the wire drawing fluid. These debris particles are small and difficult to handle. If the wire drawing fluid is not purified in time, it will seriously affect the subsequent wire drawing quality. Therefore, it is urgent to develop an effective method for purifying wire drawing fluid and put it into standardized application.

[0003] At present, many companies are unable to effectively purify the wire drawing liquid after using it, which greatly causes waste of wire drawing liquid and increases production costs. The prior art has also been developed to address this drawback and has obtained a series of purification processes for wire drawing liquid. For example, when a type of wire drawing liquid purification device filters the waste liquid, the debris in the waste liquid can easily block the filter screen, so that the operator needs to frequently disassemble and clean the filter screen, which is more complicated to operate. For another example, in the process of treating wire drawing waste liquid, the prior art will add corrosion inhibitors to it. After the wire drawing liquid is purified, these corrosion inhibitors will remain in the wire drawing liquid and cannot be eliminated.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The first purpose of the present invention is to provide a method for purifying drawing liquid, which is mainly used to solve the problem that purification reagents are difficult to separate or eliminate in traditional waste drawing liquid purification processes, or that conventional solid-liquid separation methods require complex replacement or cleaning operations on filter elements, filter screens, etc.

[0006] The second object of the present invention is to provide a method for treating waste drawing liquid.

[0007] The third object of the present invention is to provide a method for preparing a metal wire.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] A method for purifying a wire drawing liquid mainly comprises the following steps:

[0010] (1) centrifuging the wire drawing waste liquid to obtain a metal solid phase and a liquid phase;

[0011] (2) separating the liquid phase into oil and water to obtain a second liquid phase;

[0012] (3) placing the second liquid phase in an electric field for electrodeposition treatment to obtain a third liquid phase from which metal ions are removed;

[0013] (4) The third liquid phase is subjected to electrostatic adsorption treatment to obtain a purified wire drawing liquid.

[0014] A method for treating waste wire drawing liquid comprises the method for purifying the wire drawing liquid.

[0015] A method for preparing a metal wire comprises the method for purifying the wire drawing liquid.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a method for purifying wire drawing liquid, which mainly realizes high-quality and high-efficiency purification of wire drawing liquid through four major processes: centrifugation, oil-water separation, electrodeposition, and electrostatic adsorption. The purification rate of wire drawing waste liquid can reach more than 95%, achieving the purpose of recycling wire drawing waste liquid and greatly saving production costs. Specifically: the present invention first separates metal grinding chips and metal oxides in wire drawing waste liquid from liquid by centrifugal separation, and only needs to control the speed and time of the separator, which is convenient to operate; then the oil and water in the wire drawing liquid obtained above are separated by an oil-water separator, and they are collected separately; then the migration and deposition of charged ions in the electrolyte under the action of the electric field are utilized, so that the metal ions in the separated wastewater are deposited from the solution; finally, the remaining metal grinding chips and metal oxides in the wastewater treated in the above steps are adsorbed by electrostatic adsorption, and finally the purpose of purifying the wire drawing liquid is achieved. DETAILED DESCRIPTION

[0018] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but those skilled in the art will appreciate that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to conventional conditions or conditions recommended by the manufacturer. Those who do not specify the manufacturer for reagents or instruments used are conventional products that can be purchased commercially. In addition, the terms "first", "second" and "third" are only used for descriptive purposes and cannot be interpreted as indicating or implying relative importance.

[0019] The first aspect of the present invention is to provide a method for purifying wire drawing liquid, which mainly comprises the following steps (1) to (4) performed in sequence; specifically: (1) centrifuging the wire drawing waste liquid to obtain a metal solid phase and a liquid phase; (2) separating the liquid phase from oil and water to obtain a second liquid phase; (3) placing the second liquid phase in an electric field for electrodeposition treatment to obtain a third liquid phase with metal ions removed; (4) subjecting the third liquid phase to electrostatic adsorption treatment to obtain purified wire drawing liquid.

[0020] As a preferred embodiment, the wire drawing waste liquid refers to the waste liquid of the wire drawing liquid used in the metal wire production process which loses its functional effect after a period of use; conventional wire drawing liquids in this field include: organic compounds containing at least one of organic acids, organic alcohols or organic esters, or one or more of lubricants, emulsifiers, surfactants, antioxidants, precipitants, bactericides, etc., and there are also some innovative wire drawing liquids with unconventional ingredients in this field; however, the present invention does not impose any restrictions on the composition of the wire drawing liquid. The wire drawing liquid can be a commodity with conventional ingredients or an unconventional undisclosed product as long as it meets the liquid material state; that is, any waste liquid of the wire drawing liquid can be purified and reused by the purification method of the present invention.

[0021] As a preferred embodiment, the wire drawing waste liquid includes but is not limited to waste wire drawing liquid produced by the wire drawing process of metals such as gold, silver, iron, copper, stainless steel, and aluminum; however, when the wire drawing waste liquid of the present invention is only the wire drawing waste liquid of gold wire, the electroplating treatment in step (3) of the present invention can be optionally omitted or the time of the electroplating treatment can be adaptively reduced. This is because the chemical properties of gold are stable and it may not be oxidized to generate gold ions that enter the wire drawing liquid during the wire drawing process.

[0022] As a preferred embodiment, before step (1), the method further includes: centrally collecting the waste drawing liquid; and directly storing the waste drawing liquid in the centrifugal treatment equipment or transferring it to a container for storage according to the processing scale of the waste drawing liquid.

[0023] As a preferred embodiment, the centrifugal treatment speed is 3000rpm~5000rpm, and the centrifugal treatment time is 0.5h~1h; in some optional embodiments, the centrifugal treatment speed includes but is not limited to any one of 3000, 3200, 3500, 3800, 4000, 4200, 4500, 4800, 5000 (rpm) or a numerical range composed of any two of them, and the centrifugal treatment time includes but is not limited to any one of 0.5, 0.6, 0.7, 0.8, 0.9, 1 (h) or a numerical range composed of any two of them.

[0024] As a preferred embodiment, the equipment for the centrifugal treatment includes but is not limited to centrifugal separation equipment such as a barrel centrifuge, a disc centrifuge, and a sedimentation centrifuge. Those skilled in the art can make a reasonable selection based on the scale of the centrifugal treatment and the equipment cost.

[0025] In the present invention, large particles or high-size metal solid phases in the wire drawing waste liquid are firstly separated by centrifugal treatment, which can effectively avoid the need to replace or clean key components such as filter elements or filter screens compared to filtering, suction filtration, etc. The metal solid phase separated by the centrifugal treatment usually includes metal grinding chips and metal oxides, etc., and various metal solid phase components are produced according to the application scenario of the wire drawing liquid. In some common implementations, the obtained metal grinding chips include gold, silver, copper, etc., and the metal oxides include silver oxide and copper oxide, etc.

[0026] As a preferred embodiment, the working temperature of the oil-water separation is 15°C to 60°C; it is understandable that the working temperature refers to the temperature of the waste drawing liquid to be treated during the oil-water separation process, which can generally be achieved by the constant temperature function of the oil-water separation equipment, or by additional heating equipment before entering the oil-water separation equipment. In some optional embodiments, the working temperature of the oil-water separation includes but is not limited to any one of 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 (°C) or a numerical range consisting of any two of them.

[0027] As a preferred embodiment, the processing capacity of the oil-water separation is 80L / h to 120L / h; in some optional embodiments, the processing capacity of the oil-water separation includes but is not limited to any one of 80, 85, 90, 95, 100, 105, 110, 115, 120 (L / h) or a numerical range consisting of any two. However, it is worth noting that the processing capacity provided by the present invention is only the preferred processing capacity for conventional large-scale oil-water separators on the market. If it is in an experimental scenario or a processing scenario of a customized oil-water separation device, those skilled in the art can comprehensively adjust the processing capacity according to the operating equipment and the oil-water separation effect.

[0028] In the present invention, the oil phase and the water phase in the wire drawing waste liquid are obtained by oil-water separation (wherein the second liquid phase corresponds to the water phase in the subsequent operation), and the separated oil phase can be cleaned and green treated or separated and reused. The oil phase in the wire drawing waste liquid in the art may be derived from the lubricating oil, cutting oil or cooling oil used in the metal wire drawing process, and is mixed with the wire drawing liquid phase during the cutting process. In this step, these oil phases are separated to avoid interference with the subsequent separation of metal ions and metal chips.

[0029] As a preferred embodiment, the electrodeposition treatment includes the following steps: placing an electrode in the second liquid phase, connecting the electrode cathode to the negative pole of the power supply, connecting the electrode anode to the positive pole of the power supply, and then starting the power supply for electrodeposition, so that the metal ions in the second liquid phase are deposited to obtain a third liquid phase with the charged ions removed.

[0030] As a more preferred embodiment, the cathode adopts one of a pure copper electrode or a pure silver electrode, and the anode adopts a high-purity graphite electrode; in some optional embodiments, those skilled in the art can select and adjust the shape of the electrode according to the equipment for the electrodeposition treatment, such as block, plate, rod, etc.

[0031] As a more preferred embodiment, the deposition current density is 1A / dm 2 ~5A / dm 2 , the deposition voltage is 1.5V to 3V; in some optional embodiments, the deposition current density includes but is not limited to 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5 (A / dm 2 ), and the deposition voltage includes but is not limited to 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3 (V) or a numerical range composed of any two of them.

[0032] As a further preferred embodiment, the power-on time of the electrodeposition treatment is 10 min to 30 min; in some optional embodiments, the power-on time includes but is not limited to any one of 10, 12, 15, 18, 20, 22, 25, 28, 30 (min) or a numerical range consisting of any two. It is understandable that the power-on time provided is a preferred method provided under the above current and voltage conditions, and the purpose is to completely deposit the metal ions (mainly silver ions and copper ions) in the second liquid phase to the electrode; those skilled in the art can comprehensively adjust the power-on time and power supply parameters according to the ion concentration.

[0033] As a preferred embodiment, the electrostatic adsorption treatment comprises the following steps: generating a high-voltage electrostatic field through an electrostatic generator, placing the third liquid phase in the electrostatic field, removing metal particles through adsorption, and obtaining a purified wire drawing liquid. In the present invention, low-particle-size metal chips and metal oxides are further adsorbed through electrostatic adsorption to effectively purify the wire drawing liquid.

[0034] As a more preferred embodiment, the electrostatic voltage of the electrostatic field is 1000V to 5000V; in some optional embodiments, the electrostatic voltage of the electrostatic field includes but is not limited to any one of 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000 (V) or a numerical range consisting of any two of them.

[0035] As a more preferred embodiment, the time of the electrostatic adsorption treatment is ≥ 15 min; in a further preferred embodiment, the time of the electrostatic adsorption treatment is controlled between 15 min and 60 min.

[0036] In the present invention, the soluble and insoluble metal components in the aqueous phase of the drawing liquid are separated correspondingly by electric field action and electrostatic adsorption, thereby efficiently separating the metal components by physical means while achieving a very high metal separation rate. Compared with the method of adding chemical agents, it can effectively avoid introducing impurity components that are difficult to completely remove into the drawing liquid. It is understandable that the purification method of the present invention does not include any operation steps of adding exogenous agents.

[0037] As a preferred embodiment, the metal solid phase obtained in step (1), the deposited metal obtained at the electrode in step (3), and the adsorbed metal obtained in step (4) can be combined, classified and recycled by those skilled in the art; in some optional embodiments, the recovered metals are classified and separated, or re-melted for reuse.

[0038] The second aspect of the present invention is to provide a method for treating waste drawing liquid, including the purification method of the drawing liquid. It is understandable that the method for treating waste drawing liquid, in addition to the purification method described in the first aspect, can also include any conventional or unconventional treatment means, and the treatment method in the second aspect can also involve process means such as the addition of exogenous agents.

[0039] The third aspect of the present invention is to provide a method for preparing a metal wire, including the method for purifying the wire drawing liquid. It is understandable that the preparation method is a combination of the purification method described in the first aspect on the premise of including the metal wire preparation process, and the present invention does not impose any restrictions on the metal wire preparation process.

[0040] Example 1

[0041] This embodiment uses waste copper drawing liquid from a copper wire factory as the initial raw material; its main components include drawing stock solution, copper grinding chips, copper ions, etc.; after testing, the content of copper grinding chips in the waste copper drawing liquid is 600 mg / L, and the content of copper ions is 200 mg / L.

[0042] The purification method of this embodiment comprises the following steps:

[0043] S1: The copper wire drawing waste liquid is collected into a processor, and then the wire drawing liquid is centrifuged at a speed of 3000r / min for 0.5h using a centrifugal separator to separate most of the copper chips and oxidized copper chips to obtain the wire drawing waste liquid containing trace grinding chips.

[0044] S2: At an operating temperature of 25°C, use an oil-water separator to separate the oil and water from the centrifuged waste liquid.

[0045] S3: Place the two electrodes of electrodeposition into the separated wastewater, connect the cathode to the negative pole of the power supply, and the anode to the positive pole of the power supply. Set the current density to 3A / dm 2 After power is turned on, the deposition continues for 20 minutes, so that copper ions are deposited at the cathode.

[0046] S4: By electrostatic adsorption, a high-voltage electrostatic field is generated by connecting an electrostatic generator to an electrode, and the electrostatic voltage is set to 3000V; the remaining trace copper chips and copper oxide chips in the wire drawing waste liquid are adsorbed and collected to obtain the purified wire drawing liquid of this embodiment.

[0047] Example 2

[0048] The same copper wire drawing waste liquid as in Example 1 is used; the purification method is basically the same as in Example 1, except that the current density in step S3 is set to 1A / dm 2 , deposition continued for 30 min after power was turned on.

[0049] Example 3

[0050] The same copper wire drawing waste liquid as in Example 1 is used; the purification method is basically the same as in Example 1, with the only difference being that the static voltage is set to 4000V in step S4.

[0051] Comparative Example 1

[0052] The same copper wire drawing waste liquid as in Example 1 is used; the purification method is basically the same as in Example 1, with the only difference being that step S3 is eliminated.

[0053] Comparative Example 2

[0054] The same copper wire drawing waste liquid as in Example 1 is used; the purification method is basically the same as in Example 1, with the only difference being that step S4 is eliminated.

[0055] Example 4

[0056] This embodiment uses waste silver drawing liquid from a silver wire factory as the initial raw material; its main components include drawing stock solution, silver grinding chips, silver ions, etc.; after testing, the content of silver grinding chips in the waste silver drawing liquid is 500 mg / L, and the content of silver ions is 100 mg / L.

[0057] S1: The silver wire drawing waste liquid is collected into a processor, and then the wire drawing liquid is centrifuged at a speed of 3000r / min for 0.6h using a centrifugal separator to separate most of the silver flakes and oxidized silver flakes to obtain the wire drawing waste liquid containing trace amounts of abrasive chips.

[0058] S2: At an operating temperature of 25°C, use an oil-water separator to separate the oil and water from the centrifuged waste liquid.

[0059] S3: Put the two electrodes of electrodeposition into the separated wastewater, connect the cathode to the negative pole of the power supply, and connect the anode to the positive pole of the power supply. The current density is 2A / dm 2 After power is turned on, the deposition continues for 15 minutes, so that the silver ions are deposited at the cathode.

[0060] S4: By electrostatic adsorption, an electrostatic generator is connected to an electrode to generate a high-voltage electrostatic field, and the electrostatic voltage is set to 4000V; the remaining trace silver flakes and oxidized silver flakes in the wire drawing waste liquid are adsorbed and collected to obtain the purified wire drawing liquid of this embodiment.

[0061] Example 5

[0062] The same silver wire drawing waste liquid as in Example 4 is used; the purification method is basically the same as in Example 4, except that the current density is set to 5A / dm in step S3 2 , deposition continued for 10 min after power was turned on.

[0063] Example 6

[0064] The same silver wire drawing waste liquid as in Example 4 is used; the purification method is substantially the same as in Example 4, with the only difference being that the static voltage is set to 2000V in step S4.

[0065] Comparative Example 3

[0066] The same silver wire drawing waste liquid as in Example 4 is used; the purification method is basically the same as in Example 4, with the only difference being that step S3 is eliminated.

[0067] Comparative Example 4

[0068] The same silver wire drawing waste liquid as in Example 4 is used; the purification method is basically the same as in Example 4, with the only difference being that step S4 is eliminated.

[0069] Example 7

[0070] This embodiment uses the waste gold drawing liquid from a gold wire factory as the initial raw material; its main components include drawing stock solution, gold grinding chips, etc.; after testing, the content of gold grinding chips in the waste gold drawing liquid is 300 mg / L. Since the gold ion content may be extremely trace, affected by the detection equipment and detection accuracy, no gold ions were detected in the waste gold drawing liquid.

[0071] S1: Collect the gold wire drawing waste liquid into the processor, and then use a centrifugal separator to centrifuge the wire drawing liquid at a speed of 3000r / min for 0.5h to separate most of the gold chips and obtain the wire drawing waste liquid containing trace grinding chips.

[0072] S2: At an operating temperature of 30°C, use an oil-water separator to separate the oil and water in the centrifuged waste liquid.

[0073] S3: Put the two electrodes of electrodeposition into the separated wastewater, connect the cathode to the negative pole of the power supply, and connect the anode to the positive pole of the power supply. The current density is 1A / dm 2 After power is turned on, the deposition continues for 10 minutes, so that the gold ions are deposited at the cathode.

[0074] S4: by electrostatic adsorption, a high-voltage electrostatic field is generated by connecting an electrostatic generator to an electrode, and the electrostatic voltage is set to 4000V; the trace gold chips remaining in the wire drawing waste liquid are adsorbed and collected to obtain the purified wire drawing liquid of this embodiment.

[0075] Comparative Example 5

[0076] The same gold wire drawing waste liquid as in Example 7 is used; the purification method is basically the same as in Example 7, with the only difference being that step S3 is eliminated.

[0077] Comparative Example 6

[0078] The same gold wire drawing waste liquid as in Example 7 is used; the purification method is basically the same as in Example 7, with the only difference being that step S4 is eliminated.

[0079] Test Example 1

[0080] Wire drawing was performed using the wire drawing liquid purified in each embodiment; specifically, embodiments 1 to 3 were used in a copper wire drawing production line, embodiments 4 to 6 were used in a silver wire drawing production line, and embodiment 7 was used in a gold wire drawing production line. The corresponding copper wire, silver wire, and gold wire had good surface quality, without scratches, strains, or breaks. It can be seen that the present invention achieves the purpose of purifying and recycling the wire drawing liquid, greatly reducing the production cost.

[0081] Test Example 2

[0082] The purification rate was calculated by testing the contents of metal ions and metal debris in the purified wire drawing liquid of each embodiment and comparative example.

[0083] The purification rate is calculated using the following formula:

[0084]

[0085] Wherein, K represents the purification rate of wire drawing waste liquid, dimensionless; C 磨屑净化前 Represents the metal debris content before purification, C 离子净化前 Represents the metal ion content before purification, C 磨屑净化后 Represents the content of metal debris after purification, C 离子净化后 represents the metal ion content after purification, and the unit is mg / L. Table 2 shows the metal ion and wear debris content of each embodiment and comparative example before and after purification, as well as the calculated purification rate value.

[0086] Table 1

[0087]

[0088] It can be clearly seen from Table 1 that the purification method of the present invention can effectively separate and recover the metals in the ionic state and solid phase grinding debris state in the wire drawing waste liquid, and the purification rate can be stably greater than 95%. It should be noted that in Comparative Example 5, there is also a relatively good purification performance, because for the gold wire drawing waste liquid, the gold ion content is extremely low, so the electrodeposition treatment has almost no effect on the purification rate; however, in consideration of the thoroughness and repeatability of the purification results, in order to prevent trace gold ions from affecting the purification rate of the wire drawing liquid, the electrodeposition process is still retained in the purification method of the present invention.

[0089] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. A method for purifying a wire drawing liquid, characterized in that: The steps include: (1) centrifuging the wire drawing waste liquid to obtain a metal solid phase and a liquid phase; (2) separating the liquid phase into oil and water to obtain a second liquid phase; (3) placing the second liquid phase in an electric field for electrodeposition treatment to obtain a third liquid phase from which metal ions are removed; (4) The third liquid phase is subjected to electrostatic adsorption treatment to obtain a purified wire drawing liquid.

2. The method for purifying wire drawing liquid according to claim 1, characterized in that: The rotation speed of the centrifugal treatment is 3000 rpm to 5000 rpm, and the time of the centrifugal treatment is 0.5 h to 1 h.

3. The method for purifying wire drawing liquid according to claim 1, characterized in that: When the oil-water separation is performed, the temperature of the liquid phase is 15°C to 60°C.

4. The method for purifying wire drawing liquid according to claim 1, characterized in that: The electrodeposition process comprises the following steps: The electrode is placed in the second liquid phase, the electrode cathode is connected to the negative pole of the power supply, the electrode anode is connected to the positive pole of the power supply, and then the power supply is started for electrodeposition, and the third liquid phase is obtained after deposition.

5. The method for purifying wire drawing liquid according to claim 1, characterized in that: The current density of the electrodeposition treatment is 1A / dm 2 ~5A / dm 2 The voltage of the electrodeposition treatment is 1.5V to 3V.

6. The method for purifying wire drawing liquid according to claim 1, characterized in that: The power-on time of the electrodeposition treatment is 10 minutes to 30 minutes.

7. The method for purifying wire drawing liquid according to claim 1, characterized in that: The electrostatic adsorption process comprises the following steps: A high-voltage electrostatic field is generated by an electrostatic generator, and the third liquid phase is placed in the electrostatic field, and then a purified wire drawing liquid is obtained.

8. The method for purifying wire drawing liquid according to claim 1, characterized in that: The electrostatic voltage of the electrostatic adsorption treatment is 1000V to 5000V.

9. A method for treating waste drawing liquid, characterized in that: A method for purifying wire drawing liquid comprising the method as described in any one of claims 1 to 8.

10. A method for preparing a metal wire, characterized in that: A method for purifying wire drawing liquid comprising the method as described in any one of claims 1 to 8.

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