Cutting waste liquid and cutting washing water on-site recycling device and method

Abstract

The present application relates to a kind of cutting waste liquid, cutting washing water in situ recycling device and method.Cutting waste liquid in situ recycling device, by pipeline sequentially connected deslagging machine, bag filter, stock solution collection barrel, transfer barrel, automatic filter, filtrate recycling barrel composition, the transfer barrel is connected by pipeline respectively and communicates clean water washing barrel and concentrated solution collection barrel.The present application is classified according to the characteristics of cutting waste liquid and cutting washing water processing, recycling to respective process, more easily realize the recycling of waste water;By controlling the precision of small automatic filter nanometer ceramic membrane, harmful substances in cutting waste liquid are removed in time, useful substances are retained, and cutting waste liquid recycling rate is improved;By large automatic filter, visible suspended solids in washing water are removed, washing water is recycled, when washing water recycling effect reduces, combined with filtrate evaporation equipment is concentrated, condensed water is recycled, and concentrated liquid is outsourced disposal.

Description

Technical Field

[0001] This invention belongs to the field of industrial waste acid treatment technology, and specifically relates to a device and method for in-situ reuse of cutting waste fluid and cutting washing water. Background Technology

[0002] With the development of China's industrial technology, the metal processing industry, especially aerospace, automotive parts, steel processing, and precision machining (CNC) of hardware, is using increasingly larger quantities of cutting fluid. In the metal processing field, emulsions are commonly used for cooling, lubrication, and cleaning of machine parts during cutting, grinding, and rolling processes. After repeated use, the performance of emulsions deteriorates due to contamination by impurities, leading to their replacement and disposal. For example, deteriorated mineral oils may develop a putrid odor, thus forming waste cutting fluid. Waste cutting fluid is generally milky white or grayish white in color and mainly contains water, emulsifiers, machine oil, mineral oil, lubricants, additives, soluble organic matter, metal powder, and suspended solids.

[0003] Cutting waste fluid can be divided into high-concentration cutting waste fluid generated from the cutting of machine parts and cutting wash water generated from grinding and rolling processes. Cutting waste fluid contains a large number of useful components. After removing the oils and suspended solids that cause odor, it can be reused. Cutting wash water mainly contains surfactants and a small amount of cutting waste fluid, and can also be reused after treatment. At present, the difficulty in cutting waste fluid treatment is the presence of emulsifiers, which make the oil, emulsifiers and water in the cutting waste fluid form a very stable emulsion system, and the components are not easy to separate. Cutting wash water contains a large amount of surfactants, which are not easy to treat biochemically. During the recycling process, it will continue to accumulate until it is unusable. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for in-situ reuse of cutting waste fluid and cutting washing water. The device classifies and treats the cutting waste fluid and cutting washing water according to their characteristics and reuses them in their respective processes, making it easier to achieve wastewater reuse. The device is simple to operate and has a good treatment effect.

[0005] The technical solution of the present invention is the cutting waste fluid in-situ reuse device, which is characterized by comprising a slag remover, a bag filter, a raw liquid collection tank, a transfer tank, an automatic fine filter, and a filtrate reuse tank connected in sequence by pipelines. The transfer tank is connected to a clean water washing tank and a concentrated liquid collection tank by pipelines. The automatic fine filter consists of a circulating pump, a nano-ceramic membrane module connected in series with membrane tubes, a chemical washing tank connected by the output pipeline of the nano-ceramic membrane module, an air compressor, and an electric backwashing device whose compressed gas from the air compressor is connected in sequence by pipelines.

[0006] Preferably, the slag remover includes a cylinder and a detachable top cover. The detachable top cover has a feed inlet on its top, and the feed inlet is connected to a steel wire hose. The cylinder contains, from top to bottom, a stainless steel filter screen, an impeller, an air inlet, an air outlet, and a discharge outlet. The discharge outlet is located at the bottom of the cylinder. The stainless steel filter screen is placed on the upper layer of the cylinder and has a pore size of 1.8 mm. The top of the stainless steel filter screen has a filter screen carrying handle. The air inlet and air outlet are symmetrically opened on both sides of the impeller and fixed to the lower layer of the cylinder.

[0007] Another technical solution of the present invention is the method for in-situ reuse of cutting waste fluid, which is characterized by including the following steps:

[0008] (1) Collect by category: collect cutting waste fluid and cutting washing water separately;

[0009] (2) Slag removal: Use a slag remover to filter out metal chips, mud and suspended solids of >1.8 mm from the cutting waste fluid;

[0010] (3) Coarse filtration: Use a bag filter to filter out suspended solids >178 microns in the cutting waste fluid; then transfer the filtered cutting waste fluid into a transfer tank;

[0011] (4) Fine filtration: The cutting waste fluid in the transfer tank is filtered using a small automatic fine filter. When the cutting waste fluid flows through the nano-ceramic membrane module, under pressure, the water and small molecule useful components in the waste fluid flow out of the membrane tube along the nanopores perpendicular to the direction of the membrane tube, forming filtrate. The filtrate is discharged into the filtrate recycling tank, while the residual oil, suspended solids, and unfiltered water and small molecule useful components are returned to the transfer tank for continued circulation and filtration. The volume continuously decreases. When the volume is concentrated to the set value of the original volume, a concentrate is formed. The concentrate is discharged from the bottom of the transfer tank to the concentrate collection tank.

[0012] Preferably, the slag removal in step (2) further includes:

[0013] (2.1) Tighten the detachable top cover of the slag remover, connect the air source to the air inlet of the slag remover, and after the equipment is running, the cutting waste liquid to be processed is pumped into the slag remover from the feed inlet of the slag remover for filtration.

[0014] (2.2) The cutting waste fluid coming out of the slag remover discharge port directly enters the bag filter for filtration, and the filtrate enters the raw liquid collection tank;

[0015] (2.3) When the cutting waste fluid cannot be pumped out, cut off the air supply, open the top cover of the slag remover, take out the stainless steel filter screen full of metal shavings through the filter screen lifting ring, pour the metal shavings into the recycling bag, reinstall the top cover, and continue filtering after turning on the air supply.

[0016] Preferably, the fine filtration in step (4) further includes:

[0017] (4.1) Open the discharge valve of the transfer tank and the return valve of the concentrated liquid to the transfer tank, close the valves of the washing tank and the clean water washing tank, connect the compressed air source, set the backwashing time to 30 min and backwashing 3 s, adjust the air compressor pressure to make the air compressor pressure of the small automatic fine filter ≥ 0.3 MPa, adjust the circulation pump pressure to make the circulation pump pressure of the small automatic fine filter ≥ 0.3 MPa, and start the small automatic precision machine.

[0018] (4.2) Take a sample from the filtrate sampling port and observe whether the cutting waste fluid filtrate contains oil and suspended matter;

[0019] (4.3) When the cutting waste fluid filtrate does not contain oil and suspended matter, open the discharge valve of the small automatic fine filter to discharge the filtrate into the filtrate recycling tank, and adjust the water production valve in the nano-ceramic membrane module so that the average water production of each membrane is between 40 and 60 L / h.

[0020] (4.4) When the volume of waste liquid from cuttings in the transfer tank is 5-10% of the total liquid volume, a concentrate is formed and discharged from the bottom of the transfer tank into the concentrate collection tank;

[0021] (4.5) When the water production of the nano-ceramic membrane module is less than 40L / h, the machine is stopped for cleaning. The cleaning is carried out in the order of water washing-chemical washing-water washing until the water production is restored to 40-60L / h. The wastewater after water washing is directly discharged into the wastewater station, and the wastewater after chemical washing is returned to the chemical washing tank for recycling. When the chemical washing is no longer effective, it is discharged into the wastewater station.

[0022] The third technical solution of the present invention is to provide a cutting waste fluid in-situ reuse device, which is characterized in that the cutting waste fluid in-situ reuse device consists of a raw liquid collection tank, a bag filter, a transfer tank, an automatic fine filter, a filtrate reuse tank, a evaporation and concentration device, and a concentrate collection tank connected in sequence by pipelines; the transfer tank is connected to a clean water washing tank and the concentrate collection tank by pipelines respectively; the automatic fine filter consists of a circulating pump, a nano-ceramic membrane module connected in series with membrane tubes, a chemical washing tank connected by the output pipeline of the nano-ceramic membrane module respectively, an air compressor, and an electric backwashing device connected in sequence by pipelines for the compressed gas of the air compressor; the condensate of the evaporation and concentration device is returned to the filtrate reuse tank by pipelines.

[0023] Preferably, the evaporation and concentration equipment includes an evaporator, a condenser, a vacuum pump, a compressor, a heat exchanger, a circulating pump, and a condensate tank. A first pipe at the top of the evaporator is connected to the condenser. The condenser is connected to the condensate tank via the first pipe and the vacuum pump. The condenser is connected to the heat exchanger via the second pipe and the compressor. The first output pipe of the heat exchanger is connected to the condenser. The second output pipe of the heat exchanger is connected to the evaporator. A third pipe at the bottom of the evaporator is connected to the circulating pump and the heat exchanger. A fourth pipe at the bottom side of the evaporator is connected to the concentrate collection tank. A feed inlet is provided on the side wall of the evaporator.

[0024] The fourth technical solution of the present invention is to provide a method for in-situ reuse of cutting washing water, which is characterized by including the following steps:

[0025] (1) Separate collection: Cutting waste fluid and cutting wash water are collected separately, and the cutting wash water is discharged into the original fluid collection tank;

[0026] (2) Coarse filtration: Use a bag filter to remove suspended solids >178 microns from the cutting wash water;

[0027] (3) Fine filtration: The cutting water in the transfer tank is filtered by a large-scale automatic fine filter. The cutting water flows through the nano-ceramic membrane module to obtain cutting water filtrate and cutting water concentrate. The cutting water filtrate is discharged into the filtrate recycling tank; the cutting water concentrate is returned to the transfer tank to form a closed loop. The volume of the cutting water concentrate continuously decreases. When the volume is concentrated to the set value of the original volume, it forms a concentrate, which is discharged from the bottom of the transfer tank to the concentrate collection tank. The concentrate is disposed of by an external contractor.

[0028] (4) Evaporation and concentration of cutting wash water: When the cutting wash water filtrate is recycled to the point that it can no longer be used, the finely filtered filtrate is evaporated and concentrated using an evaporation and concentration device. The resulting condensate is returned to the filtrate recycling tank for use, and the evaporated concentrate is discharged to the concentrate collection tank for outsourced disposal.

[0029] Preferably, the fine filtration in step (3) further includes:

[0030] (3.1) Open the discharge valve of the transfer tank and the return valve of the concentrate to the transfer tank, close the valves of the washing tank and the clean water washing tank, connect the air source, set the backwashing time to 30 minutes and backwashing for 3 seconds, adjust the air compressor pressure to 0.4-0.6 MPa, adjust the circulation pump pressure to 0.4-0.6 MPa, and start the large automatic precision filter machine.

[0031] (3.2) Take a sample from the cutting water filtrate sampling port and observe whether the cutting water filtrate is clear;

[0032] (3.3) When the cutting washing water filtrate is clear, open the discharge valve of the large automatic fine filter to discharge the filtrate into the filtrate recycling tank, and adjust the water production valve in the nano-ceramic membrane module so that the average water production of each membrane is between 40 and 60 L / h.

[0033] (3.4) When the concentrate of the chip washing water is 1 to 5% of the total liquid volume, it shall be discharged into the concentrate collection tank;

[0034] (3.5) When the water production rate is lower than 40L / h, stop the machine for cleaning. Clean in the order of water washing-chemical washing-water washing until the water production rate recovers to 40-60L / h.

[0035] Preferably, the evaporation and concentration of the cutting wash water in step (4) further includes:

[0036] (4.1) When the cutting washing water filtrate is circulated 5 to 10 times, it is filtered by a large automatic fine filter. The evaporator is made to be under negative pressure by the action of the circulation pump and the vacuum pump, so that the cutting washing water in the filtrate recycling tank is automatically sent to the filtrate evaporation and concentration equipment.

[0037] (4.2) Through its own heat exchange and vacuum evaporation, the water in the cutting water can be rapidly evaporated at a low temperature of 30-40℃;

[0038] (4.3) The condensate formed when the evaporated water vapor encounters the cold air is returned to the filtrate reuse tank;

[0039] (4.4) The concentrated liquid is discharged into the concentrated liquid collection tank and disposed of by an outsourced agent.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] (1) Realize the reuse of cutting waste fluid and washing water: According to the characteristics of cutting waste fluid and cutting washing water, they are classified and treated and reused in their respective processes, making it easier to realize the reuse of wastewater.

[0042] (2) Improve the recycling rate of cutting fluid: By controlling the precision of the nano-ceramic membrane in the automatic fine filter, harmful substances in the cutting fluid can be removed in time while retaining useful substances, thereby improving the recycling rate of the cutting fluid.

[0043] (3) Improve the recycling rate of cutting washing water and reduce the discharge of wastewater: Remove visible suspended solids in the washing water through an automatic fine filter and reuse the washing water. When the washing water reuse effect decreases, concentrate the filtrate by combining it with a filtrate evaporation and concentration equipment, reuse the condensate, and outsource the disposal of a small amount of concentrated liquid. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the in-situ recycling device for cutting waste fluid of the present invention;

[0045] Figure 2This is a schematic diagram of the in-situ recycling device for cutting washing water of the present invention;

[0046] Figure 3 This is a schematic diagram of the evaporation and concentration equipment of the present invention;

[0047] Figure 4 This is a schematic diagram of the slag removal machine of the present invention. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings:

[0049] Please see Figure 1 As shown, the cutting waste fluid in-situ reuse device consists of a slag remover, a bag filter, a raw liquid collection tank, a transfer tank, an automatic fine filter, and a filtrate reuse tank connected in sequence by pipelines. The transfer tank is connected to a clean water washing tank and a concentrated liquid collection tank through pipelines. The automatic fine filter consists of a circulating pump, a nano-ceramic membrane module connected in series with membrane tubes, a chemical washing tank connected to the output pipeline of the nano-ceramic membrane module, an air compressor, and an electric backwashing device whose compressed gas from the air compressor is connected in sequence by pipelines.

[0050] Please see Figure 4 As shown, the slag remover includes a cylinder and a detachable top cover. The detachable top cover has a feed inlet on top, and a 2m long inner steel wire hose is connected to the feed inlet. The cylinder contains, from top to bottom, a stainless steel filter screen, an impeller, an air inlet, an air outlet, and a discharge outlet. The discharge outlet is located at the bottom of the cylinder. The stainless steel filter screen is placed on the upper layer of the cylinder and has a 1.8mm aperture. The top of the stainless steel filter screen has a filter screen lifting ring. The air inlet and air outlet are symmetrically opened on both sides of the impeller and fixed to the lower layer of the cylinder.

[0051] This invention provides a method for in-situ reuse of cutting fluid, comprising the following steps:

[0052] (1) Collect by category: collect cutting waste fluid and cutting washing water separately;

[0053] (2) Slag removal: Use a slag remover to filter out metal chips, mud and suspended solids of >1.8 mm from the cutting waste fluid;

[0054] (3) Coarse filtration: Use a bag filter to filter out suspended solids >178 microns in the cutting waste fluid; then transfer the filtered cutting waste fluid into a transfer tank;

[0055] (4) Fine Filtration: A small automatic fine filter is used to filter the cutting waste fluid in the transfer tank. The cutting waste fluid flows through a nano-ceramic membrane module for fine filtration, obtaining filtrate and concentrate. The filtrate is discharged into a filtrate recycling tank, and the concentrate is returned to the transfer tank, forming a closed-loop cycle. The volume of the concentrate continuously decreases. When the volume is concentrated to a set value of the original volume, a concentrate is formed. The concentrate is discharged from the bottom of the transfer tank to a concentrate collection tank. Under the action of the small automatic fine filter, the useful components and water in the cutting waste fluid form filtrate, which is discharged into the filtrate recycling tank; while the oil and suspended solids in the cutting waste fluid form concentrate, which is returned to the transfer tank, forming a closed-loop cycle. The volume continuously decreases. When the volume is concentrated to a set value of the original volume, a concentrate is formed, which is discharged from the bottom of the transfer tank to a concentrate collection tank. The concentrate is disposed of externally.

[0056] A preferred embodiment is that the slag removal in step (2) further includes:

[0057] (2.1) Tighten the detachable top cover of the slag remover, connect the discharge port of the slag remover to the bag filter with the inner steel wire hose, connect the air source to the air inlet, and after the equipment is running, the cutting waste liquid to be treated is pumped into the slag remover from the feed port of the slag remover for filtration.

[0058] (2.2) The cutting waste fluid coming out of the slag remover discharge port directly enters the bag filter for filtration, and the filtrate enters the raw liquid collection tank;

[0059] (2.3) When the cutting waste fluid cannot be pumped out, cut off the air supply, open the top cover of the slag remover, take out the stainless steel filter screen full of metal shavings through the filter screen lifting ring, pour the metal shavings into the recycling bag, reinstall the top cover, and continue filtering after turning on the air supply.

[0060] A preferred embodiment is that the fine filtration in step (4) further includes:

[0061] (4.1) Open the discharge valve of the transfer tank and the return valve of the concentrated liquid to the transfer tank, close the valves of the washing tank and the clean water washing tank, connect the compressed air source, set the backwashing time to 30 min and backwashing 3 s, adjust the air compressor pressure to make the air compressor pressure of the small automatic fine filter ≥ 0.3 MPa, adjust the circulation pump pressure to make the circulation pump pressure of the small automatic fine filter ≥ 0.3 MPa, and start the small automatic precision machine.

[0062] (4.2) Take a sample from the filtrate sampling port and observe whether the cutting waste fluid filtrate contains oil and suspended matter;

[0063] (4.3) When the cutting waste fluid filtrate does not contain oil and suspended matter, open the discharge valve of the small automatic fine filter to discharge the filtrate into the filtrate recycling tank, and adjust the water production valve in the nano-ceramic membrane module so that the average water production of each membrane is between 40 and 60 L / h.

[0064] (4.4) When the volume of the waste liquid of the cuttings in the transfer tank is 5 to 10% of the total liquid volume, a concentrated liquid is formed and discharged from the bottom of the transfer tank into the concentrated liquid collection tank.

[0065] (4.5) When the water production of the nano-ceramic membrane module is less than 40L / h, the machine is stopped for cleaning. The cleaning is carried out in the order of water washing-chemical washing-water washing until the water production is restored to 40-60L / h. The wastewater after water washing is directly discharged into the wastewater station, and the wastewater after chemical washing is returned to the chemical washing tank for recycling. When the chemical washing is no longer effective, it is discharged into the wastewater station.

[0066] Please see Figure 2 As shown, the cutting water in-situ reuse device provided by the present invention consists of a raw liquid collection tank, a bag filter, a transfer tank, an automatic fine filter, a filtrate reuse tank, a evaporation and concentration device, and a concentrate collection tank connected in sequence by pipelines. The transfer tank is connected to a clean water washing tank and the concentrate collection tank by pipelines. The automatic fine filter consists of a circulating pump, a nano-ceramic membrane module connected in series with membrane tubes, a chemical washing tank connected by the output pipeline of the nano-ceramic membrane module, an air compressor, and an electric backwashing device connected in sequence by pipelines for the compressed gas from the air compressor. The condensate from the evaporation and concentration device is returned to the filtrate reuse tank by pipelines.

[0067] Please see Figure 3 As shown, the evaporation and concentration equipment includes an evaporator, a condenser, a vacuum pump, a compressor, a heat exchanger, a circulating pump, and a condensate tank. A first pipe at the top of the evaporator connects to the condenser. The condenser is connected to the condensate tank via the first pipe and the vacuum pump. The condenser is connected to the heat exchanger via the second pipe and the compressor. The first output pipe of the heat exchanger connects to the condenser. The second output pipe of the heat exchanger connects to the evaporator. A third pipe at the bottom of the evaporator connects to the circulating pump and the heat exchanger. A fourth pipe at the bottom side of the evaporator connects to the concentrate collection tank. A feed inlet is provided on the side wall of the evaporator.

[0068] Another technical solution of the present invention is a method for in-situ reuse of cutting washing water, comprising the following steps:

[0069] (1) Separate collection: Cutting waste fluid and cutting wash water are collected separately, and the cutting wash water is discharged into the original fluid collection tank;

[0070] (2) Coarse filtration: Use a bag filter to remove suspended solids >178 microns from the cutting wash water;

[0071] (3) Fine filtration: The cutting wash water in the transfer tank is filtered by a large automatic fine filter. When the cutting wash water flows through the nano-ceramic membrane module, under pressure, the water and small molecule cleaning agent in the cutting wash water flow out of the membrane tube along the nanopores perpendicular to the direction of the membrane tube, forming filtrate. The filtrate is discharged into the filtrate recycling tank, while the residual oil, suspended solids, and unfiltered water and small molecule cleaning agent are returned to the transfer tank for continued circulation and filtration. The volume is continuously reduced. When the volume is concentrated to the set value of the original volume, a concentrate is formed. The concentrate is discharged from the bottom of the transfer tank to the concentrate collection tank and the concentrate is disposed of by an external party.

[0072] (4) Evaporation and concentration of cutting wash water: When the cutting wash water filtrate is recycled to the point that it can no longer be used, the finely filtered filtrate is evaporated and concentrated using an evaporation and concentration device. The resulting condensate is returned to the filtrate recycling tank for use, and the evaporated concentrate is discharged to the concentrate collection tank for outsourced disposal.

[0073] The fine filtration in step (3) further includes:

[0074] (3.1) Open the discharge valve of the transfer tank and the return valve of the concentrate to the transfer tank, close the valves of the washing tank and the clean water washing tank, connect the compressed air source, set the backwashing time to 30 min and backwashing 3 s, adjust the air compressor pressure to make the air compressor pressure of the large automatic fine filter 0.4~0.6MPa, adjust the circulation pump pressure to make the circulation pump pressure of the large automatic fine filter 0.4~0.6MPa, and start the large automatic precision machine;

[0075] (3.2) Take a sample from the cutting water filtrate sampling port and observe whether the cutting water filtrate is clear;

[0076] (3.3) When the cutting washing water filtrate is clear, open the discharge valve of the large automatic fine filter to discharge the filtrate into the filtrate recycling tank, and adjust the water production valve in the nano-ceramic membrane module so that the average water production of each membrane is between 40 and 60 L / h.

[0077] (3.4) When the concentrate of the chip washing water is 1 to 5% of the total liquid volume, it shall be discharged into the concentrate collection tank;

[0078] (3.5) When the water production rate is lower than 40L / h, stop the machine for cleaning. Clean in the order of water washing-chemical washing-water washing until the water production rate recovers to 40-60L / h.

[0079] Furthermore, the evaporation and concentration of the cutting wash water in step (4) further includes:

[0080] (4.1) When the cutting washing water filtrate is circulated 5 to 10 times, it is filtered by a large automatic fine filter. The evaporator is made to be under negative pressure by the action of the circulation pump and the vacuum pump, so that the cutting washing water in the filtrate recycling tank is automatically sent to the filtrate evaporation and concentration equipment.

[0081] (4.2) Through its own heat exchange and vacuum evaporation, the water in the cutting water can be rapidly evaporated at a low temperature of 30-40℃;

[0082] (4.3) The condensate formed when the evaporated water vapor encounters the cold air is returned to the filtrate reuse tank;

[0083] (4.4) The concentrated liquid is discharged into the concentrated liquid collection tank and disposed of by an outsourced agent.

[0084] The present invention will be further described in detail below with reference to embodiments:

[0085] Example 1: In-situ reuse device for cutting waste fluid and cutting wash water

[0086] like Figure 1 As shown, the cutting waste fluid in-situ reuse device consists of a slag remover, a bag filter, a raw liquid collection tank, a transfer tank, an automatic fine filter, and a filtrate reuse tank connected in sequence by pipelines. The transfer tank is connected to a clean water washing tank and a concentrated liquid collection tank through pipelines. The automatic fine filter consists of a circulating pump, a nano-ceramic membrane module connected in series with membrane tubes, a chemical washing tank connected to the output pipeline of the nano-ceramic membrane module, an air compressor, and an electric backwashing device whose compressed gas from the air compressor is connected in sequence by pipelines.

[0087] like Figure 1 As shown, the automatic fine filter is a small-scale automatic fine filter with a cutting waste fluid processing capacity of 1m³. 3 The circulating pump has a head of 25m and a pressure ≥0.3MPa. The nano-ceramic membrane has a precision of 100~500nm and consists of two 1.2m long, 40mm diameter membrane tubes connected in series. The membrane shell is made of stainless steel. The backwash tank has a volume of 4L. The air compressor pressure is ≥0.3MPa. The clean water washing tank has no return pipe; after clean water washing, the liquid is directly discharged into the wastewater station through the pipe. Wastewater from chemical washing is returned to the chemical washing tank for recycling. When chemical washing no longer achieves its effect, it is discharged into the wastewater station.

[0088] like Figure 1 , Figure 4 As shown, the slag remover is equipped with a feed inlet, a removable top cover, a stainless steel filter screen, an impeller, an air inlet, an air outlet, a discharge outlet, and a cylinder. The feed inlet is located on the top of the removable top cover of the slag remover and is connected to a 2m long inner steel wire hose. The discharge outlet is located at the bottom of the cylinder. The stainless steel filter screen has a 1.8mm aperture and a carrying ring on the top. It is placed on the upper layer of the cylinder and can be lifted out through the carrying ring. The impeller, air inlet, and air outlet are fixed to the lower layer of the cylinder.

[0089] like Figure 2As shown, the in-situ recycling device for cutting washing water consists of a raw liquid collection tank, a bag filter, a transfer tank, an automatic fine filter, a filtrate recycling tank, a evaporation and concentration device, and a concentrate collection tank connected in sequence by pipelines. The transfer tank is connected to the clean water washing tank and the concentrate collection tank by pipelines. The automatic fine filter consists of a circulating pump, a nano-ceramic membrane module connected in series with membrane tubes, a chemical washing tank connected by the output pipeline of the nano-ceramic membrane module, an air compressor, and an electric backwashing device connected in sequence by pipelines for the compressed gas from the air compressor. The condensate from the evaporation and concentration device is returned to the filtrate recycling tank by pipelines.

[0090] like Figure 2 As shown, the automatic fine filter is a large-scale automatic fine filter, and the cutting wash water processing capacity is 30m³. 3 The circulating pump has a head of 30m and a pressure of 0.4-0.6MPa. The nano-ceramic membrane has a precision of 40nm and consists of six 1.2m long, 40mm diameter membrane tubes connected in series. The membrane housing is made of stainless steel. The backwash tank has a volume of 12L, and the air compressor pressure is 0.4-0.6MPa. The clean water washing tank has no return pipe; wastewater after the clean water washing is directly discharged into the wastewater station through the pipe. Wastewater after chemical washing is returned to the chemical washing tank for recycling. It is only discharged into the wastewater station when the chemical washing is no longer effective.

[0091] like Figure 2 , Figure 3 As shown, the evaporation and concentration equipment has a processing capacity of 3t / d and includes an evaporator, a condenser, a vacuum pump, a compressor, a heat exchanger, a circulating pump, and a condensate tank. A first pipe at the top of the evaporator connects to the condenser. The condenser connects to the condensate tank via the first pipe and the vacuum pump. The condenser connects to the heat exchanger via a second pipe and the compressor. The first output pipe of the heat exchanger connects to the condenser, and the second output pipe connects to the evaporator. A second pipe at the bottom of the evaporator connects to the heat exchanger. A third pipe at the bottom side of the evaporator connects to the concentrate tank. A feed inlet is located on the side wall of the evaporator. The main body of the evaporator is made of 316L stainless steel, while the heating tubes of the heat exchanger and the condenser tubes are made of titanium. The area of ​​the heating tube is 1 to 1.5 times the area of ​​the condenser tube.

[0092] Example 2: Slag Removal from Cutting Fluid

[0093] Example 1 uses a slag remover to separate metal shavings from cutting waste fluid while simultaneously collecting the waste fluid. The slag remover is moved near the cutting waste fluid to be treated, the removable top cover is tightened, and the discharge port of the slag remover is connected to the bag filter using a flexible steel wire hose. An air source is connected to the air inlet. After the equipment is running, the cutting waste fluid to be treated is drawn into the slag remover for filtration by holding the flexible steel wire hose at the inlet. The cutting waste fluid exiting the slag remover discharge port directly enters the bag filter for filtration, and the filtrate enters the cutting waste fluid collection tank. When the cutting waste fluid can no longer be drawn, the air source is cut off, the top cover is opened, and the stainless steel filter cartridge filled with metal shavings is removed using the handle. The metal shavings are poured into a recovery bag, the top cover is reinstalled, and the air source is reconnected to continue filtration.

[0094] Example 3: Fine Filtration

[0095] Example 1 was used with a processing capacity of 1m³. 3 The small-scale fine filter filters cutting waste fluid. Open the discharge valve of the transfer tank and the return valve of the concentrate to the transfer tank, close the valves of the chemical washing tank and the clean water washing tank, connect the compressed air source, set the backwash time to 30 minutes and 3 seconds, adjust the air compressor pressure to ≥0.3MPa, adjust the circulating pump pressure to ≥0.3MPa, and start the automatic fine filter; take a sample from the filtrate sampling port to observe whether the cutting waste fluid filtrate contains oil and suspended solids; when the cutting waste fluid filtrate does not contain oil and... When removing suspended solids, open the discharge valve of the small automatic fine filter to allow the filtrate to flow into the filtrate recycling tank. Adjust the permeate valve in the nano-ceramic membrane module to ensure an average permeate flow rate of 40–60 L / h per membrane. When the concentrated wastewater from the cuttings reaches 5–10% of the total feed volume, discharge it into the concentrate collection tank. When the permeate flow rate drops below 40 L / h, stop the machine for cleaning, following the sequence of clean water wash – chemical wash – clean water wash until the permeate flow rate recovers to 40–60 L / h. After clean water wash, the wastewater is directly discharged into the wastewater treatment plant through a pipeline. After chemical wash, the wastewater is returned to the chemical wash tank for recycling. Wastewater is only discharged into the wastewater treatment plant when chemical wash is no longer effective.

[0096] Example 1 uses a processing capacity of 30m³. 3 / d Large-scale fine filter presses filter cutting wash water. Open the discharge valve of the transfer tank and the return valve of the concentrate to the transfer tank, close the valves of the chemical washing tank and the clean water washing tank, connect the compressed air source, set the backwashing time to 30 minutes and 3 seconds, adjust the air compressor pressure to 0.4-0.6 MPa, adjust the circulating pump pressure to 0.4-0.6 MPa, and start the automatic precision machine; take a sample from the filtrate sampling port and observe whether the cutting washing water filtrate is clear; when the filtrate is clear, open the discharge valve of the large automatic fine filter to discharge the filtrate into the filtrate recycling tank, adjust the water production valve in the nano-ceramic membrane module to make the average water production of each membrane between 40-60 L / h; when the concentrated cutting washing water is 1-5% of the total liquid volume, discharge it into the concentrate collection tank; when the water production is lower than 40 L / h, stop the machine for cleaning, cleaning in the order of clean water washing-chemical washing-clean water washing until the water production recovers to 40-60 L / h. After rinsing with clean water, the wastewater is directly discharged into the wastewater station through the pipe. After medicated washing, the wastewater is returned to the medicated washing tank for recycling. When the medicated washing no longer achieves its effect, the wastewater is discharged into the wastewater station.

[0097] Example 4: Evaporation and Concentration

[0098] After the cutting wash water has been recycled 5-10 times, the processing capacity of Example 1 is 30m³. 3 The large-scale fine filter press filters the cutting water, and the filtrate is concentrated by evaporation using a 3t / d evaporation and concentration equipment as described in Example 1. Figure 3 As shown. A negative pressure is created inside the evaporator by a circulating pump and a vacuum pump, automatically sending the cutting wash water from the filtrate reuse tank into the filtrate concentration equipment. Through its own heat exchange and vacuum evaporation, the water in the cutting wash water evaporates rapidly at a low temperature of 30-40℃. The condensate formed by the evaporated water vapor returns to the filtrate reuse tank. The concentrated liquid is discharged into a concentrate collection tank for outsourced disposal.

[0099] Taking a company that generates 1 ton of cutting fluid waste daily as an example, using the cutting fluid waste in-situ reuse device and method described in this invention, each ton of cutting fluid waste produces 0.08 tons of concentrated liquid, resulting in 2.4 tons of concentrated liquid per month. Assuming an outsourcing disposal fee of 750 yuan / ton, the outsourcing disposal fee for the cutting fluid waste treated using the device and method described in this invention would be 1800 yuan / month. Adding the labor, electricity, and other processing costs for using the device, the total cost of treating the cutting fluid waste is 5400 yuan / month. However, if the processing is directly outsourced, the outsourcing disposal fee for the cutting fluid waste would be 22500 yuan / month. Therefore, for a company generating 1 ton of cutting fluid waste daily, a monthly saving of 17100 yuan in outsourcing disposal fees can be achieved.

[0100] Taking the example of a company that generates 30 tons of cutting wastewater daily, using the cutting wastewater in-situ reuse device and method of this invention, each ton of cutting wastewater produces 0.03 tons of concentrated liquid, resulting in 27 tons of concentrated liquid per month. Assuming the cutting wastewater is circulated 10 times, filtered, and then evaporated, an average of 2.9 tons are evaporated per day. Assuming an electricity consumption of 200 kWh / ton for evaporating one ton of wastewater, and an electricity cost of 0.6 yuan / kWh, the evaporation electricity cost is 10,440 yuan / month. Since evaporating one ton of wastewater produces 0.03 tons of concentrated liquid, 2.61 tons of concentrated liquid are produced monthly, resulting in a total of 29.61 tons of concentrated liquid. The outsourced disposal cost of the cutting wastewater treated using the cutting wastewater in-situ reuse device and method of this invention is 1,800 yuan / month, for a total cutting wastewater treatment cost of 58,878 yuan / month. However, if the treatment is directly outsourced, at an outsourced disposal cost of 750 yuan / ton, the outsourced disposal cost of the cutting wastewater would be 675,000 yuan / month. Therefore, taking a daily production of 30 tons of cutting fluid as an example, the monthly outsourcing disposal fee can be reduced by 616,122 yuan.

[0101] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A device for in-situ reuse of cutting waste fluid, characterized in that, It consists of a slag remover, a bag filter, a raw liquid collection tank, a transfer tank, an automatic fine filter, and a filtrate recycling tank connected in sequence by pipelines. The transfer tank is connected to a clean water washing tank and a concentrated liquid collection tank through pipelines. The automatic fine filter consists of a circulating pump, a nano-ceramic membrane module connected in series with membrane tubes, a chemical washing tank connected by the output pipeline of the nano-ceramic membrane module, an air compressor, and an electric backwashing device connected in sequence by pipelines for the compressed gas from the air compressor. The slag removal machine includes a cylinder and a detachable top cover. The detachable top cover has a feed inlet on its top, and the feed inlet is connected to a steel wire hose. The cylinder contains, from top to bottom, a stainless steel filter screen, an impeller, an air inlet, an air outlet, and a discharge outlet. The discharge outlet is located at the bottom of the cylinder. The stainless steel filter screen is placed on the upper layer of the cylinder and has a pore size of 1.8 mm. The top of the stainless steel filter screen has a filter screen lifting handle. The air inlet and air outlet are symmetrically opened on both sides of the impeller and fixed to the lower layer of the cylinder.

2. A method for in-situ recycling of cutting waste fluid based on the in-situ recycling device of claim 1, characterized in that, Includes the following steps: (1) Collect by category: collect cutting waste fluid and cutting washing water separately; (2) Slag removal: Use a slag remover to filter out metal chips, mud and suspended slag with a diameter greater than 1.8 mm from the cutting waste fluid; (3) Coarse filtration: Use a bag filter to filter out suspended solids >178 microns in the cutting waste fluid; then transfer the filtered cutting waste fluid into a transfer tank; (4) Fine filtration: The cutting waste fluid in the transfer tank is filtered using a small automatic fine filter. When the cutting waste fluid flows through the nano-ceramic membrane module, under pressure, the water and small molecule useful components in the waste fluid flow out of the membrane tube along the nanopores perpendicular to the direction of the membrane tube, forming filtrate. The filtrate is discharged into the filtrate recycling tank, while the residual oil, suspended solids, and unfiltered water and small molecule useful components are returned to the transfer tank for continued circulation and filtration. The volume continuously decreases. When the volume is concentrated to the set value of the original volume, a concentrate is formed. The concentrate is discharged from the bottom of the transfer tank to the concentrate collection tank.

3. The method for in-situ reuse of cutting waste fluid according to claim 2, characterized in that, The slag removal process in step (2) further includes: (2.1) Tighten the detachable top cover of the slag remover, connect the air source to the air inlet of the slag remover, and after the equipment is running, the cutting waste liquid to be treated is pumped into the slag remover from the feed inlet of the slag remover for filtration. (2.2) The cutting waste fluid coming out of the slag remover discharge port directly enters the bag filter for filtration, and the filtrate enters the raw liquid collection tank; (2.3) When the cutting waste fluid cannot be pumped out, cut off the air supply, open the top cover of the slag remover, take out the stainless steel filter screen full of metal shavings through the filter screen lifting ring, pour the metal shavings into the recycling bag, reinstall the top cover, and continue filtering after turning on the air supply.

4. The method for in-situ reuse of cutting waste fluid according to claim 2, characterized in that, The fine filtration described in step (4) further includes: (4.1) Open the discharge valve of the transfer tank and the return valve of the concentrated liquid to the transfer tank, close the valves of the washing tank and the clean water washing tank, connect the compressed air source, set the backwashing time to 30 min and backwashing 3 s, adjust the air compressor pressure to make the air compressor pressure of the small automatic fine filter ≥ 0.3 MPa, adjust the circulation pump pressure to make the circulation pump pressure of the small automatic fine filter ≥ 0.3 MPa, and start the small automatic precision machine. (4.2) Take a sample from the filtrate sampling port and observe whether the cutting waste fluid filtrate contains oil and suspended matter; (4.3) When the cutting waste fluid filtrate does not contain oil and suspended matter, open the discharge valve of the small automatic fine filter to discharge the filtrate into the filtrate recycling tank, and adjust the water production valve in the nano-ceramic membrane module so that the average water production of each membrane is between 40 and 60 L / h. (4.4) When the volume of the waste liquid of the cuttings in the transfer tank is 5 to 10% of the total liquid volume, a concentrated liquid is formed and discharged from the bottom of the transfer tank into the concentrated liquid collection tank. (4.5) When the water production of the nano-ceramic membrane module is less than 40L / h, the machine is stopped for cleaning. The cleaning is carried out in the order of water washing-chemical washing-water washing until the water production is restored to 40-60L / h. The wastewater after water washing is directly discharged into the wastewater station, and the wastewater after chemical washing is returned to the chemical washing tank for recycling. When the chemical washing is no longer effective, it is discharged into the wastewater station.

Images