Nickel sulfate material purification device and process

Abstract

The invention discloses a nickel sulfate material purification device and process, and relates to the technical field of environmental protection engineering and chemical engineering, and the nickel sulfate material purification device comprises a homogeneous buffer tank, an ozone oxidation oil removal tower and at least one set of ultra-fine bubble circulating device. The ozonation oil removal tower is connected with the ultra-fine bubble generator through the pipeline, the feed liquid in the ozonation oil removal tower is circularly treated through the external circulating pump, and after bubbles generated by the ultra-fine bubble generator are combined with ozone, the ozone is pumped into the feed liquid to be treated in the form of ultra-fine bubbles. The ozone can be more efficiently subjected to homogeneous reaction with impurities contained in the feed liquid, and organic components in the feed liquid are converted into carbon dioxide and water, so that the TOC content is reduced, the utilization efficiency of the ozone is improved, and the treatment cost is reduced; a novel pressure oil removal device is additionally arranged above the ozone oxidation oil removal tower, upper-layer oil is sucked out of the water surface through pressure, the oil-liquid separation effect is achieved, secondary recycling is carried out, the method is convenient to operate, and only regular pressure reduction treatment needs to be carried out.

Description

Technical Field

[0001] The present invention relates to the fields of environmental protection engineering and chemical technology, and in particular to a purification device and process for nickel sulfate materials. Background Art

[0002] Chinese Patent Application Publication No. CN114349244A discloses an oil-containing wastewater ozone oil removal device, and the principle is as follows: When the oil-containing wastewater ozone oil removal device works, the liquid to be treated flows into the cavitation chamber from the feed pipe and is fully mixed with the ozone gas output from the output end of the ozone generator to achieve a preliminary cavitation effect. The liquid in the cavitation chamber is in a high-pressure state, and the mixed liquid under high pressure will be subjected to high-pressure treatment through the throat chamber to further form cavitation. The flowing high-pressure mixed liquid will drive the impeller and the central rotating shaft to rotate, and the central rotating shaft will drive the lifting plate to move up and down through the transmission mechanism. During the up-and-down reciprocating movement of the lifting plate, the high-pressure mixed liquid in the diffusion chamber continuously impacts the oil absorption layer through the liquid flow channel.

[0003] The disadvantages of the above oil removal and purification device are as follows:

[0004] 1. It is necessary to use an ozone generator in combination with equipment such as a cavitation chamber, a throat chamber, and a diffusion chamber, resulting in too high upfront investment costs;

[0005] 2. There are many equipment used in combination, and equipment maintenance and replacement are troublesome and costly in the later stage;

[0006] 3. A large amount of energy supply is required for ozone generation and equipment to maintain cavitation and throat effects, resulting in high operating costs;

[0007] 4. The contact surface between ozone and the equipment is too much, increasing the anti-corrosion cost and there will still be corrosion phenomena during use, shortening the service life;

[0008] 5. Due to the relatively complex equipment design, for high-salt wastewater and other wastewaters during actual operation, various parameters cannot meet the expected requirements, resulting in a relatively high actual ozone consumption and still there is ozone dissipation phenomenon;

[0009] 6. The purification efficiency is not high, and high-purity nickel sulfate materials cannot be obtained.

[0010] The Chinese patent application with the publication number CN108911003A discloses a micro-nano bubble air flotation oil removal device and process; the principle is as follows: through the structural design of the pool body, combined with the adsorption effect of micro-nano bubbles and setting different bubble diameters according to the physical state of the oil in the water to be deoiled, whether it is a large-particle oil mass, oil sludge, or small-molecule oil droplets, they can be adsorbed and aggregated and quickly rise to the water surface. Coupled with the hierarchical design of each pool, it can guide the water to be treated to efficiently achieve scum treatment and return the scum to the refining tank, so that the oil-polluted water area is completely free of oil pollution. In addition, the water body can be subjected to advanced oxidation through an ozone generator to purify and restore the water quality and increase a certain amount of dissolution, so as to restore the water quality.

[0011] The disadvantages of the above oil removal and purification device are as follows:

[0012] 1. The removal effect on specific oils is poor. For example, in high-salt wastewater, the oil substances have poor fluidity and are not easily adsorbed and carried by nano-bubbles to rise, making it difficult to separate.

[0013] 2. A longer reaction time is required to achieve a better oil removal effect.

[0014] 3. The equipment is complex and the maintenance cost is high.

[0015] 4. The equipment occupies a large area and the operation and maintenance are complex.

[0016] It is easily affected by water quality, has poor stability, and does not have universal applicability. Calcium, magnesium and other ions are likely to form scale inside the equipment, blocking micropores and pipelines, affecting the generation and release of nano-bubbles. Chloride ions and sulfate ions may corrode the equipment and change the generation conditions of nano-bubbles. Summary of the Invention

[0017] In order to solve the above technical problems, the present invention provides a nickel sulfate material purification device and process. The following technical solutions are adopted:

[0018] A nickel sulfate material purification device includes a homogenization buffer tank, an ozone oxidation oil removal tower and at least one set of ultra-fine bubble circulation devices. The nickel sulfate solution pipe to be treated is connected to the feed port of the homogenization buffer tank. The discharge port of the homogenization buffer tank is connected to the feed port of the ozone oxidation oil removal tower. The top of the ozone oxidation oil removal tower is provided with a pressure oil removal device, the middle part is provided with a liquid inlet, the lower part is provided with an ultra-fine bubble circulation outlet and an ultra-fine bubble circulation inlet, and the bottom is provided with a liquid outlet;

[0019] The pressure oil removal device includes a conical structure and a pressure relief oil absorption component. The conical structure collects the upper-layer oil in the ozone oxidation oil removal tower, and the pressure relief oil absorption component sucks out the upper-layer oil to achieve the effect of oil-liquid separation;

[0020] The ultra-fine bubble circulation device includes a circulation pump and an ultra-fine bubble generator. The inlet of the ultra-fine bubble generator is connected to the ultra-fine bubble circulation outlet, and the outlet of the ultra-fine bubble generator is connected to the ultra-fine bubble circulation inlet through the circulation pump and pipelines.

[0021] By adopting the above technical solution, the ozone oxidation degreasing tower and the ultra-fine bubble generator are connected through pipelines. The liquid in the ozone oxidation degreasing tower is circulated by an external circulation pump. External ozone is generated from the ozone generator, flows through the gas flowmeter and then enters the ultra-fine bubble generator. At this time, the high-speed liquid generated by the external circulation pump flows through the ultra-fine bubble generator. Due to the designed sudden contraction and sudden expansion structure inside, a negative pressure is generated, enabling the gas and liquid to be sheared and mixed at high speed inside. The solution is processed and then pumped back into the tank to form a self-circulation. Finally, after the treatment is completed, the qualified solution is discharged from the bottom. Bubbles with a diameter less than 50 microns (even up to the nanometer level) are generated by the ultra-fine bubble generator. After combining with ozone, the ozone is injected into the liquid to be treated in the form of ultra-fine bubbles, which can make ozone react more efficiently with the impurities contained in the liquid, convert the organic components in the liquid into carbon dioxide and water, thereby reducing the TOC content, improving the utilization efficiency of ozone, and reducing the treatment cost.

[0022] By combining ozone with ultra-fine bubbles to treat oil content and TOC, it can be applied to different types of new energy material purification processes.

[0023] Adding an external circulation pump outside the ozone oxidation degreasing tower for the circulation treatment process is simple, which can effectively solve the problems of the original new energy liquid degreasing process, such as complex process, troublesome operation, and too high later maintenance cost.

[0024] The pressure degreasing device can greatly reduce the oil content in the liquid, effectively slow down the rupture of bubbles on the water surface during the floating process, which may cause oil-liquid mixing, and a reflux plate is set above the water inlet, which can reduce the surface liquid level fluctuation and reduce the influence on the suction of the upper oil.

[0025] By combining the pressure degreasing device with ozone ultra-fine bubbles, the oil in the nickel sulfate liquid is effectively separated, and the nickel sulfate liquid is further purified, avoiding the problem of black impurities in the nickel sulfate material caused by incomplete removal of oil at the back end.

[0026] It can effectively reduce the TOC contained in the nickel sulfate liquid, reduce the influence of organic substances in the nickel sulfate liquid on the structure and appearance of the nickel sulfate material, improve the degree of the nickel sulfate material, and can be used to meet the needs of higher-end applications and improve the overall performance of the product.

[0027] Optionally, the ozone oxidation and oil removal tower includes a tower body, an ozone generator, a conical structure, and a pressure relief and oil suction assembly. The ozone outlet of the ozone generator is communicated with the air inlet of the ultra-fine bubble circulation device. The conical structure is installed at the top inside the tower body, and the pressure relief and oil suction assembly is installed at the top of the tower body.

[0028] By adopting the above technical solution, the ozone generator generates a set amount of ozone according to the amount of the nickel sulfate solution to be purified entering the tower body, realizing the preliminary mixing of ozone and the nickel sulfate solution to be purified.

[0029] Optionally, the conical structure includes a lower oil collecting cone, an upper oil collecting cone, and an oil collecting pipe. The lower oil collecting cone includes a lower conical cover and a lower cylindrical pipe. The lower conical cover is installed at the upper part inside the tower body, and the bottom of the lower cylindrical pipe is installed at the top opening of the lower conical cover. The upper oil collecting cone includes an upper cylindrical pipe and an upper conical cover. The upper cylindrical pipe is installed at the bottom opening of the upper conical cover. The upper oil collecting cone covers above the lower conical cover and is connected to the inner wall of the tower body through a rib plate on the side. One end of the oil collecting pipe is communicated with the oil pumping port at the top of the upper conical cover, and the pressure relief and oil suction assembly is communicated with the other end of the oil collecting pipe.

[0030] Optionally, the pressure relief and oil suction assembly includes an oil discharge valve, an exhaust needle valve, and an oil collecting tank. The oil discharge valve is installed in the middle of the oil collecting pipe. One end of the exhaust needle valve is communicated with the exhaust port at the top of the tower body through a pipeline, and the other end is communicated with the oil collecting pipe. The communication position is on the outlet side of the oil discharge valve. The inlet of the oil collecting tank is communicated with the end of the oil collecting pipe through a pipeline.

[0031] Optionally, the pressure relief and oil suction assembly further includes a gas phase balance valve. One end of the gas phase balance valve is communicated with the air pressure balance port at the top of the tower body through a pipeline, and the other end is communicated with the oil collecting pipe. The communication position is on the inlet side of the oil discharge valve.

[0032] By adopting the above technical solution, most of the oil in the nickel sulfate feed liquid is separated out and floats to the liquid surface by ultra-fine bubbles and ozone, and converges on the upper layer and overflows into the upper oil collecting cone through the lower cylindrical pipe, and then the upper oil discharge valve and the exhaust needle valve are opened for pressure reduction. The upper layer of oil is sucked out of the water surface by using the pressure, achieving the oil-liquid separation effect and being recycled twice. This method is convenient to operate and only needs to be decompressed regularly.

[0033] Optionally, the number of the ultra-fine bubble circulation devices is two. An ultra-fine bubble circulation outlet and an ultra-fine bubble circulation inlet are respectively arranged on both sides of the lower part of the ozone oxidation and oil removal tower. The inlets of the two ultra-fine bubble circulation devices are respectively communicated with the ultra-fine bubble circulation outlets on both sides of the ozone oxidation and oil removal tower. The outlet of the ultra-fine bubble generator is communicated with the ultra-fine bubble circulation inlets on both sides of the ozone oxidation and oil removal tower through a circulation pump and a pipeline.

[0034] By adopting the above technical solution, two sets of ultra-fine bubble circulation devices can form a more uniform circulation on both sides of the ozone oxidation degreasing tower, increasing the purification efficiency.

[0035] Optionally, the ultra-fine bubble generator is made of ozone-resistant metal materials.

[0036] By adopting the above technical solution, the material of the ultra-fine bubble generator is made of ozone-resistant metal materials, such as Inconel alloy, 316 stainless steel, titanium materials, etc., preferably made of titanium materials, which has extremely high tolerance to ozone and further reduces the corrosion risk brought by ozone. At the same time, using titanium materials can withstand most of the high-difficulty wastewater of new energy. In addition, when the ultra-fine bubble generator is designed, the internal design is a through-hole structure, and it will not occur that the formation of scale due to calcium and magnesium ions blocks the micropores and affects the generation of ultra-fine bubbles.

[0037] Optionally, it further includes a heat exchanger, and the nickel sulfate solution to be purified output from the homogeneous buffer tank enters the ozone oxidation degreasing tower after heat exchange through the heat exchanger.

[0038] By adopting the above technical solution, when the nickel sulfate solution to be purified carries heat, it enters the degreasing tower for treatment after the solution temperature is reduced through the heat exchanger, avoiding the influence of high-temperature solution on purification.

[0039] A nickel sulfate material purification process uses a nickel sulfate material purification device to treat the nickel sulfate solution to be purified, including the following steps:

[0040] Step 1, the nickel sulfate solution to be purified enters the homogeneous buffer tank, and after homogenization, it flows into the heat exchanger for heat exchange, and then enters the ozone oxidation degreasing tower after heat exchange;

[0041] Step 2, the ozone generator of the ozone oxidation degreasing tower is started, and ozone is injected into the ultra-fine bubble generator;

[0042] Step 3, the circulation pump is turned on, and the nickel sulfate solution in the ozone oxidation degreasing tower enters the ultra-fine bubble generator;

[0043] Step 4, the ultra-fine bubble generator shears and mixes ozone and the nickel sulfate solution at high speed, and then the circulation pump pumps the nickel sulfate solution into the ozone oxidation degreasing tower in a cycle;

[0044] Step 5, the pressure relief and oil absorption assembly collects the upper oil fraction in the ozone oxidation degreasing tower;

[0045] Step 6, after the ozone oxidation degreasing tower and the ultra-fine bubble circulation device work for a set time, the purified nickel sulfate solution is discharged from the bottom liquid outlet of the ozone oxidation degreasing tower.

[0046] The reaction time in Step 6 is 2 - 5 hours.

[0047] In summary, the present invention includes at least one of the following beneficial technical effects:

[0048] The present invention can provide a purification device and process for nickel sulfate materials. The ozone oxidation degreasing tower is connected to the ultra-fine bubble generator through a pipeline. The liquid in the ozone oxidation degreasing tower is circulated by an external circulation pump. External ozone is generated from the ozone generator, flows through the gas flow meter, and then enters the ultra-fine bubble generator. At this time, the high-speed liquid generated by the external circulation pump flows through the ultra-fine bubble generator, and due to the sudden contraction and expansion structure inside, negative pressure is generated, enabling the gas and liquid to be sheared and mixed at high speed inside. The solution is pumped back into the tank body to form a self-circulation, and finally, the qualified solution is discharged from the bottom after treatment. The bubbles generated by the ultra-fine bubble generator combine with ozone and then inject the ozone into the liquid to be treated in the form of ultra-fine bubbles, which can make ozone react more efficiently with the impurities contained in the liquid, convert the organic components in the liquid into carbon dioxide and water, thereby reducing the TOC content, improving the utilization efficiency of ozone, and reducing the treatment cost.

[0049] A new type of pressure degreasing device is added above the ozone oxidation degreasing tower. Through ultra-fine bubbles plus ozone, most of the oil in the nickel sulfate liquid is floated to the liquid surface and converges on the upper layer. Then, the upper pressure relief valve is opened to reduce the pressure, and the upper oil is sucked out of the water surface by using the pressure to achieve the effect of oil-liquid separation and secondary reuse. This method is convenient to operate and only requires regular pressure reduction treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of the connection principle structure of the components of a purification device for nickel sulfate materials according to the present invention;

[0051] Figure 2 is a schematic diagram of the connection principle structure of the components of the ozone oxidation degreasing tower and the ultra-fine bubble circulation device of a purification device for nickel sulfate materials according to the present invention;

[0052] Description of the reference numerals: 1, homogeneous buffer tank; 2, heat exchanger; 3, ozone oxidation degreasing tower; 31, tower body; 41, circulation pump; 42, ultra-fine bubble generator; 31, tower body; 32, lower oil collection cone; 321, lower conical cover; 322, lower cylindrical pipe; 33, upper oil collection cone; 331, upper cylindrical pipe; 332, upper conical cover; 34, oil collection pipe; 35, oil discharge valve; 36, exhaust needle valve; 37, gas phase balance valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] The following further describes the present invention in detail with reference to the drawings.

[0054] An embodiment of the present invention discloses a purification device and process for nickel sulfate materials.

[0055] Refer toFigure 1 and Figure 2 Example 1. A purification device for nickel sulfate material, comprising a homogeneous buffer tank 1, an ozone oxidation degreasing tower 3 and at least one set of ultra-fine bubble circulation device. The nickel sulfate solution pipe to be treated is communicated with the feed inlet of the homogeneous buffer tank 1. The discharge outlet of the homogeneous buffer tank 1 is communicated with the feed inlet of the ozone oxidation degreasing tower 3. The top of the ozone oxidation degreasing tower 3 is provided with a pressure degreasing device, the middle part is provided with a liquid inlet, the lower part is provided with an ultra-fine bubble circulation outlet and an ultra-fine bubble circulation inlet, and the bottom is provided with a liquid outlet;

[0056] The pressure degreasing device comprises a conical structure and a pressure relief oil suction component. The conical structure collects the upper layer of oil in the ozone oxidation degreasing tower 3, and the pressure relief oil suction component sucks out the upper layer of oil to achieve the effect of oil-liquid separation;

[0057] The ultra-fine bubble circulation device comprises a circulation pump 41 and an ultra-fine bubble generator 42. The inlet of the ultra-fine bubble generator 42 is communicated with the ultra-fine bubble circulation outlet, and the outlet of the ultra-fine bubble generator 42 is communicated with the ultra-fine bubble circulation inlet through the circulation pump 41 and a pipeline.

[0058] The ozone oxidation degreasing tower 3 is connected with the ultra-fine bubble generator 42 through a pipeline. The liquid in the ozone oxidation degreasing tower 3 is circulated by using an external circulation pump 41. External ozone is generated from an ozone generator, flows through a gas flowmeter and then enters the ultra-fine bubble generator 42. At this time, the high-speed liquid generated by the external circulation pump 41 flows through the ultra-fine bubble generator 42, and due to the designed sudden contraction and sudden expansion structure inside, a negative pressure is generated, so that the gas and the liquid are subjected to high-speed shear mixing inside. The solution is pumped back into the tank body to form a self-circulation. Finally, after the treatment is completed, the qualified solution is discharged from the lower part. Bubbles with a diameter less than 50 microns (even up to the nanometer level) are generated through the ultra-fine bubble generator, and after being combined with ozone, the ozone is injected into the liquid to be treated in the form of ultra-fine bubbles, which can make ozone more efficiently carry out homogeneous reaction with the impurities contained in the liquid, convert the organic components in the liquid into carbon dioxide and water, thereby reducing the TOC content, improving the utilization efficiency of ozone, and reducing the treatment cost;

[0059] By combining ozone with ultra-fine bubbles to treat oil and TOC, it can be applied to different types of new energy material purification processes;

[0060] Adding an external circulation pump 41 outside the ozone oxidation degreasing tower for the circulation treatment process is simple, and can effectively solve the problems of the original new energy liquid degreasing process, such as complex process, troublesome operation, and too high later maintenance cost;

[0061] The pressure oil removal device can significantly reduce the oil content in the liquid material, effectively slow down the rupture of bubbles on the water surface during the upward floating process, which may cause the mixing of oil and liquid. Moreover, a reflux plate is provided above the water inlet to reduce the surface liquid level fluctuation and mitigate the influence on the suction of the upper oil fraction.

[0062] By combining the pressure oil removal device with ozone ultra-fine bubbles, the oil and liquid in the nickel sulfate liquid material can be effectively separated, and the nickel sulfate liquid material can be further purified to avoid the problem of black impurities appearing in the nickel sulfate material caused by incomplete removal of the oil fraction at the back end.

[0063] It can effectively reduce the TOC contained in the nickel sulfate liquid material, reduce the influence of organic substances in the nickel sulfate liquid material on the structure and appearance of the nickel sulfate material, improve the degree of the nickel sulfate material, and can be used to meet the needs of higher-end applications and improve the overall performance of the product.

[0064] Example 2: The ozone oxidation oil removal tower 3 includes a tower body 31, an ozone generator, a conical structure, and a pressure relief and oil suction assembly. The ozone outlet of the ozone generator is communicated with the air inlet of the ultra-fine bubble circulation device. The conical structure is installed at the top inside the tower body 31, and the pressure relief and oil suction assembly is installed at the top of the tower body 31.

[0065] The ozone generator generates a set amount of ozone according to the amount of the nickel sulfate solution to be purified entering the tower body 31 to achieve the preliminary mixing of ozone and the nickel sulfate solution to be purified.

[0066] Example 3: The conical structure includes a lower oil collecting cone 32, an upper oil collecting cone 33, and an oil collecting pipe 34. The lower oil collecting cone 32 includes a lower conical cover 321 and a lower cylindrical pipe 322. The lower conical cover 321 is installed in the upper part inside the tower body 31, and the bottom of the lower cylindrical pipe 322 is installed at the top opening of the lower conical cover 321. The upper oil collecting cone 33 includes an upper cylindrical pipe 331 and an upper conical cover 332. The upper cylindrical pipe 331 is installed at the bottom opening of the upper conical cover 332. The upper oil collecting cone 33 covers the upper part of the lower conical cover 321 and is connected to the inner wall of the tower body 31 through a rib plate on the side. One end of the oil collecting pipe 34 is communicated with the oil pumping port at the top of the upper conical cover 332, and the pressure relief and oil suction assembly is communicated with the other end of the oil collecting pipe 34.

[0067] Example 4: The pressure relief and oil suction assembly includes an oil discharge valve 35, an exhaust needle valve 36, and an oil collecting tank. The oil discharge valve 35 is installed in the middle of the oil collecting pipe 34. One end of the exhaust needle valve 36 is communicated with the exhaust port at the top of the tower body 31 through a pipeline, and the other end is communicated with the oil collecting pipe 34. The communication position is on the outlet side of the oil discharge valve 35. The inlet of the oil collecting tank is communicated with the end of the oil collecting pipe 34 through a pipeline.

[0068] Example 5. The pressure relief and oil suction assembly further includes a gas phase balance valve 37. One end of the gas phase balance valve 37 is connected to the air pressure balance port at the top of the tower body 31 through a pipeline, and the other end is connected to the oil collecting pipe 34. The connection position is on the inlet side of the oil discharge valve 35.

[0069] Ultra-fine bubbles plus ozone separate most of the oil in the nickel sulfate solution and float it to the liquid surface. The oil converges on the upper layer and overflows into the upper oil collecting cone 33 through the lower cylindrical pipe 322. Then, the upper oil discharge valve 35 and the exhaust needle valve 36 are opened for pressure relief. The upper layer of oil is sucked out of the water surface by using pressure to achieve the oil-liquid separation effect and is recycled for the second time. This method is convenient to operate and only requires regular pressure relief treatment.

[0070] Example 6. The number of ultra-fine bubble circulation devices is two sets. An ultra-fine bubble circulation outlet and an ultra-fine bubble circulation inlet are respectively provided on both sides of the lower part of the ozone oxidation and oil removal tower 3. The inlets of the two sets of ultra-fine bubble circulation devices are respectively connected to the ultra-fine bubble circulation outlets on both sides of the ozone oxidation and oil removal tower 3. The outlet of the ultra-fine bubble generator 42 is connected to the ultra-fine bubble circulation inlets on both sides of the ozone oxidation and oil removal tower 3 through a circulation pump 41 and a pipeline.

[0071] The two sets of ultra-fine bubble circulation devices can form a more uniform circulation on both sides of the ozone oxidation and oil removal tower 3, increasing the purification efficiency.

[0072] Example 7. The ultra-fine bubble generator 42 is made of ozone-resistant metal materials.

[0073] The ultra-fine bubble generator 42 is made of ozone-resistant metal materials, such as Inconel alloy, 316 stainless steel, titanium materials, etc. Titanium materials are preferably used, which have extremely high tolerance to ozone and further reduce the corrosion risk brought by ozone. At the same time, using titanium materials can withstand most of the high-difficulty wastewater of new energy. In addition, when the ultra-fine bubble generator is designed, the internal design is a through-hole structure, and it will not occur that the formation of scale due to calcium and magnesium ions blocks the micropores and affects the generation of ultra-fine bubbles.

[0074] Example 8. It further includes a heat exchanger 2. The nickel sulfate solution to be purified output from the homogeneous buffer tank 1 enters the ozone oxidation and oil removal tower 3 after heat exchange through the heat exchanger 2.

[0075] When the nickel sulfate solution to be purified carries heat, it enters the oil removal tower for treatment after the solution temperature is reduced by the heat exchanger 2 to avoid the influence of high-temperature solution on purification.

[0076] Example 9. A nickel sulfate material purification process uses a nickel sulfate material purification device to treat the nickel sulfate solution to be purified, including the following steps:

[0077] Step 1, the nickel sulfate solution to be purified enters the homogenization buffer tank 1, and after homogenization, it flows into the heat exchanger 2 for heat exchange, and then enters the ozone oxidation degreasing tower 3 after heat exchange;

[0078] Step 2, the ozone generator in the ozone oxidation degreasing tower 3 is started, and ozone is injected into the ultrafine bubble generator 42;

[0079] Step 3, the circulation pump 41 is turned on, and the nickel sulfate solution in the ozone oxidation degreasing tower 3 enters the ultrafine bubble generator 42;

[0080] Step 4, the ultrafine bubble generator 42 shears and mixes ozone and the nickel sulfate solution at high speed, and then the circulation pump 41 pumps the nickel sulfate solution into the ozone oxidation degreasing tower 3 in a cycle;

[0081] Step 5, the pressure relief and oil absorption assembly collects the upper layer of oil in the ozone oxidation degreasing tower 3;

[0082] Step 6, after the ozone oxidation degreasing tower 3 and the ultrafine bubble circulation device work for a set time, the purified nickel sulfate solution is discharged from the bottom liquid outlet of the ozone oxidation degreasing tower 3.

[0083] Example 10, the reaction time in Step 6 is 2 - 5 hours.

[0084] The following uses experiments to illustrate the implementation principle of a nickel sulfate material purification device and process of the present invention:

[0085] The nickel sulfate feed liquid is introduced into the reaction barrel (the water volume is 800 L), and the initial TOC of this wastewater is 150 ppm;

[0086] Inside the ton barrel, an ultrafine bubble generation system is used, and ozone is used as the gas source to treat the wastewater. The ozone amount is 30 - 50 g / h, the treatment time is 2 - 5 hours, and samples are taken every 1 hour to observe and detect the sample properties and record the data;

[0087] This ultrafine bubble generation system consists of an ultrafine bubble generator and a submersible pump. The water circulation volume is 1.8 m3 / h, and the air intake volume is 1 m3 / h;

[0088] Experimental data:

[0089] Using ultrafine bubbles + ozone to treat the nickel sulfate feed liquid, in the first experiment, the COD decreased from 490 mg / L to 160 mg / L, the removal rate was 67%, and the O / C was 6.68; the TOC decreased from 164 mg / L to 84 mg / L, the removal rate was 49%, and the total oil decreased from 24 mg / L to 1.2 mg / L. In the second experiment, the COD decreased from 445 mg / L to 132 mg / L, the removal rate was 70%, and the O / C was 5.17; the TOC decreased from 178 mg / L to 89 mg / L, the removal rate was 50%, and the total oil decreased from 27 mg / L to 2.8 mg / L.

[0090] During the experiment, there was no obvious change in the color of the wastewater, and the ozone emissions were relatively large in both experiments. By comparing the two experiments, it was found that after reducing the ozone dosage, the wastewater TOC could still be reduced below 90 within the same time. It was considered that the excessive ozone dosage led to a high O / C ratio.

[0091] In summary, using ozone ultra-fine bubbles to treat nickel sulfate feed liquid has a good effect. The ultra-fine bubble technology can effectively reduce the wastewater TOC and make the effluent meet the target requirements. In the first experiment, the TOC decreased from 164 mg / L to 84 mg / L, and in the second experiment, the TOC decreased from 178 mg / L to 89 mg / L. The TOC in both experiments reached the expected experimental effect of TOC < 90 mg / L.

[0092] Pilot experiment method of the project:

[0093] Introduce the nickel sulfate feed liquid into the nickel sulfate material purification device (water volume 25 m3). The initial oil content of this wastewater is about 0.01 g / L, and the influent flow rate is controlled at 5 m3 / h.

[0094] Use an ultra-fine bubble generation system for external circulation outside the tower, use ozone as the gas source to treat the wastewater, the ozone amount is 5.25 g / h, the treatment time is 20 - 24 hours, and samples are taken every 4 hours (sampling at the inlet and outlet respectively), observe and detect the sample properties and record the data.

[0095] This ultra-fine bubble generation system consists of an ultra-fine bubble generator and a submersible pump. The water circulation volume is 140 m3 / h, and the air intake volume is 50 m3 / h.

[0096] The experimental data is shown in Table 1:

[0097] Table 1

[0098]

[0099] Judging from the experimental results, compared with the traditional ozone oil removal method, the ozone dosage is significantly reduced and the treatment target of oil content less than 0.004 g / L can be stably achieved. When installing on-site, the ultra-fine bubble generator is installed in the existing pipeline, without the need for additional land occupation and additional operating costs.

[0100] The above are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A purification device for nickel sulfate material, characterized in that: It includes a homogeneous buffer tank (1), an ozone oxidation degreasing tower (3) and at least one set of ultra-fine bubble circulation device. The nickel sulfate solution pipe to be treated is connected to the feed port of the homogeneous buffer tank (1). The discharge port of the homogeneous buffer tank (1) is connected to the feed port of the ozone oxidation degreasing tower (3). A pressure degreasing device is provided at the top of the ozone oxidation degreasing tower (3), a liquid inlet is provided in the middle, an ultra-fine bubble circulation outlet and an ultra-fine bubble circulation inlet are provided at the lower part, and a liquid outlet is provided at the bottom. The pressure degreasing device includes a conical structure and a pressure relief oil suction component. The conical structure collects the upper oil fraction in the ozone oxidation degreasing tower (3), and the pressure relief oil suction component sucks out the upper oil fraction to achieve the effect of oil-liquid separation. The ultra-fine bubble circulation device includes a circulation pump (41) and an ultra-fine bubble generator (42). The inlet of the ultra-fine bubble generator (42) is connected to the ultra-fine bubble circulation outlet, and the outlet of the ultra-fine bubble generator (42) is connected to the ultra-fine bubble circulation inlet through the circulation pump (41) and a pipeline.

2. The purification device for nickel sulfate material according to claim 1, characterized in that: The ozone oxidation degreasing tower (3) includes a tower body (31), an ozone generator, a conical structure and a pressure relief oil suction component. The ozone outlet of the ozone generator is connected to the air inlet of the ultra-fine bubble circulation device. The conical structure is installed at the top inside the tower body (31), and the pressure relief oil suction component is installed at the top of the tower body (31).

3. The purification device for nickel sulfate material according to claim 2, characterized in that: The conical structure includes a lower oil collecting cone (32), an upper oil collecting cone (33) and an oil collecting pipe (34). The lower oil collecting cone (32) includes a lower conical cover (321) and a lower cylindrical pipe (322). The lower conical cover (321) is installed at the upper part inside the tower body (31). The bottom of the lower cylindrical pipe (322) is installed at the top opening of the lower conical cover (321). The upper oil collecting cone (33) includes an upper cylindrical pipe (331) and an upper conical cover (332). The upper cylindrical pipe (3 4. The purification device for nickel sulfate material according to claim 3, characterized in that: ​ 5. The purification device for nickel sulfate material according to claim 4, characterized in that: ​ 6. The purification device for nickel sulfate material according to claim 1, characterized in that: The number of the ultra-fine bubble circulation devices is two. Ultra-fine bubble circulation outlets and ultra-fine bubble circulation inlets are respectively arranged on both sides of the lower part of the ozone oxidation and oil removal tower (3). The inlets of the two ultra-fine bubble circulation devices are respectively communicated with the ultra-fine bubble circulation outlets on both sides of the ozone oxidation and oil removal tower (3). The outlet of the ultra-fine bubble generator (42) is communicated with the ultra-fine bubble circulation inlets on both sides of the ozone oxidation and oil removal tower (3) through a circulation pump (41) and a pipeline.

7. The purification device for nickel sulfate material according to claim 6, characterized in that: The ultra-fine bubble generator (42) is made of ozone-resistant metal materials.

8. A purification device for nickel sulfate materials according to claim 1, characterized in that: It further includes a heat exchanger (2). The nickel sulfate solution to be purified output from the homogeneous buffer tank (1) enters the ozone oxidation and oil removal tower (3) after heat exchange through the heat exchanger (2).

9. A purification process for nickel sulfate materials, characterized in that, Using the nickel sulfate material purification device according to any one of claims 1-8 to purify the nickel sulfate solution to be purified, including the following steps: Step 1, the nickel sulfate solution to be purified enters the homogeneous buffer tank (1), and after homogenization, it flows into the heat exchanger (2) for heat exchange, and then enters the ozone oxidation and oil removal tower (3) after heat exchange; Step 2, the ozone generator of the ozone oxidation and oil removal tower (3) is started, and ozone is injected into the ultra-fine bubble generator (42); Step 3, the circulation pump (41) is turned on, and the nickel sulfate solution in the ozone oxidation and oil removal tower (3) enters the ultra-fine bubble generator (42); Step 4, the ultra-fine bubble generator (42) shears and mixes ozone and the nickel sulfate solution at high speed, and then the circulation pump (41) pumps the nickel sulfate solution into the ozone oxidation and oil removal tower (3) in a cycle; Step 5, the pressure relief and oil absorption assembly collects the upper oil fraction in the ozone oxidation and oil removal tower (3); Step 6, after the ozone oxidation and oil removal tower (3) and the ultra-fine bubble circulation device work for a set time, the purified nickel sulfate solution is discharged from the bottom liquid outlet of the ozone oxidation and oil removal tower (3).

10. A purification process for nickel sulfate material according to claim 9, characterized in that: The reaction time in Step 6 is 2-5 hours.

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