Integrated pretreatment device and method for smelting raffinate

Abstract

The invention provides an integrated pretreatment device and method for smelting raffinate, and belongs to the technical field of wastewater treatment.The device is characterized in that a cobalt raffinate oil removal chamber and a nickel raffinate oil removal chamber are arranged at the top of the device side by side and are of the same structure; the first mixing chamber is arranged below the cobalt raffinate oil removal chamber and the nickel raffinate oil removal chamber, the vulcanizing chamber is arranged below the first mixing chamber, the first precipitation separation chamber is arranged on one side of the vulcanizing chamber, the adsorption chamber is arranged above the first precipitation separation chamber, and the second mixing chamber is arranged on one side of the adsorption chamber; the second precipitation separation chamber is arranged below the second mixing chamber, the alkalization chamber is arranged on one side of the second precipitation separation chamber, the third precipitation separation chamber is arranged on one side of the alkalization chamber, the cooling chamber is arranged on one side of the third precipitation separation chamber, and the fourth precipitation separation chamber is arranged on one side of the cooling chamber. The device is simple in structure, low in manufacturing cost, convenient to operate, low in operation cost, low in carbon and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly to an integrated pretreatment device and method for smelting raffinate liquid. Background Art

[0002] In recent years, the technologies for treating and recycling cobalt-nickel smelting wastewater have developed rapidly, forming multiple process routes centered on chemical precipitation, solvent extraction, ion exchange, membrane separation, and evaporation crystallization. These technologies aim to solve the problem of heavy metal pollution while recovering valuable resources such as ammonium sulfate, cobalt-nickel salts, etc., and promoting the industry's transformation towards green circular economy.

[0003] The raffinate liquid is an oily waste liquid generated during the saponification process of cobalt-nickel smelting, which contains different components. The impurity ions are mainly Na + , NH4 + , SO4 2- , Mg 2+ . For such oily wastewater, the usual treatment method is to add liquid alkali for flocculation precipitation to recover valuable metals and then conduct centralized harmless treatment. The Chinese patent "A Device for Treating Heavy Metal Wastewater in Nickel-Cobalt Smelting" (Application No.: 202320370977.7) discloses a wastewater treatment device. This device connects the heavy metal reaction tank and the precipitation tank through a siphon pipe, and the heavy metal reaction tank is connected to the reagent addition tank. The reagent discharge pipe arranged at the bottom of the reagent addition tank extends into the heavy metal reaction tank to achieve the treatment of wastewater. However, this invention patent has the defects of large device volume and high treatment cost. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated pretreatment device and method for smelting raffinate liquid, which reduces environmental pollution, alleviates the pressure of subsequent in-depth wastewater treatment, has a simple structure, low manufacturing cost, convenient operation, low operating cost, and is low-carbon and environmentally friendly.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] In the first aspect, an integrated pretreatment device for smelting raffinate liquid, characterized in that: it includes an oil removal chamber for cobalt raffinate liquid, an oil removal chamber for nickel raffinate liquid, a first mixing chamber, a sulfidation chamber, a first precipitation and separation chamber, an adsorption chamber, a second mixing chamber, a second precipitation and separation chamber, an alkalization chamber, a third precipitation and separation chamber, a cooling chamber, and a fourth precipitation and separation chamber.

[0007] The oil removal chamber for cobalt raffinate and the oil removal chamber for nickel raffinate are arranged side by side at the top of the device. The oil removal chamber for cobalt raffinate and the oil removal chamber for nickel raffinate have the same structure. The first mixing chamber is arranged below the oil removal chamber for cobalt raffinate and the oil removal chamber for nickel raffinate. The sulfidation chamber is arranged below the first mixing chamber. The first precipitation separation chamber is arranged on one side of the sulfidation chamber. The adsorption chamber is arranged above the first precipitation separation chamber. The second mixing chamber is arranged on one side of the adsorption chamber. The second precipitation separation chamber is arranged below the second mixing chamber. The alkalization chamber is arranged on one side of the second precipitation separation chamber. The third precipitation separation chamber is arranged on one side of the alkalization chamber. The cooling chamber is arranged on one side of the third precipitation separation chamber. The fourth precipitation separation chamber is arranged on one side of the cooling chamber.

[0008] Further, the oil removal chamber for cobalt raffinate includes an oil removal barrel, an oil outlet, an oil filter wall, and a liquid outlet.

[0009] The oil removal barrel fills the inside of the oil removal chamber for cobalt raffinate. The oil outlet is arranged at the side bottom of the oil removal barrel. The oil filter wall is arranged on the left inside of the oil removal chamber for cobalt raffinate. A super-hydrophilic and super-oleophobic membrane is attached to the inner wall of the oil filter wall. There are holes on the oil filter wall. A liquid outlet is arranged between the outer side of the oil filter wall and the outer wall of the device.

[0010] Further, a first mixing chamber chemical addition pipe, a first mixing chamber stirrer, a chemical addition meter, and a pH probe are arranged inside the first mixing chamber. The first mixing chamber adjusts the pH value of the wastewater to be greater than 5.0.

[0011] A sulfidation chamber stirrer is arranged inside the sulfidation chamber.

[0012] Further, a flow guide plate is arranged between the first precipitation separation chamber and the sulfidation chamber. The bottom of the first precipitation separation chamber is of a conical structure, and a first precipitation separation chamber discharge valve is arranged at the bottom of the conical structure.

[0013] D851 resin is placed inside the adsorption chamber.

[0014] Further, a second mixing chamber chemical addition pipe, a second mixing chamber stirrer, a chemical addition meter, and a pH probe are arranged inside the second mixing chamber. The second mixing chamber adjusts the pH value of the wastewater to be 8.5 - 9.5.

[0015] The bottom of the second precipitation separation chamber is of a conical structure, and a second precipitation separation chamber discharge valve is arranged at the bottom of the conical structure.

[0016] Further, an alkalization chamber chemical addition pipe, an alkalization chamber stirrer, a gas-liquid separator, and a pH probe are arranged inside the alkalization chamber. An exhaust port is arranged on the top wall of the alkalization chamber.

[0017] Further, the third precipitation separation chamber includes a third precipitation separation chamber discharge valve and a third precipitation separation chamber water outlet.

[0018] The third precipitation separation chamber discharge valve is arranged at the bottom of the third precipitation separation chamber, and the third precipitation separation chamber water outlet is arranged inside the third precipitation separation chamber.

[0019] Further, the cooling chamber includes a cooling pipe, a coolant addition port, and a coolant discharge valve.

[0020] The cooling pipe is arranged inside the cooling chamber. The cooling pipe is a spiral downward cooling pipe. The cooling pipe is communicated with the third precipitation separation chamber water outlet. The inside of the cooling chamber is filled with coolant. A coolant addition port is arranged on the top wall of the cooling chamber. The bottom of the cooling chamber is of a conical structure, and a coolant discharge valve is arranged at the bottom of the conical structure.

[0021] Further, the fourth precipitation separation chamber includes a fourth precipitation separation chamber discharge valve and a fourth precipitation separation chamber discharge pipe.

[0022] The bottom of the fourth precipitation separation chamber is of a conical structure, and a fourth precipitation separation chamber discharge valve is arranged at the bottom of the conical structure. A fourth precipitation separation chamber discharge pipe is arranged inside the fourth precipitation separation chamber.

[0023] In a second aspect, a method for treating raffinate using an integrated pretreatment device for smelting raffinate is characterized in that the steps are as follows:

[0024] S1. After the nickel and cobalt raffinates respectively pass through a super-hydrophilic and super-oleophobic membrane filtration in the cobalt raffinate degreasing chamber and the nickel raffinate degreasing chamber, the oil is left in the degreasing barrel and discharged from the oil outlet, and the filtrate flows from the liquid outlet to the first mixing chamber. In the first mixing chamber, the chemical dosing meter of the first mixing chamber dosing pipe is mixed according to the ammonium-magnesium molar ratio of 1:1, sulfide is added, and the first mixing chamber stirrer stirs to adjust the pH to be greater than 5.0.

[0025] S2. The mixed liquid enters the sulfidation chamber to undergo a sulfidation reaction. Nickel ions Ni 2+ and cobalt ions Co 2+ in the mixed liquid react with sulfide ions S 2- to produce NiS precipitate and CoS precipitate. After being stirred by the sulfidation chamber stirrer, the mixture enters the first precipitation separation chamber to form a heavy slag removal, and then passes through the adsorption chamber. The DB851 resin adsorption can basically completely separate nickel and cobalt in the raffinate.

[0026] After the raffinate is deweighted, it enters the second mixing chamber. An organic solvent and a phosphorus-containing solution are added through the dosing pipe in the second mixing chamber, and the pH is adjusted to 8.5 - 9.5. After being mixed and stirred by the stirrer in the second mixing chamber, it enters the second precipitation and separation chamber. The magnesium ions in the raffinate react and precipitate to obtain magnesium ammonium phosphate, which is discharged through the discharge valve of the second precipitation and separation chamber.

[0027] S4. After the magnesium in the raffinate is precipitated, it enters the alkalization chamber. Lime milk is added through the dosing pipe in the alkalization chamber, and the pH is adjusted to 10.5 - 11.0. The stirrer in the alkalization chamber stirs and alkalizes to form a slurry and generate ammonia gas. After passing through the gas-liquid separator, the separated ammonia gas is discharged from the exhaust port and recycled.

[0028] S5. The slurry passes through the gas-liquid separator and enters the third precipitation and separation chamber, where gypsum is formed and discharged from the discharge valve of the third precipitation and separation chamber for recycling.

[0029] S6. The precipitated slurry enters the cooling chamber through the water outlet of the third precipitation and separation chamber, cools down and crystallizes. In the fourth precipitation and separation chamber, sodium sulfate crystals are precipitated and discharged through the discharge valve of the fourth precipitation and separation chamber for recycling.

[0030] S7. The liquid separated in the fourth precipitation and separation chamber is discharged through the discharge pipe of the fourth precipitation and separation chamber for advanced treatment.

[0031] Advantages of the present invention:

[0032] 1. The present invention conducts oil removal, precipitation and separation treatment on the raffinate, precipitates nickel and cobalt heavy metals in the raffinate, reduces its environmental pollution, and relieves the pressure of subsequent advanced treatment of wastewater.

[0033] 2. The magnesium and ammonium elements in the raffinate are recovered, turning waste into treasure.

[0034] 3. By using side reactions, by-products such as gypsum are produced, increasing economic benefits.

[0035] 4. The present invention has a simple structure, low manufacturing cost, convenient operation, low operating cost, and is low-carbon and environmentally friendly. Description of the Drawings

[0036] Figure 1 It is a schematic diagram of the internal structure of the device of the present invention;

[0037] Figure 2 It is a side view of the device of the present invention;

[0038] In the figure: 1. Oil removal chamber for cobalt raffinate, 1-1. Oil removal barrel, 1-2. Oil outlet, 1-3. Oil filter wall, 1-4. Liquid outlet;

[0039] 2. Oil removal chamber for nickel raffinate;

[0040] 3. First mixing chamber, 3-1. Chemical addition pipe for the first mixing chamber, 3-2. Stirrer for the first mixing chamber;

[0041] 4. Vulcanization chamber, 4-1. Stirrer for the vulcanization chamber;

[0042] 5. First precipitation separation chamber, 5-1. Baffle plate, 5-2. Discharge valve for the first precipitation separation chamber;

[0043] 6. Adsorption chamber, 6-1. D851 resin;

[0044] 7. Second mixing chamber, 7-1. Chemical addition pipe for the second mixing chamber, 7-2. Stirrer for the second mixing chamber;

[0045] 8. Second precipitation separation chamber, 8-1. Discharge valve for the second precipitation separation chamber;

[0046] 9. Alkalization chamber, 9-1. Chemical addition pipe for the alkalization chamber, 9-2. Stirrer for the alkalization chamber, 9-3. Gas-liquid separator, 9-4. Exhaust port;

[0047] 10. Third precipitation separation chamber, 10-1. Discharge valve for the third precipitation separation chamber, 10-2. Water outlet for the third precipitation separation chamber;

[0048] 11. Cooling chamber, 11-1. Cooling pipe, 11-2. Coolant addition port, 11-3. Coolant discharge valve;

[0049] 12. Fourth precipitation separation chamber, 12-1. Discharge valve for the fourth precipitation separation chamber, 12-2. Discharge pipe for the fourth precipitation separation chamber. Specific embodiments

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention.

[0051] As Figure 1 and Figure 2As shown in the figure, an integrated pretreatment device for smelting raffinate includes a cobalt raffinate degreasing chamber 1, a nickel raffinate degreasing chamber 2, a first mixing chamber 3, a sulfidation chamber 4, a first precipitation separation chamber 5, an adsorption chamber 6, a second mixing chamber 7, a second precipitation separation chamber 8, a basification chamber 9, a third precipitation separation chamber 10, a cooling chamber 11, and a fourth precipitation separation chamber 12.

[0052] The cobalt raffinate degreasing chamber 1 and the nickel raffinate degreasing chamber 2 are arranged side by side at the top of the device. The cobalt raffinate degreasing chamber 1 and the nickel raffinate degreasing chamber 2 have the same structure. The first mixing chamber 3 is arranged below the cobalt raffinate degreasing chamber 1 and the nickel raffinate degreasing chamber 2. The sulfidation chamber 4 is arranged below the first mixing chamber 3. The first precipitation separation chamber 5 is arranged on one side of the sulfidation chamber 4. The adsorption chamber 6 is arranged above the first precipitation separation chamber 5. The second mixing chamber 7 is arranged on one side of the adsorption chamber 6. The second precipitation separation chamber 8 is arranged below the second mixing chamber 7. The basification chamber 9 is arranged on one side of the second precipitation separation chamber 8. The third precipitation separation chamber 10 is arranged on one side of the basification chamber 9. The cooling chamber 11 is arranged on one side of the third precipitation separation chamber 10. The fourth precipitation separation chamber 12 is arranged on one side of the cooling chamber 11.

[0053] As a preferred embodiment of the present invention, the cobalt raffinate degreasing chamber 1 includes a degreasing barrel 1-1, an oil outlet 1-2, an oil filtering wall 1-3, and a liquid outlet 1-4.

[0054] The degreasing barrel 1-1 fills the inside of the cobalt raffinate degreasing chamber 1. The oil outlet 1-2 is arranged at the side bottom of the degreasing barrel 1-1. The oil filtering wall 1-3 is arranged on the left side inside the cobalt raffinate degreasing chamber 1. The inner wall of the oil filtering wall 1-3 is attached with a superhydrophilic and superoleophobic membrane. There are holes on the oil filtering wall 1-3. A liquid outlet 1-4 is arranged between the outer side of the oil filtering wall 1-3 and the outer wall of the device. The filtered cobalt raffinate flows away from the liquid outlet 1-4.

[0055] The superhydrophilic and superoleophobic membrane is a superhydrophilic and superoleophobic PANI / Ag / PVDF membrane, which is prepared using aniline (ANI), silver nitrate (AgNO3), and PVDF powder as raw materials. The prepared superhydrophilic and superoleophobic PANI / Ag / PVDF membrane has good oil-water separation performance, anti-fouling performance, and chemical stability.

[0056] As a preferred embodiment of the present invention, nickel and cobalt raffinate flow by gravity from the upper liquid outlet 1-4 into the first mixing chamber 3. Inside the first mixing chamber 3, there are a first mixing chamber chemical addition pipe 3-1, a first mixing chamber stirrer 3-2, a chemical addition meter, and a pH probe. The first mixing chamber 3 regulates the pH value of the wastewater to be greater than 5.0.

[0057] The raffinate flows into the sulfidation chamber 4 after mixing in the first mixing chamber 3, and a sulfidation chamber stirrer 4-1 is arranged inside the sulfidation chamber 4.

[0058] As a preferred embodiment of the present invention, a flow guiding plate 5-1 is arranged between the first precipitation separation chamber 5 and the sulfidation chamber 4, and the flow guiding plate 5-1 and the inner wall of the integrated pretreatment device for smelting raffinate form a water flow channel for the raffinate to enter the first precipitation separation chamber 5.

[0059] The bottom of the first precipitation separation chamber 5 is of a conical structure, and a first precipitation separation chamber discharge valve 5-2 is arranged at the bottom of the conical structure.

[0060] D851 resin 6-1 is placed inside the adsorption chamber 6, and the D851 resin 6-1 adsorbs the raffinate.

[0061] As a preferred embodiment of the present invention, a second mixing chamber chemical addition pipe 7-1, a second mixing chamber stirrer 7-2, a chemical addition meter, and a pH probe are arranged inside the second mixing chamber 7, and the pH value of the wastewater is adjusted to 8.5 - 9.5 in the second mixing chamber 7.

[0062] The bottom of the second precipitation separation chamber 8 is of a conical structure, and a second precipitation separation chamber discharge valve 8-1 is arranged at the bottom of the conical structure.

[0063] As a preferred embodiment of the present invention, an alkalization chamber chemical addition pipe 9-1, an alkalization chamber stirrer 9-2, a gas-liquid separator 9-3, and a pH probe are arranged inside the alkalization chamber 9, and an exhaust port 9-4 is arranged on the top wall of the alkalization chamber 9. The gas-liquid separator 9-3 realizes gas-liquid separation, and the separated ammonia gas is discharged from the exhaust port 9-4 for recycling.

[0064] As a preferred embodiment of the present invention, the third precipitation separation chamber 10 includes a third precipitation separation chamber discharge valve 10-1 and a third precipitation separation chamber water outlet 10-2. The raffinate slurry after the reaction in the alkalization chamber 9 flows into the third precipitation separation chamber 10 to form gypsum precipitation, and the gypsum is discharged through the third precipitation separation chamber discharge valve 10-1 at the bottom for dehydration, drying, and recycling.

[0065] The third precipitation separation chamber discharge valve 10-1 is arranged at the bottom of the third precipitation separation chamber 10, and the third precipitation separation chamber water outlet 10-2 is arranged inside the third precipitation separation chamber 10.

[0066] As a preferred embodiment of the present invention, the cooling chamber 11 includes a cooling pipe 11-1, a coolant addition port 11-2, and a coolant discharge valve 11-3.

[0067] The cooling pipe 11-1 is arranged inside the cooling chamber 11. The cooling pipe 11-1 is a spiral descending cooling pipe. The cooling pipe 11-1 is communicated with the water outlet 10-2 of the third precipitation separation chamber. The inside of the cooling chamber 11 is filled with coolant, and the coolant is tap water.

[0068] A coolant addition port 11-2 is arranged on the top wall of the cooling chamber 11. The bottom of the cooling chamber 11 is of a conical structure, and a coolant discharge valve 11-3 is arranged at the bottom of the conical structure.

[0069] As a preferred embodiment of the present invention, the fourth precipitation separation chamber 12 includes a fourth precipitation separation chamber discharge valve 12-1 and a fourth precipitation separation chamber discharge pipe 12-2.

[0070] The bottom of the fourth precipitation separation chamber 12 is of a conical structure, and a fourth precipitation separation chamber discharge valve 12-1 is arranged at the bottom of the conical structure. A fourth precipitation separation chamber discharge pipe 12-2 is arranged inside the fourth precipitation separation chamber 12.

[0071] The cooled raffinate crystallizes and precipitates in the fourth precipitation chamber 12 to generate sodium sulfate, which is discharged through the fourth precipitation separation chamber discharge valve 12-1 at the bottom, dehydrated, dried and recycled. The liquid separated by precipitation in the fourth precipitation separation chamber 12 is discharged through the fourth precipitation separation chamber discharge pipe 12-2 for further treatment.

[0072] A method for treating raffinate using an integrated pretreatment device for smelting raffinate is as follows:

[0073] S1. The nickel and cobalt raffinates are respectively filtered through a super-hydrophilic and super-oleophobic membrane in the cobalt raffinate degreasing chamber 1 and the nickel raffinate degreasing chamber 2. The oil is left in the oil removal barrel 1-1 and discharged from the oil outlet 1-2. The filtrate flows from the liquid outlet 1-4 to the first mixing chamber 3. In the first mixing chamber 3, the reagent addition meter of the first mixing chamber dosing pipe 3-1 is mixed according to the ammonium-magnesium molar ratio of 1:1, sulfide is added, and the first mixing chamber stirrer 3-2 stirs to adjust the pH to be greater than 5.0.

[0074] S . The mixed liquid enters the sulfidation chamber 4 to undergo a sulfidation reaction. Nickel ions Ni 2+ and cobalt ions Co 2+ in the mixed liquid react with sulfide ions S 2- to produce NiS precipitate and CoS precipitate. After being stirred by the sulfidation chamber stirrer 4-1, the sulfidated liquid enters the first precipitation separation chamber 5 to form a heavy slag removal, and then passes through the adsorption chamber 6. The DB851 resin 6-1 can adsorb and basically completely separate nickel and cobalt in the raffinate.

[0075] S3. After the raffinate is deweighted, it enters the second mixing chamber 7. An organic solvent and a phosphorus-containing solution are added through the chemical addition pipe 7-1 of the second mixing chamber, and the pH is adjusted to 8.5-9.5. After being mixed and stirred by the stirrer 7-2 of the second mixing chamber, it enters the second precipitation and separation chamber 8. Magnesium ions in the raffinate react and precipitate to obtain magnesium ammonium phosphate, which is discharged through the discharge valve 8-1 of the second precipitation and separation chamber.

[0076] S4. After the magnesium in the raffinate is precipitated, it enters the alkalization chamber 9. Lime milk is added through the chemical addition pipe 9-1 of the alkalization chamber, and the pH is adjusted to 10.5-11.0. The stirrer 9-2 of the alkalization chamber stirs and alkalizes to form a slurry and generate ammonia gas. After passing through the gas-liquid separator 9-3, the separated ammonia gas is discharged from the exhaust port 9-4 and recycled.

[0077] S5. The slurry passes through the gas-liquid separator 9-3 and enters the third precipitation and separation chamber 10, where gypsum is formed and discharged from the discharge valve 10-1 of the third precipitation and separation chamber for recycling.

[0078] S6. The precipitated slurry enters the cooling chamber 11 through the water outlet 10-2 of the third precipitation and separation chamber for cooling and crystallization. In the fourth precipitation and separation chamber 12, sodium sulfate crystals are precipitated and discharged through the discharge valve 12-1 of the fourth precipitation and separation chamber for recycling.

[0079] S7. The liquid separated by the fourth precipitation and separation chamber 12 is discharged through the discharge pipe 12-2 of the fourth precipitation and separation chamber for advanced treatment.

[0080] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Those skilled in the art can still adjust the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention also intends to include these changes and variations.

Claims

1. An integrated pretreatment device for smelting raffinate, characterized in that: It includes an oil removal chamber (1) for cobalt raffinate, an oil removal chamber (2) for nickel raffinate, a first mixing chamber (3), a sulfidation chamber (4), a first precipitation separation chamber (5), an adsorption chamber (6), a second mixing chamber (7), a second precipitation separation chamber (8), an alkalization chamber (9), a third precipitation separation chamber (10), a cooling chamber (11) and a fourth precipitation separation chamber (12); The oil removal chamber (1) for cobalt raffinate and the oil removal chamber (2) for nickel raffinate are arranged side by side at the top of the device. The oil removal chamber (1) for cobalt raffinate and the oil removal chamber (2) for nickel raffinate have the same structure. The first mixing chamber (3) is arranged below the oil removal chamber (1) for cobalt raffinate and the oil removal chamber (2) for nickel raffinate. The sulfidation chamber (4) is arranged below the first mixing chamber (3). The first precipitation separation chamber (5) is arranged on one side of the sulfidation chamber (4). The adsorption chamber (6) is arranged above the first precipitation separation chamber (5). The second mixing chamber (7) is arranged on one side of the adsorption chamber (6). The second precipitation separation chamber (8) is arranged below the second mixing chamber (7). The alkalization chamber (9) is arranged on one side of the second precipitation separation chamber (8). The third precipitation separation chamber (10) is arranged on one side of the alkalization chamber (9). The cooling chamber (11) is arranged on one side of the third precipitation separation chamber (10). The fourth precipitation separation chamber (12) is arranged on one side of the cooling chamber (11).

2. An integrated pretreatment device for smelting raffinate according to claim 1, characterized in that: The oil removal chamber (1) for cobalt raffinate includes an oil removal barrel (1-1), an oil outlet (1-2), an oil filtering wall (1-3) and a liquid outlet (1-4); The oil removal barrel (1-1) fills the inside of the oil removal chamber (1) for cobalt raffinate. The oil outlet (1-2) is arranged at the side bottom of the oil removal barrel (1-1). The oil filtering wall (1-3) is arranged on the left side inside the oil removal chamber (1) for cobalt raffinate. A super-hydrophilic and super-oleophobic film is attached to the inner wall of the oil filtering wall (1-3). There are holes on the oil filtering wall (1-3). A liquid outlet (1-4) is arranged between the outer side of the oil filtering wall (1-3) and the outer wall of the device.

3. An integrated pretreatment device for smelting raffinate according to claim 2, characterized in that: Inside the first mixing chamber (3), there are a first mixing chamber chemical addition pipe (3-1), a first mixing chamber stirrer (3-2), a chemical addition meter and a pH probe. The first mixing chamber (3) adjusts the pH value of the wastewater to be greater than 5.0; Inside the sulfidation chamber (4), there is a sulfidation chamber stirrer (4-1).

4. An integrated pretreatment device for smelting raffinate according to claim 3, characterized in that: A diversion plate (5-1) is arranged between the first precipitation separation chamber (5) and the sulfidation chamber (4). The bottom of the first precipitation separation chamber (5) is of a conical structure, and a first precipitation separation chamber discharge valve (5-2) is arranged at the bottom of the conical structure; D851 resin (6-1) is placed inside the adsorption chamber (6).

5. An integrated pretreatment device for smelting raffinate according to claim 4, characterized in that: Inside the second mixing chamber (7), there are a second mixing chamber chemical addition pipe (7-1), a second mixing chamber stirrer (7-2), a chemical addition meter, and a pH probe. The pH value of the wastewater in the second mixing chamber (7) is adjusted to 8.5 - 9.5; The bottom of the second precipitation separation chamber (8) is of a conical structure, and a second precipitation separation chamber discharge valve (8-1) is provided at the bottom of the conical structure.

6. An integrated pretreatment device for smelting raffinate according to claim 5, characterized in that: Inside the alkalization chamber (9), there are an alkalization chamber chemical addition pipe (9-1), an alkalization chamber stirrer (9-2), a gas-liquid separator (9-3), and a pH probe. An exhaust port (9-4) is provided on the top wall of the alkalization chamber (9).

7. An integrated pretreatment device for smelting raffinate according to claim 6, characterized in that: The third precipitation separation chamber (10) includes a third precipitation separation chamber discharge valve (10-1) and a third precipitation separation chamber water outlet (10-2); The third precipitation separation chamber discharge valve (10-1) is provided at the bottom of the third precipitation separation chamber (10), and the third precipitation separation chamber water outlet (10-2) is provided inside the third precipitation separation chamber (10).

8. An integrated pretreatment device for smelting raffinate according to claim 7, characterized in that: The cooling chamber (11) includes a cooling pipe (11-1), a coolant addition port (11-2), and a coolant discharge valve (11-3); The cooling pipe (11-1) is provided inside the cooling chamber (11). The cooling pipe (11-1) is a spiral downward cooling pipe. The cooling pipe (11-1) is communicated with the third precipitation separation chamber water outlet (10-2). The inside of the cooling chamber (11) is filled with coolant. A coolant addition port (11-2) is provided on the top wall of the cooling chamber (11). The bottom of the cooling chamber (11) is of a conical structure, and a coolant discharge valve (11-3) is provided at the bottom of the conical structure.

9. An integrated pretreatment device for smelting raffinate according to claim 8, characterized in that: The fourth precipitation separation chamber (12) includes a fourth precipitation separation chamber discharge valve (12-1) and a fourth precipitation separation chamber discharge pipe (12-2); The bottom of the fourth precipitation separation chamber (12) is of a conical structure, and a fourth precipitation separation chamber discharge valve (12-1) is provided at the bottom of the conical structure. A fourth precipitation separation chamber discharge pipe (12-2) is provided inside the fourth precipitation separation chamber (12).

10. A method for treating raffinate using the integrated pretreatment device for smelting raffinate according to any one of claims 1-9, characterized in that, The steps are as follows: S1. After the nickel and cobalt raffinates are respectively filtered through a super-hydrophilic and super-oleophobic membrane in the cobalt raffinate degreasing chamber (1) and the nickel raffinate degreasing chamber (2), the oil is left in the oil removal barrel (1-1) and discharged from the oil outlet (1-2). The filtrate flows from the liquid outlet (1-4) to the first mixing chamber (3). In the first mixing chamber (3), the chemical addition meter of the first mixing chamber chemical addition pipe (3-1) mixes the chemicals in a molar ratio of ammonium to magnesium of 1:1, adds sulfide, and the first mixing chamber stirrer (3-2) stirs to adjust the pH to be greater than 5.0; S2. The mixed solution enters the vulcanization chamber (4) to undergo a vulcanization reaction. Nickel ions Ni 2+ and cobalt ions Co 2+ in the mixed solution react with sulfide ions S 2- to produce NiS precipitate and CoS precipitate. After being stirred by the stirrer (4-1) in the vulcanization chamber, the mixture enters the first precipitation separation chamber (5) to form heavy slag removal. Then, it passes through the adsorption chamber (6), and the DB851 resin (6-1) can adsorb and basically completely separate nickel and cobalt in the raffinate; S3. After the raffinate is deweighted, it enters the second mixing chamber (7). An organic solvent and a phosphorus-containing solution are added through the chemical addition pipe (7-1) of the second mixing chamber, and the pH is adjusted to 8.5-9.

5. After being mixed and stirred by the stirrer (7-2) of the second mixing chamber, it enters the second precipitation and separation chamber (8). Magnesium ions in the raffinate react and precipitate to obtain magnesium ammonium phosphate, which is discharged through the discharge valve (8-1) of the second precipitation and separation chamber; S4. After magnesium precipitation of the raffinate, it enters the alkalization chamber (9). Lime milk is added through the chemical addition pipe (9-1) of the alkalization chamber, and the pH is adjusted to 10.5-11.

0. It is stirred and alkalized by the stirrer (9-2) of the alkalization chamber to form a slurry and generate ammonia gas. After passing through the gas-liquid separator (9-3), the separated ammonia gas is discharged from the exhaust port (9-4) and recycled; S5. The slurry passes through the gas-liquid separator (9-3) and enters the third precipitation and separation chamber (10). Gypsum is formed in the third precipitation and separation chamber (10) and discharged from the discharge valve (10-1) of the third precipitation and separation chamber for recycling; S6. The precipitated slurry enters the cooling chamber (11) through the water outlet (10-2) of the third precipitation and separation chamber, cools down and crystallizes. In the fourth precipitation and separation chamber (12), sodium sulfate crystals are precipitated and discharged through the discharge valve (12-1) of the fourth precipitation and separation chamber for recycling; S7. The liquid separated by precipitation in the fourth precipitation and separation chamber (12) is discharged through the discharge pipe (12-2) of the fourth precipitation and separation chamber for advanced treatment.

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