System and method for treating nickel anode slime through water pressure method

Abstract

The invention provides a system for treating nickel anode slime through a water pressure method. The system comprises a slurrying tank, a primary sulfur melting container and a first filtering unit which are connected in sequence, and a secondary sulfur melting container and a second filtering unit which are connected in sequence, air inlets of the primary sulfur melting container and the secondary sulfur melting container are connected with a steam supply mechanism; each of the first filtering unit and the second filtering unit is provided with a feeding end, a liquid discharging end and a solid discharging end; a feed port of the primary sulfur melting container is connected with a discharge port of the pulping tank, and a discharge port of the primary sulfur melting container is connected with a feed end of the first filtering unit; a feeding hole of the secondary sulfur melting container is used for receiving materials at the solid discharging end of the first filtering unit, and a discharging hole of the secondary sulfur melting container is connected with the feeding end of the second filtering unit. By means of the system, efficient separation of sulfur and other valuable metal materials in the nickel anode slime can be achieved, the liquid-solid ratio of the needed sulfur melting slurry is small, then the equipment size and investment can be reduced, and the heat utilization efficiency is high. The invention further provides a method for treating the nickel anode slime through a water pressure method, the recovery rate of sulfur is larger than 98%, and efficient enrichment of precious metal and valuable metal in the nickel anode slime can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a system and method for treating nickel anode slime by a hydraulic method. Background Art

[0002] Nickel sulfide anode electrolytic refining produces a high yield of anode mud. Nickel anode mud is a by-product of nickel electrolytic refining. Its composition is complex and varies significantly depending on the origin. It mainly contains sulfur, nickel, copper, iron, platinum group metals, gold, silver and other elements. Its sulfur content can be as high as 80%. Since the main reaction at the anode during the electrolysis process is the dissolution of Ni3S2, nickel is produced in the form of Ni 2+ into the electrolyte, and S 2- Electrons are gained to form elemental sulfur, ultimately resulting in the sulfur in nickel anode mud being primarily present as elemental sulfur, with a small amount existing as metallic sulfides or sulfates. Currently, with the growing demand for nickel and the continued expansion of nickel smelting, the output of nickel anode mud is also rising. For example, the electrolysis workshops of large nickel smelters can produce tens of thousands of tons of nickel anode mud annually. If this nickel anode mud is not properly disposed of, it not only wastes valuable and precious metal resources, but also pollutes the surrounding environment with sulfur-containing substances.

[0003] During the nickel anode slime recovery process, high sulfur content not only corrodes and damages subsequent processing equipment, shortening its service life, but also interferes with the extraction and separation of valuable and precious metals, reducing metal recovery rate and purity. Given these characteristics of nickel anode slime, efficient sulfur removal prior to extracting valuable and precious metals becomes a critical step in ensuring subsequent metal recovery.

[0004] Currently, the hot filtration desulfurization process is primarily used to treat nickel anode slime, which exhibits significant advantages over other processes. However, this process still faces challenges with low desulfurization efficiency, high sulfur content in the desulfurization tailings, and severe environmental pollution. This complicates the subsequent recovery of the desulfurized anode slime, increasing equipment investment and costs. Summary of the Invention

[0005] In view of the above technical problems, the object of the present invention is to provide a system and method for treating nickel anode slime by hydraulic method.

[0006] To achieve the above object, the present invention proposes the following technical solutions: In a first aspect, a system for treating nickel anode slime by hydraulic pressure method includes a slurrying tank, a primary sulfur melting vessel, a first filtering unit connected in sequence, and a secondary sulfur melting vessel, a second filtering unit connected in sequence; The primary sulfur melting container and the secondary sulfur melting container are both provided with a feed port, an air inlet and a discharge port, and the air inlets of the primary sulfur melting container and the secondary sulfur melting container are both connected to a steam supply mechanism; The first filter unit and the second filter unit are both provided with a feed end, a liquid discharge end and a solid discharge end; The feed port of the primary sulfur melting container is connected to the discharge port of the slurry making tank, and the discharge port is connected to the feed end of the first filter unit; The secondary sulfur melting container receives the material from the solid discharge end of the first filter unit, and the discharge port is connected to the feed end of the second filter unit.

[0007] In a second aspect, a method for treating nickel anode slime by hydraulic pressure is provided, wherein the method uses the aforementioned system to treat nickel anode slime, comprising: Mixing nickel anode mud and water to prepare a first slurry; The slurry is fed into a primary sulfur melting container, and steam is introduced into the primary sulfur melting container to heat the slurry, thereby performing a primary hydraulic sulfur melting; The pressurized material obtained by the primary hydraulic sulfur melting is first filtered to obtain a liquid sulfur solution and primary desulfurization slag; Adding primary desulfurization slag, water and / or returned aqueous solution into the secondary sulfur melting container, introducing steam to heat the second slurry, and performing secondary hydraulic sulfur melting; The pressurized material obtained from the secondary hydraulic sulfur melting is filtered for the second time to obtain liquid sulfur solution and secondary desulfurization slag.

[0008] Compared with the prior art, one or more of the above technical solutions can achieve at least one of the following beneficial effects: (1) The system provided by the present invention can achieve efficient separation of sulfur from other valuable metal materials in nickel anode mud. The liquid-to-solid ratio of the required molten sulfur slurry is small, thereby reducing the equipment volume and investment, and achieving high heat utilization efficiency.

[0009] (2) The system provided by the present invention adopts continuous coarse filtration and fine filtration. The coarse filtration and fine filtration are designed as a continuous "stirring + spiral extrusion" filtration process, and combined with the self-pressure of the material during the coarse filtration process, the material filtration and desulfurization efficiency are effectively improved.

[0010] (3) Using pressurized steam to heat the nickel anode mud slurry in the sulfur melting container can not only produce high heat transfer efficiency, but also improve the sulfur melting effect, reduce the liquid-to-solid ratio of the sulfur melting slurry, and reduce equipment volume and investment.

[0011] (4) Water cooling can be used to cool and solidify sulfur and precipitate it from the aqueous solution phase, thereby obtaining a desalted sulfur product with high purity. On the other hand, the aqueous solution can be returned for continued use, and the sulfate in the aqueous solution is further dissolved and enriched. When the sulfate reaches a certain concentration, open-circuit recovery is performed. The aqueous solution can be recycled in the entire system, which not only reduces the demand for water resources but also avoids the generation of a large amount of wastewater.

[0012] (5) The treatment method provided by the present invention has a sulfur recovery rate of more than 98%, which can achieve efficient enrichment of precious metals and valuable metals in nickel anode mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are some embodiments of the present invention.

[0014] Figure 1 Schematic diagram of the system for treating nickel anode slime using the hydraulic method.

[0015] Figure 2 It is a structural diagram of the fine filtration device and the coarse filtration device.

[0016] Figure 3 Schematic diagram of the process flow. 1. Slurry making tank; 2. Primary sulfur melting container; 3. First coarse filtration device; 4. First fine filtration device; 5. Secondary sulfur melting container; 6. Second coarse filtration device; 7. Second fine filtration device; 8. Cooling container; 9. Liquid-solid separation tank; 10. Coarse filtration screen; 11. Stirring paddle; 12. Extrusion screw; 13. Fine filtration screen. DETAILED DESCRIPTION

[0017] In response to the problems existing in the existing hot filtration desulfurization process for treating nickel anode mud, the applicant has developed a system after extensive research. This system is used to treat nickel anode mud. It can not only achieve efficient separation of sulfur and other valuable metal materials in nickel anode mud, but also achieve a sulfur removal rate of over 98%. The liquid-to-solid ratio of the required molten sulfur slurry is small, thereby reducing equipment volume and investment, and has a high thermal utilization rate.

[0018] Specifically, some embodiments of the present invention provide a system for treating nickel anode slime by hydraulic pressure, comprising a slurrying tank, a primary sulfur melting container, a first filtering unit connected in sequence, and a secondary sulfur melting container, a second filtering unit connected in sequence; The primary sulfur melting container and the secondary sulfur melting container are both provided with a feed port, an air inlet and a discharge port, and the air inlets of the primary sulfur melting container and the secondary sulfur melting container are both connected to a steam supply mechanism; The first filter unit and the second filter unit are both provided with a feed end, a liquid discharge end and a solid discharge end; The feed port of the primary sulfur melting container is connected to the discharge port of the slurry making tank, and the discharge port is connected to the feed end of the first filter unit; The feed port of the secondary sulfur melting container receives the material from the solid discharge end of the first filter unit, and the discharge port is connected to the feed end of the second filter unit.

[0019] In some preferred embodiments, the system further includes a cooling container, which is provided with a feed port, a cooling medium inlet and a discharge port, wherein the feed port is connected to the liquid discharge end of the first filter unit and the liquid discharge end of the second filter unit respectively.

[0020] In some preferred embodiments, the system further comprises a liquid-solid separation tank, which is connected to the discharge port of the cooling container.

[0021] In some preferred embodiments, the secondary sulfur melting container is further provided with a liquid inlet for adding liquid materials, such as water and / or returned aqueous solution, into the secondary sulfur melting container.

[0022] In some preferred embodiments, the first filter unit includes a first coarse filter device and a first fine filter device connected in sequence; the second filter unit includes a second coarse filter device and a second fine filter device connected in sequence.

[0023] In some preferred embodiments, the first coarse filtration device, the first fine filtration device, the second coarse filtration device, and the second fine filtration device are all provided with a feed inlet, a liquid discharge port, and a solid discharge port.

[0024] In some preferred embodiments, the feed port of the first coarse filtration device is connected to the discharge port of the primary sulfur melting container, and the solid discharge port of the first coarse filtration device is connected to the feed port of the first fine filtration device.

[0025] In some preferred embodiments, the feed port of the second coarse filtration device is connected to the discharge port of the secondary sulfur melting container, and the solid discharge port of the second coarse filtration device is connected to the feed port of the second fine filtration device.

[0026] In some preferred embodiments, the liquid outlets of the first coarse filtration device, the first fine filtration device, the second coarse filtration device, and the second fine filtration device are all connected to the feed port of the cooling container.

[0027] In some preferred embodiments, a stirring paddle is provided in the filter chamber of the first coarse filtration device and the second coarse filtration device, and the stirring paddle is used to scrape off the solid material on the inner wall of the filter chamber; the stirring paddle is a single-layer stirring paddle or a multi-layer stirring paddle, preferably a multi-layer stirring paddle.

[0028] In some preferred embodiments, the first coarse filtration device and the second coarse filtration device both include: The shell has a feed port on the upper side of the shell sidewall, a liquid discharge port on the lower side of the shell sidewall, and a solid discharge port at the bottom of the shell; the liquid discharge port is connected to the shell; A filter chamber is provided in the housing, wherein the sidewall of the filter chamber is formed by a filter screen, and an interlayer is formed between the filter chamber and the housing; the feed inlet and the solid discharge port of the housing are connected to the filter chamber; The stirring paddle is installed inside the filter chamber and is used to scrape off the solid materials on the filter screen by stirring.

[0029] In some preferred embodiments, the first fine filtration device and the second fine filtration device are mechanical filter press equipment; and the mechanical filter press equipment is a screw extruder.

[0030] In some preferred embodiments, a method for treating nickel anode slime by hydraulic pressure is further provided, wherein the method uses the aforementioned system to treat nickel anode slime, comprising: Mixing nickel anode mud and water to prepare a first slurry; The slurry is fed into a primary sulfur melting container, and steam is introduced into the primary sulfur melting container to heat the slurry, thereby performing a primary hydraulic sulfur melting; The pressurized material obtained by the primary hydraulic sulfur melting is first filtered to obtain a liquid sulfur solution and primary desulfurization slag; Adding primary desulfurization slag, water and / or returned aqueous solution into the secondary sulfur melting container, introducing steam to heat the second slurry, and performing secondary hydraulic sulfur melting; The pressurized material obtained from the secondary hydraulic sulfur melting is filtered for the second time to obtain liquid sulfur solution and secondary desulfurization slag.

[0031] It is worth noting that in the provided method for treating nickel anode slime by the hydraulic method, water refers not only to ordinary water, but also to the aqueous solution separated from the subsequent liquid sulfur solution.

[0032] In some preferred embodiments, the obtained liquid sulfur solution is water-cooled and solid-liquid separated to obtain sulfur and an aqueous solution; at least a portion of the aqueous solution can be returned to prepare a slurry with nickel anode mud and / or primary desulfurization slag.

[0033] In some preferred embodiments, the obtained secondary desulfurization slag is used to extract precious metals and valuable metals.

[0034] In some preferred embodiments, the first filtration and the second filtration are both continuous coarse filtration and fine filtration.

[0035] In some preferred embodiments, the liquid-to-solid ratio of the first slurry is 0.6~1:1 mL / g, for example, 0.6:1 mL / g, 0.65:1 mL / g, 0.7:1 mL / g, 0.75:1 mL / g, 0.8:1 mL / g, 0.85:1 mL / g, 0.9:1 mL / g, 0.95:1 mL / g, 1:1 mL / g, etc.

[0036] In some preferred embodiments, the temperature of the primary hydraulic sulfur melting is 130-150°C, for example, 130°C, 132°C, 135°C, 138°C, 140°C, 142°C, 145°C, 148°C, 150°C, etc., more preferably 130-140°C.

[0037] In some preferred embodiments, the duration of the primary hydraulic sulfur melting is 30 to 50 minutes, for example, 30 minutes, 32 minutes, 35 minutes, 38 minutes, 40 minutes, 42 minutes, 45 minutes, 48 ​​minutes, 50 minutes, etc.

[0038] In some preferred embodiments, the temperature of the secondary hydraulic sulfur melting is 130-150°C, for example, 130°C, 132°C, 135°C, 138°C, 140°C, 142°C, 145°C, 148°C, 150°C, etc., more preferably 130-140°C.

[0039] In some preferred embodiments, the duration of the secondary hydraulic sulfur melting is 30 to 50 minutes, for example, 30 minutes, 32 minutes, 35 minutes, 38 minutes, 40 minutes, 42 minutes, 45 minutes, 48 ​​minutes, 50 minutes, etc.

[0040] In some preferred embodiments, the liquid-to-solid ratio of the second slurry is 0.4~0.8:1mL / g, for example, 0.4:1mL / g, 0.45:1mL / g, 0.5:1mL / g, 0.55:1mL / g, 0.6:1mL / g, 0.65:1mL / g, 0.7:1mL / g, 0.75:1mL / g, 0.8:1mL / g, etc.

[0041] To facilitate understanding of the present invention, the present invention will be described in more comprehensive and detailed form below in conjunction with the accompanying drawings and preferred embodiments. However, the protection scope of the present invention is not limited to the following specific embodiments.

[0042] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0043] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0044] Example 1 The system for treating nickel anode mud by hydraulic pressure is shown in the following diagram: Figure 1 Shown, including: The slurry tank 1 is used to mix the solid material and the liquid material to prepare the slurry; The primary sulfur melting vessel 2 is a pressure vessel having a feed port, an air inlet, and a discharge port. The feed port is connected to the slurry making tank 1 via a conveying pipeline and is used to receive the slurry in the slurry making tank 1. The air inlet is used to convey heated pressure steam (such as high-temperature pressure steam) into the primary sulfur melting vessel 2 to heat the material (slurry) in the primary sulfur melting vessel 2. The first coarse filtering device 3 includes a feed port, a liquid material discharge port, and a solid material discharge port; the feed port is connected to the discharge port of the primary sulfur melting container 2 through a conveying pipeline, and is used to receive the pressurized material in the primary sulfur melting container 2; the liquid material discharge port is provided at the lower part of the side wall of the first coarse filtering device 3, and is used to discharge the liquid material obtained by the first coarse filtration; the solid material discharge port is provided at the bottom of the first coarse filtering device 3, and is used to discharge the filter residue obtained by the first coarse filtration; The first fine filtration device 4 is provided below the first coarse filtration device 3 and includes a feed inlet, a liquid material discharge port, and a solid material discharge port; the feed inlet is connected to the discharge port of the first coarse filtration device 3 and is used to receive the filter residue obtained by the coarse filtration; the liquid material discharge port is used to discharge the filtrate obtained by the first fine filtration; and the solid material discharge port is used to discharge the filter residue obtained by the first fine filtration; The secondary sulfur melting vessel 5 is a pressure vessel comprising a feed port, an air inlet, and a discharge port. The feed port is used for feeding (the filter residue obtained from the first fine filtration can be added to the secondary sulfur melting vessel 5 through the feed port); the air inlet is used for conveying heated pressurized steam (e.g., high-temperature pressurized water vapor) into the secondary sulfur melting vessel 5 to heat the material in the secondary sulfur melting vessel 5; and the discharge port is used for discharging the pressurized material obtained from the reaction. The second coarse filtering device 6 includes a feed port, a liquid material discharge port, and a solid material discharge port; the feed port is sealed and connected to the discharge port of the secondary sulfur melting container 5 through a conveying pipeline, and is used to receive the pressurized material in the secondary sulfur melting container 5; the liquid material discharge port is provided at the lower part of the side wall of the second coarse filtering device 6, and is used to discharge the liquid material obtained by the second coarse filtration; the solid material discharge port is provided at the bottom of the second coarse filtering device 6, and is used to discharge the filter residue obtained by the second coarse filtration; The second fine filtration device 7 is arranged below the second coarse filtration device 6, and includes a feed port, a liquid material discharge port and a solid material discharge port. The feed port is connected to the discharge port of the second coarse filtration device 6, and is used to receive the filter residue obtained by the second coarse filtration; the liquid material discharge port is used to discharge the filtrate obtained by the second fine filtration; the solid material discharge port is used to discharge the filter residue obtained by the second fine filtration.

[0045] When the above system is used to treat nickel anode mud, the nickel anode mud and water are stirred in the slurry making tank 1 to make slurry, and the slurry is transported to the primary sulfur melting container 2. Heated pressure steam is introduced into the primary sulfur melting container 2 to heat the slurry in the primary sulfur melting container 2 so that the slurry is heated and kept warm, so that the nickel anode mud slurry undergoes water pressure sulfur melting leaching in the primary sulfur melting container 2 to melt the sulfur in the nickel anode mud slurry. The pressure slurry obtained by leaching enters the first coarse filtration device 3 and is filtered under the pressure of the pressure slurry. The obtained liquid sulfur solution is discharged through the liquid material discharge port of the first coarse filtration device 3 after filtration. The filtered residue continuously enters the first fine filtration device 4, where it continues to pass through the mechanical extrusion structure of the fine filtration device, thereby separating the residual liquid sulfur solution from the desulfurization slag through mechanical extrusion. The entire coarse filtration and fine filtration processes are continuous and nearly synchronous. The desulfurization slag enters the secondary sulfur melting vessel 5 through the feed port. Water and steam are introduced into the secondary sulfur melting vessel 5 for secondary hydraulic sulfur melting, further melting the residual sulfur in the desulfurization slag. The resulting pressurized material is subjected to the pressure of the second coarse filtration device 6 and the mechanical extrusion of the second fine filtration device 7, further separating the liquid sulfur solution from the slag. The above system ensures that the pressure and temperature of the pressurized materials obtained in the primary sulfur melting vessel 2 and the secondary sulfur melting vessel 5 are maintained throughout the coarse filtration process, thereby achieving efficient separation of the high-viscosity liquid sulfur solution from the filter residue in the two coarse filtration processes. It also ensures that the temperature of the slag obtained from the two coarse filtration processes is high, and the sulfur entrained in the slag remains almost liquid. The liquid sulfur is separated from the solids in the slag through fine filtration. Through the two desulfurization processes, efficient sulfur removal from nickel anode mud is achieved. When the above system is used to treat nickel anode mud, compared with the existing process, it can not only simplify the process steps and reduce the equipment volume, but also significantly improve the separation effect of sulfur and slag.

[0046] When the above system is used to treat nickel anode mud, the material can be processed intermittently or continuously. When the material is processed continuously, not only the production efficiency is higher, but also the treatment effect is better.

[0047] The system includes a cooling container 8, which includes a feed port, a liquid inlet and a discharge port; the feed port is connected to the liquid material discharge ports of the first coarse filtration device 3, the first fine filtration device 4, the second coarse filtration device 6 and the second fine filtration device 7 through a pipeline, and is used to receive the liquid material obtained by the first coarse filtration, the first fine filtration, the second coarse filtration and the second fine filtration; the liquid inlet is used to transport a cooling medium, such as water, into the cooling container 8; and the discharge port is used to discharge the material in the cooling container 8.

[0048] The system also includes a liquid-solid separation tank 9, which is used to receive the material discharged from the cooling container 8. The material is separated into liquid and solid in the liquid-solid separation tank 9 through a vibrating screen. The sulfur product is produced at the upper part and the aqueous solution is discharged from the lower part. The separated aqueous solution can be used to return to prepare slurry with nickel anode mud or primary desulfurization slag obtained after the first fine filtration, or it can be returned to the cooling container 8 for cooling the material.

[0049] The filter chambers of the first and second coarse filter devices 3 and 6 are further provided with stirring paddles 11. The stirring paddles 11 can be used to scrape off solid material adhering to the side walls of the filter chambers after coarse filtration, thereby preventing the solid material from clogging the mesh of the filter chambers and improving the filtration effect. As a preferred embodiment, the side walls of the filter chambers are in the shape of filter cartridges.

[0050] In the first fine filtration device 4 and the second fine filtration device 7, the feed port and the discharge port are respectively provided at the two ends of the fine filtration device. The fine filtration device is provided with an extrusion screw (threaded blade) 12 extending from one end to the other end. The extrusion screw 12 can not only squeeze the material to promote filtration, but also transport the filter residue from the feed end to the discharge end; the liquid material discharge port is provided at one end of the fine filtration device close to the discharge port, and is used to discharge the liquid sulfur solution obtained by the fine filtration; the discharge port is used to discharge the desulfurized anode mud obtained by the fine filtration.

[0051] In the above system, it is preferred that the primary sulfur melting container 2, the first coarse filtration device 3 and the first fine filtration device 4 are sealed and connected in sequence, and the secondary sulfur melting container 5, the second coarse filtration device 6 and the second fine filtration device 7 are sealed and connected in sequence. The sealed connection is conducive to maintaining the temperature and pressure of the materials in the sulfur melting container and the coarse filtration device, and the temperature of the material in the fine filtration device, thereby ensuring the sulfur separation effect.

[0052] The schematic diagram of the coarse filtration device and the fine filtration device is as follows Figure 2 shown.

[0053] The first coarse filtration device 3 and the second coarse filtration device 6 can adopt similar structures. The main difference between them and the existing filters is that a stirring paddle 11 is further provided in the filter chamber, specifically comprising: The shell has a feed port on the upper side of the shell sidewall, a liquid material discharge port on the lower side of the shell sidewall, and a solid material discharge port on the bottom of the shell; the liquid material discharge port is connected to the shell; The filter chamber is provided in the housing. The filter chamber is enclosed by a coarse filter screen 10. A sandwich is formed between the coarse filter screen 10 and the housing. The feed inlet and the solid material discharge port of the housing are both connected to the filter chamber. The stirring paddle 11 is provided inside the filter chamber and is used to scrape the solid materials on the coarse filter screen 10 and discharge them through the solid material discharge port.

[0054] The material obtained after sulfur melting in the sulfur melting container enters the filter chamber of the coarse filtration device through the feed port under pressure. Under the action of pressure, the liquid sulfur passes through the coarse filter screen 10 into the interlayer and is discharged from the coarse filtration device through the liquid sulfur outlet. The remaining anode mud in the filter chamber is scraped into the lower discharge port by the stirring slurry 11 and enters the fine filtration device.

[0055] The stirring paddle 11 may be a single-layer stirring paddle or a multi-layer stirring paddle, preferably a multi-layer stirring paddle, and the stirring paddle 11 is driven by a motor.

[0056] The first fine filtration device 4 and the second fine filtration device 7 are both spiral filtration devices, such as screw extruders, including: The shell is provided with a feed port, a solid material discharge port and a liquid material outlet; the liquid material discharge port is connected to the shell; The filter chamber is surrounded by a fine filter screen 13 and is disposed in the housing; a sandwich is formed between the filter chamber and the housing; the feed port and the solid material discharge port are both connected to the filter chamber; An extrusion screw 12 is provided in the filter chamber; The transmission shaft is fixedly connected to one end of the extrusion screw 12, specifically, it can be fixedly connected to the end of the extrusion screw 12 close to the feed port; The motor is arranged outside the shell and is fixedly connected to the transmission shaft. It is used to drive the transmission shaft to drive the extrusion screw 12 to rotate in the filter chamber, and then through the extrusion and conveying action of the extrusion screw 12, the liquid in the material is squeezed out and the solid material is conveyed to the end of the extrusion screw 12.

[0057] After the material discharged from the coarse filtration unit enters the filter chamber of the spiral fine filtration unit, solid-liquid separation is achieved under the extrusion action of extrusion screw 12. The liquid sulfur solution passes through the fine filter screen 13 and enters the interlayer before being discharged through the liquid sulfur outlet. The material inside the filter chamber is discharged from the end of extrusion screw 12 through the discharge port, achieving efficient desulfurization. The coarse and fine filtration design is a continuous "stirring + spiral extrusion" filtration process, which effectively improves material filtration and desulfurization efficiency.

[0058] The slurry making tank 1 , the primary sulfur melting container 2 and the secondary sulfur melting container 5 are provided with stirring paddles.

[0059] The second sulfur melting vessel 5 may also be provided with a liquid inlet for conveying liquid material, such as water and / or returned aqueous solution, into the second sulfur melting vessel 5. The liquid inlet is optional. When the entire process is discontinuous, the liquid material can be mixed with the primary coarse filter residue and then fed through the feed inlet of the secondary sulfur melting vessel 5. When the entire process is continuous, the liquid inlet is preferably provided.

[0060] It is worth noting that in order to meet the pressure requirements, technical personnel in this field can set the materials of some devices, containers or components to pressure-resistant materials according to actual conditions. For example, the shell and filter of the coarse filtration device, as well as the molten sulfur container and some conveying pipelines (such as the pipeline connecting the molten sulfur container and the coarse filtration device) are all made of materials that can withstand pressure.

[0061] It is worth noting that in order to ensure the effectiveness of the process implementation, technical personnel in this field can set valves on the inlet and outlet pipelines of some components according to actual needs; in order to realize the flow of materials, technical personnel in this field can set material conveying equipment on the connecting pipelines according to actual needs, such as pumps, etc., and valves and material conveying equipment can be set conventionally.

[0062] Example 2 This embodiment adopts Figure 1 The system shown treats nickel anode slime and includes: 1t / h of nickel anode mud (containing Ni2.5%, Cu1.2%, S80%, Au26g / t, Pt20g / t, Pd30g / t) is fed into a pulping tank 1 to add water and the returned sulfate-containing aqueous solution for slurrying, with a liquid-solid ratio of 0.6:1 (mL / g). The slurry is fed into a primary sulfur melting container 2 and steam is introduced for primary hydraulic sulfur melting. The temperature is controlled at 130°C and the time is 30min. The molten material is fed into a first coarse filtration device 3 and a first fine filtration device 4 for first coarse filtration and fine filtration. The produced liquid sulfur is fed to a cooling container 8 is cooled to a solid state, and then undergoes liquid-solid separation in a liquid-solid separation tank 9 to produce a sulfur product. The produced primary desulfurized anode mud is fed to a secondary sulfur melting vessel 5, where water or liquid sulfur is added and the resulting aqueous solution, after solid-liquid separation, is cooled in a cooling vessel 8. Steam is then introduced to perform a secondary hydraulic sulfur melting operation. The temperature is controlled at 130°C for 30 minutes. The molten material is then fed to a second coarse filtration device 6 and a second fine filtration device 7 for secondary coarse and fine filtration. The produced liquid sulfur is fed to a cooling vessel 8 and cooled to a solid state. Solid-liquid separation is then performed in a liquid-solid separation tank 9 to produce a sulfur product. The total output of sulfur product (containing 99.4% sulfur) is 0.79 t / h, with a calculated sulfur recovery rate of 98.8%. The output of secondary desulfurized anode mud (Ni 9.5%, Cu 5.7%, S 4.8%, Au 124g / t, Pt 95g / t, Pd 143g / t) is 0.21 t / h.

[0063] Comparative Example 1 The conditions were similar to those in Example 2, except that no water was added to the materials during the primary and secondary sulfur melting processes, with only steam flowing through. Testing of the resulting secondary desulfurized anode slime revealed a sulfur content of 31%. Analysis suggests this is likely due to the key role played by water in promoting sulfur melting and slag washing during the nickel anode slime desulfurization process.

[0064] Example 3 This embodiment adopts Figure 1The system shown treats nickel anode slime and includes: 1t / h of nickel anode mud (containing Ni 2.3%, Cu 1.0%, S 85%, Au 24g / t, Pt 19g / t, Pd The slurry is fed into a primary sulfur melting vessel 2 and steam is introduced into the vessel for primary hydraulic sulfur melting. The temperature is controlled at 135°C for 40 min. The molten material is fed into a first coarse filtration device 3 and a first fine filtration device 4 for primary coarse filtration and fine filtration. The produced liquid sulfur is fed into a cooling vessel 8 and cooled to a solid state. The sulfur product is produced through liquid-solid separation in a liquid-solid separation vessel 9. The produced primary desulfurization anode mud is fed into a secondary sulfur melting vessel 5. Water or liquid sulfur is added to the cooling vessel 8 and the partial aqueous solution obtained after solid-liquid separation is obtained. Steam is then introduced into the vessel for secondary hydraulic sulfur melting. The temperature is controlled at 135°C for 40 min. The molten material is fed into a second coarse filtration device 6 and a second fine filtration device 7 for secondary coarse filtration and fine filtration. The produced liquid sulfur is fed into a cooling vessel 8 and cooled to a solid state. The sulfur product is produced through solid-liquid separation in a liquid-solid separation vessel 9. The total output of sulfur products (containing 99.5% S) is 0.84t / h. The calculated sulfur recovery rate is 98.8%, and 0.16t / h of secondary desulfurization anode mud (Ni 11.5%, Cu 6.3%, S 6.3%, Au 150g / t, Pt 119g / t, Pd 175g / t) is produced.

[0065] Example 4 This embodiment adopts Figure 1 The system shown treats nickel anode slime and includes: 1t / h of nickel anode mud (containing Ni 2.1%, Cu 0.9%, S 88%, Au 23g / t, Pt 18g / t, Pd The slurry is fed into a primary sulfur melting vessel 2 and steam is introduced into the vessel for primary hydraulic sulfur melting. The temperature is controlled at 140°C for 50 min. The molten material is fed into a first coarse filtration device 3 and a first fine filtration device 4 for primary coarse filtration and fine filtration. The produced liquid sulfur is fed into a cooling vessel 8 and cooled to a solid state. The sulfur product is produced through liquid-solid separation in a liquid-solid separation vessel 9. The produced primary desulfurized anode mud is fed into a secondary sulfur melting vessel 5. Water or liquid sulfur is added to the cooling vessel 8 and the partial aqueous solution obtained after solid-liquid separation is obtained. Steam is then introduced into the vessel for secondary hydraulic sulfur melting. The temperature is controlled at 140°C for 50 min. The molten material is fed into a second coarse filtration device 6 and a second fine filtration device 7 for secondary coarse filtration and fine filtration. The produced liquid sulfur is fed into a cooling vessel 8 and cooled to a solid state. The sulfur product is produced through solid-liquid separation in a liquid-solid separation vessel 9. The total output of sulfur products (containing 99.5% S) is 0.87t / h, the calculated sulfur recovery rate is 98.8%, and 0.13t / h of secondary desulfurization anode mud (Ni12.9%, Cu6.9%, S7.7%, Au177g / t, Pt138g / t, Pd200g / t) is produced.

[0066] In the above embodiments and comparative examples, the total amount of water and aqueous solution added to the secondary sulfur melting vessel was determined according to a liquid-to-solid ratio of 0.4-0.8:1 mL / g.

[0067] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A system for treating nickel anode slime using a hydraulic method, characterized in that: It includes a slurry making tank, a primary sulfur melting container, a first filtering unit connected in sequence, and a secondary sulfur melting container, a second filtering unit connected in sequence; The primary sulfur melting container and the secondary sulfur melting container are both provided with a feed port, an air inlet and a discharge port, and the air inlets of the primary sulfur melting container and the secondary sulfur melting container are both connected to a steam supply mechanism; The first filter unit and the second filter unit are both provided with a feed end, a liquid discharge end and a solid discharge end; The feed port of the primary sulfur melting container is connected to the discharge port of the slurry making tank, and the discharge port is connected to the feed end of the first filter unit; The feed port of the secondary sulfur melting container receives the material from the solid discharge end of the first filter unit, and the discharge port is connected to the feed end of the second filter unit.

2. The system for treating nickel anode slime by hydraulic method according to claim 1, characterized in that: The system further includes a cooling container, which is provided with a feed port, a cooling medium inlet, and a discharge port, wherein the feed port is connected to the liquid discharge end of the first filter unit and the liquid discharge end of the second filter unit respectively; The system further comprises a liquid-solid separation tank connected to the discharge port of the cooling container; The secondary sulfur melting container is also provided with a liquid inlet.

3. The system for treating nickel anode slime by hydraulic method according to claim 1, characterized in that: The first filter unit includes a first coarse filter device and a first fine filter device connected in sequence; The second filter unit includes a second coarse filter device and a second fine filter device connected in sequence; The first coarse filtration device, the second coarse filtration device, the first fine filtration device, and the second fine filtration device are all provided with a feed inlet, a liquid discharge port, and a solid discharge port; The feed port of the first coarse filtration device is connected to the discharge port of the primary sulfur melting container, and the solid discharge port of the first coarse filtration device is connected to the feed port of the first fine filtration device; The feed port of the second coarse filtering device is connected to the discharge port of the secondary sulfur melting container, and the solid discharge port of the second coarse filtering device is connected to the feed port of the second fine filtering device.

4. The system for treating nickel anode slime by hydraulic pressure method according to claim 3, characterized in that: The filter chambers of the first coarse filtration device and the second coarse filtration device are provided with stirring paddles, which are used to scrape off solid materials on the inner wall of the filter chamber; the stirring paddles can be single-layer stirring paddles or multi-layer stirring paddles; The first fine filtration device and the second fine filtration device are mechanical filter press equipment; the mechanical filter press equipment is a screw extruder.

5. A method for treating nickel anode slime by hydraulic pressure, characterized in that: The method of treating nickel anode slime using the system according to any one of claims 1 to 4 comprises: Mixing nickel anode mud and water to prepare a first slurry; The first slurry is fed into a primary sulfur melting container, and steam is introduced into the primary sulfur melting container to heat the slurry, thereby performing a primary hydraulic sulfur melting; The pressurized material obtained by the primary hydraulic sulfur melting is first filtered to obtain a liquid sulfur solution and primary desulfurization slag; Adding primary desulfurization slag, water and / or returned aqueous solution into a secondary sulfur melting vessel, and introducing steam to heat the obtained second slurry to perform secondary hydraulic sulfur melting; The pressurized material obtained from the secondary hydraulic sulfur melting is filtered for the second time to obtain liquid sulfur solution and secondary desulfurization slag.

6. The method for treating nickel anode slime by hydraulic pressure method according to claim 5, characterized in that: The obtained liquid sulfur solution is water-cooled and solid-liquid separated to obtain sulfur and aqueous solution; At least a portion of the aqueous solution is returned to prepare a slurry with nickel anode mud and / or primary desulfurization slag; The obtained secondary desulfurization slag is used to extract precious metals and valuable metals.

7. The method for treating nickel anode slime by hydraulic pressure method according to claim 5, characterized in that: The liquid-to-solid ratio of the first slurry is 0.6-1:1 mL / g.

8. The method for treating nickel anode slime by hydraulic pressure method according to claim 5, characterized in that: The temperature of the first hydraulic sulfur melting process is 130-150°C, and the duration of the first hydraulic sulfur melting process is 30-50 minutes; The temperature of the secondary water pressure sulfur melting is 130~150°C, and the duration of the secondary water pressure sulfur melting is 30~50min.

9. The method for treating nickel anode slime by hydraulic pressure method according to claim 5, characterized in that: The liquid-to-solid ratio of the second slurry is 0.4-0.8:1 mL / g.

10. The method for treating nickel anode slime by hydraulic pressure method according to claim 5, characterized in that: The first filtration includes a first coarse filtration and a first fine filtration in succession; the second filtration includes a second coarse filtration and a second fine filtration in succession.

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