Nickel-cobalt leaching treatment system

Abstract

The utility model discloses a nickel-cobalt leaching treatment system, which relates to the technical field of non-ferrous metal hydrometallurgy and comprises a raw material pretreatment unit, a first leaching unit, a second leaching unit and a leachate impurity removal unit. According to the nickel-cobalt leaching treatment system, slurrying treatment of a nickel-cobalt intermediate product is conducted through the raw material pretreatment unit, two-stage leaching is achieved through the first leaching unit and the second leaching unit, neutralization and value adjustment are conducted through the leaching liquid impurity removal unit, and finally first impurity removal liquid is transferred to an external extraction system to be treated. The raw material pretreatment unit is connected with the first leaching unit and the leachate impurity removal unit, nickel-cobalt intermediate product slurry is used for raw material reaction and value adjustment of the leachate impurity removal unit, in addition, part of second leachate of the second leaching unit returns to the first leaching unit to be used as a leaching base solution, and second impurity removal liquid is merged into the leachate impurity removal unit to continue impurity removal; according to the system, through resource recycling, the nickel-cobalt leaching rate is increased, the consumption of auxiliary materials is reduced, introduction of impurities is reduced, and expansion of water flux is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of nonferrous metal hydrometallurgy, in particular to a nickel-cobalt leaching treatment system. Background Art

[0002] Ternary precursors are key raw materials for the preparation of ternary positive electrode materials and are often used to prepare ternary power batteries. In the preparation process of ternary precursors, nickel sulfate and cobalt sulfate are important raw materials for synthesizing ternary precursors. Nickel-cobalt intermediates can be obtained from laterite nickel ore through a hydrometallurgical process. The dry-basis nickel content of nickel-cobalt intermediates is as high as 30% to 50%, the cobalt content is 1% to 5%, and the manganese content is 3% to 20%. It is currently the main raw material for the production of nickel sulfate, cobalt sulfate and other products.

[0003] At present, the common methods for preparing sulfate products using nickel-cobalt intermediates include atmospheric leaching, pressure leaching and ammonia leaching, among which atmospheric leaching is widely used in production. However, the existing atmospheric leaching method has the disadvantages of low nickel-cobalt leaching rate, large amount of slag produced by leaching, and large water flux, resulting in a large pressure in the back-end processing of the leaching process, which is easy to affect the overall production efficiency. Moreover, in the existing atmospheric leaching method, the leachate is usually neutralized and adjusted by adding alkaline substances, which will lead to a large consumption of alkali in the entire leaching process, resulting in an increase in production costs. At the same time, the addition of alkaline substances will introduce a large amount of impurity elements, which will further increase the pressure of extraction and impurity removal and evaporation crystallization at the back end of the process, resulting in increased difficulty in washing slag and extraction and impurity removal, resulting in a situation where water flux expansion is very likely to occur, resulting in an increase in the amount of wastewater in the entire leaching system, and an increase in the cost of treated wastewater. At the same time, the loss of valuable metals entrained in the wastewater will also cause economic losses. Utility Model Content

[0004] The utility model aims to provide a nickel-cobalt leaching treatment system, which can continuously and efficiently leach nickel and cobalt by recycling water resources, thereby improving the nickel-cobalt leaching rate, so as to solve the problems of large consumption of auxiliary material alkali in the existing leaching system, introduction of impurity metal elements into the system, expansion of water flux, and high processing pressure at the back end of the process.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A nickel-cobalt leaching treatment system comprises a raw material pretreatment unit, a first leaching unit, a second leaching unit, and a leaching liquid impurity removal unit, wherein:

[0007] The raw material pretreatment unit is configured to be able to perform slurry treatment on the raw material, and the outlet of the raw material pretreatment unit is connected to the inlet of the first leaching unit and the inlet of the leachate impurity removal unit to transport the slurried raw material to the first leaching unit and the leachate impurity removal unit;

[0008] The first leaching unit is configured to perform a first acid leaching treatment to produce at least a first leaching filtrate and a first leaching residue; and

[0009] The outlet of the first leaching unit is connected to the inlet of the second leaching unit and the inlet of the leachate impurity removal unit to transport the first leaching residue to the second leaching unit and to transport the first leaching filtrate to the leachate impurity removal unit;

[0010] The second leaching unit is configured to be capable of performing a second acid leaching treatment to produce at least a second leaching filtrate, and capable of performing a post-second acid leaching impurity removal treatment to produce at least a second impurity removal filtrate; and,

[0011] The outlet of the second leaching unit is connected to the inlet of the first leaching unit and the inlet of the leachate impurity removal unit to transport the second leaching filtrate to the first leaching unit, and to transport the second impurity-removed filtrate to the leachate impurity removal unit;

[0012] The leachate impurity removal unit is configured to perform impurity removal treatment to produce at least a first impurity-removed filter residue and a first impurity-removed filtrate; and

[0013] The outlet of the leachate impurity removal unit is connected to the first leaching unit, and the impurity-removed filter residue is transported to the first leaching unit.

[0014] In some embodiments, the raw material pretreatment unit includes a pretreatment chamber, and a stirring device is provided in the pretreatment chamber to stir and slurry the raw material.

[0015] In some embodiments, the first leaching unit includes a first leaching chamber and a first leaching filter press, wherein:

[0016] The first leaching chamber is used for a first leaching process, and a stirring device is provided in the first leaching chamber to mix the material in the first leaching chamber;

[0017] The inlet of the first leaching filter press is connected to the outlet of the first leaching chamber, receives the slurry produced by the first leaching chamber, and performs filtration to generate the first leaching filtrate and the first leaching residue;

[0018] The outlet of the first leaching filter press is connected to the inlet of the second leaching unit and the inlet of the leachate impurity removal unit to transport the first leaching residue to the second leaching unit and to transport the first leaching filtrate to the leachate impurity removal unit.

[0019] In some embodiments, there are multiple first leaching chambers, and the multiple first leaching chambers are connected by overflow, so that the slurried raw materials flow through the multiple first leaching chambers in sequence.

[0020] In some embodiments, the second leaching unit includes a second leaching chamber and a second leaching filter press, wherein:

[0021] The second leaching chamber is used for performing a second leaching process, and a stirring device is provided in the second leaching chamber to mix the material in the second leaching chamber;

[0022] The inlet of the second leaching filter press is connected to the outlet of the second leaching chamber to receive the slurry produced by the second leaching chamber and filter press to generate the second leaching filtrate and the second leaching residue.

[0023] In some embodiments, the second leaching unit further includes a second leaching liquid receiving chamber, a second impurity removal chamber, and a second impurity removal filter press, wherein:

[0024] The inlet of the second leachate receiving chamber is connected to the outlet of the second leach filter press to receive the second leachate;

[0025] The outlet of the second leaching liquid receiving chamber is connected to the inlet of the second impurity removal chamber and the inlet of the first leaching unit to transport the second leaching filtrate to the second impurity removal chamber and the first leaching unit;

[0026] The second impurity removal chamber is provided with a stirring device to mix the materials in the second impurity removal chamber; and the outlet of the second impurity removal chamber is connected to the inlet of the second impurity removal filter press.

[0027] The second impurity removal filter press is used for filtering to generate a second impurity removal filtrate and a second impurity removal filter residue; and the outlet of the second impurity removal filter press is connected to the inlet of the leachate impurity removal unit to transport the second impurity removal filtrate to the leachate impurity removal unit.

[0028] In some embodiments, the leachate impurity removal unit comprises a first impurity removal chamber and a first impurity removal filter press, wherein:

[0029] The first impurity removal chamber is used to receive the material entering the leachate impurity removal unit and perform impurity removal and value adjustment on the material; and a stirring device is provided in the first impurity removal chamber to mix the material in the first impurity removal chamber;

[0030] The inlet of the first impurity-removing filter press is connected to the outlet of the first impurity-removing chamber to generate the first impurity-removing filter residue and the first impurity-removing filtrate by filter pressing.

[0031] In some embodiments, there are multiple first impurity removal chambers, and the multiple first impurity removal chambers are overflow-connected in sequence.

[0032] In some embodiments, the leachate impurity removal unit further includes a first impurity removal slag pulping chamber and a first impurity removal liquid receiving chamber, wherein:

[0033] The inlet of the first impurity-removing slurry making chamber is connected to the outlet of the first impurity-removing filter press to receive the first impurity-removing filter residue; and the outlet of the first impurity-removing slurry making chamber is connected to the inlet of the first leaching unit to transport the slurry prepared by the first impurity-removing filter residue to the first leaching unit;

[0034] The inlet of the first impurity removal liquid receiving chamber is connected to the outlet of the first impurity removal filter press to receive the first impurity removal filtrate; and the outlet of the first impurity removal liquid receiving chamber is connected to the extraction system to transport the first impurity removal filtrate to the extraction system.

[0035] In some embodiments, a stirring device is disposed in the first impurity removal slurrying chamber to slurry the material in the first impurity removal slurrying chamber.

[0036] Compared with the prior art, the nickel-cobalt leaching treatment system implemented by the utility model has the following beneficial effects:

[0037] The nickel-cobalt leaching treatment system connects the outlet of the raw material pretreatment unit to the inlet of the first leaching unit and the inlet of the leachate impurity removal unit, so that the nickel-cobalt intermediate product slurry prepared by the raw material pretreatment unit is not only used as a raw material reaction, but also used for the first leachate value adjustment of the leachate impurity removal unit, so that while achieving the value adjustment effect, it can also reduce the consumption of other auxiliary materials, reduce the auxiliary material consumption cost of the entire leaching treatment link, and also reduce the introduction of other impurity elements into the leaching treatment system. Moreover, the first impurity removal slag produced based on impurity removal is mostly unleached nickel-cobalt intermediates, and the nickel, cobalt and manganese are relatively high. The nickel-cobalt leaching treatment system returns the first impurity removal slag to the first leaching unit for continued leaching, thereby reducing the pressure of handling slag at the back end of the leaching treatment link, and then reducing the subsequent leaching treatment costs.

[0038] Moreover, the nickel-cobalt leaching treatment system returns part of the second leachate in the second leaching unit to the first leaching unit as the leaching bottom liquid of the first leaching unit, which can not only reduce the flux expansion of water in the leaching treatment link, but also reduce the acid consumption of the first leaching unit and reduce the cost of sulfuric acid consumption, while the remaining second leachate of the second leaching unit continues to remove impurities, ensuring that impurities such as iron, aluminum, and copper in the solution can be precipitated into the second impurity removal slag, and the second impurity removal slag is washed and discharged to open the way, so as to achieve the purpose of impurity removal. In addition, the second leaching filtrate is neutralized and adjusted to obtain the second impurity removal filtrate, which is relatively pure and has a relatively high solution pH, but the Ni and Co concentrations are relatively low. This part of the second impurity removal filtrate is added to the leaching liquid impurity removal unit to increase the pH value of the second impurity removal filtrate, thereby reducing the alkali consumption in the leaching link.

[0039] In addition, the nickel-cobalt leaching treatment system realizes a two-stage leaching process through the first leaching unit and the second leaching unit, which can not only improve the nickel-cobalt leaching rate, but also reduce the consumption of sulfuric acid, thereby greatly reducing the production cost of the nickel-cobalt leaching treatment. Moreover, the nickel-cobalt leaching treatment system adopts multi-stage slurry treatment, multi-stage continuous overflow leaching and continuous impurity removal device, which can effectively improve the leaching efficiency and facilitate production control. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of a nickel-cobalt leaching treatment system in an embodiment of the utility model;

[0041] Figure 2 It is a schematic diagram of a raw material pretreatment unit in an embodiment of the utility model;

[0042] Figure 3 is a schematic diagram of the first leaching unit in an embodiment of the utility model;

[0043] Figure 4 is a schematic diagram of the second leaching unit in an embodiment of the utility model;

[0044] Figure 5 It is a schematic diagram of the leachate impurity removal unit in the embodiment of the utility model.

[0045] In the figure, 100, a nickel-cobalt leaching treatment system;

[0046] 1. Raw material pretreatment unit; 10. Pretreatment chamber; 11. Pretreatment delivery pump;

[0047] 2. First leaching unit; 20. First leaching chamber; 21. First leaching filter press; 22. First leaching residue pulping chamber; 23. First leaching liquid receiving chamber;

[0048] 3. Second leaching unit; 30. Second leaching chamber; 31. Second leaching filter press; 32. Second leaching liquid receiving chamber; 33. Second impurity removal chamber; 34. Second impurity removal filter press; 35. Second impurity removal liquid receiving chamber;

[0049] 4. Leachate impurity removal unit; 40. First impurity removal chamber; 41. First impurity removal filter press; 42. First impurity removal slag pulping chamber; 43. First impurity removal liquid receiving chamber;

[0050] 5. Stirring device. DETAILED DESCRIPTION

[0051] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0052] In the description of the present utility model, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0053] In the description of the present invention, it should be understood that the terms "height", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] In the description of the present invention, it should be understood that the terms "first" and "second" are used in the present invention for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0055] refer to Figure 1-5The embodiment of the utility model provides a nickel-cobalt leaching treatment system 100, which includes a raw material pretreatment unit 1, a first leaching unit 2, a second leaching unit 3, and a leachate impurity removal unit 4, wherein the raw material pretreatment unit 1, the first leaching unit 2, the second leaching unit 3 and the leachate impurity removal unit 4 are connected in sequence, so that the raw material is slurried by the raw material pretreatment unit 1, enters the first leaching unit 2 for a first acid leaching treatment, and then enters the second leaching unit 3 for a second acid leaching treatment, and then enters the leachate impurity removal unit 4 for impurity removal and filtration.

[0056] In this embodiment, the raw material pretreatment unit 1 is configured to be able to perform slurry treatment on the raw material. As an example of the present utility model, the raw material pretreatment unit 1 includes two pretreatment chambers 10, which are arranged side by side and can respectively introduce raw materials for treatment, and a stirring device 5 is provided in each of the two pretreatment chambers 10 to stir and slurry the raw material.

[0057] It is understandable that the pretreatment chamber 10 is a container for accommodating raw materials and slurrying the raw materials. The pretreatment chamber 10 can be arranged inside a tank, a shell, a barrel, or the like. Any structure that has a space inside that can accommodate the raw materials and slurry the raw materials can be used as the pretreatment chamber 10.

[0058] refer to Figure 2 The outlets of the two pretreatment chambers 10 are connected to the same pipeline, and the pipeline is provided with a pretreatment delivery pump 11. The slurried raw material is delivered to subsequent processing units, such as the first leaching unit 2 and the leachate impurity removal unit 4, through the pretreatment delivery pump 11, so that the slurried raw material enters the first leaching unit 2 and the leachate impurity removal unit 4 respectively for subsequent processing.

[0059] refer to Figure 3 In this embodiment, the first leaching unit 2 is configured to perform a first acid leaching treatment to produce a first leaching filtrate and a first leaching residue. The pH value of the first acid leaching treatment of the first leaching unit 2 can be determined according to the process parameters set in the leaching treatment process. As an example of the present invention, the first leaching unit 2 includes three first leaching chambers 20 and a first leaching filter press 21, wherein:

[0060] The first leaching chamber 20 is used for the first acid leaching treatment. The three first leaching chambers 20 are connected in sequence through overflow pipes, so that the material can pass through the three first leaching chambers 20 in sequence through the overflow pipes, thereby realizing the overflow connection of multiple first leaching chambers 20. In addition, a stirring device 5 is provided in each first leaching chamber 20 to fully mix the material in each first leaching chamber 20 and accelerate the reaction rate for subsequent treatment.

[0061] The inlet of the first leaching filter press 21 is connected to the outlet of the first leaching chamber 20 through the first leaching delivery pump to receive the slurry generated by the first leaching chamber 20 and filter press to generate the first leaching filtrate and the first leaching residue. The structure of the first leaching filter press 21 can be selected according to the process parameters set by the leaching treatment process, such as a plate and frame filter press, a chamber filter press, a vertical filter press or a belt filter press.

[0062] The outlet of the first leaching filter press 21 is respectively provided with a first leaching residue pulping chamber 22 and a first leaching liquid receiving chamber 23 according to the first leaching residue and the first leaching filtrate produced by the filtration.

[0063] The first leaching residue pulping chamber 22 is used to receive the first leaching residue and prepare the first leaching residue into slurry. As an example of the present invention, the first leaching residue pulping chamber 22 is provided with a stirring device 5 to slurry the first leaching residue; the outlet of the first leaching residue pulping chamber 22 is connected to the inlet of the second leaching unit 3 to transport the slurry prepared from the first leaching residue to the second leaching unit 3;

[0064] The first leachate receiving chamber 23 is used to temporarily store the first leachate filtrate. In the subsequent processing link, the first leachate filtrate is transported to the leachate impurity removal unit 4 by a pump.

[0065] It can be understood that the first leaching chamber 20 is a container for containing materials and performing acid leaching treatment on the materials. Similar to the pretreatment chamber 10, the first leaching chamber 20 can also be arranged inside a structure such as a tank body, a shell body, a barrel body, etc. As long as there is a space inside the corresponding structure that can contain materials and perform acid leaching treatment on the materials, it can be used as the first leaching chamber 20.

[0066] refer to Figure 4 In this embodiment, the second leaching unit 3 is configured to be able to perform a second acid leaching treatment to produce a second leaching filtrate and a second leaching residue. The pH value of the second acid leaching treatment of the second leaching unit 3 is lower than the pH value of the first acid leaching treatment of the first leaching unit 2, which can be specifically determined according to the process parameters set for the leaching treatment process. As an example of the present utility model, the second leaching unit 3 includes a second leaching chamber 30, a second leaching filter press 31, a second leaching liquid receiving chamber 32, a second impurity removal chamber 33, a second impurity removal filter press 34 and a second impurity removal liquid receiving chamber 35.

[0067] The inlet of the second leaching chamber 30 is connected to the outlet of the first leaching residue pulping chamber 22, and is used to receive the slurry prepared by the first leaching residue and perform a second acid leaching treatment. As an example of the present invention, a stirring device 5 is provided in the second leaching chamber 30 to fully mix the materials in the second leaching chamber 30.

[0068] The inlet of the second leaching filter press 31 is connected to the outlet of the second leaching chamber 30. After the material subjected to the second acid leaching treatment is transported to the second leaching filter press 31 by a pump, it is filtered through the second leaching filter press 31 to form a second leaching filtrate and a second leaching residue. Similar to the first leaching filter press 21, the structure of the second leaching filter press 31 can be selected according to the process parameters set by the leaching treatment process, such as a plate and frame filter press, a chamber filter press, a vertical filter press or a belt filter press.

[0069] After the secondary acid leaching treatment, filtration and washing, the dry basis nickel and cobalt content of the second leaching residue is less than 1%, and the manganese content is greater than 50%. Therefore, the second leaching residue can leave the nickel-cobalt leaching treatment system 100 and be recycled separately.

[0070] The second leaching filtrate is transported to the second leaching liquid receiving chamber 32 via the outlet of the second leaching filter press 31. The second leaching liquid receiving chamber 32 receives the second leaching filtrate, and the outlet of the second leaching liquid receiving chamber 32 is connected in parallel to the inlet of the second impurity removal chamber 33 and the inlet of the first first leaching chamber 20 of the first leaching unit 2. The second leaching filtrate is transported to the second impurity removal chamber 33 and the first leaching unit 2 respectively through the parallel branch arranged at the outlet of the second leaching liquid receiving chamber 32.

[0071] A stirring device 5 is provided in the second impurity removal chamber 33, and the outlet of the second impurity removal chamber 33 is connected to the inlet of the second impurity removal filter press 34, so that the second leaching filtrate is filtered through the second impurity removal filter press 34 to generate a second impurity removal filtrate and a second impurity removal filter residue. After the second impurity removal filter residue is washed and qualified, it can be separated from the nickel-cobalt leaching treatment system 100 and recycled separately.

[0072] The second impurity-removing filtrate is transported to the second impurity-removing liquid receiving chamber 35 for temporary storage via the outlet of the second impurity-removing filter press 34. According to the process steps of the leaching treatment, the second impurity-removing filtrate stored in the second impurity-removing liquid receiving chamber 35 is transported to the leachate impurity-removing unit 4 by the pump, and enters the inlet of the first first impurity-removing chamber 40 of the leachate impurity-removing unit 4. The impurity-removing treatment is continued.

[0073] It can be understood that, in the second leaching unit 3, the second leaching chamber 30, the second leaching liquid receiving chamber 32, the second impurity removal chamber 33, and the second impurity removal liquid receiving chamber 35 can also be arranged inside structures such as a tank body, a shell body, and a barrel body, and it is only necessary to have a space inside the corresponding structure that can accommodate materials and perform corresponding processing on the materials.

[0074] refer to Figure 5In this embodiment, the leachate impurity removal unit 4 is configured to be capable of performing impurity removal treatment to produce a first impurity removal filter residue and a first impurity removal filtrate. As an example of the present utility model, the leachate impurity removal unit 4 includes a first impurity removal chamber 40, a first impurity removal filter press 41, a first impurity removal residue pulping chamber 42 and a first impurity removal liquid receiving chamber 43, wherein:

[0075] There are two first impurity removal chambers 40, which are connected in sequence by overflow, and are used to receive the materials entering the leachate impurity removal unit 4 and perform impurity removal reaction. In addition, a stirring device 5 is provided in the first impurity removal chamber 40 to fully mix the materials in the first impurity removal chamber 40.

[0076] The inlet of the first impurity removal filter press 41 is connected to the outlet of the second first impurity removal chamber 40 to generate the first impurity removal filter residue and the first impurity removal filtrate by filtration. Similar to the first leaching filter press 21, the structure of the first impurity removal filter press 41 can also be selected according to the process parameters set by the leaching treatment process, such as a plate and frame filter press, a chamber filter press, a vertical filter press or a belt filter press.

[0077] After being filtered by the first impurity removal filter press 41, the first impurity removal filter residue and the first impurity removal filtrate are discharged from the outlet of the first impurity removal filter press 41. According to the difference between the first impurity removal filter residue and the first impurity removal filtrate, the outlet of the first impurity removal filter press 41 is connected to the first impurity removal residue pulping chamber 42 and the first impurity removal liquid receiving chamber 43, respectively, wherein:

[0078] The first impurity-removing residue pulping chamber 42 receives the first impurity-removing filter residue, and a stirring device 5 is provided in the first impurity-removing residue pulping chamber 42 to pulp the first impurity-removing filter residue in the first impurity-removing residue pulping chamber 42; the outlet of the first impurity-removing residue pulping chamber 42 is connected to the inlet of the first first leaching chamber 20 of the first leaching unit 2 to transport the slurry prepared from the first impurity-removing filter residue to the first leaching unit 2;

[0079] The first impurity removal liquid receiving chamber 43 receives the first impurity removal filtrate to temporarily store the first impurity removal filtrate; and the outlet of the first impurity removal liquid receiving chamber 43 is connected to the extraction system. According to the steps of the leaching treatment, the first impurity removal liquid receiving chamber 43 transports the first impurity removal filtrate to the extraction system through a pump to extract the first impurity removal filtrate.

[0080] Based on the aforementioned connection design, the processing flow of the nickel-cobalt leaching treatment system 100 is as follows:

[0081] The nickel-cobalt intermediate raw material is fed into the pretreatment chamber 10 of the raw material pretreatment unit 1, and after being stirred and slurried by the stirring device 5 in the two pretreatment chambers 10, it is transported to the first leaching unit 2 through the pretreatment delivery pump 11. The solid-liquid ratio used in the stirring and slurrying process can be set according to the process parameters of the raw material processing.

[0082] First, the first first leaching chamber 20 of the first leaching unit 2 receives the second leaching filtrate from the second leaching unit 3 as the leaching bottom liquid, and then the slurried nickel-cobalt intermediate product in the raw material pretreatment unit 1 and the slurried first impurity-removing filter residue in the first impurity-removing filter residue slurry chamber 42 are transported to the first first leaching chamber 20 of the first leaching unit 2 by a pump, so that the material is subjected to the first acid leaching treatment in the first leaching chamber 20. In this way, the second leaching filtrate and the first impurity-removing filter residue can adjust the pH value of the slurried nickel-cobalt intermediate product to reduce the amount of acid and alkali required for the adjustment.

[0083] When the material is subjected to the first acid leaching treatment in the first leaching chamber 20, the pH value at the leaching end point, the reaction temperature of the acid leaching, the reaction time and the stirring speed of the stirring device 5 can be set according to the process parameters of the leaching process so that the intermediate product obtained after the first acid leaching treatment meets the requirements of subsequent treatment.

[0084] In the first leaching unit 2, under the action of the overflow pipe, the material in the first first leaching chamber 20 will gradually flow to the first leaching chamber 20 at the end, so that the material can undergo a tertiary reaction in the first leaching unit 2, and is stirred by the stirring device 5 in each leaching chamber. After the tertiary reaction, the slurry enters the first leaching filter press 21, and is filtered by the first leaching filter press 21 to obtain the first leaching filtrate and the first leaching residue. The first leaching filtrate is temporarily stored in the first leaching liquid receiving chamber 23, and the first leaching residue is transported to the first leaching residue pulping chamber 22 for pulping.

[0085] After the first leaching residue is slurried, it is transported to the second leaching unit 3 for further leaching, and the second acid leaching treatment is performed in the second leaching chamber 30. When the material is subjected to the second acid leaching treatment in the second leaching chamber 30, the pH of the leaching end point, the reaction temperature of the acid leaching, the reaction time, and the stirring speed of the stirring device 5 can be set according to the process parameters of the leaching treatment process. It is only necessary to make the pH value of the second acid leaching treatment lower than the pH value of the first acid leaching treatment in the first leaching unit 2, so that the first leaching unit 2 and the second leaching unit 3 can achieve low acid treatment and high acid treatment, and ensure that the intermediate product obtained after the second acid leaching treatment meets the requirements of subsequent treatment.

[0086] After the slurry reacts in the second leaching chamber 30, it enters the second leaching filter press 31, and is filtered by the second leaching filter press 31 to obtain the second leaching filtrate and the second leaching residue. In this link, after the second leaching residue is washed, the total content of nickel and cobalt on a dry basis reaches less than 1%, and the manganese content is greater than 50%. Therefore, at this time, the second leaching residue can be separated from the nickel-cobalt leaching treatment system 100 and recycled separately.

[0087] After the second leaching filtrate is transported to the second leaching liquid receiving chamber 32 through the outlet of the second leaching filter press 31, part of the second leaching filtrate is returned to the inlet of the first first leaching chamber 20 of the first leaching unit 2 by means of a pump as the leaching bottom liquid for the first acid leaching treatment, and the rest of the second leaching filtrate is transported to the inlet of the second impurity removal chamber 33.

[0088] In the second impurity removal chamber 33, the second leaching filtrate is neutralized and adjusted with the added alkaline substance solution under preset process conditions. During the neutralization and adjustment process, the stirring device 5 in the second impurity removal chamber 33 fully mixes the second leaching filtrate with the solution of the added alkaline substance, and after the adjustment, the mixed solution enters the second impurity removal filter press 34 for filtration to obtain the second impurity removal filtrate and the second impurity removal filter residue.

[0089] In this step, after the second impurity-removing filter residue is washed, the total content of nickel, cobalt and manganese on a dry basis can be less than 1.5%. Therefore, at this time, the second impurity-removing filter residue can be separated from the nickel-cobalt leaching treatment system 100 and recycled separately.

[0090] The second impurity removal filtrate is transported to the first first impurity removal chamber 40 via the outlet of the second impurity removal filter press 34, and the first impurity removal chamber 40 receives the slurry raw material and the alkaline solution transported from the pretreatment chamber 10 to adjust the pH value of the second impurity removal leaching filtrate, and stirs with the stirring device 5 under the conditions of preset reaction temperature and reaction time, so that the material in the first impurity removal chamber 40 undergoes sufficient impurity removal reaction, and after the impurity removal reaction, it is transported to the first impurity removal filter press 41 for filtration.

[0091] After filtration by the first impurity removal filter press 41, the first impurity removal filter residue and the first impurity removal filtrate are produced and discharged from the outlet of the first impurity removal filter press 41. In this link, the first impurity removal filtrate is pumped to the first impurity removal slurry chamber 42 for temporary storage, and after the first impurity removal filtrate meets the component requirements, it is transferred to the external extraction system for deep impurity removal. The first impurity removal filter residue is transported to the impurity removal slurry chamber 42, stirred by the stirring device 5 in the first impurity removal slurry chamber 42, and after being prepared into slurry, it is transported to the entrance of the first first leaching chamber 20 to continue acid leaching the first impurity removal residue to achieve recycling.

[0092] In summary, the embodiment of the utility model provides a nickel-cobalt leaching treatment system 100, which connects the outlet of the raw material pretreatment unit 1 to the inlet of the first leaching unit 2 and the inlet of the leachate impurity removal unit 4, so that the nickel-cobalt intermediate product slurry prepared by the raw material pretreatment unit 1 is not only used as a raw material reaction, but also used for the leachate value adjustment of the leachate impurity removal unit 4. While achieving the value adjustment effect, it can also reduce the consumption of other auxiliary materials, reduce the auxiliary material consumption cost of the entire leaching treatment link, and reduce the introduction of other impurity elements into the leaching treatment system. Most of the first impurity removal slag produced by impurity removal is unleached nickel-cobalt intermediate, and the nickel, cobalt and manganese content is relatively high, so the first impurity removal slag can be returned to the first leaching unit 2 for continued leaching, thereby reducing the pressure of slag treatment at the back end of the leaching treatment link, and thus reducing subsequent treatment costs.

[0093] Moreover, the nickel-cobalt leaching treatment system 100 returns part of the second leaching filtrate in the second leaching unit 3 to the first leaching unit 2 as the leaching bottom liquid, which can not only reduce the flux expansion of water in the leaching treatment link, but also reduce the acid consumption of the first leaching unit 2, and reduce the cost of sulfuric acid consumption, while the remaining second leaching filtrate of the second leaching unit 3 continues to be impurity-removed, ensuring that impurities such as iron, aluminum, and copper in the solution can be precipitated into the second impurity-removing slag, and the second impurity-removing slag is washed and discharged to open the circuit, so as to achieve the purpose of impurity removal. In addition, the second leaching filtrate is neutralized and adjusted to obtain the second impurity-removing filtrate, which is relatively pure and has a relatively high solution pH, but the Ni and Co concentrations are relatively low. This part of the second impurity-removing filtrate is added to the leaching liquid impurity-removing unit 4, which can increase the pH of the second impurity-removing filtrate, thereby reducing the alkali consumption.

[0094] In addition, the nickel-cobalt leaching treatment system 100 realizes a two-stage leaching process through the first leaching unit 2 and the second leaching unit 3, which can not only improve the nickel-cobalt leaching rate, but also reduce the consumption of sulfuric acid, thereby greatly reducing the production cost of nickel-cobalt leaching treatment. Moreover, the nickel-cobalt leaching treatment system 100 adopts multi-stage slurry treatment, multi-stage continuous overflow leaching and continuous impurity removal device, which can effectively improve the leaching efficiency and facilitate production control.

[0095] 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 substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A nickel-cobalt leaching treatment system, characterized in that: It includes a raw material pretreatment unit, a first leaching unit, a second leaching unit, and a leaching liquid impurity removal unit, wherein: The raw material pretreatment unit is configured to be able to perform slurry treatment on the raw material, and the outlet of the raw material pretreatment unit is connected to the inlet of the first leaching unit and the inlet of the leachate impurity removal unit to transport the slurried raw material to the first leaching unit and the leachate impurity removal unit; The first leaching unit is configured to perform a first acid leaching treatment to produce at least a first leaching filtrate and a first leaching residue; and The outlet of the first leaching unit is connected to the inlet of the second leaching unit and the inlet of the leachate impurity removal unit to transport the first leaching residue to the second leaching unit and to transport the first leaching filtrate to the leachate impurity removal unit; The second leaching unit is configured to be capable of performing a second acid leaching treatment to produce at least a second leaching filtrate, and capable of performing a post-second acid leaching impurity removal treatment to produce at least a second impurity removal filtrate; and, The outlet of the second leaching unit is connected to the inlet of the first leaching unit and the inlet of the leachate impurity removal unit to transport the second leaching filtrate to the first leaching unit, and to transport the second impurity-removed filtrate to the leachate impurity removal unit; The leachate impurity removal unit is configured to perform impurity removal treatment to produce at least a first impurity-removed filter residue and a first impurity-removed filtrate; and The outlet of the leachate impurity removal unit is connected to the first leaching unit, and the impurity-removed filter residue is transported to the first leaching unit.

2. The nickel-cobalt leaching treatment system according to claim 1, characterized in that: The raw material pretreatment unit comprises a pretreatment chamber, and a stirring device is arranged in the pretreatment chamber to stir and slurry the raw materials.

3. The nickel-cobalt leaching treatment system according to claim 1, characterized in that: The first leaching unit comprises a first leaching chamber and a first leaching filter press, wherein: The first leaching chamber is used for a first leaching process, and a stirring device is provided in the first leaching chamber to mix the material in the first leaching chamber; The inlet of the first leaching filter press is connected to the outlet of the first leaching chamber, receives the slurry produced by the first leaching chamber, and performs filtration to generate the first leaching filtrate and the first leaching residue; The outlet of the first leaching filter press is connected to the inlet of the second leaching unit and the inlet of the leachate impurity removal unit to transport the first leaching residue to the second leaching unit and to transport the first leaching filtrate to the leachate impurity removal unit.

4. The nickel-cobalt leaching treatment system according to claim 3, characterized in that: There are multiple first leaching chambers, and the multiple first leaching chambers are overflow-connected, so that the slurried raw materials flow through the multiple first leaching chambers in sequence.

5. The nickel-cobalt leaching treatment system according to claim 1, characterized in that: The second leaching unit comprises a second leaching chamber and a second leaching filter press, wherein: The second leaching chamber is used for performing a second leaching process, and a stirring device is provided in the second leaching chamber to mix the material in the second leaching chamber; The inlet of the second leaching filter press is connected to the outlet of the second leaching chamber to receive the slurry produced by the second leaching chamber and filter press to generate the second leaching filtrate and the second leaching residue.

6. The nickel-cobalt leaching treatment system according to claim 5, characterized in that: The second leaching unit further includes a second leaching liquid receiving chamber, a second impurity removal chamber and a second impurity removal filter press, wherein: The inlet of the second leachate receiving chamber is connected to the outlet of the second leach filter press to receive the second leachate; The outlet of the second leaching liquid receiving chamber is connected to the inlet of the second impurity removal chamber and the inlet of the first leaching unit to transport the second leaching filtrate to the second impurity removal chamber and the first leaching unit; A stirring device is provided in the second impurity removal chamber to mix the materials in the second impurity removal chamber; and the outlet of the second impurity removal chamber is connected to the inlet of the second impurity removal filter press; The second impurity removal filter press is used for filtering to generate a second impurity removal filtrate and a second impurity removal filter residue; and the outlet of the second impurity removal filter press is connected to the inlet of the leachate impurity removal unit to transport the second impurity removal filtrate to the leachate impurity removal unit.

7. The nickel-cobalt leaching treatment system according to claim 1, characterized in that: The leachate impurity removal unit comprises a first impurity removal chamber and a first impurity removal filter press, wherein: The first impurity removal chamber is used to receive the material entering the leachate impurity removal unit and perform impurity removal and value adjustment on the material; and a stirring device is provided in the first impurity removal chamber to mix the material in the first impurity removal chamber; The inlet of the first impurity-removing filter press is connected to the outlet of the first impurity-removing chamber to generate the first impurity-removing filter residue and the first impurity-removing filtrate by filter pressing.

8. The nickel-cobalt leaching treatment system according to claim 7, characterized in that: There are multiple first impurity removal chambers, and the multiple first impurity removal chambers are overflow-connected in sequence.

9. The nickel-cobalt leaching treatment system according to claim 7, characterized in that: The leachate impurity removal unit also includes a first impurity removal slag pulping chamber and a first impurity removal liquid receiving chamber, wherein: The inlet of the first impurity-removing slurry making chamber is connected to the outlet of the first impurity-removing filter press to receive the first impurity-removing filter residue; and the outlet of the first impurity-removing slurry making chamber is connected to the inlet of the first leaching unit to transport the slurry prepared by the first impurity-removing filter residue to the first leaching unit; The inlet of the first impurity removal liquid receiving chamber is connected to the outlet of the first impurity removal filter press to receive the first impurity removal filtrate; and the outlet of the first impurity removal liquid receiving chamber is connected to the extraction system to transport the first impurity removal filtrate to the extraction system.

10. The nickel-cobalt leaching treatment system according to claim 9, characterized in that: A stirring device is arranged in the first impurity removal and slurry making chamber to slurry the material in the first impurity removal and slurry making chamber.

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