A high-nickel matte fine grinding pulping system and its usage method

Abstract

This invention relates to the field of high-nickel matte pulping technology, specifically disclosing a high-nickel matte fine grinding pulping system, including a horizontal ball mill, a spiral classifier, and a stirred fine mill. The horizontal ball mill is used for coarse crushing and grinding of the ore pulp; the stirred fine mill is used for fine grinding of the ore pulp; the spiral classifier is installed on one side of the horizontal ball mill, and the discharge port of the horizontal ball mill is connected to the feed port of the spiral classifier through a connecting pipe, and the return port of the spiral classifier is connected to the feed port of the horizontal ball mill. In this invention, the high-nickel matte fine grinding system can be used for coarse alloy particles with excellent toughness and ductility of 3-15mm, and can perform efficient and energy-saving crushing and grinding of this material; it solves the problem of poor grinding of alloys in general pulping processes, which leads to blockage of the discharge port and pipelines, and ensures smooth and stable operation during production.

Description

Technical Field

[0001] This invention relates to the field of high-nickel matte pulping technology, and specifically to a high-nickel matte fine grinding pulping system. Background Technology

[0002] High-grade nickel matte is the most economical raw material for producing nickel sulfate among nickel intermediates. However, due to the influence of raw material composition and smelting process, the nickel content in nickel sulfate varies greatly and the degree of blowing sulfidation is inconsistent. The content of nickel-iron alloy also varies greatly, making it difficult to economically and efficiently prepare ultra-fine high-concentration slurry for the production of battery-grade nickel sulfate.

[0003] Several technical challenges exist in this process: ① The raw materials contain high levels of nickel, cobalt, and iron, especially alloy particles of 3-15mm, which have excellent toughness and ductility, making them difficult to crush; ② The particle fineness of the slurry must meet the requirement of -280 mesh ≥90% to ensure the leaching rate and completion rate in nickel hydrometallurgy; ③ Strict requirements are placed on the stability of slurry concentration, particle size, and volume in subsequent wet nickel extraction, generally within 50% ± 2%, which is difficult to achieve with conventional wet ultrafine slurry preparation processes and equipment; ④ The alloy materials in high-nickel materials are easily crushed into thin flakes during crushing, clogging the discharge port and pipelines, hindering smooth production.

[0004] To address the aforementioned technical issues, there is an urgent need for a high-grade nickel matte fine grinding and pulping system and method specifically designed for the production of high-grade nickel matte ore pulp from nickel intermediates. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-nickel matte fine grinding pulping system.

[0006] The high-nickel matte fine grinding pulping system of the present invention includes a horizontal ball mill, a spiral classifier, and a stirred fine grinding mill. The horizontal ball mill is used for coarse crushing and grinding of ore slurry; the stirred fine grinding mill is used for fine grinding of ore slurry; the spiral classifier is installed on one side of the horizontal ball mill, and the discharge port of the horizontal ball mill is connected to the feed port of the spiral classifier through a connecting pipe, and the return port of the spiral classifier is connected to the feed port of the horizontal ball mill.

[0007] The discharge port of the spiral classifier is connected to a storage mechanism, which is connected to the feed port at the bottom of the stirred fine mill via a conduit.

[0008] The storage mechanism includes a first storage container and a second storage container. The first storage container is used to store the slurry discharged from the spiral classifier and to regulate the slurry level in the spiral classifier, thereby ensuring the stability of the slurry level in the grinding system and maintaining stable feeding of the stirred fine grinding mill.

[0009] The stirring mill includes a stirring container, the interior of which is divided into a grinding zone at the lower end and a settling zone at the upper end by a grading ring baffle.

[0010] A stirrer is installed in the center of the stirring fine grinding mill; the stirrer is equipped with a classifying wheel, which is located below the classifying ring baffle, and the diameter of the classifying wheel is larger than the inner diameter of the classifying ring baffle.

[0011] The stirred mill uses 10-30mm low-chromium or medium-chromium steel balls as media, and mixes them in an appropriate ratio to provide sufficient energy density to ensure that the discharge particle size of the stirred mill is ≥90% at -280 mesh.

[0012] The stirred fine grinding mill is designed with a frequency conversion control device, with an operating frequency of 30-50Hz and an edge linear velocity of 4-5m / s for the agitator, which meets the crushing force requirements for materials smaller than 1mm.

[0013] The second storage container is connected to the first storage container, and the height difference between the discharge port of the second storage container and the stirring mill is greater than 4m.

[0014] The horizontal ball mill has an automatic water volume adjustment function to ensure that the mass concentration of the slurry in the cylinder is stable in the range of 40% to 50%, and the output particle size is stable below -1mm, ensuring that the high-grade nickel matte slurry has good fluidity.

[0015] The horizontal ball mill equipment is equipped with 60mm-120mm low-chromium or medium-chromium steel balls as media, and is mixed in an appropriate proportion.

[0016] A method of using a high-nickel matte fine grinding pulping system:

[0017] S1. Input 1mm-15mm coarse-grained high-nickel matte raw material into the horizontal ball mill;

[0018] S2. After being ground by a horizontal ball mill, the coarse raw material is discharged into a spiral classifier for classification. The slurry with a particle size of less than 1 mm overflows from the spiral classifier into the first storage container, while the slurry with a particle size of more than 1 mm is returned to the horizontal ball mill for further grinding through the return port under the drive of the spiral blades of the spiral classifier.

[0019] S3. The slurry in the first storage container is transported to the second storage container. The slurry in the second storage container enters the grinding zone of the stirred mill from the feed port at the bottom of the stirred mill by gravity forced flow.

[0020] S4. The slurry located in the grinding zone of the stirred fine mill is further crushed by the rotation of the agitator and the steel ball media. Under the screening of the classifying wheel and the classifying ring baffle, it is discharged from the settling port located in the settling zone.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. In this invention, the high-nickel matte fine grinding system is suitable for coarse alloy particles with excellent toughness and ductility of 3-15mm, and can perform efficient and energy-saving grinding of the material; it solves the problem of the alloy not being easy to grind finely in general pulping process, which leads to blockage of discharge port and pipeline, and the production process is smooth and stable.

[0023] 2. In this invention, the slurry concentration, particle size, and volume of the high-grade nickel matte fine grinding system are very stable with minimal fluctuations, solving the problem of large fluctuations in general wet ultrafine slurry preparation; in this invention, the particle fineness of the high-grade nickel matte slurry output is ≥90% -280 mesh, solving the problem of ultrafine particles in the high-grade nickel matte slurry and effectively ensuring the leaching rate and leaching completion rate of nickel in the nickel hydrometallurgical system.

[0024] 3. In this invention, the stirred fine grinding mill is easy to operate, occupies a small area, has few easily damaged parts, and is easy to maintain. Its grinding efficiency is about 30% higher than that of a horizontal ball mill, saving approximately 30% to 50% of energy. In this invention, the overall energy consumption of the high-nickel matte fine grinding system is about 30% to 50% lower than that of a typical wet ultrafine pulping system, thus solving the high energy consumption problem in the high-nickel matte ultrafine grinding process. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the stirring fine grinding mill of the present invention.

[0028] In the diagram: 1. Horizontal ball mill; 2. Spiral classifier; 3. Stirred fine mill; 31. Grinding zone; 32. Settling zone; 33. Agitator; 34. Classifying wheel; 35. Classifying ring baffle; 36. Stirring container;

[0029] 4. First storage container; 5. Second storage container. Detailed Implementation

[0030] The following drawings will disclose several embodiments of the present invention. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the invention. That is, in some embodiments of the invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0031] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this invention.

[0032] Please see Figure 1 - Figure 2 The high-nickel matte fine grinding pulping system of the present invention includes a horizontal ball mill 1, a spiral classifier 2, and a stirred fine grinding mill 3. The horizontal ball mill 1 is used for coarse crushing and grinding of ore slurry; the stirred fine grinding mill 3 is used for fine grinding of ore slurry; the spiral classifier 2 is installed on one side of the horizontal ball mill 1, and the discharge port of the horizontal ball mill 1 is connected to the feed port of the spiral classifier 2 through a connecting pipe, and the return port of the spiral classifier 2 is connected to the feed port of the horizontal ball mill 1.

[0033] The discharge port of the spiral classifier 2 is connected to a storage mechanism, which is connected to the feed port at the bottom of the mixing mill 3 via a conduit.

[0034] The storage mechanism includes a first storage container 4 and a second storage container 5. The first storage container 4 is used to store the slurry discharged from the spiral classifier 2 and to regulate the slurry level in the spiral classifier 2, ensuring the stability of the slurry level in the grinding system and maintaining the stable feeding of the stirred fine grinding mill 3.

[0035] The stirred fine grinding mill 3 includes a stirring container 36, and the interior of the stirring container 36 is formed by a classifying ring baffle 35, which constitutes a grinding zone 31 at the lower end and a settling zone 32 at the upper end.

[0036] A stirrer 33 is installed in the center of the fine grinding mill 3; a classifying wheel 34 is provided on the stirrer 33, the classifying wheel 34 is located below the classifying ring baffle 35, and the diameter of the classifying wheel 34 is larger than the inner diameter of the classifying ring baffle 35, and the classifying wheel 34 has a gap of 3mm-10mm.

[0037] Specifically, the stirred grinding mill 3 uses 10mm-30mm low-chromium or medium-chromium steel balls as media, and mixes them in an appropriate ratio to provide sufficient energy density to ensure that the discharge particle size of the stirred grinding mill 3 is ≥90% at -280 mesh.

[0038] The mixing fine grinding mill 3 is designed with a frequency conversion control device, with an operating frequency of 30-50Hz. The edge linear velocity of the agitator 33 is 4-5m / s, which meets the crushing force requirements of materials below 1mm.

[0039] The second storage container 5 is connected to the first storage container 4, and the height difference between the discharge port of the second storage container 5 and the stirring mill 3 is greater than 4m, so that the slurry in the second storage container is transported into the stirring mill 3 by its own weight, avoiding slurry backflow.

[0040] The ball mill has an automatic water volume adjustment function to ensure that the mass concentration of the slurry in the cylinder is stable at 40% to 50% and the output particle size is stable at -1mm, ensuring that the high nickel matte slurry has good fluidity.

[0041] The ball grinding machine contains 60mm-120mm low-chromium or medium-chromium steel balls as media, mixed in an appropriate ratio.

[0042] A method of using a high-nickel matte fine grinding pulping system:

[0043] S1. Input 1mm-15mm coarse-grained high-nickel matte raw material into horizontal ball mill 1;

[0044] S2. After being ground by the horizontal ball mill 1, the coarse raw material is discharged into the spiral classifier 2 for classification. The slurry with a particle size of less than 1 mm overflows from the spiral classifier 2 into the first storage container 4, while the slurry with a particle size of more than 1 mm is driven by the spiral blades of the spiral classifier 2 and returned to the horizontal ball mill 1 through the return port for further grinding.

[0045] S3. The slurry in the first storage container 4 is transported to the second storage container 5. The slurry in the second storage container 5 enters the grinding zone 31 of the stirred fine mill 3 from the feed port at the bottom of the stirred fine mill 3 by gravity forced flow.

[0046] S4. The slurry located in the grinding zone 31 of the stirred fine mill 3 is further crushed by the rotation of the agitator 33 and the steel ball media. Under the screening of the classifying wheel 34 and the classifying ring baffle 35, it is discharged from the settling port located in the settling zone 32.

[0047] The above are merely embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A high-nickel matte fine grinding pulping system, comprising a horizontal ball mill (1), a spiral classifier (2), and a stirred fine grinding mill (3), characterized in that: The horizontal ball mill (1) is used for coarse crushing and grinding of ore slurry; the stirred fine mill (3) is used for fine grinding of ore slurry; the spiral classifier (2) is installed on one side of the horizontal ball mill (1), and the discharge port of the horizontal ball mill (1) is connected to the feed port of the spiral classifier (2) through a connecting pipe, and the return port of the spiral classifier (2) is connected to the feed port of the horizontal ball mill (1); the discharge port of the spiral classifier (2) is connected to a storage mechanism, and the storage mechanism is connected to the feed port at the bottom of the stirred fine mill (3) through a conduit; The storage mechanism includes a first storage container (4) and a second storage container (5). The first storage container (4) is used to store the slurry discharged from the spiral classifier (2) and to adjust the slurry level in the spiral classifier (2) to ensure the stability of the slurry level in the grinding system. It also has the effect of maintaining stable feeding of the stirred fine mill (3). The stirring mill (3) includes a stirring container (36), and the interior of the stirring container (36) is formed by a grading ring baffle (35) to form a grinding zone (31) at the lower end and a settling zone (32) at the upper end. A stirrer (33) is installed in the center of the stirring mill (3); a classifying wheel (34) is provided on the stirrer (33), the classifying wheel (34) is located below the classifying ring baffle (35), and the diameter of the classifying wheel (34) is larger than the inner diameter of the classifying ring baffle (35). The stirred fine grinding mill (3) uses 10-30mm low-chromium or medium-chromium steel balls as media, and mixes them in an appropriate ratio to provide sufficient energy density to ensure that the discharge particle size of the stirred fine grinding mill (3) is ≥90% -280 mesh; The mixing mill (3) is designed with a frequency conversion control device, with an operating frequency of 30-50Hz and an edge linear velocity of 4-5m / s for the agitator (33), which meets the crushing force requirements for materials below 1mm. The second storage container (5) is connected to the first storage container (4), and the height difference between the outlet of the second storage container (5) and the stirring mill (3) is greater than 4m.

2. The high-nickel matte fine grinding pulping system according to claim 1, characterized in that: The horizontal ball mill (1) has an automatic water volume adjustment function to ensure that the mass concentration of the slurry in the cylinder is stable in the range of 40% to 50%, and the output particle size is stable below -1mm, so as to ensure that the high nickel matte slurry has good fluidity.

3. The high-nickel matte fine grinding pulping system according to claim 1, characterized in that: The horizontal ball mill (1) is equipped with 60mm-120mm low-chromium or medium-chromium steel balls as media, and is mixed in an appropriate proportion.

4. A method of using the high-nickel matte fine grinding pulping system according to claim 1, characterized in that: S1. Input 1mm-15mm coarse high-grade nickel matte raw material into the horizontal ball mill (1); S2. After being ground by the horizontal ball mill (1), the coarse raw material is discharged into the spiral classifier (2) for classification. The slurry with a particle size of less than 1 mm overflows from the spiral classifier (2) to the first storage container (4), while the slurry with a particle size of more than 1 mm is driven by the spiral blades of the spiral classifier (2) and returned to the horizontal ball mill (1) through the return port for further grinding. S3. The slurry in the first storage container (4) is transported to the second storage container (5). The slurry in the second storage container (5) enters the grinding zone (31) of the stirred fine mill (3) through the feed port at the bottom of the stirred fine mill (3) by gravity forced flow. S4. The slurry in the grinding zone (31) of the stirred fine mill (3) is further crushed by the rotation of the agitator (33) and the steel ball media. Under the screening of the classifying wheel (34) and the classifying ring baffle (35), the slurry is discharged from the settling port located in the settling zone (32).

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