Lining plate for mineral separation ball mill and preparation method of lining plate

Abstract

The invention relates to the technical field of beneficiation ball mills, and particularly discloses a lining plate for a beneficiation ball mill and a preparation method of the lining plate for the beneficiation ball mills to solve the problems that an existing high manganese steel lining plate for the beneficiation ball mills is not excellent enough in material performance such as abrasion resistance and not long enough in service life, and the lining plate for the beneficiation ball mills comprises, by mass, 1.0%-1.2% of C, 12.5%-13.5% of Mn, 1.7%-2.3% of Cr, 1.2%-1.5% of Mo, 0.6%-0.8% of Cu, 0.15%-0.25% of Re, 0.08%-0.12% of V, smaller than or equal to 0.03% of S, smaller than or equal to 0.04% of P and the balance Fe and inevitable impurities. And the balance of Fe and inevitable impurities. By simultaneously improving the material component formula and the preparation process thereof, the high-manganese steel lining plate alloy material with high uniformity in shape and performance can be formed, the surface hardness and toughness of the material are remarkably improved, and the high-manganese steel lining plate alloy material can be more wear-resistant and the service life is obviously prolonged when the high-manganese steel lining plate alloy material is used as a mineral separation ball mill lining plate.

Description

Technical Field

[0001] The present invention relates to the technical field of ore dressing ball mills, and in particular to a liner for an ore dressing ball mill and a preparation method thereof. Background Art

[0002] Ball mills are used in industries such as metallurgy, mineral processing, fertilizers, and building materials to grind raw materials to the desired particle size. Due to the high hardness of the ore, ball mills are often equipped with liners to protect the mill's cylinder and reduce direct impact and friction between the mill and the ore. Liners of various types can also be used to adjust the mill's motion, enhancing its pulverizing effect on the material. This helps improve the mill's grinding efficiency, increase production, and reduce metal consumption.

[0003] In existing ore-dressing ball mills, the liners are easily worn due to material properties, resulting in a short service life. This leads to low production efficiency and excessive material consumption in actual production applications. Existing ore-dressing ball mill liners are often made of high-manganese steel. For example, patent publication CN113462989A proposes a niobium-microalloyed high-manganese steel liner for mining grate ball mills and a preparation method. The liner has an austenite structure with a small amount of carbides. The alloy composition, by weight, is as follows: C 1.10-1.20%; Si 0.60-0.80%; Mn 14.00-15.00%; Cr 1.00-3.00%; Nb 0.03-0.08%; P and S ≤ 0.006%; the remainder being Fe and unavoidable impurities. However, the existing high manganese steel liner, such as the one mentioned above, has a hardness of HB between 180 and 220, and a service life of 5 to 7 months during the production process, which is still far from the ideal performance conditions and use effects. That is, the present application aims to provide a liner material for a mineral processing ball mill with better material properties such as wear resistance and a longer service life. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the existing high manganese steel liner for ore dressing ball mill is not superior in material properties such as wear resistance and service life is not long enough.

[0005] The present invention is achieved through the following technical solutions: The present invention provides a liner for a mineral processing ball mill. The liner comprises the following components, calculated by mass fraction: C 1.0-1.2%, Mn 12.5-13.5%, Cr 1.7-2.3%, Mo 1.2-1.5%, Cu 0.6-0.8%, Re 0.15-0.25%, V 0.08-0.12%, S≤0.03%, P≤0.04%, and the balance is Fe and unavoidable impurities.

[0006] The present invention also provides a method for preparing the liner for the above-mentioned ore dressing ball mill, comprising the following steps: S1 batching: taking scrap steel, ferromanganese, ferrochrome, molybdenum material and copper iron according to the amount, mixing them to obtain a smelting mixture; S2 Melting: Place the molten mixture in a furnace at 1580-1600℃ for melting to obtain a molten slurry; S3 Modification and alloying treatment: add rhenium material and vanadium material to the molten slurry, mix well, and obtain casting slurry; S4 pouring and pressing: pouring the pouring slurry into the mold, controlling the pouring temperature to 1360-1420°C, and hot pressing to obtain a pouring compact; S5 Two-stage water toughening treatment: the cast compact is placed at 1030-1080°C for a first water toughening treatment, followed by water jet quenching; then placed at 780-820°C for a second water toughening treatment, followed by vortex stirring quenching, and cooled to obtain the liner for the mineral processing ball mill.

[0007] Preferably, in step S1, the particle size of the material block is controlled to be 50-80 mm.

[0008] Preferably, in step S2, the smelting mixture is added into the medium frequency furnace in small amounts and multiple times, and heating and smelting are started from the time of adding the materials.

[0009] Preferably, in step S3, rhenium material and vanadium material are added and mixed under an argon protective atmosphere.

[0010] Preferably, in step S4, the tapping temperature of the pouring slurry is 1420-1480°C.

[0011] Preferably, in step S4, the hot pressing pressure is -0.055 MPa to -0.035 MPa, and the pressure is maintained for 3-10 minutes.

[0012] Preferably, in step S5, before the double-stage water toughening treatment, the cast compact is first cooled to below 600°C at a rate of 200-300°C / h.

[0013] Preferably, in step S5, the first water toughening treatment time is 1.5-2.5 hours, and the second water toughening treatment time is 1-2 hours.

[0014] Preferably, in step S5, during the heating stage of the double-stage water toughening treatment, when the temperature is less than 350°C, the heating rate is less than 80°C / h; when the temperature is between 350-750°C, the heating rate is 80-100°C / h; when the temperature is greater than 750°C, the heating rate is greater than 100°C / h.

[0015] The technical solution of the present invention has the following beneficial effects: After research, the present invention found that the factors affecting the service life of the liner of the mineral processing ball mill specifically include: first, by introducing modified alloy elements to optimize the grain morphology and material properties, due to the small amount of addition and the vague range, the grain boundary purification effect is unstable, resulting in a low overall performance level of the material; second, during the production process, affected by the temperature change rate of heating and cooling, the crystal morphology uniformity in the alloy material is low, which ultimately results in poor material performance uniformity, such as the hardness difference between the material surface and the inner core is too large, and the hardness of the material surface is low, which manifests as severe wear and short service life during use.

[0016] Based on the above-mentioned problems existing in the current high manganese steel liner, the present invention improves the material component formula and its preparation process at the same time, and can form a high manganese steel liner alloy material with high uniformity in morphology and performance, and the surface hardness and toughness of the material are significantly improved. When used as a liner of a mineral processing ball mill, it can be more wear-resistant and its service life is significantly increased. Specifically, the present invention introduces Re and V, which can act on the interior of the alloy to form a uniform and fine grain morphology on the surface and inside. Through the synergistic effect of Mo-Re-V, a self-triggered martensitic phase transformation is achieved, and the wear resistance and toughness of the material are significantly improved; and through the regulation of the process treatment process and conditions, a lath martensitic matrix is obtained, and after multi-stage water toughening treatment, the residual austenite is promoted to transform into nano-twinned austenite. The final liner alloy material has a hardness difference of less than 5HB inside and outside, which can be applied to various liners and other wear-resistant parts.

[0017] Specific implementation content To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are described clearly and completely below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed; and where the manufacturers of the instruments, equipment, reagents, and raw materials used are not specified, they are all commercially available conventional products.

[0018] The present invention provides a liner for a mineral processing ball mill. The liner comprises the following components, calculated by mass fraction: C 1.0-1.2%, Mn 12.5-13.5%, Cr 1.7-2.3%, Mo 1.2-1.5%, Cu 0.6-0.8%, Re 0.15-0.25%, V 0.08-0.12%, S≤0.03%, P≤0.04%, and the balance is Fe and unavoidable impurities.

[0019] By introducing modified alloying elements such as rhenium (Re), the as-cast structure can be refined, the grain boundaries can be purified, and smaller and more uniform casting grains can be obtained. The morphology and distribution of carbides and inclusions can also be improved, thereby increasing the fatigue resistance and fatigue spalling resistance of the liner alloy material and maintaining sufficient toughness, thereby fully meeting the requirements of the liner's performance.

[0020] Manganese (Mn) is the main strengthening element. Part of Mn dissolves in ferrite to strengthen the matrix, and the remaining Mn combines with C to form Mn3C during the production process, and forms (FeMn)3C type carbides in the steel, which can increase the amount of pearlite in the steel. And because Mn lowers the γFe phase transformation temperature, it can reduce the decomposition rate of austenite, that is, reduce the precipitation rate of carbides, thereby greatly improving the hardenability of the material.

[0021] Chromium (Cr) forms alloy cementite (FeCr)3C and alloy carbides (FeCr)7C3 with the carbon and iron in steel. These alloys partially dissolve into the solid solution, strengthening the matrix and further improving the material's hardenability. Cr exhibits significant tempering resistance, ensuring uniform performance across thick end surfaces. Furthermore, a 1.7-2.3wt% Cr addition prevents a significant increase in retained austenite in both quenched and tempered structures.

[0022] Molybdenum (Mo) can effectively refine the grain structure in the liner alloy material, strongly inhibit the transformation of austenite to pearlite during the heat treatment stage, and stabilize the heat treatment structure; in the Cr-Mo-Si alloy system, it can significantly improve the material's hardenability and cross-sectional uniformity, prevent the occurrence of temper brittleness, improve tempering stability, improve impact toughness, and increase the material's resistance to thermal fatigue.

[0023] Copper (Cu) itself has low solubility in steel and cannot form a continuous solid solution with iron, meaning it does not form carbides with C. However, proper heat treatment can produce precipitation hardening, which can improve the steel's hardenability and the electrode potential of the matrix, thereby increasing corrosion resistance. The solubility of Cu in iron changes dramatically with decreasing temperature, so the process conditions during heat treatment have a decisive influence on Cu and its corresponding material properties.

[0024] During the synthesis and production process, vanadium (V) can form VC carbides with a particle size of 0.2-0.5μm with C. By adjusting the grain morphology within the material, the wear resistance of the material can be significantly improved.

[0025] Improves the material's hardenability, toughness, and hardness, resulting in strong wear resistance. It's particularly suitable for wear conditions with low to medium impact loads, or no impact loads, and offers significant advantages in low cost and high performance. Those skilled in the art can apply this material to wear-resistant castings such as ball mill liners, crusher hammers, and excavator bucket teeth, depending on actual conditions.

[0026] The present invention also provides a method for preparing the liner for the above-mentioned ore dressing ball mill, comprising the following steps: (1) Raw material pretreatment Scrap steel, ferromanganese, ferrochrome, molybdenum and copper iron are taken in appropriate amounts, crushed and processed to control the particle size of the material blocks to 50-80 mm, and mixed to obtain a smelting mixture.

[0027] (2) Melting The molten mixture is added into the medium frequency furnace in small amounts and multiple times, and heating and melting are started from the time of adding the materials until the furnace temperature reaches 1580-1600℃ to obtain a molten slurry.

[0028] (3) Modification and alloying treatment Under argon protection, rhenium material and vanadium material are added to the molten slurry at 1580-1600°C, and the mixture is stirred and mixed to obtain a casting hot pack.

[0029] (4) Casting and pressing The tapping temperature of the pouring hot ladle is controlled to be 1420-1480℃. Within this temperature range, the formation of columnar crystals can be avoided, thereby avoiding cracks and preventing the wear resistance of the material from decreasing. The slurry is poured into the mold at a pouring temperature of 1360-1420℃, and a negative pressure of -0.055MPa to -0.035MPa is adopted, and the pressure is maintained for 3-10min. The temperature is then lowered to below 600℃ at a rate of 200-300℃ / h to obtain a cast compact.

[0030] During the pouring process, multiple dispersed ingates are introduced from the thin wall of the casting and are in the shape of a flat and wide trumpet. The cross-sectional area close to the casting is larger than the cross-sectional area connected to the runner, so that the molten metal can be quickly and smoothly injected into the mold to prevent excessive temperature differences in the entire mold. The diameter of the riser should be larger than the diameter of the hot spot, close to the hot spot, and the height should be 2.5-3.0 times the diameter. Hot risers or even a combined pouring and rising gate must be used to allow sufficient high-temperature molten metal to fill the vacant space of the casting during solidification shrinkage.

[0031] (5) Two-stage water toughening treatment The cast compact is placed at 1030-1080°C for a water toughening treatment for 1.5-2.5 hours, and then quenched with a 5-10m / s water jet; placed again at 780-820°C for a second water toughening treatment for 1-2 hours, and then eddy current stirring quenching is performed with water temperature ≤35°C. After complete cooling, a liner for a mineral processing ball mill is obtained.

[0032] The heating temperature for water toughening varies as follows: when the temperature is <350°C, the heating rate is <80°C / h; when the temperature is between 350-750°C, the heating rate is 80-100°C / h; when the temperature is >750°C, the casting enters a plastic state, and a rapid heating rate of >100°C / h can be used. In actual application, those skilled in the art should adjust the water toughening time appropriately based on the size of the compact, and can increase the water toughening time by approximately 0.5 h for every 50 mm increase in thickness.

[0033] Example 1 The liner of this embodiment comprises the following components by mass: C 1.1%, Mn 13%, Cr 2%, Mo 1.3%, Cu 0.7%, Re 0.2%, V 0.1%, S ≤ 0.03%, P ≤ 0.04%, with the remainder being Fe and unavoidable impurities. The preparation process is as follows: Take scrap steel, ferromanganese, ferrochrome, molybdenum material and copper iron, crush them separately, take blocks with a particle size of 60±5mm, mix them, and obtain a molten mixture; add the molten mixture into the medium frequency furnace in small amounts of 250g / time, and start heating and melting from the time of adding the materials until the furnace temperature reaches 1590±5℃ to obtain a molten slurry; while the molten slurry is maintained at 1590±5℃, under the protection of argon, add rhenium material and vanadium material, stir and mix well to obtain a casting hot bag; control the steel tapping temperature of the casting hot bag to 1450±5℃, inject the casting hot bag into the mold at a pouring temperature of 1380±5℃, and hot press at a negative pressure of -0.045MPa, hold the pressure for 5min, and then heat for 2min. The temperature is lowered to below 600°C at a rate of 50±5°C / h to obtain a casting compact; the casting compact is taken and heated, and the heating conditions during heating are satisfied: when the temperature is less than 350°C, the heating rate is 75±5°C / h; when the temperature is between 350-750°C, the heating rate is 90±5°C / h; when the temperature is greater than 750°C, the heating rate is 120±5°C / h, until it reaches 1050°C, and a water toughening treatment is carried out for 2h, and then quenched by an 8m / s water jet; it is heated to 800°C at the same heating rate, and a secondary water toughening treatment is carried out for 1.5h, and then eddy current stirring quenching is carried out with water temperature ≤35°C, and after complete cooling, a liner for a mineral processing ball mill is obtained.

[0034] Example 2 The liner of this embodiment comprises the following components by mass: C 1.1%, Mn 13%, Cr 2%, Mo 1.3%, Cu 0.7%, Re 0.15%, V 0.08%, S ≤ 0.03%, P ≤ 0.04%, with the remainder being Fe and unavoidable impurities. The preparation process is as follows: Take scrap steel, ferromanganese, ferrochrome, molybdenum material and copper iron, crush them separately, take blocks with a particle size of 60±5mm, mix them, and obtain a molten mixture; add the molten mixture into the medium frequency furnace in small amounts of 250g / time, and start heating and melting from the time of adding the materials until the furnace temperature reaches 1590±5℃ to obtain a molten slurry; while the molten slurry is maintained at 1590±5℃, under the protection of argon, add rhenium material and vanadium material, stir and mix well to obtain a casting hot bag; control the steel tapping temperature of the casting hot bag to 1450±5℃, inject the casting hot bag into the mold at a pouring temperature of 1380±5℃, and hot press at a negative pressure of -0.045MPa, hold the pressure for 5min, and then heat for 2min. The temperature is lowered to below 600°C at a rate of 50±5°C / h to obtain a casting compact; the casting compact is taken and heated, and the heating conditions during heating are satisfied: when the temperature is less than 350°C, the heating rate is 75±5°C / h; when the temperature is between 350-750°C, the heating rate is 90±5°C / h; when the temperature is greater than 750°C, the heating rate is 120±5°C / h, until it reaches 1050°C, and a water toughening treatment is carried out for 2h, and then quenched by an 8m / s water jet; it is heated to 800°C at the same heating rate, and a secondary water toughening treatment is carried out for 1.5h, and then eddy current stirring quenching is carried out with water temperature ≤35°C, and after complete cooling, a liner for a mineral processing ball mill is obtained.

[0035] Example 3 The liner of this embodiment comprises the following components by mass: C 1.1%, Mn 13%, Cr 2%, Mo 1.3%, Cu 0.7%, Re 0.24%, V 0.12%, S ≤ 0.03%, P ≤ 0.04%, with the remainder being Fe and unavoidable impurities. The preparation process is as follows: Take scrap steel, ferromanganese, ferrochrome, molybdenum material and copper iron, crush them separately, take blocks with a particle size of 60±5mm, mix them, and obtain a molten mixture; add the molten mixture into the medium frequency furnace in small amounts of 250g / time, and start heating and melting from the time of adding the materials until the furnace temperature reaches 1590±5℃ to obtain a molten slurry; while the molten slurry is maintained at 1590±5℃, under the protection of argon, add rhenium material and vanadium material, stir and mix well to obtain a casting hot bag; control the steel tapping temperature of the casting hot bag to 1450±5℃, inject the casting hot bag into the mold at a pouring temperature of 1380±5℃, and hot press at a negative pressure of -0.045MPa, hold the pressure for 5min, and then heat for 2min. The temperature is lowered to below 600°C at a rate of 50±5°C / h to obtain a casting compact; the casting compact is taken and heated, and the heating conditions during heating are satisfied: when the temperature is less than 350°C, the heating rate is 75±5°C / h; when the temperature is between 350-750°C, the heating rate is 90±5°C / h; when the temperature is greater than 750°C, the heating rate is 120±5°C / h, until it reaches 1050°C, and a water toughening treatment is carried out for 2h, and then quenched by an 8m / s water jet; it is heated to 800°C at the same heating rate, and a secondary water toughening treatment is carried out for 1.5h, and then eddy current stirring quenching is carried out with water temperature ≤35°C, and after complete cooling, a liner for a mineral processing ball mill is obtained.

[0036] Comparative Example 1 The liner of this embodiment comprises the following components by mass: C 1.1%, Mn 13%, Cr 2%, Mo 1.3%, Cu 0.7%, S ≤ 0.03%, P ≤ 0.04%, with the remainder being Fe and unavoidable impurities. The preparation process is as follows: Scrap steel, ferromanganese, ferrochrome, molybdenum and copper iron are taken and crushed respectively, and blocks with a particle size of 60±5 mm are taken and mixed to obtain a molten mixture; the molten mixture is added into the medium frequency furnace in small amounts of 250 g / time and multiple times, and heating and melting are started from the time of adding the materials, and the furnace temperature reaches 1590±5°C to obtain a molten hot bag; the tapping temperature of the pouring hot bag is controlled to be 1450±5°C, and the pouring temperature is 1380±5°C, and the pouring hot bag is injected into the mold, and hot pressing is performed at a negative pressure of -0.045 MPa, the pressure is maintained for 5 minutes, and then the temperature is reduced to below 600°C at 250±5°C / h to obtain a pouring compact. ; Take the cast compact and heat it, and the heating conditions during heating are as follows: when the temperature is less than 350℃, the heating rate is 75±5℃ / h; when the temperature is between 350-750℃, the heating rate is 90±5℃ / h; when the temperature is greater than 750℃, the heating rate is 120±5℃ / h, until it reaches 1050℃, and then perform a water toughening treatment for 2h, and then quench it with an 8m / s water jet; heat it to 800℃ at the same heating rate, perform a secondary water toughening treatment for 1.5h, and then use a water temperature of ≤35℃ for vortex stirring quenching. After complete cooling, a liner for a mineral processing ball mill is obtained.

[0037] Comparative Example 2 The liner of this embodiment comprises the following components by mass: C 1.1%, Mn 13%, Cr 2%, Mo 1.3%, Cu 0.7%, Re 0.2%, V 0.1%, S ≤ 0.03%, P ≤ 0.04%, with the remainder being Fe and unavoidable impurities. The preparation process is as follows: Scrap steel, ferromanganese, ferrochrome, molybdenum and copper iron are taken and crushed respectively, and blocks with a particle size of 60±5 mm are taken and mixed to obtain a molten mixture; the molten mixture is added into a medium frequency furnace in small amounts of 250 g / time, and heated and melted from the time of adding the materials until the furnace temperature reaches 1590±5°C to obtain a molten slurry; while the molten slurry is maintained at 1590±5°C, rhenium and vanadium materials are added under argon protection, and the mixture is stirred and mixed to obtain a casting hot pack; the casting hot pack is controlled The tapping temperature is 1450±5℃, the pouring hot bag is injected into the mold at a pouring temperature of 1380±5℃, and hot pressing is carried out at a negative pressure of -0.045MPa, the pressure is maintained for 5 minutes, and then the temperature is lowered to below 600℃ at a rate of 250±5℃ / h to obtain a casting compact; the casting compact is taken and heated at a heating rate of 90±5℃ / h until it reaches 1050℃ for 3 hours, and then quenched by a water jet of 8m / s. After complete cooling, a liner is obtained.

[0038] Test example Samples: Examples 1-3 and Comparative Examples 1-2 The above samples were taken separately and the material properties of the samples were measured according to GB / T 4340.1-2024 "Vickers hardness test for metallic materials" and GB / T1817-2017 "Test method for room temperature impact toughness of cemented carbide". The results are summarized in Table 1 below: Table 1 Material performance test results of different samples

[0039] According to the above test and measurement results, the lining materials prepared in Examples 1 to 3 show significantly better performance than the liners in Comparative Examples 1 and 2 in terms of hardness uniformity (i.e., the difference between surface hardness and inner core hardness) and impact toughness. This shows that the liner for a mineral processing ball mill and the preparation method thereof proposed in the present invention can solve the problems of poor wear resistance and short service life of existing liners due to heterogeneous internal and external performance of the material, making it more suitable for wear-resistant castings such as mineral processing ball mill liners, crusher hammers, and excavator bucket teeth.

[0040] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A liner for a mineral processing ball mill, characterized in that: Calculated by mass fraction, it includes the following components: C 1.0-1.2%, Mn 12.5-13.5%, Cr 1.7-2.3%, Mo 1.2-1.5%, Cu 0.6-0.8%, Re 0.15-0.25%, V 0.08-0.12%, S≤0.03%, P≤0.04%, and the balance is Fe and unavoidable impurities.

2. A method for preparing a liner for a ore dressing ball mill according to claim 1, characterized in that: The steps include: S1 batching: taking scrap steel, ferromanganese, ferrochrome, molybdenum material and copper iron according to the amount, mixing them to obtain a smelting mixture; S2 Melting: Place the molten mixture in a furnace at 1580-1600℃ for melting to obtain a molten slurry; S3 Modification and alloying treatment: add rhenium material and vanadium material to the molten slurry, mix well, and obtain casting slurry; S4 pouring and pressing: pouring the pouring slurry into the mold, controlling the pouring temperature to 1360-1420°C, and hot pressing to obtain a pouring compact; S5 Two-stage water toughening treatment: the cast compact is placed at 1030-1080°C for a first water toughening treatment, followed by water jet quenching; then placed at 780-820°C for a second water toughening treatment, followed by vortex stirring quenching, and cooled to obtain the liner for the mineral processing ball mill.

3. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S1, the particle size of the material block is controlled to be 50-80 mm.

4. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S2, the smelting mixture is added into the medium frequency furnace in small amounts and multiple times, and heating and smelting are started from the time of adding the materials.

5. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S3, under an argon protective atmosphere, rhenium material and vanadium material are added and mixed.

6. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S4, the tapping temperature of the cast slurry is 1420-1480°C.

7. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S4, the hot pressing pressure is -0.055 MPa to -0.035 MPa, and the pressure is maintained for 3-10 minutes.

8. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S5, before the double-stage water toughening treatment, the cast compact is cooled to below 600°C at a rate of 200-300°C / h.

9. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S5, the first water toughening treatment time is 1.5-2.5 hours, and the second water toughening treatment time is 1-2 hours.

10. The method for preparing a liner for a ore dressing ball mill according to claim 2, wherein: In step S5, during the heating phase of the double-stage water toughening treatment, when the temperature is less than 350°C, the heating rate is less than 80°C / h; when the temperature is between 350-750°C, the heating rate is 80-100°C / h; when the temperature is greater than 750°C, the heating rate is greater than 100°C / h.

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