Semi-self-grinding feeding trolley lining plate and manufacturing method thereof

Abstract

The invention discloses a semi-self-grinding feeding trolley lining plate and a manufacturing method thereof.The lining plate comprises a plate-shaped base body made of an iron-based nickel-molybdenum alloy material and a plurality of rod-shaped inlay bodies made of a metal ceramic material, and the rod-shaped inlay bodies are embedded in the plate-shaped base body at intervals; and the upper ends of the plurality of rod-shaped inlay bodies protrude out of the plate-shaped base body. When the rod-shaped inlay made of the metal ceramic material is prepared, Fe is used as an adhesive, a ceramic preform is pressed firstly, then vacuum sintering is performed, the obtained rod-shaped inlay is small in ceramic particle size and uniform in distribution, and the ceramic and Fe interface is clean, free of pollution and tight in combination. According to the lining plate, the rod-shaped inlay bodies which are distributed in a latticed mode and made of the metal ceramic material are embedded in the plate-shaped base body made of the iron-based nickel-molybdenum alloy material, and the impact force on the lining plate during ore blanking can be dispersed.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a semi-autogenous grinding feeding trolley lining plate and a manufacturing method thereof. Background Art

[0002] The semi-autogenous grinding feed trolley is a key equipment of the material conveying system in the field of mineral processing. It has the characteristics of large flow rate, harsh working conditions and irreplaceable, and is the throat of the entire conveying system. This working condition puts forward strict performance requirements on the lining material of the feed trolley. On the one hand, the impact of large flow liquid-solid two-phase flow requires sufficient impact resistance; on the other hand, the ore with uneven particle size has a serious wear effect on the surface of the lining. In addition, various ions in the liquid medium put forward certain requirements on the corrosion resistance of the material.

[0003] At present, the lining of the semi-autogenous grinding feeding trolley is mainly made of alloy steel such as 20CrMo, NM500, medium and high manganese steel, etc., which often cannot meet the requirements of strength, toughness, wear resistance and other performance requirements during use. For example, high manganese steel relies on work hardening under strong impact to increase hardness and thus resist wear, but it is easy to deform under such conditions. In addition, some scholars have proposed a technical route of using cobalt-based cemented carbide grinding rods and alloy steel to prepare the lining of the feeding trolley, but there are still the following problems: (1) The bonding between the grinding rod and the substrate is not tight enough, the hardness is low, and after working for a long time, it is difficult to resist the impact of the ore and is easy to wear; (2) When manufacturing the lining, the material cannot be adjusted according to different service performance, so it is impossible to prepare linings with different ceramic types, contents, and distributions; (3) The substrate has a low hardness and cannot provide good protection for the grinding rod. Summary of the invention

[0004] The main purpose of the present invention is to provide a semi-autogenous grinding feeding trolley lining plate and a manufacturing method thereof, which can disperse the impact force on the lining plate when ore falls and increase the service life.

[0005] To achieve the above-mentioned purpose, the present invention provides a semi-autogenous grinding feeding trolley lining, comprising a plate-like substrate made of an iron-based nickel-molybdenum alloy and a plurality of rod-like inlays made of a metal ceramic material, wherein the plurality of rod-like inlays are embedded in the plate-like substrate at intervals with the upper ends of the plurality of rod-like inlays protruding from the plate-like substrate.

[0006] Furthermore, the plurality of rod-shaped inlays are arranged and distributed in a grid shape.

[0007] Furthermore, the diameter of the rod-shaped inlay is 5 to 20 mm.

[0008] Furthermore, the composition of the iron-based nickel-molybdenum alloy includes 50wt% carbon steel powder, 42.7wt% iron powder, 4wt% nickel powder, and 3.3wt% ferromolybdenum powder, wherein the carbon content of the carbon steel powder is 0.8wt% and the molybdenum content of the ferromolybdenum powder is 60wt%.

[0009] Furthermore, the metal ceramic is a carbide-based metal ceramic.

[0010] Furthermore, the carbide-based metal ceramic is selected from any one or more of WC (tungsten carbide) ceramics, TiC (titanium carbide) ceramics, VC (vanadium carbide) ceramics, TaC (tantalum carbide) ceramics, and NbC (niobium carbide) ceramics.

[0011] Furthermore, the thickness of the plate-like substrate is 100 mm, the upper end of the rod-like inlay protrudes from the plate-like substrate by 5 to 10 mm, and the lower end is 20 to 35 mm away from the bottom surface of the plate-like substrate.

[0012] The present invention also provides a method for manufacturing the above-mentioned semi-autogenous grinding feeding trolley lining, comprising the following steps:

[0013] (1): Carbide-based metal powder and iron powder are uniformly mixed, and a ceramic preform is pressed by cold isostatic pressing at a molding pressure of 50 MPa, and then sintered for 2 to 2.5 hours under vacuum conditions at a temperature of 1300 to 1350° C. to obtain a rod-shaped inlay made of metal ceramic material;

[0014] (2): Pass each raw material of the iron-based nickel-molybdenum alloy through a 60-mesh sieve, and then dry and mix them evenly to obtain an alloy raw material mixture;

[0015] (3): Fill the lining plate mold with the alloy raw material mixture and insert the rod-shaped inlay at the same time, and then sinter in a vacuum sintering furnace at a temperature of 1000-1150° C. for a holding time of 30-120 min to obtain the semi-autogenous grinding feed trolley lining plate.

[0016] The beneficial effects of the present invention are embodied in:

[0017] (1) When preparing the rod-shaped inlay of metal ceramic material, the present invention uses Fe as a binder, first presses out a ceramic preform, and then vacuum sinters it to obtain a rod-shaped inlay with fine ceramic particles and uniform distribution, and the interface between the ceramic and Fe is clean and pollution-free, and the combination is tight.

[0018] (2) The present invention embeds rod-shaped inlays made of metal ceramic material in a grid-like distribution within a plate-like matrix made of an iron-based nickel-molybdenum alloy, which can disperse the impact force of ore falling on the liner. The upper ends of the rod-shaped inlays protrude from the plate-like matrix. On the one hand, the rod-shaped inlays are highly hard and wear-resistant, and can withstand the wear of the ore, thereby playing a role in pre-protecting the alloy matrix. On the other hand, ore materials can be stored between the protruding rod-shaped inlays, so that the scattered ore directly hits the stored materials, buffering its impact energy and indirectly protecting the liner.

[0019] (3) The rod-shaped inlay made of metal ceramic material of the present invention has higher hardness and can resist the impact wear of ore.

[0020] (4) The continuous iron-based nickel-molybdenum alloy plate-shaped matrix of the present invention can provide good protection for the metal ceramic rod.

[0021] (5) The present invention can design and adjust the material components to prepare linings with different ceramic types, contents, and distributions to meet the needs of different service performances. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the semi-autogenous grinding feeding trolley liner of the present invention.

[0023] Figure 2 The utility model is a schematic diagram of the structure of the liner mold of the semi-autogenous grinding feeding trolley liner of the present invention.

[0024] Figure 3 It is a schematic diagram of the distribution of rod-shaped inlays in the liner of the semi-autogenous grinding feeding trolley of the present invention.

[0025] Figure 4 This is a real photo of a semi-autogenous grinding feeding trolley liner manufactured according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0027] Unless otherwise specified, the raw materials, reagents or devices used in the following examples can be obtained from conventional commercial sources or can be obtained by existing known methods; unless otherwise specified, the methods used in the examples of the present invention are methods known to those skilled in the art.

[0028] like Figure 1As shown, the semi-autogenous grinding feed trolley lining of the present invention comprises a plate-like substrate 1 made of an iron-based nickel-molybdenum alloy and a plurality of rod-like inlays 2 made of a metal ceramic material, wherein the plurality of rod-like inlays 2 are embedded in the plate-like substrate 1 at intervals, and the upper ends of the plurality of rod-like inlays 2 protrude from the plate-like substrate 1; in the present invention, the plate-like substrate 1 may be a flat plate or an arc-shaped plate, such as Figure 2 As shown, the lining plate mold is composed of a lower mold plate 3 and an upper mold plate 4. The upper mold plate 4 is provided with a through hole for the rod-shaped inlay 2 to pass through. The space enclosed by the lower mold plate 3 and the upper mold plate 4 is used to form the plate-shaped substrate 1.

[0029] Example 1

[0030] Manufacturing of lining plate for semi-autogenous grinding feeding trolley

[0031] The steps are as follows:

[0032] (1): WC powder and iron powder were mixed uniformly in a mass ratio of 8:2, and a round rod-shaped ceramic preform with a diameter of 10 mm and a height of 80 mm was pressed out by cold isostatic pressing at a molding pressure of 50 MPa, and then sintered for 2 h under vacuum conditions of less than 500 Pa and a temperature of 1300°C to obtain a rod-shaped inlay made of metal ceramic material;

[0033] (2): taking, by mass percentage, 50% of carbon steel powder, 42.7% of iron powder, 4% of nickel powder, and 3.3% of ferromolybdenum powder through a 60-mesh sieve, wherein the carbon content of the carbon steel powder is 0.8wt%, and the molybdenum content of the ferromolybdenum powder is 60wt%, and then drying and mixing them uniformly to obtain an alloy raw material mixture;

[0034] (3): Fill the liner mold with the alloy raw material mixture (the length, width and thickness of the liner mold cavity are 880 mm, 680 mm and 100 mm respectively, with an arc of 15 degrees, and a pressure of 10 MPa is used for compaction during filling, the same below, and no further details are given) and insert the rod-shaped inlay (such as Figure 3 As shown, the lower end of the rod-shaped inlay is 25 mm away from the bottom of the mold, the rod-shaped inlays are arranged in a grid shape, and the spacing H between the rod-shaped inlays is 40 mm and L is 35 mm, the same below, no further description). Then, the liner mold is placed in a vacuum sintering furnace, and the temperature is increased to 1000°C at a heating rate of 10°C / min, and sintered at this temperature for 30 minutes to obtain a semi-autogenous feeding trolley liner. The actual object is shown in FIG. Figure 4 shown.

[0035] Example 2

[0036] Manufacturing of lining plate for semi-autogenous grinding feeding trolley

[0037] The steps are as follows:

[0038] (1): TiC powder and iron powder are uniformly mixed in a mass ratio of 8:2, and a round rod-shaped ceramic preform with a diameter of 10 mm and a height of 80 mm is pressed by a cold isostatic pressing method at a molding pressure of 50 MPa, and then sintered for 2.25 h under a vacuum condition of less than 500 Pa and a temperature of 1325° C. to obtain a rod-shaped inlay made of metal ceramic material;

[0039] (2): taking, by mass percentage, 50% of carbon steel powder, 42.7% of iron powder, 4% of nickel powder, and 3.3% of ferromolybdenum powder through a 60-mesh sieve, wherein the carbon content of the carbon steel powder is 0.8wt%, and the molybdenum content of the ferromolybdenum powder is 60wt%, and then drying and mixing them uniformly to obtain an alloy raw material mixture;

[0040] (3): The alloy raw material mixture is filled in the liner mold and the rod-shaped inlay is inserted at the same time. Then, the liner mold is placed in a vacuum sintering furnace, the temperature is increased to 1100°C at a heating rate of 10°C / min, and sintered at this temperature for 75 minutes to obtain a semi-autogenous grinding feeding trolley liner.

[0041] Example 3

[0042] Manufacturing of lining plate for semi-autogenous grinding feeding trolley

[0043] The steps are as follows:

[0044] (1): VC powder and iron powder were mixed uniformly in a mass ratio of 8:2, and a round rod-shaped ceramic preform with a diameter of 10 mm and a height of 80 mm was pressed out by cold isostatic pressing at a molding pressure of 50 MPa, and then sintered for 2.5 h under vacuum conditions of less than 500 Pa and a temperature of 1350°C to obtain a rod-shaped inlay made of metal ceramic material;

[0045] (2): taking, by mass percentage, 50% of carbon steel powder, 42.7% of iron powder, 4% of nickel powder, and 3.3% of ferromolybdenum powder through a 60-mesh sieve, wherein the carbon content of the carbon steel powder is 0.8wt%, and the molybdenum content of the ferromolybdenum powder is 60wt%, and then drying and mixing them uniformly to obtain an alloy raw material mixture;

[0046] (3): The alloy raw material mixture is filled in the liner mold and the rod-shaped inlay is inserted at the same time. Then, the liner mold is placed in a vacuum sintering furnace, the temperature is increased to 1150°C at a heating rate of 10°C / min, and sintered at this temperature for 120 minutes to obtain a semi-autogenous feeding trolley liner.

[0047] Comparative Example 1

[0048] This comparative example is based on Example 1, omitting the iron powder in step (1) to produce a semi-autogenous feeding trolley lining plate with a rod-shaped inlay without using iron powder.

[0049] Comparative Example 2

[0050] This comparative example is based on Example 1, omitting step (1) and not using rod-shaped inlays in step (3), thereby manufacturing a semi-autogenous feeding trolley lining plate without rod-shaped inlays.

[0051] Performance test of semi-autogenous grinding feeding trolley lining

[0052] The plate-like substrate and the rod-like inlay of the semi-autogenous feeding trolley lining prepared in the above-mentioned embodiments and comparative examples were subjected to microhardness test, fracture toughness test and impact test. The microhardness test was carried out in accordance with the national standard GB / T 4342-1991 "Method for testing metal microscopic Vickers hardness"; the fracture toughness test was carried out in accordance with the national standard GB / T 21143-2014 "Uniform test method for quasi-static fracture toughness of metallic materials"; and the impact test was carried out in accordance with the national standard GB / T 229-2007 "Metal Charpy pendulum impact test method".

[0053] There is no national or industry standard for the service life of the liner of the semi-autogenous grinding mill feed trolley. According to the ore processing capacity of our company's HP500 semi-autogenous grinding mill, the liner wear thickness is used as its damage standard. It is stipulated that when the thickness of the liner wear exceeds 50mm, that is, half of the total thickness of the liner, the liner cannot continue to serve. The larger the processing capacity, the longer the service life. The test results are shown in Table 1.

[0054] Table 1

[0055]

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A semi-autogenous grinding feeding trolley lining, characterized in that: It comprises a plate-shaped substrate made of an iron-based nickel-molybdenum alloy and a plurality of rod-shaped inlays made of a metal ceramic material. The plurality of rod-shaped inlays are embedded in the plate-shaped substrate at intervals, and the upper ends of the plurality of rod-shaped inlays protrude from the plate-shaped substrate.

2. The semi-autogenous grinding feed trolley lining plate according to claim 1, characterized in that: The plurality of rod-shaped inlays are arranged and distributed in a grid shape.

3. The semi-autogenous grinding feed trolley lining plate according to claim 1 or 2, characterized in that: The diameter of the rod-shaped inlay is 5 to 20 mm.

4. The semi-autogenous grinding feed trolley lining plate according to claim 1 or 2, characterized in that: The iron-based nickel-molybdenum alloy comprises 50wt% carbon steel powder, 42.7wt% iron powder, 4wt% nickel powder and 3.3wt% ferromolybdenum powder, wherein the carbon content of the carbon steel powder is 0.8wt% and the molybdenum content of the ferromolybdenum powder is 60wt%.

5. The semi-autogenous grinding feed trolley lining plate according to claim 1 or 2, characterized in that: The metal ceramic is a carbide-based metal ceramic.

6. The semi-autogenous grinding feed trolley lining plate according to claim 5, characterized in that: The carbide-based metal ceramic is selected from any one or more of WC ceramics, TiC ceramics, VC ceramics, TaC ceramics, and NbC ceramics.

7. The semi-autogenous grinding feed trolley lining plate according to claim 1 or 2, characterized in that: The thickness of the plate-like substrate is 100 mm, the upper end of the rod-like inlay protrudes from the plate-like substrate by 5 to 10 mm, and the lower end is 20 to 35 mm away from the bottom surface of the plate-like substrate.

8. The method for manufacturing a semi-autogenous grinding feed trolley lining according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1): Carbide-based metal powder and iron powder are uniformly mixed, and a ceramic preform is pressed by cold isostatic pressing at a molding pressure of 50 MPa, and then sintered for 2 to 2.5 hours under vacuum conditions at a temperature of 1300 to 1350° C. to obtain a rod-shaped inlay made of metal ceramic material; (2): Pass each raw material of the iron-based nickel-molybdenum alloy through a 60-mesh sieve, and then dry and mix them evenly to obtain an alloy raw material mixture; (3): Fill the lining plate mold with the alloy raw material mixture and insert the rod-shaped inlay at the same time, and then sinter in a vacuum sintering furnace at a temperature of 1000-1150° C. for a holding time of 30-120 min to obtain the semi-autogenous grinding feed trolley lining plate.

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