High-wear-resistance mixed pelletizer lining plate and preparation method thereof

Abstract

The invention belongs to the technical field of lining plates, and particularly discloses a high-wear-resistance mixed pelletizer lining plate and a preparation method thereof.The lining plate comprises a base layer and a wear-resistant layer compounded on the surface of the base layer, the base layer is made of a high-strength alloy steel material, and the chemical components of the base layer comprise, by mass, 0.25%-0.35% of C, 0.4%-0.8% of Si, 1.2%-1.6% of Mn, 0.8%-1.2% of Cr, 0.2%-0.4% of Mo, 0.3%-0.6% of Ni, 1.0%-1.6% of Nb and the balance Fe; the wear-resistant layer comprises tungsten carbide particles, a composite alloy material and an adhesive. According to the high-wear-resistance mixed pelletizer lining plate and the preparation method thereof, the problems that an existing mixed pelletizer lining plate is insufficient in wear resistance and short in service life are solved, and the comprehensive performance of the mixed pelletizer lining plate is improved through the composite structure design and the special preparation technology.

Description

Technical Field

[0001] The invention relates to the technical field of lining plates, in particular to a high-wear-resistant mixing pelletizing machine lining plate and a preparation method thereof. Background Art

[0002] The mixing pelletizer is a device that mechanically condenses fine-grained materials into spherical particles (pellets) under certain conditions. Fine powder materials are made into pellets to improve their fluidity and transportation performance. They provide regular-shaped and high-strength raw materials for subsequent processes such as sintering and roasting, thereby improving production efficiency and product quality. An appropriate amount of water or binder is sprayed into the material to give it a certain humidity and viscosity. Using a rotating disc or drum, the material is continuously rolled and gradually condensed into spherical particles under the action of centrifugal force and friction. Qualified pellets are separated through a screen or sorting device, and unqualified materials are returned for reprocessing.

[0003] The mixing pelletizer liner is a protective layer installed on the inner wall of the pelletizer, usually made of wear-resistant material. It prevents fine particles and aqueous solutions from directly contacting the pelletizer barrel or disc, extending the life of the equipment. Through reasonable surface design (such as texture, roughness, etc.), the rolling performance of the material is improved and the formation of pellets is promoted. Reduce the need for frequent maintenance and replacement of parts due to wear.

[0004] In the iron and steel metallurgy industry, the mixing pelletizer is an important equipment for preparing pelletized ore. During the pelletizing process, the liner, as a key component of the mixing pelletizer, is in direct contact with the material and is subjected to strong impact, friction, and chemical erosion from the material. With the expansion of production scale and the improvement of production efficiency, the requirements for the working intensity and running time of the pelletizer are getting higher and higher, which makes the wear problem of the liner increasingly prominent.

[0005] Traditional pelletizing machine liners are insufficient in terms of wear resistance and have a short service life. Frequent replacement of liners will not only increase equipment maintenance costs, but also cause interruptions in the production process, affecting production efficiency. In addition, some existing liners have complex processes and high costs during the preparation process, which is not conducive to large-scale application. Therefore, it is of great practical significance to develop a hybrid pelletizing machine liner with high wear resistance, simple preparation process and low cost. Summary of the invention

[0006] The purpose of the present invention is to provide a highly wear-resistant mixing pelletizing machine lining and a preparation method thereof, aiming to solve the problems of insufficient wear resistance and short service life of the existing mixing pelletizing machine linings, and to improve the comprehensive performance of the mixing pelletizing machine lining through composite structure design and special preparation technology.

[0007] To achieve the above-mentioned purpose, the present invention provides a high-wear-resistant mixed pelletizing machine lining, comprising a base layer and a wear-resistant layer composited on the surface of the base layer, wherein the base layer is made of high-strength alloy steel material, and its chemical composition is calculated by mass percentage as follows: C: 0.25-0.35%, Si: 0.4-0.8%, Mn: 1.2-1.6%, Cr: 0.8-1.2%, Mo: 0.2-0.4%, Ni: 0.3-0.6%, Nb: 1.0-1.6%, and the balance is Fe; the wear-resistant layer comprises tungsten carbide particles, a composite alloy material, and an adhesive, and the chemical composition of the composite alloy material is calculated by mass percentage as follows: Cr: 15-20%, Mo: 5-8%, W: 3-5%, C: 0.1-0.2%, Y: 1.2-2.0%, and the balance is Ni.

[0008] Preferably, the volume fraction of the tungsten carbide particles is 30-40%, and the particle size range is between 50-150 μm.

[0009] Preferably, the chemical components in the composite alloy material are all powders with a purity of ≧99% and a particle size of 0.5-1.5 μm.

[0010] Preferably, the adhesive is turpentine.

[0011] The preparation method of the high wear-resistant mixing pelletizing machine liner comprises the following steps:

[0012] Step 1: Preparation of the base layer: accurately weigh the raw materials of each chemical component, add the weighed raw materials of the chemical component into a vacuum induction melting furnace for melting, control the melting temperature and stir them fully during the melting process to make the alloy components evenly distributed, cast the melted alloy liquid into a pre-designed mold, take cooling measures, and heat treat the cast base layer;

[0013] Step 2, preparation of composite alloy material, according to the requirements of chemical composition of composite alloy material, various chemical components are mixed to form alloy mixture, and then the alloy mixture is ground under the protection of nitrogen, the grinding speed is 300rpm, the grinding time is 2h, the alloy mixture is taken out, and then the alloy mixture and the binder are mixed and stirred to form alloy composite material, and then the alloy composite material is heated and melted for 2h under vacuum conditions to obtain composite alloy material;

[0014] Step three, preparation of wear-resistant layer, mixing tungsten carbide particles and composite alloy material evenly, using thermal spraying process to spray the mixture of tungsten carbide particles and composite alloy material onto the surface of base layer, so that tungsten carbide particles are evenly embedded in the composite alloy material coating to form a wear-resistant layer, thus obtaining mixed ball making machine lining.

[0015] Preferably, in step three, the tungsten carbide particles need to be pretreated before being mixed with the composite alloy material. The specific operation of the pretreatment is: the tungsten carbide particles are cleaned, and then the cleaned tungsten carbide particles are dried in an oven at 100-150°C for 2-3 hours to make their water content less than 0.1%, and the dried tungsten carbide particles are surface activated, and a nickel layer with a thickness of 1-3μm is plated on the surface of the tungsten carbide particles by a chemical nickel plating method to improve the bonding strength between the tungsten carbide particles and the nickel-based alloy.

[0016] Preferably, in step three, during the thermal spraying process, the distance between the spray gun and the surface of the base layer is controlled to be 150-200 mm, and the spraying speed is 5-8 m / s.

[0017] Preferably, in step three, the spraying thickness of the wear-resistant layer is 5-12 mm.

[0018] The advantages and beneficial effects of the present invention using the above-mentioned high wear-resistant mixing pelletizing machine liner and the preparation method thereof are:

[0019] 1. The wear-resistant layer of the present invention contains a large amount of tungsten carbide particles. The tungsten carbide particles have extremely high hardness and wear resistance, can effectively resist the wear of materials and grinding media, and greatly improve the wear resistance of the liner.

[0020] 2. The base layer of the present invention adopts high-strength alloy steel, which has good toughness and strength, can withstand the impact load during the operation of the machine, and prevent the liner from breaking under the impact. At the same time, the wear-resistant layer and the base layer form a strong metallurgical bond through the thermal spraying process, so that when the composite liner is impacted, the impact force can be effectively transmitted to the base layer, avoiding the wear-resistant layer from falling off, and ensuring the overall impact resistance of the liner.

[0021] 3. The composite lining of the present invention has high wear resistance and good impact resistance, and its service life is significantly extended. Under the same working conditions, the service life of the composite lining of the present invention is 2-3 times that of the traditional rubber lining, which reduces the number of lining replacements, reduces equipment maintenance costs, and improves production efficiency.

[0022] The technical solution of the present invention is further described in detail below through embodiments. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further illustrated by the following embodiments.

[0024] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0025] Unless otherwise defined, the reagents, equipment and other materials used in the present invention are all commercially available.

[0026] Example 1

[0027] A high wear-resistant mixed pelletizing machine lining comprises a base layer and a wear-resistant layer composited on the surface of the base layer, wherein the base layer is made of high-strength alloy steel material, and its chemical composition is as follows by mass percentage: C: 0.25%, Si: 0.8%, Mn: 1.4%, Cr: 0.8%, Mo: 0.3%, Ni: 0.5%, Nb: 1.2%, and the balance is Fe; the wear-resistant layer comprises tungsten carbide particles, a composite alloy material, and an adhesive, and the chemical composition of the composite alloy material is as follows by mass percentage: Cr: 15%, Mo: 5%, W: 4%, C: 0.1%, Y: 1.3%, and the balance is Ni.

[0028] The volume fraction of the tungsten carbide particles is 32%, and the particle size thereof is 80 μm.

[0029] The chemical components in the composite alloy material are all powders with a purity of ≧99% and a particle size of 0.8 μm.

[0030] The adhesive is turpentine.

[0031] The preparation method of the high wear-resistant mixing pelletizing machine liner comprises the following steps:

[0032] Step 1: Prepare the base layer. Accurately weigh the raw materials of each chemical component, add the weighed raw materials of the chemical component into a vacuum induction melting furnace for melting. During the melting process, control the melting temperature and stir them sufficiently to make the alloy components evenly distributed. Cast the melted alloy liquid into a pre-designed mold, take cooling measures, and heat treat the base layer after casting.

[0033] Step 2, preparation of composite alloy materials, according to the chemical composition requirements of the composite alloy materials, the various chemical components are mixed to form an alloy mixture, and then the alloy mixture is ground under the protection of nitrogen at a speed of 300 rpm for 2 hours. The alloy mixture is taken out, and then the alloy mixture and the binder are mixed and stirred evenly to form an alloy composite material, and then the alloy composite is heated and melted under vacuum conditions for 2 hours to obtain a composite alloy material.

[0034] Step 3: Preparation of wear-resistant layer: clean the tungsten carbide particles, and then dry the cleaned tungsten carbide particles in an oven at 120°C for 2 hours to make its water content less than 0.1%. Perform surface activation treatment on the dried tungsten carbide particles, and use chemical nickel plating to plate a 2μm thick nickel layer on the surface of the tungsten carbide particles to improve the bonding strength between the tungsten carbide particles and the nickel-based alloy.

[0035] The tungsten carbide particles and the composite alloy material are mixed evenly, and the mixture of tungsten carbide particles and the composite alloy material is sprayed onto the surface of the base layer by a thermal spraying process, so that the tungsten carbide particles are evenly embedded in the composite alloy material coating. During the thermal spraying process, the distance between the spray gun and the base surface is controlled at 180 mm, and the spraying speed is 6 m / s to form an 8 mm wear-resistant layer, thereby obtaining a mixed pelletizing machine liner.

[0036] Example 2

[0037] A high wear-resistant mixed pelletizing machine lining comprises a base layer and a wear-resistant layer composited on the surface of the base layer, wherein the base layer is made of high-strength alloy steel material, and its chemical composition is as follows by mass percentage: C: 0.30%, Si: 0.4%, Mn: 1.6%, Cr: 1.0%, Mo: 0.2%, Ni: 0.6%, Nb: 1.5%, and the balance is Fe; the wear-resistant layer comprises tungsten carbide particles, a composite alloy material, and an adhesive, and the chemical composition of the composite alloy material is as follows by mass percentage: Cr: 18%, Mo: 8%, W: 3%, C: 0.15%, Y: 1.5%, and the balance is Ni.

[0038] The volume fraction of the tungsten carbide particles is 38%, and the particle size thereof is 100 μm.

[0039] The chemical components in the composite alloy material are all powders with a purity of ≧99% and a particle size of 1.0 μm.

[0040] The adhesive is turpentine.

[0041] The preparation method of the high wear-resistant mixing pelletizing machine liner comprises the following steps:

[0042] Step 1: Prepare the base layer. Accurately weigh the raw materials of each chemical component, add the weighed raw materials of the chemical component into a vacuum induction melting furnace for melting. During the melting process, control the melting temperature and stir them sufficiently to make the alloy components evenly distributed. Cast the melted alloy liquid into a pre-designed mold, take cooling measures, and heat treat the base layer after casting.

[0043] Step 2, preparation of composite alloy materials, according to the chemical composition requirements of the composite alloy materials, the various chemical components are mixed to form an alloy mixture, and then the alloy mixture is ground under the protection of nitrogen at a speed of 300 rpm for 2 hours. The alloy mixture is taken out, and then the alloy mixture and the binder are mixed and stirred evenly to form an alloy composite material, and then the alloy composite is heated and melted under vacuum conditions for 2 hours to obtain a composite alloy material.

[0044] Step 3: Preparation of wear-resistant layer: clean the tungsten carbide particles, and then dry the cleaned tungsten carbide particles in an oven at 110°C for 2.5 hours to make its water content less than 0.1%. Perform surface activation treatment on the dried tungsten carbide particles, and use chemical nickel plating to plate a 3μm thick nickel layer on the surface of the tungsten carbide particles to improve the bonding strength between the tungsten carbide particles and the nickel-based alloy.

[0045] The tungsten carbide particles and the composite alloy material are mixed evenly, and the mixture of tungsten carbide particles and the composite alloy material is sprayed onto the surface of the base layer by a thermal spraying process, so that the tungsten carbide particles are evenly embedded in the composite alloy material coating. During the thermal spraying process, the distance between the spray gun and the base surface is controlled at 150mm, and the spraying speed is 5m / s to form a 6mm wear-resistant layer to obtain a mixed pelletizing machine liner.

[0046] Example 3

[0047] A high wear-resistant mixed pelletizing machine lining comprises a base layer and a wear-resistant layer composited on the surface of the base layer, wherein the base layer is made of high-strength alloy steel material, and its chemical composition is as follows by mass percentage: C: 0.35%, Si: 0.7%, Mn: 1.5%, Cr: 1.2%, Mo: 0.4%, Ni: 0.6%, Nb: 1.6%, and the balance is Fe; the wear-resistant layer comprises tungsten carbide particles, a composite alloy material, and an adhesive, and the chemical composition of the composite alloy material is as follows by mass percentage: Cr: 18%, Mo: 8%, W: 5%, C: 0.2%, Y: 1.8%, and the balance is Ni.

[0048] The volume fraction of the tungsten carbide particles is 40%, and the particle size thereof is 60 μm.

[0049] The chemical components in the composite alloy material are all powders with a purity of ≧99% and a particle size of 1.2 μm.

[0050] The adhesive is turpentine.

[0051] The preparation method of the high wear-resistant mixing pelletizing machine liner comprises the following steps:

[0052] Step 1: Prepare the base layer. Accurately weigh the raw materials of each chemical component, add the weighed raw materials of the chemical component into a vacuum induction melting furnace for melting. During the melting process, control the melting temperature and stir them sufficiently to make the alloy components evenly distributed. Cast the melted alloy liquid into a pre-designed mold, take cooling measures, and heat treat the base layer after casting.

[0053] Step 2, preparation of composite alloy materials, according to the chemical composition requirements of the composite alloy materials, the various chemical components are mixed to form an alloy mixture, and then the alloy mixture is ground under the protection of nitrogen at a speed of 300 rpm for 2 hours. The alloy mixture is taken out, and then the alloy mixture and the binder are mixed and stirred evenly to form an alloy composite material, and then the alloy composite is heated and melted under vacuum conditions for 2 hours to obtain a composite alloy material.

[0054] Step 3: Preparation of wear-resistant layer: clean the tungsten carbide particles, and then dry the cleaned tungsten carbide particles in an oven at 130°C for 3 hours to make its water content less than 0.1%. Perform surface activation treatment on the dried tungsten carbide particles, and use chemical nickel plating to plate a 1 μm thick nickel layer on the surface of the tungsten carbide particles to improve the bonding strength between the tungsten carbide particles and the nickel-based alloy.

[0055] The tungsten carbide particles and the composite alloy material are mixed evenly, and the mixture of the tungsten carbide particles and the composite alloy material is sprayed onto the surface of the base layer by a thermal spraying process, so that the tungsten carbide particles are evenly embedded in the composite alloy material coating. During the thermal spraying process, the distance between the spray gun and the base surface is controlled at 200 mm, and the spraying speed is 8 m / s to form a 10 mm wear-resistant layer to obtain a mixed pelletizing machine liner.

[0056] Table 1 lists the hardness, abrasion loss weight and service life of the mixing pelletizing machine liner of Examples 1-3.

[0057] Table 1 Performance test results of the liner of the mixing pelletizing machine

[0058] Group <![CDATA[Average hardness (HV 0.2 )]]> Weight loss due to abrasion (mg) Service life (month) Example 1 812 2.1 16 Example 2 798 1.9 18 Example 3 789 2.2 17

[0059] Therefore, the present invention adopts the above-mentioned high wear-resistant mixing pelletizing machine lining and its preparation method, aiming to solve the problems of insufficient wear resistance and short service life of the existing mixing pelletizing machine lining, and improves the comprehensive performance of the mixing pelletizing machine lining through composite structure design and special preparation process.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. High wear-resistant mixing pelletizing machine lining, characterized by: The invention comprises a base layer and a wear-resistant layer compounded on the surface of the base layer, wherein the base layer is made of high-strength alloy steel material, and its chemical composition is calculated by mass percentage as follows: C: 0.25-0.35%, Si: 0.4-0.8%, Mn: 1.2-1.6%, Cr: 0.8-1.2%, Mo: 0.2-0.4%, Ni: 0.3-0.6%, Nb: 1.0-1.6%, and the balance is Fe; the wear-resistant layer comprises tungsten carbide particles, a composite alloy material, and an adhesive, and the chemical composition of the composite alloy material is calculated by mass percentage as follows: Cr: 15-20%, Mo: 5-8%, W: 3-5%, C: 0.1-0.2%, Y: 1.2-2.0%, and the balance is Ni.

2. The high wear-resistant mixing pelletizing machine liner according to claim 1 is characterized in that: The volume fraction of the tungsten carbide particles is 30-40%, and the particle size range is between 50-150 μm.

3. The high wear-resistant mixing pelletizing machine liner according to claim 1 is characterized in that: The chemical components in the composite alloy material are all powders with a purity of ≧99% and a particle size of 0.5-1.5 μm.

4. The high wear-resistant mixing pelletizing machine liner according to claim 1 is characterized in that: The adhesive is turpentine.

5. The method for preparing a highly wear-resistant mixing pelletizing machine liner according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Preparation of the base layer: accurately weigh the raw materials of each chemical component, add the weighed raw materials of the chemical component into a vacuum induction melting furnace for melting, control the melting temperature and stir them fully during the melting process to make the alloy components evenly distributed, cast the melted alloy liquid into a pre-designed mold, take cooling measures, and heat treat the cast base layer; Step 2, preparation of composite alloy material, according to the requirements of chemical composition of composite alloy material, various chemical components are mixed to form alloy mixture, and then the alloy mixture is ground under the protection of nitrogen, the grinding speed is 300rpm, the grinding time is 2h, the alloy mixture is taken out, and then the alloy mixture and the binder are mixed and stirred to form alloy composite material, and then the alloy composite material is heated and melted for 2h under vacuum conditions to obtain composite alloy material; Step three, preparation of wear-resistant layer, mixing tungsten carbide particles and composite alloy material evenly, using thermal spraying process to spray the mixture of tungsten carbide particles and composite alloy material onto the surface of base layer, so that tungsten carbide particles are evenly embedded in the composite alloy material coating to form a wear-resistant layer, thus obtaining mixed ball making machine lining.

6. The method for preparing the high wear-resistant mixing pelletizing machine liner according to claim 5, characterized in that: In step three, the tungsten carbide particles need to be pretreated before being mixed with the composite alloy material. The specific operation of the pretreatment is: the tungsten carbide particles are cleaned, and then the cleaned tungsten carbide particles are dried in an oven at 100-150°C for 2-3 hours to make their water content less than 0.1%, and the dried tungsten carbide particles are surface activated, and a nickel layer with a thickness of 1-3μm is plated on the surface of the tungsten carbide particles by a chemical nickel plating method.

7. The method for preparing the high wear-resistant mixing pelletizing machine liner according to claim 5, characterized in that: In step three, during the thermal spraying process, the distance between the spray gun and the surface of the base layer is controlled to be 150-200 mm, and the spraying speed is 5-8 m / s.

8. The method for preparing the high wear-resistant mixing pelletizing machine liner according to claim 5, characterized in that: In step 3, the spraying thickness of the wear-resistant layer is 5-12 mm.