A method for repairing a damaged surface of a spiral chute body

Abstract

The present application relates to a kind of repair methods of heavy selection spiral chute body broken surface, and its steps are as follows: the inner and outer inclined surface of chute body broken part is cleaned, the inner and outer inclined surface of chute body broken part is polished and residual particles are removed using angle grinder, then first along the outer inclined surface of chute body broken part, brush and cover the outer surface repair layer composed of mixed glue and glass fiber, then select the diamond wear-resistant material made of epoxy resin glue, curing agent, diamond wear-resistant particles and lime powder to repeatedly and evenly carry out multi-layer scraping treatment from bottom to top on the inner inclined surface of chute body broken part, form wear-resistant layer;After wear-resistant layer is completely cured, polishing treatment is carried out, and finally the outer surface repair layer after repair is painted.The chute body broken part of heavy selection spiral chute is repaired using the method of the present application, and the strength and wear resistance of the original chute body are the same, and the maintenance cost and labor intensity are reduced.

Description

Technical Field

[0001] This invention relates to the field of mineral processing equipment technology, and in particular to a damaged surface of a gravity separation spiral chute.

[0002] Repair methods. Background Technology

[0003] Spiral sluices are a type of gravity separation equipment. They are not limited to iron ore beneficiation; in my country, they are also widely used for manganese ore, coal, rare metals, and non-metallic ores such as diamonds and kaolin. Spiral sluices are primarily made of fiberglass reinforced plastic (FRP). The equipment itself has no transmission parts, making it easy to operate and providing stable performance. However, it also has certain drawbacks. For example, the equipment has a large height difference, reaching 6-7 meters, requiring a three-layer steel structure operating platform. Even if a single unit needs to be replaced, the operating platform must be dismantled along with the sluice to lift it out. After installation, a new three-layer steel structure platform needs to be laid. Furthermore, a large number of spiral sluices are required in concentrators. For instance, the Qidaishan concentrator, producing 3000 tons of iron concentrate per day, requires 108 spiral sluices, significantly increasing maintenance costs. Damage to spiral chutes during operation primarily occurs because the mineral particles within the chute are separated under the combined effects of friction, centrifugal force, and hydrodynamics. This results in a slurry that continuously rubs and impacts the chute body. Due to the higher centrifugal force and faster flow velocity of the slurry at the outer edge of the chute, varying degrees of damage occur, causing slurry spillage. This leads to significant metal loss and environmental pollution. Furthermore, if there are multiple leaks, the equipment must be shut down and cannot operate. Therefore, repairing these defects is crucial.

[0004] Currently, professional maintenance personnel mainly use 1mm thick iron plates to fix the spiral chute to the trough body with rivets, and fill the gaps with solid glue to achieve the purpose of sealing. However, because the cross-sectional shape of the spiral chute is a cubic parabola, the outer edge of the trough body has a large curvature, causing the iron plate to not fit well with the trough body, and it is about 3mm higher than the inner surface of the trough body. This results in obstructed ore flow, turbulence, and unclear stratification and zoning.

[0005] This affects the sorting effect. Additionally, if the damaged area reaches 10cm... 2 If the tank body is worn thin in both the transverse and longitudinal directions, the rivets cannot properly fix the iron plate to the tank body, making repair impossible and forcing the equipment to be shut down. Furthermore, due to the poor adhesion and corrosion resistance of the three base materials (iron plate, tank body, and solid adhesive), prolonged slurry erosion will cause leakage again, failing to achieve a perfect repair. However, this invention is not limited by the size of the damaged area, and the sorting effect and wear resistance after repair are the same as those of a new tank body. In addition, the raw materials are widely available and easy to operate and master. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, the present invention aims to provide a method for repairing the damaged surface of a gravity separation spiral chute, which is simple to operate and construct, uses inexpensive and widely available raw materials, and has high strength and wear resistance.

[0007] The objective of this invention is achieved as follows: A method for repairing damage to a gravity separation spiral chute body is characterized by using epoxy resin, a curing agent, corundum wear-resistant particles, lime powder, and fiberglass cloth as materials for repairing the damaged parts of the chute body. Simultaneously, a grinding machine, a tungsten lamp, and a scraper are used to repair the gravity separation spiral chute body. The specific steps are as follows:

[0008] Cleaning treatment

[0009] 1.1) Clean the inner and outer inclined surfaces of the damaged parts of the gravity separation spiral chute to remove the silt from the surface;

[0010] 1.2) Use a grinder to grind the inner and outer inclined surfaces of the damaged parts of the tank and remove residual particles to improve the bonding adhesion;

[0011] 2) Repair of the outward tilting surface of the damaged part of the tank.

[0012] 2.1) Material Preparation

[0013] 2.1.1) Use an electric furnace to dewax the fiberglass cloth for 1-2 minutes;

[0014] 2.1.2) Measure the epoxy resin adhesive and curing agent at a volume ratio of 1:1 and stir them evenly to prepare a mixed adhesive;

[0015] 2.2) Repair

[0016] 2.2.1) First, use a tungsten lamp to heat and dehumidify the outer inclined surface of the damaged part of the tank for 10-15 minutes;

[0017] 2.2.2) Use a brush to apply and cover multiple layers of the mixed adhesive and glass fiber on the outer inclined surface of the damaged part of the tank. After each layer of the outer surface repair layer is completed, wait for it to dry before applying the next layer of mixed adhesive and covering with glass fiber.

[0018] 3) Repair of the inner surface of the damaged parts of the tank

[0019] 3.1) Material Preparation

[0020] Epoxy resin adhesive, curing agent and corundum wear-resistant particles are mixed in a volume ratio of 1:1:2, and then lime powder is added to adjust the concentration of corundum wear-resistant material to 80% for later use.

[0021] 3.2) Repair

[0022] Using a scraper dipped in diamond abrasive, the inner inclined surface of the damaged part of the tank is repeatedly and evenly scraped and pressed in multiple layers from bottom to top to form a wear-resistant layer with a thickness of 1.5-2 mm.

[0023] 4) After construction is completed, wait for eight hours until the wear-resistant layer is completely cured. Then, use a small hand grinder to grind the edges of the wear-resistant layer at the repaired area until the wear-resistant layer and the inner inclined surface of the groove are smoothly and horizontally transitioned.

[0024] 5) Finally, apply paint to the repaired outer surface layer to prevent oxidation.

[0025] As a preferred technical solution of the present invention, the covering layer for repairing the outer inclined surface of the damaged part of the tank is 5-7 layers.

[0026] As a preferred technical solution of the present invention, the thickness of each layer of diamond abrasion-resistant material is 0.5-1 mm.

[0027] As a preferred technical solution of the present invention, if it is necessary to shorten the curing time and quickly transfer the vehicle for use, after the construction is completed, use a tungsten lamp to radiate heat the outer surface of the tank, keeping the distance at 500-800mm, and the curing time is 3-4 hours to achieve complete curing.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] The method of this invention is used to repair damaged parts of the gravity separation spiral chute. It is not only easy to operate and construct, but also the raw materials are inexpensive and widely available. At the same time, the repair material has the same composition as the chute material. After repair, the strength and wear resistance are the same as the original chute, or even higher, which reduces maintenance costs and labor intensity. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the repaired damaged parts of the gravity separation spiral chute according to the present invention. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figure 1As shown, the present invention discloses a method for repairing damage to a gravity separation spiral chute. The method is characterized by using epoxy resin, a curing agent, corundum wear-resistant particles, lime powder, and fiberglass cloth as materials for repairing the damaged parts of the chute. Simultaneously, a grinder, angle grinder, tungsten lamp, and scraper are used to repair the damaged parts of the gravity separation spiral chute. The specific steps are as follows:

[0033] 1) Cleaning treatment,

[0034] 1.1) Clean the inner and outer inclined surfaces of the damaged parts of the gravity separation spiral chute to remove the silt from the surface;

[0035] 1.2) Use an angle grinder to grind the inner and outer inclined surfaces of the damaged area and remove residual particles to improve the bonding adhesion;

[0036] 2) Repair of the outer inclined surface 2 of the damaged part of the tank.

[0037] 2.1) Material Preparation

[0038] 2.1.1) Use an electric furnace to dewax the fiberglass cloth 4 for 1-2 minutes;

[0039] 2.1.2) Measure and mix epoxy resin adhesive E44 and epoxy resin adhesive curing agent Be51 at a volume ratio of 1:1 to prepare mixed adhesive 3;

[0040] 2.2) Repair

[0041] 2.2.1) First, use a tungsten lamp to heat and dehumidify the outer inclined surface 2 of the damaged part of the tank for 10 minutes, with a heating distance of 500-600mm;

[0042] 2.2.2) Use a brush to apply the mixed adhesive 3 along the outer inclined surface 2 of the damaged part of the tank and cover it with multiple layers of the outer surface repair layer composed of mixed adhesive 3 and glass fiber 4. After each layer of outer surface repair layer is completed, wait for it to dry before applying the next layer of mixed adhesive 3 and covering it with glass fiber 4. The covering layer for repairing the outer inclined surface 2 of the tank is preferably 6 layers.

[0043] 3) Repair of the inner surface 1 of the damaged part of the tank.

[0044] 3.1) Material Preparation

[0045] An epoxy resin adhesive E44, epoxy resin adhesive curing agent Be51, and diamond abrasive particles with a particle size of -200 mesh and above 90% are mixed in a volume ratio of 1:1:2. Then, lime powder is added to adjust the concentration to 80% diamond abrasive material 5 for later use. The diamond abrasive particles have a particle size of -200 mesh and above 90%.

[0046] 3.2) Repair

[0047] Using a scraper dipped in diamond abrasive wear-resistant material 5, the inner inclined surface 1 of the damaged part of the tank is repeatedly and evenly scraped and pressed in multiple layers from bottom to top. The thickness of each layer of diamond abrasive wear-resistant material 5 is 0.5-1 mm, forming a wear-resistant layer with a thickness of 1.5-2 mm.

[0048] 4) After construction is completed, wait for eight hours until the wear-resistant layer is completely cured. Then, use a small hand grinder to grind the edges of the wear-resistant layer at the repaired area until the wear-resistant layer and the inner inclined surface of the groove are smoothly and horizontally transitioned.

[0049] To shorten the curing time and quickly transfer the equipment, after construction, use a tungsten lamp to radiate heat the outer surface of the tank, keeping the distance 500-800mm, for 3-4 hours to fully cure;

[0050] 5) Finally, apply paint to the repaired outer surface layer to prevent oxidation.

[0051] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made to the structure, shape, principle and method of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for repairing the damaged surface of a gravity separation spiral chute, characterized in that, Epoxy resin, curing agent, corundum wear-resistant particles, lime powder, and fiberglass cloth were used as materials for repairing the damaged parts of the trough. A grinding machine, tungsten lamp, and scraper were employed to repair the gravity separation spiral chute. The specific steps are as follows: 1) Cleaning treatment, 1.1) Clean the inner and outer inclined surfaces of the damaged parts of the gravity separation spiral chute to remove the silt from the surface; 1.2) Use a grinder to grind the inner and outer inclined surfaces of the damaged parts of the tank and remove residual particles to improve the bonding adhesion; 2) Repair of the outward tilting surface of the damaged part of the tank. 2.1) Material Preparation 2.1.1) Use an electric furnace to dewax the fiberglass cloth for 1-2 minutes; 2.1.2) Measure the epoxy resin adhesive and curing agent at a volume ratio of 1:1 and stir them evenly to prepare a mixed adhesive; 2.2) Repair 2.2.1) First, use a tungsten lamp to heat and dehumidify the outer inclined surface of the damaged part of the tank for 10-15 minutes; 2.2.2) Use a brush to apply and cover multiple layers of the mixed adhesive and glass fiber on the outer inclined surface of the damaged part of the tank. After each layer of the outer surface repair layer is completed, wait for it to dry before applying the next layer of mixed adhesive and covering with glass fiber. 3) Repair of the inner surface of the damaged parts of the tank 3.1) Material Preparation Epoxy resin adhesive, curing agent and corundum wear-resistant particles are mixed in a volume ratio of 1:1:2, and then lime powder is added to adjust the concentration of corundum wear-resistant material to 80% for later use. 3.2) Repair Using a scraper dipped in diamond abrasive, the inner inclined surface of the damaged part of the tank is repeatedly and evenly scraped and pressed in multiple layers from bottom to top to form a wear-resistant layer with a thickness of 1.5-2 mm. 4) After construction is completed, wait for eight hours until the wear-resistant layer is completely cured. Then, use a small hand grinder to grind the edges of the wear-resistant layer at the repaired area until the wear-resistant layer and the inner inclined surface of the groove are smoothly and horizontally transitioned. 5) Finally, apply paint to the repaired outer surface layer to prevent oxidation.

2. The method for repairing the damaged surface of the gravity separation spiral chute body according to claim 1, characterized in that, The covering layer for repairing the outer inclined surface of the damaged part of the tank is 6-7 layers.

3. The method for repairing the damaged surface of the gravity separation spiral chute body according to claim 1, characterized in that, When repairing the damaged outer inclined surface of the tank, first use a tungsten lamp to heat and dehumidify the outer inclined surface of the tank at a distance of 50-60cm.

4. The method for repairing the damaged surface of the gravity separation spiral chute body according to claim 1, characterized in that, The thickness of each layer of diamond abrasion-resistant material is 0.5-1 mm.

5. The method for repairing the damaged surface of the gravity separation spiral chute body according to claim 1, characterized in that, To shorten the curing time and quickly transfer the equipment, after construction, use a tungsten lamp to radiate heat the outer surface of the tank, keeping the distance 500-800mm, for 3-4 hours to fully cure.

6. The method for repairing the damaged surface of the gravity separation spiral chute body according to claim 1, characterized in that, The epoxy resin adhesive is epoxy resin adhesive e44, and the curing agent is epoxy resin adhesive curing agent e51.

7. The method for repairing the damaged surface of the gravity separation spiral chute body according to claim 1, characterized in that, The particle size of the diamond abrasive particles is 90% or more of -200 mesh.

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