Wear-resistant stirring blade and method for manufacturing the same

Abstract

To provide a stirring blade for slurry having corrosive and abrasive actions in a stirring reaction tank, which is improved in the adhesion of a ceramic particle-filled epoxy resin applied to the surface thereof to a titanium stirring blade to reduce the repairing frequency thereof, and to provide a method for producing the stirring blade.SOLUTION: A stirring blade 1 for a slurry includes a plurality of stirring plates 11 extending radially around a stirring shaft in a direction perpendicular to the stirring shaft, and a fixing portion for fixing the stirring plate to the stirring shaft, wherein the stirring plate has a rectangular flat plate shape, is fixed to the stirring shaft so as to be inclined with respect to a plane perpendicular to the stirring shaft, and includes a front surface facing a rotation direction of the stirring shaft, a back surface opposite to the front surface, an upper edge connecting the front surface and the back surface, and a lower edge. The wear-resistant stirring blade includes a lining layer of ceramic particle-filled epoxy resin in a region of a predetermined width from an upper edge to a lower edge side among a back surface, the upper edge and a front surface so as to cover an end part of a wall plate, and a stirring plate and the wall plate are made of titanium or a titanium-containing alloy.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wear-resistant agitating blade and a manufacturing method thereof. More specifically, the present invention relates to a wear-resistant agitating blade and a manufacturing method thereof, which are measures against corrosion and wear of agitating blades used for agitating corrosive and abrasive slurries. [Background technology]

[0002] Slurry fluids (hereafter simply referred to as "slurries"), which consist of liquids containing solids, are handled in a variety of plants, including metal smelting plants, pulp and paper plants, and waste treatment plants. Agitators are generally installed in the tanks to maintain the uniformity of the fluids. Furthermore, because the slurry contains solids, it is desirable for the agitator blades to have a surface made of wear-resistant ceramic, etc. However, ceramic alone has little impact resistance, so the agitator blade body is made of metal and the surface is coated with an abrasion-resistant resin lining filled with ceramic particles.

[0003] On the other hand, if the pH value of the liquid that makes up the slurry itself is extremely low (small), or if it is highly corrosive, the carbon steel or stainless steel that is the common metallic material for the impeller cannot withstand the corrosion. In such cases, for example, the impeller body is made from titanium, but titanium has excellent acid resistance and oxidation resistance, but poor wear resistance, so as a solution, an abrasion-resistant resin lining is applied to the surface.

[0004] However, while titanium has the characteristic of forming a strong passive film on its surface, giving it high corrosion resistance, the presence of this film inhibits good adhesion of plating, painting, and resin linings.

[0005] Surface treatment methods exist to improve the adhesion between titanium and resin linings, but these require, for example, the use of strong acids or strong bases or large-scale blasting equipment, and the material must be transported to a manufacturing or repair factory equipped with dedicated large-scale surface treatment tanks, sandblasting equipment, etc., and cannot be carried out on-site within the factory, that is, manufacturing or repair cannot be carried out at the installation location of the agitator or nearby. Patent Document 1 discloses an example of a surface treatment method for titanium-based materials. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2003-073799 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to provide an abrasion-resistant agitator blade equipped with an abrasion-resistant resin lining used in agitators that agitate highly corrosive and abrasive slurries in metal refining plants, which has high corrosion resistance and abrasion resistance and in which the abrasion-resistant resin lining is less likely to peel off from the base material, and a method for manufacturing the same. [Means for solving the problem]

[0008] In order to solve the above problems, the inventors conducted extensive research into the structure of agitator blades, and as a result discovered that by welding titanium plates as wall plates in a lattice pattern to the surface of the front side facing the direction of rotation of a titanium agitator blade that agitates corrosive and abrasive slurry in a stirring reaction vessel and the back side on the opposite side, filling the inside of the lattice with ceramic particle-filled epoxy resin, and further applying ceramic particle-filled epoxy resin to the front edge on the front side facing the direction of rotation of the agitator blade so that it becomes one with the ceramic particle-filled epoxy resin in the lattice, it is possible to obtain better adhesion, which led to the completion of the present invention.

[0009] That is, the first aspect of the present invention is an agitator impeller for agitating highly corrosive and abrasive slurries, the agitator impeller being composed of a plurality of agitator plates extending radially from the agitator shaft in a direction perpendicular to the agitator shaft, and a fixing portion for fixing the agitator plates to the agitator shaft, the agitator plates being rectangular flat plates and fixed at an angle to a plane perpendicular to the agitator shaft, and having a front surface facing the rotation direction of the agitator shaft, a back surface opposite the front surface, an upper edge connecting the front surface and the back surface, and a lower edge, the back surface of the agitator plate is formed with a plurality of wall plates that are erected on the agitator plate and intersect with each other to form a lattice shape, and a ceramic particle-filled epoxy resin lining layer is formed on the back surface, the upper edge, and the front surface of a predetermined width from the upper edge to the lower edge so as to cover the ends of the wall plates, and the agitator impeller and the wall plates are made of titanium or a titanium-containing alloy.

[0010] A second aspect of the present invention is a wear-resistant agitator blade characterized in that the wall plate and the ceramic particle-filled epoxy resin lining layer are formed on the entire back surface of the agitator blade of the first aspect.

[0011] A third aspect of the present invention is a wear-resistant agitator blade, characterized in that the ceramic particle-filled epoxy resin lining layer formed on the back surface in the first and second aspects has a thickness of 1.2 to 3.0 times the standing height of the wall panel.

[0012] A fourth aspect of the present invention is the wear-resistant stirring impeller according to the first aspect, characterized in that the predetermined width is 0.1 to 0.4 times the width of the stirring plate.

[0013] In a fifth aspect of the present invention, there is provided a method for manufacturing an agitator blade for an agitator used to agitate highly corrosive and abrasive slurries, the agitator blade comprising an agitator plate attached to an agitator shaft rotatably arranged in the agitator, the agitator plate being inclined relative to a plane perpendicular to the agitator shaft, the agitator plate being a rectangular, flat titanium or titanium-containing alloy plate having a front surface facing the rotation direction of the agitator shaft, a back surface opposite the front surface, an upper edge connecting the front surface and the back surface, and a lower edge; and a plurality of titanium or titanium-containing alloy wall plates, which intersect with each other to form a lattice shape, are attached to the back surface of the agitator plate so as to stand up from the agitator plate, and a ceramic particle-filled epoxy resin is applied to the back surface, the upper edge, and a region of a predetermined width on the front surface from the upper edge to the lower edge so as to cover the ends of the wall plates. [Effects of the Invention]

[0014] In the present invention, a ceramic particle-filled epoxy resin that combines corrosion resistance and abrasion resistance and is mixed on-site is applied and molded to areas of the agitator plate that are subject to severe abrasion conditions, thereby improving abrasion resistance, extending the life of the agitator blades, and achieving reduced running costs and downtime losses. The present invention can also be applied to protect stirring blades under conditions where only wear resistance is required.

[0015] Therefore, according to the present invention, it is possible to provide an agitator blade equipped with an abrasion-resistant resin lining used in an agitator that agitates highly corrosive and abrasive slurries, which has high corrosion resistance and abrasion resistance and in which the abrasion-resistant resin lining is not easily peeled off from the base material, as well as a method for manufacturing the same, which has a significant industrial effect. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a side view of a wear-resistant stirring blade (1) of the present invention fixed to a stirring shaft (2). [Figure 2]FIG. 1 is a plan view showing a state in which the wear-resistant stirring blade (1) of the present invention is fixed to a stirring shaft (2). [Figure 3] 2. This is a plan view of the wear-resistant stirring blade (1) of the present invention before the ceramic particle-filled epoxy resin (6c) is applied, which corresponds to the area B in FIG. [Figure 4] FIG. 1 is an enlarged view illustrating the lattice-like space formed by the wall plate (5) welded and fixed to the upper blade surface of the stirring plate (11) of the stirring impeller (1). [Figure 5] 3 is a cross-sectional view of the present invention taken along line AA in the direction of the arrow in FIG. 2. [Figure 6] FIG. 2 is a diagram illustrating the thickness of a ceramic particle-filled epoxy resin according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] 1 and 2 show a state in which a wear-resistant agitator blade (1) according to the present invention is fixed to an agitator shaft (2). The wear-resistant agitator blade (1) is composed of, for example, rectangular agitator plates (11) made of titanium or a titanium-containing alloy. As an example, the agitator plates (11) are fixed in a set of four at an angle relative to a plane perpendicular to the agitator shaft (2), and are driven clockwise as viewed from above by a motor (not shown) connected to the agitator shaft (2).

[0018] Figure 3 shows a part of the abrasion-resistant impeller (1) (area B in Figure 2) before the ceramic particle-filled epoxy resin (6c) is applied, Figure 4 shows the lattice-like space created by the wall plate (5) welded to the upper blade surface of the impeller plate (11) of the impeller (1), i.e., the area where the ceramic particle-filled epoxy resin (6a) in Figure 3 is applied, and Figure 5 is a cross-sectional view in the direction of the arrow AA in Figure 2. The stirring plate (11) is made of titanium or a titanium-containing alloy which is corrosion resistant to most liquids and is angled as described above. The upper blade surface of the agitator plate (11) and the leading edge portion thereof in the direction of travel due to rotation of the blade surface are covered with a resin lining layer (6) having the following configuration.

[0019] Specifically, a portion of the lower wing surface, the leading edge, and the upper wing surface are covered with ceramic particle-filled epoxy resins 6a and 6b, and a ceramic particle-filled epoxy resin 6c is applied to the upper side of the ceramic particle-filled epoxy resins 6a and 6b so as to overlap the wall plate 5 in order to integrate the ceramic particle-filled epoxy resins. For ease of explanation, the ceramic particle-filled epoxy resin has been described as being divided into 6a, 6b, and 6c, but this is not a divided structure with boundaries, but rather 6a, 6b, and 6c are an integrated structure with no boundaries.

[0020] More specifically, on the back surface of the agitator plate (11), a plurality of wall plates (5) are formed, which are erected on the agitator plate (11) and intersect with each other to form a lattice shape, and a ceramic particle-filled epoxy resin lining layer is formed on the back surface, the upper edge, and a region of a predetermined width from the upper edge to the lower edge on the front surface so as to cover the ends of the wall plates (5).

[0021] Here, the predetermined width is preferably 0.1 to 0.4 times the width of the agitator blade (11), because if it is less than 0.1 times the width of the agitator blade (11), it becomes difficult to maintain the effect of the agitator blade having high corrosion resistance and wear resistance, which is not preferable, and if it exceeds 0.4 times the width of the agitator blade (11), it is not preferable from the viewpoint of manufacturing costs. The effect of "forming a grid-like structure" is thought to be due to the "penetration effect" on the lining layer and the "reduction of stress density due to the dispersion of load stress caused by dividing it into grid-like sections." More specifically, the influencing factors are considered to be as follows: 1. Pattern shape: Polygonal (e.g., honeycomb structure, diamond structure, square structure, etc.) 2. Cross-sectional shape of the dividing member: A shape that allows a wedge to act (for example, an inverted trapezoidal cross-sectional structure) 3. Attributes of the dividing material: Use of wire material (use of wire material such as cross-section square wire and cross-section circle wire, either alone or mixed)

[0022] Therefore, in an embodiment of the present invention, a plurality of wall plates (5) are provided on the back surface of the agitator plate (11) and intersect with each other to form a lattice shape. However, the "lattice shape" of the present invention does not necessarily mean a square cell formed by four wall plates (5) intersecting at right angles, but also includes a hexagonal honeycomb structure. Furthermore, the thickness of the wall plates (5) may gradually increase in the direction away from the agitator plate (11), and holes may be drilled in the wall plates (5) to allow the epoxy resin to penetrate the wall plates (5). Furthermore, in addition to the formation of a plurality of wall plates (5) that are provided on the back surface of the agitator plate (11) and intersect with each other to form a lattice shape, the use of additional wire rods is not precluded.

[0023] In addition, in order to protect the upper blade surface of the stirring plate (11), the ceramic particle-filled epoxy resin (6a) is filled into the lattice-like space formed by the titanium plates of the wall plate (5) welded upright onto the titanium stirring plate (11), as shown in Figures 3 and 4.

[0024] In addition, the ceramic particle-filled epoxy resin (6b) is applied to the leading edge of the agitator plate (11) in the direction of travel as it rotates, as shown in Figures 3 and 5.

[0025] Furthermore, the ceramic particle-filled epoxy resin (6c) is applied to cover the upper sides of the ceramic particle-filled epoxy resins (6a) and (6b) in order to integrate the ceramic particle-filled epoxy resins (6a) and (6b), as shown in FIG. 5. The thickness of these ceramic particle-filled epoxy resins is preferably set so that the total thickness of these resins is 1.2 to 3.0 times the standing height H of the wall panel (5), as shown in FIG. [Example]

[0026] The present invention will be described in more detail below using examples. [Example]

[0027] A nickel-based chloride solution having an ore slurry concentration of 200 to 300 g / L, a particle size of 10 to 20 μm, and a nickel sulfide as the main component, at a temperature of 60 to 100°C and a pH of 1 to 2, was placed in a stirring reaction vessel, and the chloride solution was stirred in the stirring reaction vessel using the stirring impeller (1) according to the present invention shown in Figures 1 to 6, in which the resin lining layer (6) made of ceramic particle-filled epoxy resins (6a), (6b), and (6c) had a total thickness of 1.2 to 3.0 times the standing height of the wall panel (5).

[0028] (Conventional example) The same chloride solution as in Example 1 was stirred using the same stirring impeller as in the present invention, except that it did not have a wall plate erected on the upper surface of the impeller surface according to the present invention.

[0029] As a result, with conventional mixing blades (conventional example), most of the ceramic particle-filled epoxy resin on the surface fell off after two or three months of continuous use, making it necessary to completely renew the blade by reapplying ceramic particle-filled epoxy resin. However, when the stirring impeller (1) (Example) of the present invention having the above-mentioned configuration was used, the ceramic particle-filled epoxy resin did not fall off even after six months of continuous use, and partial repair by reapplication was sufficient, thereby extending the life of the stirring impeller (1) and eliminating the need for operation suspension for repairs. [Explanation of symbols]

[0030] 1 stirring blade 2 stirring shafts 5 wall board 6 Resin lining layer 6a, 6b, 6c Ceramic particle filled epoxy resin 11 Stirring plate B area H: Height of wall panel (5)

Claims

1. An agitator blade for agitating a highly corrosive and abrasive slurry, The stirring blade is The stirring plate is configured by a plurality of stirring plates extending radially from the stirring shaft in a direction perpendicular to the stirring shaft, and a fixing portion that fixes the stirring plate to the stirring shaft, The stirring plate is a rectangular flat plate, The stirring shaft is fixed at an angle relative to a plane perpendicular to the stirring shaft, The stirring shaft has a front surface facing the rotation direction, a back surface opposite to the front surface, an upper edge connecting the front surface and the back surface, and a lower edge; A plurality of wall plates are formed on the back surface of the stirring plate, and are erected on the stirring plate and cross each other to form a lattice shape. A ceramic particle-filled epoxy resin lining layer is formed on the back surface, the upper edge, and a region of a predetermined width from the upper edge to the lower edge of the front surface so as to cover the ends of the wall plates. The stirring plate and wall plate are made of titanium or a titanium-containing alloy. A wear-resistant agitating blade characterized by:

2. 2. The wear-resistant agitating blade according to claim 1, wherein the wall plate and the ceramic particle-filled epoxy resin lining layer are formed on the entire back surface.

3. A wear-resistant agitator blade as described in claim 1 or 2, characterized in that the ceramic particle-filled epoxy resin lining layer formed on the back surface has a thickness of 1.2 to 3.0 times the upright height of the wall panel.

4. 2. The wear-resistant stirring blade according to claim 1, wherein the predetermined width is 0.1 to 0.4 times the width of the stirring plate.

5. A method for manufacturing an agitator blade for an agitator that agitates highly corrosive and abrasive slurries, comprising: The stirring blade comprises a stirring plate attached and fixed to a stirring shaft rotatably arranged in the stirrer in a manner in which the stirring blade is fixed at an angle with respect to a plane perpendicular to the stirring shaft, The stirring plate is a rectangular flat titanium or titanium-containing alloy plate, The stirring shaft has a front surface facing the rotation direction, a back surface opposite the front surface, an upper edge connecting the front surface and the back surface, and a lower edge; A method for manufacturing a wear-resistant agitator blade, characterized in that a plurality of wall plates made of titanium or a titanium-containing alloy, which intersect with each other to form a lattice shape, are attached to the back surface of the agitator plate so that they stand up from the agitator plate, and a ceramic particle-filled epoxy resin is applied to the back surface, the upper edge, and a region of a predetermined width from the upper edge to the lower edge of the front surface so as to cover the ends of the wall plates.

Images