Inserting drill pipe for laterite-nickel ore smelting furnace

Abstract

The utility model discloses a drill rod inserting pipe for a laterite-nickel ore smelting furnace, and belongs to the technical field of metallurgical machinery. Comprising a steel pipe body, a plurality of cutting lines are machined on the pipe wall of the pipe body, and a fin plate capable of being unfolded outwards is formed by one cutting line. When the drill rod inserting pipe is not installed and used, the fin plates formed by the cutting lines cannot be unfolded, and the whole drill rod inserting pipe is still kept tubular in appearance. When the drill rod inserting pipe is installed on a drill rod inserting mechanism for use, in the downward inserting process of the drill rod inserting pipe, the fin plates are gradually unfolded under the resistance and thermal expansion action of materials in a furnace, and the fin plates forming a certain angle with the axis of the drill rod inserting pipe are formed on the pipe wall. The device is simple to process, convenient to use, safe, reliable, low in cost and easy to store and transport, and is a preferable accessory of a matched drill rod inserting mechanism of the laterite-nickel ore smelting furnace.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical machinery, and particularly relates to a plugging pipe for a laterite nickel ore smelting furnace, which is suitable for being installed on a plugging mechanism supporting the laterite nickel ore smelting furnace for use. Background Art

[0002] At present, the metallurgical furnaces used in the nickel-iron pyrometallurgy industry are mainly submerged arc furnaces and side-blown furnaces. The smelting process is to send the laterite nickel ore with 25% - 40% water content through rotary kiln drying dehydration and pre-reduction treatment, and then send it into an electric furnace for further reduction and melting. It is melted and separated into nickel metal and slag at a high temperature of 1450°C - 1600°C in the electric furnace. During the melting and smelting process of laterite nickel ore, accidents such as the collapse of the material layer in the furnace and slag turning often occur. Analyzing the reasons, it is because the air permeability of the material layer in the furnace is poor, and the furnace charge is sintered into large pieces of viscous furnace charge, resulting in bridging and hollowing. When the furnace charge is melted to a certain extent, it will cause the collapse of the material layer and slag turning, resulting in the fire spraying from the furnace top and even the explosion of the furnace body, which is very dangerous. In the industry, the measures to reduce such accidents are generally to increase the raw material temperature, control the material layer thickness, control the electrode power and the electrode dropping speed, etc., but it often leads to a significant increase in the operation difficulty and production cost.

[0003] The Chinese invention patent with the publication number of CN114001552A discloses a multi-purpose furnace top plugging mechanism and method for a nickel-iron smelting submerged arc furnace, which can well solve the problem of slag turning of materials during the melting and smelting process of laterite nickel ore. However, its plugging pipe fittings have a complex structure, high manufacturing cost, and are easy to be damaged. To solve these problems, the utility model has studied a plugging pipe for a laterite nickel ore smelting furnace, which is installed on a plugging mechanism supporting the laterite nickel ore smelting furnace for use. Content of the Utility Model

[0004] The purpose of the utility model is to provide a plugging pipe for a laterite nickel ore smelting furnace. Special cutting lines are processed on the steel plugging pipe wall. When it is not installed and used, the fin plates formed by these cutting lines will not unfold; when the plugging pipe is installed on the plugging mechanism for use, during the process of inserting the plugging pipe downward, the fin plates gradually unfold into a fin-shaped structure due to the resistance of the materials in the furnace and the thermal expansion effect. This plugging pipe has the characteristics of simple processing, convenient use, low cost, easy storage and transportation, etc., and is an optimal fitting for the plugging mechanism supporting the laterite nickel ore smelting furnace. Thus, the problems raised in the above background art are solved.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A plugging pipe for a laterite nickel ore smelting furnace includes a pipe body 1, and a plurality of cutting lines 2 are processed on the wall of the pipe body 1, and one cutting line 2 forms a fin plate 3 that can unfold outward.

[0007] The pipe body 1 is made of steel pipe, and its structure is a round pipe or a rectangular pipe; when it is a round pipe, the diameter of the round pipe is Φ20 - 200 mm; when it is a rectangular pipe, the side length of the cross-section of the rectangular pipe is 20 - 200 mm, and the wall thickness is 5 - 50 mm.

[0008] The cutting line 2 is one or a combination of U-shaped, C-shaped and V-shaped.

[0009] The lower end of the pipe body 1 is provided with an internal chamfer 4, and the angle of the internal chamfer 4 is 30 - 60 degrees.

[0010] The cutting line 2 penetrates through the pipe wall of the pipe body 1.

[0011] The cutting line 2 does not penetrate through the pipe wall of the pipe body 1, and its cutting depth is greater than half of the pipe wall thickness of the pipe body 1.

[0012] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are:

[0013] In the present utility model, special cutting lines are processed on the wall of the steel plugging rod. When not installed and used, the fin plates formed by these cutting lines will not unfold; when the plugging rod pipe is installed on the plugging mechanism for use, during the process of inserting the plugging rod pipe downward, the fin plates gradually unfold into a fin-shaped structure due to the resistance of the materials in the furnace and the thermal expansion effect. With the reciprocating movement of the plugging mechanism, the fin plates increase the stirring area of the materials, and at the same time enable the gas inside the materials to be discharged through the plugging rod pipe and the pores formed by the plugging rod pipe, further improving the safety of the submerged arc furnace, reducing the requirements for materials, making the production operation smooth, and reducing production accidents. In summary, the present utility model is simple to process, convenient to use, safe and reliable, low in cost, easy to store and transport, and is an optimal accessory for the plugging mechanism supporting the laterite nickel ore smelting furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of the pipe body of the present utility model when it is a rectangular pipe;

[0015] Figure 2 It is a schematic structural diagram of the pipe body of the present utility model when it is a round pipe;

[0016] Figure 3 It is the front view of the present utility model;

[0017] Figure 4 is Figure 3 a sectional view of the dot-shaped cutting line at A;

[0018] As shown in the figure: pipe body 1; cutting line 2; fin plate 3; internal chamfer 4. DETAILED DESCRIPTION OF THE INVENTION

[0019] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0022] Embodiment

[0023] As Figures 1 - 4 , this embodiment provides a plugging pipe for a laterite nickel ore smelting furnace, which includes a steel pipe body 1. A plurality of cutting lines 2 are processed on the wall of the pipe body 1, and one cutting line 2 forms a wing plate 3 that can expand outwards. When not installed and used, the wing plates formed by these cutting lines will not expand, and the entire plugging pipe still maintains a tubular shape in appearance; when the plugging pipe is installed on the plugging mechanism for use, during the process of inserting the plugging pipe downwards, the wing plates gradually expand due to the resistance of the materials in the furnace and the thermal expansion effect, and wing plates 3 with a certain angle to the axis of the plugging pipe are formed on the pipe wall.

[0024] The pipe body 1 is a steel pipe, and its structure is a circular pipe or a rectangular pipe; when it is a circular pipe, the diameter of the circular pipe is Φ20 - 200 mm; when it is a rectangular pipe, the side length of the cross-section of the rectangular pipe is 20 - 200 mm, and the wall thickness is 5 - 50 mm.

[0025] The cutting line 2 is one or a combination of U-shaped, C-shaped and V-shaped. The cutting line 2 can cut through the wall 2 of the pipe body 1, or it can not cut through the wall of the pipe body 1. When it does not cut through, its cutting depth is greater than half of the wall thickness of the pipe body 1.

[0026] The length of the cutting line 2 along the axial direction of the drill pipe is 20 - 200 mm, and the radial width is 10 - 100 mm. The axial spacing between each group of cutting lines 2 is 50 - 300 mm, and the radial spacing is 30 - 100 mm.

[0027] An internal chamfer 4 is provided at the lower end of the pipe body 1, and the angle of the internal chamfer 4 is 30 - 60 degrees.

[0028] The processing technology of the cutting line 2 can be one or more of stamping, rolling, laser cutting, and water jet cutting. The cutting line can be a continuous linear type, or a linear type spaced into several small segments, or a continuous dot type.

[0029] The utility model can be used on the drill pipe mechanism supporting the submerged arc furnace in the RKEF process line of laterite nickel ore smelting, or can also be used on the drill pipe mechanism supporting the top blown furnace of laterite nickel ore. The upper part of this drill pipe is installed on the drill pipe mechanism. According to the structural characteristics of the drill pipe mechanism, the upper connection method adopts flange connection with the drill pipe mechanism or thread connection with the drill pipe mechanism. The drill pipe can be a drill pipe 1 made of steel pipe with special cutting lines 2 processed on its pipe wall. The cutting line 2 is a wide-bottom V shape (such as Figure 2 ), and the cutting line 2 penetrates the pipe wall. When not installed and used, the fin plates formed by these cutting lines will not unfold; the drill pipe can also be a drill pipe 1 made of square steel with special cutting lines 2 processed on its pipe wall. The cutting line is a U shape (such as Figure 1 ), the cutting depth of the cutting line is 90% of the pipe wall thickness, and it is a continuous dot-shaped stamping point ( Figure 3 , a is the pipe wall thickness, and b is the depth of the dot-shaped cutting line). When not installed and used, the fin plates formed by these cutting lines will not unfold. When the drill pipe is installed on the drill pipe mechanism for use, during the process of inserting the drill pipe downward, due to the formation of a small bell mouth at the chamfer 4, it not only facilitates the insertion of the drill pipe into the material layer, but also helps the material to form a squeezing force in the cavity of the drill pipe. The fin plates gradually unfold under the squeezing force and thermal expansion effect of the material, and form fin plates 3 with a certain angle with the axis of the drill pipe on the pipe wall. These unfolded fin plates 3 increase the stirring area of the material with the reciprocating movement of the drill pipe mechanism, and at the same time enable the gas inside the material to be discharged in the drill pipe and the pores formed by the drill pipe, further improving the safety of the submerged arc furnace, reducing the material requirements, making the production operation smooth, and reducing production accidents.

Claims

1. A plugging pipe for a laterite nickel ore smelting furnace, comprising a pipe body (1), characterized in that, A plurality of cutting lines (2) are machined on the wall of the pipe body (1), and one cutting line (2) forms a wing plate (3) that can be unfolded outwards.

2. The plugging pipe for a laterite nickel ore smelting furnace according to claim 1, characterized in that: The pipe body (1) is a steel pipe, and its structure is a circular pipe or a rectangular pipe; when it is a circular pipe, the diameter of the circular pipe is Φ20 - 200 mm; when it is a rectangular pipe, the side length of the cross-section of the rectangular pipe is 20 - 200 mm, and the wall thickness is 5 - 50 mm.

3. The plugging pipe for a laterite nickel ore smelting furnace according to claim 1, characterized in that: The cutting line (2) is one or a combination of more than one of U-shaped, C-shaped, and V-shaped.

4. A plugging pipe for a laterite nickel ore smelting furnace according to claim 1, characterized in that: An internal chamfer (4) is provided at the lower end of the pipe body (1), and the angle of the internal chamfer (4) is 30 - 60 degrees.

5. A plugging pipe for a laterite nickel ore smelting furnace according to claim 1, characterized in that: The cutting line (2) penetrates through the wall of the pipe body (1).

6. A plugging pipe for a laterite nickel ore smelting furnace according to claim 1, characterized in that: The cutting line (2) does not penetrate through the wall of the pipe body (1), and its cutting depth is greater than half of the wall thickness of the pipe body (1).

Images