CN115334703A - Electrode cylinder for reducing soft-hard segment accidents during roasting of self-baking electrode of ore-smelting electric furnace and preparation method thereof - Google Patents

Abstract

The electrode cylinder and its preparation for reducing soft and hard section accidents during self-baking electrodes of submerged thermal electric furnaces belong to the technical field of self-baking electrodes for non-ferrous metallurgical submerged thermal electric furnaces.

The round steel is used to strengthen the core of the electrode cylinder, which has reached the purpose of strengthening its own structural strength and central conductivity, so as to accelerate the sintering speed of the electrode core, and prevent the problem of disconnection and core pulling between the electrode paste and the electrode cylinder when the electrode is pressed. , and the weld cracking and leakage of the electrode cylinder, etc., to reduce the occurrence of soft and hard breakage of the electrode during electrode firing.

Description

Electrode cylinder and its preparation for reducing soft and hard section accidents during self-baking electrodes of submerged heat electric furnace

technical field

The invention belongs to the technical field of self-baking electrodes of submerged thermal electric furnaces for nonferrous metallurgy, and in particular relates to a method for reducing soft and hard fracture accidents of electrodes during self-baking electrodes of submerged thermal electric furnaces.

Background technique

The electrode is the core component in the production of the submerged thermal electric furnace. The self-baking electrode is composed of the electrode cylinder and the electrode paste added to the electrode cylinder. The role of the electrode cylinder as a container for electrode sintering is: to bear the weight of the electrode and to withstand part of the current , Protect the working end of the electrode from premature oxidation, make the electrode paste baked in the shell through resistance heat, conduction heat and radiation heat, etc. Due to the continuous consumption of the electrode under the action of the arc at the end, it is necessary to continuously weld the upper part of the electrode cylinder to lengthen the electrode cylinder, and continuously add electrode paste into the electrode cylinder to form a self-baking electrode for continuous production. The electrode paste undergoes three stages of change during sintering into an electrode. In the softening stage and the volatilization stage, the electrode cylinder and the inner ribs of the cylinder play a conductive role, bear part of the current and the sintered electrode working end and electrode cylinder The weight of the electrode paste without sintering inside, all the pulling force generated by these weights acts on the electrode cylinder and is completely borne by the electrode cylinder. If the welding strength between the electrode cylinders is not enough, there will be cracking and leakage of the weld seam, and even an accident of soft and hard breaking of the electrode.

Contents of the invention

The technical problem to be solved by the present invention is: to provide the electrode cylinder and its preparation for reducing the soft and hard section accidents when the self-baking electrode of the submerged electric furnace is roasted, to strengthen its own structural strength and central conductivity, to accelerate the sintering speed of the electrode core, and to prevent Disconnection of the electrode paste and the electrode cylinder and core pulling problems during electrode pressing, as well as problems such as cracking and leakage of the weld seam of the electrode cylinder, reduce accidents such as soft and hard breakage of the electrode during electrode firing.

The electrode cylinder is characterized in that it includes more than one section of the electrode cylinder, and each section of the electrode cylinder includes a shell, a rib plate and a round steel, and the shell is cylindrical; There are eight ribs, which are evenly arranged inside the shell; the round steel is welded on the edge of the rib, and the two ends of the round steel are provided with U-shaped hooks, and the U-shaped hooks of the round steel are connected to each other; The shell of the electrode cylinder is connected by welding, and the length of the two electrode cylinders connected is the same as the length of a round steel.

The preparation of the soft and hard section accident electrode cylinder during the self-baking electrode of the submerged heat electric furnace is characterized in that it includes the following steps, and the following steps are carried out in sequence,

Step 1. Weld the round steel with U-shaped hooks at both ends to the inner end of the eight ribs in the first section of the electrode cylinder, using interval welding, and the welding seam is in the length direction;

Step 2. Insert the second section of the electrode cylinder onto the electrode cylinder welded with round steel in the first step, and weld the shell; after the shell connection is completed, respectively weld the eight round steels welded in the first step on the At the inner end of the eight ribs of the second section of the electrode cylinder, the interval section welding is adopted, and the welding seam is in the length direction;

Step 3. Connect the third electrode tube with the two electrode tubes that have been welded to complete the welding shell;

Step 4. Weld the round steel with U-shaped hooks made at both ends to the inner end of the eight ribs in the third electrode cylinder, and ensure that the U-shaped hooks of the two round steels hook each other to maintain the welding seam requirements. So far Complete a round steel hook chain welding cycle;

Repeat steps 1 to 4 to gradually complete the strengthening of the core of the entire electrode cylinder and the strengthening of the structural tensile strength during the shell connection process.

The round steel has a length of 2m and a diameter of 18mm.

The weld seam length of the spacer welding is more than 150mm.

圆钢，进行电极筒心部的强化，已达到加固其本身结构强度及中心导电能力，以加速电极心部的烧结速度，防止了电极压放时电极糊和电极筒的脱节和抽芯的问题，及电极筒的焊缝开裂漏糊等问题，降低电极焙烧时电极出现软硬断等事故。Through the above-mentioned design scheme, the present invention can bring the following beneficial effects: reduce the accidents of the soft and hard sections of the self-baking electrode of the submerged electric furnace when the electrode is roasted

The round steel is used to strengthen the core of the electrode cylinder, which has reached the purpose of strengthening its own structural strength and central conductivity, so as to accelerate the sintering speed of the electrode core, and prevent the problem of disconnection and core pulling between the electrode paste and the electrode cylinder when the electrode is pressed. , and the weld cracking and leakage of the electrode cylinder, etc., to reduce the occurrence of soft and hard breakage of the electrode during electrode firing.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

Fig. 1 is a schematic diagram of the connection structure of the round steel of the electrode tube and the round steel that reduces the accident of soft and hard sections when the self-baking electrode of the submerged heat electric furnace is roasted according to the present invention.

In the figure, 1-housing, 2-rib plate, 3-round steel, 5-electrode cylinder.

Detailed ways

δ＝3mm现有的电极筒的工况条件为例，制备降低矿热电炉自焙电极焙烧时软硬段事故电极筒，如图1所示，包括以下步骤，This embodiment takes

δ=3mm The existing working conditions of the electrode cylinder are taken as an example, and the electrode cylinder for reducing the soft and hard section accidents during the self-baking electrode of the submerged electric furnace is prepared, as shown in Figure 1, including the following steps,

Step 1. Make round steel 3 with U-shaped hooks at both ends, 2m in length and 18mm in diameter, and weld them to the center of the 8 ribs 2 of the first electrode cylinder 5 respectively. The welds are required to be in the length direction , the length of the weld seam is not less than 150mm when using spacer welding;

Step 2: Insert the second electrode tube 5 onto the first electrode tube 5 welded with 8 round steel bars 3, and then perform the normal shell 1 welding work;

Step 3: After completing the welding work of the first electrode cylinder 5 and the outer cylinder of the second electrode cylinder 5 and the ribs, the 8 round steel bars 3 are correspondingly welded to the inner ends of the 8 ribs 2, and the weld seam It is required that in the length direction, the length of the weld seam should not be less than 150mm by using interval section welding;

Step 4. Connect the third section of the electrode tube with the first and second section of the electrode tube to complete the normal shell connection;

Step 5. Make round steel with U-shaped hooks with a length of 2m and a diameter of 18mm at both ends, and weld them in the third section of the electrode cylinder respectively. One end of the 8 ribs is close to the center, and ensure that the two round steels are U-shaped. The hook heads are hooked to each other to maintain the welding seam requirements. So far, a round steel hook chain welding cycle has been completed.

Claims (4)

1. Reduce the accidents of the soft and hard sections of the self-baking electrode of the submerged heat electric furnace. The electrode cylinder is characterized in that it includes more than one electrode cylinder (5), and each electrode cylinder (5) includes a shell (1) and ribs (2). And the round steel (3), the shell (1) is cylindrical; the ribs (2) are eight, evenly arranged inside the shell (1); the round steel (3) is welded on the ribs (2), the two ends of the round steel (3) are provided with U-shaped hooks, and the U-shaped hooks of the round steel (3) are connected to each other; Connect, the length that two electrode cylinders (5) connect is identical with the length of a round steel (3). 2. The preparation of the soft and hard section accident electrode cylinder when reducing the self-baking electrode of the submerged heat electric furnace is characterized in that it includes the following steps, and the following steps are carried out in sequence, Step 1. Weld the round steel (3) with U-shaped hooks at both ends to the inner end of the eight ribs (2) in the first section of the electrode cylinder, using interval welding, and the weld seam is in the length direction; Step 2. Put the second electrode tube (5) into the electrode tube (5) welded with the round steel (3) in the step 1, and weld the shell; The eight round steel bars (3) are respectively welded to the inner ends of the eight rib plates of the second section of the electrode cylinder (5), and are welded at intervals, and the welds are in the length direction; Step 3. Connect the third electrode tube with the two electrode tubes that have been welded to complete the welding shell; Step 4. Weld the round steel (3) with U-shaped hooks made at both ends to the inner end of the eight ribs (2) in the third electrode cylinder, and ensure that the two round steel U-shaped hooks hook each other. Keep the welding seam requirements, so far complete a round steel (3) hook chain welding cycle; Repeat steps 1 to 4 to gradually complete the strengthening of the core of the entire electrode cylinder and the strengthening of the structural tensile strength during the shell connection process. 3. The preparation of the electrode cylinder for reducing soft and hard section accidents when the self-baking electrode of the submerged heat electric furnace according to claim 2 is characterized in that: the length of the round steel (3) is 2m, and the diameter is 18mm. 4. The preparation of the electrode cylinder for reducing the soft and hard section accidents when the self-baking electrode of the submerged heat electric furnace according to claim 2 is characterized in that: the weld seam length of the interval section welding is more than 150 mm.

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