CN114317882A

CN114317882A - Alloy baking method for duplex smelting

Info

Publication number: CN114317882A
Application number: CN202111568271.3A
Authority: CN
Inventors: 韩鹏; 郭平; 何氢玲; 解澄剑; 江涛; 熊火顺; 董中友
Original assignee: CRRC Yangtze Tongling Co Ltd
Current assignee: CRRC Yangtze Tongling Co Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-04-12

Abstract

The invention discloses an alloy baking method for duplex smelting, which relates to the technical field of metallurgical smelting, and is used for alloy addition in the duplex smelting alloying process of an EAF electric arc furnace and an LF refining furnace by a method of baking an alloy in a ladle baking device along with a ladle. The invention also provides an alloy baking lifting appliance and a steel ladle for duplex smelting. The alloy is roasted in the ladle by the ladle roaster, so that free water and crystal water in the alloy can be effectively removed, and the alloy has no obvious temperature drop due to roasting along with the ladle, so that the problem of adverse influence of alloy cooling on refining effect and molten steel quality is solved, the heat preservation effect is good, the duplex smelting refining effect is promoted, and the quality of produced products is improved. Meanwhile, because the alloy is baked without other devices, the operation procedures are reduced, the procedure time is saved, and the enterprise benefit is increased.

Description

Alloy baking method for duplex smelting

Technical Field

The invention belongs to the technical field of metallurgical smelting, and particularly relates to an alloy baking method for duplex smelting.

Background

The alloy is an important raw material required in a steel-making process, such as ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrovanadium and the like, and the moisture content in the alloy directly influences the quality of molten steel and the tapping temperature, so that the alloy material is baked and then used. On one hand, the alloy baking is used for removing water to reduce hydrogen in molten steel, and on the other hand, the alloy baking can reduce the temperature drop of the molten steel in the alloy adding process and avoid increasing energy consumption.

In actual production, the alloy added in the tapping stage of the EAF electric arc furnace is cooled due to long standing time after tapping, and the temperature of molten steel in the initial refining stage can be reduced by adding the cooled alloy into a ladle, so that the refining effect and the molten steel quality are influenced.

Disclosure of Invention

The invention aims to provide an alloy baking method for duplex smelting, which aims at the problems that in the prior art, an alloy added in the tapping stage of an EAF electric arc furnace is cooled due to long standing time after tapping, and the temperature of molten steel in the initial refining stage can be reduced by adding the cooled alloy into a ladle, so that the refining effect and the quality of the molten steel are influenced. By the method that the alloy is baked along with the ladle in the ladle baking device, free water and crystal water in the alloy can be effectively removed, and due to the baking along with the ladle, the alloy has no obvious temperature drop, so that the duplex smelting refining effect is promoted, and the quality of a produced product is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

an alloy baking method for duplex smelting is designed, and the alloy is baked in a ladle baking device along with a ladle, is used for alloy addition in the duplex smelting alloying process of an EAF electric arc furnace and an LF refining furnace, and is suitable for alloys such as silicon, manganese, chromium and the like.

The alloy baking method for duplex smelting comprises the following specific steps:

1) and placing the alloy into a ladle, placing the alloy at a ladle baking device through a lifting appliance, baking for about 70min, heating at a temperature of more than 800 ℃, wherein the temperature of more than 800 ℃ is favorable for fully removing free water and crystal water in the alloy, and the adding temperature of the alloy is met.

2) And after the baking is stopped, the alloy is hoisted to the EAF electric arc furnace and the LF refining furnace along with the steel ladle to carry out steel tapping, and the steel tapping process is controlled to be about 3 minutes. At the moment, the heat storage capacity of the steel ladle is large, the heat dissipation of the ladle bottom is poor, and the alloy has no obvious temperature drop.

Compared with the prior art, the alloy baking method for duplex smelting provided by the invention has the beneficial effects that:

(1) the alloy baking method for duplex smelting changes the traditional baking mode of the alloy by adopting a heating furnace, provides a method for baking the alloy at a ladle baking device along with a ladle, can effectively remove free water and crystal water in the alloy, and has no obvious temperature drop due to baking along with the ladle.

(1) According to the alloy baking method for duplex smelting, disclosed by the invention, the alloy is baked along with a steel ladle without independently baking in other modes, and is discharged from a furnace to wait for feeding, so that the temperature drop is reduced, and the moisture condensation on the surface of the alloy is prevented.

(3) According to the alloy baking method for duplex smelting, due to the fact that other devices are not needed for alloy baking, operation procedures are reduced, procedure time is saved, and enterprise benefits are increased.

In order to quickly complete the control of the tapping process, the alloy baking hanger for duplex smelting is also provided, and is suitable for the alloy baking method for duplex smelting.

Furthermore, one end of the double-fork arm base, which is positioned on the upright post, is provided with a traction connecting part for hanging the locomotive.

Furthermore, the both sides of lift cylinder are equipped with the lifing arm that is used for strengthening, the both ends of lifing arm are connected respectively on double fork arm base and brace table.

Furthermore, a limiting pin for locking the fixing pin is arranged on the pin seat.

Furthermore, the base of the side pulling cylinder is rotatably connected to the stand column, and the output end of the side pulling cylinder is connected with a lifting hook through a chain.

The utility model provides a ladle is used for alloy baking hoist that pair was smelted, this ladle includes the inclusion, the both sides of inclusion are equipped with the pinhole that is used for the fixed pin to peg graft, bottom one side of inclusion is equipped with the lug that is used for the lifting hook to hang.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of an alloy baking hanger for duplex smelting according to the present invention;

FIG. 2 is a schematic view of the assembly structure of the alloy baking sling and a ladle for duplex smelting according to the present invention;

FIG. 3 is a schematic view of the present invention in relation to a ladle tapping process;

labeled as: 1. a dual-yoke base; 11. a traction connection; 12. a roller; 13. a lifting cylinder; 14. a support table; 141. a pin boss; 142. a spacing pin; 15. a fixing pin; 16. a lifting arm; 17. a column; 18. a side pull cylinder; 19. a hook; 2. a bag body; 21. a pin hole; 22. and (7) lifting lugs.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The structural features of the present invention will now be described in detail with reference to the accompanying drawings.

An alloy baking method for duplex smelting is used for adding alloy in the duplex smelting alloying process of an EAF electric arc furnace and an LF refining furnace by baking the alloy in a ladle baking device along with a ladle. The method comprises the following specific steps: placing the alloy into a ladle, placing the ladle into a ladle baking device through a lifting appliance for baking, controlling the baking time to be about 70min, heating the ladle to a temperature higher than 800 ℃, stopping baking, hoisting the alloy to an EAF electric arc furnace and an LF refining furnace along with the ladle for tapping, and controlling the tapping process to be about 3 min.

In order to ensure that the heat loss in the hoisting process of the steel ladle is reduced and the steel tapping process is controlled within about 3 minutes, the invention also provides a duplex smelting alloy baking hanger which is suitable for the duplex smelting alloy baking method and comprises a duplex arm base 1, wherein a plurality of rollers 12 are arranged on an arm seat of the duplex arm base 1, the rollers 12 are arranged along the direction of the duplex arm and are used for improving the supporting strength and the stability of the duplex arm base 1, two sides of the duplex arm base 1 are provided with synchronous lifting cylinders 13, in order to improve the side stress of the lifting cylinders 13, two sides of the lifting cylinders 13 are provided with lifting arms 16 for strengthening, two ends of the lifting arms 16 are respectively connected to the duplex arm base 1 and supporting tables 14, when the lifting cylinders 13 lift, the lifting arms 16 lift together, the supporting tables 14 are fixedly arranged on the output ends of the lifting cylinders 13, the supporting tables 14 on the two sides are symmetrically provided with fixing pins 15 for fixing the steel ladle, the support table 14 is provided with a pin boss 141 for inserting the fixing pin 15, and the pin boss 141 is provided with a stopper pin 142 for locking the fixing pin 15. The end part of the double-wishbone base 1 is provided with an upright post 17, the upright post 17 is provided with a side pulling cylinder 18 for tapping, the base of the side pulling cylinder 18 is rotatably connected to the upright post 17, and the output end of the side pulling cylinder 18 is connected with a lifting hook 19 through a chain. The end of the double-fork arm base 1, which is located on the upright column 17, is provided with a traction connecting part 11 for hanging the locomotive, and the locomotive can be connected with the traction connecting part 11 to drive the lifting appliance to move in the carrying process.

In order to adapt to the alloy baking lifting appliance for duplex smelting, the invention also provides a steel ladle, which comprises a ladle body 2, wherein pin holes 21 for inserting the fixing pins 15 are formed in two sides of the ladle body 2, and a lifting lug 22 for hanging the lifting hook 19 is arranged on one side of the bottom of the ladle body 2.

Specifically, when the device is used, the duplex smelting alloy baking hanger is pushed to a ladle position through a locomotive, the double-fork arm base 1 is inserted into two sides of the ladle, pin holes 21 on two sides of the ladle body 2 are plugged through fixing pins 15, a lifting hook 19 is hung on a lifting lug 22, after the assembly of the ladle is completed, alloy materials are added into the ladle, the ladle is lifted by a certain height through a lifting cylinder 13 and moved to the ladle baking device position to bake the ladle, after the baking is completed, the duplex smelting alloy baking hanger is pushed to an EAF electric arc furnace and an LF refining furnace position through the locomotive, the ladle is continuously lifted to a furnace mouth through the lifting cylinder 13, and finally, the baked alloy in the ladle is fed into the furnace through a side pulling cylinder 18.

For a further understanding of the contents of the present invention, reference will now be made in detail to the following examples.

Example 1

According to the alloy baking method for duplex smelting, the calculated mass of each elementary substance is 15.2kg of C elementary substance, 140.4kg of Mn elementary substance, 45kg of Si elementary substance, 44kg of Cr elementary substance and 75.4kg of Fe elementary substance, the temperature of molten steel required to be reached is 1600 ℃, the weight of the molten steel is 18t, the alloy is baked in a ladle for about 70 minutes by a ladle baking device, the color of the ladle and the alloy are red and white, the temperature is higher than 800 ℃, and free water and crystal water in the alloy can be effectively removed. Because the process from stopping baking and hanging ladle to tapping is only about 3 minutes, and the heat storage capacity of the ladle is large, the heat dissipation of the ladle bottom is poor, the alloy is not obviously cooled, and the high temperature is still kept.

Example 2

As another embodiment of the present invention, the difference from embodiment 1 is that: after the alloy is baked in a special heating furnace at 450 ℃ and is kept warm for 2 hours, free water and crystal water in the alloy are basically removed, but the temperature of the alloy drops quickly during the placement of a tapping platform and even drops to room temperature in winter, and meanwhile, the surface of the alloy has vapor condensation in the process of temperature drop, and the quality of molten steel is seriously influenced after the alloy is put into the furnace.

Based on the alloy calculation table, the comparative calculation of the alloys in example 1 and example 2 in the baking kiln was calculated.

The influence difference delta T of the two alloy baking modes on the molten steel temperature is approximately equal to 19 ℃, namely the temperature reduction amplitude of the smelting furnace arc furnace for baking the alloy in the steel ladle at the tapping stage can be reduced by 19 ℃ under the condition of no influence of other factors, and the temperature uniformity of the molten steel in the steel ladle is obviously improved.

The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will, however, be understood that various modifications and changes may be made without departing from the scope of the invention as defined in the appended claims. The detailed description and drawings are to be regarded as illustrative rather than restrictive, and any such modifications and variations are intended to be included within the scope of the present invention as described herein. Furthermore, the background is intended to be illustrative of the state of the art as developed and the meaning of the present technology and is not intended to limit the scope of the invention or the application and field of application of the invention.

More specifically, although exemplary embodiments of the invention have been described herein, the invention is not limited to these embodiments, but includes any and all embodiments modified, omitted, combined, e.g., between various embodiments, adapted and/or substituted, as would be recognized by those skilled in the art from the foregoing detailed description. The limitations in the claims are to be interpreted broadly based the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.

Claims

1. The alloy baking method for duplex smelting is characterized in that the alloy is baked in a ladle baking device along with a ladle and is used for adding the alloy in the duplex smelting alloying process of an EAF electric arc furnace and an LF refining furnace;

1) placing the alloy into a ladle, placing the alloy at a ladle baking device through a lifting appliance for baking, wherein the baking time is controlled to be about 70min, and the temperature is heated to be more than 800 ℃;

2) and after the step 1) is finished, stopping baking, and carrying out steel tapping on the alloy at the EAF electric arc furnace and the LF refining furnace along with ladle hoisting, wherein the steel tapping process is controlled to be about 3 minutes.

2. A duplex smelting alloy baking hanger is suitable for the duplex smelting alloy baking method according to claim 1, and comprises a double-fork arm base (1), wherein the arm seat of the double-fork arm base (1) is provided with a roller (12), and the duplex smelting alloy baking hanger is characterized in that two sides of the double-fork arm base (1) are provided with synchronous lifting cylinders (13), the output end of each lifting cylinder (13) is fixedly provided with a supporting table (14), the supporting tables (14) at two sides are symmetrically provided with fixing pins (15) for fixing a steel ladle, and the supporting tables (14) are provided with pin seats (141) for inserting the fixing pins (15);

the end part of the double-fork arm base (1) is provided with an upright post (17), and the upright post (17) is provided with a side pulling cylinder (18) for tapping.

3. The duplex metallurgical alloy baking hanger according to claim 2, wherein the end of the double yoke base (1) on the upright (17) is provided with a traction connection part (11) for hanging a locomotive.

4. The alloy baking hanger for duplex smelting according to claim 2, wherein lifting arms (16) for reinforcement are arranged on two sides of the lifting cylinder (13), and two ends of each lifting arm (16) are respectively connected to the double-fork arm base (1) and the supporting platform (14).

5. The duplex metallurgical alloy baking hanger according to claim 2, wherein the pin base (141) is provided with a limit pin (142) for locking the fixing pin (15).

6. The alloy baking hanger for duplex smelting according to claim 2, wherein the base of the side pulling cylinder (18) is rotatably connected to the upright post (17), and the output end of the side pulling cylinder (18) is connected with a lifting hook (19) through a chain.

7. The ladle is characterized by comprising a ladle body (2), pin holes (21) for inserting fixing pins (15) are formed in two sides of the ladle body (2), and lifting lugs (22) for hanging lifting hooks (19) are arranged on one side of the bottom of the ladle body (2).