A method of filling a converter joint material

Abstract

The application provides a filling method for converter joint material, and relates to the technical field of converter smelting.The filling method for converter joint material comprises the following operation steps: step one: laying magnesium-carbon bricks on a new movable hearth steel shell, and installing a conical protective cover above the magnesium-carbon bricks to form a new movable hearth; step two: installing the new movable hearth to a converter body; step three: pouring joint material for joints into the converter from a converter port; step four: rocking the converter three times; step five: rocking the converter to the right, and pouring joint material for joints into the converter from the converter port; step six: keeping the converter still for 3 min; step seven: pouring joint material for joints into the converter from the converter port; and step eight: keeping the converter still, baking the converter, and starting the converter. The filling method for converter joint material can ensure that the joint material is efficiently, accurately and densely filled to the joint, and the service life of the furnace lining is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of converter smelting, in particular to a filling method of converter joint material. BACKGROUND

[0002] The domestic converter generally adopts the method of bottom blowing inert gas to improve the mixing effect of the converter, so as to improve the quality of the converter molten steel. Numerous studies have shown that the greater the bottom blowing stirring intensity, the better the quality of the converter end molten steel, but at the same time, the faster the erosion speed of the furnace lining, and the shorter the service life of the converter. In order to realize the long service life of the furnace lining under the condition of large bottom blowing stirring intensity, metallurgical workers have carried out a series of technical development, including the development of quick-changing furnace bottom process, quick-changing bottom blowing tuyere technology, etc., but there are some problems, after the quick-changing bottom blowing tuyere, its service life is short, and it is very limited to improve the overall service life of the converter; by using the quick-changing furnace bottom process, there is a large joint between the new movable furnace bottom and the furnace body, since the joint needs to use a refractory material with good fluidity, the filling requirement is relatively strict, such as CN201811305635.7, CN201810802718.0, CN201810801684.3, CN201810461428.4, CN201810462707.2, etc., all of which are to improve the pumping performance of the refractory material to ensure the safety and reliability of the joint position. However, the above experimental methods all establish the way of pumping the refractory material in the furnace bottom, and the problem of this method is that once the pumping process is blocked, it cannot continue pumping efficiently and in time, and the refractory material has the possibility of solidification in the converter, and eventually leads to pumping failure and quick-changing furnace bottom failure. SUMMARY

[0003] The purpose of the present application is to provide a filling method of converter joint material, which can ensure that the joint material is filled into the joint with high efficiency, precision and compactness, and ensure the service life of the furnace lining, so as to solve the problems raised in the background art.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A filling method of converter joint material, comprising a furnace bottom steel shell and a furnace body steel shell, the furnace bottom steel shell and the furnace body steel shell are connected in a detachable manner, the furnace bottom steel shell is provided with magnesia carbon bricks, the furnace body steel shell is also provided with magnesia carbon bricks, and an annular joint is formed between the magnesia carbon bricks on the furnace bottom steel shell and the magnesia carbon bricks on the furnace body steel shell, the annular joint needs to be filled with joint material, and the joint material comprises first refractory material, second refractory material and third refractory material; during the joint material filling process of the converter furnace bottom quick-changing, the filling method of the joint material comprises the following operation steps:

[0006] Step one: laying magnesia carbon bricks on the new movable furnace bottom steel shell, and installing a conical protective cover above the magnesia carbon bricks to form a new movable furnace bottom;

[0007] Step two: install the new movable furnace bottom to the converter body, tightly connect with the steel shell of the furnace body, and control the width of the annular joint between the magnesia carbon bricks on the new movable furnace bottom and the magnesia carbon bricks on the steel shell of the furnace body to be 80-200mm;

[0008] Step three: pour the joint filler into the converter from the converter port, and control the filling amount of the joint filler to be 60%-80% of the total joint filler filling amount;

[0009] Step four: shake the furnace three times, and control that the refractory material does not flow out from the furnace bottom joint at the maximum shaking angle;

[0010] Step five: shake the converter to the right, pour the joint filler into the converter from the converter port, and control the filling amount of the joint filler to be 15%-25% of the total joint filler filling amount;

[0011] Step six: let the converter stand for 3 minutes;

[0012] Step seven: pour the joint filler into the converter from the converter port, and control the filling amount of the joint filler to be 5%-15% of the total joint filler filling amount;

[0013] Step eight: heat preservation, oven heating, and start-up.

[0014] As a further scheme of the present application: the bottom diameter of the conical protective cover in step one is the diameter of the new movable furnace bottom minus (50-100) mm, the height of the conical protective cover is 0.8-1.2 times the diameter of the new movable furnace bottom, and the material of the conical protective cover is steel, which is fixed on the new movable furnace bottom.

[0015] As a further scheme of the present application: the particle size of the first refractory material in steps three, five and seven is between 0.1-1mm, the particle size of the second refractory material is between 1-5mm, and the particle size of the third refractory material is between 5-20mm.

[0016] As a further scheme of the present application: the total joint filler filling amount is 1.3-1.6 times the theoretical joint filler filling amount in the joint.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The application provides a filling method of converter joint material, comprising the following steps: step one: laying magnesium-carbon bricks on a new movable hearth steel shell, and installing a conical protective cover above the magnesium-carbon bricks to form a new movable hearth; step two: installing the new movable hearth to the converter body, tightly connecting with the converter body steel shell, and controlling the width of the annular joint between the magnesium-carbon bricks on the new movable hearth and the magnesium-carbon bricks on the converter body steel shell to be 80-200 mm; step three: pouring the joint joint material into the converter from the converter port, and controlling the loading amount of the joint joint material to be 60%-80% of the total joint material loading amount; step four: rocking the converter for three times, and controlling the refractory material not to flow out from the bottom joint when the rocking maximum angle is reached; step five: rocking the converter to the right, pouring the joint joint material into the converter from the converter port, and controlling the loading amount of the joint joint material to be 15%-25% of the total joint material loading amount; step six: keeping the converter still for 3 min; step seven: pouring the joint joint material into the converter from the converter port, and controlling the loading amount of the joint joint material to be 5%-15% of the total joint material loading amount; and step eight: keeping the converter still, baking the converter, and starting the converter. The filling method of the converter joint material can ensure that the joint material is efficiently, accurately and densely filled into the joint, and the service life of the converter lining is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0020] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings. In the following description, the same reference numerals represent the same parts.

[0021] Fig. 1 The structure schematic diagram of the converter of the filling method of the converter joint material provided by the embodiments of the present application.

[0022] Fig. 2 The flowchart of the filling method of the converter joint material provided by the embodiments of the present application.

[0023] Identified in the figure:

[0024] 1, hearth steel shell; 2, shaft steel shell; 3, hearth magnesium-carbon brick; 4, shaft magnesium-carbon brick; 5, annular joint; 6, bottom blowing port. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0026] Embodiment 1

[0027] Please refer to the drawings Figs. 1-2 The embodiment of the present application provides a filling method of converter joint material, which comprises a furnace bottom steel shell 1 and a furnace body steel shell 2. The furnace bottom steel shell 1 and the furnace body steel shell 2 are connected in a detachable manner. The furnace bottom steel shell 1 is provided with magnesia carbon bricks, and the furnace body steel shell 2 is also provided with magnesia carbon bricks. An annular joint is formed between the magnesia carbon bricks on the furnace bottom steel shell 1 and the magnesia carbon bricks on the furnace body steel shell 2. The annular joint needs to be filled with joint material. The joint material comprises a first refractory material, a second refractory material and a third refractory material. In the process of filling the joint material of the converter furnace bottom quick change, the filling method of the joint material comprises the following operation steps:

[0028] Step 1: laying magnesia carbon bricks on the new movable furnace bottom steel shell 1, and installing a conical protective cover above the magnesia carbon bricks to form a new movable furnace bottom;

[0029] Step 2: installing the new movable furnace bottom to the converter body, tightly connecting with the furnace body steel shell 2, and controlling the width of the annular joint between the magnesia carbon bricks on the new movable furnace bottom and the magnesia carbon bricks on the furnace body steel shell 2 to be 80mm;

[0030] Step 3: pouring the joint joint material into the converter from the converter port, and controlling the filling amount of the joint joint material to be 70% of the total joint material filling amount;

[0031] Step 4: rocking the furnace for three times, and controlling that the refractory material does not flow out from the furnace bottom joint when the rocking angle is the maximum;

[0032] Step 5: rocking the converter to the right position, pouring the joint joint material into the converter from the converter port, and controlling the filling amount of the joint joint material to be 15% of the total joint material filling amount;

[0033] Step 6: keeping the converter still for 3 minutes;

[0034] Step 7: pouring the joint joint material into the converter from the converter port, and controlling the filling amount of the joint joint material to be 15% of the total joint material filling amount;

[0035] Step 8: keeping the converter still for 3 minutes;

[0036] The present application provides a filling method of converter joint material. Through the above steps, the joint material can be efficiently, accurately and densely filled into the joint, and the service life of the furnace lining is guaranteed.

[0037] In a preferred embodiment of the present application, the diameter of the bottom of the conical protective cover in step one is 50mm less than the diameter of the new movable hearth, the height of the conical protective cover is 0.8 times the diameter of the new movable hearth, and the material of the conical protective cover is steel.

[0038] In a preferred embodiment of the present application, the particle size of the joint material in step three is between 0.1mm and 1mm, the particle size of the joint material in step five is between 1mm and 5mm, and the particle size of the joint material in step seven is between 5mm and 20mm.

[0039] In a preferred embodiment of the present application, the total amount of joint material is 1.3 times the theoretical amount of joint material that can be filled in the joint.

[0040] Example 2:

[0041] The embodiment of the present application provides a filling method for converter joint material, which comprises a hearth steel shell 1 and a shaft steel shell 2, the hearth steel shell 1 and the shaft steel shell 2 are connected in a detachable manner, the hearth steel shell 1 is provided with magnesite carbon bricks, the shaft steel shell 2 is also provided with magnesite carbon bricks, and an annular joint is formed between the magnesite carbon bricks on the hearth steel shell 1 and the magnesite carbon bricks on the shaft steel shell 2, the annular joint needs to be filled with joint material, and the joint material comprises a first refractory material, a second refractory material and a third refractory material; in the joint material filling process of the converter hearth quick change, the filling method of the joint material comprises the following operation steps:

[0042] Step one: laying magnesite carbon bricks on the new movable hearth steel shell 1, and installing a conical protective cover above the magnesite carbon bricks to form a new movable hearth;

[0043] Step two: installing the new movable hearth to the converter body, tightly connecting with the shaft steel shell 2, and controlling the width of the annular joint between the magnesite carbon bricks on the new movable hearth and the magnesite carbon bricks on the shaft steel shell 2 to be 200mm;

[0044] Step three: pouring the joint joint material into the converter from the converter port, and controlling the filling amount of the joint joint material to be 75% of the total joint material filling amount;

[0045] Step four: rocking the converter for three times, and controlling that the refractory material does not flow out of the hearth joint when the rocking angle is the maximum;

[0046] Step five: rocking the converter to be vertical, pouring the joint joint material into the converter from the converter port, and controlling the filling amount of the joint joint material to be 20% of the total joint material filling amount;

[0047] Step six: placing the converter for 3 minutes;

[0048] Step seven: pour the joint filler from the converter mouth into the converter, and control the loading amount of the joint filler to be 5% of the total joint filler loading amount;

[0049] Step eight: conditioning, oven, start-up.

[0050] The present application provides a kind of filling method of converter joint filler, by above-mentioned steps can guarantee that joint filler is efficiently, accurate, dense and filled to joint, guarantee the service life of furnace lining.

[0051] In a preferred embodiment of the application, the bottom diameter of the conical protective cover in step one is the diameter of the new movable furnace bottom minus 100 mm, the height of the conical protective cover is 1.2 times the diameter of the new movable furnace bottom, and the material of the conical protective cover is steel, which is fixed on the new movable furnace bottom.

[0052] In a preferred embodiment of the application, the particle size of the joint filler in step three is between 0.1 and 1 mm, the particle size of the joint filler in step five is between 1 and 5 mm, and the particle size of the joint filler in step seven is between 5 and 20 mm.

[0053] In a preferred embodiment of the application, the total joint filler loading amount is 1.6 times the theoretical joint filler loading amount.

[0054] The present application provides a kind of filling method of converter joint filler, including the following steps: step one: lay magnesium-carbon bricks on the new movable furnace bottom steel shell 1, install a conical protective cover above the magnesium-carbon bricks to form a new movable furnace bottom; step two: install the new movable furnace bottom to the converter body, tightly connect with the furnace shell steel shell 2, and control the width of the annular joint between the magnesium-carbon bricks on the new movable furnace bottom and the magnesium-carbon bricks on the furnace shell steel shell 2 to be between 80 and 200 mm; step three: pour the first refractory material for joint from the converter mouth into the converter, and control the loading amount of the first refractory material for joint to be 60% to 80% of the total joint filler loading amount; step four: shake the furnace three times, and control the refractory material not to flow out from the furnace bottom joint when the maximum angle of shaking is reached; step five: shake the converter to the right position, pour the second refractory material for joint from the converter mouth into the converter, and control the loading amount of the second refractory material for joint to be 15% to 25% of the total joint filler loading amount; step six: let the converter stand for 3 minutes; step seven: pour the third refractory material for joint from the converter mouth into the converter, and control the loading amount of the third refractory material for joint to be 5% to 15% of the total joint filler loading amount; step eight: conditioning, oven, start-up. The present application provides a kind of filling method of converter joint filler, by above-mentioned steps can guarantee that joint filler is efficiently, accurate, dense and filled to joint, guarantee the service life of furnace lining.

[0055] In the above embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0056] In the description of the present application, the terms "first", "second" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0057] The principles and implementation modes of the present application are described herein by applying specific examples, and the above example descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will have changes, and in summary, the content of the specification should not be understood as a limitation on the present application.

Claims

1. A method for filling seam material in a converter, characterized in that, The furnace includes a bottom steel shell and a body steel shell, which are detachably connected. Magnesia-carbon bricks are installed on both the bottom and body steel shells. An annular joint is formed between the magnesia-carbon bricks on the bottom and body steel shells. This annular joint needs to be filled with a jointing material, which includes a first refractory material, a second refractory material, and a third refractory material. During the quick-change jointing process at the converter bottom, the jointing method includes the following steps: Step 1: Lay magnesia-carbon bricks on the new movable furnace bottom steel shell, and install a conical protective cover on top of the magnesia-carbon bricks to form a new movable furnace bottom. The bottom diameter of the conical protective cover is the diameter of the new movable furnace bottom minus (50~100) mm, and the height of the conical protective cover is 0.8~1.2 times the diameter of the new movable furnace bottom. Step 2: Install the new movable furnace bottom to the converter body, ensuring a tight connection with the furnace body steel shell, and control the width of the annular joint between the magnesia-carbon bricks on the new movable furnace bottom and the magnesia-carbon bricks on the furnace body steel shell to be between 80 and 200 mm. Step 3: Pour the first refractory material into the converter from the converter opening, and control the total amount of the first refractory material to be 60% to 80% of the total joint material loading. The particle size of the first refractory material is between 0.1 and 1 mm. Step 4: Shake the furnace three times, controlling the maximum shaking angle so that the first refractory material does not flow out from the bottom joint of the furnace; Step 5: Right the converter and pour the second refractory material into the converter from the furnace mouth. Control the total amount of the second refractory material to be 15% to 25% of the total joint material loading. The particle size of the second refractory material is between 1 and 5 mm. Step 6: Let the converter stand for 3 minutes; Step 7: Pour the third refractory material into the converter from the converter opening, and control the total amount of the third refractory material to be 5% to 15% of the total joint material loading amount, wherein the particle size of the third refractory material is between 5 and 20 mm; Step 8: Nourishing the oven, baking the oven, and starting the oven; The total amount of joint material to be filled is 1.3 to 1.6 times the theoretical amount of joint material that can be filled into the joint.

2. The method for filling converter joint material according to claim 1, characterized in that, The conical protective cover in step one is made of steel and is fixed to the new movable furnace bottom.

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