阅读说明：本技术 一种用于电炉钢包的脱氧工艺 (Deoxidation process for electric furnace ladle ) 是由 王磊 魏庆义 郝同标 于 2020-05-11 设计创作，主要内容包括：本发明公开了一种电炉钢包的脱氧工艺,该工艺包括：石灰石和铝磨粉到粒度为1mm以下,然后磨粉后的石灰石和铝与碳含量为90％的石墨碳混匀,采用干粉压球机压制成直径为20-30mm的碳酸钙碳铝球,其中石灰石的配加比例的质量百分数占碳铝球质量的37-46％,铝的配加比例的质量百分数占碳铝球质量的40-50％,石墨炭的配加比例的质量百分数占碳球质量的4-7％,碳酸钙碳球中间的碳含量质量百分数控制在5-7％；碳酸钙能够迅速的碎裂成为极细颗粒的CaO颗粒,与脱氧产物形成液态或者固态的脱氧产物,具有较快的反应速度,铝粉的加入进一步的氧化了耐火材料及炉渣向钢液中输送氧及氧化物,且残留的三氧化二铝产物也不影响钢的使用性,进而进一步的提高了钢液的脱氧效率及其质量。(The invention discloses a deoxidation process for an electric furnace ladle, which comprises the following steps: grinding limestone and aluminum to the particle size of below 1mm, then uniformly mixing the ground limestone and aluminum with graphite carbon with the carbon content of 90%, and pressing into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by using a dry powder ball press, wherein the mass percentage of the limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%; the calcium carbonate can be rapidly crushed into the CaO particles with extremely fine particles to form a liquid or solid deoxidation product with the deoxidation product, the reaction speed is high, the addition of the aluminum powder further oxidizes the refractory materials and the slag to convey oxygen and oxides into the molten steel, and the residual aluminum oxide product does not influence the usability of the steel, so that the deoxidation efficiency and the quality of the molten steel are further improved.)

1. A deoxidation process for an electric furnace ladle is characterized by comprising the following steps:

s1: preparing a deoxidizing material, grinding limestone and aluminum to the particle size of below 1mm, then uniformly mixing the ground limestone and aluminum with graphite carbon with the carbon content of 90%, and pressing the mixture into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by using a dry powder ball press, wherein the mass percentage of the limestone in the addition proportion accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the aluminum in the addition proportion accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the graphite carbon in the addition proportion accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%;

s2: storing and containing the proportioned materials, and carrying out vacuum packaging on the proportioned calcium carbonate carbon aluminum balls by a vacuum packaging machine according to 2-2.2kg per bag;

s3: and (3) performing intensified refining deoxidation, namely feeding calcium carbonate carbon aluminum balls in vacuum in an intensified refining period, adding the calcium carbonate carbon aluminum balls into an electric furnace or a converter according to 2-2.2kg of steel per ton, and blowing fluorine for 7-10 minutes.

2. The deoxidation process for electric furnace ladles as claimed in claim 1 wherein: the preparation and mixing of the aluminum powder are carried out in an oxygen-free environment.

3. The deoxidation process for electric furnace ladles as claimed in claim 1 wherein: pressing into calcium carbonate carbon aluminum balls with the diameter of 24mm by a dry powder ball press, wherein the mass percentage of the addition proportion of limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

4. The deoxidation process for electric furnace ladles as claimed in claim 1 wherein: pressing into calcium carbonate carbon aluminum balls with the diameter of 26mm by a dry powder ball press, wherein the mass percentage of the addition proportion of limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

5. A deoxidation process for an electric furnace ladle as claimed in claim 3 wherein: pressing into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by a dry powder ball press, wherein the mass percentage of the addition proportion of limestone accounts for 44% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 6% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

6. The deoxidation process for electric furnace ladles as claimed in claim 5 wherein: pressing into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by a dry powder ball press, wherein the mass percentage of the addition proportion of limestone accounts for 45% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 48% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

Technical Field

The invention relates to a deoxidation process, in particular to a deoxidation process for an electric furnace ladle, and belongs to the technical field of deoxidation processes of ladles.

Background

In the process of electric furnace or converter steelmaking, harmful elements in the middle of scrap steel or molten iron are oxidized from the middle of molten steel in an oxidation mode, then the steel is converted into steel slag and enters the slag to achieve the purpose of removing, the steel-making process causes the molten steel in the converter or the electric furnace to contain a certain amount of dissolved oxygen, because dissolved oxygen exists in the middle of molten steel or steel billets, the quality of steel is damaged, the performance of the steel is affected, therefore, a deoxidizer or a deoxidized alloy is required to deoxidize molten steel in the tapping process, and after the deoxidizer or the deoxidized alloy is deoxidized, some of the oxygen reacts with the dissolved oxygen in the molten steel to generate oxides which exist in the molten steel and have adverse effects on the castability of the molten steel and the performance of steel, therefore, in the steel making process, it is necessary to remove these oxides from the molten steel as much as possible by means of argon blowing or the like.

However, the high-intensity argon blowing is adopted, so that only bubbles can be coarsened and the purpose of effectively removing inclusions cannot be achieved, and when calcium carbonate carbon balls are used for carrying out deoxidation reaction on molten steel, although the deoxidation amount is increased, the high-intensity argon blowing is not suitable for steel with high deoxidation.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a deoxidation process for an electric furnace ladle.

In order to solve the technical problems, the deoxidation process for the electric furnace ladle provided by the invention comprises the following steps:

s1: preparing a deoxidizing material, grinding limestone and aluminum to the particle size of below 1mm, then uniformly mixing the ground limestone and aluminum with graphite carbon with the carbon content of 90%, and pressing the mixture into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by using a dry powder ball press, wherein the mass percentage of the limestone in the addition proportion accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the aluminum in the addition proportion accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the graphite carbon in the addition proportion accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%;

s2: storing and containing the proportioned materials, and carrying out vacuum packaging on the proportioned calcium carbonate carbon aluminum balls by a vacuum packaging machine according to 2-2.2kg per bag;

s3: and (3) performing intensified refining deoxidation, namely feeding calcium carbonate carbon aluminum balls in vacuum in an intensified refining period, adding the calcium carbonate carbon aluminum balls into an electric furnace or a converter according to 2-2.2kg of steel per ton, and blowing fluorine for 7-10 minutes.

Specifically, the aluminum powder preparation and mixing processes are carried out in an oxygen-free environment.

Specifically, a dry powder ball press is adopted to press the calcium carbonate carbon aluminum balls with the diameter of 24mm, wherein the mass percentage of the addition proportion of limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

Specifically, a dry powder ball press is adopted to press calcium carbonate carbon aluminum balls with the diameter of 26mm, wherein the mass percentage of the addition proportion of limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

Specifically, a dry powder ball press is adopted to press the calcium carbonate carbon aluminum balls with the diameter of 20-30mm, wherein the mass percentage of the addition proportion of limestone accounts for 44% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 6% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

Specifically, a dry powder ball press is adopted to press the calcium carbonate carbon aluminum balls with the diameter of 20-30mm, wherein the mass percentage of the addition proportion of limestone accounts for 45% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 48% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

The invention has the beneficial effects that: grinding limestone and aluminum to the particle size of below 1mm, then uniformly mixing the ground limestone and aluminum with graphite carbon with the carbon content of 90%, and pressing into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by using a dry powder ball press, wherein the mass percentage of the limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%; calcium carbonate carbon aluminum balls are fed in vacuum in the reinforced refining period, in the initial deoxidation period, the concentration difference of oxygen is large, the number of cores of deoxidation products is large, the number of cores of the deoxidation products in unit volume is large, and the oxygen content is reduced more quickly; the calcium carbonate can be rapidly disintegrated into superfine CaO particles, and the CaO particles and the deoxidation products form liquid or solid deoxidation products, so that the reaction speed is high, and the graphite carbon is uniformly distributed in the addition area to participate in the deoxidation reaction. Therefore, the deoxidation speed of the calcium carbonate carbon spheres is superior to that of the traditional calcium carbide deoxidation and premelting slag deoxidation, and the small bubbles floating upwards and adhering to the inclusion are increased. The calcium carbonate in the middle of the calcium carbonate carbon spheres is heated in the middle of the molten steel, can rapidly generate decomposition reaction and is broken into small particles, a plurality of CO/CO2 small bubbles are decomposed to participate in the reaction of removing the adhered inclusions, the CO2/CO bubbles generated by the decomposition of the calcium carbonate in the middle of the calcium carbonate carbon spheres promote the diffusion speed of the middle graphite carbon, the coupling reaction with the free oxygen in the middle of the molten steel is facilitated, the purpose of rapid deoxidation is achieved, the addition of the aluminum powder further oxidizes the refractory materials and the slag to convey oxygen and oxides into the molten steel, and the usability of the steel is not affected by the residual aluminum oxide product, so that the deoxidation efficiency and the quality of the molten steel are further improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a flow chart of a preferred embodiment of the deoxidation process for an electric furnace ladle provided by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

First embodiment

As shown in fig. 1, the deoxidation process for the electric furnace ladle provided by the invention comprises the following steps:

s1: preparing a deoxidizing material, grinding limestone and aluminum to the particle size of below 1mm, then uniformly mixing the ground limestone and aluminum with graphite carbon with the carbon content of 90%, and pressing the mixture into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by using a dry powder ball press, wherein the mass percentage of the limestone in the addition proportion accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the aluminum in the addition proportion accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the graphite carbon in the addition proportion accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%;

s2: storing and containing the proportioned materials, and carrying out vacuum packaging on the proportioned calcium carbonate carbon aluminum balls by a vacuum packaging machine according to 2-2.2kg per bag;

s3: and (3) performing intensified refining deoxidation, namely feeding calcium carbonate carbon aluminum balls in vacuum in an intensified refining period, adding the calcium carbonate carbon aluminum balls into an electric furnace or a converter according to 2-2.2kg of steel per ton, and blowing fluorine for 7-10 minutes.

Specifically, the aluminum powder preparation and mixing processes are carried out in an oxygen-free environment.

Specifically, a dry powder ball press is adopted to press the calcium carbonate carbon aluminum balls with the diameter of 24mm, wherein the mass percentage of the addition proportion of limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

Second embodiment

Based on the deoxidation process for the electric furnace steel ladle provided by the first embodiment of the invention, the deoxidation process for the electric furnace steel ladle provided by the second embodiment of the invention is different in that a dry powder ball press is adopted to press calcium carbonate carbon aluminum balls with the diameter of 26mm, wherein the mass percentage of the addition proportion of limestone accounts for 37-46% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 40-50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 4-7% of the mass of the carbon balls, and the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

Third embodiment

Based on the deoxidation process for the electric furnace steel ladle provided by the second embodiment of the invention, the deoxidation process for the electric furnace steel ladle provided by the first embodiment of the invention is different in that a dry powder ball press is adopted to press calcium carbonate carbon aluminum balls with the diameter of 20-30mm, wherein the mass percentage of the addition proportion of limestone accounts for 44% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 50% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 6% of the mass of the carbon balls, and the mass percentage of carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

Fourth embodiment

Based on the deoxidation process for the electric furnace steel ladle provided by the first embodiment of the invention, the deoxidation process for the electric furnace steel ladle provided by the fourth embodiment of the invention is different in that a dry powder ball press machine is adopted to press calcium carbonate carbon aluminum balls with the diameter of 20-30mm, wherein the mass percentage of the addition proportion of limestone accounts for 45% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of aluminum accounts for 48% of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of graphite carbon accounts for 7% of the mass of the carbon balls, and the mass percentage of carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7%.

When the invention is used, limestone and aluminum are ground to the granularity of less than 1mm, then the ground limestone and aluminum are mixed with graphite carbon with the carbon content of 90 percent, and the mixture is pressed into calcium carbonate carbon aluminum balls with the diameter of 20-30mm by a dry powder ball press, wherein the mass percentage of the addition proportion of the limestone accounts for 37-46 percent of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of the aluminum accounts for 40-50 percent of the mass of the carbon aluminum balls, the mass percentage of the addition proportion of the graphite carbon accounts for 4-7 percent of the mass of the carbon balls, the mass percentage of the carbon content in the middle of the calcium carbonate carbon balls is controlled to be 5-7 percent, the materials with the completed proportion are stored and stored, the calcium carbonate carbon aluminum balls with the completed proportion are vacuum-packaged by a vacuum packaging machine according to 2-2.2kg per bag, the calcium carbonate carbon aluminum balls are vacuum-fed in an enhanced refining period, and the calcium carbonate carbon aluminum balls are added in an electric furnace or, blowing fluorine for 7-10 minutes; calcium carbonate carbon aluminum balls are fed in vacuum in the reinforced refining period, in the initial deoxidation period, the concentration difference of oxygen is large, the number of cores of deoxidation products is large, the number of cores of the deoxidation products in unit volume is large, and the oxygen content is reduced more quickly; the calcium carbonate can be rapidly disintegrated into superfine CaO particles, and the CaO particles and the deoxidation products form liquid or solid deoxidation products, so that the reaction speed is high, and the graphite carbon is uniformly distributed in the addition area to participate in the deoxidation reaction. Therefore, the deoxidation speed of the calcium carbonate carbon spheres is superior to that of the traditional calcium carbide deoxidation and premelting slag deoxidation, and the small bubbles floating upwards and adhering to the inclusion are increased. The calcium carbonate in the middle of the calcium carbonate carbon spheres is heated in the middle of the molten steel, can rapidly generate decomposition reaction and is broken into small particles, a plurality of CO/CO2 small bubbles are decomposed to participate in the reaction of removing the adhered inclusions, the CO2/CO bubbles generated by the decomposition of the calcium carbonate in the middle of the calcium carbonate carbon spheres promote the diffusion speed of the middle graphite carbon, the coupling reaction with the free oxygen in the middle of the molten steel is facilitated, the purpose of rapid deoxidation is achieved, the addition of the aluminum powder further oxidizes the refractory materials and the slag to convey oxygen and oxides into the molten steel, and the usability of the steel is not affected by the residual aluminum oxide product, so that the deoxidation efficiency and the quality of the molten steel are further improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.