TWI678418B - Slag regulating agent in steel making process and manufacturing method thereof - Google Patents

Abstract

A slag conditioner for a steel making process, based on a total weight of 100 wt%, containing 50 to 70 wt% of magnesium-containing waste, 10 to 30 wt% of magnesia, and 20 wt% of anthracite. The invention also provides a method for manufacturing a slagging agent in a steelmaking process, which includes a preparation step, a pulverization step, and a granulation step. The preparation step is to prepare 50 to 70 wt% of magnesium-containing waste, 10 to 30 wt% of magnesia, and 20 wt% of anthracite. In the pulverizing step, the magnesium-containing waste material, the magnesia, and the anthracite are pulverized into a plurality of particles with a particle diameter of 0.5 to 5.0 mm. The granulation step is to granulate the powder into a slag conditioner with a particle size of 30 to 70 mm. The slag adjusting agent used in the steelmaking process of the present invention can replace the original light-burned dolomite slag adjusting agent to form a protective layer and protect the furnace lining, thereby achieving the effect of extending the service life of the steelmaking furnace.

Description

Slag regulating agent in steel making process and manufacturing method thereof

The invention relates to a slag adjusting substance and a manufacturing method thereof, in particular to a slag adjusting agent in a steel making process and a manufacturing method thereof.

In the steelmaking process, magnesium-containing wastes are generated at the stage of the distributor. Although the wastes are refractory materials, they are infiltrated by steel slag during the steelmaking process, which causes the refractory to be reduced and cannot be recycled and used as refractory materials. . Moreover, the magnesium contained in the waste material is in the form of magnesium oxide (MgO). Since the volume of the magnesium oxide expands greatly after reacting with moisture, it cannot be used as concrete or directly buried.

As mentioned above, there is currently no way to properly utilize the waste generated during the distributor stage, and it is usually directly stored. However, in the case of limited space in the factory building or storage yard, it is not a long-term plan to increase the stockpile day by day and cannot reduce it. Those who want to break through the R & D focus.

Therefore, an object of the present invention is to provide a slag adjusting agent capable of reusing a steelmaking magnesium-containing waste material in a steelmaking process and a manufacturing method thereof.

Therefore, based on the total weight of 100 wt%, the slag adjusting agent of the steelmaking process of the present invention contains 50 to 70 wt% of magnesium-containing waste, 10 to 30 wt% of magnesia, and 20 wt% Anthracite.

In addition, the method for manufacturing a slagging agent in the steelmaking process of the present invention includes a preparation step, a pulverization step, and a granulation step.

The preparation step is based on a total weight of 100 wt%, preparing 50 to 70 wt% magnesium-containing waste, 10 to 30 wt% magnesia, and 20 wt% anthracite.

In the pulverizing step, the magnesium-containing waste material, the magnesia, and the anthracite are pulverized into a plurality of particles with a particle diameter of 0.5 to 5.0 mm.

The granulation step is to granulate the powder into a slag conditioning agent having a particle size of 30 to 70 mm.

The effect of the present invention lies in that the slag conditioner of the steelmaking process of the present invention, which is prepared by the method for manufacturing the slag conditioner of the steelmaking process of the present invention, can be used to convert the slag of the steelmaking process to increase the melting temperature of the converter slag and splash The slag can be evenly coated on the inner furnace wall to form a protective layer, which can extend the service life of the converter lining.

Refer to FIG. 1, which is a method embodiment of a method for manufacturing a slagging agent in a steelmaking process of the present invention, and an embodiment of an article that can be made into a slagging agent in a steelmaking process of the present invention. The method embodiment includes a preparation step 11, a pulverization step 12, and a granulation step 13.

The preparation step 11 is based on a total weight of 100 wt%, preparing 50 to 70 wt% of magnesium-containing waste, 10 to 30 wt% of magnesia, and 20 wt% of anthracite. Wherein, the anthracite is a coal material used in a blast furnace of a steelmaking plant, and the use of anthracite has the effect of reducing the content of iron oxide in converter slag. Since the melting temperature of iron oxide is lower than that of magnesium oxide, when the iron oxide content in the converter slag is lower than the magnesium oxide content that is increased by the magnesium-containing component, the temperature at which the slag melts at high temperatures can be effectively increased.

The pulverizing step 12 is pulverizing the magnesium-containing waste material, the magnesia, and the anthracite into a plurality of particles with a particle diameter of 0.5 to 5.0 mm, and particularly preferably 0.5 to 1.0 mm.

The granulation step 13 is to granulate the powder into a slag conditioning agent having a particle size of 30 to 70 mm. In addition to making the granulated slag-forming agent easy to feed, an appropriate particle size can also ensure that it melts quickly after being put into molten steel, so as to quickly release the beneficial ingredients which help adjust the properties of the slag.

Therefore, the article embodiment of the slag adjusting agent in the steelmaking process of the present invention includes, based on the total weight of 100% by weight, 50% to 70% by weight of magnesium-containing waste, 10% to 30% by weight of magnesia, and weight The percentage is 20wt% anthracite. The particle size of the article example made by the method embodiment is based on the principle of easy feeding and sufficient melting in molten steel, and the preferred particle size distribution is 30-70 mm.

Table I:
Magnesium waste Magnesia anthracite Softening Point Melting point Flow point Primitive group - 1284 ℃ 1291 ℃ 1316 ℃ Experiment 1 70wt% 10wt% 20wt% 1351 ℃ 1360 ℃ 1376 ℃ Experiment 2 60wt% 20wt% 20wt% 1370 ℃ 1378 ℃ 1420 ℃ Experiment 3 50wt% 30wt% 20wt% 1370 ℃ 1385 ℃ 1420 ℃ Control group Light burned dolomite 1310 ℃ 1321 ℃ 1338 ℃

Referring to Table 1 above, the article example made by the method embodiment is put into a converter to perform the steelmaking process, and the original group without adding any slag conditioning agent and the same amount of light-burned dolomite as the slag conditioning agent In the control group, the temperature values of the softening point, the melting point, and the pour point are measured, and the substantial effect of the slag-adjusting agent in the steelmaking process of the present invention is actually evaluated. From the data presented in Table 1, it can be seen that the use of light-burned dolomite as a slagging agent can indeed increase the temperature of the softening point, melting point, and flow point compared to the original group without adding any slagging agent. From the data of Experiment 1, Experiment 2, and Experiment 3, it can be known that in the performance of the softening point, melting point, and flow point of the temperature increase, the case of the article embodiment of the slag adjusting agent of the steelmaking process of the present invention, even It can reach a higher temperature than the lightly burned dolomite.

After the embodiment of the article is put into the steelmaking furnace body, the melting temperature of the slag is significantly increased, so the slag generated by the molten steel can adhere to the inner furnace wall of the steelmaking furnace body after splashing and form a protection on the surface Layer, to achieve the effect of protecting the lining of the steelmaking furnace body, so it can form insulation, effectively extend the service life of the lining without affecting the quality of steelmaking.

In summary, the slagging agent and manufacturing method of the steelmaking process of the present invention can indeed be made into a slagging agent that is beneficial to increasing the temperature of the slag. A protective layer is formed on the inner surface of the steel-making furnace body, which effectively prolongs the service life of the furnace lining, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited in this way, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

11‧‧‧ deployment steps

12‧‧‧ crushing step

13‧‧‧ Granulation steps

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which:
FIG. 1 is a block diagram illustrating a method embodiment of a method for manufacturing a slag regulating agent in a steelmaking process according to the present invention.

Claims (7)

A slag regulating agent in a steel making process, based on a total weight of 100% by weight, comprising:
Magnesium-containing waste, 50 ~ 70wt% by weight;
Magnesia, weight percentage is 10 ~ 30wt%; and anthracite, weight percentage is 20wt%. The slag regulating agent in the steel-making process according to claim 1, wherein the magnesium-containing waste material, the magnesia, and the anthracite are powder particles having a particle diameter of 0.5 to 5.0 mm. The slag regulating agent of the steel-making process according to claim 2, wherein the magnesium-containing waste, the magnesia, and the anthracite are powder particles having a particle diameter of 0.5 to 1.0 mm. The slag regulating agent in the steel-making process according to claim 1, wherein the anthracite is a coal material used in a blast furnace of a steel-making plant. A method for manufacturing a slag regulating agent in a steelmaking process includes the following steps:
A preparation step, based on a total weight of 100% by weight, preparing 50 to 70% by weight of magnesium-containing waste, 10-30% by weight magnesite, and 20% by weight of anthracite;
A pulverizing step, pulverizing the magnesium-containing waste material, the magnesia, and the anthracite into a plurality of particles having a particle diameter of 0.5 to 5.0 mm;
In a granulation step, the powders are granulated into a slag conditioning agent having a particle size of 30 to 70 mm. The method for manufacturing a slagging agent in a steelmaking process according to claim 5, wherein in the pulverizing step, the particle diameter of the powder particles is 0.5 to 1.0 mm. The method for manufacturing a slagging agent in a steelmaking process according to claim 5, wherein the anthracite is a coal material used in a blast furnace of a steelmaking plant.