阅读说明：本技术 炼钢转炉补炉方法 (Steel-smelting converter repairing method ) 是由 黄正华 姚玉磊 王发宪 于 2020-07-23 设计创作，主要内容包括：本发明涉及转炉炼钢领域,尤其是一种便捷且高效率的实现补炉的炼钢转炉补炉方法,包括如下步骤：a、首先在炼钢结束后出尽钢水,并将钢渣留在待修复的已蚀损的转炉内；b、在转炉内加入铁粒,摇摆转炉并混和均匀形成铁粒与钢渣的混和物,随后通过调整转炉将铁粒与钢渣混合物放置在转炉的蚀损部位；c、停留一段时间后,将所述混和物与耐火砖粘结在一起,形成补炉层从而完成补炉。本发明充分利用炼钢转炉的钢渣,并结合转炉的结构特点,成功的实现了转炉高效的补炉作业。同时,本发明的操作过程中污染小、补炉效果佳,技术优势十分明显。本发明尤其适用于炼钢转炉补炉之中。(The invention relates to the field of converter steelmaking, in particular to a converter fettling method for steelmaking converter, which is convenient and efficient to implement fettling and comprises the following steps: a. firstly, completely discharging molten steel after steelmaking is finished, and reserving steel slag in a converter to be repaired, wherein the converter is corroded and damaged; b. adding iron particles into the converter, swinging the converter and uniformly mixing to form a mixture of the iron particles and the steel slag, and then placing the mixture of the iron particles and the steel slag at the corrosion damage part of the converter by adjusting the converter; c. after a certain time, the mixture is bonded with the refractory bricks to form a fettling layer, thereby completing fettling. The invention makes full use of the steel slag of the steel converter and combines the structural characteristics of the converter to successfully realize the high-efficiency fettling operation of the converter. Meanwhile, the method has the advantages of small pollution, good furnace repairing effect and obvious technical advantages in the operation process. The invention is especially suitable for the fettling of the steel converter.)

1. The steel-making converter fettling method is characterized by comprising the following steps:

a. firstly, completely discharging molten steel after steelmaking is finished, and reserving steel slag in a converter to be repaired, wherein the converter is corroded and damaged;

b. adding iron particles into the converter, swinging the converter and uniformly mixing to form a mixture of the iron particles and the steel slag, and then placing the mixture of the iron particles and the steel slag at the corrosion damage part of the converter by adjusting the converter;

c. after a certain time, the mixture is bonded with the refractory bricks to form a fettling layer, thereby completing fettling.

2. The steelmaking converter fettling method of claim 1, wherein: in the step a, the end temperature range is 1640-1700 ℃ when the steel making is finished.

3. The steelmaking converter fettling method of claim 1, wherein: in the step b, the length range of the iron particles is 5 mm-50 mm, and the thickness range is 5 mm-20 mm.

4. The steelmaking converter fettling method of claim 1, wherein: in the step b, the mass fraction of the iron element in the iron particles is more than or equal to 90%, and the mass fraction of the carbon element is 2.5-4.5%.

5. The steelmaking converter fettling method of claim 1, wherein: in the step b, the weight ratio of the iron particles to the steel slag is 0.5-1.2: 1.

6. the steelmaking converter fettling method of claim 1, wherein: in the step b, the swing angle range of the converter is as follows: -130 to + 130.

7. The steelmaking converter fettling method of claim 1, wherein: in step c, the residence time is 15 minutes to 25 minutes.

8. The steelmaking converter fettling method of claim 1, wherein: the corrosion depth of the converter is more than 100 mm.

Technical Field

The invention relates to the field of converter steelmaking, in particular to a converter repairing method for a steelmaking converter.

Background

The existing method for repairing the steel converter mainly adopts refractory material repairing. The refractory material contains powdery refractory material and a binder, the refractory material has certain fluidity at high temperature, and the binder is melted at high temperature in the converter after steel making, so that the refractory material and the refractory brick of the converter lining are bonded together to form a fettling layer, and the method has the following defects: firstly, the smoke dust is large in the fettling process, and certain pollution is caused to the environment; secondly, the furnace repairing time is long, about 50 to 70 minutes; thirdly, repairing materials need to be purchased, and the cost of the repairing materials is needed. In addition, the steel-making converter repairing method also comprises refractory brick patching. The furnace repairing method is characterized in that refractory bricks are repaired at the corroded part of the converter by refractory mortar, and the method needs mechanical hands for operation. The furnace repairing method has the following defects: the furnace repairing operation is difficult, and the furnace repairing is inconvenient.

In addition, there is also a pig iron nugget fettling method in which a pig iron nugget is mixed with slag and the mixture is fettled at the site of erosion of the converter. The disadvantages of this method: the pig iron blocks have large mass, poor melting effect and infirm patching, thus affecting the furnace patching effect.

Disclosure of Invention

The invention aims to solve the technical problem of providing a converter repairing method for a steel converter, which can realize furnace repairing conveniently and efficiently.

The technical scheme adopted by the invention for solving the technical problems is as follows: the steel converter repairing method comprises the following steps: a. firstly, completely discharging molten steel after steelmaking is finished, and reserving steel slag in a converter to be repaired, wherein the converter is corroded and damaged; b. adding iron particles into the converter, swinging the converter and uniformly mixing to form a mixture of the iron particles and the steel slag, and then placing the mixture of the iron particles and the steel slag at the corrosion damage part of the converter by adjusting the converter; c. after a certain time, the mixture is bonded with the refractory bricks to form a fettling layer, thereby completing fettling.

Further, in the step a, the end point temperature range of the steel-making is 1640-1700 ℃.

Furthermore, in the step b, the length range of the iron particles is 5 mm-50 mm, and the thickness range is 5 mm-20 mm.

Further, in the step b, the mass fraction of the iron element in the iron particles is more than or equal to 90%, and the mass fraction of the carbon element is 2.5-4.5%.

Further, in the step b, the weight ratio of the iron particles to the steel slag is 0.5-1.2: 1.

further, in the step b, the swing angle range of the converter is as follows: -130 to + 130.

Further, in step c, the residence time is 15 to 25 minutes.

Further, the corrosion depth of the converter is more than 100 mm.

The invention has the beneficial effects that: the invention makes full use of the steel slag of the steel converter and combines the structural characteristics of the converter to successfully realize the high-efficiency fettling operation of the converter. Meanwhile, the method has the advantages of small pollution, good furnace repairing effect and obvious technical advantages in the operation process. The invention is especially suitable for the fettling of the steel converter.

Detailed Description

The steel converter repairing method comprises the following steps: a. firstly, completely discharging molten steel after steelmaking is finished, and reserving steel slag in a converter to be repaired, wherein the converter is corroded and damaged; b. adding iron particles into the converter, swinging the converter and uniformly mixing to form a mixture of the iron particles and the steel slag, and then placing the mixture of the iron particles and the steel slag at the corrosion damage part of the converter by adjusting the converter; c. after a certain time, the mixture is bonded with the refractory bricks to form a fettling layer, thereby completing fettling.

In practice, the steel making in step a is converter steel making, i.e. adding molten iron into a converter, blowing oxygen above the molten iron by using an oxygen lance, adding active lime and a slag former, and tapping at the final temperature of a molten pool, preferably controlled at 1640-1700 ℃, to leave a furnace of steel slag.

In order to realize more accurate fettling operation, the following scheme is preferred: in the step a, the end temperature range is 1640-1700 ℃ when the steel making is finished. The quality of the fettling furnace is ensured by controlling the end temperature when the steel making is finished. In order to ensure the quality of the mixture, it is preferable that the iron particles in step b have a length ranging from 5mm to 50mm and a thickness ranging from 5mm to 20 mm. In the preferable step b, the mass fraction of the iron element in the iron particles is more than or equal to 90%, and the mass fraction of the carbon element in the iron particles is 2.5-4.5%. In the preferable step b, the weight ratio of the iron particles to the steel slag is 0.5-1.2: 1. in the step b, the preferable swing angle range of the converter is as follows: 130 to +130 degrees, thereby ensuring the mixing effect of the mixture and the safety of the operation.

In step c, the residence time is preferably 15 to 25 minutes in order to ensure the final effect of fettling. The invention is especially suitable for repairing the converter with the corrosion depth of the converter more than 100 mm.