阅读说明：本技术 一种超低碳钢中间包用干式料及其制备方法、施工方法 (Dry material for ultra-low carbon steel tundish and preparation method and construction method thereof ) 是由 卓胜 毛朋 郭仁孝 于 2020-12-09 设计创作，主要内容包括：本发明属于冶金技术领域,公开了一种超低碳钢中间包用干式料及其制备方法、施工方法,包括含有废镁碳粉的渣线用干式料和不含碳的熔池用干式料,所述渣线用干式料主要由以下重量份数的原料组成：废镁碳粉45-75重量份；镁砂5-30重量份；酚醛树脂3-6重量份；硼酸0.5-1.5重量份。本发明还公开了一种超低碳钢中间包用干式料的制备方法以及一种超低碳钢中间包用干式料的施工方法。本发明的超低碳钢中间包用干式料分为渣线用干式料和熔池干式料,可分别用于中间包工作层的渣线部位和熔池部位,可防止采用含碳耐火材料导致的钢水增碳问题,镁碳砖粉料的加入可代替部分的镁砂,降低使用成本的同时获得较长的渣线使用寿命,同时有效避免中包导致的钢水增碳。(The invention belongs to the technical field of metallurgy, and discloses a dry material for an ultra-low carbon steel tundish, a preparation method and a construction method thereof, wherein the dry material comprises a dry material for a slag line containing waste magnesium and carbon powder and a dry material for a molten pool without carbon, and the dry material for the slag line mainly comprises the following raw materials in parts by weight: 45-75 parts of waste magnesium carbon powder; 5-30 parts of magnesia; 3-6 parts of phenolic resin; 0.5 to 1.5 parts by weight of boric acid. The invention also discloses a preparation method of the dry material for the ultra-low carbon steel tundish and a construction method of the dry material for the ultra-low carbon steel tundish. The dry material for the ultra-low carbon steel tundish is divided into a dry material for a slag line and a dry material for a molten pool, and can be respectively used for the slag line part and the molten pool part of a working layer of the tundish, so that the problem of molten steel recarburization caused by adopting a carbon-containing refractory material can be prevented.)

1. A dry material for an ultra-low carbon steel tundish is characterized in that: comprises a dry material for a slag line containing waste magnesium carbon powder and a dry material for a molten pool without carbon.

2. The dry material for an ultra-low carbon steel tundish according to claim 1, wherein: the dry material for the slag line mainly comprises the following raw materials in parts by weight:

3. the dry material for an ultra-low carbon steel tundish according to claim 2, wherein: the waste magnesia carbon powder comprises 5-15 parts by weight of magnesia carbon brick fine powder and 40-60 parts by weight of magnesia carbon brick particles.

4. The dry material for an ultra-low carbon steel tundish according to claim 3, wherein: the particle size range of the magnesia carbon brick fine powder is 0-0.1mm, and the particle size range of the magnesia carbon brick particles is 0.1-5 mm.

5. The dry material for an ultra-low carbon steel tundish according to claim 2, wherein: the particle size range of the magnesite is 1-5 mm.

6. The dry material for an ultra-low carbon steel tundish according to claim 2, wherein: the magnesia carbon brick fine powder and the magnesia carbon brick particles are processed by recycling waste magnesia carbon bricks, wherein the magnesia carbon brick fine powder has an MgO content of more than 65 percent, and the C content of more than 12 percent.

7. The dry material for an ultra-low carbon steel tundish according to any one of claims 2 to 6, wherein: the dry material for the molten pool mainly comprises the following raw materials in parts by weight:

93-97 parts of magnesia;

3-6 parts of phenolic resin;

0.5 to 1.5 parts by weight of boric acid.

8. The method of manufacturing the dry material for an ultra-low carbon steel tundish according to claim 7, wherein: the preparation method comprises a preparation method of a dry material for a slag line and a preparation method of a dry material for a molten pool;

the preparation method of the dry material for the slag line comprises the following steps: and (2) putting 45-75 parts by weight of waste magnesium carbon powder, 3-6 parts by weight of phenolic resin and 0.5-1.5 parts by weight of borax into a stirrer for stirring, and obtaining the dry material for the slag line after uniform stirring.

9. The method for preparing a dry material for an ultra-low carbon steel tundish according to claim 8, wherein the method comprises the following steps: the preparation method of the dry material for the molten pool comprises the following steps: and (2) putting 93-97 parts by weight of magnesia, 3-6 parts by weight of phenolic resin and 0.5-1.5 parts by weight of boric acid into a stirrer for stirring, and obtaining the dry material for the molten pool after uniform stirring.

10. A method of constructing the dry material for an ultra-low carbon steel tundish according to any one of claims 1 to 7, wherein: the tundish working layer comprises a slag line layer and a molten pool layer, wherein a slag line dry material and a molten pool dry material are respectively added into the slag line layer and the molten pool layer, and then the tundish working layer is integrally knotted by using vibration equipment and then baked.

Technical Field

The invention belongs to the technical field of metallurgy, and particularly relates to a dry material for an ultra-low carbon steel tundish, and a preparation method and a construction method thereof.

Background

The tundish is positioned between the ladle and the crystallizer and is used for receiving molten steel of the ladle and injecting the molten steel into the crystallizer. With the rapid development of the high-efficiency continuous casting steel-making technology and the use of the quick-change nozzle technology, the requirement on the service life of the tundish working lining is higher and higher. The dry material working lining at the slag line part of the tundish is corroded by the tundish covering agent and the steel slag, and the slag corrosion resistance of the dry material working lining becomes a service life limiting link of the tundish.

According to the introduction of Ruan national wisdom article "recarburization of refractory materials to ultra-low carbon steel" (refractory material 2004.06), carbon in the refractory materials can be directly dissolved in molten steel, resulting in recarburization of the molten steel. The Wen Zhengyong of Wuhan science and technology university is introduced in Shuoshi paper "research on preparation of modifier using waste magnesia carbon brick as matrix and dissolution kinetics", wherein the carbon content of the waste magnesia carbon brick particles is more than 5%, and the carbon content of the powder is more than 12%.

The patent of China invention with application number CN202010166784.0 discloses a regenerated magnesia carbon tundish dry material and a preparation method thereof, and introduces the use of a regenerated magnesia carbon brick particle material after processing waste magnesia carbon bricks in the production of the tundish dry material, but does not mention the treatment of the powder part of the processed magnesia carbon bricks.

The patent "a dry material using waste magnesia carbon bricks as main raw material and its preparation method" (application number: 201210470084.6) describes a dry vibration material produced by using magnesia carbon brick processing material as aggregate and matrix, but the dry vibration material produced by said method is difficult to be used for producing ultra-low carbon steel, and its application range is limited.

The dry vibration materials of the conventional tundish working layer are all integrally prepared, and the corresponding dry vibration materials are not respectively prepared according to the slag line part and the molten pool part, so that the service life of the dry vibration materials is short, the overall performance is reduced, the risk of recarburization of molten steel caused by refractory materials exists, and the cost is high.

Disclosure of Invention

The invention aims to solve the problems that the service life of the existing tundish dry vibrating material is short and molten steel is easy to be carburized, and provides a dry material for an ultra-low carbon steel tundish, a preparation method and a construction method thereof.

The technical scheme adopted by the invention is as follows:

in one aspect, the dry material for the ultra-low carbon steel tundish comprises a dry material for a slag line containing waste magnesium carbon powder and a dry material for a molten pool containing no carbon.

In an optional technical scheme, the dry material for the slag line mainly comprises the following raw materials in parts by weight:

in an optional technical scheme, the waste magnesia carbon powder comprises 5-15 parts by weight of magnesia carbon brick fine powder and 40-60 parts by weight of magnesia carbon brick particles.

In an optional technical scheme, the particle size range of the magnesia carbon brick fine powder is 0-0.1mm, and the particle size range of the magnesia carbon brick particles is 1-5 mm.

In an optional technical scheme, the particle size range of the magnesite is 1-5 mm.

In an optional technical scheme, the magnesia carbon brick fine powder and the magnesia carbon brick particles are processed by recycling waste magnesia carbon bricks, wherein the magnesia carbon brick fine powder has an MgO content of more than 65% and a C content of more than 12%.

In an optional technical scheme, the dry material for the molten pool mainly comprises the following raw materials in parts by weight:

93-97 parts of magnesia;

3-6 parts of phenolic resin;

0.5 to 1.5 parts by weight of boric acid.

In another aspect, the invention provides a preparation method of a dry material for an ultra-low carbon steel tundish, which comprises a preparation method of a dry material for a slag line and a preparation method of a dry material for a molten pool;

the preparation method of the dry material for the slag line comprises the following steps: and (2) putting 45-75 parts by weight of waste magnesium carbon powder, 3-6 parts by weight of phenolic resin and 0.5-1.5 parts by weight of borax into a stirrer for stirring, and obtaining the dry material for the slag line after uniform stirring.

In an optional technical scheme, the preparation method of the dry material for the molten pool comprises the following steps: and (2) putting 93-97 parts by weight of magnesia, 3-6 parts by weight of phenolic resin and 0.5-1.5 parts by weight of boric acid into a stirrer for stirring, and obtaining the dry material for the molten pool after uniform stirring.

In other aspects, the construction method of the dry material for the ultra-low carbon steel tundish is also provided, the working layer of the tundish comprises a slag line layer and a molten pool layer, the slag line dry material and the molten pool dry material are respectively added into the slag line layer and the molten pool layer, and then the working layer of the tundish is integrally knotted by using vibration equipment and then baked.

The invention has the beneficial effects that:

the dry material for the ultra-low carbon steel tundish is divided into a dry material for a slag line and a dry material for a molten pool, and can be respectively used for the slag line part and the molten pool part of a tundish working layer; the dry vibration material used for the molten pool part does not contain carbon relative to the existing tundish dry vibration material, thus the problem of recarburization of molten steel caused by adopting a carbon-containing refractory material can be prevented, the dry vibration material at the slag line part is added with magnesia carbon brick powder with higher carbon content, the addition of the magnesia carbon brick powder can replace part of magnesia, the service life of the slag line is prolonged while the use cost is reduced, simultaneously the recarburization of the molten steel caused by a tundish is effectively avoided, the production cost of the dry vibration material is reduced, the influence of carbon in the dry vibration material on the components of the molten steel is avoided, and the dry vibration material can be applied to the production of ultra-low carbon steel.

The dry material for the ultra-low carbon steel tundish takes the waste magnesia carbon bricks as the additive material, so that the waste magnesia carbon bricks can be recycled, the waste of resources is reduced, the manufacturing cost of the product is also reduced, meanwhile, the prepared product has excellent service performance, the influence of a refractory material on the components of molten steel is reduced while the service time of the dry material is prolonged, and the dry material has obvious social and economic benefits.

Meanwhile, the preparation method of the dry material for the ultra-low carbon steel tundish is simple, has no special requirements on preparation equipment and environment, and is simple and convenient in construction method, so that the dry material has good market popularization and application values.

Detailed Description

The dry material for the slag line is used for the slag line part of the tundish working layer, and the dry material for the molten pool is used for the molten pool part of the tundish working layer; compared with the existing tundish dry vibrating material, the dry material for the molten pool does not contain carbon, and can prevent the problem of recarburization of molten steel caused by refractory materials. The carbon-containing refractory material is influenced by the penetration of molten steel into the refractory material, and carbon is dissolved and diffused into the molten steel to cause the recarburization of the molten steel, so that the problem can be effectively avoided by adopting the carbon-free dry vibration material at the molten pool part. The slag line part contains waste magnesia carbon powder relative to the existing tundish dry-type vibrating material, so that partial magnesia can be replaced by adding the waste magnesia carbon powder, the production cost of the dry-type vibrating material is reduced, the influence of carbon in the dry-type vibrating material on the molten steel component is avoided, and the slag line part can be applied to the production of ultra-low carbon steel. After the dry material for the slag line and the dry material for the molten pool are respectively used for the slag line part and the molten pool part, the slag resistance of the dry material for the slag line part is increased, the practical service life is prolonged, the use cost of steel making is stated, and the smelting requirement of ultra-low carbon steel can be met.

The present invention is further illustrated below with reference to specific examples.

Example 1:

this example provides a dry material for an ultra-low carbon steel tundish, which comprises a dry material for a slag line containing waste magnesium-carbon powder and a dry material for a molten pool containing no carbon. The dry material for the slag line mainly comprises the following raw materials in parts by weight: 45 parts of waste magnesium carbon powder; 5 parts of magnesia; 3 parts of phenolic resin; 0.5 part by weight of boric acid; the waste magnesium carbon powder comprises 5 parts by weight of magnesia carbon brick fine powder and 40 parts by weight of magnesia carbon brick particles; the particle size range of the magnesia carbon brick fine powder is 0.025mm, and the particle size range of the magnesia carbon brick is 1.5 mm. The particle size range of the magnesite is 1.5 mm.

The magnesia carbon brick fine powder and the magnesia carbon brick particles are processed by recycling waste magnesia carbon bricks, wherein the magnesia carbon brick fine powder has the MgO content of more than 65 percent, and the C content of more than 12 percent. The processing of the waste magnesia carbon brick fine powder and the waste magnesia carbon brick particles comprises the following steps: selecting the recycled waste magnesia carbon bricks, and crushing the waste magnesia carbon bricks into large particles by using a jaw crusher; then crushing the large particles into small particles with the particle size of 0.1mm by using a roller crusher; the small particles with the particle size of 0.1mm are ground into fine powder with the particle size of 0.045mm by a grinding machine.

The dry material for the molten pool mainly comprises the following raw materials in parts by weight: 93 parts of magnesia; 3 parts of phenolic resin; boric acid 0.5 parts by weight.

Preparing a dry material for a slag line: 45 parts by weight of waste magnesium carbon powder, 5 parts by weight of magnesia and 3 parts by weight of phenolic resin; 0.5 part by weight of boric acid is put into a stirrer to be stirred, and the dry material for the molten pool is obtained after uniform stirring.

Preparation of dry materials for a molten pool: and (3) putting 93 parts by weight of magnesia, 3 parts by weight of phenolic resin and 0.5 part by weight of boric acid into a stirrer for stirring, and uniformly stirring to obtain the dry material for the molten pool.

And adding the slag line dry material and the molten pool dry material into a slag line part and a molten pool part of the tundish working layer respectively, then using a vibration motor to integrally knot the tundish working layer, baking, and finishing the product construction after baking.

Example 2:

this example provides a dry material for an ultra-low carbon steel tundish, which comprises a dry material for a slag line containing waste magnesium-carbon powder and a dry material for a molten pool containing no carbon. The dry material for the slag line mainly comprises the following raw materials in parts by weight: 50 parts by weight of waste magnesium carbon powder; 20 parts of magnesia; 4 parts of phenolic resin; boric acid is 1 part by weight; the waste magnesium carbon powder comprises 10 parts by weight of magnesia carbon brick fine powder and 50 parts by weight of magnesia carbon brick particles; the particle size range of the magnesia carbon brick fine powder is 0.045mm, and the particle size range of the magnesia carbon brick is 0.9 mm. The particle size range of the magnesite is 3 mm.

The magnesia carbon brick fine powder and the magnesia carbon brick particles are processed by recycling waste magnesia carbon bricks, wherein the magnesia carbon brick fine powder has the MgO content of more than 65 percent, and the C content of more than 12 percent. The processing of the waste magnesia carbon brick fine powder and the waste magnesia carbon brick particles comprises the following steps: selecting the recycled waste magnesia carbon bricks, and crushing the waste magnesia carbon bricks into large particles by using a jaw crusher; then crushing the large particles into small particles with the particle size of 0.2mm by using a roller crusher; the small particles with the particle size of 0.2mm are ground into fine powder with the particle size of 0.088mm by a mill.

The dry material for the molten pool mainly comprises the following raw materials in parts by weight: 95 parts of magnesia; 5 parts of phenolic resin; boric acid 1 part by weight.

Preparing a dry material for a slag line: 50 parts by weight of waste magnesium carbon powder, 20 parts by weight of magnesia and 4 parts by weight of phenolic resin; 1 part by weight of boric acid is put into a stirrer to be stirred, and the dry material for the molten pool is obtained after uniform stirring.

Preparation of dry materials for a molten pool: and (3) putting 95 parts by weight of magnesia, 5 parts by weight of phenolic resin and 1 part by weight of boric acid into a stirrer for stirring, and obtaining the dry material for the molten pool after uniform stirring.

And adding the slag line dry material and the molten pool dry material into a slag line part and a molten pool part of the tundish working layer respectively, then using a vibration motor to integrally knot the tundish working layer, baking, and finishing the product construction after baking.

Example 3:

this example provides a dry material for an ultra-low carbon steel tundish, which comprises a dry material for a slag line containing waste magnesium-carbon powder and a dry material for a molten pool containing no carbon. The dry material for the slag line mainly comprises the following raw materials in parts by weight: 75 parts by weight of waste magnesium carbon powder; 30 parts of magnesia; 6 parts of phenolic resin; boric acid 1.45 parts by weight; the waste magnesium carbon powder comprises 15 parts by weight of magnesia carbon brick fine powder and 58 parts by weight of magnesia carbon brick particles; the particle size range of the magnesia carbon brick fine powder is 0.09mm, and the particle size range of the magnesia carbon brick is 1.1 mm. The particle size range of the magnesite is 4 mm.

The magnesia carbon brick fine powder and the magnesia carbon brick particles are processed by recycling waste magnesia carbon bricks, wherein the magnesia carbon brick fine powder has the MgO content of more than 65 percent, and the C content of more than 12 percent. The processing of the waste magnesia carbon brick fine powder and the waste magnesia carbon brick particles comprises the following steps: selecting the recycled waste magnesia carbon bricks, and crushing the waste magnesia carbon bricks into large particles by using a jaw crusher; then crushing the large particles into small particles with the particle size of 0.15mm by using a roller crusher; the small particles with the particle size of 0.15mm are ground into fine powder with the particle size of 0.09mm by a grinding machine.

The dry material for the molten pool mainly comprises the following raw materials in parts by weight: 97 parts by weight of magnesia; 6 parts of phenolic resin; boric acid 1.4 parts by weight.

Preparing a dry material for a slag line: 75 parts by weight of waste magnesium carbon powder, 30 parts by weight of magnesia and 6 parts by weight of phenolic resin; 1.45 parts by weight of boric acid is put into a stirrer to be stirred, and the dry material for the molten pool is obtained after uniform stirring.

Preparation of dry materials for a molten pool: 97 parts by weight of magnesia, 6 parts by weight of phenolic resin and 1.4 parts by weight of boric acid are put into a stirrer to be stirred, and the dry material for the molten pool is obtained after uniform stirring.

And adding the slag line dry material and the molten pool dry material into a slag line part and a molten pool part of the tundish working layer respectively, then using a vibration motor to integrally knot the tundish working layer, baking, and finishing the product construction after baking.

The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.