阅读说明：本技术 一种用于铁水罐或钢包精炼的底吹或侧吹多用途透气装置 (Bottom blowing or side blowing multipurpose ventilating device for refining molten iron tank or steel ladle ) 是由 吴开明 周峰 黄成红 于 2021-09-18 设计创作，主要内容包括：本发明提供一种用于铁水罐或钢包精炼的底吹或侧吹多用途透气装置,包括铁水罐或钢包,还包括设置在铁水罐或钢包的底部或侧面填充有耐火浇注料,并且所述的耐火浇注料中还砌筑有1块底吹或侧吹透气砖。每块所述的透气砖上设置独立通道的透气狭缝。本发明透气砖砌筑方式简单,具有底吹/侧吹效果好、减少耐材用量,降低耐材成本优点；透气砖采用透气狭缝,在吹氩时能产生直径为5mm或者更小的微细氩气泡,起到“小真空室”的作用,铁液中的溶解气体(H、N、O)将不断传入微细氩气泡内,随之上浮排出,从而降低铁液中的气体含量,提高了钢材质量。能够用更小的透气砖得到同样的底吹效果,从而减少耐材用量,降低耐材成本。(The invention provides a bottom-blowing or side-blowing multipurpose ventilating device for refining a hot metal ladle or a steel ladle, which comprises the hot metal ladle or the steel ladle, and also comprises a refractory castable filled at the bottom or the side surface of the hot metal ladle or the steel ladle, wherein 1 bottom-blowing or side-blowing ventilating brick is also built in the refractory castable. Each air brick is provided with an air slit of an independent channel. The air brick has simple building mode, good bottom blowing/side blowing effect, reduced refractory material consumption and reduced refractory material cost; the air brick adopts the air slit, can produce the diameter and be 5mm or littleer minute argon bubble when blowing argon, plays the effect of "little vacuum chamber", and dissolved gas (H, N, O) in the molten iron will constantly spread into in the minute argon bubble, and the come-up is discharged thereupon to reduce the gas content in the molten iron, improved steel quality. The same bottom blowing effect can be obtained by using smaller air bricks, thereby reducing the consumption of refractory materials and reducing the cost of the refractory materials.)

1. A bottom-blowing or side-blowing multipurpose ventilating device for refining a hot metal ladle or a steel ladle comprises a hot metal ladle (1) or a steel ladle, and is characterized in that the bottom or the side surface of the hot metal ladle (1) or the steel ladle is filled with a refractory castable (2), and 1 bottom-blowing or side-blowing ventilating brick (3) is also built in the refractory castable (2);

each air brick (3) is provided with an air slit (4) of an independent channel;

the width of the air permeable slit (4) is 0.10-0.20 mm, the length of the air permeable slit is 2-40 times of the width of the air permeable slit, and the center distance of the air permeable slit is 25-50 mm.

2. The bottom-blowing or side-blowing multipurpose airing device for molten iron tank or ladle refining according to claim 1, wherein: the area ratio of the ventilation slit (4) to the upper surface of the air brick (3) is 1: 125-200.

Technical Field

The invention relates to the technical field of ventilating devices, in particular to a bottom blowing or side blowing multipurpose ventilating device for refining a molten iron tank or a steel ladle.

Background

In order to reduce the cost of steel, steel works always try to use scrap steel to replace molten iron in China steel enterprises. Therefore, increasing the scrap ratio is an important issue for steel mills. Newly building a scrap heating wire, adding the scrap heated to the temperature of more than 700 ℃ into a mixer from an iron receiving port of the mixer for mixing; or directly adding the scrap steel heated to the temperature of over 700 ℃ into a hot metal ladle, uniformly blowing argon through an LF furnace, and then adding the molten steel into a converter to become the first choice of a steel mill.

By adopting the molten iron pretreatment technology, the steel-making burden of a steel-making furnace can be reduced, the steel-making process can be optimized, and the quality of steel products is improved. The technology of improving molten iron quality and improving desulfurization efficiency by supplying gas into a molten iron tank through the gas permeable bricks is widely adopted by many steel mills during molten iron pretreatment, and becomes a basic technology during molten iron pretreatment. During molten iron pretreatment, molten iron contained in the molten iron tank is inclined towards the slag removing machine (namely inclined towards the opposite side of the ladle-turning pile) so as to facilitate slag removal, and the air brick of the molten iron tank is arranged on the side of the ladle-turning pile, so that the molten iron slag rushes towards the side of the slag removing machine by blowing in gas, and the effect of rapidly removing the slag is achieved.

The invention discloses an iron leakage prevention structure of an air brick of a hot metal ladle and a replacement method of the air brick of the iron leakage prevention in a patent with the application number of CN 201710004588.1. The invention only provides an iron leakage prevention structure of the air brick of the hot-metal ladle and a replacement method of the air brick of the iron leakage prevention, and does not relate to the design of the air brick, in particular to the effect of bottom blowing uniform molten iron of the air brick.

The invention discloses a steel ladle air brick, which comprises an outer steel sheet, an air brick plate, an air brick core, an occlusion connecting rod, a main gas injection pipe, a flow-dividing branch gas pipe, a gas pressure port and a brick plate protecting ring, belongs to the technical field of refractory materials for steel ladles, and particularly relates to a steel ladle air brick which effectively overcomes the defect that the steel ladle brick core is lost due to overlarge gas pressure when the steel ladle brick is used in the current market, and enhances the occlusion force between the air brick and the core. The air brick overcomes the defect of loss caused by the ladle brick core, but does not have the discussion evaluation of bottom blowing effect.

Patent CN202010748837.X discloses an air brick for ladle refining's fine argon bubble of bottom blowing, including air brick body, brick cover, bottom apron and intake pipe, has reduced molten steel alloying mixing time, has improved the life of air brick, has reduced the maintenance number of times of ladle. The invention is only used for ladle refining, and is different from the invention which can be simultaneously used for a molten iron tank and a ladle.

Research shows that argon is blown into molten steel to play a role in refining the molten steel: can effectively remove non-metallic inclusions, remove dissolved gas and strengthen decarburization. The above effects can be obtained by blowing argon gas into molten iron by using the air brick of the molten iron tank.

Patent CN201310580577.X discloses a preparation method of a slit-type air brick, which relates to a preparation method of an air brick for ladle refining, and comprises the steps of pouring and forming air brick pouring materials in a pouring mold, preparing air brick green bodies, curing and demolding the air brick green bodies, drying and firing the demolded air brick green bodies at high temperature, and finally preparing finished products, wherein the slit-type air brick is only used for the air brick for ladle refining. It is not the same as the present invention that can be used for both the hot metal ladle and the ladle.

Patent CN201010209254.6 discloses a slag removing method for molten steel, which controls the clearance of the upper part of a molten steel tank to be more than 300mm when a converter taps steel. When the molten steel tank is tilted to a slag removing angle, firstly removing the solidified slag shell; adding lime particles into the molten steel tank according to the ratio of lime to slag of 1: 3-6, and uniformly spreading; after the lime and the steel slag fully react, the residual steel slag in the molten steel tank is taken out. The method needs to add lime particles into the ladle and spread the lime particles evenly, and the process is complex. According to the invention, the air brick is arranged on the side wall of the steel ladle for argon blowing, so that the steel ladle slag moves towards the slag removing machine, thereby improving the slag removing efficiency and reducing the inclusion in the molten steel.

The above patent is no matter to blowing argon and stirring the molten iron evenly to adding into hot metal bottle scrap steel, and the side-blown argon plays the quick slag-off effect when the molten iron is preliminary treatment, and no matter is ladle bottom blowing argon refining molten steel or ladle side blowing argon improves the slag-off efficiency, and an air brick that has above-mentioned function simultaneously just in time has come into play.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the bottom-blowing or side-blowing multipurpose ventilating device for refining the hot metal ladle or the steel ladle, which has the advantages of good bottom-blowing effect, reduction of the consumption of refractory materials and reduction of the cost of the refractory materials.

The technical scheme of the invention is as follows: a bottom-blowing or side-blowing multipurpose ventilating device for refining a hot metal ladle or a steel ladle comprises the hot metal ladle or the steel ladle, and also comprises a refractory castable filled at the bottom or the side surface of the hot metal ladle or the steel ladle, and 1 bottom-blowing or side-blowing ventilating brick is also built in the refractory castable.

Preferably, each air brick is provided with an air slit of an independent channel.

Preferably, the width of the ventilation slit is 0.10-0.20 mm, the length of the ventilation slit is 2-40 times of the width, and the center distance is 25-50 mm.

Preferably, the area ratio of the ventilation slits to the upper surface of the air brick is 1: 125-200.

The invention has the beneficial effects that:

1. the air brick has the advantages of simple building mode and strong practicability, and the air brick has the advantages of good bottom blowing/side blowing effect, reduction of the consumption of refractory materials and reduction of the cost of the refractory materials;

2. the air brick of the invention adopts the air slit, can produce the fine argon bubble with the diameter of 5mm or less when blowing argon, play the role of a 'small vacuum chamber', the dissolved gas (H, N, O) in the molten iron will be continuously transmitted into the fine argon bubble, and then float upwards and discharge, thus reducing the gas content in the molten iron and improving the quality of steel. The same bottom blowing effect can be obtained by using smaller air bricks, so that the using amount of refractory materials is reduced, and the cost of the refractory materials is reduced;

3. the invention can be used for hot metal ladles and steel ladles, has wide application, and the air brick can be simultaneously used for bottom blowing and side blowing, thereby improving the quality of molten iron and molten steel, having good bottom blowing and side blowing effects and being beneficial to shortening the iron preparation time; the steel yield is improved, the scrap steel ratio is improved, the steel making cost is reduced, and the steel making management cost is reduced.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural view of the air brick of the present invention;

FIG. 3 is a schematic structural diagram according to embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram according to embodiment 4 of the present invention;

in the figure, 1-a hot metal ladle, 2-refractory castable, 3-air bricks and 4-air slits.

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings:

example 1

As shown in fig. 1, the present embodiment provides a bottom-blowing or side-blowing multipurpose ventilating device for a hot-metal ladle, which comprises a hot-metal ladle 1, and further comprises a refractory castable 2 filled at the bottom or at the side of the hot-metal ladle 1, and 1 bottom-blowing or side-blowing ventilating brick 3 is further built in the refractory castable 2.

Preferably, as shown in fig. 2, each of the air bricks 3 is provided with an air slit 4 for independent passage. Wherein, the width of the ventilating slit 4 is 0.10-0.20 mm, the length is 2-40 times of the width, and the center distance is 25-50 mm. The area ratio of the air permeable slits to the upper surface of the air permeable brick is 1: 125-200.

Example 2

The embodiment provides a bottom-blowing or side-blowing multipurpose ventilating device for ladle refining, which comprises a ladle, and also comprises 1 bottom-blowing or side-blowing ventilating brick 3 which is arranged at the bottom or the side surface of the ladle and filled with refractory castable 2, and the refractory castable 2 is also internally provided with bricks.

Preferably, each air brick 3 is provided with an air slit 4 of an independent channel. Wherein, the width of the ventilating slit 4 is 0.10-0.20 mm, the length is 2-40 times of the width, and the center distance is 25-50 mm. The area ratio of the air permeable slits to the upper surface of the air permeable brick is 1: 125-200.

Example 3

As shown in fig. 3, the present embodiment provides a ventilating device for bottom blowing of a hot-metal ladle, which includes a hot-metal ladle 1, wherein the bottom of the hot-metal ladle 1 is filled with a refractory castable 2, and 1 bottom-blowing or side-blowing air brick 3 is further built in the refractory castable 2.

Preferably, as shown in fig. 2, each of the air bricks 3 is provided with an air slit 4 for independent passage. Wherein, the width of the ventilating slit 4 is 0.10-0.20 mm, the length is 2-40 times of the width, and the center distance is 25-50 mm. The area ratio of the air slits 4 to the upper surface of the air brick is 1: 125-200.

Example 4

As shown in fig. 4, the present embodiment provides a ventilating device for side blowing of a hot-metal ladle, which comprises a hot-metal ladle 1, wherein the side of the hot-metal ladle 1 is filled with refractory castable 2, and 1 bottom-blowing or side-blowing ventilating brick 3 is also built in the refractory castable 2.

Preferably, as shown in fig. 2, each of the air bricks 3 is provided with an air slit 4 for independent passage. Wherein, the width of the ventilating slit 4 is 0.10-0.20 mm, the length is 2-40 times of the width, and the center distance is 25-50 mm. The area ratio of the air slits 4 to the upper surface of the air brick is 1: 125-200.

The foregoing embodiments and description have been presented only to illustrate the principles and preferred embodiments of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed.