阅读说明：本技术 一种脱氧造渣材料及其制备方法 (Deoxidizing and slagging material and preparation method thereof ) 是由 田银良 邓家祥 郭彦龙 刘云 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种脱氧造渣材料及其制备方法,该材料中各成分的质量百分比为：20-40％的铝粉、20-40％的氧化钙、0.1-10％的碳化硼、0.1-10％的氟化钙、0.1-10％的氧化钠,余量为二氧化硅。该材料的制备方法为：将氧化钙粉与水混合搅拌均匀制成氧化钙浆；将铝粉加入到氧化钙浆中,并充分混合搅拌均匀,待冷却后经烘干破碎得到多孔状颗粒物；将颗粒状的碳化硼、氟化钙和二氧化硅与多孔状及氧化钠充分混合,得到目标产物。本发明脱氧造渣材料,脱氧效果好且成渣快易清理。(The invention discloses a deoxidation slagging material and a preparation method thereof, wherein the material comprises the following components in percentage by mass: 20-40% of aluminum powder, 20-40% of calcium oxide, 0.1-10% of boron carbide, 0.1-10% of calcium fluoride, 0.1-10% of sodium oxide and the balance of silicon dioxide. The preparation method of the material comprises the following steps: mixing calcium oxide powder with water, and stirring to obtain calcium oxide slurry; adding aluminum powder into the calcium oxide slurry, fully mixing and stirring uniformly, cooling, drying and crushing to obtain porous particles; fully mixing granular boron carbide, calcium fluoride and silicon dioxide with porous sodium oxide to obtain the target product. The deoxidation slagging material has good deoxidation effect and quick slagging and is easy to clean.)

1. The deoxidation slagging material is characterized by comprising the following components in percentage by mass:

20-40% of aluminum powder, 20-40% of calcium oxide, 0.1-10% of boron carbide, 0.1-10% of calcium fluoride, 0.1-10% of sodium oxide and the balance of silicon dioxide.

2. The deoxidation slagging material of claim 1, wherein: the deoxidation slagging material comprises the following components in percentage by mass: 30 percent of aluminum powder, 30 percent of calcium oxide, 7.5 percent of boron carbide, 5 percent of calcium fluoride, 2.5 percent of sodium oxide and the balance of silicon dioxide.

3. A deoxidising slag forming material according to claim 1 or 2, wherein: the sodium oxide and the calcium oxide are both powder, and the boron carbide, the calcium fluoride and the silicon dioxide are all granular.

4. A preparation method of a deoxidation slagging material is characterized by comprising the following steps:

step 1, mixing and stirring calcium oxide powder and water uniformly according to a mass ratio of 1: 0.5-1.5 to prepare calcium oxide slurry;

step 2, adding aluminum powder into the calcium oxide slurry prepared in the step 1 according to the formula proportion of the deoxidizing and slagging material in the claim 1 or 2, fully mixing and stirring uniformly, and drying and crushing after cooling to obtain porous particles;

and 3, fully mixing granular boron carbide, calcium fluoride and silicon dioxide with the porous materials and sodium oxide prepared in the step 2 according to the formula proportion of the deoxidation slagging materials in the claim 1 or 2 to obtain a target product.

5. The method for preparing a deoxidation slagging material as claimed in claim 4, wherein: the drying temperature in the step 2 is 400-600 ℃, and the drying time is more than 2 hours.

Technical Field

The invention relates to a deoxidizing and slagging material and a preparation method thereof, belonging to the field of casting metallurgy.

Background

As is well known, impurities and oxygen in steel have great harm to castings, and non-metallic inclusions are easily generated in the castings, so that the continuity of the casting matrix is damaged, and the mechanical properties of the castings, such as strength, toughness and the like, are influenced. The combination of oxygen and carbon/nitrogen in steel is easy to form bubbles in the casting, so that the casting has the defects of air holes and the like, and even the casting is scrapped. In order to ensure the quality of the casting, a certain amount of deoxidation and slagging materials are added into the molten steel in the smelting process of the casting molten steel or during tapping. At present, many deoxidation slagging materials are used for smelting molten steel in the market, but the deoxidation procedure and the slagging procedure are separately operated. The materials required for the deoxygenation process are typically: ferrosilicon, ferromanganese, calcium silicon, aluminum wire and the like, and the materials required by the slagging process are usually: calcium oxide, silicon dioxide, aluminum oxide and the like are added in a smelting process, the operation is troublesome, some steel types have requirements on the adding sequence of the deoxidizing and slagging materials, otherwise, the deoxidizing effect is influenced, so that the smelting operation skill has higher requirements, if a material which can deoxidize and slagging is available, the deoxidizing and slagging process can be simplified, the labor intensity is reduced, and the problems encountered in the current smelting are solved.

Disclosure of Invention

The invention aims to solve the problems that the deoxidation process and the slagging process are separately operated in the traditional molten steel smelting process, the types of deoxidation materials and slagging materials are various, the operation is troublesome and the like, and provides a deoxidation slagging material and a preparation method thereof.

The purpose of the invention is realized by the following technical scheme:

the invention relates to a deoxidation slagging material, which comprises the following components in percentage by mass:

20-40% of aluminum powder, 20-40% of calcium oxide, 0.1-10% of boron carbide, 0.1-10% of calcium fluoride, 0.1-10% of sodium oxide and the balance of silicon dioxide;

the sodium oxide and the calcium oxide are both powder, and the boron carbide, the calcium fluoride and the silicon dioxide are all granular.

Further, the deoxidation slagging material comprises the following components in percentage by mass: 30 percent of aluminum powder, 30 percent of calcium oxide, 7.5 percent of boron carbide, 5 percent of calcium fluoride, 2.5 percent of sodium oxide and the balance of silicon dioxide.

The preparation method of the deoxidation slagging material specifically comprises the following steps:

step 1, mixing and stirring calcium oxide powder and water uniformly according to a mass ratio of 1: 0.5-1.5 to prepare calcium oxide slurry;

step 2, adding aluminum powder into the calcium oxide slurry prepared in the step 1 according to the formula proportion, fully mixing and stirring uniformly, cooling, and drying and crushing to obtain porous particles;

and 3, fully mixing granular boron carbide, calcium fluoride and silicon dioxide with the porous and sodium oxide prepared in the step 2 according to the formula proportion to obtain a target product.

Further, the drying temperature in the step 2 is 400-600 ℃, and the drying time is more than 2 hours.

Advantageous effects

The silicon dioxide and the sodium oxide in the deoxidizing slagging material can directly form low-melting-point silicate at the initial stage of adding, quickly cover the whole surfaces of the slag and the molten steel, isolate air, reduce oxygen and water in the air from entering the slag and the molten steel to participate in reaction, improve the full reaction of deoxidizing components in the deoxidizing slagging material and oxygen in the steel, and improve the deoxidizing effect.

According to the invention, the porous particles are prepared from the aluminum powder and the calcium oxide, so that the contact area can be increased, and the reaction speed of the aluminum powder is slowed down under the wrapping of the calcium oxide, so that the deoxidation effect is better.

The deoxidizing and slagging material provided by the invention is added with fluoride and boride, so that the deoxidizing effect is good, the slagging speed is high, and the slag is easy to clean.

The silicon dioxide in the deoxidizing and slagging material can also be combined with the metal oxide in the slag to synthesize the low-melting-point silicate, the time required by the oxygen ions in the molten steel to diffuse into the slag is shortened, the steelmaking efficiency is improved, and the cost is saved.

Detailed Description

The present invention will be further described with reference to the following examples.

Examples

The deoxidation slagging material specifically comprises the following steps:

step 1, fully mixing and uniformly stirring 30Kg of calcium oxide and 30Kg of water to prepare calcium oxide slurry;

step 2, adding 30Kg of aluminum powder into the calcium oxide slurry prepared in the step 1, fully mixing and stirring uniformly, cooling, and keeping the temperature in a resistance furnace at 500 ℃ for 4 hours, drying and crushing to form porous particles;

and 3, processing 7.5Kg of boron carbide, 5Kg of calcium fluoride and 25Kg of silicon dioxide into granules, and fully mixing the granules with the porous granules prepared in the step 2 and 2.5Kg of sodium oxide.