阅读说明：本技术 一种锆铬质引流砂 (Zirconium-chromium drainage sand ) 是由 贺俊海 查群群 沈占驹 沈寅 于 2021-03-25 设计创作，主要内容包括：一种锆铬质引流砂,由5～48wt%的锆英砂、15～50wt%的铬矿砂、5～35wt%沙漠砂、1-10%wt电熔镁砂、0-10 wt%莫来石、0.1～1wt%的炭黑组成。本发明锆英砂中ZrO-2耐火度高,比重大,高温性能稳定,抗侵蚀性能好；铬矿砂中Cr-2O-3与镁砂MgO反应可以生成镁铝尖晶石,高温性能稳定；莫来石与沙漠砂二氧化硅反应生成富硅莫来石,在碱性环境中更易保持高温抗侵蚀性能,能够有效地抵抗钢水在VD等精炼下长时间高温和侵蚀,保证钢水质量和连铸安全生产,能够有效地提高VD等精炼钢种钢包自动开浇率。通过使用本发明的产品,钢包自动开浇率可达到99%以上,保证了钢水质量及连铸工艺安全连续生产。(The zirconium-chromium drainage sand comprises 5-48 wt% of zircon sand, 15-50wt% of chromium ore sand, 5-35 wt% of desert sand, 1-10 wt% of fused magnesia, 0-10 wt% of mullite and 0.1-1 wt% of carbon black. ZrO in zircon sand of the invention 2 The fire resistance is high, the specific gravity is large, the high-temperature performance is stable, and the erosion resistance is good; cr in chromium ore 2 O 3 The magnesia-alumina spinel can be generated by reaction with magnesia MgO, and has stable high-temperature performance; the mullite reacts with the desert sand silica to generate silicon-rich mullite, so that the high-temperature erosion resistance is easier to maintain in an alkaline environment, the high-temperature and erosion resistance of the molten steel under VD and other refining conditions for a long time can be effectively resisted, the quality of the molten steel and the continuous casting safety production are ensured, and the automatic ladle casting rate of VD and other refining steel varieties can be effectively improved. By using the product of the invention, the automatic casting rate of the steel ladle can reach more than 99 percent, and the quality of molten steel and the safety of the continuous casting process are ensuredAnd (4) full-continuous production.)

1. The zirconium-chromium drainage sand is characterized by being prepared from the following raw materials in percentage by weight:

5-48 wt% of zircon sand;

15-50wt% of chromium ore;

5-35 wt% of desert sand;

1-10% of fused magnesia;

0-10% of mullite;

0.1-1 wt% of carbon black.

2. The chrome zirconium drainage sand of claim 1, which is prepared from the following raw materials in percentage by weight:

5-25 wt% of zircon sand;

35-50 wt% of chromium ore;

15-35 wt% of quartz sand;

1-5% of fused magnesia;

0-5% of mullite;

0.1-1 wt% of carbon black.

3. The chrome zirconium drainage sand of claim 1, which is prepared from the following raw materials in percentage by weight:

25-35 wt% of zircon sand;

30-50 wt% of chromium ore;

10-30 wt% of desert sand;

3-7% of fused magnesia;

1-4% of mullite;

0.1-1 wt% of carbon black.

4. The chrome zirconium drainage sand of claim 1, which is prepared from the following raw materials in percentage by weight:

35-48 wt% of zircon sand;

20-45 wt% of chromium ore sand;

5-25 wt% of desert sand;

4-9% of fused magnesia;

3-8% of mullite;

0.1-1 wt% of carbon black.

5. The chrome zirconium drainage sand of any one of claims 1 to 4, wherein: in the desert sand, particles with the particle size of 16-20 meshes are 40-55 wt%, particles with the particle size of 20-40 meshes are 40-60 wt%, and particles with the particle size of less than 40 meshes are less than 0.5 wt%.

6. The chrome zirconium drainage sand of any one of claims 1 to 4, wherein: in the fused magnesia, the mass percentage of particles with the particle size of 18-20 meshes in the total fused magnesia is 10-30 wt%, the mass percentage of particles with the particle size of 20-30 meshes in the total fused magnesia is 70-90 wt%, and the mass percentage of particles with the particle size of less than 30 meshes in the total fused magnesia is less than 1 wt%.

7. The chrome zirconium drainage sand of any one of claims 1 to 4, wherein: in the mullite sand, the mass percentage of the particles with the particle size of 18-20 meshes in the mullite sand is 60-80 wt%, the mass percentage of the particles with the particle size of 20-30 meshes in the mullite sand is 20-40 wt%, and the mass percentage of the particles with the particle size of less than 30 meshes in the mullite sand is less than 0.5 wt%.

8. The chrome zirconium drainage sand of any one of claims 1 to 4, wherein: the fixed C content of the carbon black is more than 98.5wt%, and the water content is less than 0.2 wt%.

Technical Field

The invention belongs to the field of metallurgy, and relates to drainage sand, in particular to zirconium-chromium drainage sand.

Background

The variety of Chinese high-quality steel is increased, and the molten steel in a ladle is required to be refined by VD and the like, so that the molten steel is stirred in the ladle in vacuum, and the refining temperature is higher and higher. In order to ensure the quality of the steel billet and the safe and continuous production of continuous casting, higher requirements are put forward on the drainage sand in the steel ladle.

At present, drainage sand provided by domestic drainage sand manufacturers is mainly chromium drainage sand. The chromium drainage sand is mainly prepared from imported chromium ore sand, quartz sand and carbonaceous additive. Although the chrome drainage sand has a high self-opening rate for steel ladles of steel types subjected to general refining treatment, for steel ladles refined by VD and the like, due to vacuum stirring treatment, the refining temperature is higher and higher, the drainage sand is consumed quickly, and the steel ladles cannot be automatically poured.

Under the condition, in the steel industry, no specially designed refined steel subjected to VD and the like and ladle drainage sand with a high casting rate exist during smelting, so that the problems of low automatic casting rate, excessive oxygen burning, high price, high energy consumption and the like of the refined steel ladle subjected to VD and the like are caused, and huge economic loss is brought to enterprises. According to the existing problems, the zirconium-chromium drainage sand is developed aiming at the practical situation of a steel mill, so that the aim of improving the automatic casting rate of refined steel ladles such as VD (vacuum distillation) is fulfilled.

Disclosure of Invention

The invention aims to provide zirconium-chromium drainage sand which aims to solve the technical problems of low automatic casting rate, excessive oxygen burning, high price and high energy consumption of refined steel ladles subjected to VD and the like in the existing mechanism.

The invention provides zirconium-chromium drainage sand which is prepared from the following raw materials in percentage by weight:

5-48 wt% of zircon sand;

15-50wt% of chromium ore;

5-35 wt% of desert sand;

1-10% of fused magnesia;

0-10% of mullite;

0.1-1 wt% of carbon black.

Further, the high-grade chromium drainage sand for the steel ladle is prepared from the following raw materials in percentage by weight:

5-25 wt% of zircon sand;

35-50 wt% of chromium ore;

15-35 wt% of quartz sand;

1-5% of fused magnesia;

0-5% of mullite;

0.1-1 wt% of carbon black.

Further, the high-grade chromium drainage sand for the steel ladle is prepared from the following raw materials in percentage by weight:

25-35 wt% of zircon sand;

30-50 wt% of chromium ore;

10-30 wt% of desert sand;

3-7% of fused magnesia;

1-4% of mullite;

0.1-1 wt% of carbon black.

Further, the high-grade chromium drainage sand for the steel ladle is prepared from the following raw materials in percentage by weight:

35-48 wt% of zircon sand;

20-45 wt% of chromium ore sand;

5-25 wt% of desert sand;

4-9% of fused magnesia;

3-8% of mullite;

0.1-1 wt% of carbon black.

Furthermore, in the desert sand, the mass percentage of particles with the particle size of 40 meshes in the total desert sand is 30-60 wt%, and the mass percentage of particles with the particle size of less than 40 meshes in the total desert sand is less than 8 wt%.

Further, in the fused magnesite, the mass percentage of particles with the particle size of 18-20 meshes in the total fused magnesite is 10-30 wt%, the mass percentage of particles with the particle size of 20-30 meshes in the total fused magnesite is 70-90 wt%, and the mass percentage of particles with the particle size of less than 30 meshes in the total fused magnesite is less than 1 wt%.

Further, in the mullite sand, the particles with the particle size of 18-20 meshes account for 60-80 wt% of the mullite sand, the particles with the particle size of 20-30 meshes account for 20-40 wt% of the mullite sand, and the particles with the particle size of less than 30 meshes account for less than 0.5wt% of the mullite sand.

Preferably, the SiO of the desert sand₂The content is more than or equal to 95.0 wt%; the desert sand grain composition is as follows: the 16-20 mesh particles are 40-55 wt% and 20-40 meshThe particles are 40-60 wt%, and the particles smaller than 40 meshes are less than 0.5 wt%.

Further, the fixed C content of the carbon black is more than 99wt%, and the water content is less than 0.2 wt%.

The raw materials of the invention consist of zircon sand, chrome ore sand, desert sand, fused magnesia and mullite; the melting point is 1750-1900 ℃, and the fireproof degree is high; ZrO in zircon sand₂The fire resistance is high, the specific gravity is large, the high-temperature performance is stable, and the erosion resistance is good; cr (chromium) component₂O₃The magnesium aluminate spinel can be generated by reaction with MgO, and the high-temperature performance is stable; the mullite reacts with the silicon dioxide to generate silicon-rich mullite, so that the high-temperature corrosion resistance is easier to maintain in an alkaline environment, the high-temperature corrosion resistance of the molten steel for a long time under VD refining can be effectively resisted, and the quality of the molten steel and the safe production of continuous casting are ensured.

Compared with the prior art, the invention has the advantages of positive and obvious technical effect. The zirconium-chromium-based flow guide sand has the advantages of strong molten steel erosion resistance, good molten steel permeability resistance, high stacking density and large specific gravity, and can effectively improve the automatic casting rate of a multi-refining ladle. By using the product of the invention, the automatic casting rate of the ladle can reach more than 99 percent, thereby ensuring the molten steel quality of refined steel after VD and the safe and continuous production of the continuous casting process, and being suitable for refining the ladle by VD and the like.

Detailed Description

The invention will be further described with reference to specific embodiments, without limiting the scope of the invention:

to avoid repetition, the raw materials in the embodiments are described uniformly as follows:

ZrO in zircon sand₂The content is more than or equal to 64 percent, and the granularity is 50-120 meshes;

cr of chromium ore₂O₃The content is more than or equal to 45.5wt%, and the particle size of the particles is 20-70 meshes;

SiO of desert sand₂The content is more than or equal to 95wt%, and the desert sand grain composition is as follows: the content of particles with 16-20 meshes is 40-55 wt%, the content of particles with 20-40 meshes is 40-60 wt%, and the content of particles smaller than 40 meshes is less than 0.5 wt%;

the MgO content of the fused magnesia is more than or equal to 96wt%, and the grading of the fused magnesia is as follows: 10-30 wt% of particles with 18-20 meshes, 70-90 wt% of particles with 20-30 meshes and less than 1wt% of particles with less than 30 meshes;

mullite of Al₂O₃The content is more than or equal to 73wt percent and SiO₂Content is less than or equal to 25wt%, Fe₂O₃Less than or equal to 2.5wt%, and mullite sand grain composition is as follows: the particle size of 18-20 meshes is 60-80 wt%, the particle size of 20-30 meshes is 20-40 wt%, and the particle size smaller than 30 meshes is less than 0.5 wt%;

the fixed C content of the carbon black is more than 99wt%, and the water content is less than 0.2 wt%. The detailed description is omitted in the embodiments.

Example 1

A zirconium-chromium drainage sand comprises: adopting 5-25 wt% of zircon sand; the material is prepared by mixing and stirring 35-60 wt% of chromium ore sand, 15-35 wt% of desert sand, 1-5 wt% of fused magnesia, 0-5 wt% of mullite and 0.1-1 wt% of carbon black.

The statistical number of the furnaces of the zirconium-chromium drainage sand prepared by the embodiment is 1022; the number of the casting furnaces is 1019; the automatic casting rate is 99.7%.

Example 2

A zirconium-chromium drainage sand comprises: adopting 25-35 wt% of zircon sand; 30-50 wt% of chromium ore sand, 10-30 wt% of desert sand, 3-7 wt% of fused magnesia, 1-4 wt% of mullite and 0.1-1 wt% of carbon black.

The statistics of the furnace number of the zirconium-chromium drainage sand prepared by the embodiment is 1077 furnaces; the number of casting furnaces is 1071; the automatic casting rate is 99.4%.

Example 3

A zirconium-chromium drainage sand comprises: adopting 35-48 wt% of zircon sand; 20-45 wt% of chromium ore sand, 5-25 wt% of desert sand, 4-9 wt% of fused magnesia, 3-8 wt% of mullite and 0.1-1 wt% of carbon black.

The statistical number of the furnaces of the zirconium-chromium drainage sand prepared by the embodiment is 998; the number of the casting furnaces is 994; the automatic casting rate is 99.5%.