CN109457080B - Steelmaking accelerant - Google Patents

Abstract

A steel-making accelerant is characterized in that: the steel-making promoter has a chemical composition containing Al₂O₃Al powder, Mn powder, Ca powder, CaO, Si powder, SiO powder₂Fe + C + N + P + S + O is less than or equal to 6 percent; the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

Description

Steelmaking accelerant

Technical Field

The invention belongs to the technical field of steel smelting, and particularly relates to a steelmaking accelerant.

Background

The metallurgical industry consumes a large amount of material resources and energy sources and produces a large amount of solid waste, and metallurgical slag is the main solid waste in the steel industry. Although a series of slag utilization technologies exist at present, the slag can be recycled, so that the problems of slag export and comprehensive utilization of resources are solved to a certain extent, and certain economic benefits and social benefits are obtained simultaneously

In the early 70 s of the 20 th century, the steel slag in the United states reaches the discharge balance, so that the utilization of the steel slag is realized, the steel slag is recycled, specialized and industrialized, and the historical steel slag pile is basically eliminated. Recent data statistics shows that the yield of the American steel slag is about 2000 ten thousand tons basically since 2005, the utilization amount is about 2000 ten thousand tons, and the utilization rate reaches 100 percent basically. Since 2007, the total output of the Japanese steel is basically stabilized at about 1.2 hundred million tons, and is basically recycled at 100%. About 1200 million tons of steel slag are produced annually in europe, 65% of which has been used with high efficiency, but 35% of the steel slag is piled up unused. The overall utilization efficiency of China is not high, and the method for using and recycling needs to be further developed and researched.

Similarly, the aluminum ash is a part with small quantity in solid waste generated in the electrolytic aluminum industry and the production process of aluminum materials and aluminum products, the chemical components of the aluminum ash mainly comprise Al2O3, SiO2, MgO, CaO, metallic aluminum and the like, and the proportion of the chemical components is slightly changed with different raw materials and operation conditions of various manufacturers. The aluminum ash is generally used as garbage, which pollutes the environment, needs a large amount of disposal sites and has high treatment cost. How to fully recover the main components in the aluminum ash becomes one of the important targets for the development of the recycling economy.

Disclosure of Invention

The invention solves the technical problem that a new product with good deoxidation effect and high comprehensive utilization degree of other slag is obtained by fully selecting steel slag components and aluminum ash components, and the new product is obviously different from the prior steel slag which is used for internal recycling of steel mills, engineering backfill, construction, sewage treatment, desulfurization, soil improvement and the like and the prior aluminum ash which is used as a refractory material, aluminum chloride, a desulfurizer, water glass, a silicon-aluminum-iron alloy, a reducing agent and the like. Compared with the traditional pure Al deoxidation, Ca deoxidation, Si deoxidation, AD15, AD20, AD25, AD30, AD40 and AD50, after the steel-making accelerant is used for deoxidation, the deoxidation efficiency is obviously improved firstly, the Al2O3 inclusion size is smaller, and the grain refinement of steel products produced by subsequent molten steel is obvious secondly.

The technical scheme is as follows:

1. a steel-making accelerant is characterized in that: the chemical composition of the steelmaking accelerant contains Al2O3, Al powder, Mn powder, Ca powder, CaO, Si powder, SiO2, Fe + C + N + P + S + O is less than or equal to 6 percent; the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

2. A steel-making accelerant is characterized in that: the steel-making accelerant comprises the following chemical components in percentage by mass: 330-50% of Al2O with the granularity of 1.1-1.5mm, 10-15% of Al powder with the granularity of 1.0-1.5mm, 6-14% of Mn powder with the granularity of 1.0-2.0mm, 6-13% of Ca powder with the granularity of 1.0-2.0mm, 6-12% of CaO with the granularity of 1.0-2.0mm, 6-11% of Si powder with the granularity of 1.1-1.5mm, less than 8% of SiO2 with the granularity of 1.1-1.5mm, less than 8% of MgO with the granularity of 1.1-1.5mm, 26-8% of TiO with the granularity of 0.01-0.015mm, 3-4.5% of Ba with the granularity of 1.1-1.5mm, 0.002-0.005% of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6% of Fe + C + N + P + S; the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

3. A steel-making accelerant is characterized in that: the steel-making accelerant comprises the following chemical components in percentage by mass: 330-50% of Al2O with the granularity of 1.1-1.5mm, 10-15% of Al powder with the granularity of 1.0-1.5mm, 6-14% of Mn powder with the granularity of 1.0-2.0mm, 6-13% of Ca powder with the granularity of 1.0-2.0mm, 6-12% of CaO with the granularity of 1.0-2.0mm, 6-11% of Si powder with the granularity of 1.1-1.5mm, less than 8% of SiO2 with the granularity of 1.1-1.5mm, less than 8% of MgO with the granularity of 1.1-1.5mm, 26-8% of TiO with the granularity of 0.01-0.015mm, 3-4.5% of Ba with the granularity of 1.1-1.5mm, 0.002-0.005% of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6% of Fe + C + N + P + S;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components comprise the following components in percentage by mass: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

4. Further, the steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: al2O 330% with the granularity of 1.1-1.5mm, Al powder 15% with the granularity of 1.0-1.5mm, Mn powder 9% with the granularity of 1.0-2.0mm, Ca powder 9% with the granularity of 1.0-2.0mm, CaO 9% with the granularity of 1.0-2.0mm, Si powder 9% with the granularity of 1.1-1.5mm, SiO2 less than 8% with the granularity of 1.1-1.5mm, MgO less than 8% with the granularity of 1.1-1.5mm, TiO 28% with the granularity of 0.01-0.015mm, Ba 4.5% with the granularity of 1.1-1.5mm, rare earth 0.005% with the granularity of 1.1-1.5mm, and Fe + C + N + P + S + O less than or equal to 6%;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

5. Further, the steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 340 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 10 percent of Ca powder with the granularity of 1.0-2.0mm, 9 percent of CaO with the granularity of 1.0-2.0mm, 10 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 26 percent of TiO with the granularity of 0.01-0.015mm, 3 percent of Ba with the granularity of 1.1-1.5mm, 0.002 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe, C, N, P and S;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

6. Further, the steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 345 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 8 percent of Ca powder with the granularity of 1.0-2.0mm, 8 percent of CaO with the granularity of 1.0-2.0mm, 6 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 26 percent of TiO with the granularity of 0.01-0.015mm, 3.5 percent of Ba with the granularity of 1.1-1.5mm, 0.003 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe, C, N, P and S;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

7. Further, the steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 350 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 7 percent of Mn powder with the granularity of 1.0-2.0mm, 7 percent of Ca powder with the granularity of 1.0-2.0mm, 7 percent of CaO with the granularity of 1.0-2.0mm, 7 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 27 percent of TiO with the granularity of 0.01-0.015mm, 4 percent of Ba with the granularity of 1.1-1.5mm, 0.004 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe, C, N, P and S;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

8. Further, the steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 342 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 8 percent of Ca powder with the granularity of 1.0-2.0mm, 8 percent of CaO with the granularity of 1.0-2.0mm, 8 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 26.5 percent of TiO26 with the granularity of 0.01-0.015mm, 3.8 percent of Ba with the granularity of 1.1-1.5mm, 0.003 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P +;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 2.5Kg per ton of steel.

9. Further, the steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: al2O 347% with the granularity of 1.1-1.5mm, Al powder 11% with the granularity of 1.0-1.5mm, Mn powder 6.5% with the granularity of 1.0-2.0mm, Ca powder 6.5% with the granularity of 1.0-2.0mm, CaO 6.5% with the granularity of 1.0-2.0mm, Si powder 6.5% with the granularity of 1.1-1.5mm, SiO2 less than 8% with the granularity of 1.1-1.5mm, MgO less than 8% with the granularity of 1.1-1.5mm, TiO26.5% with the granularity of 0.01-0.015mm, Ba 4% with the granularity of 1.1-1.5mm, rare earth 0.004% with the granularity of 1.1-1.5mm, and Fe + C + N + P + S + O is less than or equal to 6%;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The main functions of the raw materials are as follows:

al has very strong affinity to oxygen and is often used as a deoxidizing element for steel making, the Al is widely applied to deoxidizing steel and also has the effects of refining grains and adjusting the growth of austenite grains, but when the aluminum content in the steel is more than 0.015 percent, the Al has adverse effect on the toughness of the steel, and meanwhile, nitrides are easily formed at the grain boundary of the steel to cause the weakening of the bonding force of the grain boundary, reduce the plasticity of the steel and enhance the crack sensitivity of the steel.

Ca. Mn is a strong deoxidizing element, and since the vapor pressure of calcium is very high at steelmaking temperatures and the solubility of calcium in iron is small, it cannot be deoxidized with calcium alone, and in order to increase the solubility of calcium in iron, an alloy of calcium and other elements is required, and carbon, silicon, and aluminum can very significantly increase the solubility of calcium in steel.

Si is a strong deoxidizer, the deoxidation effect of the silicon is fast, the deoxidizer is a common deoxidizer, but the melting point of a deoxidation product SiO2 is high and is 1710 ℃, so the deoxidizer exists in a solid small particle state at a common steelmaking temperature, is difficult to float upwards and is difficult to discharge from molten steel, the silicon, aluminum and alkaline earth metal have strong capability of generating compounds, but the price of the silicon is lower, so the utilization rate of the alkaline earth metal in the steel is mainly improved by adopting the silicon, and the silicon is added into the composite deoxidizer to be combined into a silicon compound, so the evaporation loss of calcium, magnesium and barium in the using process can be reduced, and the utilization rate of the deoxidizer is improved.

Mg is a deoxidizer, and after a proper amount of magnesium is added into steel, the quantity of inclusions is obviously reduced, the form and the properties of the inclusions are improved, and the beneficial effects on the performance are achieved.

Ba is a deoxidizer, calcium-barium is in a mutual soluble state, the vapor pressure of elements in the compound is lower than that of single elements and dissolved state, and the vapor pressure of calcium can be reduced by adding barium into a calcium deoxidizer.

RE is added into the steel, the quality of the steel can be improved, wherein the application effect of rare earth deoxidation is obvious; in addition, the rare earth deoxidation product, namely the fine rare earth oxide, can be partially retained in molten steel, and the molten steel can fully play a role in refining crystal grains in the subsequent smelting, continuous casting, rolling and heat treatment processes, because the fine rare earth oxide pins a crystal boundary, the growth of a structure is inhibited, and the strength and the plasticity of the metal material are improved. Considering the production cost and the production effect of the rare earth, the rare earth is 0.002-0.005 percent in the invention, but not excessive. Similar TiO2 has similar effect, and the selected TiO2 raw material is fully ball-milled TiO 26-8% with the particle size of 0.01-0.015 mm.

As for Al2O3, CaO, SiO2 and MgO which are common steelmaking accelerant elements, the invention obviously improves the corresponding deoxidation efficiency by redesigning the raw materials, secondly, the Al2O3 inclusion has smaller size, and thirdly, the grain refinement of the steel product produced by the subsequent molten steel is obvious

Compared with the prior art, the invention has the beneficial technical effects that:

1. by fully selecting the components of the steel slag and the aluminum ash, a new product with good deoxidation effect and high comprehensive utilization degree of other slag materials is finally obtained, and the new product is obviously different from the prior steel slag which is used for internal recycling of steel mills, engineering backfilling, construction, sewage treatment, desulfurization, soil improvement and the like, and is obviously different from the prior aluminum ash which is used as a refractory material, aluminum chloride, a desulfurizer, water glass, a ferro-silico-aluminum alloy, a reducing agent and the like;

2. compared with the traditional pure Al deoxidation, Ca deoxidation and Si deoxidation, the product has lower cost, and compared with AD15, AD20, AD25, AD30, AD40 and AD50, after the steel-making accelerant is used for deoxidation, the deoxidation efficiency is obviously improved firstly, the Al2O3 inclusion has smaller size, and the grain refinement of steel products produced by subsequent molten steel is obvious secondly.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the specific embodiments.

Example 1

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: al2O 330% with the granularity of 1.1-1.5mm, Al powder 15% with the granularity of 1.0-1.5mm, Mn powder 9% with the granularity of 1.0-2.0mm, Ca powder 9% with the granularity of 1.0-2.0mm, CaO 9% with the granularity of 1.0-2.0mm, Si powder 9% with the granularity of 1.1-1.5mm, SiO2 less than 8% with the granularity of 1.1-1.5mm, MgO less than 8% with the granularity of 1.1-1.5mm, TiO 28% with the granularity of 0.01-0.015mm, Ba 4.5% with the granularity of 1.1-1.5mm, rare earth 0.005% with the granularity of 1.1-1.5mm, and Fe + C + N + P + S + O less than or equal to 6%;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 220ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 40ppm, and the total oxygen deoxidation rate is 81.82%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 8.2 percent of the total amount of the inclusions.

Example 2

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 340 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 10 percent of Ca powder with the granularity of 1.0-2.0mm, 9 percent of CaO with the granularity of 1.0-2.0mm, 10 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 26 percent of TiO with the granularity of 0.01-0.015mm, 3 percent of Ba with the granularity of 1.1-1.5mm, 0.002 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe, C, N, P and S;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 215ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 35ppm, and the total oxygen deoxidation rate is 83.72%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 8 percent of the total amount of the inclusions

Example 3

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 342 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 8 percent of Ca powder with the granularity of 1.0-2.0mm, 8 percent of CaO with the granularity of 1.0-2.0mm, 8 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 26.5 percent of TiO26 with the granularity of 0.01-0.015mm, 3.8 percent of Ba with the granularity of 1.1-1.5mm, 0.003 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P +;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 218ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 30ppm, and the total oxygen deoxidation rate is 86.24%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 7.8 percent of the total amount of the inclusion

Example 4

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 345 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 8 percent of Ca powder with the granularity of 1.0-2.0mm, 8 percent of CaO with the granularity of 1.0-2.0mm, 6 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 26 percent of TiO with the granularity of 0.01-0.015mm, 3.5 percent of Ba with the granularity of 1.1-1.5mm, 0.003 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe, C, N, P and S;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 224ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 32ppm, and the total oxygen deoxidation rate is 85.71 percent. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 7.6 percent of the total amount of the inclusions

Example 5

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: al2O 347% with the granularity of 1.1-1.5mm, Al powder 11% with the granularity of 1.0-1.5mm, Mn powder 6.5% with the granularity of 1.0-2.0mm, Ca powder 6.5% with the granularity of 1.0-2.0mm, CaO 6.5% with the granularity of 1.0-2.0mm, Si powder 6.5% with the granularity of 1.1-1.5mm, SiO2 less than 8% with the granularity of 1.1-1.5mm, MgO less than 8% with the granularity of 1.1-1.5mm, TiO26.5% with the granularity of 0.01-0.015mm, Ba 4% with the granularity of 1.1-1.5mm, rare earth 0.004% with the granularity of 1.1-1.5mm, and Fe + C + N + P + S + O is less than or equal to 6%;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 217ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 30ppm, and the total oxygen deoxidation rate is 86.18%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 7.7 percent of the total amount of the inclusion

Example 6

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 350 percent of Al2O with the granularity of 1.1-1.5mm, 10 percent of Al powder with the granularity of 1.0-1.5mm, 7 percent of Mn powder with the granularity of 1.0-2.0mm, 7 percent of Ca powder with the granularity of 1.0-2.0mm, 7 percent of CaO with the granularity of 1.0-2.0mm, 7 percent of Si powder with the granularity of 1.1-1.5mm, less than 8 percent of SiO2 with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 1.1-1.5mm, 27 percent of TiO with the granularity of 0.01-0.015mm, 4 percent of Ba with the granularity of 1.1-1.5mm, 0.004 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe, C, N, P and S;

the Al2O3, CaO, SiO2, MgO and TiO2 components are selected from steel slag or aluminum ash or a mixture of the steel slag and the aluminum ash, and the steel slag components are calculated according to the mass percentage: 40-50% of CaO, 220-30% of SiO, 6-10% of MgO, 78-5% of Al2O33, 45-8% of Fe3O, 1-2% of FeO, 26-2% of Fe2O 31, 0.5-1% of MnO, 20.5-1% of TiO20, and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: 35-40% of Al2O3, 15-30% of Al, 5-15% of SiO2, 5-15% of MgO, 5-10% of TiO2, 1-5% of Fe-containing oxide and 2-6% of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 216ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 33ppm, and the total oxygen deoxidation rate is 84.72 percent. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 8.1 percent of the total amount of the inclusions

Comparative example 1

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: al2O330 with the granularity of 1.1-1.5mm, Al powder 25 with the granularity of 1.0-1.5mm, Mn powder 12 with the granularity of 1.0-2.0mm, Ca powder 9 with the granularity of 1.0-2.0mm, CaO 9 with the granularity of 1.0-2.0mm, Si powder 9 with the granularity of 1.1-1.5mm, SiO2 with the granularity of 1.1-1.5mm is less than 8%, MgO with the granularity of 1.1-1.5mm is less than 8%, and Fe + C + N + P + S + O is less than or equal to 6%;

the results were: the total oxygen content before adding the steel-making accelerant is 220ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 65ppm, and the total oxygen deoxidation rate is 70.45%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 14.5 percent of the total amount of the inclusions.

Comparative example 2

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: al2O351 with the granularity of 1.1-1.5mm, Al powder 10 with the granularity of 1.0-1.5mm, Mn powder 12 with the granularity of 1.0-2.0mm, Ca powder 6 with the granularity of 1.0-2.0mm, CaO 6 with the granularity of 1.0-2.0mm, Si powder 6 with the granularity of 1.1-1.5mm, SiO2 with the granularity of 1.1-1.5mm is less than 8%, MgO with the granularity of 1.1-1.5mm is less than 8%, and Fe + C + N + P + S + O is less than or equal to 6%;

the results were: the total oxygen content before adding the steel-making accelerant is 218ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 60ppm, and the total oxygen deoxidation rate is 72.48%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 14 percent of the total amount of the inclusions.

Comparative example 3

The steelmaking accelerant comprises the following chemical components in percentage by mass: 340 percent of Al2O with the granularity of 1.1-1.5mm, 15 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 9 percent of CaO with the granularity of 1.0-2.0mm, 7 percent of Si powder with the granularity of 1.1-1.5mm, 210 percent of SiO with the granularity of 1.1-1.5mm, 6 percent of MgO with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P + S + O;

the results were: the total oxygen content before adding the steel-making accelerant is 216ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 50ppm, and the total oxygen deoxidation rate is 76.85%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 13.3 percent of the total amount of the inclusions.

Comparative example 4

The steelmaking accelerant comprises the following chemical components in percentage by mass: al2O 340% with the granularity of 1.1-1.5mm, Al powder 10% with the granularity of 1.0-1.5mm, Mn powder 8% with the granularity of 1.0-2.0mm, Ca powder 10% with the granularity of 1.0-2.0mm, CaO 9% with the granularity of 1.0-2.0mm, Si powder 10% with the granularity of 1.1-1.5mm, SiO2 less than 8% with the granularity of 1.1-1.5mm, MgO less than 8% with the granularity of 1.1-1.5mm, TiO 26% with the granularity of 0.01-0.015mm, and Fe + C + N + P + S + O are less than or equal to 6%;

the results were: the total oxygen content before adding the steel-making accelerant is 217ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 46ppm, and the total oxygen deoxidation rate is 78.8 percent. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 13.4 percent of the total amount of the inclusions.

Comparative example 5

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: al2O330 with the granularity of 1.1-1.5mm, Al powder 25 with the granularity of 1.0-1.5mm, Mn powder 12 with the granularity of 1.0-2.0mm, Ca powder 4 with the granularity of 1.0-2.0mm, CaO 3 with the granularity of 1.0-2.0mm, Si powder 3 with the granularity of 1.1-1.5mm, SiO 211 with the granularity of 1.1-1.5mm, MgO11 with the granularity of 1.1-1.5mm, and Fe + C + N + P + S + O is less than or equal to 3 percent;

the results were: the total oxygen content before adding the steel-making accelerant is 222ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 60ppm, and the total oxygen deoxidation rate is 72.97%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 14.7 percent of the total amount of the inclusions.

Comparative example 6

The steel-making accelerant is characterized by comprising the following chemical components in percentage by mass: 342 percent of Al2O with the granularity of 2.1-2.5mm, 10 percent of Al powder with the granularity of 2.1-2.5mm, 8 percent of Mn powder with the granularity of 2.1-2.5mm, 8 percent of Ca powder with the granularity of 2.1-2.5mm, 8 percent of CaO with the granularity of 2.1-2.5mm, 8 percent of Si powder with the granularity of 2.1-2.5mm, less than 8 percent of SiO2 with the granularity of 2.1-2.5mm, less than 8 percent of MgO with the granularity of 2.1-2.5mm, 26.5 percent of TiO26 with the granularity of 0.01-0.015mm, 3.8 percent of Ba with the granularity of 2.1-2.5mm, 0.003 percent of rare earth with the granularity of 2.1-2.5mm, and less than or equal to 6 percent of Fe + C + N + P +;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 219ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 45ppm, and the total oxygen deoxidation rate is 79.45%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 12.1 percent of the total amount of the inclusions.

Comparative example 7

AD15, AD20, AD25, AD30, AD40 and AD50 are used as steelmaking accelerators, and the addition amount of the steelmaking accelerators in steelmaking is 2 Kg/ton of steel.

The results were: the total oxygen content before adding the steel-making accelerant is 220 plus or minus 2ppm, the total oxygen content after adding the steel-making accelerant and fully deoxidizing is 55 plus or minus 2ppm, and the total oxygen deoxidation rate is 73.85-76.13%. The size of the Al2O3 inclusion is more than or equal to 30 microns and accounts for 14.1-15.3% of the total amount of the inclusions.

The product is obviously lower in cost compared with the traditional pure Al deoxidation, Ca deoxidation and Si deoxidation, and compared with AD15, AD20, AD25, AD30, AD40 and AD50, after the steelmaking accelerant is used for deoxidation, the deoxidation efficiency is obviously improved, the Al2O3 inclusion is smaller in size, and the grain refinement of steel products produced by subsequent molten steel is obvious. Compared with the steelmaking accelerant which has the similar component types and proportion relation within the range of the invention, the steelmaking accelerant has the advantages of obviously improved deoxidation efficiency and smaller size of inclusions due to the specific components and the specific proportion.

The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (7)

1. A steel-making accelerant is characterized in that: the steel-making accelerant comprises the following chemical components in percentage by mass: al with particle size of 1.1-1.5mm₂O₃30-50 percent of Al powder with the granularity of 1.0-1.5mm, 6-14 percent of Mn powder with the granularity of 1.0-2.0mm, 6-13 percent of Ca powder with the granularity of 1.0-2.0mm, 6-12 percent of CaO with the granularity of 1.0-2.0mm, 6-11 percent of Si powder with the granularity of 1.1-1.5mm and 1.1-1.5mm of SiO powder₂Less than 8 percent of TiO with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 0.01-0.015mm₂B with 6-8% and 1.1-1.5mm particle sizea 3-4.5%, rare earth with the granularity of 1.1-1.5mm 0.002-0.005%, Fe + C + N + P + S + O less than or equal to 6%; al (Al)₂O₃、CaO、SiO₂、MgO、TiO₂The steel slag comprises the following components in percentage by mass: CaO 40-50%, SiO₂ 20-30％、MgO 6-10％、Al₂O₃ 3-5％、Fe3O4 5-8％、FeO 1-2％、Fe₂O₃ 1-2％、MnO 0.5-1％、TiO₂0.5-1% and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: al (Al)₂O₃35-40% of Al, 15-30% of SiO₂5-15% of MgO, 5-15% of TiO₂5-10% of content, 1-5% of content of Fe-containing oxide and 2-6% of content of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

2. The steelmaking accelerant of claim 1, wherein the steelmaking accelerant comprises the following chemical compositions in percentage by mass: al with particle size of 1.1-1.5mm₂O₃30 percent of Al powder with the granularity of 1.0-1.5mm, 9 percent of Mn powder with the granularity of 1.0-2.0mm, 9 percent of Ca powder with the granularity of 1.0-2.0mm, 9 percent of CaO with the granularity of 1.0-2.0mm, 9 percent of Si powder with the granularity of 1.1-1.5mm, and 1.1-1.5mm of SiO powder₂Less than 8 percent of TiO with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 0.01-0.015mm₂8 percent of Ba with the granularity of 1.1-1.5mm, 0.005 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P + S + O;

Al₂O₃、CaO、SiO₂、MgO、TiO₂the steel slag comprises the following components in percentage by mass: CaO 40-50%, SiO₂ 20-30％、MgO 6-10％、Al₂O₃ 3-5％、Fe3O4 5-8％、FeO 1-2％、Fe₂O₃ 1-2％、MnO 0.5-1％、TiO₂0.5-1% and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: al (Al)₂O₃35-40% of Al, 15-30% of SiO₂5-15% of MgO, 5-15% of TiO₂5-10% of content, 1-5% of content of Fe-containing oxide and 2-6% of content of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

3. The steelmaking accelerant of claim 1, wherein the steelmaking accelerant comprises the following chemical compositions in percentage by mass: al with particle size of 1.1-1.5mm₂O₃40 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 10 percent of Ca powder with the granularity of 1.0-2.0mm, 9 percent of CaO with the granularity of 1.0-2.0mm, 10 percent of Si powder with the granularity of 1.1-1.5mm, and 1.1-1.5mm of SiO powder₂Less than 8 percent of TiO with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 0.01-0.015mm₂6 percent of Ba 3 percent with the granularity of 1.1-1.5mm, 0.002 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P + S + O; al (Al)₂O₃、CaO、SiO₂、MgO、TiO₂The steel slag comprises the following components in percentage by mass: CaO 40-50%, SiO₂ 20-30％、MgO 6-10％、Al₂O₃ 3-5％、Fe3O4 5-8％、FeO 1-2％、Fe₂O₃ 1-2％、MnO 0.5-1％、TiO₂0.5-1% and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: al (Al)₂O₃35-40% of Al, 15-30% of SiO₂5-15% of MgO, 5-15% of TiO₂5-10% of content, 1-5% of content of Fe-containing oxide and 2-6% of content of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

4. The steelmaking accelerant of claim 1, wherein the steelmaking accelerant comprises the following chemical compositions in percentage by mass: al with particle size of 1.1-1.5mm₂O₃45 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm and 1.0-2.0m8 percent of Ca powder with the particle size of 1.0-2.0mm, 8 percent of CaO with the particle size of 1.1-1.5mm, 6 percent of Si powder with the particle size of 1.1-1.5mm and SiO with the particle size of 1.1-1.5mm₂Less than 8 percent of TiO with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 0.01-0.015mm₂6 percent of Ba with the granularity of 1.1-1.5mm, 0.003 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P + S + O;

Al₂O₃、CaO、SiO₂、MgO、TiO₂the steel slag comprises the following components in percentage by mass: CaO 40-50%, SiO₂ 20-30％、MgO 6-10％、Al₂O₃ 3-5％、Fe3O4 5-8％、FeO 1-2％、Fe₂O₃ 1-2％、MnO 0.5-1％、TiO₂0.5-1% and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: al (Al)₂O₃35-40% of Al, 15-30% of SiO₂5-15% of MgO, 5-15% of TiO₂5-10% of content, 1-5% of content of Fe-containing oxide and 2-6% of content of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

5. The steelmaking accelerant of claim 1, wherein the steelmaking accelerant comprises the following chemical compositions in percentage by mass: al with particle size of 1.1-1.5mm₂O₃50 percent of Al powder with the granularity of 1.0-1.5mm, 7 percent of Mn powder with the granularity of 1.0-2.0mm, 7 percent of Ca powder with the granularity of 1.0-2.0mm, 7 percent of CaO with the granularity of 1.0-2.0mm, 7 percent of Si powder with the granularity of 1.1-1.5mm, and 7 percent of SiO powder with the granularity of 1.1-1.5mm₂Less than 8 percent of TiO with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 0.01-0.015mm₂7 percent of Ba with the granularity of 1.1-1.5mm, 0.004 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P + S + O;

Al₂O₃、CaO、SiO₂、MgO、TiO₂the steel slag comprises the following components in percentage by mass: CaO 40-50%, SiO₂ 20-30％、MgO 6-10％、Al₂O₃ 3-5％、Fe3O4 5-8％、FeO 1-2％、Fe₂O₃ 1-2％、MnO 0.5-1％、TiO₂0.5-1% and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: al (Al)₂O₃35-40% of Al, 15-30% of SiO₂5-15% of MgO, 5-15% of TiO₂5-10% of content, 1-5% of content of Fe-containing oxide and 2-6% of content of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 1.5-4Kg per ton of steel.

6. The steelmaking accelerant of claim 1, wherein the steelmaking accelerant comprises the following chemical compositions in percentage by mass: al with particle size of 1.1-1.5mm₂O₃42 percent of Al powder with the granularity of 1.0-1.5mm, 8 percent of Mn powder with the granularity of 1.0-2.0mm, 8 percent of Ca powder with the granularity of 1.0-2.0mm, 8 percent of CaO with the granularity of 1.0-2.0mm, 8 percent of Si powder with the granularity of 1.1-1.5mm, and 8 percent of SiO powder with the granularity of 1.1-1.5mm₂Less than 8 percent of TiO with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 0.01-0.015mm₂6.5 percent of Ba with the granularity of 1.1-1.5mm, 0.003 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P + S + O;

Al₂O₃、CaO、SiO₂、MgO、TiO₂the steel slag comprises the following components in percentage by mass: CaO 40-50%, SiO₂ 20-30％、MgO 6-10％、Al₂O₃ 3-5％、Fe3O4 5-8％、FeO 1-2％、Fe₂O₃ 1-2％、MnO 0.5-1％、TiO₂0.5-1% and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: al (Al)₂O₃35-40% of Al, 15-30% of SiO₂5-15% of MgO, 5-15% of TiO₂5-10% of content, 1-5% of content of Fe-containing oxide and 2-6% of content of CaO;

the addition amount of the steelmaking accelerant in steelmaking is 2.5Kg per ton of steel.

7. The steelmaking accelerant of claim 1, wherein the steelmaking accelerant comprises the following chemical compositions in percentage by mass: al with particle size of 1.1-1.5mm₂O₃47 percent of Al powder with the granularity of 1.0-1.5mm, 6.5 percent of Mn powder with the granularity of 1.0-2.0mm, 6.5 percent of Ca powder with the granularity of 1.0-2.0mm, 6.5 percent of CaO with the granularity of 1.0-2.0mm, 6.5 percent of Si powder with the granularity of 1.1-1.5mm and 1.1-1.5mm of SiO powder₂Less than 8 percent of TiO with the granularity of 1.1-1.5mm, less than 8 percent of MgO with the granularity of 0.01-0.015mm₂6.5 percent of Ba with the granularity of 1.1-1.5mm, 0.004 percent of rare earth with the granularity of 1.1-1.5mm, and less than or equal to 6 percent of Fe + C + N + P + S + O;

Al₂O₃、CaO、SiO₂、MgO、TiO₂the steel slag comprises the following components in percentage by mass: CaO 40-50%, SiO₂ 20-30％、MgO 6-10％、Al₂O₃ 3-5％、Fe3O4 5-8％、FeO 1-2％、Fe₂O₃ 1-2％、MnO 0.5-1％、TiO₂0.5-1% and less than or equal to 3% of other compounds;

the aluminum ash comprises the following components in percentage by mass: the aluminum ash comprises the following main components in percentage by weight: al (Al)₂O₃35-40% of Al, 15-30% of SiO₂5-15% of MgO, 5-15% of TiO₂5-10% of content, 1-5% of content of Fe-containing oxide and 2-6% of content of CaO;

the adding amount of the steelmaking accelerant in steelmaking is 2Kg per ton of steel.