CN114737022B - Environment-friendly smokeless molten steel refining agent and preparation method thereof - Google Patents
Environment-friendly smokeless molten steel refining agent and preparation method thereof Download PDFInfo
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- CN114737022B CN114737022B CN202210249298.4A CN202210249298A CN114737022B CN 114737022 B CN114737022 B CN 114737022B CN 202210249298 A CN202210249298 A CN 202210249298A CN 114737022 B CN114737022 B CN 114737022B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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Abstract
The invention belongs to the technical field of molten steel refining processes, and particularly relates to an environment-friendly smokeless molten steel refining agent and a preparation method thereof. The raw materials of the environment-friendly smokeless molten steel refining agent contain a component A and a component B; the component A comprises carbon, and accounts for 10-30% of the mass of the refining agent; the component B accounts for 70-90% of the refining agent; the component B contains metallic aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide; the component B comprises 10-30% of metallic aluminum, 0.1-4% of silicon dioxide, 20-40% of calcium oxide, 5-15% of aluminum oxide, 1-5% of calcium carbonate and 5-12% of magnesium oxide, wherein the mass of the component B is 100%. The environment-friendly smokeless molten steel refining agent has the characteristics of no dust, no smoke, safety and environment friendliness while considering high aluminum content.
Description
Technical Field
The invention belongs to the technical field of molten steel refining processes, and particularly relates to an environment-friendly smokeless molten steel refining agent and a preparation method thereof.
Background
In recent years, with the continuous improvement of the production technology and equipment level of the steel industry in China, some super-large steel enterprises reach the advanced level in the world, thereby driving the further optimization of variety structures; most of the existing steel mills adopt various auxiliary materials to deal with the problems, such as various refining agents, purifying agents, deoxidizing agents, composite deoxidizing agents, alloys, top slag modifiers, desulfurizing agents, slagging agents, slag adjusting agents, submerged arc agents, refining slag, ladle modifiers and the like, which are not exhaustive. Although they achieve a good effect in the pre-deoxidation of oxidic molten steel, there are still problems that prevail: 1. the deoxidation and desulfurization capacities are insufficient, the deoxidation capacity of steel smelting products with higher requirements on the deoxidation capacity is obviously insufficient, and the desulfurization capacity is natural and also not strong. 2. The slagging speed is slow, the temperature drop of the molten steel is large, the refining time is long, the purity of the finished molten steel is poor, the yield improvement of Al and alloy is limited, and the method cannot be used in the links with higher smelting requirements, including a vacuum furnace. 3. High content of impurities and harmful substances, and the raw materials are AD powder, si-Fe slag and common CaO. 4. Easy pulverization, low yield especially in a high-level stock bin, and influenced efficacy; in addition, a chemical reaction rapidly occurs upon contact with high-temperature molten steel and a large amount of smoke is generated in a short time, making it difficult to observe, affecting stokehold operation. 5. The reduction of the smelting cost is limited. 6. The effect of reducing the amount of fluorite used is not very obvious. 7. The optimization of the process cannot be effectively solved.
At present, the refining deoxidation process generally adopts metal Al for diffusion deoxidation. The Al2O3 product deoxidized by the composite alloy containing the metallic aluminum and the aluminum belongs to high-melting-point flocculent inclusions in the molten steel, has great influence on the steel quality, and simultaneously, the castability of the molten steel is deteriorated to influence the continuous casting production. In the production of steel grades mainly comprising metallic aluminum or aluminum-containing composite alloys by final deoxidation, if the above problems are not solved, the molten steel must be denatured by a calcium feeding wire or by an alloy such as CaSi, caAl, or casasi at a molten steel refining station, thereby significantly increasing the production cost. Although deoxidation efficiency is high in deoxidation efficiency by using metallic aluminum, it is often accompanied by generation of dense smoke and is not favorable for environmental and safe production.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a molten steel refining agent which has high aluminum content, no dust, no smoke, safety and environmental protection and a preparation method thereof.
In one aspect, the present invention provides an environmentally friendly smokeless molten steel refining agent comprising component a and component B.
The component A contains carbon, and the using amount of the component A is 10-40% of the mass of the refining agent; preferably 12-35%, 15-30%, 18-27%, 20-25%.
Further, the carbon is in the form of powder or granules, preferably carbon granules.
Further, the particle size of the carbon particles can be selected from 10 to 100 mm, preferably 15 to 80 mm, 18 to 60 mm, 20 to 50 mm and 25 to 40 mm.
The amount of the component B is 60-90% of the mass of the refining agent; preferably 65-90%, 70-90%, 75-88%, 75-85%. The component B is subjected to crushing treatment, preferably the component B is granules, and the particle size of the granules is preferably 10-100 mm, preferably 15-80 mm, 18-60 mm, 20-50 mm and 25-40 mm.
Further, the B component contains a high content of metallic aluminum. Al is a reactive metal, has strong deoxidizing capacity, can quickly deoxidize and is beneficial to quickly reaching the balance of oxygen transmission; al is oxidized by oxygen in the air, and the utilization efficiency is low, so that the use cost is high. The Al deoxidation product is Al2O3.Al can remove oxygen, reduce the oxidability and further reduce the secondary oxidation of molten steel brought by the post-process treatment process. The amount of Al affects the reaction rate, the smoke generation condition, the amount of top slag, the slag turning, the temperature drop of molten steel, and the like. The content of the aluminum accounts for 10-30% of the mass ratio of the component B; preferably 12-28%, 14-27%, 15-25%.
Further, the component B also contains silicon dioxide. SiO 2 2 Has partial slagging function, is easy to be reduced by Al, reduces the Al efficiency, can also influence the alkalinity of top slag, and can also influence other effective components. Wherein, the content of the silicon dioxide accounts for 0.1 to 4 percent of the mass ratio of the component B; preferably 0.5-3.5%, 0.5-3%, 1-3%, 1.5-2.5%.
Further, the component B also contains calcium oxide; wherein, the content of calcium oxide accounts for 20-40% of the mass ratio of the component B; preferably 22-38%, 25-35%, 25-30%, 26-29%.
Further, the component B also contains alumina. Wherein, the alumina can change the fluidity of the molten slag, control the material proportion of the top slag of the steel ladle and absorb the impurities; has great influence on the melting point of the modifier. The content of the alumina accounts for 5 to 15 percent of the mass ratio of the component B; preferably 6-13%, 7-11%, 7.5-10.5% and 8-10%.
Further, the component B also contains calcium carbonate; wherein, the content of calcium carbonate accounts for 0.5 to 5 percent of the mass ratio of the component B; preferably 1.5-4.5%, 2-4%, 2.5-3.5%.
Further, the component B also contains magnesium oxide; wherein, the content of the magnesium oxide accounts for 5 to 12 percent of the mass ratio of the component B; preferably 6-11%, 7-10%, 7.5-9.5% and 8-10%.
The component B of the refining agent may further contain inevitable impurity components such as S and P.
Further, the refining agent contains a component A and a component B, wherein the component A comprises carbon powder which accounts for 10-30% of the mass of the refining agent; the component B accounts for 70-90% of the refining agent; the component B contains metallic aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide; wherein the component B comprises 10-30% of metallic aluminum, 0.1-4% of silicon dioxide, 20-40% of calcium oxide, 5-15% of aluminum oxide, 1-5% of calcium carbonate and 5-12% of magnesium oxide, wherein the mass of the component B is 100%.
In another aspect, the present invention provides a method for preparing an environment-friendly smokeless molten steel refining agent, comprising:
1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 10-100 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 10-100 mm to obtain a component B for later use; (ii) a
3) And uniformly stirring and mixing the component A and the component B according to the dosage to obtain the environment-friendly smokeless molten steel refining agent.
Further, the stirring speed of the steps 1), 2) and 3) is 10-100 revolutions/minute, preferably 50-200 revolutions/minute; the stirring time is 0.1-1h, preferably 0.2-0.5h.
Further, the particle size of the carbon particles is preferably 15 to 80 mm, 18 to 60 mm, 20 to 50 mm, 25 to 40 mm, 30 to 35 mm.
Further, the particle diameter of the component B is preferably 15 to 80 mm, 18 to 60 mm, 20 to 50 mm, 25 to 40 mm, 30 to 35 mm.
Further, the mass ratio of the aluminum content to the component B is 10-30%; preferably 12-28%, 14-27%, 15-25%.
Further, the mass ratio of the silicon dioxide to the component B is 0.1-4%; preferably 0.5-3.5%, 0.5-3%, 1-3%, 1.5-2.5%.
Furthermore, the content of calcium oxide accounts for 20-40% of the mass ratio of the component B; preferably 22-38%, 25-35%, 25-30% and 26-29%.
Further, the mass ratio of the content of the alumina to the component B is 5-15%; preferably 6-13%, 7-11%, 7.5-10.5% and 8-10%.
Furthermore, the content of calcium carbonate accounts for 0.5 to 5 percent of the mass ratio of the component B; preferably 1.5-4.5%, 2-4%, 2.5-3.5%.
Furthermore, the content of the magnesium oxide accounts for 5-12% of the mass ratio of the component B; preferably 6-11%, 7-10%, 7.5-9.5% and 8-10%.
Further, component B may contain inevitable impurity components such as S and P.
Further, the component A accounts for 10-30% of the mass of the refining agent; the component B accounts for 70-90% of the refining agent; the component B comprises 10-30% of metallic aluminum, 0.1-4% of silicon dioxide, 20-40% of calcium oxide, 5-15% of aluminum oxide, 1-5% of calcium carbonate and 5-12% of magnesium oxide, wherein the mass of the component B is 100%.
Has the advantages that:
the refining agent obtained by the invention can control the content of FeO in the top slag within a lower range, and has wide application prospect. The invention controls proper A and B components and content, and selects proper A component grain diameter, the obtained refining agent has excellent refining effect, and the content of FeO can be reduced in a larger range, thereby improving the use efficiency of steel raw materials.
The refining agent has a good smoking scoring effect, the scoring is between 0.1 and 0.2, the smoking condition of the refining agent is weak, and the refining agent has an environment-friendly effect. The invention uses the combination of the component A and the component B, so that the smoking condition of the invention is obviously improved. The fume emission of the refining agent of the present invention can be further reduced by adjusting the particle size of the carbon particles and selecting an appropriate particle size range of 25-40 mm.
Detailed Description
The present invention will be specifically explained below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly presented thereby. It will be understood by those skilled in the art that these specific embodiments and examples are illustrative of the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
Example 1:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials in parts by weight: component A: carbon powder; 10 parts of (A); and (B) component: 90 parts of a mixture; the component B contains 14 parts of metallic aluminum, 4 parts of silicon dioxide, 40 parts of calcium oxide, 15 parts of aluminum oxide, 5 parts of calcium carbonate and 12 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 25-40 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the using amount to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
Example 2:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials (by weight portion): and (2) component A: carbon powder; 30 parts of (1); and (B) component: 90 parts of a mixture; the component B contains 25 parts of metallic aluminum, 2 parts of silicon dioxide, 35 parts of calcium oxide, 155 parts of aluminum oxide, 3 parts of calcium carbonate and 10 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 25-40 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the dosage to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
Example 3:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials in parts by weight: component A: carbon powder; 22.5 parts; and (B) component: 90 parts of a mixture; the component B contains 15 parts of metallic aluminum, 3 parts of silicon dioxide, 40 parts of calcium oxide, 15 parts of aluminum oxide, 5 parts of calcium carbonate and 12 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 25-40 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the using amount to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
Example 4:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials (by weight portion): and (2) component A: carbon powder; 30 parts of (1); and (B) component: 90 parts of; the component B contains 22 parts of metallic aluminum, 4 parts of silicon dioxide, 34 parts of calcium oxide, 13 parts of aluminum oxide, 5 parts of calcium carbonate and 12 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 25-40 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the using amount to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
Comparative example 1:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials (by weight portion): and (2) component A: carbon powder; 120 parts of (A);
the preparation method comprises the following steps: crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 25-40 mm to obtain a component A to obtain an environment-friendly smokeless molten steel refining agent;
the stirring rate was 100 revolutions per minute and the stirring time was 0.3h.
Comparative example 2:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials in parts by weight: and (B) component: 120 parts of (A); the component B contains 20 parts of metallic aluminum, 4 parts of silicon dioxide, 53.33 parts of calcium oxide, 20 parts of aluminum oxide, 6.67 parts of calcium carbonate and 16 parts of magnesium oxide;
the preparation method comprises the following steps: stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide uniformly according to the dosage, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component to obtain the environment-friendly smokeless molten steel refining agent;
the stirring rate was 100 revolutions per minute and the stirring time was 0.3h.
Comparative example 3:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials in parts by weight: component A: carbon powder; 36 parts of (A); and (B) component: 108 parts of (1); the component B contains 40 parts of metallic aluminum, 4 parts of silicon dioxide, 34 parts of calcium oxide, 13 parts of aluminum oxide, 5 parts of calcium carbonate and 12 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 25-40 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the using amount to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
Comparative example 4:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials in parts by weight: and (2) component A: carbon powder; 23 parts; and (B) component: 69 parts of a binder; the component B contains 1 part of metallic aluminum, 4 parts of silicon dioxide, 34 parts of calcium oxide, 13 parts of aluminum oxide, 5 parts of calcium carbonate and 12 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 25-40 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the dosage to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
Comparative example 5:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials (by weight portion): and (2) component A: carbon powder; 30 parts of (1); and (B) component: 90 parts of; the component B contains 22 parts of metallic aluminum, 4 parts of silicon dioxide, 34 parts of calcium oxide, 13 parts of aluminum oxide, 5 parts of calcium carbonate and 12 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 1-5 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the dosage to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
Comparative example 6:
an environment-friendly smokeless molten steel refining agent comprises the following raw materials in parts by weight: and (2) component A: carbon powder; 30 parts of a binder; and (B) component: 90 parts of; the component B contains 22 parts of metallic aluminum, 4 parts of silicon dioxide, 34 parts of calcium oxide, 13 parts of aluminum oxide, 5 parts of calcium carbonate and 12 parts of magnesium oxide;
the preparation method comprises the following steps: 1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with the particle size range of 100-120 mm to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a mixture with the particle size range of 25-40 mm to obtain a component B for later use;
3) Uniformly stirring and mixing the component A and the component B according to the dosage to obtain the environment-friendly smokeless molten steel refining agent;
the stirring speed of the steps 1), 2) and 3) is 100 revolutions per minute, and the stirring time is 0.3h.
When the refining agent is used, the refining agent is put on the surface of molten steel, the added refining agent is fused with slag, the molten steel is melted under the action of high temperature, the slag surface is stirred to promote the molten steel refining agent to be melted and spread, the molten steel refining agent is rapidly combined with slag to form a target slag system, harmful impurities in the steel are adsorbed, the purposes of deoxidation and impurity removal in the slag are achieved, and the production process requirements of high-end steel are met.
And (4) performance testing: the refining agent is added into 2.0kg of molten steel per ton, and the ladle top slag is taken for detection.
And (3) detecting a slag sample, wherein the slag sample comprises the following components in percentage by mass:
| % | example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 |
| FeO | 5.53 | 5.07 | 5.40 | 4.92 | 15.8 | 6.89 | 8.57 | 12.92 | 5.94 | 5.80 |
The content of FeO in the top slag refined by the refining agent of the embodiment and the comparative example is greatly reduced, and the refining agent obtained by the invention can control the content of FeO in the top slag in a lower range, thereby having wide application prospect. The invention controls proper A and B components and content, and selects proper A component grain diameter, the obtained refining agent has excellent refining effect, and the content of FeO can be reduced in a larger range, thereby improving the use efficiency of steel.
Smoking scoring: the refining agent is put on the surface of molten steel, the added refining agent is fused with slag, the smoking condition and duration are recorded, and the smoking effect is evaluated correspondingly.
The specific evaluation criteria were: smoking for more than 2min, and scoring as 1; smoking for 1.5-2min, and scoring 0.8; smoking for 1-1.5min, and scoring 0.8; smoking for 0.5-1min, and scoring for 0.4; smoking for 0.2-0.5min, and scoring for 0.2; smoking for 0-0.2min with index of 0; smoking for more than 2min, and scoring for 0.5; smoking for 1.5-2min, and scoring 0.4; smoking for 1-1.5min, and scoring for 0.3; smoking for 0.5-1min, and scoring as 0.2; smoking for 0.2-0.5min, and scoring as 0.1; smoking a thin cigarette for 0-0.2min, and scoring 0.
| % | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 |
| Smoking score | 0.1 | 0.2 | 0.1 | 0.1 | 0 | 0.4 | 0.8 | 0 | 0.3 | 0.3 |
The table analysis shows that the embodiment 1-4 of the invention has better smoke scoring technical effect, the score is between 0.1-0.2, the smoke condition of the refining agent is weak, and the refining agent has the effects of environmental protection and the like. As can be seen from comparison of comparative example 2 and inventive example 4, the use of the combination of components A and B according to the present invention results in a significant improvement in smoking. Further, the present invention adjusts the particle size of the carbon particles and selects a suitable particle size range of 25-40 mm to further reduce the smoke emission of the refining agent of the present invention.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. An environment-friendly smokeless molten steel refining agent is characterized in that: the raw material contains a component A and a component B;
wherein the component A is carbon, and accounts for 10-30% of the mass of the refining agent;
the component B accounts for 70-90% of the refining agent;
the component B contains metallic aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide;
wherein, the component B comprises 10 to 30 percent of metallic aluminum, 0.1 to 4 percent of silicon dioxide, 20 to 40 percent of calcium oxide, 5 to 15 percent of aluminum oxide, 1 to 5 percent of calcium carbonate and 5 to 12 percent of magnesium oxide, wherein the mass of the component B is 100 percent;
the carbon is granular, and the particle size of the carbon granules is 15-80 mm;
the component B is subjected to crushing treatment, and the component B is particles with the particle size of 10-100 mm.
2. An environment-friendly smokeless molten steel refining agent according to claim 1, characterized in that: the particle size of the carbon particles is 18-60 mm.
3. An environment-friendly smokeless molten steel refining agent according to claim 1, characterized in that: the component A accounts for 15-30%.
4. An environment-friendly smokeless molten steel refining agent according to claim 1, characterized in that: the dosage of the component B is 75-88% of the mass of the refining agent.
5. An environment-friendly smokeless molten steel refining agent according to claim 1, characterized in that: the dosage of the component B is 75-85% of the mass of the refining agent.
6. An environment-friendly smokeless molten steel refining agent according to claim 1, characterized in that: the particle size of the component B particles is 15-80 mm.
7. A method of making the environmentally friendly smokeless molten steel refining agent of any one of claims 1-6, comprising:
1) Crushing carbon to obtain carbon powder, sieving and selecting the carbon powder with a certain particle size range to obtain a component A for later use;
2) Uniformly stirring and mixing metal aluminum, silicon dioxide, calcium oxide, aluminum oxide, calcium carbonate and magnesium oxide according to the using amount, then crushing, sieving and selecting a certain particle size range to obtain a component B for later use;
3) And uniformly stirring and mixing the component A and the component B according to the using amount to obtain the environment-friendly smokeless molten steel refining agent.
8. The method for preparing the environment-friendly smokeless molten steel refining agent according to claim 7, wherein the stirring rates of the steps 1), 2) and 3) are 10-100 rpm.
9. The method for preparing the environment-friendly smokeless molten steel refining agent according to claim 7, wherein the stirring time of the steps 1), 2) and 3) is 0.1-1h.
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