High-silicon molten iron smelting method

A smelting method and molten iron technology, applied in the manufacture of converters, etc., can solve problems such as difficult to control process splashing, large consumption of steel materials, and high silicon content in molten iron, so as to reduce production costs and equipment maintenance costs, increase output, Realize the effect of recycling

Active Publication Date: 2013-04-24
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the large amount of iron produced by the large blast furnace, the silicon content of the molten iron is high, and the viscosity of the molten iron is high, which brings a certain pressure on the casting pig iron; It is difficult to control the splashing process, resulting in a large consumption of steel materials. In severe cases, the splashing products will burn out the equipment and emit yellow smoke to pollute the environment, making it difficult to carry out production

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  • High-silicon molten iron smelting method

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Embodiment Construction

[0036] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0037] The method for smelting high-silicon molten iron disclosed by the invention comprises the following steps:

[0038] a. Top-bottom compound smelting is adopted, and the weight percentage of the raw material composition of the metal main material is 75-85% of high-silicon molten iron, and the balance is light steel scrap;

[0039] b. Oxygen control in the early stage of smelting: the oxygen supply intensity of the first 1 / 15 of the oxygen after blowing is 3.7-4.3Nm 3 / t min; Oxygen supply intensity during slag removal period is 3.0-3.4 Nm 3 / t min; the oxygen supply intensity at the end of blowing is 3.2-3.6 Nm 3 / t min;

[0040] C, after blowing down gun in s...

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Abstract

The invention discloses a high-silicon molten iron smelting method. The method comprises earlier-stage oxygen blast control, regulation and control of slagging material composition and alkalinity and deslagging stability, earlier-stage deslagging control, later-stage deslagging control and other regulation and control means, thereby implementing desilication smelting of high-silicon molten iron. By using high-silicon molten iron and light scrap steel as raw materials, the method disclosed by the invention controls the oxygen blast quantity in different stages to control the smelting slagging rhythm and effectively lower the silicon content of the smelted molten iron, thereby enhancing the smelting effect and smelting quality of the molten iron.

Description

[0001] technical field [0002] The invention relates to a method for smelting iron and steel, in particular to a method for smelting high-silicon molten iron. Background technique [0003] When large-scale blast furnaces are turned on or shut down, the molten iron produced has a particularly high silicon content, generally above 2.0%, and up to 4.3%. [0004] Due to the large amount of iron produced by the large blast furnace, the silicon content of the molten iron is high, and the viscosity of the molten iron is high, which brings a certain pressure on the casting pig iron; It is difficult to control the splashing process, resulting in a large consumption of steel materials. In severe cases, the splashing products will burn out the equipment and pollute the environment with yellow smoke, making it difficult to carry out production. [0005] Contents of the invention [0006] In order to solve the above problems, the present invention discloses a method for smelting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30C21C5/36
Inventor 唐洪乐虞大俊吴康洪建国
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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