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Molten iron desilication method for stainless steel smelting

A stainless steel and desiliconization technology, applied in the manufacture of converters, etc., can solve the problems of high tapping temperature, limited desiliconization capacity, and large temperature drop of molten iron in blast furnaces, so as to prevent splashing, improve labor productivity, and reduce investment costs. Effect

Active Publication Date: 2014-03-05
BERIS ENG & RES CORP
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Problems solved by technology

Combined with the characteristics of high content of nickel-containing molten iron [Si] and [Ni], the melting point of nickel is high. High nickel content leads to high tapping temperature of blast furnace. Limited desiliconization capacity; desiliconization in molten iron tanks is prone to splashing

Method used

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  • Molten iron desilication method for stainless steel smelting
  • Molten iron desilication method for stainless steel smelting
  • Molten iron desilication method for stainless steel smelting

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Embodiment Construction

[0028] In order to better understand the object of the present invention, the method for desiliconization of molten iron for stainless steel smelting according to the present invention will be described in detail below in combination with the background of the present invention, flow chart and actual working conditions.

[0029] 1. Introduce the main equipment used in the molten iron desiliconization process for stainless steel smelting:

[0030] Two 318m 3 Ironmaking blast furnace: used to melt the nickel-containing sinter formed by laterite nickel ore, flux, and coke powder into nickel-containing high-silicon molten iron;

[0031] Two 40t intermediate frequency furnaces: used to melt scrap steel and alloys;

[0032] A 110t desiliconization converter 1: used for desiliconization, decarburization, dephosphorization and desulfurization to obtain stainless steel

[0033] semi-steel;

[0034] A 120tAOD converter 7: The final smelting of stainless steel.

[0035] 2. The specif...

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Abstract

The invention provides a molten iron desilication method for stainless steel smelting, which comprises the following steps: 1. blast furnace molten iron preparation: mixing and sintering laterite-nickel ore, adding the laterite-nickel ore into a blast furnace, and smelting while ensuring the blast furnace tapping temperature to be at least 1350 DEG C; 2. transportation: transporting the high-temperature nickeliferous high-silicon molten iron of the blast furnace to a desilication converter in the one-step or metal mixer form; 3. carrying out desilication, decarburization, dephosphorization and desulfurization on the nickeliferous high-silicon molten iron in the desilication converter, and carrying out desilication treatment on the molten iron in a top / bottom blowing mode, wherein the mass percent of silicon in the desilicated molten iron is not greater than 0.20%; and 4. final product smelting: after finishing converting, charging the semisteel from the desilication converter into an AOD (argon oxygen decarburization) furnace while adding alloy into the AOD furnace, and finishing the final smelting of stainless steel. The desilication technique has low requirements for Si content in the molten iron, provides sufficient reaction space for desilication, effectively prevents splashing, creates favorable dynamic conditions for desilication, and meanwhile, can perform dephosphorization and desulfurization.

Description

technical field [0001] The invention relates to a method for desiliconizing molten iron for stainless steel smelting, in particular to nickel-containing and high-silicon molten iron produced by treating laterite nickel ore. Background technique [0002] With the rapid development of the stainless steel industry, the demand for metal nickel continues to increase. However, nickel sulfide ore resources are increasingly scarce, making laterite nickel ore the main source of nickel supply in the future. Laterite nickel ore accounts for 72.2% of the world's land-based nickel resources, but the nickel it produces only accounts for 42% of the world's nickel production. Using laterite nickel ore to produce nickel iron water provides a cheap nickel source for the rapidly developing stainless steel industry. It is the use of laterite nickel ore efficient access to resources. The content of silicon in blast furnace ferronickel water produced from laterite nickel ore is very high, some a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C5/35C21C7/04C21C7/064
Inventor 石红勇樊君冀中年陈圣鹏
Owner BERIS ENG & RES CORP
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