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Molten iron dephosphorizing agent, refining agent, and dephosphorization method

A dephosphorization agent and refining agent technology, applied in the direction of improving process efficiency, manufacturing converters, etc., can solve problems such as limited reuse of slag

Inactive Publication Date: 2018-03-27
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the dregs of CaO, fluorite (CaF 2 ) is effective, but when fluorite is used, the slag generated by the slag of CaO contains fluorine, so the reuse method of slag is greatly limited, etc.

Method used

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  • Molten iron dephosphorizing agent, refining agent, and dephosphorization method
  • Molten iron dephosphorizing agent, refining agent, and dephosphorization method

Examples

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Embodiment

[0067] The dephosphorization treatment using the converter was performed using various calcium ferrites shown in Table 1. For the conditions of dephosphorization treatment, [P] before dephosphorization is 0.1%, the injection time is 3-4 minutes, the loading alkalinity is 1.8, and the calcium ferrite usage is 10kg / t. The finished product [P] in the table is [P] in the slab stage. In addition, the state of splashing from the converter mouth during the dephosphorization spraying was investigated, and the case where the spraying was interrupted in the middle due to the spattering was regarded as "present", and the case where it was not interrupted was regarded as "absence". In addition, the input timing means the timing of injecting calcium ferrite into the converter, and it is set as "before charging molten iron" or "after charging molten iron".

[0068] [Table 1]

[0069]

[0070] It can be seen that No.1 to No.9 as examples of the present invention have achieved finished p...

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Abstract

A molten iron dephosphorizing agent containing 2-20 mass% Al2O3, the balance being calcium ferrite and impurities and the (Al2O3 mass%) / (CaO mass%) ratio being 0.04-0.5. Dephosphorization of molten iron is performed by adding a refining agent comprising said dephosphorizing agent into a converter furnace.

Description

technical field [0001] The present invention relates to a method for dephosphorizing hot metal using a combined top-bottom blowing converter, and relates to a method for hot metal that can efficiently smelt low-phosphorus steel even in a refining process with a short blowing time Dephosphorization agent, refining agent and dephosphorization method. Background technique [0002] In recent years, the demand for steel materials has become higher, and the demand for low phosphorus steel has increased. At present, the dephosphorization treatment of molten iron is generally performed by a method of performing treatment under low temperature conditions in a thermodynamically favorable molten iron stage. As a device for dephosphorizing molten iron, the top-bottom combined blowing converter is suitable. This is because gaseous oxygen, which is an oxidizing agent necessary for dephosphorization and has less heat loss than solid oxidation sources, can be blown from a top-blown lance ...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C5/36
CPCC21C1/02C21C5/36Y02P10/20C21C1/025C21C7/0645
Inventor 柿本昌平野崎祐志权田義明清濑明人古河直树
Owner NIPPON STEEL CORP
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