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A method and device for external desulfurization and refining of molten iron by injecting magnesium steam

A magnesium steam and molten iron furnace technology, applied in the field of metallurgy, can solve the problems of low magnesium utilization efficiency and large safety hazards, and achieve the effects of reduced desulfurization cost, high utilization rate, and enhanced controllability

Active Publication Date: 2016-06-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art such as large potential safety hazards and low utilization efficiency of magnesium by injecting granular magnesium desulfurization, the present invention provides a method and device for external desulfurization and refining of molten iron by injecting magnesium steam. High-temperature magnesium steam is generated externally, and then injected into molten iron under the carrying of high-temperature inert carrier gas for desulfurization and refining. It has the advantages of high utilization rate of magnesium steam, low desulfurization cost, high desulfurization efficiency and strong safety.

Method used

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  • A method and device for external desulfurization and refining of molten iron by injecting magnesium steam

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Effect test

Embodiment 1

[0041] The method for desulfurization and refining outside the molten iron furnace by injecting magnesium steam of the present embodiment is carried out according to the following steps:

[0042] (1) Preparation of high temperature magnesium steam:

[0043] Calcined dolomite at 900°C for 240min to obtain calcined dolomite with an activity greater than 35%, dried the reducing agent and accelerator in a drying oven at 120°C for 20h, then ground to -100 mesh, and then reduced calcined dolomite and 75SiFe agent, CaF 2 Accelerator, according to calcined dolomite:75SiFe:CaF2 =4:38:5 mass ratio mixed evenly, pressed into pellets under a pressure of 50MPa, then put the prepared pellets into a high-temperature furnace outside the ladle, heated to 1300°C to generate high-temperature magnesium steam;

[0044] (2) High temperature magnesium steam transportation:

[0045] One end of the high-temperature furnace that generates high-temperature magnesium steam outside the ladle is airtight...

Embodiment 2

[0050] The method for desulfurization and refining outside the molten iron furnace by injecting magnesium steam of the present embodiment is carried out according to the following steps:

[0051] (1) Preparation of high temperature magnesium steam:

[0052] Dolomite was calcined at 1300°C for 60 minutes to obtain calcined dolomite with an activity greater than 35%, and the reducing agent and accelerator were dried at 200°C in a drying oven for 4 hours, then ground to -100 mesh, and then the calcined dolomite and Al were reduced agent, CaF 2 Accelerator, as calcined dolomite: Al: CaF 2 =20:20:10 mass ratio mixed evenly, pressed into pellets under a pressure of 60MPa, then put the prepared pellets into a high-temperature furnace outside the ladle, heated to 1200°C to generate high-temperature magnesium steam;

[0053] (2) High temperature magnesium steam transportation:

[0054] One end of the high-temperature furnace that generates high-temperature magnesium steam outside th...

Embodiment 3

[0059] The method for desulfurization and refining outside the molten iron furnace by injecting magnesium steam of the present invention is carried out according to the following steps:

[0060] (1) Preparation of high temperature magnesium steam:

[0061] Calcined dolomite at 1000°C for 100min to obtain calcined dolomite with an activity greater than 35%, dried the reducing agent and accelerator in a drying oven at 180°C for 12h, then ground to -100 mesh, and then reduced the calcined dolomite and AlSi agent, CaF 2 Accelerator, as calcined dolomite:AlSi:CaF 2 =50:11:1 mass ratio, mixed evenly, pressed into pellets under the pressure of 20MPa, then put the prepared pellets into the high-temperature furnace outside the ladle, heated to 1400°C to generate high-temperature magnesium steam;

[0062] (2) High temperature magnesium steam transportation:

[0063] One end of the high-temperature furnace that generates high-temperature magnesium steam outside the ladle is airtightly...

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Abstract

The invention belongs to the field of metallurgical technology, and particularly relates to a method and device for desulfurization and refining outside a molten iron furnace by injecting magnesium steam. The technical solution of the present invention is to place the magnesium source that generates magnesium vapor in a high-temperature furnace outside the molten iron ladle, and heat it under the protection of inert gas to generate high-temperature magnesium vapor. One end of the high-temperature furnace that generates high-temperature magnesium vapor is sealed and connected to the spray gun through a high-temperature transportation pipe. , the spray gun is inserted into the molten pool of the molten iron ladle, and the other end is sealed with a flange. An air inlet pipe is installed on the flange. The inert carrier gas is passed from the air inlet pipe into the high-temperature furnace to generate magnesium steam, and the generated high-temperature magnesium steam is carried away from the high-temperature furnace. , transported to the spray gun in the molten iron ladle through high-temperature transportation pipelines, blowing high-temperature magnesium steam into the high-temperature molten pool, and at the same time starting the eccentric mechanical stirring device in the molten iron ladle to perform the desulfurization reaction. The invention improves the desulfurization efficiency and the utilization rate of magnesium vapor. The utilization rate of desulfurization agent metal magnesium is greater than 90%, the desulfurization rate is greater than 95%, and the comprehensive desulfurization cost is reduced by more than 40%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method and device for external desulfurization and refining of molten iron by injecting magnesium steam. Background technique [0002] With the development of modern steelmaking technology, the converter steelmaking process has been decomposed into three stages: molten iron pretreatment, converter smelting and out-of-furnace refining. Various chemical reactions are carried out under the best conditions, which greatly improves production efficiency, reduces production costs, obtains purer quality steel, and meets the higher requirements of modern industry for steel quality. Adopting the desulfurization technology outside the molten iron furnace can greatly reduce the desulfurization burden of the blast furnace, and truly achieve high output and low consumption. With the development of science and technology, the requirements for steel quality are getting higher a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 张廷安刘燕豆志河王聪张子木赵秋月吕国志赫冀成傅大学
Owner NORTHEASTERN UNIV LIAONING