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Fluoride-free spherical slag for molten iron desulfurization and preparation method

A molten iron desulfurization, spherical technology, applied in the field of molten iron desulfurization, can solve the problems of failure to popularize, rare metals are expensive, easy to oxidize, etc., and achieve the effect of improving desulfurization efficiency, good desulfurization effect, and low cost

Inactive Publication Date: 2021-09-17
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of iron and steel smelting, it has been reported that using rare earth metals to desulfurize molten iron or molten steel has a good desulfurization effect, but due to the relatively expensive and easy oxidation of rare metals, this technology has not been popularized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing spherical slag for desulfurization of fluorine-free molten iron, comprising the following steps:

[0032] (1) Melt the aluminum slag in the graphite crucible of the induction furnace, the melting temperature is 850°C, the main components of the aluminum slag are: Al: 46.2%, Al 2 o 3 : 33.5%, SiO 2 : 10.2%, MgO: 7.5%, CaO: 2.4%, and the rest are impurities.

[0033] (2) Place the graphite crucible with molten aluminum slag in a spiral electromagnetic stirrer, turn on the stirrer, and then add rare earth cerium oxide powder into the molten aluminum slag and stir until uniform. The mass ratio of rare earth cerium oxide to aluminum slag is 1:10. The spiral electromagnetic stirring current is 250A and the frequency is 30Hz.

[0034] (3) After cooling the homogeneously stirred mixture of rare earth cerium oxide and aluminum slag, prepare a spherical core of a desulfurizing agent with a particle size of 1-3 mm on a pulverizer and a spheroidizer.

[...

Embodiment 2

[0038] A method for preparing spherical slag for desulfurization of fluorine-free molten iron, comprising the following steps:

[0039] (1) Melt the aluminum slag in the graphite crucible of the induction furnace, the melting temperature is 870°C, the weight percentage of the composition of the aluminum slag is: Al: 46.2%, Al 2 o 3 : 33.5%, SiO 2 : 10.2%, MgO: 7.5%, CaO: 2.4%, and other impurities.

[0040] (2) Place the graphite crucible with molten aluminum slag in a spiral electromagnetic stirrer, turn on the stirrer, and then add rare earth cerium oxide powder into the molten aluminum slag and stir until uniform. The mass ratio of rare earth cerium oxide to aluminum slag is 3:25. The spiral electromagnetic stirring current is 270A and the frequency is 40Hz.

[0041] (3) After cooling the homogeneously stirred mixture of rare earth cerium oxide and aluminum slag, prepare a spherical core of a desulfurizing agent with a particle size of 1-3 mm on a pulverizer and a spher...

Embodiment 3

[0045] A method for preparing spherical slag for desulfurization of fluorine-free molten iron, comprising the following steps:

[0046] (1) Melt the aluminum slag in the graphite crucible of the induction furnace, the melting temperature is 870°C, the weight percentage of the composition of the aluminum slag is: Al: 46.2%, Al 2 o 3 : 33.5%, SiO 2 : 10.2%, MgO: 7.5%, CaO: 2.4%, and other impurities.

[0047] (2) Place the graphite crucible with molten aluminum slag in a spiral electromagnetic stirrer, turn on the stirrer, and then add rare earth cerium oxide powder into the molten aluminum slag and stir until uniform. The mass ratio of rare earth cerium oxide to aluminum slag is 3:20. The spiral electromagnetic stirring current is 300A, and the frequency is 50Hz.

[0048] (3) After cooling the homogeneously stirred mixture of rare earth cerium oxide and aluminum slag, prepare a spherical core of a desulfurizing agent with a particle size of 1-3 mm on a pulverizer and a sphe...

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Abstract

The invention relates to fluoride-free spherical slag for molten iron desulfurization and a preparation method, the spherical slag is composed of a ball core and a layer of lime covering the ball core, and the ball core is prepared from aluminum slag and rare earth oxide. The fluoride-free spherical slag for molten iron desulfurization and the preparation method have the advantages that industrial waste aluminum slag and rare earth slag are utilized, the preparation cost is reduced, meanwhile, the good desulfurization effect is achieved, a fluxing agent calcium fluoride commonly used for molten iron desulfurization at present is replaced, and furnace lining erosion and environment pollution are avoided. By means of the melting temperature range of the aluminum slag, the rare earth oxide powder can be dispersed and distributed in the molten aluminum slag, and burning loss of aluminum in the aluminum slag can be avoided.

Description

technical field [0001] The invention belongs to the field of molten iron desulfurization, and in particular relates to a fluorine-free spherical slag for desulfurization of molten iron used for deep desulfurization and a preparation method thereof. Background technique [0002] The KR mechanical stirring method has gradually become an important technical means used by advanced steel mills at home and abroad to produce high-quality steel due to its superior kinetic conditions and the ability to use cheap lime as a desulfurizer for deep desulfurization and ultra-deep desulfurization. At present, it is still a common treatment method for steel mills to add fluorite to lime as a catalyst, because the main component of fluorite is CaF 2 It can be combined with CaO to form a low-melting eutectic melt to promote the desulfurization reaction, while CaF 2 It will corrode the furnace lining, pollute the environment and be harmful to human health, so it is very important to develop a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02C22B1/244C22B1/00
CPCC21C7/0645C21C1/025C22B1/2406C22B1/244C22B1/005
Inventor 康磊尚德礼康伟吕春风赵成林郭庆涛杨光唐雪峰董刚
Owner ANGANG STEEL CO LTD
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