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High-calcium pre-molten slag modification aluminium slag ball and preparation method thereof

A technology for pre-melting slag and aluminum slag balls is applied in the field of high-calcium pre-melting slag modified aluminum slag balls and its preparation. Aluminum-calcium ratio, the effect of reducing oxygen content

Active Publication Date: 2014-04-09
西峡县恒基冶材有限公司
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AI Technical Summary

Problems solved by technology

Chinese patent CN1752221A discloses a "refining slag modified aluminum slag ball and its preparation method" which solves the above technical problems to a certain extent, but the product has the following problems: (1) The raw materials except aluminum are raw materials, which have not been prepared beforehand. Melting treatment, high impurity content, polluting molten steel, is not conducive to clean steel production, and the fluidity and heat preservation effect of slag are also affected; (2) The low CaO content (10-13%) and high aluminum-calcium ratio limit the slag Ability to adsorb inclusions in molten steel; (3) Contains F - , harmful to the environment and furnace lining
To improve the above patented technology, the Chinese patent ZL200510094824.0 discloses a "pre-melted refining slag modified aluminum slag ball and its preparation method", which is to pre-melt the raw material and make the ball with metal aluminum, but there is also CaO content Low (10-15%) and containing F - problem; and Chinese patent ZL200610097700.2 discloses a kind of "ladle slag modified aluminum slag ball" does not contain F - , but there are problems that the raw material used is raw meal and the content of CaO is low

Method used

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preparation example Construction

[0020] The preparation method of the above-mentioned high-calcium pre-melted slag modified aluminum slag ball is as follows:

[0021] 1) Preparation of pre-melted slag: The limestone powder, calcium oxide, bauxite powder, iron red and magnesia powder after sampling and analysis are qualified according to the weight ratio of 30~50:10~30:20~40:5~10:1 Weigh and mix at a ratio of ~3 to obtain a mixed material, then add 1 to 10% of the weight of the mixed material and pulp waste liquid with a concentration of 30% and stir evenly, press it into a spherical or block material, and then put it into Melt in the furnace, and after cooling out of the furnace, process according to the required particle size to obtain pre-melted slag;

[0022] 2) Preparation of high-calcium pre-melted slag modified aluminum slag balls: the metal aluminum with a weight percentage of 40-47 and the above-mentioned pre-melted slag with a weight percentage of 53-60 are weighed and mixed to obtain a mixture, and ...

Embodiment 1

[0024] A high-calcium pre-melted slag modified aluminum slag ball, which contains metal aluminum (Al), calcium oxide (CaO), aluminum oxide (Al 2 o 3 ), silicon dioxide (SiO 2 ), magnesium oxide (MgO), a small amount of water (H 2 O) and unavoidable other impurities, its component content by weight percentage is: metal aluminum 46, calcium oxide 30, aluminum oxide 14, silicon dioxide 5, magnesium oxide 4, moisture 0.26, other substances balance .

[0025] The specific technological process of the preparation method of the above-mentioned high-calcium pre-melted slag modified aluminum slag ball is as follows:

[0026] 1) Raw material sampling analysis and material preparation:

[0027] The content by weight percentage of the chemical composition of each raw material is respectively:

[0028] Metal aluminum: Al≥95%, Si≤4%;

[0029] Limestone powder: CaCO 3 ≥95%, SiO 2 ≤5%;

[0030] Calcium oxide: CaO≥97%, SiO 2 ≤2%;

[0031] Bauxite powder: Al 2 o 3 ≥80%, SiO 2 ≤15%...

Embodiment 2

[0048] A high-calcium pre-melted slag modified aluminum slag ball, which contains metal aluminum (Al), calcium oxide (CaO), aluminum oxide (Al 2 o 3 ), silicon dioxide (SiO 2 ), magnesium oxide (MgO), a small amount of water (H 2 O) and unavoidable other impurities, its component content by weight percentage is: metal aluminum 42, calcium oxide 33, aluminum oxide 15, silicon dioxide 4, magnesium oxide 5, moisture 0.3, and the balance of other substances .

[0049] The specific technological process of the preparation method of the above-mentioned high-calcium pre-melted slag modified aluminum slag ball is as follows:

[0050] 1) Raw material sampling analysis and material preparation:

[0051] The content by weight percentage of the chemical composition of each raw material is respectively:

[0052] Metal aluminum: Al≥95%, Si≤4%;

[0053] Limestone powder: CaCO 3 ≥95%, SiO 2 ≤5%;

[0054] Calcium oxide: CaO≥97%, SiO 2 ≤2%;

[0055] Bauxite powder: Al 2 o 3 ≥80%, S...

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Abstract

The invention relates to a high-calcium pre-molten slag modification aluminium slag ball and a preparation method thereof, wherein the high-calcium pre-molten slag modification alumina slag ball is used for covering the surface of molten steel for heat preservation and improving the properties of steel slag in refining treatment for smelting clean steel. The high-calcium pre-molten slag modification alumina slag ball contains metallic aluminium, calcium oxide, aluminium sesquioxide, silicon dioxide, magnesium oxide, a little water and other inevitable impurities, and is adapted to smelt the clean steel. During refining, such high-calcium pre-molten slag modification alumina slag balls are added and spread on the surface of the molten steel to achieve a good thermal insulation effect, and the uniformity and the fluidity of molten slag are improved through pre-melting treatment; the metallic aluminium not only can reduce the total iron content in the slag, but also can reduce the content of finished calcium oxide with a high oxygen content in the molten steel, so as to reduce the ratio of aluminium to calcium, and improve the capability of the molten slag in adsorbing the oxide inclusion (Al2O3) in the molten steel to purify the molten steel; and meanwhile, the high-calcium pre-molten slag modification alumina slag ball doesn't contain F<->, thereby being favorable for environmental protection and a furnace lining. Compared with the prior art, the invention has the advantage that the high-calcium pre-molten slag modification alumina slag ball is more favorable for adsorbing and removing the inclusion, reduces the oxygen content in the finished product, ensures an extremely low content of harmful impurities, is environment-friendly and cannot corrode the furnace lining.

Description

technical field [0001] The invention belongs to the technical field of pretreatment alloying of molten steel refining, and in particular relates to a high-calcium pre-melted slag modified aluminum slag ball for alloying molten steel and improving the properties of steel slag during refining treatment and a preparation method thereof. Background technique [0002] Improving the purity of steel is conducive to improving steel quality, improving steel performance and prolonging the service life of steel. It is an important development direction of steel products in the "Twelfth Five-Year Plan". The research and development of high-efficiency, low-cost, and stable production of high-clean steel production technology will be the focus of steelmaking technology development in the future. Refining is an important means to improve the purity of molten steel. In order to make the molten steel clean, it is necessary to deeply remove impurities from the molten steel. The premise of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04
Inventor 杨杰陈希来王国华许双贵谢小群朱先营
Owner 西峡县恒基冶材有限公司
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